set_color_conversion man page on DragonFly

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set_color_conversion(3)		Allegro manual	       set_color_conversion(3)

       set_color_conversion - Tells Allegro how to convert images during load‐
       ing time.

       #include <allegro.h>

       void set_color_conversion(int mode);

       Specifies how to convert images between the various color  depths  when
       reading graphics from external bitmap files or datafiles. The mode is a
       bitmask specifying which types of conversion are allowed. If the appro‐
       priate bit is set, data will be converted into the current pixel format
       (selected by calling the set_color_depth() function), otherwise it will
       be  left in the same format as the disk file, leaving you to convert it
       manually before the graphic can be displayed. The default mode is total
       conversion, so that all images will be loaded in the appropriate format
       for the current video mode. Valid bit flags are:

	  COLORCONV_NONE		// disable all format
					// conversions
	  COLORCONV_8_TO_15		// expand 8-bit to 15-bit
	  COLORCONV_8_TO_16		// expand 8-bit to 16-bit
	  COLORCONV_8_TO_24		// expand 8-bit to 24-bit
	  COLORCONV_8_TO_32		// expand 8-bit to 32-bit
	  COLORCONV_15_TO_8		// reduce 15-bit to 8-bit
	  COLORCONV_15_TO_16		// expand 15-bit to 16-bit
	  COLORCONV_15_TO_24		// expand 15-bit to 24-bit
	  COLORCONV_15_TO_32		// expand 15-bit to 32-bit
	  COLORCONV_16_TO_8		// reduce 16-bit to 8-bit
	  COLORCONV_16_TO_15		// reduce 16-bit to 15-bit
	  COLORCONV_16_TO_24		// expand 16-bit to 24-bit
	  COLORCONV_16_TO_32		// expand 16-bit to 32-bit
	  COLORCONV_24_TO_8		// reduce 24-bit to 8-bit
	  COLORCONV_24_TO_15		// reduce 24-bit to 15-bit
	  COLORCONV_24_TO_16		// reduce 24-bit to 16-bit
	  COLORCONV_24_TO_32		// expand 24-bit to 32-bit
	  COLORCONV_32_TO_8		// reduce 32-bit RGB to 8-bit
	  COLORCONV_32_TO_15		// reduce 32-bit RGB to 15-bit
	  COLORCONV_32_TO_16		// reduce 32-bit RGB to 16-bit
	  COLORCONV_32_TO_24		// reduce 32-bit RGB to 24-bit
	  COLORCONV_32A_TO_8		// reduce 32-bit RGBA to 8-bit
	  COLORCONV_32A_TO_15		// reduce 32-bit RGBA to 15-bit
	  COLORCONV_32A_TO_16		// reduce 32-bit RGBA to 16-bit
	  COLORCONV_32A_TO_24		// reduce 32-bit RGBA to 24-bit
	  COLORCONV_DITHER_PAL		// dither when reducing to 8-bit
	  COLORCONV_DITHER_HI		// dither when reducing to
					// hicolor
	  COLORCONV_KEEP_TRANS		// keep original transparency

       For convenience, the following macros can be used to select common com‐
       binations of these flags:

	  COLORCONV_EXPAND_256		// expand 256-color to hi/truecolor
	  COLORCONV_REDUCE_TO_256	// reduce hi/truecolor to 256-color
	  COLORCONV_EXPAND_15_TO_16	// expand 15-bit hicolor to 16-bit
	  COLORCONV_REDUCE_16_TO_15	// reduce 16-bit hicolor to 15-bit
	  COLORCONV_EXPAND_HI_TO_TRUE	// expand 15/16-bit to 24/32-bit
	  COLORCONV_REDUCE_TRUE_TO_HI	// reduce 24/32-bit to 15/16-bit
	  COLORCONV_24_EQUALS_32	// convert between 24- and 32-bit
	  COLORCONV_TOTAL		// everything to current format
	  COLORCONV_PARTIAL		// convert 15 <-> 16-bit and
					// 24 <-> 32-bit
	  COLORCONV_MOST		// all but hi/truecolor <-> 256
	  COLORCONV_DITHER		// dither during all color reductions
	  COLORCONV_KEEP_ALPHA		// convert everything to current format
					// unless it would lose alpha information

       If  you	enable	the COLORCONV_DITHER flag, dithering will be performed
       whenever truecolor graphics are converted into a	 hicolor  or  paletted
       format, including by the blit() function, and any automatic conversions
       that take place while reading graphics from disk. This can produce much
       better  looking	results, but is obviously slower than a direct conver‐

       If you intend using converted bitmaps with functions like masked_blit()
       or  draw_sprite(), you should specify the COLORCONV_KEEP_TRANS flag. It
       will ensure that the masked areas in the bitmap before  and  after  the
       conversion stay exactly the same, by mapping transparent colors to each
       other and adjusting colors which would be converted to the  transparent
       color  otherwise.  It  affects  every blit() operation between distinct
       pixel formats and every automatic conversion.

       set_color_depth(3),	    load_bitmap(3),	     load_datafile(3),
       fixup_datafile(3),  makecol15_dither(3), get_color_conversion(3), exal‐
       pha(3), exblend(3), exdata(3), exexedat(3),  exlights(3),  exrotscl(3),

Allegro				 version 4.4.2	       set_color_conversion(3)

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