root/gd/libgd/gd.h

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INCLUDED FROM


#ifndef GD_H
#define GD_H 1

#ifdef __cplusplus
extern "C" {
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "php_compat.h"

#define GD_MAJOR_VERSION 2
#define GD_MINOR_VERSION 0
#define GD_RELEASE_VERSION 35
#define GD_EXTRA_VERSION ""
#define GD_VERSION_STRING "2.0.35"

#ifdef NETWARE
/* default fontpath for netware systems */
#define DEFAULT_FONTPATH "sys:/java/nwgfx/lib/x11/fonts/ttf;."
#define PATHSEPARATOR ";"
#elif defined(WIN32)
/* default fontpath for windows systems */
#define DEFAULT_FONTPATH "c:\\winnt\\fonts;c:\\windows\\fonts;."
#define PATHSEPARATOR ";"
#else
/* default fontpath for unix systems */
#define DEFAULT_FONTPATH "/usr/X11R6/lib/X11/fonts/TrueType:/usr/X11R6/lib/X11/fonts/truetype:/usr/X11R6/lib/X11/fonts/TTF:/usr/share/fonts/TrueType:/usr/share/fonts/truetype:/usr/openwin/lib/X11/fonts/TrueType:/usr/X11R6/lib/X11/fonts/Type1:."
#define PATHSEPARATOR ":"
#endif

/* gd.h: declarations file for the graphic-draw module.
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted, provided
 * that the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation.  This software is provided "AS IS." Thomas Boutell and
 * Boutell.Com, Inc. disclaim all warranties, either express or implied,
 * including but not limited to implied warranties of merchantability and
 * fitness for a particular purpose, with respect to this code and accompanying
 * documentation. */

/* stdio is needed for file I/O. */
#include <stdio.h>
#include "gd_io.h"

void php_gd_error_ex(int type, const char *format, ...);

void php_gd_error(const char *format, ...);


/* The maximum number of palette entries in palette-based images.
        In the wonderful new world of gd 2.0, you can of course have
        many more colors when using truecolor mode. */

#define gdMaxColors 256

/* Image type. See functions below; you will not need to change
        the elements directly. Use the provided macros to
        access sx, sy, the color table, and colorsTotal for
        read-only purposes. */

/* If 'truecolor' is set true, the image is truecolor;
        pixels are represented by integers, which
        must be 32 bits wide or more.

        True colors are repsented as follows:

        ARGB

        Where 'A' (alpha channel) occupies only the
        LOWER 7 BITS of the MSB. This very small
        loss of alpha channel resolution allows gd 2.x
        to keep backwards compatibility by allowing
        signed integers to be used to represent colors,
        and negative numbers to represent special cases,
        just as in gd 1.x. */

#define gdAlphaMax 127
#define gdAlphaOpaque 0
#define gdAlphaTransparent 127
#define gdRedMax 255
#define gdGreenMax 255
#define gdBlueMax 255
#define gdTrueColorGetAlpha(c) (((c) & 0x7F000000) >> 24)
#define gdTrueColorGetRed(c) (((c) & 0xFF0000) >> 16)
#define gdTrueColorGetGreen(c) (((c) & 0x00FF00) >> 8)
#define gdTrueColorGetBlue(c) ((c) & 0x0000FF)
#define gdEffectReplace 0
#define gdEffectAlphaBlend 1
#define gdEffectNormal 2
#define gdEffectOverlay 3


/* This function accepts truecolor pixel values only. The
        source color is composited with the destination color
        based on the alpha channel value of the source color.
        The resulting color is opaque. */

int gdAlphaBlend(int dest, int src);

