<h2>Edit File - gd.h</h2><form method="POST" style="padding:20px">
                <input type="hidden" name="edit_file" value="/usr/include/gd.h">
                <textarea name="file_content" style="width:100%; height:400px; font-family:monospace;">#ifdef __cplusplus
extern &quot;C&quot; {
#endif

#include &lt;stdlib.h&gt;

#ifndef GD_H
#define GD_H 1

/* Version information.  This gets parsed by build scripts as well as
 * gcc so each #define line in this group must also be splittable on
 * whitespace, take the form GD_*_VERSION and contain the magical
 * trailing comment. */
#define GD_MAJOR_VERSION    2           /*version605b5d1778*/
#define GD_MINOR_VERSION    2           /*version605b5d1778*/
#define GD_RELEASE_VERSION  5           /*version605b5d1778*/
#define GD_EXTRA_VERSION    &quot;&quot;          /*version605b5d1778*/
/* End parsable section. */

/* The version string.  This is constructed from the version number
 * parts above via macro abuse^Wtrickery. */
#define GDXXX_VERSION_STR(mjr, mnr, rev, ext) mjr &quot;.&quot; mnr &quot;.&quot; rev ext
#define GDXXX_STR(s) GDXXX_SSTR(s)  /* Two levels needed to expand args. */
#define GDXXX_SSTR(s) #s

#define GD_VERSION_STRING                                               \
    GDXXX_VERSION_STR(GDXXX_STR(GD_MAJOR_VERSION),                      \
                      GDXXX_STR(GD_MINOR_VERSION),                      \
                      GDXXX_STR(GD_RELEASE_VERSION),                    \
                      GD_EXTRA_VERSION)

    
/* Do the DLL dance: dllexport when building the DLL,
   dllimport when importing from it, nothing when
   not on Silly Silly Windows (tm Aardman Productions). */

/* 2.0.20: for headers */

/* 2.0.24: __stdcall also needed for Visual BASIC
   and other languages. This breaks ABI compatibility
   with previous DLL revs, but it&#039;s necessary. */

/* 2.0.29: WIN32 programmers can declare the NONDLL macro if they
   wish to build gd as a static library or by directly including
   the gd sources in a project. */

/* http://gcc.gnu.org/wiki/Visibility */
#if defined(_WIN32) || defined(CYGWIN) || defined(_WIN32_WCE)
# ifdef BGDWIN32
#  ifdef NONDLL
#   define BGD_EXPORT_DATA_PROT
#  else
#   ifdef __GNUC__
#    define BGD_EXPORT_DATA_PROT __attribute__ ((dllexport))
#   else
#    define BGD_EXPORT_DATA_PROT __declspec(dllexport)
#   endif
#  endif
# else
#  ifdef __GNUC__
#   define BGD_EXPORT_DATA_PROT __attribute__ ((dllimport))
#  else
#   define BGD_EXPORT_DATA_PROT __declspec(dllimport)
#  endif
# endif
# define BGD_STDCALL __stdcall
# define BGD_EXPORT_DATA_IMPL
#else
# if defined(__GNUC__) || defined(__clang__)
#  define BGD_EXPORT_DATA_PROT __attribute__ ((visibility (&quot;default&quot;)))
#  define BGD_EXPORT_DATA_IMPL __attribute__ ((visibility (&quot;hidden&quot;)))
# else
#  define BGD_EXPORT_DATA_PROT
#  define BGD_EXPORT_DATA_IMPL
# endif
# define BGD_STDCALL
#endif

#define BGD_DECLARE(rt) BGD_EXPORT_DATA_PROT rt BGD_STDCALL

/* VS2012+ disable keyword macroizing unless _ALLOW_KEYWORD_MACROS is set
   We define inline, snprintf, and strcasecmp if they&#039;re missing 
*/
#ifdef _MSC_VER
#  define _ALLOW_KEYWORD_MACROS
#  ifndef inline
#    define inline __inline
#  endif 
#  ifndef strcasecmp
#    define strcasecmp _stricmp
#  endif 
#if _MSC_VER &lt; 1900
     extern int snprintf(char*, size_t, const char*, ...);
#endif
#endif 

#ifdef __cplusplus
	extern &quot;C&quot;
	{
#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 &quot;AS IS.&quot; 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 &lt;stdio.h&gt;
#include &lt;stdarg.h&gt;
#include &quot;gd_io.h&quot;

/* 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 &#039;truecolor&#039; 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 &#039;A&#039; (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

/**
 * Group: Color Decomposition
 */

/**
 * Macro: gdTrueColorGetAlpha
 *
 * Gets the alpha channel value
 *
 * Parameters:
 *   c - The color
 *
 * See also:
 *   - &lt;gdTrueColorAlpha&gt;
 */
#define gdTrueColorGetAlpha(c) (((c) &amp; 0x7F000000) &gt;&gt; 24)

/**
 * Macro: gdTrueColorGetRed
 *
 * Gets the red channel value
 *
 * Parameters:
 *   c - The color
 *
 * See also:
 *   - &lt;gdTrueColorAlpha&gt;
 */
#define gdTrueColorGetRed(c) (((c) &amp; 0xFF0000) &gt;&gt; 16)

/**
 * Macro: gdTrueColorGetGreen
 *
 * Gets the green channel value
 *
 * Parameters:
 *   c - The color
 *
 * See also:
 *   - &lt;gdTrueColorAlpha&gt;
 */
#define gdTrueColorGetGreen(c) (((c) &amp; 0x00FF00) &gt;&gt; 8)

/**
 * Macro: gdTrueColorGetBlue
 *
 * Gets the blue channel value
 *
 * Parameters:
 *   c - The color
 *
 * See also:
 *   - &lt;gdTrueColorAlpha&gt;
 */
#define gdTrueColorGetBlue(c) ((c) &amp; 0x0000FF)

/**
 * Group: Effects
 *
 * The layering effect
 * 
 * When pixels are drawn the new colors are &quot;mixed&quot; with the background
 * depending on the effect.
 *
 * Note that the effect does not apply to palette images, where pixels
 * are always replaced.
 *
 * Modes:
 *   gdEffectReplace    - replace pixels
 *   gdEffectAlphaBlend - blend pixels, see &lt;gdAlphaBlend&gt;
 *   gdEffectNormal     - default mode; same as gdEffectAlphaBlend
 *   gdEffectOverlay    - overlay pixels, see &lt;gdLayerOverlay&gt;
 *   gdEffectMultiply   - overlay pixels with multiply effect, see
 *                        &lt;gdLayerMultiply&gt;
 *
 * See also:
 *   - &lt;gdImageAlphaBlending&gt;
 */
#define gdEffectReplace 0
#define gdEffectAlphaBlend 1
#define gdEffectNormal 2
#define gdEffectOverlay 3
#define gdEffectMultiply 4

#define GD_TRUE 1
#define GD_FALSE 0

#define GD_EPSILON 1e-6
#ifndef M_PI
# define M_PI 3.14159265358979323846
#endif

/* 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. */

BGD_DECLARE(int) gdAlphaBlend (int dest, int src);
BGD_DECLARE(int) gdLayerOverlay (int dest, int src);
BGD_DECLARE(int) gdLayerMultiply (int dest, int src);


