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(svn r10225) -Codechange: move common Colour routines for 32bpp to the base class (and nick it colour, not color)

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truelight
2007-06-19 17:32:01 +00:00
parent bf0be8f0bc
commit bd215277b5
2 changed files with 89 additions and 84 deletions
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90
src/blitter/32bpp_base.hpp
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@@ -26,10 +26,92 @@ public:
/* virtual */ void PaletteAnimate(uint start, uint count);
/* virtual */ Blitter::PaletteAnimation UsePaletteAnimation();
static inline uint32 LookupColourInPalette(uint8 index) {
#define ARGB(a, r, g, b) ((((a) << 24) & 0xFF000000) | (((r) << 16) & 0x00FF0000) | (((g) << 8) & 0x0000FF00) | ((b) & 0x000000FF))
if (index == 0) return 0x00000000;
return ARGB(0xFF, _cur_palette[index].r, _cur_palette[index].g, _cur_palette[index].b);
/**
* Compose a colour based on RGB values.
*/
static inline uint ComposeColour(uint a, uint r, uint g, uint b)
{
return (((a) << 24) & 0xFF000000) | (((r) << 16) & 0x00FF0000) | (((g) << 8) & 0x0000FF00) | ((b) & 0x000000FF);
}
/**
* Look up the colour in the current palette.
**/
static inline uint32 LookupColourInPalette(uint8 index)
{
if (index == 0) return 0x00000000; // Full transparent pixel */
return ComposeColour(0xFF, _cur_palette[index].r, _cur_palette[index].g, _cur_palette[index].b);
}
/**
* Compose a colour based on RGBA values and the current pixel value.
*/
static inline uint ComposeColourRGBA(uint r, uint g, uint b, uint a, uint current)
{
uint cr, cg, cb;
cr = GB(current, 16, 8);
cg = GB(current, 8, 8);
cb = GB(current, 0, 8);
return ComposeColour(0xFF,
(r * a + cr * (255 - a)) / 255,
(g * a + cg * (255 - a)) / 255,
(b * a + cb * (255 - a)) / 255);
}
/**
* Compose a colour based on Pixel value, alpha value, and the current pixel value.
*/
static inline uint ComposeColourPA(uint colour, uint a, uint current)
{
uint r, g, b, cr, cg, cb;
r = GB(colour, 16, 8);
g = GB(colour, 8, 8);
b = GB(colour, 0, 8);
cr = GB(current, 16, 8);
cg = GB(current, 8, 8);
cb = GB(current, 0, 8);
return ComposeColour(0xFF,
(r * a + cr * (255 - a)) / 255,
(g * a + cg * (255 - a)) / 255,
(b * a + cb * (255 - a)) / 255);
}
/**
* Make a pixel looks like it is transparent.
* @param colour the colour already on the screen.
* @param amount the amount of transparency, times 100.
* @return the new colour for the screen.
*/
static inline uint MakeTransparent(uint colour, uint amount)
{
uint r, g, b;
r = GB(colour, 16, 8);
g = GB(colour, 8, 8);
b = GB(colour, 0, 8);
return ComposeColour(0xFF, r * amount / 100, g * amount / 100, b * amount / 100);
}
/**
* Make a colour grey-based.
* @param colour the colour to make grey.
* @return the new colour, now grey.
*/
static inline uint MakeGrey(uint colour)
{
uint r, g, b;
r = GB(colour, 16, 8);
g = GB(colour, 8, 8);
b = GB(colour, 0, 8);
/* To avoid doubles and stuff, multiple it with a total of 65536 (16bits), then
* divide by it to normalize the value to a byte again. See heightmap.cpp for
* information about the formula. */
colour = ((r * 19595) + (g * 38470) + (b * 7471)) / 65536;
return ComposeColour(0xFF, colour, colour, colour);
}
};