/* [<][>][^][v][top][bottom][index][help] */
DEFINITIONS
This source file includes following definitions.
- CloneDrawInfo
- LogPolygonInfo
- ReversePoints
- ConvertPathToPolygon
- LogPathInfo
- ConvertPrimitiveToPath
- DestroyDrawInfo
- DestroyEdge
- DestroyGradientInfo
- DestroyPolygonInfo
- AffineEdge
- InverseAffineMatrix
- DrawAffineImage
- DrawBoundingRectangles
- DrawClipPath
- DrawDashPolygon
- IsPoint
- DrawImage
- DrawPatternPath
- GetPixelOpacity
- DrawPolygonPrimitive
- LogPrimitiveInfo
- DrawPrimitive
- DrawRoundLinecap
- DrawStrokePolygon
- GetDrawInfo
- Permutate
- TraceArc
- TraceArcPath
- TraceBezier
- TraceCircle
- TraceEllipse
- TraceLine
- TracePath
- TracePoint
- TraceRectangle
- TraceRoundRectangle
- TraceSquareLinecap
- TraceStrokePolygon
/*
% Copyright (C) 2003-2009 GraphicsMagick Group
% Copyright (C) 2002 ImageMagick Studio
% Copyright 1991-1999 E. I. du Pont de Nemours and Company
%
% This program is covered by multiple licenses, which are described in
% Copyright.txt. You should have received a copy of Copyright.txt with this
% package; otherwise see http://www.graphicsmagick.org/www/Copyright.html.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% RRRR EEEEE N N DDDD EEEEE RRRR %
% R R E NN N D D E R R %
% RRRR EEE N N N D D EEE RRRR %
% R R E N NN D D E R R %
% R R EEEEE N N DDDD EEEEE R R %
% %
% %
% GraphicsMagick Image Drawing Methods %
% %
% %
% Software Design %
% John Cristy %
% July 1998 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Bill Radcliffe of Corbis (www.corbis.com) contributed the polygon
% rendering code based on Paul Heckbert's "Concave Polygon Scan Conversion",
% Graphics Gems, 1990. Leonard Rosenthal and David Harr of Appligent
% (www.appligent.com) contributed the dash pattern, linecap stroking
% algorithm, and minor rendering improvements.
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/alpha_composite.h"
#include "magick/attribute.h"
#include "magick/blob.h"
#include "magick/color.h"
#include "magick/color_lookup.h"
#include "magick/constitute.h"
#include "magick/enhance.h"
#include "magick/enum_strings.h"
#include "magick/gem.h"
#include "magick/gradient.h"
#include "magick/log.h"
#include "magick/monitor.h"
#include "magick/omp_data_view.h"
#include "magick/paint.h"
#include "magick/pixel_cache.h"
#include "magick/render.h"
#include "magick/transform.h"
#include "magick/utility.h"
/*
Define declarations.
*/
#define BezierQuantum 200
/*
Typedef declarations.
*/
typedef struct _EdgeInfo
{
SegmentInfo
bounds;
double
scanline;
PointInfo
*points;
long
number_points,
direction,
ghostline,
highwater;
} EdgeInfo;
typedef struct _PolygonInfo
{
EdgeInfo
*edges;
long
number_edges;
} PolygonInfo;
typedef enum
{
MoveToCode,
OpenCode,
GhostlineCode,
LineToCode,
EndCode
} PathInfoCode;
typedef struct _PathInfo
{
PointInfo
point;
PathInfoCode
code;
} PathInfo;
/*
Forward declarations.
*/
static PrimitiveInfo
*TraceStrokePolygon(const DrawInfo *,const PrimitiveInfo *);
static MagickPassFail
DrawPrimitive(Image *,const DrawInfo *,const PrimitiveInfo *),
DrawStrokePolygon(Image *,const DrawInfo *,const PrimitiveInfo *);
static unsigned long
TracePath(PrimitiveInfo *,const char *);
static void
#if 0
DestroyGradientInfo(GradientInfo *),
#endif
TraceArc(PrimitiveInfo *,const PointInfo,const PointInfo,const PointInfo),
TraceArcPath(PrimitiveInfo *,const PointInfo,const PointInfo,const PointInfo,
const double,const unsigned int,const unsigned int),
TraceBezier(PrimitiveInfo *,const unsigned long),
TraceCircle(PrimitiveInfo *,const PointInfo,const PointInfo),
TraceEllipse(PrimitiveInfo *,const PointInfo,const PointInfo,const PointInfo),
TraceLine(PrimitiveInfo *,const PointInfo,const PointInfo),
TracePoint(PrimitiveInfo *,const PointInfo),
TraceRectangle(PrimitiveInfo *,const PointInfo,const PointInfo),
TraceRoundRectangle(PrimitiveInfo *,const PointInfo,const PointInfo,
PointInfo),
TraceSquareLinecap(PrimitiveInfo *,const unsigned long,const double);
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% C l o n e D r a w I n f o %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% CloneDrawInfo() makes a copy of the given draw info structure. If NULL
% is specified, a new image info structure is created initialized to
% default values.
%
% The format of the CloneDrawInfo method is:
%
% DrawInfo *CloneDrawInfo(const ImageInfo *image_info,
% const DrawInfo *draw_info)
%
% A description of each parameter follows:
%
% o image_info: The image info.
%
% o draw_info: The draw info.
%
%
*/
MagickExport DrawInfo *CloneDrawInfo(const ImageInfo *image_info,
const DrawInfo *draw_info)
{
DrawInfo
*clone_info;
clone_info=MagickAllocateMemory(DrawInfo *,sizeof(DrawInfo));
if (clone_info == (DrawInfo *) NULL)
MagickFatalError3(ResourceLimitFatalError,MemoryAllocationFailed,
UnableToAllocateDrawInfo);
GetDrawInfo(image_info,clone_info);
if (draw_info == (DrawInfo *) NULL)
return(clone_info);
clone_info->primitive=(char *) NULL;
if (draw_info->geometry != (char *) NULL)
clone_info->geometry=AllocateString(draw_info->geometry);
clone_info->affine=draw_info->affine;
clone_info->gravity=draw_info->gravity;
clone_info->fill=draw_info->fill;
clone_info->stroke=draw_info->stroke;
clone_info->stroke_width=draw_info->stroke_width;
if (draw_info->fill_pattern != (Image *) NULL)
clone_info->fill_pattern=CloneImage(draw_info->fill_pattern,0,0,True,
&draw_info->fill_pattern->exception);
else
if (draw_info->tile != (Image *) NULL)
clone_info->fill_pattern=CloneImage(draw_info->tile,0,0,True,
&draw_info->tile->exception);
clone_info->tile=(Image *) NULL; /* tile is deprecated */
if (draw_info->stroke_pattern != (Image *) NULL)
clone_info->stroke_pattern=CloneImage(draw_info->stroke_pattern,0,0,True,
&draw_info->stroke_pattern->exception);
clone_info->stroke_antialias=draw_info->stroke_antialias;
clone_info->text_antialias=draw_info->text_antialias;
clone_info->fill_rule=draw_info->fill_rule;
clone_info->linecap=draw_info->linecap;
clone_info->linejoin=draw_info->linejoin;
clone_info->miterlimit=draw_info->miterlimit;
clone_info->dash_offset=draw_info->dash_offset;
clone_info->decorate=draw_info->decorate;
clone_info->compose=draw_info->compose;
if (draw_info->text != (char *) NULL)
clone_info->text=AllocateString(draw_info->text);
if (draw_info->font != (char *) NULL)
(void) CloneString(&clone_info->font,draw_info->font);
if (draw_info->family != (char *) NULL)
clone_info->family=AllocateString(draw_info->family);
clone_info->style=draw_info->style;
clone_info->stretch=draw_info->stretch;
clone_info->weight=draw_info->weight;
if (draw_info->encoding != (char *) NULL)
clone_info->encoding=AllocateString(draw_info->encoding);
clone_info->pointsize=draw_info->pointsize;
if (draw_info->density != (char *) NULL)
(void) CloneString(&clone_info->density,draw_info->density);
clone_info->align=draw_info->align;
clone_info->undercolor=draw_info->undercolor;
clone_info->border_color=draw_info->border_color;
if (draw_info->server_name != (char *) NULL)
(void) CloneString(&clone_info->server_name,draw_info->server_name);
if (draw_info->dash_pattern != (double *) NULL)
{
register long
x;
for (x=0; draw_info->dash_pattern[x] != 0.0; x++);
clone_info->dash_pattern=
MagickAllocateArray(double *,(x+1),sizeof(double));
if (clone_info->dash_pattern == (double *) NULL)
MagickFatalError3(ResourceLimitFatalError,MemoryAllocationFailed,
UnableToAllocateDashPattern);
(void) memcpy(clone_info->dash_pattern,draw_info->dash_pattern,
(x+1)*sizeof(double));
}
if (draw_info->clip_path != (char *) NULL)
clone_info->clip_path=AllocateString(draw_info->clip_path);
clone_info->bounds=draw_info->bounds;
clone_info->clip_units=draw_info->clip_units;
clone_info->render=draw_info->render;
clone_info->opacity=draw_info->opacity;
clone_info->element_reference=draw_info->element_reference;
return(clone_info);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ C o n v e r t P a t h T o P o l y g o n %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method ConvertPathToPolygon converts a path to the more efficient sorted
% rendering form.
%
% The format of the ConvertPathToPolygon method is:
%
% PolygonInfo *ConvertPathToPolygon(const DrawInfo *draw_info,
% const PathInfo *path_info)
%
% A description of each parameter follows:
%
% o Method ConvertPathToPolygon returns the path in a more efficient sorted
% rendering form of type PolygonInfo.
%
% o draw_info: Specifies a pointer to an DrawInfo structure.
%
% o path_info: Specifies a pointer to an PathInfo structure.
%
%
*/
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
static int CompareEdges(const void *x,const void *y)
{
register const EdgeInfo
*p,
*q;
/*
Compare two edges.
*/
p=(EdgeInfo *) x;
q=(EdgeInfo *) y;
if ((p->points[0].y-MagickEpsilon) > q->points[0].y)
return(1);
if ((p->points[0].y+MagickEpsilon) < q->points[0].y)
return(-1);
if ((p->points[0].x-MagickEpsilon) > q->points[0].x)
return(1);
if ((p->points[0].x+MagickEpsilon) < q->points[0].x)
return(-1);
if (((p->points[1].x-p->points[0].x)*(q->points[1].y-q->points[0].y)-
(p->points[1].y-p->points[0].y)*(q->points[1].x-q->points[0].x)) > 0.0)
return(1);
return(-1);
}
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif
static void LogPolygonInfo(const PolygonInfo *polygon_info)
{
register EdgeInfo
*p;
register long
i,
j;
(void) LogMagickEvent(RenderEvent,GetMagickModule()," begin active-edge");
p=polygon_info->edges;
for (i=0; i < polygon_info->number_edges; i++)
{
(void) LogMagickEvent(RenderEvent,GetMagickModule()," edge %lu:",i);
(void) LogMagickEvent(RenderEvent,GetMagickModule()," direction: %s",
p->direction ? "down" : "up");
(void) LogMagickEvent(RenderEvent,GetMagickModule()," ghostline: %s",
p->ghostline ? "transparent" : "opaque");
(void) LogMagickEvent(RenderEvent,GetMagickModule(),
" bounds: %g,%g - %g,%g",p->bounds.x1,p->bounds.y1,p->bounds.x2,
p->bounds.y2);
for (j=0; j < p->number_points; j++)
(void) LogMagickEvent(RenderEvent,GetMagickModule()," %g,%g",
p->points[j].x,p->points[j].y);
p++;
}
(void) LogMagickEvent(RenderEvent,GetMagickModule()," end active-edge");
}
static void ReversePoints(PointInfo *points,const int number_points)
{
PointInfo
point;
register long
i;
for (i=0; i < (number_points >> 1); i++)
{
point=points[i];
points[i]=points[number_points-(i+1)];
points[number_points-(i+1)]=point;
}
}
static PolygonInfo *ConvertPathToPolygon(const PathInfo *path_info)
{
long
direction,
edge,
ghostline,
next_direction,
number_edges,
number_points;
PointInfo
point,
*points;
PolygonInfo
*polygon_info;
SegmentInfo
bounds;
register long
i,
n;
/*
Convert a path to the more efficient sorted rendering form.
*/
polygon_info=MagickAllocateMemory(PolygonInfo *,sizeof(PolygonInfo));
if (polygon_info == (PolygonInfo *) NULL)
return((PolygonInfo *) NULL);
number_edges=16;
polygon_info->edges=
MagickAllocateArray(EdgeInfo *,number_edges,sizeof(EdgeInfo));
if (polygon_info->edges == (EdgeInfo *) NULL)
return((PolygonInfo *) NULL);
direction=0;
edge=0;
ghostline=False;
n=0;
number_points=0;
points=(PointInfo *) NULL;
(void) memset(&point,0,sizeof(PointInfo));
(void) memset(&bounds,0,sizeof(SegmentInfo));
for (i=0; path_info[i].code != EndCode; i++)
{
if ((path_info[i].code == MoveToCode) || (path_info[i].code == OpenCode) ||
(path_info[i].code == GhostlineCode))
{
/*
Move to.
*/
if ((points != (PointInfo *) NULL) && (n >= 2))
{
if (edge == number_edges)
{
number_edges<<=1;
MagickReallocMemory(EdgeInfo *,polygon_info->edges,
number_edges*sizeof(EdgeInfo));
if (polygon_info->edges == (EdgeInfo *) NULL)
return((PolygonInfo *) NULL);
}
polygon_info->edges[edge].number_points=n;
polygon_info->edges[edge].scanline=(-1.0);
polygon_info->edges[edge].highwater=0;
polygon_info->edges[edge].ghostline=ghostline;
polygon_info->edges[edge].direction=direction > 0;
if (direction < 0)
ReversePoints(points,n);
polygon_info->edges[edge].points=points;
polygon_info->edges[edge].bounds=bounds;
polygon_info->edges[edge].bounds.y1=points[0].y;
polygon_info->edges[edge].bounds.y2=points[n-1].y;
points=(PointInfo *) NULL;
ghostline=False;
edge++;
}
if (points == (PointInfo *) NULL)
{
number_points=16;
points=
MagickAllocateArray(PointInfo *,number_points,sizeof(PointInfo));
if (points == (PointInfo *) NULL)
return((PolygonInfo *) NULL);
}
ghostline=path_info[i].code == GhostlineCode;
point=path_info[i].point;
points[0]=point;
bounds.x1=point.x;
bounds.x2=point.x;
direction=0;
n=1;
continue;
}
/*
Line to.
*/
next_direction=((path_info[i].point.y > point.y) ||
((path_info[i].point.y == point.y) &&
(path_info[i].point.x > point.x))) ? 1 : -1;
if (direction && (direction != next_direction))
{
/*
New edge.
*/
point=points[n-1];
if (edge == number_edges)
{
number_edges<<=1;
MagickReallocMemory(EdgeInfo *,polygon_info->edges,
number_edges*sizeof(EdgeInfo));
if (polygon_info->edges == (EdgeInfo *) NULL)
return((PolygonInfo *) NULL);
}
polygon_info->edges[edge].number_points=n;
polygon_info->edges[edge].scanline=(-1.0);
polygon_info->edges[edge].highwater=0;
polygon_info->edges[edge].ghostline=ghostline;
polygon_info->edges[edge].direction=direction > 0;
if (direction < 0)
ReversePoints(points,n);
polygon_info->edges[edge].points=points;
polygon_info->edges[edge].bounds=bounds;
polygon_info->edges[edge].bounds.y1=points[0].y;
polygon_info->edges[edge].bounds.y2=points[n-1].y;
number_points=16;
points=
MagickAllocateArray(PointInfo *,number_points,sizeof(PointInfo));
if (points == (PointInfo *) NULL)
return((PolygonInfo *) NULL);
n=1;
ghostline=False;
points[0]=point;
bounds.x1=point.x;
bounds.x2=point.x;
edge++;
}
direction=next_direction;
if (points == (PointInfo *) NULL)
continue;
if (n == number_points)
{
number_points<<=1;
MagickReallocMemory(PointInfo *,points,number_points*sizeof(PointInfo));
if (points == (PointInfo *) NULL)
return((PolygonInfo *) NULL);
}
point=path_info[i].point;
points[n]=point;
if (point.x < bounds.x1)
bounds.x1=point.x;
if (point.x > bounds.x2)
bounds.x2=point.x;
n++;
}
if (points != (PointInfo *) NULL)
{
if (n < 2)
{
MagickFreeMemory(points);
}
else
{
if (edge == number_edges)
{
number_edges<<=1;
MagickReallocMemory(EdgeInfo *,polygon_info->edges,
number_edges*sizeof(EdgeInfo));
if (polygon_info->edges == (EdgeInfo *) NULL)
return((PolygonInfo *) NULL);
}
polygon_info->edges[edge].number_points=n;
polygon_info->edges[edge].scanline=(-1.0);
polygon_info->edges[edge].highwater=0;
polygon_info->edges[edge].ghostline=ghostline;
polygon_info->edges[edge].direction=direction > 0;
if (direction < 0)
ReversePoints(points,n);
polygon_info->edges[edge].points=points;
polygon_info->edges[edge].bounds=bounds;
polygon_info->edges[edge].bounds.y1=points[0].y;
polygon_info->edges[edge].bounds.y2=points[n-1].y;
ghostline=False;
edge++;
}
}
polygon_info->number_edges=edge;
qsort(polygon_info->edges,polygon_info->number_edges,sizeof(EdgeInfo),
CompareEdges);
if (IsEventLogging())
LogPolygonInfo(polygon_info);
return(polygon_info);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ C o n v e r t P r i m i t i v e T o P a t h %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method ConvertPrimitiveToPath converts a PrimitiveInfo structure into a
% vector path structure.
%
% The format of the ConvertPrimitiveToPath method is:
%
% PathInfo *ConvertPrimitiveToPath(const DrawInfo *draw_info,
% const PrimitiveInfo *primitive_info)
%
% A description of each parameter follows:
%
% o Method ConvertPrimitiveToPath returns a vector path structure of type
% PathInfo.
%
% o draw_info: a structure of type DrawInfo.
%
% o primitive_info: Specifies a pointer to an PrimitiveInfo structure.
%
%
*/
static void LogPathInfo(const PathInfo *path_info)
{
register const PathInfo
*p;
(void) LogMagickEvent(RenderEvent,GetMagickModule()," begin vector-path");
for (p=path_info; p->code != EndCode; p++)
(void) LogMagickEvent(RenderEvent,GetMagickModule(),
" %g,%g %s",p->point.x,p->point.y,p->code == GhostlineCode ?
