/* [<][>][^][v][top][bottom][index][help] */
DEFINITIONS
This source file includes following definitions.
- IsMVG
- ReadMVGImage
- RegisterMVGImage
- UnregisterMVGImage
- WriteMVGImage
/*
% Copyright (C) 2003, 2004 GraphicsMagick Group
% Copyright (C) 2002 ImageMagick Studio
%
% 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.
%
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% %
% %
% %
% M M V V GGGG %
% MM MM V V G %
% M M M V V G GG %
% M M V V G G %
% M M V GGG %
% %
% Read/Write Magick Vector Graphics Metafiles. %
% %
% %
% Software Design %
% John Cristy %
% April 2000 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/attribute.h"
#include "magick/blob.h"
#include "magick/magick.h"
#include "magick/render.h"
#include "magick/utility.h"
/*
Forward declarations.
*/
static unsigned int
WriteMVGImage(const ImageInfo *,Image *);
/*
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% I s M V G %
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% Method IsMVG returns True if the image format type, identified by the
% magick string, is MVG.
%
% The format of the IsMVG method is:
%
% unsigned int IsMVG(const unsigned char *magick,const size_t length)
%
% A description of each parameter follows:
%
% o status: Method IsMVG returns True if the image format type is MVG.
%
% o magick: This string is generally the first few bytes of an image file
% or blob.
%
% o length: Specifies the length of the magick string.
%
%
*/
static unsigned int IsMVG(const unsigned char *magick,const size_t length)
{
if (length < 7)
return(False);
if (LocaleNCompare((char *) magick,"viewbox",7) == 0)
return(True);
return(False);
}
/*
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% R e a d M V G I m a g e %
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% Method ReadMVGImage creates a gradient image and initializes it to
% the X server color range as specified by the filename. It allocates the
% memory necessary for the new Image structure and returns a pointer to the
% new image.
%
% The format of the ReadMVGImage method is:
%
% Image *ReadMVGImage(const ImageInfo *image_info,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadMVGImage returns a pointer to the image after
% creating it. A null image is returned if there is a memory shortage
% or if the image cannot be read.
%
% o image_info: Specifies a pointer to a ImageInfo structure.
%
% o exception: return any errors or warnings in this structure.
%
%
*/
static Image *ReadMVGImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
#define BoundingBox "viewbox"
DrawInfo
*draw_info;
Image
*image;
size_t
length;
unsigned int
status;
/*
Open image.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
image=AllocateImage(image_info);
status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == False)
ThrowReaderException(FileOpenError,UnableToOpenFile,image);
if ((image->columns == 0) || (image->rows == 0))
{
char
primitive[MaxTextExtent];
register char
*p;
SegmentInfo
bounds;
/*
Determine size of image canvas.
*/
while (ReadBlobString(image,primitive) != (char *) NULL)
{
for (p=primitive; (*p == ' ') || (*p == '\t'); p++);
if (LocaleNCompare(BoundingBox,p,strlen(BoundingBox)) != 0)
continue;
(void) sscanf(p,"viewbox %lf %lf %lf %lf",&bounds.x1,&bounds.y1,
&bounds.x2,&bounds.y2);
image->columns=(unsigned long) (bounds.x2-bounds.x1+0.5);
image->rows=(unsigned long) (bounds.y2-bounds.y1+0.5);
break;
}
}
if ((image->columns == 0) || (image->rows == 0))
ThrowReaderException(OptionError,MustSpecifyImageSize,image);
/*
Render drawing.
*/
(void) SetImage(image,OpaqueOpacity);
draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
draw_info->fill=image_info->pen;
if (GetBlobStreamData(image))
draw_info->primitive=AllocateString((char *) GetBlobStreamData(image));
else
draw_info->primitive=(char *) FileToBlob(image->filename,&length,exception);
if (draw_info->primitive == (char *) NULL)
return((Image *) NULL);
(void) DrawImage(image,draw_info);
DestroyDrawInfo(draw_info);
CloseBlob(image);
return(image);
}
/*
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% R e g i s t e r M V G I m a g e %
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% Method RegisterMVGImage adds attributes for the MVG image format
% to the list of supported formats. The attributes include the image format
% tag, a method to read and/or write the format, whether the format
% supports the saving of more than one frame to the same file or blob,
% whether the format supports native in-memory I/O, and a brief
% description of the format.
%
% The format of the RegisterMVGImage method is:
%
% RegisterMVGImage(void)
%
*/
ModuleExport void RegisterMVGImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("MVG");
entry->decoder=(DecoderHandler) ReadMVGImage;
entry->encoder=(EncoderHandler) WriteMVGImage;
entry->magick=(MagickHandler) IsMVG;
entry->adjoin=False;
entry->seekable_stream=True;
entry->description="Magick Vector Graphics";
entry->module="MVG";
(void) RegisterMagickInfo(entry);
}
/*
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% U n r e g i s t e r M V G I m a g e %
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%
% Method UnregisterMVGImage removes format registrations made by the
% MVG module from the list of supported formats.
%
% The format of the UnregisterMVGImage method is:
%
% UnregisterMVGImage(void)
%
*/
ModuleExport void UnregisterMVGImage(void)
{
(void) UnregisterMagickInfo("MVG");
}
/*
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% W r i t e M V G I m a g e %
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% Method WriteMVGImage writes an image to a file in MVG image format.
%
% The format of the WriteMVGImage method is:
%
% unsigned int WriteMVGImage(const ImageInfo *image_info,Image *image)
%
% A description of each parameter follows.
%
% o status: Method WriteMVGImage return True if the image is written.
% False is returned is there is a memory shortage or if the image file
% fails to write.
%
% o image_info: Specifies a pointer to a ImageInfo structure.
%
% o image: A pointer to an Image structure.
%
%
*/
static unsigned int WriteMVGImage(const ImageInfo *image_info,Image *image)
{
const ImageAttribute
*attribute;
unsigned int
status;
/*
Open output image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
attribute=GetImageAttribute(image,"[MVG]");
if (attribute == (ImageAttribute *) NULL)
ThrowWriterException(CoderError,NoImageVectorGraphics,image);
status=OpenBlob(image_info,image,WriteBlobMode,&image->exception);
if (status == False)
ThrowWriterException(FileOpenError,UnableToOpenFile,image);
(void) WriteBlob(image,strlen(attribute->value),attribute->value);
CloseBlob(image);
return(True);
}