gflChangeColorDepth

The gflChangeColorDepth function changes the picture type.

GFL_ERROR gflChangeColorDepth(
  GFL_BITMAP * src,  

  GFL_BITMAP ** dst,  

  GFL_MODE mode,  

  GFL_MODE_PARAMS params
);

Parameters

src

Pointer to a GFL_BITMAP structure.

dst

Address of a pointer to a GFL_BITMAP structure.
NULL if on the same instance.

mode

GFL_MODE_TO_BINARY	Binary (8 bits)
GFL_MODE_TO_4GREY	4 Greyscale (8 bits)
GFL_MODE_TO_8GREY	8 Greyscale (8 bits)
GFL_MODE_TO_16GREY	16 Greyscale (8 bits)
GFL_MODE_TO_32GREY	32 Greyscale (8 bits)
GFL_MODE_TO_64GREY	64 Greyscale (8 bits)
GFL_MODE_TO_128GREY	128 Greyscale (8 bits)
GFL_MODE_TO_216GREY	216 Greyscale (8 bits)
GFL_MODE_TO_256GREY	256 Greyscale (8 bits)
GFL_MODE_TO_8COLORS	8 Colors (8 bits)
GFL_MODE_TO_16COLORS	16 Colors (8 bits)
GFL_MODE_TO_32COLORS	32 Colors (8 bits)
GFL_MODE_TO_64COLORS	64 Colors (8 bits)
GFL_MODE_TO_128GREY	128 Colors (8 bits)
GFL_MODE_TO_216COLORS	216 Colors (8 bits)
GFL_MODE_TO_256COLORS	256 Colors (8 bits)
GFL_MODE_TO_RGB	Red-Green-Blue (24 bits)
GFL_MODE_TO_RGBA	Red-Green-Blue-Alpha (32 bits)
GFL_MODE_TO_BGR	Blue-Green-Red (24 bits)
GFL_MODE_TO_ABGR	Alpha-Blue-Green-Red (32 bits)
GFL_MODE_TO_BGRA	Blue-Green-Red-Alpha (32 bits)

params

Indicates a dither to be used for colors, greyscale & binary.

GFL_MODE_NO_DITHER	No dithering
GFL_MODE_ADAPTIVE	Adaptive without dithering
GFL_MODE_PATTERN_DITHER	Pattern dithering
GFL_MODE_HALTONE45_DITHER	HalfTone 45 dithering
GFL_MODE_HALTONE90_DITHER	HalfTone 90 dithering
GFL_MODE_FLOYD_STEINBERG	Floyd-Steinberg dithering

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.

See also

gflGetColorAt, gflGetNumberOfColorsUsed