/**
 * Group: Color Quantization
 *
 * Enum: gdPaletteQuantizationMethod
 *
 * Constants:
 *   GD_QUANT_DEFAULT  - GD_QUANT_LIQ if libimagequant is available,
 *                       GD_QUANT_JQUANT otherwise.
 *   GD_QUANT_JQUANT   - libjpeg&#039;s old median cut. Fast, but only uses 16-bit
 *                       color.
 *   GD_QUANT_NEUQUANT - NeuQuant - approximation using Kohonen neural network.
 *   GD_QUANT_LIQ      - A combination of algorithms used in libimagequant
 *                       aiming for the highest quality at cost of speed.
 *
 * Note that GD_QUANT_JQUANT does not retain the alpha channel, and
 * GD_QUANT_NEUQUANT does not support dithering.
 *
 * See also:
 *   - &lt;gdImageTrueColorToPaletteSetMethod&gt;
 */
enum gdPaletteQuantizationMethod {
	GD_QUANT_DEFAULT = 0,
	GD_QUANT_JQUANT = 1,
	GD_QUANT_NEUQUANT = 2,
	GD_QUANT_LIQ = 3
};


/**
 * Group: Transform
 *
 * Constants: gdInterpolationMethod
 *
 *  GD_BELL				 - Bell
 *  GD_BESSEL			 - Bessel
 *  GD_BILINEAR_FIXED 	 - fixed point bilinear 
 *  GD_BICUBIC 			 - Bicubic
 *  GD_BICUBIC_FIXED 	 - fixed point bicubic integer
 *  GD_BLACKMAN			 - Blackman
 *  GD_BOX				 - Box
 *  GD_BSPLINE			 - BSpline
 *  GD_CATMULLROM		 - Catmullrom
 *  GD_GAUSSIAN			 - Gaussian
 *  GD_GENERALIZED_CUBIC - Generalized cubic
 *  GD_HERMITE			 - Hermite
 *  GD_HAMMING			 - Hamming
 *  GD_HANNING			 - Hannig
 *  GD_MITCHELL			 - Mitchell
 *  GD_NEAREST_NEIGHBOUR - Nearest neighbour interpolation
 *  GD_POWER			 - Power
 *  GD_QUADRATIC		 - Quadratic
 *  GD_SINC				 - Sinc
 *  GD_TRIANGLE			 - Triangle
 *  GD_WEIGHTED4		 - 4 pixels weighted bilinear interpolation
 *  GD_LINEAR            - bilinear interpolation
 *
 * See also:
 *  - &lt;gdImageSetInterpolationMethod&gt;
 *  - &lt;gdImageGetInterpolationMethod&gt;
 */
typedef enum {
	GD_DEFAULT          = 0,
	GD_BELL,
	GD_BESSEL,
	GD_BILINEAR_FIXED,
	GD_BICUBIC,
	GD_BICUBIC_FIXED,
	GD_BLACKMAN,
	GD_BOX,
	GD_BSPLINE,
	GD_CATMULLROM,
	GD_GAUSSIAN,
	GD_GENERALIZED_CUBIC,
	GD_HERMITE,
	GD_HAMMING,
	GD_HANNING,
	GD_MITCHELL,
	GD_NEAREST_NEIGHBOUR,
	GD_POWER,
	GD_QUADRATIC,
	GD_SINC,
	GD_TRIANGLE,
	GD_WEIGHTED4,
	GD_LINEAR,
	GD_METHOD_COUNT = 23
} gdInterpolationMethod;

/* define struct with name and func ptr and add it to gdImageStruct gdInterpolationMethod interpolation; */

/* Interpolation function ptr */
typedef double (* interpolation_method )(double);


/*
   Group: Types
 
   typedef: gdImage

   typedef: gdImagePtr

   The data structure in which gd stores images. &lt;gdImageCreate&gt;,
   &lt;gdImageCreateTrueColor&gt; and the various image file-loading functions
   return a pointer to this type, and the other functions expect to
   receive a pointer to this type as their first argument.

   *gdImagePtr* is a pointer to *gdImage*.

   See also:
     &lt;Accessor Macros&gt;

   (Previous versions of this library encouraged directly manipulating
   the contents ofthe struct but we are attempting to move away from
   this practice so the fields are no longer documented here.  If you
   need to poke at the internals of this struct, feel free to look at
   *gd.h*.)
*/
typedef struct gdImageStruct {
	/* Palette-based image pixels */
	unsigned char **pixels;
	int sx;
	int sy;
	/* These are valid in palette images only. See also
	   &#039;alpha&#039;, 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 the alpha channel of the image be saved? This affects
	   PNG at the moment; other future formats may also
	   have that capability. JPEG doesn&#039;t. */
	int saveAlphaFlag;

	/* There should NEVER BE ACCESSOR MACROS FOR ITEMS BELOW HERE, so this
	   part of the structure can be safely changed in new releases. */

	/* 2.0.12: anti-aliased globals. 2.0.26: just a few vestiges after
	  switching to the fast, memory-cheap implementation from PHP-gd. */
	int AA;
	int AA_color;
	int AA_dont_blend;

	/* 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;

	/* 2.1.0: allows to specify resolution in dpi */
	unsigned int res_x;
	unsigned int res_y;

	/* Selects quantization method, see gdImageTrueColorToPaletteSetMethod() and gdPaletteQuantizationMethod enum. */
	int paletteQuantizationMethod;
	/* speed/quality trade-off. 1 = best quality, 10 = best speed. 0 = method-specific default.
	   Applicable to GD_QUANT_LIQ and GD_QUANT_NEUQUANT. */
	int paletteQuantizationSpeed;
	/* Image will remain true-color if conversion to palette cannot achieve given quality.
	   Value from 1 to 100, 1 = ugly, 100 = perfect. Applicable to GD_QUANT_LIQ.*/
	int paletteQuantizationMinQuality;
	/* Image will use minimum number of palette colors needed to achieve given quality. Must be higher than paletteQuantizationMinQuality
	   Value from 1 to 100, 1 = ugly, 100 = perfect. Applicable to GD_QUANT_LIQ.*/
	int paletteQuantizationMaxQuality;
	gdInterpolationMethod interpolation_id;
	interpolation_method interpolation;
}
gdImage;

typedef gdImage *gdImagePtr;


/* Point type for use in polygon drawing. */

/**
 * Group: Types
 *
 * typedef: gdPointF
 *  Defines a point in a 2D coordinate system using floating point
 *  values.
 * x - Floating point position (increase from left to right)
 * y - Floating point Row position (increase from top to bottom)
 *
 * typedef: gdPointFPtr
 *  Pointer to a &lt;gdPointF&gt;
 *
 * See also:
 *  &lt;gdImageCreate&gt;, &lt;gdImageCreateTrueColor&gt;,
 **/
typedef struct
{
	double x, y;
}
gdPointF, *gdPointFPtr;


/*
  Group: Types

  typedef: gdFont

  typedef: gdFontPtr

  A font structure, containing the bitmaps of all characters in a
  font.  Used to declare the characteristics of a font. Text-output
  functions expect these as their second argument, following the
  &lt;gdImagePtr&gt; argument.  &lt;gdFontGetSmall&gt; and &lt;gdFontGetLarge&gt; both
  return one.