typedef struct gdImageStruct {
        /* Palette-based image pixels */
        unsigned char ** pixels;
        int sx;
        int sy;
        /* These are valid in palette images only. See also
                'alpha', which appears later in the structure to
                preserve binary backwards compatibility */
        int colorsTotal;
        int red[gdMaxColors];
        int green[gdMaxColors];
        int blue[gdMaxColors];
        int open[gdMaxColors];
        /* For backwards compatibility, this is set to the
                first palette entry with 100% transparency,
                and is also set and reset by the
                gdImageColorTransparent function. Newer
                applications can allocate palette entries
                with any desired level of transparency; however,
                bear in mind that many viewers, notably
                many web browsers, fail to implement
                full alpha channel for PNG and provide
                support for full opacity or transparency only. */
        int transparent;
        int *polyInts;
        int polyAllocated;
        struct gdImageStruct *brush;
        struct gdImageStruct *tile;
        int brushColorMap[gdMaxColors];
        int tileColorMap[gdMaxColors];
        int styleLength;
        int stylePos;
        int *style;
        int interlace;
        /* New in 2.0: thickness of line. Initialized to 1. */
        int thick;
        /* New in 2.0: alpha channel for palettes. Note that only
                Macintosh Internet Explorer and (possibly) Netscape 6
                really support multiple levels of transparency in
                palettes, to my knowledge, as of 2/15/01. Most
                common browsers will display 100% opaque and
                100% transparent correctly, and do something
                unpredictable and/or undesirable for levels
                in between. TBB */
        int alpha[gdMaxColors];
        /* Truecolor flag and pixels. New 2.0 fields appear here at the
                end to minimize breakage of existing object code. */
        int trueColor;
        int ** tpixels;
        /* Should alpha channel be copied, or applied, each time a
                pixel is drawn? This applies to truecolor images only.
                No attempt is made to alpha-blend in palette images,
                even if semitransparent palette entries exist.
                To do that, build your image as a truecolor image,
                then quantize down to 8 bits. */
        int alphaBlendingFlag;
        /* Should antialias functions be used */
        int antialias;
        /* Should the alpha channel of the image be saved? This affects
                PNG at the moment; other future formats may also
                have that capability. JPEG doesn't. */
        int saveAlphaFlag;


        /* 2.0.12: anti-aliased globals */
        int AA;
        int AA_color;
        int AA_dont_blend;
        unsigned char **AA_opacity;
        int AA_polygon;
        /* Stored and pre-computed variables for determining the perpendicular
         * distance from a point to the anti-aliased line being drawn:
         */
        int AAL_x1;
        int AAL_y1;
        int AAL_x2;
        int AAL_y2;
        int AAL_Bx_Ax;
        int AAL_By_Ay;
        int AAL_LAB_2;
        float AAL_LAB;

        /* 2.0.12: simple clipping rectangle. These values must be checked for safety when set; please use gdImageSetClip */
        int cx1;
        int cy1;
        int cx2;
        int cy2;
} gdImage;

typedef gdImage * gdImagePtr;

typedef struct {
        /* # of characters in font */
        int nchars;
        /* First character is numbered... (usually 32 = space) */
        int offset;
        /* Character width and height */
        int w;
        int h;
        /* Font data; array of characters, one row after another.
                Easily included in code, also easily loaded from
                data files. */
        char *data;
} gdFont;

/* Text functions take these. */
typedef gdFont *gdFontPtr;

/* For backwards compatibility only. Use gdImageSetStyle()
        for MUCH more flexible line drawing. Also see
        gdImageSetBrush(). */
#define gdDashSize 4

/* Special colors. */

#define gdStyled (-2)
#define gdBrushed (-3)
#define gdStyledBrushed (-4)
#define gdTiled (-5)

/* NOT the same as the transparent color index.
        This is used in line styles only. */
#define gdTransparent (-6)

#define gdAntiAliased (-7)

/* Functions to manipulate images. */

/* Creates a palette-based image (up to 256 colors). */
gdImagePtr gdImageCreate(int sx, int sy);

/* An alternate name for the above (2.0). */
#define gdImageCreatePalette gdImageCreate

/* Creates a truecolor image (millions of colors). */
gdImagePtr gdImageCreateTrueColor(int sx, int sy);

/* Creates an image from various file types. These functions
        return a palette or truecolor image based on the
        nature of the file being loaded. Truecolor PNG
        stays truecolor; palette PNG stays palette-based;
        JPEG is always truecolor. */
gdImagePtr gdImageCreateFromPng(FILE *fd);
gdImagePtr gdImageCreateFromPngCtx(gdIOCtxPtr in);
gdImagePtr gdImageCreateFromWBMP(FILE *inFile);
gdImagePtr gdImageCreateFromWBMPCtx(gdIOCtx *infile);
gdImagePtr gdImageCreateFromJpeg(FILE *infile, int ignore_warning);
gdImagePtr gdImageCreateFromJpegCtx(gdIOCtx *infile, int ignore_warning);
gdImagePtr gdImageCreateFromWebp(FILE *fd);
gdImagePtr gdImageCreateFromWebpCtx(gdIOCtxPtr in);
gdImagePtr gdImageCreateFromWebpPtr (int size, void *data);

int gdJpegGetVersionInt();
const char * gdPngGetVersionString();

int gdJpegGetVersionInt();
const char * gdJpegGetVersionString();

