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create_trans_table(3)		Allegro	manual		 create_trans_table(3)

       create_trans_table  -  Fills a color mapping table for translucency ef-
       fects. Allegro game programming library.

       #include	<allegro.h>

       void create_trans_table(COLOR_MAP *table, const PALETTE pal, int	r,  g,
       b, void (*callback)(int pos));

       Fills  the  specified  color  mapping  table with lookup	data for doing
       translucency effects with the specified	palette.  When	combining  the
       colors  c1 and c2 with this table, the result will be a color somewhere
       between the two.	The r, g, and b	parameters  specify  the  solidity  of
       each  color component, ranging from 0 (totally transparent) to 255 (to-
       tally solid). For 50% solidity, pass 128.

       This function treats source color #0 as a  special  case,  leaving  the
       destination  unchanged  whenever	a zero source pixel is encountered, so
       that masked sprites will	draw correctly.	This function will take	advan-
       tage  of	 the global rgb_map variable to	speed up color conversions. If
       the callback function is	not NULL, it will be called 256	 times	during
       the calculation,	allowing you to	display	a progress indicator. Example:

	  COLOR_MAP trans_table;
	  /* Build a color lookup table	for translucent	drawing. */
	  create_trans_table(&trans_table, pal,	128, 128, 128, NULL);

       color_map(3),	create_light_table(3),	 create_color_table(3),	  cre-
       ate_blender_table(3),	 draw_trans_sprite(3),	   draw_lit_sprite(3),
       draw_gouraud_sprite(3), rgb_map(3), ex3d(3), extrans(3)

Allegro				 version 4.4.3		 create_trans_table(3)


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