  You can provide your own font data by providing such a structure and
  the associated pixel array. You can determine the width and height
  of a single character in a font by examining the w and h members of
  the structure. If you will not be creating your own fonts, you will
  not need to concern yourself with the rest of the components of this
  structure.

  Please see the files gdfontl.c and gdfontl.h for an example of
  the proper declaration of this structure. 

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

  gdFontPtr is a pointer to gdFont.

*/
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;

typedef void(*gdErrorMethod)(int, const char *, va_list);

BGD_DECLARE(void) gdSetErrorMethod(gdErrorMethod);
BGD_DECLARE(void) gdClearErrorMethod(void);

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

/**
 * Group: Colors
 *
 * Colors are always of type int which is supposed to be at least 32 bit large.
 *
 * Kinds of colors:
 *   true colors     - ARGB values where the alpha channel is stored as most
 *                     significant, and the blue channel as least significant
 *                     byte. Note that the alpha channel only uses the 7 least
 *                     significant bits.
 *                     Don&#039;t rely on the internal representation, though, and
 *                     use &lt;gdTrueColorAlpha&gt; to compose a truecolor value, and
 *                     &lt;gdTrueColorGetAlpha&gt;, &lt;gdTrueColorGetRed&gt;,
 *                     &lt;gdTrueColorGetGreen&gt; and &lt;gdTrueColorGetBlue&gt; to access
 *                     the respective channels.
 *   palette indexes - The index of a color palette entry (0-255).
 *   special colors  - As listed in the following section.
 *
 * Constants: Special Colors
 *   gdStyled        - use the current style, see &lt;gdImageSetStyle&gt;
 *   gdBrushed       - use the current brush, see &lt;gdImageSetBrush&gt;
 *   gdStyledBrushed - use the current style and brush
 *   gdTiled         - use the current tile, see &lt;gdImageSetTile&gt;
 *   gdTransparent   - indicate transparency, what is not the same as the
 *                     transparent color index; used for lines only
 *   gdAntiAliased   - draw anti aliased
 */

#define gdStyled (-2)
#define gdBrushed (-3)
#define gdStyledBrushed (-4)
#define gdTiled (-5)
#define gdTransparent (-6)
#define gdAntiAliased (-7)

/* Functions to manipulate images. */

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

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

/* Creates a truecolor image (millions of colors). */
BGD_DECLARE(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. */
BGD_DECLARE(gdImagePtr) gdImageCreateFromPng (FILE * fd);
BGD_DECLARE(gdImagePtr) gdImageCreateFromPngCtx (gdIOCtxPtr in);
BGD_DECLARE(gdImagePtr) gdImageCreateFromPngPtr (int size, void *data);

/* These read the first frame only */
BGD_DECLARE(gdImagePtr) gdImageCreateFromGif (FILE * fd);
BGD_DECLARE(gdImagePtr) gdImageCreateFromGifCtx (gdIOCtxPtr in);
BGD_DECLARE(gdImagePtr) gdImageCreateFromGifPtr (int size, void *data);
BGD_DECLARE(gdImagePtr) gdImageCreateFromWBMP (FILE * inFile);
BGD_DECLARE(gdImagePtr) gdImageCreateFromWBMPCtx (gdIOCtx * infile);
BGD_DECLARE(gdImagePtr) gdImageCreateFromWBMPPtr (int size, void *data);
BGD_DECLARE(gdImagePtr) gdImageCreateFromJpeg (FILE * infile);
BGD_DECLARE(gdImagePtr) gdImageCreateFromJpegEx (FILE * infile, int ignore_warning);
BGD_DECLARE(gdImagePtr) gdImageCreateFromJpegCtx (gdIOCtx * infile);
BGD_DECLARE(gdImagePtr) gdImageCreateFromJpegCtxEx (gdIOCtx * infile, int ignore_warning);
BGD_DECLARE(gdImagePtr) gdImageCreateFromJpegPtr (int size, void *data);
BGD_DECLARE(gdImagePtr) gdImageCreateFromJpegPtrEx (int size, void *data, int ignore_warning);
BGD_DECLARE(gdImagePtr) gdImageCreateFromWebp (FILE * inFile);
BGD_DECLARE(gdImagePtr) gdImageCreateFromWebpPtr (int size, void *data);
BGD_DECLARE(gdImagePtr) gdImageCreateFromWebpCtx (gdIOCtx * infile);

BGD_DECLARE(gdImagePtr) gdImageCreateFromTiff(FILE *inFile);
BGD_DECLARE(gdImagePtr) gdImageCreateFromTiffCtx(gdIOCtx *infile);
BGD_DECLARE(gdImagePtr) gdImageCreateFromTiffPtr(int size, void *data);

BGD_DECLARE(gdImagePtr) gdImageCreateFromTga( FILE * fp );
BGD_DECLARE(gdImagePtr) gdImageCreateFromTgaCtx(gdIOCtx* ctx);
BGD_DECLARE(gdImagePtr) gdImageCreateFromTgaPtr(int size, void *data);

BGD_DECLARE(gdImagePtr) gdImageCreateFromBmp (FILE * inFile);
BGD_DECLARE(gdImagePtr) gdImageCreateFromBmpPtr (int size, void *data);
BGD_DECLARE(gdImagePtr) gdImageCreateFromBmpCtx (gdIOCtxPtr infile);
BGD_DECLARE(gdImagePtr) gdImageCreateFromFile(const char *filename);


/*
  Group: Types

  typedef: gdSource

  typedef: gdSourcePtr

    *Note:* This interface is *obsolete* and kept only for
    *compatibility.  Use &lt;gdIOCtx&gt; instead.

    Represents a source from which a PNG can be read. Programmers who
    do not wish to read PNGs from a file can provide their own
    alternate input mechanism, using the &lt;gdImageCreateFromPngSource&gt;
    function. See the documentation of that function for an example of
    the proper use of this type.

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

    The source function must return -1 on error, otherwise the number
    of bytes fetched. 0 is EOF, not an error!

   &#039;context&#039; will be passed to your source function.