"moveto ghostline" : p->code == OpenCode ? "moveto open" :
p->code == MoveToCode ? "moveto" : p->code == LineToCode ? "lineto" :
"?");
(void) LogMagickEvent(RenderEvent,GetMagickModule()," end vector-path");
}
static PathInfo *ConvertPrimitiveToPath(const DrawInfo *ARGUNUSED(draw_info),
const PrimitiveInfo *primitive_info)
{
long
coordinates,
start;
PathInfo
*path_info;
PathInfoCode
code;
PointInfo
p,
q;
register long
i,
n;
/*
Converts a PrimitiveInfo structure into a vector path structure.
*/
switch (primitive_info->primitive)
{
case PointPrimitive:
case ColorPrimitive:
case MattePrimitive:
case TextPrimitive:
case ImagePrimitive:
return((PathInfo *) NULL);
default:
break;
}
for (i=0; primitive_info[i].primitive != UndefinedPrimitive; i++);
path_info=MagickAllocateArray(PathInfo *,(2*i+3),sizeof(PathInfo));
if (path_info == (PathInfo *) NULL)
return((PathInfo *) NULL);
coordinates=0;
n=0;
p.x=(-1);
p.y=(-1);
q.x=(-1);
q.y=(-1);
start=0;
for (i=0; primitive_info[i].primitive != UndefinedPrimitive; i++)
{
code=LineToCode;
if (coordinates <= 0)
{
coordinates=(long) primitive_info[i].coordinates;
p=primitive_info[i].point;
start=n;
code=MoveToCode;
}
coordinates--;
/*
Eliminate duplicate points.
*/
if ((i == 0) || (fabs(q.x-primitive_info[i].point.x) > MagickEpsilon) ||
(fabs(q.y-primitive_info[i].point.y) > MagickEpsilon))
{
path_info[n].code=code;
path_info[n].point=primitive_info[i].point;
q=primitive_info[i].point;
n++;
}
if (coordinates > 0)
continue;
if ((fabs(p.x-primitive_info[i].point.x) <= MagickEpsilon) &&
(fabs(p.y-primitive_info[i].point.y) <= MagickEpsilon))
continue;
/*
Mark the p point as open if it does not match the q.
*/
path_info[start].code=OpenCode;
path_info[n].code=GhostlineCode;
path_info[n].point=primitive_info[i].point;
n++;
path_info[n].code=LineToCode;
path_info[n].point=p;
n++;
}
path_info[n].code=EndCode;
path_info[n].point.x=0.0;
path_info[n].point.y=0.0;
if (IsEventLogging())
LogPathInfo(path_info);
return(path_info);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% D e s t r o y D r a w I n f o %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% DestroyDrawInfo() deallocates memory associated with an DrawInfo
% structure.
%
% The format of the DestroyDrawInfo method is:
%
% void DestroyDrawInfo(DrawInfo *draw_info)
%
% A description of each parameter follows:
%
% o draw_info: The draw info.
%
%
*/
MagickExport void DestroyDrawInfo(DrawInfo *draw_info)
{
assert(draw_info != (DrawInfo *) NULL);
assert(draw_info->signature == MagickSignature);
MagickFreeMemory(draw_info->primitive);
MagickFreeMemory(draw_info->text);
MagickFreeMemory(draw_info->geometry);
if (draw_info->tile != 0)
DestroyImage(draw_info->tile);
if (draw_info->fill_pattern != (Image *) NULL)
DestroyImage(draw_info->fill_pattern);
if (draw_info->stroke_pattern != (Image *) NULL)
DestroyImage(draw_info->stroke_pattern);
MagickFreeMemory(draw_info->font);
MagickFreeMemory(draw_info->family);
MagickFreeMemory(draw_info->encoding);
MagickFreeMemory(draw_info->density);
MagickFreeMemory(draw_info->server_name);
MagickFreeMemory(draw_info->dash_pattern);
MagickFreeMemory(draw_info->clip_path);
(void) memset((void *)draw_info,0xbf,sizeof(DrawInfo));
MagickFreeMemory(draw_info);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ D e s t r o y E d g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method DestroyEdge destroys the specified polygon edge.
%
% The format of the DestroyEdge method is:
%
% long DestroyEdge(PolygonInfo *polygon_info,const int edge)
%
% A description of each parameter follows:
%
% o polygon_info: Specifies a pointer to an PolygonInfo structure.
%
% o edge: the polygon edge number to destroy.
%
%
*/
static long DestroyEdge(PolygonInfo *polygon_info,const long edge)
{
assert(edge >= 0);
assert(edge < polygon_info->number_edges);
MagickFreeMemory(polygon_info->edges[edge].points);
polygon_info->number_edges--;
if (edge < polygon_info->number_edges)
(void) memmove(polygon_info->edges+edge,polygon_info->edges+edge+1,
(polygon_info->number_edges-edge)*sizeof(EdgeInfo));
return(polygon_info->number_edges);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ D e s t r o y G r a d i e n t I n f o %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% DestroyGradientInfo() deallocates memory associated with the GradientInfo
% list.
%
% The format of the DestroyGradientInfo method is:
%
% DestroyGradientInfo(GradientInfo *gradient_info)
%
% A description of each parameter follows:
%
% o gradient_info: The gradient info.
%
%
*/
#if 0
static void DestroyGradientInfo(GradientInfo *gradient_info)
{
register GradientInfo
*p;
if (gradient_info == (GradientInfo *) NULL)
return;
assert(gradient_info->signature == MagickSignature);
for (p=gradient_info; p->previous != (GradientInfo *) NULL; p=p->previous);
for (gradient_info=p; p != (GradientInfo *) NULL; gradient_info=p)
{
p=p->next;
MagickFreeMemory(gradient_info);
}
}
#endif
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ D e s t r o y P o l y g o n I n f o %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method DestroyPolygonInfo destroys the PolygonInfo data structure.
%
% The format of the DestroyPolygonInfo method is:
%
% void DestroyPolygonInfo(PolygonInfo *polygon_info)
%
% A description of each parameter follows:
%
% o polygon_info: Specifies a pointer to an PolygonInfo structure.
%
%
*/
static void DestroyPolygonInfo(void *polygon_info_void)
{
PolygonInfo
*polygon_info = (PolygonInfo *) polygon_info_void;
register long
i;
for (i=0; i < polygon_info->number_edges; i++)
MagickFreeMemory(polygon_info->edges[i].points);
MagickFreeMemory(polygon_info->edges);
MagickFreeMemory(polygon_info);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% D r a w A f f i n e I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% DrawAffineImage() composites the source over the destination image as
% dictated by the affine transform.
%
% The format of the DrawAffineImage method is:
%
% unsigned int DrawAffineImage(Image *image,const Image *composite,
% const AffineMatrix *affine)
%
% A description of each parameter follows:
%
% o image: The image.
%
% o image: The composite image.
%
% o affine: The affine transform.
%
%
*/
static SegmentInfo AffineEdge(const Image *image,const AffineMatrix *affine,
const long y,const SegmentInfo *edge)
{
double
intercept,
z;
register long
x;
SegmentInfo
inverse_edge;
/*
Determine left and right edges.
*/
inverse_edge.x1=edge->x1;
inverse_edge.y1=0;
inverse_edge.x2=edge->x2;
inverse_edge.y2=0;
z=affine->ry*(y+0.5)+affine->tx;
if (affine->sx > MagickEpsilon)
{
intercept=(-z/affine->sx);
x=(long) ceil(intercept+MagickEpsilon-0.5);
if (x > inverse_edge.x1)
inverse_edge.x1=x;
intercept=(-z+image->columns)/affine->sx;
x=(long) ceil(intercept-MagickEpsilon-0.5);
if (x < inverse_edge.x2)
inverse_edge.x2=x;
}
else
if (affine->sx < -MagickEpsilon)
{
intercept=(-z+image->columns)/affine->sx;
x=(long) ceil(intercept+MagickEpsilon-0.5);
if (x > inverse_edge.x1)
inverse_edge.x1=x;
intercept=(-z/affine->sx);
x=(long) ceil(intercept-MagickEpsilon-0.5);
if (x < inverse_edge.x2)
inverse_edge.x2=x;
}
else
if ((z < 0) || (z >= image->columns))
{
inverse_edge.x2=edge->x1;
return(inverse_edge);
}
/*
Determine top and bottom edges.
*/
z=affine->sy*(y+0.5)+affine->ty;
if (affine->rx > MagickEpsilon)
{
intercept=(-z /affine->rx);
x=(long) ceil(intercept+MagickEpsilon-0.5);
if (x > inverse_edge.x1)
inverse_edge.x1=x;
intercept=(-z+image->rows)/affine->rx;
x=(long) ceil(intercept-MagickEpsilon-0.5);
if (x < inverse_edge.x2)
inverse_edge.x2=x;
}
else
if (affine->rx < -MagickEpsilon)
{
intercept=(-z+image->rows)/affine->rx;
x=(long) ceil(intercept+MagickEpsilon-0.5);
if (x > inverse_edge.x1)
inverse_edge.x1=x;
intercept=(-z/affine->rx);
x=(long) ceil(intercept-MagickEpsilon-0.5);
if (x < inverse_edge.x2)
inverse_edge.x2=x;
}
else
if ((z < 0) || (z >= image->rows))
{
inverse_edge.x2=edge->x1;
return(inverse_edge);
}
return(inverse_edge);
}
static AffineMatrix InverseAffineMatrix(const AffineMatrix *affine)
{
AffineMatrix
inverse_affine;
double
determinant;
determinant=1.0/(affine->sx*affine->sy-affine->rx*affine->ry);
inverse_affine.sx=determinant*affine->sy;
inverse_affine.rx=determinant*(-affine->rx);
inverse_affine.ry=determinant*(-affine->ry);
inverse_affine.sy=determinant*affine->sx;
inverse_affine.tx=
(-affine->tx)*inverse_affine.sx-affine->ty*inverse_affine.ry;
inverse_affine.ty=
(-affine->tx)*inverse_affine.rx-affine->ty*inverse_affine.sy;
return(inverse_affine);
}
#define AffineDrawImageText "[%s] Affine composite..."
MagickExport MagickPassFail DrawAffineImage(Image *image,const Image *composite,
const AffineMatrix *affine)
{
MagickPassFail
status = MagickPass;
unsigned long
row_count=0;
AffineMatrix
inverse_affine;
long
y,
y_max,
y_min;
PointInfo
extent[4],
min,
max;
register long
i;
SegmentInfo
edge;
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
assert(composite != (const Image *) NULL);
assert(composite->signature == MagickSignature);
assert(affine != (AffineMatrix *) NULL);
/*
Determine bounding box.
*/
extent[0].x=0;
extent[0].y=0;
extent[1].x=composite->columns;
extent[1].y=0;
extent[2].x=composite->columns;
extent[2].y=composite->rows;
extent[3].x=0;
extent[3].y=composite->rows;
for (i=0; i < 4; i++)
{
register long
x;
x=(long) extent[i].x;
y=(long) extent[i].y;
extent[i].x=x*affine->sx+y*affine->ry+affine->tx;
extent[i].y=x*affine->rx+y*affine->sy+affine->ty;
}
min=extent[0];
max=extent[0];
for (i=1; i < 4; i++)
{
if (min.x > extent[i].x)
min.x=extent[i].x;
if (min.y > extent[i].y)
min.y=extent[i].y;
if (max.x < extent[i].x)
max.x=extent[i].x;
if (max.y < extent[i].y)
max.y=extent[i].y;
}
/*
Affine transform image.
*/
(void) SetImageType(image,TrueColorType);
edge.x1=min.x;
edge.y1=min.y;
edge.x2=max.x;
edge.y2=max.y;
inverse_affine=InverseAffineMatrix(affine);
if (edge.y1 < 0)
edge.y1=0.0;
if (edge.y2 >= image->rows)
edge.y2=image->rows-1;
y_min=(long) ceil(edge.y1-0.5);
y_max=(long) floor(edge.y2+0.5);
#if defined(HAVE_OPENMP)
# pragma omp parallel for schedule(dynamic) shared(row_count, status)
#endif
for (y=y_min; y <= y_max; y++)
{
MagickBool
thread_status;
long
start,
stop;
SegmentInfo
inverse_edge;
register PixelPacket
*q;
register long
x;
thread_status=status;
if (thread_status == MagickFail)
continue;
inverse_edge=AffineEdge(composite,&inverse_affine,y,&edge);
if (inverse_edge.x2 < inverse_edge.x1)
continue;
if (inverse_edge.x1 < 0)
inverse_edge.x1=0.0;
if (inverse_edge.x2 >= image->columns)
inverse_edge.x2=image->columns-1;
start=(long) ceil(inverse_edge.x1-0.5);
stop=(long) floor(inverse_edge.x2+0.5);
x=start;
q=GetImagePixelsEx(image,x,y,stop-x+1,1,&image->exception);
if (q == (PixelPacket *) NULL)
thread_status=MagickFail;
if (thread_status != MagickFail)
{
for ( ; x <= stop; x++)
{
PointInfo
point;
PixelPacket
pixel;
point.x=x*inverse_affine.sx+y*inverse_affine.ry+inverse_affine.tx;
point.y=x*inverse_affine.rx+y*inverse_affine.sy+inverse_affine.ty;
/*
FIXME: Point sampling is a rather crude implementation
for an affine transform. We achieve more accurate
point sampling by using InterpolateViewColor() to
evalute a bi-linear interpolated point rather than
obtaining a pixel value from a close pixel.
*/
#if 1
InterpolateViewColor(AccessDefaultCacheView(composite),&pixel,
point.x,
point.y,
&image->exception);
#else
(void) AcquireOnePixelByReference(composite,&pixel,(long) point.x,
(long) point.y,&image->exception);
#endif
if (!composite->matte)
pixel.opacity=OpaqueOpacity;
AlphaCompositePixel(q,&pixel,pixel.opacity,q,q->opacity);
q++;
}
if (!SyncImagePixelsEx(image,&image->exception))
thread_status=MagickFail;
}
#if defined(HAVE_OPENMP)
# pragma omp critical (GM_DrawAffineImage)
#endif
{
row_count++;
if (QuantumTick(row_count,y_max-y_min+1))
if (!MagickMonitorFormatted(row_count,y_max-y_min+1,&image->exception,
AffineDrawImageText,image->filename))
thread_status=MagickFail;
if (thread_status == MagickFail)
status=MagickFail;
}
}
return (status);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ D r a w B o u n d i n g R e c t a n g l e s %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method DrawBoundingRectangles draws the bounding rectangles on the image.
% This is only useful for developers debugging the rendering algorithm.
%
% The format of the DrawBoundingRectangles method is:
%
% void DrawBoundingRectangles(Image *image,const DrawInfo *draw_info,
% PolygonInfo *polygon_info)
%
% A description of each parameter follows:
%
% o image: The image.
%
% o draw_info: The draw info.
%
% o polygon_info: Specifies a pointer to a PolygonInfo structure.
%
%
*/
static void DrawBoundingRectangles(Image *image,const DrawInfo *draw_info,
const PolygonInfo *polygon_info)
{
double
mid;
DrawInfo
*clone_info;
long
coordinates;
PointInfo
end,
resolution,
start;
PrimitiveInfo
primitive_info[6];
register long
i;
SegmentInfo
bounds;
clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
(void) QueryColorDatabase("#000000ff",&clone_info->fill,&image->exception);
resolution.x=72.0;
resolution.y=72.0;
if (clone_info->density != (char *) NULL)
{
int
count;
count=GetMagickDimension(clone_info->density,&resolution.x,&resolution.y,NULL,NULL);
if (count != 2)
resolution.y=resolution.x;
}
mid=(resolution.x/72.0)*ExpandAffine(&clone_info->affine)*
clone_info->stroke_width/2.0;
if (polygon_info != (PolygonInfo *) NULL)
{
bounds=polygon_info->edges[0].bounds;
for (i=1; i < polygon_info->number_edges; i++)
{
if (polygon_info->edges[i].bounds.x1 < bounds.x1)
bounds.x1=polygon_info->edges[i].bounds.x1;
if (polygon_info->edges[i].bounds.y1 < bounds.y1)
bounds.y1=polygon_info->edges[i].bounds.y1;
if (polygon_info->edges[i].bounds.x2 > bounds.x2)
bounds.x2=polygon_info->edges[i].bounds.x2;
if (polygon_info->edges[i].bounds.y2 > bounds.y2)
bounds.y2=polygon_info->edges[i].bounds.y2;
}
bounds.x1-=mid;
bounds.x1=bounds.x1 < 0.0 ? 0.0 :
bounds.x1 >= image->columns ? image->columns-1 : bounds.x1;
bounds.y1-=mid;
bounds.y1=bounds.y1 < 0.0 ? 0.0 :
bounds.y1 >= image->rows ? image->rows-1 : bounds.y1;
bounds.x2+=mid;
bounds.x2=bounds.x2 < 0.0 ? 0.0 :
bounds.x2 >= image->columns ? image->columns-1 : bounds.x2;
bounds.y2+=mid;
bounds.y2=bounds.y2 < 0.0 ? 0.0 :
bounds.y2 >= image->rows ? image->rows-1 : bounds.y2;
for (i=0; i < polygon_info->number_edges; i++)
{
if (polygon_info->edges[i].direction)
(void) QueryColorDatabase("red",&clone_info->stroke,
&image->exception);
else
(void) QueryColorDatabase("green",&clone_info->stroke,
&image->exception);
start.x=polygon_info->edges[i].bounds.x1-mid;
start.y=polygon_info->edges[i].bounds.y1-mid;
end.x=polygon_info->edges[i].bounds.x2+mid;
end.y=polygon_info->edges[i].bounds.y2+mid;
primitive_info[0].primitive=RectanglePrimitive;
TraceRectangle(primitive_info,start,end);
primitive_info[0].method=ReplaceMethod;
coordinates=(long) primitive_info[0].coordinates;
primitive_info[coordinates].primitive=UndefinedPrimitive;
(void) DrawPrimitive(image,clone_info,primitive_info);
}
}
(void) QueryColorDatabase("blue",&clone_info->stroke,&image->exception);
start.x=bounds.x1-mid;
start.y=bounds.y1-mid;
end.x=bounds.x2+mid;
end.y=bounds.y2+mid;
primitive_info[0].primitive=RectanglePrimitive;
TraceRectangle(primitive_info,start,end);
primitive_info[0].method=ReplaceMethod;
coordinates=(long) primitive_info[0].coordinates;
primitive_info[coordinates].primitive=UndefinedPrimitive;
(void) DrawPrimitive(image,clone_info,primitive_info);
DestroyDrawInfo(clone_info);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% D r a w C l i p P a t h %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% DrawClipPath() draws the clip path on the image mask.