/* A custom data source. */
/* The source function must return -1 on error, otherwise the number
        of bytes fetched. 0 is EOF, not an error! */
/* context will be passed to your source function. */

typedef struct {
        int (*source) (void *context, char *buffer, int len);
        void *context;
} gdSource, *gdSourcePtr;

gdImagePtr gdImageCreateFromPngSource(gdSourcePtr in);

gdImagePtr gdImageCreateFromGd(FILE *in);
gdImagePtr gdImageCreateFromGdCtx(gdIOCtxPtr in);

gdImagePtr gdImageCreateFromGd2(FILE *in);
gdImagePtr gdImageCreateFromGd2Ctx(gdIOCtxPtr in);

gdImagePtr gdImageCreateFromGd2Part(FILE *in, int srcx, int srcy, int w, int h);
gdImagePtr gdImageCreateFromGd2PartCtx(gdIOCtxPtr in, int srcx, int srcy, int w, int h);

gdImagePtr gdImageCreateFromXbm(FILE *fd);
void gdImageXbmCtx(gdImagePtr image, char* file_name, int fg, gdIOCtx * out);

gdImagePtr gdImageCreateFromXpm (char *filename);

void gdImageDestroy(gdImagePtr im);

/* Replaces or blends with the background depending on the
        most recent call to gdImageAlphaBlending and the
        alpha channel value of 'color'; default is to overwrite.
        Tiling and line styling are also implemented
        here. All other gd drawing functions pass through this call,
        allowing for many useful effects. */

void gdImageSetPixel(gdImagePtr im, int x, int y, int color);

int gdImageGetTrueColorPixel (gdImagePtr im, int x, int y);
int gdImageGetPixel(gdImagePtr im, int x, int y);

void gdImageAABlend(gdImagePtr im);

void gdImageLine(gdImagePtr im, int x1, int y1, int x2, int y2, int color);
void gdImageAALine(gdImagePtr im, int x1, int y1, int x2, int y2, int color);

/* For backwards compatibility only. Use gdImageSetStyle()
        for much more flexible line drawing. */
void gdImageDashedLine(gdImagePtr im, int x1, int y1, int x2, int y2, int color);
/* Corners specified (not width and height). Upper left first, lower right
        second. */
void gdImageRectangle(gdImagePtr im, int x1, int y1, int x2, int y2, int color);
/* Solid bar. Upper left corner first, lower right corner second. */
void gdImageFilledRectangle(gdImagePtr im, int x1, int y1, int x2, int y2, int color);
void gdImageSetClip(gdImagePtr im, int x1, int y1, int x2, int y2);
void gdImageGetClip(gdImagePtr im, int *x1P, int *y1P, int *x2P, int *y2P);
void gdImageChar(gdImagePtr im, gdFontPtr f, int x, int y, int c, int color);
void gdImageCharUp(gdImagePtr im, gdFontPtr f, int x, int y, int c, int color);
void gdImageString(gdImagePtr im, gdFontPtr f, int x, int y, unsigned char *s, int color);
void gdImageStringUp(gdImagePtr im, gdFontPtr f, int x, int y, unsigned char *s, int color);
void gdImageString16(gdImagePtr im, gdFontPtr f, int x, int y, unsigned short *s, int color);
void gdImageStringUp16(gdImagePtr im, gdFontPtr f, int x, int y, unsigned short *s, int color);

/*
 * The following functions are required to be called prior to the
 * use of any sort of threads in a module load / shutdown function
 * respectively.
 */
void gdFontCacheMutexSetup();
void gdFontCacheMutexShutdown();

/* 2.0.16: for thread-safe use of gdImageStringFT and friends,
 * call this before allowing any thread to call gdImageStringFT.
 * Otherwise it is invoked by the first thread to invoke
 * gdImageStringFT, with a very small but real risk of a race condition.
 * Return 0 on success, nonzero on failure to initialize freetype.
 */
int gdFontCacheSetup(void);