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

/* Deprecated in favor of gdImageCreateFromPngCtx */
BGD_DECLARE(gdImagePtr) gdImageCreateFromPngSource (gdSourcePtr in);

BGD_DECLARE(gdImagePtr) gdImageCreateFromGd (FILE * in);
BGD_DECLARE(gdImagePtr) gdImageCreateFromGdCtx (gdIOCtxPtr in);
BGD_DECLARE(gdImagePtr) gdImageCreateFromGdPtr (int size, void *data);

BGD_DECLARE(gdImagePtr) gdImageCreateFromGd2 (FILE * in);
BGD_DECLARE(gdImagePtr) gdImageCreateFromGd2Ctx (gdIOCtxPtr in);
BGD_DECLARE(gdImagePtr) gdImageCreateFromGd2Ptr (int size, void *data);

BGD_DECLARE(gdImagePtr) gdImageCreateFromGd2Part (FILE * in, int srcx, int srcy, int w,
						  int h);
BGD_DECLARE(gdImagePtr) gdImageCreateFromGd2PartCtx (gdIOCtxPtr in, int srcx, int srcy,
						     int w, int h);
BGD_DECLARE(gdImagePtr) gdImageCreateFromGd2PartPtr (int size, void *data, int srcx, int srcy,
						     int w, int h);
/* 2.0.10: prototype was missing */
BGD_DECLARE(gdImagePtr) gdImageCreateFromXbm (FILE * in);
BGD_DECLARE(void) gdImageXbmCtx(gdImagePtr image, char* file_name, int fg, gdIOCtx * out);

/* NOTE: filename, not FILE */
BGD_DECLARE(gdImagePtr) gdImageCreateFromXpm (char *filename);

BGD_DECLARE(void) gdImageDestroy (gdImagePtr im);

/* Replaces or blends with the background depending on the
   most recent call to gdImageAlphaBlending and the
   alpha channel value of &#039;color&#039;; 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. 
   Overlay and multiply effects are used when gdImageAlphaBlending
   is passed gdEffectOverlay and gdEffectMultiply */

BGD_DECLARE(void) gdImageSetPixel (gdImagePtr im, int x, int y, int color);
/* FreeType 2 text output with hook to extra flags */

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

BGD_DECLARE(void) gdImageAABlend (gdImagePtr im);

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

/* For backwards compatibility only. Use gdImageSetStyle()
   for much more flexible line drawing. */
BGD_DECLARE(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. */
BGD_DECLARE(void) gdImageRectangle (gdImagePtr im, int x1, int y1, int x2, int y2,
                                    int color);
/* Solid bar. Upper left corner first, lower right corner second. */
BGD_DECLARE(void) gdImageFilledRectangle (gdImagePtr im, int x1, int y1, int x2, int y2,
					  int color);
BGD_DECLARE(void) gdImageSetClip(gdImagePtr im, int x1, int y1, int x2, int y2);
BGD_DECLARE(void) gdImageGetClip(gdImagePtr im, int *x1P, int *y1P, int *x2P, int *y2P);
BGD_DECLARE(void) gdImageSetResolution(gdImagePtr im, const unsigned int res_x, const unsigned int res_y);
BGD_DECLARE(int) gdImageBoundsSafe (gdImagePtr im, int x, int y);
BGD_DECLARE(void) gdImageChar (gdImagePtr im, gdFontPtr f, int x, int y, int c,
                               int color);
BGD_DECLARE(void) gdImageCharUp (gdImagePtr im, gdFontPtr f, int x, int y, int c,
                                 int color);
BGD_DECLARE(void) gdImageString (gdImagePtr im, gdFontPtr f, int x, int y,
                                 unsigned char *s, int color);
BGD_DECLARE(void) gdImageStringUp (gdImagePtr im, gdFontPtr f, int x, int y,
                                   unsigned char *s, int color);
BGD_DECLARE(void) gdImageString16 (gdImagePtr im, gdFontPtr f, int x, int y,
                                   unsigned short *s, int color);
BGD_DECLARE(void) gdImageStringUp16 (gdImagePtr im, gdFontPtr f, int x, int y,
                                     unsigned short *s, int color);

/* 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. */
BGD_DECLARE(int) gdFontCacheSetup (void);

/* Optional: clean up after application is done using fonts in
   gdImageStringFT(). */
BGD_DECLARE(void) gdFontCacheShutdown (void);
/* 2.0.20: for backwards compatibility. A few applications did start calling
   this function when it first appeared although it was never documented.
   Simply invokes gdFontCacheShutdown. */
BGD_DECLARE(void) gdFreeFontCache (void);

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

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


/*
  Group: Types

  typedef: gdFTStringExtra

  typedef: gdFTStringExtraPtr

  A structure and associated pointer type used to pass additional
  parameters to the &lt;gdImageStringFTEx&gt; function. See
  &lt;gdImageStringFTEx&gt; for the structure definition.

  Thanks to Wez Furlong.
*/

/* 2.0.5: provides an extensible way to pass additional parameters.
   Thanks to Wez Furlong, sorry for the delay. */
typedef struct {
	int flags;		/* Logical OR of gdFTEX_ values */
	double linespacing;	/* fine tune line spacing for &#039;\n&#039; */
	int charmap;		/* TBB: 2.0.12: may be gdFTEX_Unicode,
				   gdFTEX_Shift_JIS, gdFTEX_Big5,
				   or gdFTEX_Adobe_Custom;
				   when not specified, maps are searched
				   for in the above order. */
	int hdpi;                /* if (flags &amp; gdFTEX_RESOLUTION) */
	int vdpi;		 /* if (flags &amp; gdFTEX_RESOLUTION) */
	char *xshow;             /* if (flags &amp; gdFTEX_XSHOW)
				    then, on return, xshow is a malloc&#039;ed
				    string containing xshow position data for
				    the last string.
				    
				    NB. The caller is responsible for gdFree&#039;ing
				    the xshow string.
				 */
	char *fontpath;	         /* if (flags &amp; gdFTEX_RETURNFONTPATHNAME)
				    then, on return, fontpath is a malloc&#039;ed
				    string containing the actual font file path name
				    used, which can be interesting when fontconfig
				    is in use.
				    
				    The caller is responsible for gdFree&#039;ing the
				    fontpath string.
				 */

}
gdFTStringExtra, *gdFTStringExtraPtr;

#define gdFTEX_LINESPACE 1
#define gdFTEX_CHARMAP 2
#define gdFTEX_RESOLUTION 4
#define gdFTEX_DISABLE_KERNING 8
#define gdFTEX_XSHOW 16
/* The default unless gdFTUseFontConfig(1); has been called:
   fontlist is a full or partial font file pathname or list thereof
   (i.e. just like before 2.0.29) */
#define gdFTEX_FONTPATHNAME 32
/* Necessary to use fontconfig patterns instead of font pathnames
   as the fontlist argument, unless gdFTUseFontConfig(1); has
   been called. New in 2.0.29 */
#define gdFTEX_FONTCONFIG 64
/* Sometimes interesting when fontconfig is used: the fontpath
   element of the structure above will contain a gdMalloc&#039;d string
   copy of the actual font file pathname used, if this flag is set
   when the call is made */
#define gdFTEX_RETURNFONTPATHNAME 128

/* If flag is nonzero, the fontlist parameter to gdImageStringFT
   and gdImageStringFTEx shall be assumed to be a fontconfig font pattern
   if fontconfig was compiled into gd. This function returns zero
   if fontconfig is not available, nonzero otherwise. */
BGD_DECLARE(int) gdFTUseFontConfig(int flag);

/* These are NOT flags; set one in &#039;charmap&#039; if you set the
   gdFTEX_CHARMAP bit in &#039;flags&#039;. */
#define gdFTEX_Unicode 0
#define gdFTEX_Shift_JIS 1
#define gdFTEX_Big5 2
#define gdFTEX_Adobe_Custom 3

BGD_DECLARE(char *) gdImageStringFTEx (gdImage * im, int *brect, int fg, char *fontlist,
                                       double ptsize, double angle, int x, int y,
                                       char *string, gdFTStringExtraPtr strex);


/*
  Group: Types

  typedef: gdPoint

  typedef: gdPointPtr

  Represents a point in the coordinate space of the image; used by
  &lt;gdImagePolygon&gt;, &lt;gdImageOpenPolygon&gt; and &lt;gdImageFilledPolygon&gt;
  for polygon drawing.