%
% The format of the DrawClipPath method is:
%
% unsigned int DrawClipPath(Image *image,const DrawInfo *draw_info,
% const char *name)
%
% A description of each parameter follows:
%
% o image: The image.
%
% o draw_info: The draw info.
%
% o name: The name of the clip path.
%
%
*/
MagickExport unsigned int DrawClipPath(Image *image,const DrawInfo *draw_info,
const char *name)
{
char
clip_path[MaxTextExtent];
const ImageAttribute
*attribute;
DrawInfo
*clone_info;
unsigned int
status;
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
assert(draw_info != (const DrawInfo *) NULL);
FormatString(clip_path,"[%.1024s]",name);
attribute=GetImageAttribute(image,clip_path);
if (attribute == (ImageAttribute *) NULL)
return(False);
if (image->clip_mask == (Image *) NULL)
{
Image
*clip_mask;
clip_mask=CloneImage(image,image->columns,image->rows,True,
&image->exception);
if (clip_mask == (Image *) NULL)
return(False);
(void) SetImageClipMask(image,clip_mask);
DestroyImage(clip_mask);
}
(void) QueryColorDatabase("none",&image->clip_mask->background_color,
&image->exception);
(void) SetImage(image->clip_mask,TransparentOpacity);
(void) LogMagickEvent(RenderEvent,GetMagickModule(),
"\nbegin clip-path %.1024s",draw_info->clip_path);
clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
(void) CloneString(&clone_info->primitive,attribute->value);
(void) QueryColorDatabase("white",&clone_info->fill,&image->exception);
MagickFreeMemory(clone_info->clip_path);
status=DrawImage(image->clip_mask,clone_info);
(void) NegateImage(image->clip_mask,False);
DestroyDrawInfo(clone_info);
(void) LogMagickEvent(RenderEvent,GetMagickModule(),"end clip-path");
return(status);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ D r a w D a s h P o l y g o n %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method DrawDashPolygon draws a dashed polygon (line, rectangle, ellipse)
% on the image while respecting the dash offset and dash pattern attributes.
%
% The format of the DrawDashPolygon method is:
%
% unsigned int DrawDashPolygon(const DrawInfo *draw_info,
% const PrimitiveInfo *primitive_info,Image *image)
%
% A description of each parameter follows:
%
% o draw_info: The draw info.
%
% o primitive_info: Specifies a pointer to a PrimitiveInfo structure.
%
% o image: The image.
%
%
*/
static unsigned int DrawDashPolygon(const DrawInfo *draw_info,
const PrimitiveInfo *primitive_info,Image *image)
{
double
length,
maximum_length,
offset,
scale,
total_length;
DrawInfo
*clone_info;
int
j,
n,
number_vertices;
PrimitiveInfo
*dash_polygon;
register double
dx,
dy;
register long
i;
unsigned int
status;
assert(draw_info != (const DrawInfo *) NULL);
(void) LogMagickEvent(RenderEvent,GetMagickModule()," begin draw-dash");
clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
clone_info->miterlimit=0;
for (i=0; primitive_info[i].primitive != UndefinedPrimitive; i++);
number_vertices=i;
dash_polygon=MagickAllocateArray(PrimitiveInfo *,
(size_t) 2*number_vertices+1,
sizeof(PrimitiveInfo));
if (dash_polygon == (PrimitiveInfo *) NULL)
return(False);
dash_polygon[0]=primitive_info[0];
scale=ExpandAffine(&draw_info->affine);
length=scale*draw_info->dash_pattern[0];
offset=draw_info->dash_offset != 0.0 ? scale*draw_info->dash_offset : 0.0;
j=1;
for (n=0; offset > 0.0; j=0)
{
if (draw_info->dash_pattern[n] <= 0.0)
break;
length=scale*draw_info->dash_pattern[n];
if (offset > length)
{
offset-=length;
n++;
length=scale*draw_info->dash_pattern[n];
continue;
}
if (offset < length)
{
length-=offset;
offset=0.0;
break;
}
offset=0.0;
n++;
}
status=True;
for (i=1; i < number_vertices; i++)
{
dx=primitive_info[i].point.x-primitive_info[i-1].point.x;
dy=primitive_info[i].point.y-primitive_info[i-1].point.y;
maximum_length=sqrt(dx*dx+dy*dy+MagickEpsilon);
if (length == 0)
{
n++;
if (draw_info->dash_pattern[n] == 0.0)
n=0;
length=scale*draw_info->dash_pattern[n];
}
for (total_length=0.0; maximum_length >= (length+total_length); )
{
total_length+=length;
if (n & 0x01)
{
dash_polygon[0]=primitive_info[0];
dash_polygon[0].point.x=primitive_info[i-1].point.x+
dx*total_length/maximum_length;
dash_polygon[0].point.y=primitive_info[i-1].point.y+
dy*total_length/maximum_length;
j=1;
}
else
{
if (j+1 > number_vertices)
break;
dash_polygon[j]=primitive_info[i-1];
dash_polygon[j].point.x=primitive_info[i-1].point.x+
dx*total_length/maximum_length;
dash_polygon[j].point.y=primitive_info[i-1].point.y+
dy*total_length/maximum_length;
dash_polygon[j].coordinates=1;
j++;
dash_polygon[0].coordinates=j;
dash_polygon[j].primitive=UndefinedPrimitive;
status|=DrawStrokePolygon(image,clone_info,dash_polygon);
}
n++;
if (draw_info->dash_pattern[n] == 0.0)
n=0;
length=scale*draw_info->dash_pattern[n];
}
length-=(maximum_length-total_length);
if (n & 0x01)
continue;
dash_polygon[j]=primitive_info[i];
dash_polygon[j].coordinates=1;
j++;
}
MagickFreeMemory(dash_polygon);
DestroyDrawInfo(clone_info);
(void) LogMagickEvent(RenderEvent,GetMagickModule()," end draw-dash");
return(status);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% D r a w I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Use DrawImage() to draw a graphic primitive on your image. The primitive
% may be represented as a string or filename. Precede the filename with an
% "at" sign (@) and the contents of the file are drawn on the image. You
% can affect how text is drawn by setting one or more members of the draw
% info structure.
%
% Note that this is a legacy interface. Authors of new code should consider
% using the Draw* methods defined by magick/draw.h since they are better
% documented and less error prone.
%
% The format of the DrawImage method is:
%
% unsigned int DrawImage(Image *image,const DrawInfo *draw_info)
%
% A description of each parameter follows:
%
% o image: The image.
%
% o draw_info: The draw info.
%
%
*/
static inline unsigned int IsPoint(const char *point)
{
char
*p;
(void) strtol(point,&p,10);
return(p != point);
}
MagickExport unsigned int DrawImage(Image *image,const DrawInfo *draw_info)
{
#define RenderImageText "[%s] Render..."
AffineMatrix
affine,
current;
char
key[2*MaxTextExtent],
keyword[MaxTextExtent],
geometry[MaxTextExtent],
name[MaxTextExtent],
pattern[MaxTextExtent],
*primitive,
*q,
*token;
double
alpha,
beta,
angle,
factor,
primitive_extent,
radius;
DrawInfo
**graphic_context;
long
j,
k,
n;
PointInfo
point;
PixelPacket
start_color;
PrimitiveInfo
*primitive_info;
PrimitiveType
primitive_type;
register char
*p;
register long
i,
x;
SegmentInfo
bounds;
size_t
length;
unsigned int
status;
unsigned long
number_points;
/*
Ensure the annotation info is valid.
*/
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
assert(draw_info != (DrawInfo *) NULL);
assert(draw_info->signature == MagickSignature);
assert(draw_info->primitive != (char *) NULL);
if (*draw_info->primitive == '\0')
return(False);
(void) LogMagickEvent(RenderEvent,GetMagickModule(),"begin draw-image");
if (*draw_info->primitive != '@')
primitive=AllocateString(draw_info->primitive);
else
primitive=(char *)
FileToBlob(draw_info->primitive+1,&length,&image->exception);
if (primitive == (char *) NULL)
return(False);
primitive_extent=strlen(primitive);
(void) SetImageAttribute(image,"[MVG]",primitive);
n=0;
/*
Allocate primitive info memory.
*/
graphic_context=MagickAllocateMemory(DrawInfo **,sizeof(DrawInfo *));
if (graphic_context == (DrawInfo **) NULL)
{
MagickFreeMemory(primitive);
ThrowBinaryException3(ResourceLimitError,MemoryAllocationFailed,
UnableToDrawOnImage)
}
number_points=2047;
primitive_info=
MagickAllocateArray(PrimitiveInfo *,number_points,sizeof(PrimitiveInfo));
if (primitive_info == (PrimitiveInfo *) NULL)
{
MagickFreeMemory(primitive);
for ( ; n >= 0; n--)
DestroyDrawInfo(graphic_context[n]);
MagickFreeMemory(graphic_context);
ThrowBinaryException3(ResourceLimitError,MemoryAllocationFailed,
UnableToDrawOnImage)
}
graphic_context[n]=CloneDrawInfo((ImageInfo *) NULL,draw_info);
token=AllocateString(primitive);
(void) QueryColorDatabase("black",&start_color,&image->exception);
(void) SetImageType(image,TrueColorType);
status=True;
for (q=primitive; *q != '\0'; )
{
/*
Interpret graphic primitive.
*/
GetToken(q,&q,keyword);
if (*keyword == '\0')
break;
if (*keyword == '#')
{
/*
Comment.
*/
while ((*q != '\n') && (*q != '\0'))
q++;
continue;
}
p=q-strlen(keyword);
primitive_type=UndefinedPrimitive;
current=graphic_context[n]->affine;
IdentityAffine(&affine);
switch (*keyword)
{
case ';':
break;
case 'a':
case 'A':
{
if (LocaleCompare("affine",keyword) == 0)
{
GetToken(q,&q,token);
affine.sx=MagickAtoF(token);
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
affine.rx=MagickAtoF(token);
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
affine.ry=MagickAtoF(token);
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
affine.sy=MagickAtoF(token);
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
affine.tx=MagickAtoF(token);
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
affine.ty=MagickAtoF(token);
break;
}
if (LocaleCompare("arc",keyword) == 0)
{
primitive_type=ArcPrimitive;
break;
}
status=False;
break;
}
case 'b':
case 'B':
{
if (LocaleCompare("bezier",keyword) == 0)
{
primitive_type=BezierPrimitive;
break;
}
status=False;
break;
}
case 'c':
case 'C':
{
if (LocaleCompare("clip-path",keyword) == 0)
{
/*
Create clip mask.
*/
GetToken(q,&q,token);
(void) CloneString(&graphic_context[n]->clip_path,token);
(void) DrawClipPath(image,graphic_context[n],
graphic_context[n]->clip_path);
break;
}
if (LocaleCompare("clip-rule",keyword) == 0)
{
GetToken(q,&q,token);
if (LocaleCompare("evenodd",token) == 0)
{
graphic_context[n]->fill_rule=EvenOddRule;
break;
}
if (LocaleCompare("nonzero",token) == 0)
{
graphic_context[n]->fill_rule=NonZeroRule;
break;
}
status=False;
break;
}
if (LocaleCompare("clip-units",keyword) == 0)
{
GetToken(q,&q,token);
if (LocaleCompare("userSpace",token) == 0)
{
graphic_context[n]->clip_units=UserSpace;
break;
}
if (LocaleCompare("userSpaceOnUse",token) == 0)
{
graphic_context[n]->clip_units=UserSpaceOnUse;
break;
}
if (LocaleCompare("objectBoundingBox",token) == 0)
{
graphic_context[n]->clip_units=ObjectBoundingBox;
IdentityAffine(¤t);
affine.sx=draw_info->bounds.x2;
affine.sy=draw_info->bounds.y2;
affine.tx=draw_info->bounds.x1;
affine.ty=draw_info->bounds.y1;
break;
}
status=False;
break;
}
if (LocaleCompare("circle",keyword) == 0)
{
primitive_type=CirclePrimitive;
break;
}
if (LocaleCompare("color",keyword) == 0)
{
primitive_type=ColorPrimitive;
break;
}
status=False;
break;
}
case 'd':
case 'D':
{
if (LocaleCompare("decorate",keyword) == 0)
{
GetToken(q,&q,token);
if (LocaleCompare("underline",token) == 0)
{
graphic_context[n]->decorate=UnderlineDecoration;
break;
}
if (LocaleCompare("overline",token) == 0)
{
graphic_context[n]->decorate=OverlineDecoration;
break;
}
if (LocaleCompare("line-through",token) == 0)
{
graphic_context[n]->decorate=LineThroughDecoration;
break;
}
status=False;
break;
}
status=False;
break;
}
case 'e':
case 'E':
{
if (LocaleCompare("ellipse",keyword) == 0)
{
primitive_type=EllipsePrimitive;
break;
}
if (LocaleCompare("encoding",keyword) == 0)
{
GetToken(q,&q,token);
(void) CloneString(&graphic_context[n]->encoding,token);
break;
}
status=False;
break;
}
case 'f':
case 'F':
{
if (LocaleCompare("fill",keyword) == 0)
{
GetToken(q,&q,token);
FormatString(pattern,"[%.1024s]",token);
if (GetImageAttribute(image,pattern) == (ImageAttribute *) NULL)
(void) QueryColorDatabase(token,&graphic_context[n]->fill,
&image->exception);
else
(void) DrawPatternPath(image,draw_info,token,
&graphic_context[n]->fill_pattern);
if (graphic_context[n]->fill.opacity != TransparentOpacity)
graphic_context[n]->fill.opacity=graphic_context[n]->opacity;
break;
}
if (LocaleCompare("fill-rule",keyword) == 0)
{
GetToken(q,&q,token);
if (LocaleCompare("evenodd",token) == 0)
{
graphic_context[n]->fill_rule=EvenOddRule;
break;
}
if (LocaleCompare("nonzero",token) == 0)
{
graphic_context[n]->fill_rule=NonZeroRule;
break;
}
status=False;
break;
}
if (LocaleCompare("fill-opacity",keyword) == 0)
{
GetToken(q,&q,token);
factor=strchr(token,'%') != (char *) NULL ? 0.01 : 1.0;
if (graphic_context[n]->fill.opacity != TransparentOpacity)
graphic_context[n]->fill.opacity=(Quantum)
((double) MaxRGB*(1.0-factor*MagickAtoF(token)));
break;
}
if (LocaleCompare("font",keyword) == 0)
{
GetToken(q,&q,token);
(void) CloneString(&graphic_context[n]->font,token);
if (LocaleCompare("none",token) == 0)
MagickFreeMemory(graphic_context[n]->font);
break;
}
if (LocaleCompare("font-family",keyword) == 0)
{
GetToken(q,&q,token);
(void) CloneString(&graphic_context[n]->family,token);
break;
}
if (LocaleCompare("font-size",keyword) == 0)
{
GetToken(q,&q,token);
graphic_context[n]->pointsize=MagickAtoF(token);
break;
}
if (LocaleCompare("font-stretch",keyword) == 0)
{
GetToken(q,&q,token);
if (LocaleCompare(token,"all") == 0)
graphic_context[n]->stretch=AnyStretch;
if (LocaleCompare(token,"condensed") == 0)
graphic_context[n]->stretch=CondensedStretch;
if (LocaleCompare(token,"expanded") == 0)
graphic_context[n]->stretch=ExpandedStretch;
if (LocaleCompare(token,"extra-condensed") == 0)
graphic_context[n]->stretch=ExtraCondensedStretch;
if (LocaleCompare(token,"extra-expanded") == 0)
graphic_context[n]->stretch=ExtraExpandedStretch;
if (LocaleCompare(token,"normal") == 0)
graphic_context[n]->stretch=NormalStretch;
if (LocaleCompare(token,"semi-condensed") == 0)
graphic_context[n]->stretch=SemiCondensedStretch;
if (LocaleCompare(token,"semi-expanded") == 0)
graphic_context[n]->stretch=SemiExpandedStretch;
if (LocaleCompare(token,"ultra-condensed") == 0)
graphic_context[n]->stretch=UltraCondensedStretch;
if (LocaleCompare(token,"ultra-expanded") == 0)
graphic_context[n]->stretch=UltraExpandedStretch;
break;
}
if (LocaleCompare("font-style",keyword) == 0)
{
GetToken(q,&q,token);
if (LocaleCompare(token,"all") == 0)
graphic_context[n]->style=AnyStyle;
if (LocaleCompare(token,"italic") == 0)
graphic_context[n]->style=ItalicStyle;
if (LocaleCompare(token,"normal") == 0)
graphic_context[n]->style=NormalStyle;
if (LocaleCompare(token,"oblique") == 0)
graphic_context[n]->style=ObliqueStyle;
break;
}
if (LocaleCompare("font-weight",keyword) == 0)
{
GetToken(q,&q,token);
graphic_context[n]->weight=MagickAtoL(token);
if (LocaleCompare(token,"all") == 0)
graphic_context[n]->weight=0;
if (LocaleCompare(token,"bold") == 0)
graphic_context[n]->weight=700;
if (LocaleCompare(token,"bolder") == 0)
if (graphic_context[n]->weight <= 800)
graphic_context[n]->weight+=100;
if (LocaleCompare(token,"lighter") == 0)
if (graphic_context[n]->weight >= 100)
graphic_context[n]->weight-=100;
if (LocaleCompare(token,"normal") == 0)
graphic_context[n]->weight=400;