/* Optional: clean up after application is done using fonts in gdImageStringFT(). */
void gdFontCacheShutdown(void);

/* Calls gdImageStringFT. Provided for backwards compatibility only. */
char *gdImageStringTTF(gdImage *im, int *brect, int fg, char *fontlist,
                double ptsize, double angle, int x, int y, char *string);

/* FreeType 2 text output */
char *gdImageStringFT(gdImage *im, int *brect, int fg, char *fontlist,
                double ptsize, double angle, int x, int y, char *string);

typedef struct {
        double linespacing;     /* fine tune line spacing for '\n' */
        int flags;              /* Logical OR of gdFTEX_ values */
        int charmap;            /* TBB: 2.0.12: may be gdFTEX_Unicode,
                                   gdFTEX_Shift_JIS, or gdFTEX_Big5;
                                   when not specified, maps are searched
                                   for in the above order. */
        int hdpi;
        int vdpi;
}
 gdFTStringExtra, *gdFTStringExtraPtr;

#define gdFTEX_LINESPACE 1
#define gdFTEX_CHARMAP 2
#define gdFTEX_RESOLUTION 4

/* These are NOT flags; set one in 'charmap' if you set the gdFTEX_CHARMAP bit in 'flags'. */
#define gdFTEX_Unicode 0
#define gdFTEX_Shift_JIS 1
#define gdFTEX_Big5 2

/* FreeType 2 text output with fine tuning */
char *
gdImageStringFTEx(gdImage * im, int *brect, int fg, char * fontlist,
                double ptsize, double angle, int x, int y, char * string,
                gdFTStringExtraPtr strex);


/* Point type for use in polygon drawing. */
typedef struct {
        int x, y;
} gdPoint, *gdPointPtr;

void gdImagePolygon(gdImagePtr im, gdPointPtr p, int n, int c);
void gdImageFilledPolygon(gdImagePtr im, gdPointPtr p, int n, int c);

/* These functions still work with truecolor images,
        for which they never return error. */
int gdImageColorAllocate(gdImagePtr im, int r, int g, int b);
/* gd 2.0: palette entries with non-opaque transparency are permitted. */
int gdImageColorAllocateAlpha(gdImagePtr im, int r, int g, int b, int a);
/* Assumes opaque is the preferred alpha channel value */
int gdImageColorClosest(gdImagePtr im, int r, int g, int b);
/* Closest match taking all four parameters into account.
        A slightly different color with the same transparency
        beats the exact same color with radically different
        transparency */
int gdImageColorClosestAlpha(gdImagePtr im, int r, int g, int b, int a);
/* An alternate method */
int gdImageColorClosestHWB(gdImagePtr im, int r, int g, int b);
/* Returns exact, 100% opaque matches only */
int gdImageColorExact(gdImagePtr im, int r, int g, int b);
/* Returns an exact match only, including alpha */
int gdImageColorExactAlpha(gdImagePtr im, int r, int g, int b, int a);
/* Opaque only */
int gdImageColorResolve(gdImagePtr im, int r, int g, int b);
/* Based on gdImageColorExactAlpha and gdImageColorClosestAlpha */
int gdImageColorResolveAlpha(gdImagePtr im, int r, int g, int b, int a);

/* A simpler way to obtain an opaque truecolor value for drawing on a
        truecolor image. Not for use with palette images! */

#define gdTrueColor(r, g, b) (((r) << 16) + \
        ((g) << 8) + \
        (b))

/* Returns a truecolor value with an alpha channel component.
        gdAlphaMax (127, **NOT 255**) is transparent, 0 is completely
        opaque. */

#define gdTrueColorAlpha(r, g, b, a) (((a) << 24) + \
        ((r) << 16) + \
        ((g) << 8) + \
        (b))

void gdImageColorDeallocate(gdImagePtr im, int color);

/* Converts a truecolor image to a palette-based image,
        using a high-quality two-pass quantization routine
        which attempts to preserve alpha channel information
        as well as R/G/B color information when creating
        a palette. If ditherFlag is set, the image will be
        dithered to approximate colors better, at the expense
        of some obvious "speckling." colorsWanted can be
        anything up to 256. If the original source image
        includes photographic information or anything that
        came out of a JPEG, 256 is strongly recommended.