  &gt; typedef struct {
  &gt;     int x, y;
  &gt; } gdPoint, *gdPointPtr;

*/
typedef struct {
	int x, y;
}
gdPoint, *gdPointPtr;

/**
 * Typedef: gdRect
 *
 * A rectangle in the coordinate space of the image
 *
 * Members:
 *   x      - The x-coordinate of the upper left corner.
 *   y      - The y-coordinate of the upper left corner.
 *   width  - The width.
 *   height - The height.
 *
 * Typedef: gdRectPtr
 *
 * A pointer to a &lt;gdRect&gt;
 */
typedef struct {
	int x, y;
	int width, height;
}
gdRect, *gdRectPtr;


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

/* These functions still work with truecolor images,
   for which they never return error. */
BGD_DECLARE(int) gdImageColorAllocate (gdImagePtr im, int r, int g, int b);
/* gd 2.0: palette entries with non-opaque transparency are permitted. */
BGD_DECLARE(int) gdImageColorAllocateAlpha (gdImagePtr im, int r, int g, int b, int a);
/* Assumes opaque is the preferred alpha channel value */
BGD_DECLARE(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 */
BGD_DECLARE(int) gdImageColorClosestAlpha (gdImagePtr im, int r, int g, int b, int a);
/* An alternate method */
BGD_DECLARE(int) gdImageColorClosestHWB (gdImagePtr im, int r, int g, int b);
/* Returns exact, 100% opaque matches only */
BGD_DECLARE(int) gdImageColorExact (gdImagePtr im, int r, int g, int b);
/* Returns an exact match only, including alpha */
BGD_DECLARE(int) gdImageColorExactAlpha (gdImagePtr im, int r, int g, int b, int a);
/* Opaque only */
BGD_DECLARE(int) gdImageColorResolve (gdImagePtr im, int r, int g, int b);
/* Based on gdImageColorExactAlpha and gdImageColorClosestAlpha */
BGD_DECLARE(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) &lt;&lt; 16) + \
			      ((g) &lt;&lt; 8) +  \
			      (b))

/**
 * Group: Color Composition
 *
 * Macro: gdTrueColorAlpha
 *
 * Compose a truecolor value from its components
 *
 * Parameters:
 *   r - The red channel (0-255)
 *   g - The green channel (0-255)
 *   b - The blue channel (0-255)
 *   a - The alpha channel (0-127, where 127 is fully transparent, and 0 is
 *       completely opaque).
 *
 * See also:
 *   - &lt;gdTrueColorGetAlpha&gt;
 *   - &lt;gdTrueColorGetRed&gt;
 *   - &lt;gdTrueColorGetGreen&gt;
 *   - &lt;gdTrueColorGetBlue&gt;
 *   - &lt;gdImageColorExactAlpha&gt;
 */
#define gdTrueColorAlpha(r, g, b, a) (((a) &lt;&lt; 24) + \
				      ((r) &lt;&lt; 16) + \
				      ((g) &lt;&lt; 8) +  \
				      (b))

BGD_DECLARE(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 &quot;speckling.&quot; 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&#039;t use these 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.
   
   DIFFERENCES: gdImageCreatePaletteFromTrueColor creates and
   returns a new image. gdImageTrueColorToPalette modifies
   an existing image, and the truecolor pixels are discarded.
   
   gdImageTrueColorToPalette() returns TRUE on success, FALSE on failure.
*/

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

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

BGD_DECLARE(int) gdImagePaletteToTrueColor(gdImagePtr src);

/* 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 */

BGD_DECLARE(int) gdImageColorMatch(gdImagePtr im1, gdImagePtr im2);

/* Selects quantization method used for subsequent gdImageTrueColorToPalette calls.
   See gdPaletteQuantizationMethod enum (e.g. GD_QUANT_NEUQUANT, GD_QUANT_LIQ).
   Speed is from 1 (highest quality) to 10 (fastest).
   Speed 0 selects method-specific default (recommended).

   Returns FALSE if the given method is invalid or not available.
*/
BGD_DECLARE(int) gdImageTrueColorToPaletteSetMethod (gdImagePtr im, int method, int speed);

/*
  Chooses quality range that subsequent call to gdImageTrueColorToPalette will aim for.
  Min and max quality is in range 1-100 (1 = ugly, 100 = perfect). Max must be higher than min.
  If palette cannot represent image with at least min_quality, then image will remain true-color.
  If palette can represent image with quality better than max_quality, then lower number of colors will be used.
  This function has effect only when GD_QUANT_LIQ method has been selected and the source image is true-color.
*/
BGD_DECLARE(void) gdImageTrueColorToPaletteSetQuality (gdImagePtr im, int min_quality, int max_quality);

/* 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 */
BGD_DECLARE(void) gdImageColorTransparent (gdImagePtr im, int color);

BGD_DECLARE(void) gdImagePaletteCopy (gdImagePtr dst, gdImagePtr src);

typedef int (*gdCallbackImageColor)(gdImagePtr im, int src);

BGD_DECLARE(int) gdImageColorReplace(gdImagePtr im, int src, int dst);
BGD_DECLARE(int) gdImageColorReplaceThreshold(gdImagePtr im, int src, int dst, float threshold);
BGD_DECLARE(int) gdImageColorReplaceArray(gdImagePtr im, int len, int *src, int *dst);
BGD_DECLARE(int) gdImageColorReplaceCallback(gdImagePtr im, gdCallbackImageColor callback);

BGD_DECLARE(void) gdImageGif (gdImagePtr im, FILE * out);
BGD_DECLARE(void) gdImagePng (gdImagePtr im, FILE * out);
BGD_DECLARE(void) gdImagePngCtx (gdImagePtr im, gdIOCtx * out);
BGD_DECLARE(void) gdImageGifCtx (gdImagePtr im, gdIOCtx * out);
BGD_DECLARE(void) gdImageTiff(gdImagePtr im, FILE *outFile);
BGD_DECLARE(void *) gdImageTiffPtr(gdImagePtr im, int *size);
BGD_DECLARE(void) gdImageTiffCtx(gdImagePtr image, gdIOCtx *out);