break;
}
status=False;
break;
}
case 'g':
case 'G':
{
if (LocaleCompare("gradient-units",keyword) == 0)
{
GetToken(q,&q,token);
break;
}
if (LocaleCompare("gravity",keyword) == 0)
{
GetToken(q,&q,token);
if (LocaleCompare("NorthWest",token) == 0)
{
graphic_context[n]->gravity=NorthWestGravity;
break;
}
if (LocaleCompare("North",token) == 0)
{
graphic_context[n]->gravity=NorthGravity;
break;
}
if (LocaleCompare("NorthEast",token) == 0)
{
graphic_context[n]->gravity=NorthEastGravity;
break;
}
if (LocaleCompare("West",token) == 0)
{
graphic_context[n]->gravity=WestGravity;
break;
}
if (LocaleCompare("Center",token) == 0)
{
graphic_context[n]->gravity=CenterGravity;
break;
}
if (LocaleCompare("East",token) == 0)
{
graphic_context[n]->gravity=EastGravity;
break;
}
if (LocaleCompare("SouthWest",token) == 0)
{
graphic_context[n]->gravity=SouthWestGravity;
break;
}
if (LocaleCompare("South",token) == 0)
{
graphic_context[n]->gravity=SouthGravity;
break;
}
if (LocaleCompare("SouthEast",token) == 0)
{
graphic_context[n]->gravity=SouthEastGravity;
break;
}
status=False;
break;
}
status=False;
break;
}
case 'i':
case 'I':
{
if (LocaleCompare("image",keyword) == 0)
{
primitive_type=ImagePrimitive;
GetToken(q,&q,token);
graphic_context[n]->compose=StringToCompositeOperator(token);
if (UndefinedCompositeOp == graphic_context[n]->compose)
status=False;
break;
}
status=False;
break;
}
case 'l':
case 'L':
{
if (LocaleCompare("line",keyword) == 0)
{
primitive_type=LinePrimitive;
break;
}
status=False;
break;
}
case 'm':
case 'M':
{
if (LocaleCompare("matte",keyword) == 0)
{
primitive_type=MattePrimitive;
break;
}
status=False;
break;
}
case 'o':
case 'O':
{
if (LocaleCompare("offset",keyword) == 0)
{
GetToken(q,&q,token);
break;
}
if (LocaleCompare("opacity",keyword) == 0)
{
GetToken(q,&q,token);
factor=strchr(token,'%') != (char *) NULL ? 0.01 : 1.0;
graphic_context[n]->opacity=(Quantum) ((double) MaxRGB*(1.0-((1.0-
graphic_context[n]->opacity/MaxRGB)*factor*MagickAtoF(token)))+0.5);
graphic_context[n]->fill.opacity=graphic_context[n]->opacity;
graphic_context[n]->stroke.opacity=graphic_context[n]->opacity;
break;
}
status=False;
break;
}
case 'p':
case 'P':
{
if (LocaleCompare("path",keyword) == 0)
{
primitive_type=PathPrimitive;
break;
}
if (LocaleCompare("point",keyword) == 0)
{
primitive_type=PointPrimitive;
break;
}
if (LocaleCompare("polyline",keyword) == 0)
{
primitive_type=PolylinePrimitive;
break;
}
if (LocaleCompare("polygon",keyword) == 0)
{
primitive_type=PolygonPrimitive;
break;
}
if (LocaleCompare("pop",keyword) == 0)
{
GetToken(q,&q,token);
if (LocaleCompare("clip-path",token) == 0)
break;
if (LocaleCompare("defs",token) == 0)
break;
if (LocaleCompare("gradient",token) == 0)
break;
if (LocaleCompare("graphic-context",token) == 0)
{
if (n == 0)
{
ThrowException(&image->exception,DrawError,UnbalancedGraphicContextPushPop,token);
break;
}
if (graphic_context[n]->clip_path != (char *) NULL)
if (LocaleCompare(graphic_context[n]->clip_path,
graphic_context[n-1]->clip_path) != 0)
(void) SetImageClipMask(image,(Image *) NULL);
DestroyDrawInfo(graphic_context[n]);
n--;
break;
}
if (LocaleCompare("pattern",token) == 0)
break;
status=False;
break;
}
if (LocaleCompare("push",keyword) == 0)
{
GetToken(q,&q,token);
if (LocaleCompare("clip-path",token) == 0)
{
char
name[MaxTextExtent];
GetToken(q,&q,token);
FormatString(name,"[%.1024s]",token);
for (p=q; *q != '\0'; )
{
GetToken(q,&q,token);
if (LocaleCompare(token,"pop") != 0)
continue;
GetToken(q,(char **) NULL,token);
if (LocaleCompare(token,"clip-path") != 0)
continue;
break;
}
(void) strncpy(token,p,q-p-4);
token[q-p-4]='\0';
(void) SetImageAttribute(image,name,token);
GetToken(q,&q,token);
break;
}
if (LocaleCompare("gradient",token) == 0)
{
char
key[2*MaxTextExtent],
name[MaxTextExtent],
type[MaxTextExtent];
/* ElementInfo */
/* element; */
SegmentInfo
segment;
GetToken(q,&q,token);
(void) strlcpy(name,token,MaxTextExtent);
GetToken(q,&q,token);
(void) strlcpy(type,token,MaxTextExtent);
GetToken(q,&q,token);
segment.x1=MagickAtoF(token);
/* element.cx=MagickAtoF(token); */
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
segment.y1=MagickAtoF(token);
/* element.cy=MagickAtoF(token); */
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
segment.x2=MagickAtoF(token);
/* element.major=MagickAtoF(token); */
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
segment.y2=MagickAtoF(token);
/* element.minor=MagickAtoF(token); */
if (LocaleCompare(type,"radial") == 0)
{
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
/* element.angle=MagickAtoF(token); */
}
for (p=q; *q != '\0'; )
{
GetToken(q,&q,token);
if (LocaleCompare(token,"pop") != 0)
continue;
GetToken(q,(char **) NULL,token);
if (LocaleCompare(token,"gradient") != 0)
continue;
break;
}
(void) strncpy(token,p,q-p-4);
token[q-p-4]='\0';
bounds.x1=graphic_context[n]->affine.sx*segment.x1+
graphic_context[n]->affine.ry*segment.y1+
graphic_context[n]->affine.tx;
bounds.y1=graphic_context[n]->affine.rx*segment.x1+
graphic_context[n]->affine.sy*segment.y1+
graphic_context[n]->affine.ty;
bounds.x2=graphic_context[n]->affine.sx*segment.x2+
graphic_context[n]->affine.ry*segment.y2+
graphic_context[n]->affine.tx;
bounds.y2=graphic_context[n]->affine.rx*segment.x2+
graphic_context[n]->affine.sy*segment.y2+
graphic_context[n]->affine.ty;
FormatString(key,"[%.1024s]",name);
(void) SetImageAttribute(image,key,token);
FormatString(key,"[%.1024s-geometry]",name);
FormatString(geometry,"%gx%g%+g%+g",
Max(AbsoluteValue(bounds.x2-bounds.x1+1),1),
Max(AbsoluteValue(bounds.y2-bounds.y1+1),1),
bounds.x1,bounds.y1);
(void) SetImageAttribute(image,key,geometry);
GetToken(q,&q,token);
break;
}
if (LocaleCompare("pattern",token) == 0)
{
RectangleInfo
bounds;
GetToken(q,&q,token);
(void) strlcpy(name,token,MaxTextExtent);
GetToken(q,&q,token);
bounds.x=(long) ceil(MagickAtoF(token)-0.5);
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
bounds.y=(long) ceil(MagickAtoF(token)-0.5);
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
bounds.width=(unsigned long) floor(MagickAtoF(token)+0.5);
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
bounds.height=(unsigned long) floor(MagickAtoF(token)+0.5);
for (p=q; *q != '\0'; )
{
GetToken(q,&q,token);
if (LocaleCompare(token,"pop") != 0)
continue;
GetToken(q,(char **) NULL,token);
if (LocaleCompare(token,"pattern") != 0)
continue;
break;
}
(void) strncpy(token,p,q-p-4);
token[q-p-4]='\0';
FormatString(key,"[%.1024s]",name);
(void) SetImageAttribute(image,key,token);
FormatString(key,"[%.1024s-geometry]",name);
FormatString(geometry,"%lux%lu%+ld%+ld",bounds.width,
bounds.height,bounds.x,bounds.y);
(void) SetImageAttribute(image,key,geometry);
GetToken(q,&q,token);
break;
}
if (LocaleCompare("graphic-context",token) == 0)
{
n++;
MagickReallocMemory(DrawInfo **,graphic_context,
(n+1)*sizeof(DrawInfo *));
if (graphic_context == (DrawInfo **) NULL)
{
ThrowException3(&image->exception,ResourceLimitError,
MemoryAllocationFailed,UnableToDrawOnImage);
break;
}
graphic_context[n]=
CloneDrawInfo((ImageInfo *) NULL,graphic_context[n-1]);
break;
}
if (LocaleCompare("defs",token) == 0)
break;
status=False;
break;
}
status=False;
break;
}
case 'r':
case 'R':
{
if (LocaleCompare("rectangle",keyword) == 0)
{
primitive_type=RectanglePrimitive;
break;
}
if (LocaleCompare("rotate",keyword) == 0)
{
GetToken(q,&q,token);
angle=MagickAtoF(token);
affine.sx=cos(DegreesToRadians(fmod(angle,360.0)));
affine.rx=sin(DegreesToRadians(fmod(angle,360.0)));
affine.ry=(-sin(DegreesToRadians(fmod(angle,360.0))));
affine.sy=cos(DegreesToRadians(fmod(angle,360.0)));
break;
}
if (LocaleCompare("roundRectangle",keyword) == 0)
{
primitive_type=RoundRectanglePrimitive;
break;
}
status=False;
break;
}
case 's':
case 'S':
{
if (LocaleCompare("scale",keyword) == 0)
{
GetToken(q,&q,token);
affine.sx=MagickAtoF(token);
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
affine.sy=MagickAtoF(token);
break;
}
if (LocaleCompare("skewX",keyword) == 0)
{
GetToken(q,&q,token);
angle=MagickAtoF(token);
affine.ry=tan(DegreesToRadians(fmod(angle,360.0)));
break;
}
if (LocaleCompare("skewY",keyword) == 0)
{
GetToken(q,&q,token);
angle=MagickAtoF(token);
affine.rx=tan(DegreesToRadians(fmod(angle,360.0)));
break;
}
if (LocaleCompare("stop-color",keyword) == 0)
{
PixelPacket
stop_color;
GetToken(q,&q,token);
(void) QueryColorDatabase(token,&stop_color,&image->exception);
(void) GradientImage(image,&start_color,&stop_color);
start_color=stop_color;
GetToken(q,&q,token);
break;
}
if (LocaleCompare("stroke",keyword) == 0)
{
GetToken(q,&q,token);
FormatString(pattern,"[%.1024s]",token);
if (GetImageAttribute(image,pattern) == (ImageAttribute *) NULL)
(void) QueryColorDatabase(token,&graphic_context[n]->stroke,
&image->exception);
else
(void) DrawPatternPath(image,draw_info,token,
&graphic_context[n]->stroke_pattern);
if (graphic_context[n]->stroke.opacity != TransparentOpacity)
graphic_context[n]->stroke.opacity=graphic_context[n]->opacity;
break;
}
if (LocaleCompare("stroke-antialias",keyword) == 0)
{
GetToken(q,&q,token);
graphic_context[n]->stroke_antialias=MagickAtoI(token);
break;
}
if (LocaleCompare("stroke-dasharray",keyword) == 0)
{
if (graphic_context[n]->dash_pattern != (double *) NULL)
MagickFreeMemory(graphic_context[n]->dash_pattern);
if (IsPoint(q))
{
char
*p;
p=q;
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
for (x=0; IsPoint(token); x++)
{
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
}
graphic_context[n]->dash_pattern=
MagickAllocateArray(double *,(2*x+1),sizeof(double));
if (graphic_context[n]->dash_pattern == (double *) NULL)
{
ThrowException3(&image->exception,ResourceLimitError,
MemoryAllocationFailed,UnableToDrawOnImage);
break;
}
for (j=0; j < x; j++)
{
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
graphic_context[n]->dash_pattern[j]=MagickAtoF(token);
}
if (x & 0x01)
for ( ; j < (2*x); j++)
graphic_context[n]->dash_pattern[j]=
graphic_context[n]->dash_pattern[j-x];
graphic_context[n]->dash_pattern[j]=0.0;
break;
}
GetToken(q,&q,token);
break;
}
if (LocaleCompare("stroke-dashoffset",keyword) == 0)
{
GetToken(q,&q,token);
graphic_context[n]->dash_offset=MagickAtoF(token);
break;
}
if (LocaleCompare("stroke-linecap",keyword) == 0)
{
GetToken(q,&q,token);
if (LocaleCompare("butt",token) == 0)
{
graphic_context[n]->linecap=ButtCap;
break;
}
if (LocaleCompare("round",token) == 0)
{
graphic_context[n]->linecap=RoundCap;
break;
}
if (LocaleCompare("square",token) == 0)
{
graphic_context[n]->linecap=SquareCap;
break;
}
status=False;
break;
}
if (LocaleCompare("stroke-linejoin",keyword) == 0)
{
GetToken(q,&q,token);
if (LocaleCompare("bevel",token) == 0)
{
graphic_context[n]->linejoin=BevelJoin;
break;
}
if (LocaleCompare("miter",token) == 0)
{
graphic_context[n]->linejoin=MiterJoin;
break;
}
if (LocaleCompare("round",token) == 0)
{
graphic_context[n]->linejoin=RoundJoin;
break;
}
status=False;
break;
}
if (LocaleCompare("stroke-miterlimit",keyword) == 0)
{
GetToken(q,&q,token);
graphic_context[n]->miterlimit=MagickAtoL(token);
break;
}
if (LocaleCompare("stroke-opacity",keyword) == 0)
{
GetToken(q,&q,token);
factor=strchr(token,'%') != (char *) NULL ? 0.01 : 1.0;
if (graphic_context[n]->stroke.opacity != TransparentOpacity)
graphic_context[n]->stroke.opacity=(Quantum)
((double) MaxRGB*(1.0-factor*MagickAtoF(token)));
break;
}
if (LocaleCompare("stroke-width",keyword) == 0)
{
GetToken(q,&q,token);
graphic_context[n]->stroke_width=MagickAtoF(token);
break;
}
status=False;
break;
}
case 't':
case 'T':
{
if (LocaleCompare("text",keyword) == 0)
{
primitive_type=TextPrimitive;
break;
}
if (LocaleCompare("text-align",keyword) == 0)
{
GetToken(q,&q,token);
if (LocaleCompare(token,"left") == 0)
graphic_context[n]->align=LeftAlign;
if (LocaleCompare(token,"center") == 0)
graphic_context[n]->align=CenterAlign;
if (LocaleCompare(token,"right") == 0)
graphic_context[n]->align=RightAlign;
break;
}
if (LocaleCompare("text-anchor",keyword) == 0)
{
GetToken(q,&q,token);
if (LocaleCompare(token,"start") == 0)
graphic_context[n]->align=LeftAlign;
if (LocaleCompare(token,"middle") == 0)
graphic_context[n]->align=CenterAlign;
if (LocaleCompare(token,"end") == 0)
graphic_context[n]->align=RightAlign;
break;
}
if (LocaleCompare("text-antialias",keyword) == 0)
{
GetToken(q,&q,token);
graphic_context[n]->text_antialias=MagickAtoI(token);
break;
}
if (LocaleCompare("text-undercolor",keyword) == 0)
{
GetToken(q,&q,token);
(void) QueryColorDatabase(token,&graphic_context[n]->undercolor,
&image->exception);
break;
}
if (LocaleCompare("translate",keyword) == 0)
{
GetToken(q,&q,token);
affine.tx=MagickAtoF(token);
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
affine.ty=MagickAtoF(token);
break;
}
status=False;
break;
}
case 'v':
case 'V':
{
if (LocaleCompare("viewbox",keyword) == 0)
{
GetToken(q,&q,token);
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
break;
}
status=False;
break;
}
default:
{
status=False;
break;
}
}
if (status == False)
break;
if ((affine.sx != 1.0) || (affine.rx != 0.0) || (affine.ry != 0.0) ||
(affine.sy != 1.0) || (affine.tx != 0.0) || (affine.ty != 0.0))
{
graphic_context[n]->affine.sx=current.sx*affine.sx+current.ry*affine.rx;
graphic_context[n]->affine.rx=current.rx*affine.sx+current.sy*affine.rx;
graphic_context[n]->affine.ry=current.sx*affine.ry+current.ry*affine.sy;
graphic_context[n]->affine.sy=current.rx*affine.ry+current.sy*affine.sy;
graphic_context[n]->affine.tx=
current.sx*affine.tx+current.ry*affine.ty+current.tx;
graphic_context[n]->affine.ty=
current.rx*affine.tx+current.sy*affine.ty+current.ty;
}
if (primitive_type == UndefinedPrimitive)
{
(void) LogMagickEvent(RenderEvent,GetMagickModule()," %.*s",
(int) (q-p),p);
continue;
}
/*
Parse the primitive attributes.
*/
i=0;
j=0;
for (x=0; *q != '\0'; x++)
{
/*
Define points.
*/
if (!IsPoint(q))
break;
GetToken(q,&q,token);
point.x=MagickAtoF(token);
GetToken(q,&q,token);
if (*token == ',')
GetToken(q,&q,token);
point.y=MagickAtoF(token);
GetToken(q,(char **) NULL,token);
if (*token == ',')
GetToken(q,&q,token);
primitive_info[i].primitive=primitive_type;
primitive_info[i].point=point;
primitive_info[i].coordinates=0;
primitive_info[i].method=FloodfillMethod;
i++;
if (i < (long) number_points)
continue;
number_points<<=1;
MagickReallocMemory(PrimitiveInfo *,primitive_info,
number_points*sizeof(PrimitiveInfo));
if (primitive_info == (PrimitiveInfo *) NULL)
{
ThrowException3(&image->exception,ResourceLimitError,
MemoryAllocationFailed,UnableToDrawOnImage);
break;
}
}
primitive_info[j].primitive=primitive_type;
primitive_info[j].coordinates=x;
primitive_info[j].method=FloodfillMethod;
primitive_info[j].text=(char *) NULL;
/*
Circumscribe primitive within a circle.
