gd.c

void gdSetErrorMethod( gdErrorMethod  error_method )

void gdClearErrorMethod( void )

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

gdImagePtr gdImageCreate ( int  sx, int  sy )

gdImageCreate is called to create palette-based images, with no more than 256 colors.  The image must eventually be destroyed using gdImageDestroy().

Parameters

Returns

A pointer to the new image or NULL if an error occurred.

Example

gdImagePtr im;
im = gdImageCreate(64, 64);
// ... Use the image ...
gdImageDestroy(im);

See Also

gdImageCreateTrueColor

gdImagePtr gdImageCreateTrueColor ( int  sx, int  sy )

gdImageCreateTrueColor is called to create truecolor images, with an essentially unlimited number of colors.  Invoke gdImageCreateTrueColor with the x and y dimensions of the desired image.  gdImageCreateTrueColor returns a gdImagePtr to the new image, or NULL if unable to allocate the image.  The image must eventually be destroyed using <gdImageDestroy>().

Truecolor images are always filled with black at creation time.  There is no concept of a “background” color index.

Parameters

Returns

A pointer to the new image or NULL if an error occurred.

Example

gdImagePtr im;
im = gdImageCreateTrueColor(64, 64);
// ... Use the image ...
gdImageDestroy(im);

See Also

gdImageCreateTrueColor

void gdImageDestroy ( gdImagePtr  im )

gdImageDestroy is used to free the memory associated with an image.  It is important to invoke gdImageDestroy before exiting your program or assigning a new image to a gdImagePtr variable.

Parameters

Returns

Nothing.

Example

gdImagePtr im;
im = gdImageCreate(10, 10);
// ... Use the image ...
// Now destroy it
gdImageDestroy(im);

int gdImageColorClosest ( gdImagePtr  im, int  r, int  g, int  b )

int gdImageColorClosestAlpha ( gdImagePtr  im, int  r, int  g, int  b, int  a )

int gdImageColorClosestHWB ( gdImagePtr  im, int  r, int  g, int  b )

int gdImageColorExact ( gdImagePtr  im, int  r, int  g, int  b )

int gdImageColorExactAlpha ( gdImagePtr  im, int  r, int  g, int  b, int  a )

int gdImageColorAllocate ( gdImagePtr  im, int  r, int  g, int  b )

int gdImageColorAllocateAlpha ( gdImagePtr  im, int  r, int  g, int  b, int  a )

int gdImageColorResolve ( gdImagePtr  im, int  r, int  g, int  b )

gdImageColorResolve is an alternative for the code fragment

if ((color=gdImageColorExact(im,R,G,B)) < 0)
  if ((color=gdImageColorAllocate(im,R,G,B)) < 0)
    color=gdImageColorClosest(im,R,G,B);

in a single function.  Its advantage is that it is guaranteed to return a color index in one search over the color table.

int gdImageColorResolveAlpha ( gdImagePtr  im, int  r, int  g, int  b, int  a )

void gdImageColorDeallocate ( gdImagePtr  im, int  color )

void gdImageColorTransparent ( gdImagePtr  im, int  color )

void gdImagePaletteCopy ( gdImagePtr  to, gdImagePtr  from )

int gdImageColorReplace ( gdImagePtr  im, int  src, int  dst )

int gdImageColorReplaceThreshold ( gdImagePtr  im, int  src, int  dst, float  threshold )

int gdImageColorReplaceArray ( gdImagePtr  im, int  len, int  * src, int  * dst )

int gdImageColorReplaceCallback ( gdImagePtr  im, gdCallbackImageColor  callback )

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

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

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

void gdImageAABlend ( gdImagePtr  im )

NO-OP, kept for library compatibility.

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

Bresenham as presented in Foley & Van Dam.

void gdImageDashedLine ( gdImagePtr  im, int  x1, int  y1, int  x2, int  y2, int  color )

int gdImageBoundsSafe ( gdImagePtr  im, int  x, int  y )

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 )

void gdImageArc ( gdImagePtr  im, int  cx, int  cy, int  w, int  h, int  s, int  e, int  color )

void gdImageFilledArc ( gdImagePtr  im, int  cx, int  cy, int  w, int  h, int  s, int  e, int  color, int  style )

void gdImageEllipse( gdImagePtr  im, int  mx, int  my, int  w, int  h, int  c )

void gdImageFilledEllipse ( gdImagePtr  im, int  mx, int  my, int  w, int  h, int  c )

void gdImageFillToBorder ( gdImagePtr  im, int  x, int  y, int  border, int  color )

void gdImageFill( gdImagePtr  im, int  x, int  y, int  nc )

void gdImageRectangle ( gdImagePtr  im, int  x1, int  y1, int  x2, int  y2, int  color )

void gdImageFilledRectangle ( gdImagePtr  im, int  x1, int  y1, int  x2, int  y2, int  color )

gdImagePtr gdImageClone ( gdImagePtr  src )

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 )

This function is a substitute for real alpha channel operations, so it doesn’t pay attention to the alpha channel.

void gdImageCopyMergeGray ( gdImagePtr  dst, gdImagePtr  src, int  dstX, int  dstY, int  srcX, int  srcY, int  w, int  h, int  pct )

This function is a substitute for real alpha channel operations, so it doesn’t pay attention to the alpha channel.

void gdImageCopyResized ( gdImagePtr  dst, gdImagePtr  src, int  dstX, int  dstY, int  srcX, int  srcY, int  dstW, int  dstH, int  srcW, int  srcH )

void gdImageCopyRotated ( gdImagePtr  dst, gdImagePtr  src, double  dstX, double  dstY, int  srcX, int  srcY, int  srcWidth, int  srcHeight, int  angle )

void gdImageCopyResampled ( gdImagePtr  dst, gdImagePtr  src, int  dstX, int  dstY, int  srcX, int  srcY, int  dstW, int  dstH, int  srcW, int  srcH )

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

void gdImageOpenPolygon ( gdImagePtr  im, gdPointPtr  p, int  n, int  c )

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

void gdImageSetStyle ( gdImagePtr  im, int  * style, int  noOfPixels )

void gdImageSetThickness ( gdImagePtr  im, int  thickness )

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 gdImageInterlace ( gdImagePtr  im, int  interlaceArg )

int gdImageCompare ( gdImagePtr  im1, gdImagePtr  im2 )

int gdAlphaBlend ( int  dst, int  src )

int gdLayerOverlay ( int  dst, int  src )

int gdLayerMultiply ( int  dst, int  src )

Apply ‘multiply’ effect.

void gdImageAlphaBlending ( gdImagePtr  im, int  alphaBlendingArg )

void gdImageSaveAlpha ( gdImagePtr  im, int  saveAlphaArg )

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 gdImageSetResolution( gdImagePtr  im, const unsigned  int  res_x, const unsigned  int  res_y )

int gdImagePaletteToTrueColor( gdImagePtr  src )

Convert a palette image to true color.