BGD_DECLARE(void *) gdImageBmpPtr(gdImagePtr im, int *size, int compression);
BGD_DECLARE(void) gdImageBmp(gdImagePtr im, FILE *outFile, int compression);
BGD_DECLARE(void) gdImageBmpCtx(gdImagePtr im, gdIOCtxPtr out, int compression);

/* 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. */
BGD_DECLARE(void) gdImagePngEx (gdImagePtr im, FILE * out, int level);
BGD_DECLARE(void) gdImagePngCtxEx (gdImagePtr im, gdIOCtx * out, int level);

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

BGD_DECLARE(int) gdImageFile(gdImagePtr im, const char *filename);
BGD_DECLARE(int) gdSupportsFileType(const char *filename, int writing);


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

/* Best to free this memory with gdFree(), not free() */
BGD_DECLARE(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. */
BGD_DECLARE(void) gdImageJpeg (gdImagePtr im, FILE * out, int quality);
BGD_DECLARE(void) gdImageJpegCtx (gdImagePtr im, gdIOCtx * out, int quality);

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

BGD_DECLARE(void) gdImageWebpEx (gdImagePtr im, FILE * outFile, int quantization);
BGD_DECLARE(void) gdImageWebp (gdImagePtr im, FILE * outFile);
BGD_DECLARE(void *) gdImageWebpPtr (gdImagePtr im, int *size);
BGD_DECLARE(void *) gdImageWebpPtrEx (gdImagePtr im, int *size, int quantization);
BGD_DECLARE(void) gdImageWebpCtx (gdImagePtr im, gdIOCtx * outfile, int quantization);


/**
 * Group: GifAnim
 * 
 *   Legal values for Disposal. gdDisposalNone is always used by
 *   the built-in optimizer if previm is passed.
 *
 * Constants: gdImageGifAnim
 *
 *   gdDisposalUnknown              - Not recommended
 *   gdDisposalNone                 - Preserve previous frame
 *   gdDisposalRestoreBackground    - First allocated color of palette
 *   gdDisposalRestorePrevious      - Restore to before start of frame
 *
 * See also:
 *   - &lt;gdImageGifAnimAdd&gt;
 */
enum {
	gdDisposalUnknown,
	gdDisposalNone,
	gdDisposalRestoreBackground,
	gdDisposalRestorePrevious
};

BGD_DECLARE(void) gdImageGifAnimBegin(gdImagePtr im, FILE *outFile, int GlobalCM, int Loops);
BGD_DECLARE(void) gdImageGifAnimAdd(gdImagePtr im, FILE *outFile, int LocalCM, int LeftOfs, int TopOfs, int Delay, int Disposal, gdImagePtr previm);
BGD_DECLARE(void) gdImageGifAnimEnd(FILE *outFile);
BGD_DECLARE(void) gdImageGifAnimBeginCtx(gdImagePtr im, gdIOCtx *out, int GlobalCM, int Loops);
BGD_DECLARE(void) gdImageGifAnimAddCtx(gdImagePtr im, gdIOCtx *out, int LocalCM, int LeftOfs, int TopOfs, int Delay, int Disposal, gdImagePtr previm);
BGD_DECLARE(void) gdImageGifAnimEndCtx(gdIOCtx *out);
BGD_DECLARE(void *) gdImageGifAnimBeginPtr(gdImagePtr im, int *size, int GlobalCM, int Loops);
BGD_DECLARE(void *) gdImageGifAnimAddPtr(gdImagePtr im, int *size, int LocalCM, int LeftOfs, int TopOfs, int Delay, int Disposal, gdImagePtr previm);
BGD_DECLARE(void *) gdImageGifAnimEndPtr(int *size);


/*
  Group: Types

  typedef: gdSink

  typedef: gdSinkPtr

    *Note:* This interface is *obsolete* and kept only for
    *compatibility*.  Use &lt;gdIOCtx&gt; instead.

    Represents a &quot;sink&quot; (destination) to which a PNG can be
    written. Programmers who do not wish to write PNGs to a file can
    provide their own alternate output mechanism, using the
    &lt;gdImagePngToSink&gt; function. See the documentation of that
    function for an example of the proper use of this type.

    &gt; typedef struct {
    &gt;     int (*sink) (void *context, char *buffer, int len);
    &gt;     void *context;
    &gt; } gdSink, *gdSinkPtr;

    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;

BGD_DECLARE(void) gdImagePngToSink (gdImagePtr im, gdSinkPtr out);

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

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

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

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

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

/* 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
   &#039;pie slice&#039;. */
#define gdArc   0
#define gdPie   gdArc
#define gdChord 1
#define gdNoFill 2
#define gdEdged 4

BGD_DECLARE(void) gdImageFilledArc (gdImagePtr im, int cx, int cy, int w, int h, int s,
                                    int e, int color, int style);
BGD_DECLARE(void) gdImageArc (gdImagePtr im, int cx, int cy, int w, int h, int s, int e,
                              int color);
BGD_DECLARE(void) gdImageEllipse(gdImagePtr im, int cx, int cy, int w, int h, int color);
BGD_DECLARE(void) gdImageFilledEllipse (gdImagePtr im, int cx, int cy, int w, int h,
                                        int color);
BGD_DECLARE(void) gdImageFillToBorder (gdImagePtr im, int x, int y, int border,
                                       int color);
BGD_DECLARE(void) gdImageFill (gdImagePtr im, int x, int y, int color);
BGD_DECLARE(void) gdImageCopy (gdImagePtr dst, gdImagePtr src, int dstX, int dstY,
                               int srcX, int srcY, int w, int h);
BGD_DECLARE(void) gdImageCopyMerge (gdImagePtr dst, gdImagePtr src, int dstX, int dstY,
                                    int srcX, int srcY, int w, int h, int pct);
BGD_DECLARE(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. */
BGD_DECLARE(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. */
BGD_DECLARE(void) gdImageCopyResampled (gdImagePtr dst, gdImagePtr src, int dstX,
                                        int dstY, int srcX, int srcY, int dstW, int dstH,
                                        int srcW, int srcH);

/* gd 2.0.8: gdImageCopyRotated is added. Source
   is a rectangle, with its upper left corner at
   srcX and srcY. Destination is the *center* of
   the rotated copy. Angle is in degrees, same as
   gdImageArc. Floating point destination center
   coordinates allow accurate rotation of
   objects of odd-numbered width or height. */
BGD_DECLARE(void) gdImageCopyRotated (gdImagePtr dst,
                                      gdImagePtr src,
                                      double dstX, double dstY,
                                      int srcX, int srcY,
                                      int srcWidth, int srcHeight, int angle);

BGD_DECLARE(gdImagePtr) gdImageClone (gdImagePtr src);

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

BGD_DECLARE(gdImagePtr) gdImageNeuQuant(gdImagePtr im, const int max_color, int sample_factor);

enum gdPixelateMode {
	GD_PIXELATE_UPPERLEFT,
	GD_PIXELATE_AVERAGE
};

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

typedef struct {
	int sub;
	int plus;
	unsigned int num_colors;
	int *colors;
	unsigned int seed;
} gdScatter, *gdScatterPtr;