*/
bounds.x1=primitive_info[j].point.x;
bounds.y1=primitive_info[j].point.y;
bounds.x2=primitive_info[j].point.x;
bounds.y2=primitive_info[j].point.y;
for (k=1; k < (long) primitive_info[j].coordinates; k++)
{
point=primitive_info[j+k].point;
if (point.x < bounds.x1)
bounds.x1=point.x;
if (point.y < bounds.y1)
bounds.y1=point.y;
if (point.x > bounds.x2)
bounds.x2=point.x;
if (point.y > bounds.y2)
bounds.y2=point.y;
}
alpha=bounds.x2-bounds.x1;
beta=bounds.y2-bounds.y1;
radius=sqrt(alpha*alpha+beta*beta);
length=(size_t) (2*ceil(MagickPI*radius)+6*BezierQuantum+360);
if (i >= (long) (number_points-length))
{
number_points+=length;
MagickReallocMemory(PrimitiveInfo *,primitive_info,
number_points*sizeof(PrimitiveInfo));
if (primitive_info == (PrimitiveInfo *) NULL)
{
ThrowException3(&image->exception,ResourceLimitError,
MemoryAllocationFailed,UnableToDrawOnImage);
break;
}
}
switch (primitive_type)
{
case PointPrimitive:
default:
{
if (primitive_info[j].coordinates != 1)
{
status=False;
break;
}
TracePoint(primitive_info+j,primitive_info[j].point);
i=(long) (j+primitive_info[j].coordinates);
break;
}
case LinePrimitive:
{
if (primitive_info[j].coordinates != 2)
{
status=False;
break;
}
TraceLine(primitive_info+j,primitive_info[j].point,
primitive_info[j+1].point);
i=(long) (j+primitive_info[j].coordinates);
break;
}
case RectanglePrimitive:
{
if (primitive_info[j].coordinates != 2)
{
status=False;
break;
}
TraceRectangle(primitive_info+j,primitive_info[j].point,
primitive_info[j+1].point);
i=(long) (j+primitive_info[j].coordinates);
break;
}
case RoundRectanglePrimitive:
{
if (primitive_info[j].coordinates != 3)
{
status=False;
break;
}
TraceRoundRectangle(primitive_info+j,primitive_info[j].point,
primitive_info[j+1].point,primitive_info[j+2].point);
i=(long) (j+primitive_info[j].coordinates);
break;
}
case ArcPrimitive:
{
if (primitive_info[j].coordinates != 3)
{
primitive_type=UndefinedPrimitive;
break;
}
TraceArc(primitive_info+j,primitive_info[j].point,
primitive_info[j+1].point,primitive_info[j+2].point);
i=(long) (j+primitive_info[j].coordinates);
break;
}
case EllipsePrimitive:
{
if (primitive_info[j].coordinates != 3)
{
status=False;
break;
}
TraceEllipse(primitive_info+j,primitive_info[j].point,
primitive_info[j+1].point,primitive_info[j+2].point);
i=(long) (j+primitive_info[j].coordinates);
break;
}
case CirclePrimitive:
{
if (primitive_info[j].coordinates != 2)
{
status=False;
break;
}
TraceCircle(primitive_info+j,primitive_info[j].point,
primitive_info[j+1].point);
i=(long) (j+primitive_info[j].coordinates);
break;
}
case PolylinePrimitive:
{
if (primitive_info[j].coordinates < 2)
{
status=False;
break;
}
break;
}
case PolygonPrimitive:
{
if (primitive_info[j].coordinates < 3)
{
status=False;
break;
}
primitive_info[i]=primitive_info[j];
primitive_info[i].coordinates=0;
primitive_info[j].coordinates++;
i++;
break;
}
case BezierPrimitive:
{
if (primitive_info[j].coordinates < 3)
{
status=False;
break;
}
TraceBezier(primitive_info+j,primitive_info[j].coordinates);
i=(long) (j+primitive_info[j].coordinates);
break;
}
case PathPrimitive:
{
char
*s,
*t;
size_t
path_max_points;
GetToken(q,&q,token);
/*
Reserved Memory size is:
path_max_points = length *3/2
Where:
length - Number of tokens (length)
*3 - Maximum points number to render one segment with bezier
/ 2 - 1 point have 2 coords
+Some additional 6*BezierQuantum+360 - some approximation similar to TraceStrokePolygon code
*/
length=1;
t=token;
for (s=token; *s != '\0'; s=t)
{
(void) strtod(s,&t);
if (s == t)
{
t++;
continue;
}
length++;
}
path_max_points = length*3/2+6*BezierQuantum+360;
if (i > (long) (number_points-path_max_points))
{
number_points+=path_max_points;
MagickReallocMemory(PrimitiveInfo *,primitive_info,
number_points*sizeof(PrimitiveInfo));
if (primitive_info == (PrimitiveInfo *) NULL)
{
ThrowException3(&image->exception,ResourceLimitError,
MemoryAllocationFailed,UnableToDrawOnImage);
break;
}
}
i=(long) (j+TracePath(primitive_info+j,token));
break;
}
case ColorPrimitive:
case MattePrimitive:
{
if (primitive_info[j].coordinates != 1)
{
status=False;
break;
}
GetToken(q,&q,token);
if (LocaleCompare("point",token) == 0)
primitive_info[j].method=PointMethod;
if (LocaleCompare("replace",token) == 0)
primitive_info[j].method=ReplaceMethod;
if (LocaleCompare("floodfill",token) == 0)
primitive_info[j].method=FloodfillMethod;
if (LocaleCompare("filltoborder",token) == 0)
primitive_info[j].method=FillToBorderMethod;
if (LocaleCompare("reset",token) == 0)
primitive_info[j].method=ResetMethod;
break;
}
case TextPrimitive:
{
if (primitive_info[j].coordinates != 1)
{
status=False;
break;
}
GetToken(q,&q,token);
primitive_info[j].text=AllocateString(token);
break;
}
case ImagePrimitive:
{
if (primitive_info[j].coordinates != 2)
{
status=False;
break;
}
GetToken(q,&q,token);
primitive_info[j].text=AllocateString(token);
break;
}
}
if (primitive_info == (PrimitiveInfo *) NULL)
break;
(void) LogMagickEvent(RenderEvent,GetMagickModule()," %.*s",(int) (q-p),p);
if (status == False)
break;
primitive_info[i].primitive=UndefinedPrimitive;
if (i == 0)
continue;
/*
Transform points.
*/
for (i=0; primitive_info[i].primitive != UndefinedPrimitive; i++)
{
point=primitive_info[i].point;
primitive_info[i].point.x=graphic_context[n]->affine.sx*point.x+
graphic_context[n]->affine.ry*point.y+graphic_context[n]->affine.tx;
primitive_info[i].point.y=graphic_context[n]->affine.rx*point.x+
graphic_context[n]->affine.sy*point.y+graphic_context[n]->affine.ty;
point=primitive_info[i].point;
if (point.x < graphic_context[n]->bounds.x1)
graphic_context[n]->bounds.x1=point.x;
if (point.y < graphic_context[n]->bounds.y1)
graphic_context[n]->bounds.y1=point.y;
if (point.x > graphic_context[n]->bounds.x2)
graphic_context[n]->bounds.x2=point.x;
if (point.y > graphic_context[n]->bounds.y2)
graphic_context[n]->bounds.y2=point.y;
if (primitive_info[i].primitive == ImagePrimitive)
break;
}
if (graphic_context[n]->render)
{
if ((n != 0) && (graphic_context[n]->clip_path != (char *) NULL) &&
(LocaleCompare(graphic_context[n]->clip_path,
graphic_context[n-1]->clip_path) != 0))
(void) DrawClipPath(image,graphic_context[n],
graphic_context[n]->clip_path);
(void) DrawPrimitive(image,graphic_context[n],primitive_info);
}
if (primitive_info->text != (char *) NULL)
MagickFreeMemory(primitive_info->text);
status=MagickMonitorFormatted(q-primitive,
(magick_uint64_t) primitive_extent,
&image->exception,
RenderImageText,image->filename);
if (status == False)
break;
}
(void) LogMagickEvent(RenderEvent,GetMagickModule(),"end draw-image");
/*
Free resources.
*/
MagickFreeMemory(token);
if (primitive_info != (PrimitiveInfo *) NULL)
MagickFreeMemory(primitive_info);
MagickFreeMemory(primitive);
for ( ; n >= 0; n--)
DestroyDrawInfo(graphic_context[n]);
MagickFreeMemory(graphic_context);
if (status == False)
ThrowBinaryException(DrawError,NonconformingDrawingPrimitiveDefinition,
keyword);
return(status);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% D r a w P a t t e r n P a t h %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% DrawPatternPath() draws a pattern.
%
% The format of the DrawPatternPath method is:
%
% unsigned int DrawPatternPath(Image *image,const DrawInfo *draw_info,
% const char *name,Image **pattern)
%
% A description of each parameter follows:
%
% o image: The image.
%
% o draw_info: The draw info.
%
% o name: The pattern name.
%
% o image: The image.
%
%
*/
MagickExport unsigned int DrawPatternPath(Image *image,
const DrawInfo *draw_info,const char *name,Image **pattern)
{
char
attribute[MaxTextExtent];
const ImageAttribute
*geometry,
*path;
DrawInfo
*clone_info;
ImageInfo
*image_info;
unsigned int
status;
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
assert(draw_info != (const DrawInfo *) NULL);
assert(name != (const char *) NULL);
FormatString(attribute,"[%.1024s]",name);
path=GetImageAttribute(image,attribute);
if (path == (ImageAttribute *) NULL)
return(False);
FormatString(attribute,"[%.1024s-geometry]",name);
geometry=GetImageAttribute(image,attribute);
if (geometry == (ImageAttribute *) NULL)
return(False);
if ((*pattern) != (Image *) NULL)
DestroyImage(*pattern);
image_info=CloneImageInfo((ImageInfo *) NULL);
image_info->size=AllocateString(geometry->value);
*pattern=AllocateImage(image_info);
DestroyImageInfo(image_info);
(void) QueryColorDatabase("none",&(*pattern)->background_color,
&image->exception);
(void) SetImage(*pattern,OpaqueOpacity);
(void) LogMagickEvent(RenderEvent,GetMagickModule(),
"begin pattern-path %.1024s %.1024s",name,geometry->value);
clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
clone_info->fill_pattern=(Image *) NULL;
clone_info->stroke_pattern=(Image *) NULL;
(void) CloneString(&clone_info->primitive,path->value);
status=DrawImage(*pattern,clone_info);
DestroyDrawInfo(clone_info);
(void) LogMagickEvent(RenderEvent,GetMagickModule(),"end pattern-path");
return(status);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ D r a w P o l y g o n P r i m i t i v e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method DrawPolygonPrimitive draws a polygon on the image.
%
% The format of the DrawPolygonPrimitive method is:
%
% unsigned int DrawPolygonPrimitive(Image *image,const DrawInfo *draw_info,
% const PrimitiveInfo *primitive_info)
%
% A description of each parameter follows:
%
% o image: The image.
%
% o draw_info: The draw info.
%
% o primitive_info: Specifies a pointer to a PrimitiveInfo structure.
%
%
*/
static double GetPixelOpacity(PolygonInfo *polygon_info,const double mid,
const unsigned int fill,const FillRule fill_rule,const long x,const long y,
double *stroke_opacity)
{
double
alpha,
beta,
distance,
subpath_opacity;
int
winding_number;
register double
dx,
dy;
register EdgeInfo
*p;
register const PointInfo
*q;
register long
i;
long
j;
/*
Compute fill & stroke opacity for this (x,y) point.
*/
*stroke_opacity=0.0;
subpath_opacity=0.0;
p=polygon_info->edges;
for (j=0; j < polygon_info->number_edges; j++)
{
if (y <= (p->bounds.y1-mid-0.5))
break;
if (y > (p->bounds.y2+mid+0.5))
{
(void) DestroyEdge(polygon_info,j);
p++;
continue;
}
if (x <= (p->bounds.x1-mid-0.5))
{
p++;
continue;
}
if (x > (p->bounds.x2+mid+0.5))
{
p++;
continue;
}
for (i=Max(p->highwater,1); i < p->number_points; i++)
{
if (y <= (p->points[i-1].y-mid-0.5))
break;
if (y > (p->points[i].y+mid+0.5))
continue;
if (p->scanline != y)
{
p->scanline=y;
p->highwater=i;
}
/*
Compute distance between a point and an edge.
*/
q=p->points+i-1;
dx=(q+1)->x-q->x,
dy=(q+1)->y-q->y;
beta=dx*(x-q->x)+dy*(y-q->y);
if (beta < 0.0)
{
dx=x-q->x;
dy=y-q->y;
distance=dx*dx+dy*dy;
}
else
{
alpha=dx*dx+dy*dy;
if (beta > alpha)
{
dx=x-(q+1)->x;
dy=y-(q+1)->y;
distance=dx*dx+dy*dy;
}
else
{
alpha=1.0/alpha;
beta=dx*(y-q->y)-dy*(x-q->x);
distance=alpha*beta*beta;
}
}
/*
Compute stroke & subpath opacity.
*/
beta=0.0;
if (!p->ghostline)
{
alpha=mid+0.5;
if ((*stroke_opacity < 1.0) &&
(distance <= ((alpha+0.25)*(alpha+0.25))))
{
alpha=mid-0.5;
if (distance <= ((alpha+0.25)*(alpha+0.25)))
*stroke_opacity=1.0;
else
{
beta=1.0;
if (distance != 1.0)
beta=sqrt(distance);
alpha=beta-mid-0.5;
if (*stroke_opacity < ((alpha-0.25)*(alpha-0.25)))
*stroke_opacity=(alpha-0.25)*(alpha-0.25);
}
}
}
if (!fill || (distance > 1.0) || (subpath_opacity >= 1.0))
continue;
if (distance <= 0.0)
{
subpath_opacity=1.0;
continue;
}
if (distance > 1.0)
continue;
if (beta == 0.0)
{
beta=1.0;
if (distance != 1.0)
beta=sqrt(distance);
}
alpha=beta-1.0;
if (subpath_opacity < (alpha*alpha))
subpath_opacity=alpha*alpha;
}
p++;
}
/*
Compute fill opacity.
*/
if (!fill)
return(0.0);
if (subpath_opacity >= 1.0)
return(1.0);
/*
Determine winding number.
*/
winding_number=0;
p=polygon_info->edges;
for (j=0; j < polygon_info->number_edges; j++)
{
if (y <= p->bounds.y1)
break;
if (y > p->bounds.y2)
{
p++;
continue;
}
if (x <= p->bounds.x1)
{
p++;
continue;
}
if (x > p->bounds.x2)
{
winding_number+=p->direction ? 1 : -1;
p++;
continue;
}
for (i=Max(p->highwater,1); i < p->number_points; i++)
if (y <= p->points[i].y)
break;
q=p->points+i-1;
dx=(q+1)->x-q->x;
dy=(q+1)->y-q->y;
if ((dx*(y-q->y)) <= (dy*(x-q->x)))
winding_number+=p->direction ? 1 : -1;
p++;
}
if (fill_rule != NonZeroRule)
{
if (AbsoluteValue(winding_number) & 0x01)
return(1.0);
}
else
if (AbsoluteValue(winding_number) > 0)
return(1.0);
return(subpath_opacity);
}
static MagickPassFail
DrawPolygonPrimitive(Image *image,const DrawInfo *draw_info,
const PrimitiveInfo *primitive_info)
{
double
mid;
SegmentInfo
bounds;
ThreadViewDataSet
* restrict polygon_set;
MagickPassFail
status = MagickPass;
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
assert(draw_info != (DrawInfo *) NULL);
assert(draw_info->signature == MagickSignature);
assert(primitive_info != (PrimitiveInfo *) NULL);
/*
Nothing to do.
*/
if (primitive_info->coordinates == 0)
return(MagickPass);
{
/*
Allocate and initialize thread-specific polygon sets.
*/
PathInfo
* restrict path_info;
path_info=ConvertPrimitiveToPath(draw_info,primitive_info);
if (path_info == (PathInfo *) NULL)
return(MagickFail);
if (path_info != (PathInfo *) NULL)
{
unsigned int
index;
polygon_set=AllocateThreadViewDataSet(DestroyPolygonInfo,image,
&image->exception);
if (polygon_set != (ThreadViewDataSet *) NULL)
{
for (index=0; index < GetThreadViewDataSetAllocatedViews(polygon_set); index++)
AssignThreadViewData(polygon_set,index,(void *) ConvertPathToPolygon(path_info));
}
MagickFreeMemory(path_info);
for (index=0; index < GetThreadViewDataSetAllocatedViews(polygon_set); index++)
if (AccessThreadViewDataById(polygon_set,index) == (void *) NULL)
status=MagickFail;
if (status == MagickFail)
{
DestroyThreadViewDataSet(polygon_set);
return status;
}
}
}
/*
Compute bounding box.
*/
{
const PolygonInfo
* restrict polygon_info;
register long
i;
polygon_info=(const PolygonInfo *) AccessThreadViewData(polygon_set);
bounds=polygon_info->edges[0].bounds;
if (0) /* FIXME ??? */
DrawBoundingRectangles(image,draw_info,polygon_info);
for (i=1; i < polygon_info->number_edges; i++)
{
register const EdgeInfo
*p;
p=polygon_info->edges+i;
if (p->bounds.x1 < bounds.x1)
bounds.x1=p->bounds.x1;
if (p->bounds.y1 < bounds.y1)
bounds.y1=p->bounds.y1;
if (p->bounds.x2 > bounds.x2)
bounds.x2=p->bounds.x2;
if (p->bounds.y2 > bounds.y2)
bounds.y2=p->bounds.y2;
}
mid=ExpandAffine(&draw_info->affine)*draw_info->stroke_width/2.0;
bounds.x1-=(mid+1.0);
bounds.x1=bounds.x1 < 0.0 ? 0.0 : bounds.x1 >= image->columns ?
image->columns-1 : bounds.x1;
bounds.y1-=(mid+1.0);
bounds.y1=bounds.y1 < 0.0 ? 0.0 : bounds.y1 >= image->rows ?
image->rows-1 : bounds.y1;
bounds.x2+=(mid+1.0);
bounds.x2=bounds.x2 < 0.0 ? 0.0 : bounds.x2 >= image->columns ?
image->columns-1 : bounds.x2;
bounds.y2+=(mid+1.0);
bounds.y2=bounds.y2 < 0.0 ? 0.0 : bounds.y2 >= image->rows ?
image->rows-1 : bounds.y2;
}
(void) LogMagickEvent(RenderEvent,GetMagickModule()," begin draw-polygon");
if (primitive_info->coordinates == 1)
{
/*
Draw point.
*/
long
x_start,
x_stop,
y_start,
y_stop,
y;
PixelPacket
stroke_color;
stroke_color=draw_info->stroke;
x_start=(long) ceil(bounds.x1-0.5);
x_stop=(long) floor(bounds.x2+0.5);
y_start=(long) ceil(bounds.y1-0.5);
y_stop=(long) floor(bounds.y2+0.5);
#if defined(HAVE_OPENMP)
# pragma omp parallel for shared(status)
#endif
for (y=y_start; y <= y_stop; y++)
{
long
x;
PixelPacket
* restrict q;
MagickPassFail
thread_status;
thread_status=status;
if (thread_status == MagickFail)
continue;
x=x_start;
q=GetImagePixelsEx(image,x,y,x_stop-x+1,1,&image->exception);
if (q == (PixelPacket *) NULL)
thread_status=MagickFail;
if (thread_status != MagickFail)
{
for ( ; x <= x_stop; x++)
{
if ((x == (long) ceil(primitive_info->point.x-0.5)) &&
(y == (long) ceil(primitive_info->point.y-0.5)))
*q=stroke_color;
q++;
}
if (!SyncImagePixelsEx(image,&image->exception))
thread_status=MagickFail;
}
if (thread_status == MagickFail)
{
#if defined(HAVE_OPENMP)
# pragma omp critical (GM_DrawPolygonPrimitive_Status)
#endif
status=thread_status;
}
}
} /* if (primitive_info->coordinates == 1) */
else
{
/*
Draw polygon or line.