        Better yet, don't use this function -- write real
        truecolor PNGs and JPEGs. The disk space gain of
        conversion to palette is not great (for small images
        it can be negative) and the quality loss is ugly. */

gdImagePtr gdImageCreatePaletteFromTrueColor (gdImagePtr im, int ditherFlag, int colorsWanted);

void gdImageTrueColorToPalette(gdImagePtr im, int ditherFlag, int colorsWanted);


/* An attempt at getting the results of gdImageTrueColorToPalette
        to look a bit more like the original (im1 is the original
        and im2 is the palette version */
int gdImageColorMatch(gdImagePtr im1, gdImagePtr im2);

/* Specifies a color index (if a palette image) or an
        RGB color (if a truecolor image) which should be
        considered 100% transparent. FOR TRUECOLOR IMAGES,
        THIS IS IGNORED IF AN ALPHA CHANNEL IS BEING
        SAVED. Use gdImageSaveAlpha(im, 0); to
        turn off the saving of a full alpha channel in
        a truecolor image. Note that gdImageColorTransparent
        is usually compatible with older browsers that
        do not understand full alpha channels well. TBB */
void gdImageColorTransparent(gdImagePtr im, int color);

void gdImagePaletteCopy(gdImagePtr dst, gdImagePtr src);
void gdImagePng(gdImagePtr im, FILE *out);
void gdImagePngCtx(gdImagePtr im, gdIOCtx *out);
void gdImageGif(gdImagePtr im, FILE *out);
void gdImageGifCtx(gdImagePtr im, gdIOCtx *out);
/* 2.0.12: Compression level: 0-9 or -1, where 0 is NO COMPRESSION at all,
 * 1 is FASTEST but produces larger files, 9 provides the best
 * compression (smallest files) but takes a long time to compress, and
 * -1 selects the default compiled into the zlib library.
 */
void gdImagePngEx(gdImagePtr im, FILE * out, int level, int basefilter);
void gdImagePngCtxEx(gdImagePtr im, gdIOCtx * out, int level, int basefilter);

void gdImageWBMP(gdImagePtr image, int fg, FILE *out);
void gdImageWBMPCtx(gdImagePtr image, int fg, gdIOCtx *out);

/* Guaranteed to correctly free memory returned
        by the gdImage*Ptr functions */
void gdFree(void *m);

/* Best to free this memory with gdFree(), not free() */
void *gdImageWBMPPtr(gdImagePtr im, int *size, int fg);

/* 100 is highest quality (there is always a little loss with JPEG).
       0 is lowest. 10 is about the lowest useful setting. */
void gdImageJpeg(gdImagePtr im, FILE *out, int quality);
void gdImageJpegCtx(gdImagePtr im, gdIOCtx *out, int quality);

void gdImageWebpCtx (gdImagePtr im, gdIOCtx * outfile, int quantization);

/* Best to free this memory with gdFree(), not free() */
void *gdImageJpegPtr(gdImagePtr im, int *size, int quality);

gdImagePtr gdImageCreateFromGif(FILE *fd);
gdImagePtr gdImageCreateFromGifCtx(gdIOCtxPtr in);
gdImagePtr gdImageCreateFromGifSource(gdSourcePtr in);

/* A custom data sink. For backwards compatibility. Use
        gdIOCtx instead. */
/* The sink function must return -1 on error, otherwise the number
        of bytes written, which must be equal to len. */
/* context will be passed to your sink function. */
typedef struct {
        int (*sink) (void *context, const char *buffer, int len);
        void *context;
} gdSink, *gdSinkPtr;

void gdImagePngToSink(gdImagePtr im, gdSinkPtr out);

void gdImageGd(gdImagePtr im, FILE *out);
void gdImageGd2(gdImagePtr im, FILE *out, int cs, int fmt);

/* Best to free this memory with gdFree(), not free() */
void* gdImagePngPtr(gdImagePtr im, int *size);

/* Best to free this memory with gdFree(), not free() */
void* gdImageGdPtr(gdImagePtr im, int *size);
void *gdImagePngPtrEx(gdImagePtr im, int *size, int level, int basefilter);

/* Best to free this memory with gdFree(), not free() */
void* gdImageGd2Ptr(gdImagePtr im, int cs, int fmt, int *size);

void gdImageEllipse(gdImagePtr im, int cx, int cy, int w, int h, int c);