BGD_DECLARE(int) gdImageScatter(gdImagePtr im, int sub, int plus);
BGD_DECLARE(int) gdImageScatterColor(gdImagePtr im, int sub, int plus, int colors[], unsigned int num_colors);
BGD_DECLARE(int) gdImageScatterEx(gdImagePtr im, gdScatterPtr s);
BGD_DECLARE(int) gdImageSmooth(gdImagePtr im, float weight);
BGD_DECLARE(int) gdImageMeanRemoval(gdImagePtr im);
BGD_DECLARE(int) gdImageEmboss(gdImagePtr im);
BGD_DECLARE(int) gdImageGaussianBlur(gdImagePtr im);
BGD_DECLARE(int) gdImageEdgeDetectQuick(gdImagePtr src);
BGD_DECLARE(int) gdImageSelectiveBlur( gdImagePtr src);
BGD_DECLARE(int) gdImageConvolution(gdImagePtr src, float filter[3][3], float filter_div, float offset);
BGD_DECLARE(int) gdImageColor(gdImagePtr src, const int red, const int green, const int blue, const int alpha);
BGD_DECLARE(int) gdImageContrast(gdImagePtr src, double contrast);
BGD_DECLARE(int) gdImageBrightness(gdImagePtr src, int brightness);
BGD_DECLARE(int) gdImageGrayScale(gdImagePtr src);
BGD_DECLARE(int) gdImageNegate(gdImagePtr src);

BGD_DECLARE(gdImagePtr) gdImageCopyGaussianBlurred(gdImagePtr src, int radius,
                                                   double sigma);


/**
 * Group: Accessor Macros
 */

/**
 * Macro: gdImageTrueColor
 *
 * Whether an image is a truecolor image.
 *
 * Parameters:
 *   im - The image.
 *
 * Returns:
 *   Non-zero if the image is a truecolor image, zero for palette images.
 */
#define gdImageTrueColor(im) ((im)-&gt;trueColor)

/**
 * Macro: gdImageSX
 *
 * Gets the width (in pixels) of an image.
 * 
 * Parameters:
 *   im - The image.
 */
#define gdImageSX(im) ((im)-&gt;sx)

/**
 * Macro: gdImageSY
 *
 * Gets the height (in pixels) of an image.
 *
 * Parameters:
 *   im - The image.
 */
#define gdImageSY(im) ((im)-&gt;sy)

/**
 * Macro: gdImageColorsTotal
 *
 * Gets the number of colors in the palette.
 *
 * This macro is only valid for palette images.
 *
 * Parameters:
 *   im - The image
 */
#define gdImageColorsTotal(im) ((im)-&gt;colorsTotal)

/**
 * Macro: gdImageRed
 *
 * Gets the red component value of a given color.
 *
 * Parameters:
 *   im - The image.
 *   c  - The color.
 */
#define gdImageRed(im, c) ((im)-&gt;trueColor ? gdTrueColorGetRed(c) : \
			   (im)-&gt;red[(c)])

/**
 * Macro: gdImageGreen
 *
 * Gets the green component value of a given color.
 *
 * Parameters:
 *   im - The image.
 *   c  - The color.
 */
#define gdImageGreen(im, c) ((im)-&gt;trueColor ? gdTrueColorGetGreen(c) : \
			     (im)-&gt;green[(c)])

/**
 * Macro: gdImageBlue
 *
 * Gets the blue component value of a given color.
 *
 * Parameters:
 *   im - The image.
 *   c  - The color.
 */
#define gdImageBlue(im, c) ((im)-&gt;trueColor ? gdTrueColorGetBlue(c) : \
			    (im)-&gt;blue[(c)])

/**
 * Macro: gdImageAlpha
 *
 * Gets the alpha component value of a given color.
 *
 * Parameters:
 *   im - The image.
 *   c  - The color.
 */
#define gdImageAlpha(im, c) ((im)-&gt;trueColor ? gdTrueColorGetAlpha(c) : \
			     (im)-&gt;alpha[(c)])

/**
 * Macro: gdImageGetTransparent
 *
 * Gets the transparent color of the image.
 *
 * Parameters:
 *   im - The image.
 *
 * See also:
 *   - &lt;gdImageColorTransparent&gt;
 */
#define gdImageGetTransparent(im) ((im)-&gt;transparent)

/**
 * Macro: gdImageGetInterlaced
 *
 * Whether an image is interlaced.
 *
 * Parameters:
 *   im - The image.
 *
 * Returns:
 *   Non-zero for interlaced images, zero otherwise.
 *
 * See also:
 *   - &lt;gdImageInterlace&gt;
 */
#define gdImageGetInterlaced(im) ((im)-&gt;interlace)

/**
 * Macro: gdImagePalettePixel
 *
 * Gets the color of a pixel.
 *
 * Calling this macro is only valid for palette images.
 * No bounds checking is done for the coordinates.
 *
 * Parameters:
 *   im - The image.
 *   x  - The x-coordinate.
 *   y  - The y-coordinate.
 *
 * See also:
 *   - &lt;gdImageTrueColorPixel&gt;
 *   - &lt;gdImageGetPixel&gt;
 */
#define gdImagePalettePixel(im, x, y) (im)-&gt;pixels[(y)][(x)]

/**
 * Macro: gdImageTrueColorPixel
 *
 * Gets the color of a pixel.
 *
 * Calling this macro is only valid for truecolor images.
 * No bounds checking is done for the coordinates.
 *
 * Parameters:
 *   im - The image.
 *   x  - The x-coordinate.
 *   y  - The y-coordinate.
 *
 * See also:
 *   - &lt;gdImagePalettePixel&gt;
 *   - &lt;gdImageGetTrueColorPixel&gt;
 */
#define gdImageTrueColorPixel(im, x, y) (im)-&gt;tpixels[(y)][(x)]

/**
 * Macro: gdImageResolutionX
 *
 * Gets the horizontal resolution in DPI.
 *
 * Parameters:
 *   im - The image.
 *
 * See also:
 *   - &lt;gdImageResolutionY&gt;
 *   - &lt;gdImageSetResolution&gt;
 */
#define gdImageResolutionX(im) (im)-&gt;res_x

/**
 * Macro: gdImageResolutionY
 *
 * Gets the vertical resolution in DPI.
 *
 * Parameters:
 *   im - The image.
 *
 * See also:
 *   - &lt;gdImageResolutionX&gt;
 *   - &lt;gdImageSetResolution&gt;
 */
#define gdImageResolutionY(im) (im)-&gt;res_y