*/
long
x_start,
x_stop,
y_start,
y_stop,
y;
const Image
*fill_pattern=draw_info->fill_pattern,
*stroke_pattern=draw_info->stroke_pattern;
unsigned int
fill;
fill=(primitive_info->method == FillToBorderMethod) ||
(primitive_info->method == FloodfillMethod);
x_start=(long) ceil(bounds.x1-0.5);
x_stop=(long) floor(bounds.x2+0.5);
y_start=(long) ceil(bounds.y1-0.5);
y_stop=(long) floor(bounds.y2+0.5);
#if 1
#if defined(HAVE_OPENMP)
# pragma omp parallel for schedule(dynamic) shared(status)
#endif
#endif
for (y=y_start; y <= y_stop; y++)
{
PixelPacket
fill_color,
stroke_color;
double
fill_opacity,
stroke_opacity;
long
x;
PolygonInfo
* restrict polygon_info;
PixelPacket
* restrict q;
MagickPassFail
thread_status;
thread_status=status;
if (thread_status == MagickFail)
continue;
polygon_info=(PolygonInfo *) AccessThreadViewData(polygon_set);
fill_color=draw_info->fill;
stroke_color=draw_info->stroke;
x=x_start;
q=GetImagePixelsEx(image,x,y,x_stop-x+1,1,&image->exception);
if (q == (PixelPacket *) NULL)
thread_status=MagickFail;
if (thread_status != MagickFail)
{
for ( ; x <= x_stop; x++)
{
/*
Fill and/or stroke.
*/
fill_opacity=GetPixelOpacity(polygon_info,mid,fill,
draw_info->fill_rule,
x,y,&stroke_opacity);
if (!draw_info->stroke_antialias)
{
/* When stroke antialiasing is disabled, only draw for
opacities >= 0.99 in order to ensure that lines are not
drawn wider than requested. */
if (fill_opacity < 0.99)
fill_opacity=0.0;
if (stroke_opacity < 0.99)
stroke_opacity=0.0;
}
if (fill_pattern != (Image *) NULL)
(void) AcquireOnePixelByReference
(fill_pattern,&fill_color,
(long) (x-fill_pattern->tile_info.x) % fill_pattern->columns,
(long) (y-fill_pattern->tile_info.y) % fill_pattern->rows,
&image->exception);
fill_opacity=MaxRGBDouble-fill_opacity*
(MaxRGBDouble-(double) fill_color.opacity);
AlphaCompositePixel(q,&fill_color,fill_opacity,q,
(q->opacity == TransparentOpacity)
? OpaqueOpacity : q->opacity);
if (stroke_pattern != (Image *) NULL)
(void) AcquireOnePixelByReference
(stroke_pattern,&stroke_color,
(long) (x-stroke_pattern->tile_info.x) % stroke_pattern->columns,
(long) (y-stroke_pattern->tile_info.y) % stroke_pattern->rows,
&image->exception);
stroke_opacity=MaxRGBDouble-stroke_opacity*
(MaxRGBDouble-(double)stroke_color.opacity);
AlphaCompositePixel(q,&stroke_color,stroke_opacity,q,
(q->opacity == TransparentOpacity)
? OpaqueOpacity : q->opacity);
q++;
} /* for ( ; x <= x_stop; x++) */
if (!SyncImagePixelsEx(image,&image->exception))
thread_status=MagickFail;
if (thread_status == MagickFail)
{
#if defined(HAVE_OPENMP)
# pragma omp critical (GM_DrawPolygonPrimitive_Status)
#endif
status=thread_status;
}
}
}
}
(void) LogMagickEvent(RenderEvent,GetMagickModule()," end draw-polygon");
DestroyThreadViewDataSet(polygon_set);
return(status);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ D r a w P r i m i t i v e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method DrawPrimitive draws a primitive (line, rectangle, ellipse) on the
% image.
%
% The format of the DrawPrimitive method is:
%
% void DrawPrimitive(Image *image,const DrawInfo *draw_info,
% PrimitiveInfo *primitive_info)
%
% A description of each parameter follows:
%
% o image: The image.
%
% o draw_info: The draw info.
%
% o primitive_info: Specifies a pointer to a PrimitiveInfo structure.
%
%
*/
static void LogPrimitiveInfo(const PrimitiveInfo *primitive_info)
{
char
*methods[] =
{
(char *) "point",
(char *) "replace",
(char *) "floodfill",
(char *) "filltoborder",
(char *) "reset",
(char *) "?"
};
long
coordinates,
y;
PointInfo
p={0,0},
q,
point;
register long
i,
x;
x=(long) ceil(primitive_info->point.x-0.5);
y=(long) ceil(primitive_info->point.y-0.5);
switch (primitive_info->primitive)
{
case PointPrimitive:
{
(void) LogMagickEvent(RenderEvent,GetMagickModule(),
"PointPrimitive %ld,%ld %s",x,y,methods[primitive_info->method]);
return;
}
case ColorPrimitive:
{
(void) LogMagickEvent(RenderEvent,GetMagickModule(),
"ColorPrimitive %ld,%ld %s",x,y,methods[primitive_info->method]);
return;
}
case MattePrimitive:
{
(void) LogMagickEvent(RenderEvent,GetMagickModule(),
"MattePrimitive %ld,%ld %s",x,y,methods[primitive_info->method]);
return;
}
case TextPrimitive:
{
(void) LogMagickEvent(RenderEvent,GetMagickModule(),
"TextPrimitive %ld,%ld",x,y);
return;
}
case ImagePrimitive:
{
(void) LogMagickEvent(RenderEvent,GetMagickModule(),
"ImagePrimitive %ld,%ld",x,y);
return;
}
default:
break;
}
coordinates=0;
q.x=(-1.0);
q.y=(-1.0);
for (i=0; primitive_info[i].primitive != UndefinedPrimitive; i++)
{
point=primitive_info[i].point;
if (coordinates <= 0)
{
coordinates=(long) primitive_info[i].coordinates;
(void) LogMagickEvent(RenderEvent,GetMagickModule(),
" begin open (%ld)",coordinates);
p=point;
}
point=primitive_info[i].point;
if ((fabs(q.x-point.x) > MagickEpsilon) ||
(fabs(q.y-point.y) > MagickEpsilon))
(void) LogMagickEvent(RenderEvent,GetMagickModule()," %ld: %g,%g",
coordinates,point.x,point.y);
else
(void) LogMagickEvent(RenderEvent,GetMagickModule(),
" %ld: %g,%g (duplicate)",coordinates,point.x,point.y);
q=point;
coordinates--;
if (coordinates > 0)
continue;
if ((fabs(p.x-point.x) > MagickEpsilon) ||
(fabs(p.y-point.y) > MagickEpsilon))
(void) LogMagickEvent(RenderEvent,GetMagickModule()," end last (%ld)",
coordinates);
else
(void) LogMagickEvent(RenderEvent,GetMagickModule()," end open (%ld)",
coordinates);
}
}
static MagickPassFail DrawPrimitive(Image *image,const DrawInfo *draw_info,
const PrimitiveInfo *primitive_info)
{
long
y;
MonitorHandler
handler;
register long
i,
x;
register PixelPacket
*q;
unsigned int
status;
(void) LogMagickEvent(RenderEvent,GetMagickModule()," begin draw-primitive");
(void) LogMagickEvent(RenderEvent,GetMagickModule(),
" affine: %g,%g,%g,%g,%g,%g",draw_info->affine.sx,draw_info->affine.rx,
draw_info->affine.ry,draw_info->affine.sy,draw_info->affine.tx,
draw_info->affine.ty);
status=True;
x=(long) ceil(primitive_info->point.x-0.5);
y=(long) ceil(primitive_info->point.y-0.5);
switch (primitive_info->primitive)
{
case PointPrimitive:
{
q=GetImagePixels(image,x,y,1,1);
if (q == (PixelPacket *) NULL)
break;
*q=draw_info->fill;
(void) SyncImagePixels(image);
break;
}
case ColorPrimitive:
{
switch (primitive_info->method)
{
case PointMethod:
default:
{
q=GetImagePixels(image,x,y,1,1);
if (q == (PixelPacket *) NULL)
break;
*q=draw_info->fill;
(void) SyncImagePixels(image);
break;
}
case ReplaceMethod:
{
Image
*pattern;
PixelPacket
color,
target;
color=draw_info->fill;
(void) AcquireOnePixelByReference(image,&target,x,y,&image->exception);
pattern=draw_info->fill_pattern;
for (y=0; y < (long) image->rows; y++)
{
q=GetImagePixels(image,0,y,image->columns,1);
if (q == (PixelPacket *) NULL)
break;
for (x=0; x < (long) image->columns; x++)
{
if (!FuzzyColorMatch(q,&target,image->fuzz))
{
q++;
continue;
}
if (pattern != (Image *) NULL)
{
(void) AcquireOnePixelByReference(pattern,&color,
(long) (x-pattern->tile_info.x) % pattern->columns,
(long) (y-pattern->tile_info.y) % pattern->rows,
&image->exception);
if (!pattern->matte)
color.opacity=OpaqueOpacity;
}
if (color.opacity != TransparentOpacity)
AlphaCompositePixel(q,&color,color.opacity,q,q->opacity);
q++;
}
if (!SyncImagePixels(image))
break;
}
break;
}
case FloodfillMethod:
case FillToBorderMethod:
{
PixelPacket
border_color,
target;
(void) AcquireOnePixelByReference(image,&target,x,y,&image->exception);
if (primitive_info->method == FillToBorderMethod)
{
border_color=draw_info->border_color;
target=border_color;
}
(void) ColorFloodfillImage(image,draw_info,target,x,y,
primitive_info->method);
break;
}
case ResetMethod:
{
for (y=0; y < (long) image->rows; y++)
{
q=GetImagePixels(image,0,y,image->columns,1);
if (q == (PixelPacket *) NULL)
break;
for (x=0; x < (long) image->columns; x++)
{
*q=draw_info->fill;
q++;
}
if (!SyncImagePixels(image))
break;
}
break;
}
}
break;
}
case MattePrimitive:
{
if (!image->matte)
SetImageOpacity(image,OpaqueOpacity);
switch (primitive_info->method)
{
case PointMethod:
default:
{
q=GetImagePixels(image,x,y,1,1);
if (q == (PixelPacket *) NULL)
break;
q->opacity=TransparentOpacity;
(void) SyncImagePixels(image);
break;
}
case ReplaceMethod:
{
PixelPacket
target;
(void) AcquireOnePixelByReference(image,&target,x,y,&image->exception);
(void) TransparentImage(image,target,TransparentOpacity);
break;
}
case FloodfillMethod:
case FillToBorderMethod:
{
PixelPacket
border_color,
target;
(void) AcquireOnePixelByReference(image,&target,x,y,&image->exception);
if (primitive_info->method == FillToBorderMethod)
{
border_color=draw_info->border_color;
target=border_color;
}
(void) MatteFloodfillImage(image,target,TransparentOpacity,x,y,
primitive_info->method);
break;
}
case ResetMethod:
{
for (y=0; y < (long) image->rows; y++)
{
q=GetImagePixels(image,0,y,image->columns,1);
if (q == (PixelPacket *) NULL)
break;
for (x=0; x < (long) image->columns; x++)
{
q->opacity=draw_info->fill.opacity;
q++;
}
if (!SyncImagePixels(image))
break;
}
break;
}
}
break;
}
case TextPrimitive:
{
char
geometry[MaxTextExtent];
DrawInfo
*clone_info;
if (primitive_info->text == (char *) NULL)
break;
clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
(void) CloneString(&clone_info->text,primitive_info->text);
FormatString(geometry,"%+g%+g",primitive_info->point.x,
primitive_info->point.y);
(void) CloneString(&clone_info->geometry,geometry);
status=AnnotateImage(image,clone_info);
DestroyDrawInfo(clone_info);
break;
}
case ImagePrimitive:
{
AffineMatrix
affine;
Image
*composite_image;
ImageInfo
*clone_info;
if (primitive_info->text == (char *) NULL)
break;
clone_info=CloneImageInfo((ImageInfo *) NULL);
if (LocaleNCompare(primitive_info->text,"data:",5) == 0)
composite_image=ReadInlineImage(clone_info,primitive_info->text,
&image->exception);
else
{
(void) strlcpy(clone_info->filename,primitive_info->text,
MaxTextExtent);
composite_image=ReadImage(clone_info,&image->exception);
}
if (image->exception.severity != UndefinedException)
MagickError2(image->exception.severity,image->exception.reason,
image->exception.description);
DestroyImageInfo(clone_info);
if (composite_image == (Image *) NULL)
break;
if ((primitive_info[1].point.x != composite_image->columns) &&
(primitive_info[1].point.y != composite_image->rows))
{
char
geometry[MaxTextExtent];
/*
Resize image.
*/
FormatString(geometry,"%gx%g!",primitive_info[1].point.x,
primitive_info[1].point.y);
handler=SetMonitorHandler((MonitorHandler) NULL);
TransformImage(&composite_image,(char *) NULL,geometry);
(void) SetMonitorHandler(handler);
}
if (!composite_image->matte)
SetImageOpacity(composite_image,OpaqueOpacity);
if (draw_info->opacity != OpaqueOpacity)
SetImageOpacity(composite_image,draw_info->opacity);
affine=draw_info->affine;
affine.tx=x;
affine.ty=y;
(void) DrawAffineImage(image,composite_image,&affine);
DestroyImage(composite_image);
break;
}
default:
{
double
mid,
scale;
DrawInfo
*clone_info;
if (IsEventLogging())
LogPrimitiveInfo(primitive_info);
scale=ExpandAffine(&draw_info->affine);
if ((draw_info->dash_pattern != (double *) NULL) &&
(draw_info->dash_pattern[0] != 0.0) &&
((scale*draw_info->stroke_width) > MagickEpsilon) &&
(draw_info->stroke.opacity != TransparentOpacity))
{
/*
Draw dash polygon.
*/
clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
clone_info->stroke_width=0.0;
clone_info->stroke.opacity=TransparentOpacity;
status=DrawPolygonPrimitive(image,clone_info,primitive_info);
DestroyDrawInfo(clone_info);
(void) DrawDashPolygon(draw_info,primitive_info,image);
break;
}
mid=ExpandAffine(&draw_info->affine)*draw_info->stroke_width/2.0;
if ((mid > 1.0) && (draw_info->stroke.opacity != TransparentOpacity))
{
unsigned int
closed_path;
/*
Draw strokes while respecting line cap/join attributes.
*/
for (i=0; primitive_info[i].primitive != UndefinedPrimitive; i++);
closed_path=
(primitive_info[i-1].point.x == primitive_info[0].point.x) &&
(primitive_info[i-1].point.y == primitive_info[0].point.y);
i=(long) primitive_info[0].coordinates;
if ((((draw_info->linecap == RoundCap) || closed_path) &&
(draw_info->linejoin == RoundJoin)) ||
(primitive_info[i].primitive != UndefinedPrimitive))
{
(void) DrawPolygonPrimitive(image,draw_info,primitive_info);
break;
}
clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
clone_info->stroke_width=0.0;
clone_info->stroke.opacity=TransparentOpacity;
status=DrawPolygonPrimitive(image,clone_info,primitive_info);
DestroyDrawInfo(clone_info);
status|=DrawStrokePolygon(image,draw_info,primitive_info);
break;
}
status=DrawPolygonPrimitive(image,draw_info,primitive_info);
break;
}
}
(void) LogMagickEvent(RenderEvent,GetMagickModule()," end draw-primitive");
return(status);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ D r a w S t r o k e P o l y g o n %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method DrawStrokePolygon draws a stroked polygon (line, rectangle, ellipse)
% on the image while respecting the line cap and join attributes.
%
% The format of the DrawStrokePolygon method is:
%
% unsigned int DrawStrokePolygon(Image *image,const DrawInfo *draw_info,
% const PrimitiveInfo *primitive_info)
%
% A description of each parameter follows:
%
% o image: The image.
%
% o draw_info: The draw info.
%
% o primitive_info: Specifies a pointer to a PrimitiveInfo structure.
%
%
*/
static void DrawRoundLinecap(Image *image,const DrawInfo *draw_info,
const PrimitiveInfo *primitive_info)
{
PrimitiveInfo
linecap[5];
register long
i;
for (i=0; i < 4; i++)
linecap[i]=(*primitive_info);
linecap[0].coordinates=4;
linecap[1].point.x+=10.0*MagickEpsilon;
linecap[2].point.x+=10.0*MagickEpsilon;
linecap[2].point.y+=10.0*MagickEpsilon;
linecap[3].point.y+=10.0*MagickEpsilon;
linecap[4].primitive=UndefinedPrimitive;
(void) DrawPolygonPrimitive(image,draw_info,linecap);
}
static unsigned int DrawStrokePolygon(Image *image,const DrawInfo *draw_info,
const PrimitiveInfo *primitive_info)
{
DrawInfo
*clone_info;
PrimitiveInfo
*stroke_polygon;
register const PrimitiveInfo
*p,
*q;
unsigned int
closed_path,
status;
/*
Draw stroked polygon.
*/
(void) LogMagickEvent(RenderEvent,GetMagickModule(),
" begin draw-stroke-polygon");
clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
clone_info->fill=draw_info->stroke;
clone_info->stroke.opacity=TransparentOpacity;
clone_info->stroke_width=0.0;
clone_info->fill_rule=NonZeroRule;
status=True;
for (p=primitive_info; p->primitive != UndefinedPrimitive; p+=p->coordinates)
{
stroke_polygon=TraceStrokePolygon(draw_info,p);
status=DrawPolygonPrimitive(image,clone_info,stroke_polygon);
MagickFreeMemory(stroke_polygon);
q=p+p->coordinates-1;
closed_path=(q->point.x == p->point.x) && (q->point.y == p->point.y);
if ((draw_info->linecap == RoundCap) && !closed_path)
{
DrawRoundLinecap(image,draw_info,p);
DrawRoundLinecap(image,draw_info,q);
}
}
DestroyDrawInfo(clone_info);
(void) LogMagickEvent(RenderEvent,GetMagickModule(),
" end draw-stroke-polygon");
return(status);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ G e t D r a w I n f o %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method GetDrawInfo initializes draw_info to default values.
%
% The format of the GetDrawInfo method is:
%
% void GetDrawInfo(const ImageInfo *image_info,DrawInfo *draw_info)
%
% A description of each parameter follows:
%
% o image_info: The image info..
%
% o draw_info: The draw info.
%
%
*/
MagickExport void GetDrawInfo(const ImageInfo *image_info,DrawInfo *draw_info)
{
ImageInfo
*clone_info;
/*
Initialize draw attributes.