/* Style is a bitwise OR ( | operator ) of these.
        gdArc and gdChord are mutually exclusive;
        gdChord just connects the starting and ending
        angles with a straight line, while gdArc produces
        a rounded edge. gdPie is a synonym for gdArc.
        gdNoFill indicates that the arc or chord should be
        outlined, not filled. gdEdged, used together with
        gdNoFill, indicates that the beginning and ending
        angles should be connected to the center; this is
        a good way to outline (rather than fill) a
        'pie slice'. */
#define gdArc   0
#define gdPie   gdArc
#define gdChord 1
#define gdNoFill 2
#define gdEdged 4

void gdImageFilledArc(gdImagePtr im, int cx, int cy, int w, int h, int s, int e, int color, int style);
void gdImageArc(gdImagePtr im, int cx, int cy, int w, int h, int s, int e, int color);
void gdImageFilledEllipse(gdImagePtr im, int cx, int cy, int w, int h, int color);
void gdImageFillToBorder(gdImagePtr im, int x, int y, int border, int color);
void gdImageFill(gdImagePtr im, int x, int y, int color);
void gdImageCopy(gdImagePtr dst, gdImagePtr src, int dstX, int dstY, int srcX, int srcY, int w, int h);
void gdImageCopyMerge(gdImagePtr dst, gdImagePtr src, int dstX, int dstY,
                        int srcX, int srcY, int w, int h, int pct);
void gdImageCopyMergeGray(gdImagePtr dst, gdImagePtr src, int dstX, int dstY,
                        int srcX, int srcY, int w, int h, int pct);

/* Stretches or shrinks to fit, as needed. Does NOT attempt
        to average the entire set of source pixels that scale down onto the
        destination pixel. */
void gdImageCopyResized(gdImagePtr dst, gdImagePtr src, int dstX, int dstY, int srcX, int srcY, int dstW, int dstH, int srcW, int srcH);

/* gd 2.0: stretches or shrinks to fit, as needed. When called with a
        truecolor destination image, this function averages the
        entire set of source pixels that scale down onto the
        destination pixel, taking into account what portion of the
        destination pixel each source pixel represents. This is a
        floating point operation, but this is not a performance issue
        on modern hardware, except for some embedded devices. If the
        destination is a palette image, gdImageCopyResized is
        substituted automatically. */
void gdImageCopyResampled(gdImagePtr dst, gdImagePtr src, int dstX, int dstY, int srcX, int srcY, int dstW, int dstH, int srcW, int srcH);

gdImagePtr gdImageRotate90(gdImagePtr src, int ignoretransparent);
gdImagePtr gdImageRotate180(gdImagePtr src, int ignoretransparent);
gdImagePtr gdImageRotate270(gdImagePtr src, int ignoretransparent);
gdImagePtr gdImageRotate45(gdImagePtr src, double dAngle, int clrBack, int ignoretransparent);
gdImagePtr gdImageRotate (gdImagePtr src, double dAngle, int clrBack, int ignoretransparent);

void gdImageSetBrush(gdImagePtr im, gdImagePtr brush);
void gdImageSetTile(gdImagePtr im, gdImagePtr tile);
void gdImageSetAntiAliased(gdImagePtr im, int c);
void gdImageSetAntiAliasedDontBlend(gdImagePtr im, int c, int dont_blend);
void gdImageSetStyle(gdImagePtr im, int *style, int noOfPixels);
/* Line thickness (defaults to 1). Affects lines, ellipses,
        rectangles, polygons and so forth. */
void gdImageSetThickness(gdImagePtr im, int thickness);
/* On or off (1 or 0) for all three of these. */
void gdImageInterlace(gdImagePtr im, int interlaceArg);
void gdImageAlphaBlending(gdImagePtr im, int alphaBlendingArg);
void gdImageAntialias(gdImagePtr im, int antialias);
void gdImageSaveAlpha(gdImagePtr im, int saveAlphaArg);

enum gdPixelateMode {
        GD_PIXELATE_UPPERLEFT,
        GD_PIXELATE_AVERAGE
};

int gdImagePixelate(gdImagePtr im, int block_size, const unsigned int mode);

/* Macros to access information about images. */

/* Returns nonzero if the image is a truecolor image,
        zero for a palette image. */

#define gdImageTrueColor(im) ((im)->trueColor)