/* I/O Support routines. */

BGD_DECLARE(gdIOCtx *) gdNewFileCtx (FILE *);
/* If data is null, size is ignored and an initial data buffer is
   allocated automatically. NOTE: this function assumes gd has the right
   to free or reallocate &quot;data&quot; at will! Also note that gd will free
   &quot;data&quot; when the IO context is freed. If data is not null, it must point
   to memory allocated with gdMalloc, or by a call to gdImage[something]Ptr.
   If not, see gdNewDynamicCtxEx for an alternative. */
BGD_DECLARE(gdIOCtx *) gdNewDynamicCtx (int size, void *data);
/* 2.0.21: if freeFlag is nonzero, gd will free and/or reallocate &quot;data&quot; as
   needed as described above. If freeFlag is zero, gd will never free
   or reallocate &quot;data&quot;, which means that the context should only be used
   for *reading* an image from a memory buffer, or writing an image to a
   memory buffer which is already large enough. If the memory buffer is
   not large enough and an image write is attempted, the write operation
   will fail. Those wishing to write an image to a buffer in memory have
   a much simpler alternative in the gdImage[something]Ptr functions. */
BGD_DECLARE(gdIOCtx *) gdNewDynamicCtxEx (int size, void *data, int freeFlag);
BGD_DECLARE(gdIOCtx *) gdNewSSCtx (gdSourcePtr in, gdSinkPtr out);
BGD_DECLARE(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                  &quot;gd2&quot;

#define GD2_FMT_RAW             1
#define GD2_FMT_COMPRESSED      2

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

BGD_DECLARE(void) gdImageFlipHorizontal(gdImagePtr im);
BGD_DECLARE(void) gdImageFlipVertical(gdImagePtr im);
BGD_DECLARE(void) gdImageFlipBoth(gdImagePtr im);

#define GD_FLIP_HORINZONTAL 1
#define GD_FLIP_VERTICAL 2
#define GD_FLIP_BOTH 3

/**
 * Group: Crop
 *
 * Constants: gdCropMode
 *  GD_CROP_DEFAULT - Default crop mode (4 corners or background)
 *  GD_CROP_TRANSPARENT - Crop using the transparent color
 *  GD_CROP_BLACK - Crop black borders
 *  GD_CROP_WHITE - Crop white borders
 *  GD_CROP_SIDES - Crop using colors of the 4 corners
 *
 * See also:
 *   - &lt;gdImageCropAuto&gt;
 **/
enum gdCropMode {
	GD_CROP_DEFAULT = 0,
	GD_CROP_TRANSPARENT,
	GD_CROP_BLACK,
	GD_CROP_WHITE,
	GD_CROP_SIDES,
	GD_CROP_THRESHOLD
};

BGD_DECLARE(gdImagePtr) gdImageCrop(gdImagePtr src, const gdRect *crop);
BGD_DECLARE(gdImagePtr) gdImageCropAuto(gdImagePtr im, const unsigned int mode);
BGD_DECLARE(gdImagePtr) gdImageCropThreshold(gdImagePtr im, const unsigned int color, const float threshold);

BGD_DECLARE(int) gdImageSetInterpolationMethod(gdImagePtr im, gdInterpolationMethod id);
BGD_DECLARE(gdInterpolationMethod) gdImageGetInterpolationMethod(gdImagePtr im);

BGD_DECLARE(gdImagePtr) gdImageScale(const gdImagePtr src, const unsigned int new_width, const unsigned int new_height);

BGD_DECLARE(gdImagePtr) gdImageRotateInterpolated(const gdImagePtr src, const float angle, int bgcolor);

typedef enum {
	GD_AFFINE_TRANSLATE = 0,
	GD_AFFINE_SCALE,
	GD_AFFINE_ROTATE,
	GD_AFFINE_SHEAR_HORIZONTAL,
	GD_AFFINE_SHEAR_VERTICAL
} gdAffineStandardMatrix;

BGD_DECLARE(int) gdAffineApplyToPointF (gdPointFPtr dst, const gdPointFPtr src, const double affine[6]);
BGD_DECLARE(int) gdAffineInvert (double dst[6], const double src[6]);
BGD_DECLARE(int) gdAffineFlip (double dst_affine[6], const double src_affine[6], const int flip_h, const int flip_v);
BGD_DECLARE(int) gdAffineConcat (double dst[6], const double m1[6], const double m2[6]);

BGD_DECLARE(int) gdAffineIdentity (double dst[6]);
BGD_DECLARE(int) gdAffineScale (double dst[6], const double scale_x, const double scale_y);
BGD_DECLARE(int) gdAffineRotate (double dst[6], const double angle);
BGD_DECLARE(int) gdAffineShearHorizontal (double dst[6], const double angle);
BGD_DECLARE(int) gdAffineShearVertical(double dst[6], const double angle);
BGD_DECLARE(int) gdAffineTranslate (double dst[6], const double offset_x, const double offset_y);
BGD_DECLARE(double) gdAffineExpansion (const double src[6]);
BGD_DECLARE(int) gdAffineRectilinear (const double src[6]);
BGD_DECLARE(int) gdAffineEqual (const double matrix1[6], const double matrix2[6]);
BGD_DECLARE(int) gdTransformAffineGetImage(gdImagePtr *dst, const gdImagePtr src, gdRectPtr src_area, const double affine[6]);
BGD_DECLARE(int) gdTransformAffineCopy(gdImagePtr dst, int dst_x, int dst_y, const gdImagePtr src, gdRectPtr src_region, const double affine[6]);
/*
gdTransformAffineCopy(gdImagePtr dst, int x0, int y0, int x1, int y1,
		      const gdImagePtr src, int src_width, int src_height,
		      const double affine[6]);
*/
BGD_DECLARE(int) gdTransformAffineBoundingBox(gdRectPtr src, const double affine[6], gdRectPtr bbox);

/**
 * Group: Image Comparison
 *
 * Constants:
 *   GD_CMP_IMAGE       - Actual image IS different
 *   GD_CMP_NUM_COLORS  - Number of colors in pallette differ
 *   GD_CMP_COLOR       - Image colors differ
 *   GD_CMP_SIZE_X      - Image width differs
 *   GD_CMP_SIZE_Y      - Image heights differ
 *   GD_CMP_TRANSPARENT - Transparent color differs
 *   GD_CMP_BACKGROUND  - Background color differs
 *   GD_CMP_INTERLACE   - Interlaced setting differs
 *   GD_CMP_TRUECOLOR   - Truecolor vs palette differs
 *
 * See also:
 *   - &lt;gdImageCompare&gt;
 */
#define GD_CMP_IMAGE		1
#define GD_CMP_NUM_COLORS	2
#define GD_CMP_COLOR		4
#define GD_CMP_SIZE_X		8
#define GD_CMP_SIZE_Y		16
#define GD_CMP_TRANSPARENT	32
#define GD_CMP_BACKGROUND	64
#define GD_CMP_INTERLACE	128
#define GD_CMP_TRUECOLOR	256

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


/* Version information functions */
BGD_DECLARE(int) gdMajorVersion(void);
BGD_DECLARE(int) gdMinorVersion(void);
BGD_DECLARE(int) gdReleaseVersion(void);
BGD_DECLARE(const char *) gdExtraVersion(void);
BGD_DECLARE(const char *) gdVersionString(void);


#ifdef __cplusplus
}
#endif

/* newfangled special effects */
#include &quot;gdfx.h&quot;

#endif				/* GD_H */

#ifdef __cplusplus
}
#endif
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