*/
assert(draw_info != (DrawInfo *) NULL);
(void) memset(draw_info,0,sizeof(DrawInfo));
clone_info=CloneImageInfo(image_info);
IdentityAffine(&draw_info->affine);
draw_info->gravity=NorthWestGravity;
draw_info->opacity=OpaqueOpacity; /* 0UL */
draw_info->fill.opacity=OpaqueOpacity; /* 0UL */
draw_info->stroke.opacity=TransparentOpacity; /* MaxRGB */
draw_info->stroke_antialias=clone_info->antialias;
draw_info->stroke_width=1.0;
draw_info->fill_rule=EvenOddRule;
draw_info->linecap=ButtCap;
draw_info->linejoin=MiterJoin;
draw_info->miterlimit=10;
draw_info->decorate=NoDecoration;
if (clone_info->font != (char *) NULL)
draw_info->font=AllocateString(clone_info->font);
if (clone_info->density != (char *) NULL)
draw_info->density=AllocateString(clone_info->density);
draw_info->text_antialias=clone_info->antialias;
draw_info->pointsize=clone_info->pointsize;
draw_info->undercolor.opacity=TransparentOpacity;
draw_info->border_color=clone_info->border_color;
draw_info->compose=CopyCompositeOp;
if (clone_info->server_name != (char *) NULL)
draw_info->server_name=AllocateString(clone_info->server_name);
draw_info->render=True;
draw_info->signature=MagickSignature;
DestroyImageInfo(clone_info);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ P e r m u t a t e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method Permutate()
%
% The format of the Permutate method is:
%
% void Permutate(long n,long k)
%
% A description of each parameter follows:
%
% o n:
%
% o k:
%
%
*/
static inline double Permutate(const long n,const long k)
{
double
r;
register long
i;
r=1.0;
for (i=k+1; i <= n; i++)
r*=i;
for (i=1; i <= (n-k); i++)
r/=i;
return(r);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ T r a c e P r i m i t i v e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% TracePrimitive is a collection of methods for generating graphic
% primitives such as arcs, ellipses, paths, etc.
%
%
*/
static void TraceArc(PrimitiveInfo *primitive_info,const PointInfo start,
const PointInfo end,const PointInfo arc)
{
PointInfo
center,
radius;
center.x=0.5*(end.x+start.x);
center.y=0.5*(end.y+start.y);
radius.x=fabs(center.x-start.x);
radius.y=fabs(center.y-start.y);
TraceEllipse(primitive_info,center,radius,arc);
}
static void TraceArcPath(PrimitiveInfo *primitive_info,const PointInfo start,
const PointInfo end,const PointInfo arc,const double angle,
const unsigned int large_arc,const unsigned int sweep)
{
double
alpha,
beta,
delta,
factor,
gamma,
theta;
PointInfo
center,
points[3],
radii;
register double
cosine,
sine;
register PrimitiveInfo
*p;
register long
i;
unsigned long
arc_segments;
if ((start.x == end.x) && (start.y == end.y))
return;
radii.x=fabs(arc.x);
radii.y=fabs(arc.y);
if ((radii.x == 0.0) || (radii.y == 0.0))
{
TraceLine(primitive_info,start,end);
return;
}
cosine=cos(DegreesToRadians(fmod(angle,360.0)));
sine=sin(DegreesToRadians(fmod(angle,360.0)));
center.x=cosine*(end.x-start.x)/2+sine*(end.y-start.y)/2;
center.y=cosine*(end.y-start.y)/2-sine*(end.x-start.x)/2;
delta=(center.x*center.x)/(radii.x*radii.x)+
(center.y*center.y)/(radii.y*radii.y);
if (delta > 1.0)
{
radii.x*=sqrt(delta);
radii.y*=sqrt(delta);
}
points[0].x=cosine*start.x/radii.x+sine*start.y/radii.x;
points[0].y=cosine*start.y/radii.y-sine*start.x/radii.y;
points[1].x=cosine*end.x/radii.x+sine*end.y/radii.x;
points[1].y=cosine*end.y/radii.y-sine*end.x/radii.y;
alpha=points[1].x-points[0].x;
beta=points[1].y-points[0].y;
factor=1.0/(alpha*alpha+beta*beta)-0.25;
if (factor <= 0.0)
factor=0.0;
else
{
factor=sqrt(factor);
if (sweep == large_arc)
factor=(-factor);
}
center.x=(points[0].x+points[1].x)/2-factor*beta;
center.y=(points[0].y+points[1].y)/2+factor*alpha;
alpha=atan2(points[0].y-center.y,points[0].x-center.x);
theta=atan2(points[1].y-center.y,points[1].x-center.x)-alpha;
if ((theta < 0.0) && sweep)
theta+=2.0*MagickPI;
else
if ((theta > 0.0) && !sweep)
theta-=2.0*MagickPI;
arc_segments=(long) ceil(fabs(theta/(0.5*MagickPI+MagickEpsilon)));
p=primitive_info;
for (i=0; i < (long) arc_segments; i++)
{
beta=0.5*((alpha+(i+1)*theta/arc_segments)-(alpha+i*theta/arc_segments));
gamma=(8.0/3.0)*sin(fmod(0.5*beta,DegreesToRadians(360.0)))*
sin(fmod(0.5*beta,DegreesToRadians(360.0)))/
sin(fmod(beta,DegreesToRadians(360.0)));
points[0].x=center.x+
cos(fmod(alpha+i*theta/arc_segments,DegreesToRadians(360.0)))-gamma*
sin(fmod(alpha+i*theta/arc_segments,DegreesToRadians(360.0)));
points[0].y=center.y+
sin(fmod(alpha+i*theta/arc_segments,DegreesToRadians(360.0)))+gamma*
cos(fmod(alpha+i*theta/arc_segments,DegreesToRadians(360.0)));
points[2].x=center.x+
cos(fmod(alpha+(i+1)*theta/arc_segments,DegreesToRadians(360.0)));
points[2].y=center.y+
sin(fmod(alpha+(i+1)*theta/arc_segments,DegreesToRadians(360.0)));
points[1].x=points[2].x+gamma*
sin(fmod(alpha+(i+1)*theta/arc_segments,DegreesToRadians(360.0)));
points[1].y=points[2].y-gamma*
cos(fmod(alpha+(i+1)*theta/arc_segments,DegreesToRadians(360.0)));
p->point.x=(p == primitive_info) ? start.x : (p-1)->point.x;
p->point.y=(p == primitive_info) ? start.y : (p-1)->point.y;
(p+1)->point.x=cosine*radii.x*points[0].x-sine*radii.y*points[0].y;
(p+1)->point.y=sine*radii.x*points[0].x+cosine*radii.y*points[0].y;
(p+2)->point.x=cosine*radii.x*points[1].x-sine*radii.y*points[1].y;
(p+2)->point.y=sine*radii.x*points[1].x+cosine*radii.y*points[1].y;
(p+3)->point.x=cosine*radii.x*points[2].x-sine*radii.y*points[2].y;
(p+3)->point.y=sine*radii.x*points[2].x+cosine*radii.y*points[2].y;
if (i == (long) (arc_segments-1))
(p+3)->point=end;
TraceBezier(p,4);
p+=p->coordinates;
}
primitive_info->coordinates=p-primitive_info;
for (i=0; i < (long) primitive_info->coordinates; i++)
{
p->primitive=primitive_info->primitive;
p--;
}
}
static void TraceBezier(PrimitiveInfo *primitive_info,
const unsigned long number_coordinates)
{
double
alpha,
*coefficients,
weight;
PointInfo
end,
point,
*points;
register long
i,
j;
register PrimitiveInfo
*p;
unsigned long
control_points,
quantum;
/*
Allocate coeficients.
*/
quantum=number_coordinates;
for (i=0; i < (long) number_coordinates; i++)
{
for (j=i+1; j < (long) number_coordinates; j++)
{
alpha=fabs(primitive_info[j].point.x-primitive_info[i].point.x);
if (alpha > quantum)
quantum=(unsigned long) alpha;
alpha=fabs(primitive_info[j].point.y-primitive_info[i].point.y);
if (alpha > quantum)
quantum=(unsigned long) alpha;
}
}
quantum=Min(quantum/number_coordinates,BezierQuantum);
control_points=quantum*number_coordinates;
coefficients=MagickAllocateArray(double *,number_coordinates,sizeof(double));
points=MagickAllocateArray(PointInfo *,control_points,sizeof(PointInfo));
if ((coefficients == (double *) NULL) || (points == (PointInfo *) NULL))
MagickFatalError3(ResourceLimitError,MemoryAllocationFailed,
UnableToDrawOnImage);
/*
Compute bezier points.
*/
end=primitive_info[number_coordinates-1].point;
weight=0.0;
for (i=0; i < (long) number_coordinates; i++)
coefficients[i]=Permutate((long) number_coordinates-1,i);
for (i=0; i < (long) control_points; i++)
{
p=primitive_info;
point.x=0;
point.y=0;
alpha=pow((double) (1.0-weight),(double) number_coordinates-1);
for (j=0; j < (long) number_coordinates; j++)
{
point.x+=alpha*coefficients[j]*p->point.x;
point.y+=alpha*coefficients[j]*p->point.y;
alpha*=weight/(1.0-weight);
p++;
}
points[i]=point;
weight+=1.0/quantum/number_coordinates;
}
/*
Bezier curves are just short segmented polys.
*/
p=primitive_info;
for (i=0; i < (long) control_points; i++)
{
TracePoint(p,points[i]);
p+=p->coordinates;
}
TracePoint(p,end);
p+=p->coordinates;
primitive_info->coordinates=p-primitive_info;
for (i=0; i < (long) primitive_info->coordinates; i++)
{
p->primitive=primitive_info->primitive;
p--;
}
MagickFreeMemory(points);
MagickFreeMemory(coefficients);
}
static void TraceCircle(PrimitiveInfo *primitive_info,const PointInfo start,
const PointInfo end)
{
double
alpha,
beta,
radius;
PointInfo
offset,
degrees;
alpha=end.x-start.x;
beta=end.y-start.y;
radius=sqrt(alpha*alpha+beta*beta);
offset.x=radius;
offset.y=radius;
degrees.x=0.0;
degrees.y=360.0;
TraceEllipse(primitive_info,start,offset,degrees);
}
static void TraceEllipse(PrimitiveInfo *primitive_info,const PointInfo start,
const PointInfo stop,const PointInfo degrees)
{
double
delta,
step,
y;
PointInfo
angle,
point;
register PrimitiveInfo
*p;
register long
i;
/*
Ellipses are just short segmented polys.
*/
delta=2.0/Max(stop.x,stop.y);
step=MagickPI/8.0;
if (delta < (MagickPI/8.0))
step=MagickPI/(4*ceil(MagickPI/delta/2));
angle.x=DegreesToRadians(degrees.x);
y=degrees.y;
while (y < degrees.x)
y+=360.0;
angle.y=DegreesToRadians(y);
for (p=primitive_info; angle.x < angle.y; angle.x+=step)
{
point.x=cos(fmod(angle.x,DegreesToRadians(360.0)))*stop.x+start.x;
point.y=sin(fmod(angle.x,DegreesToRadians(360.0)))*stop.y+start.y;
TracePoint(p,point);
p+=p->coordinates;
}
point.x=cos(fmod(angle.y,DegreesToRadians(360.0)))*stop.x+start.x;
point.y=sin(fmod(angle.y,DegreesToRadians(360.0)))*stop.y+start.y;
TracePoint(p,point);
p+=p->coordinates;
primitive_info->coordinates=p-primitive_info;
for (i=0; i < (long) primitive_info->coordinates; i++)
{
p->primitive=primitive_info->primitive;
p--;
}
}
static void TraceLine(PrimitiveInfo *primitive_info,const PointInfo start,
const PointInfo end)
{
TracePoint(primitive_info,start);
if ((AbsoluteValue(start.x-end.x) <= MagickEpsilon) &&
(AbsoluteValue(start.y-end.y) <= MagickEpsilon))
{
primitive_info->primitive=PointPrimitive;
primitive_info->coordinates=1;
return;
}
TracePoint(primitive_info+1,end);
(primitive_info+1)->primitive=primitive_info->primitive;
primitive_info->coordinates=2;
}
static unsigned long TracePath(PrimitiveInfo *primitive_info,const char *path)
{
char
*p,
token[MaxTextExtent];
double
x,
y;
int
attribute,
last_attribute;
PointInfo
end={0,0},
points[4],
point,
start={0,0};
PrimitiveType
primitive_type;
register PrimitiveInfo
*q;
register long
i;
unsigned long
number_coordinates,
z_count;
attribute=0;
point.x=0;
point.y=0;
number_coordinates=0;
z_count=0;
primitive_type=primitive_info->primitive;
q=primitive_info;
for (p=(char *) path; *p != '\0'; )
{
while (isspace((int) *p))
p++;
if (*p == '\0')
break;
last_attribute=attribute;
attribute=(*p++);
switch (attribute)
{
case 'a':
case 'A':
{
double
angle;
PointInfo
arc;
unsigned int
large_arc,
sweep;
/*
Compute arc points.
*/
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
arc.x=MagickAtoF(token);
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
arc.y=MagickAtoF(token);
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
angle=MagickAtoF(token);
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
large_arc=MagickAtoI(token);
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
sweep=MagickAtoI(token);
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
x=MagickAtoF(token);
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
y=MagickAtoF(token);
end.x=attribute == 'A' ? x : point.x+x;
end.y=attribute == 'A' ? y : point.y+y;
TraceArcPath(q,point,end,arc,angle,large_arc,sweep);
q+=q->coordinates;
point=end;
break;
}
case 'c':
case 'C':
{
/*
Compute bezier points.
*/
do
{
points[0]=point;
for (i=1; i <= 3; i++)
{
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
x=MagickAtoF(token);
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
y=MagickAtoF(token);
end.x=attribute == 'C' ? x : point.x+x;
end.y=attribute == 'C' ? y : point.y+y;
points[i]=end;
}
for (i=0; i <= 3; i++)
(q+i)->point=points[i];
TraceBezier(q,4);
q+=q->coordinates;
point=end;
} while (IsPoint(p));
break;
}
case 'H':
case 'h':
{
do
{
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
x=MagickAtoF(token);
point.x=attribute == 'H' ? x: point.x+x;
TracePoint(q,point);
q+=q->coordinates;
} while (IsPoint(p));
break;
}
case 'l':
case 'L':
{
do
{
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
x=MagickAtoF(token);
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
y=MagickAtoF(token);
point.x=attribute == 'L' ? x : point.x+x;
point.y=attribute == 'L' ? y : point.y+y;
TracePoint(q,point);
q+=q->coordinates;
} while (IsPoint(p));
break;
}
case 'M':
case 'm':
{
if (q != primitive_info)
{
primitive_info->coordinates=q-primitive_info;
number_coordinates+=primitive_info->coordinates;
primitive_info=q;
}
do
{
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
x=MagickAtoF(token);
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
y=MagickAtoF(token);
point.x=attribute == 'M' ? x : point.x+x;
point.y=attribute == 'M' ? y : point.y+y;
TracePoint(q,point);
q+=q->coordinates;
} while (IsPoint(p));
start=point;
break;
}
case 'q':
case 'Q':
{
/*
Compute bezier points.
*/
do
{
points[0]=point;
for (i=1; i < 3; i++)
{
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
x=MagickAtoF(token);
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
y=MagickAtoF(token);
if (*p == ',')
p++;
end.x=attribute == 'Q' ? x : point.x+x;
end.y=attribute == 'Q' ? y : point.y+y;
points[i]=end;
}
for (i=0; i < 3; i++)
(q+i)->point=points[i];
TraceBezier(q,3);
q+=q->coordinates;
point=end;
} while (IsPoint(p));
break;
}
case 's':
case 'S':
{
/*
Compute bezier points.
*/
do
{
points[0]=points[3];
points[1].x=2.0*points[3].x-points[2].x;
points[1].y=2.0*points[3].y-points[2].y;
for (i=2; i <= 3; i++)
{
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
x=MagickAtoF(token);
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
y=MagickAtoF(token);
if (*p == ',')
p++;
end.x=attribute == 'S' ? x : point.x+x;
end.y=attribute == 'S' ? y : point.y+y;
points[i]=end;
}
if (strchr("CcSs",last_attribute) == (char *) NULL)
{
points[0]=points[2];
points[1]=points[3];
}
for (i=0; i <= 3; i++)
(q+i)->point=points[i];
TraceBezier(q,4);
q+=q->coordinates;
point=end;
} while (IsPoint(p));
break;
}
case 't':
case 'T':
{
/*
Compute bezier points.