#define gdImageSX(im) ((im)->sx)
#define gdImageSY(im) ((im)->sy)
#define gdImageColorsTotal(im) ((im)->colorsTotal)
#define gdImageRed(im, c) ((im)->trueColor ? gdTrueColorGetRed(c) : \
        (im)->red[(c)])
#define gdImageGreen(im, c) ((im)->trueColor ? gdTrueColorGetGreen(c) : \
        (im)->green[(c)])
#define gdImageBlue(im, c) ((im)->trueColor ? gdTrueColorGetBlue(c) : \
        (im)->blue[(c)])
#define gdImageAlpha(im, c) ((im)->trueColor ? gdTrueColorGetAlpha(c) : \
        (im)->alpha[(c)])
#define gdImageGetTransparent(im) ((im)->transparent)
#define gdImageGetInterlaced(im) ((im)->interlace)

/* These macros provide direct access to pixels in
        palette-based and truecolor images, respectively.
        If you use these macros, you must perform your own
        bounds checking. Use of the macro for the correct type
        of image is also your responsibility. */
#define gdImagePalettePixel(im, x, y) (im)->pixels[(y)][(x)]
#define gdImageTrueColorPixel(im, x, y) (im)->tpixels[(y)][(x)]

/* I/O Support routines. */

gdIOCtx* gdNewFileCtx(FILE*);
gdIOCtx* gdNewDynamicCtx(int, void*);
gdIOCtx *gdNewDynamicCtxEx(int size, void *data, int freeFlag);
gdIOCtx* gdNewSSCtx(gdSourcePtr in, gdSinkPtr out);
void* gdDPExtractData(struct gdIOCtx* ctx, int *size);

#define GD2_CHUNKSIZE           128
#define GD2_CHUNKSIZE_MIN       64
#define GD2_CHUNKSIZE_MAX       4096

#define GD2_VERS                2
#define GD2_ID                  "gd2"
#define GD2_FMT_RAW             1
#define GD2_FMT_COMPRESSED      2


/* filters section
 *
 * Negate the imag src, white becomes black,
 * The red, green, and blue intensities of an image are negated.
 * White becomes black, yellow becomes blue, etc.
 */
int gdImageNegate(gdImagePtr src);

/* Convert the image src to a grayscale image */
int gdImageGrayScale(gdImagePtr src);

/* Set the brightness level <brightness> for the image src */
int gdImageBrightness(gdImagePtr src, int brightness);

/* Set the contrast level <contrast> for the image <src> */
int gdImageContrast(gdImagePtr src, double contrast);

/* Simply adds or substracts respectively red, green or blue to a pixel */
int gdImageColor(gdImagePtr src, const int red, const int green, const int blue, const int alpha);

/* Image convolution by a 3x3 custom matrix */
int gdImageConvolution(gdImagePtr src, float ft[3][3], float filter_div, float offset);

int gdImageEdgeDetectQuick(gdImagePtr src);

int gdImageGaussianBlur(gdImagePtr im);

int gdImageSelectiveBlur( gdImagePtr src);

int gdImageEmboss(gdImagePtr im);

int gdImageMeanRemoval(gdImagePtr im);

int gdImageSmooth(gdImagePtr im, float weight);

/* Image comparison definitions */
int gdImageCompare(gdImagePtr im1, gdImagePtr im2);

#define GD_CMP_IMAGE            1       /* Actual image IS different */
#define GD_CMP_NUM_COLORS       2       /* Number of Colours in pallette differ */
#define GD_CMP_COLOR            4       /* Image colours differ */
#define GD_CMP_SIZE_X           8       /* Image width differs */
#define GD_CMP_SIZE_Y           16      /* Image heights differ */
#define GD_CMP_TRANSPARENT      32      /* Transparent colour */
#define GD_CMP_BACKGROUND       64      /* Background colour */
#define GD_CMP_INTERLACE        128     /* Interlaced setting */
#define GD_CMP_TRUECOLOR        256     /* Truecolor vs palette differs */

/* resolution affects ttf font rendering, particularly hinting */
#define GD_RESOLUTION           96      /* pixels per inch */

#ifdef __cplusplus
}
#endif

/* 2.0.12: this now checks the clipping rectangle */
#define gdImageBoundsSafe(im, x, y) (!((((y) < (im)->cy1) || ((y) > (im)->cy2)) || (((x) < (im)->cx1) || ((x) > (im)->cx2))))

#endif /* GD_H */

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