*/
do
{
points[0]=points[2];
points[1].x=2.0*points[2].x-points[1].x;
points[1].y=2.0*points[2].y-points[1].y;
for (i=2; i < 3; i++)
{
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
x=MagickAtoF(token);
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
y=MagickAtoF(token);
end.x=attribute == 'T' ? x : point.x+x;
end.y=attribute == 'T' ? y : point.y+y;
points[i]=end;
}
if (strchr("QqTt",last_attribute) == (char *) NULL)
{
points[0]=points[2];
points[1]=points[3];
}
for (i=0; i < 3; i++)
(q+i)->point=points[i];
TraceBezier(q,3);
q+=q->coordinates;
point=end;
} while (IsPoint(p));
break;
}
case 'v':
case 'V':
{
do
{
GetToken(p,&p,token);
if (*token == ',')
GetToken(p,&p,token);
y=MagickAtoF(token);
point.y=attribute == 'V' ? y : point.y+y;
TracePoint(q,point);
q+=q->coordinates;
} while (IsPoint(p));
break;
}
case 'z':
case 'Z':
{
point=start;
TracePoint(q,point);
q+=q->coordinates;
primitive_info->coordinates=q-primitive_info;
number_coordinates+=primitive_info->coordinates;
primitive_info=q;
z_count++;
break;
}
default:
{
if (isalpha((int) attribute))
(void) fprintf(stderr,"attribute not recognized: %c\n",attribute);
break;
}
}
}
primitive_info->coordinates=q-primitive_info;
number_coordinates+=primitive_info->coordinates;
for (i=0; i < (long) number_coordinates; i++)
{
q--;
q->primitive=primitive_type;
if (z_count > 1)
q->method=FillToBorderMethod;
}
q=primitive_info;
return(number_coordinates);
}
static void TracePoint(PrimitiveInfo *primitive_info,const PointInfo point)
{
primitive_info->coordinates=1;
primitive_info->point=point;
}
static void TraceRectangle(PrimitiveInfo *primitive_info,const PointInfo start,
const PointInfo end)
{
PointInfo
point;
register PrimitiveInfo
*p;
register long
i;
p=primitive_info;
TracePoint(p,start);
p+=p->coordinates;
point.x=start.x;
point.y=end.y;
TracePoint(p,point);
p+=p->coordinates;
TracePoint(p,end);
p+=p->coordinates;
point.x=end.x;
point.y=start.y;
TracePoint(p,point);
p+=p->coordinates;
TracePoint(p,start);
p+=p->coordinates;
primitive_info->coordinates=p-primitive_info;
for (i=0; i < (long) primitive_info->coordinates; i++)
{
p->primitive=primitive_info->primitive;
p--;
}
}
static void TraceRoundRectangle(PrimitiveInfo *primitive_info,
const PointInfo start,const PointInfo end,PointInfo arc)
{
PointInfo
degrees,
offset,
point;
register PrimitiveInfo
*p;
register long
i;
p=primitive_info;
offset.x=AbsoluteValue(end.x-start.x);
offset.y=AbsoluteValue(end.y-start.y);
if (arc.x > (0.5*offset.x))
arc.x=0.5*offset.x;
if (arc.y > (0.5*offset.y))
arc.y=0.5*offset.y;
point.x=start.x+offset.x-arc.x;
point.y=start.y+arc.y;
degrees.x=270.0;
degrees.y=360.0;
TraceEllipse(p,point,arc,degrees);
p+=p->coordinates;
point.x=start.x+offset.x-arc.x;
point.y=start.y+offset.y-arc.y;
degrees.x=0.0;
degrees.y=90.0;
TraceEllipse(p,point,arc,degrees);
p+=p->coordinates;
point.x=start.x+arc.x;
point.y=start.y+offset.y-arc.y;
degrees.x=90.0;
degrees.y=180.0;
TraceEllipse(p,point,arc,degrees);
p+=p->coordinates;
point.x=start.x+arc.x;
point.y=start.y+arc.y;
degrees.x=180.0;
degrees.y=270.0;
TraceEllipse(p,point,arc,degrees);
p+=p->coordinates;
TracePoint(p,primitive_info->point);
p+=p->coordinates;
primitive_info->coordinates=p-primitive_info;
for (i=0; i < (long) primitive_info->coordinates; i++)
{
p->primitive=primitive_info->primitive;
p--;
}
}
static void TraceSquareLinecap(PrimitiveInfo *primitive_info,
const unsigned long number_vertices,const double offset)
{
double
distance;
long
j;
register double
dx,
dy;
register long
i;
dx=0.0;
dy=0.0;
for (i=1; i < (long) number_vertices; i++)
{
dx=primitive_info[0].point.x-primitive_info[i].point.x;
dy=primitive_info[0].point.y-primitive_info[i].point.y;
if ((fabs(dx) >= MagickEpsilon) || (fabs(dy) >= MagickEpsilon))
break;
}
distance=sqrt(dx*dx+dy*dy+MagickEpsilon);
primitive_info[0].point.x=primitive_info[i].point.x+
dx*(distance+offset)/distance;
primitive_info[0].point.y=primitive_info[i].point.y+
dy*(distance+offset)/distance;
for (j=(long) number_vertices-2; j >= 0; j--)
{
dx=primitive_info[number_vertices-1].point.x-primitive_info[j].point.x;
dy=primitive_info[number_vertices-1].point.y-primitive_info[j].point.y;
if ((fabs(dx) >= MagickEpsilon) || (fabs(dy) >= MagickEpsilon))
break;
}
distance=sqrt(dx*dx+dy*dy+MagickEpsilon);
primitive_info[number_vertices-1].point.x=primitive_info[j].point.x+
dx*(distance+offset)/distance;
primitive_info[number_vertices-1].point.y=primitive_info[j].point.y+
dy*(distance+offset)/distance;
}
static PrimitiveInfo *TraceStrokePolygon(const DrawInfo *draw_info,
const PrimitiveInfo *primitive_info)
{
typedef struct _LineSegment
{
double
p,
q;
} LineSegment;
double
delta_theta,
dot_product,
mid,
miterlimit;
LineSegment
dx={0,0},
dy={0,0},
inverse_slope={0,0},
slope={0,0},
theta={0,0};
PointInfo
box_p[5],
box_q[5],
center,
offset,
*path_p,
*path_q;
PrimitiveInfo
*polygon_primitive,
*stroke_polygon;
register long
i;
unsigned int
closed_path;
unsigned long
arc_segments,
j,
n,
max_strokes,
number_vertices,
p,
q;
/*
Allocate paths.
*/
number_vertices=primitive_info->coordinates;
max_strokes=2*number_vertices+6*BezierQuantum+360;
path_p=MagickAllocateArray(PointInfo *,max_strokes,sizeof(PointInfo));
path_q=MagickAllocateArray(PointInfo *,max_strokes,sizeof(PointInfo));
polygon_primitive=
MagickAllocateArray(PrimitiveInfo *,(number_vertices+2),
sizeof(PrimitiveInfo));
if ((path_p == (PointInfo *) NULL) || (path_q == (PointInfo *) NULL) ||
(polygon_primitive == (PrimitiveInfo *) NULL))
return((PrimitiveInfo *) NULL);
(void) memcpy(polygon_primitive,primitive_info,number_vertices*
sizeof(PrimitiveInfo));
closed_path=
(primitive_info[number_vertices-1].point.x == primitive_info[0].point.x) &&
(primitive_info[number_vertices-1].point.y == primitive_info[0].point.y);
if ((draw_info->linejoin == RoundJoin) ||
((draw_info->linejoin == MiterJoin) && closed_path))
{
polygon_primitive[number_vertices]=primitive_info[1];
number_vertices++;
}
polygon_primitive[number_vertices].primitive=UndefinedPrimitive;
/*
Compute the slope for the first line segment, p.
*/
for (n=1; n < number_vertices; n++)
{
dx.p=polygon_primitive[n].point.x-polygon_primitive[0].point.x;
dy.p=polygon_primitive[n].point.y-polygon_primitive[0].point.y;
if ((fabs(dx.p) >= MagickEpsilon) || (fabs(dy.p) >= MagickEpsilon))
break;
}
slope.p=0.0;
inverse_slope.p=0.0;
if (fabs(dx.p) <= MagickEpsilon)
{
if (dx.p >= 0.0)
slope.p=dy.p < 0.0 ? -1.0/MagickEpsilon : 1.0/MagickEpsilon;
else
slope.p=dy.p < 0.0 ? 1.0/MagickEpsilon : -1.0/MagickEpsilon;
}
else
if (fabs(dy.p) <= MagickEpsilon)
{
if (dy.p >= 0.0)
inverse_slope.p=dx.p < 0.0 ? -1.0/MagickEpsilon : 1.0/MagickEpsilon;
else
inverse_slope.p=dx.p < 0.0 ? 1.0/MagickEpsilon : -1.0/MagickEpsilon;
}
else
{
slope.p=dy.p/dx.p;
inverse_slope.p=(-1.0/slope.p);
}
mid=ExpandAffine(&draw_info->affine)*draw_info->stroke_width/2.0;
miterlimit=draw_info->miterlimit*draw_info->miterlimit*mid*mid;
if ((draw_info->linecap == SquareCap) && !closed_path)
TraceSquareLinecap(polygon_primitive,number_vertices,mid);
offset.x=sqrt(mid*mid/(inverse_slope.p*inverse_slope.p+1.0));
offset.y=offset.x*inverse_slope.p;
if ((dy.p*offset.x-dx.p*offset.y) > 0.0)
{
box_p[0].x=polygon_primitive[0].point.x-offset.x;
box_p[0].y=polygon_primitive[0].point.y-offset.x*inverse_slope.p;
box_p[1].x=polygon_primitive[n].point.x-offset.x;
box_p[1].y=polygon_primitive[n].point.y-offset.x*inverse_slope.p;
box_q[0].x=polygon_primitive[0].point.x+offset.x;
box_q[0].y=polygon_primitive[0].point.y+offset.x*inverse_slope.p;
box_q[1].x=polygon_primitive[n].point.x+offset.x;
box_q[1].y=polygon_primitive[n].point.y+offset.x*inverse_slope.p;
}
else
{
box_p[0].x=polygon_primitive[0].point.x+offset.x;
box_p[0].y=polygon_primitive[0].point.y+offset.y;
box_p[1].x=polygon_primitive[n].point.x+offset.x;
box_p[1].y=polygon_primitive[n].point.y+offset.y;
box_q[0].x=polygon_primitive[0].point.x-offset.x;
box_q[0].y=polygon_primitive[0].point.y-offset.y;
box_q[1].x=polygon_primitive[n].point.x-offset.x;
box_q[1].y=polygon_primitive[n].point.y-offset.y;
}
/*
Create strokes for the line join attribute: bevel, miter, round.
*/
p=0;
q=0;
path_q[p++]=box_q[0];
path_p[q++]=box_p[0];
for (i=(long) n+1; i < (long) number_vertices; i++)
{
/*
Compute the slope for this line segment, q.
*/
dx.q=polygon_primitive[i].point.x-polygon_primitive[n].point.x;
dy.q=polygon_primitive[i].point.y-polygon_primitive[n].point.y;
dot_product=dx.q*dx.q+dy.q*dy.q;
if (dot_product < 0.25)
continue;
slope.q=0.0;
inverse_slope.q=0.0;
if (fabs(dx.q) < MagickEpsilon)
{
if (dx.q >= 0.0)
slope.q=dy.q < 0.0 ? -1.0/MagickEpsilon : 1.0/MagickEpsilon;
else
slope.q=dy.q < 0.0 ? 1.0/MagickEpsilon : -1.0/MagickEpsilon;
}
else
if (fabs(dy.q) <= MagickEpsilon)
{
if (dy.q >= 0.0)
inverse_slope.q=dx.q < 0.0 ? -1.0/MagickEpsilon : 1.0/MagickEpsilon;
else
inverse_slope.q=dx.q < 0.0 ? 1.0/MagickEpsilon : -1.0/MagickEpsilon;
}
else
{
slope.q=dy.q/dx.q;
inverse_slope.q=(-1.0/slope.q);
}
offset.x=sqrt(mid*mid/(inverse_slope.q*inverse_slope.q+1.0));
offset.y=offset.x*inverse_slope.q;
dot_product=dy.q*offset.x-dx.q*offset.y;
if (dot_product > 0.0)
{
box_p[2].x=polygon_primitive[n].point.x-offset.x;
box_p[2].y=polygon_primitive[n].point.y-offset.y;
box_p[3].x=polygon_primitive[i].point.x-offset.x;
box_p[3].y=polygon_primitive[i].point.y-offset.y;
box_q[2].x=polygon_primitive[n].point.x+offset.x;
box_q[2].y=polygon_primitive[n].point.y+offset.y;
box_q[3].x=polygon_primitive[i].point.x+offset.x;
box_q[3].y=polygon_primitive[i].point.y+offset.y;
}
else
{
box_p[2].x=polygon_primitive[n].point.x+offset.x;
box_p[2].y=polygon_primitive[n].point.y+offset.y;
box_p[3].x=polygon_primitive[i].point.x+offset.x;
box_p[3].y=polygon_primitive[i].point.y+offset.y;
box_q[2].x=polygon_primitive[n].point.x-offset.x;
box_q[2].y=polygon_primitive[n].point.y-offset.y;
box_q[3].x=polygon_primitive[i].point.x-offset.x;
box_q[3].y=polygon_primitive[i].point.y-offset.y;
}
if (fabs(slope.p-slope.q) <= MagickEpsilon)
{
box_p[4]=box_p[1];
box_q[4]=box_q[1];
}
else
{
box_p[4].x=(slope.p*box_p[0].x-box_p[0].y-slope.q*box_p[3].x+
box_p[3].y)/(slope.p-slope.q);
box_p[4].y=slope.p*(box_p[4].x-box_p[0].x)+box_p[0].y;
box_q[4].x=(slope.p*box_q[0].x-box_q[0].y-slope.q*box_q[3].x+
box_q[3].y)/(slope.p-slope.q);
box_q[4].y=slope.p*(box_q[4].x-box_q[0].x)+box_q[0].y;
}
if (q >= (max_strokes-6*BezierQuantum-360))
{
max_strokes+=6*BezierQuantum+360;
MagickReallocMemory(PointInfo *,path_p,max_strokes*sizeof(PointInfo));
MagickReallocMemory(PointInfo *,path_q,max_strokes*sizeof(PointInfo));
if ((path_p == (PointInfo *) NULL) || (path_q == (PointInfo *) NULL))
{
MagickFreeMemory(polygon_primitive);
return((PrimitiveInfo *) NULL);
}
}
dot_product=dx.q*dy.p-dx.p*dy.q;
if (dot_product <= 0.0)
switch (draw_info->linejoin)
{
case BevelJoin:
{
path_q[q++]=box_q[1];
path_q[q++]=box_q[2];
dot_product=(box_q[4].x-box_p[4].x)*(box_q[4].x-box_p[4].x)+
(box_q[4].y-box_p[4].y)*(box_q[4].y-box_p[4].y);
if (dot_product <= miterlimit)
path_p[p++]=box_p[4];
else
{
path_p[p++]=box_p[1];
path_p[p++]=box_p[2];
}
break;
}
case MiterJoin:
{
dot_product=(box_q[4].x-box_p[4].x)*(box_q[4].x-box_p[4].x)+
(box_q[4].y-box_p[4].y)*(box_q[4].y-box_p[4].y);
if (dot_product > miterlimit)
{
path_q[q++]=box_q[1];
path_q[q++]=box_q[2];
path_p[p++]=box_p[1];
path_p[p++]=box_p[2];
}
else
{
path_q[q++]=box_q[4];
path_p[p++]=box_p[4];
}
break;
}
case RoundJoin:
{
dot_product=(box_q[4].x-box_p[4].x)*(box_q[4].x-box_p[4].x)+
(box_q[4].y-box_p[4].y)*(box_q[4].y-box_p[4].y);
if (dot_product <= miterlimit)
path_p[p++]=box_p[4];
else
{
path_p[p++]=box_p[1];
path_p[p++]=box_p[2];
}
center=polygon_primitive[n].point;
theta.p=atan2(box_q[1].y-center.y,box_q[1].x-center.x);
theta.q=atan2(box_q[2].y-center.y,box_q[2].x-center.x);
if (theta.q < theta.p)
theta.q+=2.0*MagickPI;
arc_segments=(long) ceil((theta.q-theta.p)/(2.0*sqrt(1.0/mid)));
path_q[q].x=box_q[1].x;
path_q[q].y=box_q[1].y;
q++;
for (j=1; j < arc_segments; j++)
{
delta_theta=j*(theta.q-theta.p)/arc_segments;
path_q[q].x=center.x+mid*
cos(fmod(theta.p+delta_theta,DegreesToRadians(360.0)));
path_q[q].y=center.y+mid*
sin(fmod(theta.p+delta_theta,DegreesToRadians(360.0)));
q++;
}
path_q[q++]=box_q[2];
break;
}
default:
break;
}
else
switch (draw_info->linejoin)
{
case BevelJoin:
{
path_p[p++]=box_p[1];
path_p[p++]=box_p[2];
dot_product=(box_q[4].x-box_p[4].x)*(box_q[4].x-box_p[4].x)+
(box_q[4].y-box_p[4].y)*(box_q[4].y-box_p[4].y);
if (dot_product <= miterlimit)
path_q[q++]=box_q[4];
else
{
path_q[q++]=box_q[1];
path_q[q++]=box_q[2];
}
break;
}
case MiterJoin:
{
dot_product=(box_q[4].x-box_p[4].x)*(box_q[4].x-box_p[4].x)+
(box_q[4].y-box_p[4].y)*(box_q[4].y-box_p[4].y);
if (dot_product <= miterlimit)
{
path_q[q++]=box_q[4];
path_p[p++]=box_p[4];
}
else
{
path_q[q++]=box_q[1];
path_q[q++]=box_q[2];
path_p[p++]=box_p[1];
path_p[p++]=box_p[2];
}
break;
}
case RoundJoin:
{
dot_product=(box_q[4].x-box_p[4].x)*(box_q[4].x-box_p[4].x)+
(box_q[4].y-box_p[4].y)*(box_q[4].y-box_p[4].y);
if (dot_product <= miterlimit)
path_q[q++]=box_q[4];
else
{
path_q[q++]=box_q[1];
path_q[q++]=box_q[2];
}
center=polygon_primitive[n].point;
theta.p=atan2(box_p[1].y-center.y,box_p[1].x-center.x);
theta.q=atan2(box_p[2].y-center.y,box_p[2].x-center.x);
if (theta.p < theta.q)
theta.p+=2.0*MagickPI;
arc_segments=(long) ceil((theta.p-theta.q)/(2.0*sqrt(1.0/mid)));
path_p[p++]=box_p[1];
for (j=1; j < arc_segments; j++)
{
delta_theta=j*(theta.q-theta.p)/arc_segments;
path_p[p].x=center.x+mid*
cos(fmod(theta.p+delta_theta,DegreesToRadians(360.0)));
path_p[p].y=center.y+mid*
sin(fmod(theta.p+delta_theta,DegreesToRadians(360.0)));
p++;
}
path_p[p++]=box_p[2];
break;
}
default:
break;
}
slope.p=slope.q;
inverse_slope.p=inverse_slope.q;
box_p[0]=box_p[2];
box_p[1]=box_p[3];
box_q[0]=box_q[2];
box_q[1]=box_q[3];
dx.p=dx.q;
dy.p=dy.q;
n=i;
}
path_p[p++]=box_p[1];
path_q[q++]=box_q[1];
/*
Trace stroked polygon.
*/
stroke_polygon=
MagickAllocateArray(PrimitiveInfo *,(p+q+2*closed_path+2),
sizeof(PrimitiveInfo));
if (stroke_polygon != (PrimitiveInfo *) NULL)
{
for (i=0; i < (long) p; i++)
{
stroke_polygon[i]=polygon_primitive[0];
stroke_polygon[i].point=path_p[i];
}
if (closed_path)
{
stroke_polygon[i]=polygon_primitive[0];
stroke_polygon[i].point=stroke_polygon[0].point;
i++;
}
for ( ; i < (long) (p+q+closed_path); i++)
{
stroke_polygon[i]=polygon_primitive[0];
stroke_polygon[i].point=path_q[p+q+closed_path-(i+1)];
}
if (closed_path)
{
stroke_polygon[i]=polygon_primitive[0];
stroke_polygon[i].point=stroke_polygon[p+closed_path].point;
i++;
}
stroke_polygon[i]=polygon_primitive[0];
stroke_polygon[i].point=stroke_polygon[0].point;
i++;
stroke_polygon[i].primitive=UndefinedPrimitive;
stroke_polygon[0].coordinates=p+q+2*closed_path+1;
}
MagickFreeMemory(path_p);
MagickFreeMemory(path_q);
MagickFreeMemory(polygon_primitive);
return(stroke_polygon);
}