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(svn r10142) -Fix r10132: do something useful with the alpha channel instead of ignoring it

This commit is contained in:
truelight 2007-06-13 16:04:35 +00:00
parent 5f1791bfb1
commit 4185c4afcd
2 changed files with 38 additions and 4 deletions
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40
src/blitter/32bpp_simple.cpp
View File

@ -16,6 +16,39 @@ static inline uint ComposeColor(uint r, uint g, uint b)
return (r & 0xFF) << 16 | (g & 0xFF) << 8 | (b & 0xFF) << 0;
}
/**
* Compose a color based on RGBA values and the current pixel value.
*/
static inline uint ComposeColorRGBA(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 ComposeColor((r * a + cr * (255 - a)) / 255,
(g * a + cg * (255 - a)) / 255,
(b * a + cb * (255 - a)) / 255);
}
/**
* Compose a color based on Pixel value, alpha value, and the current pixel value.
*/
static inline uint ComposeColorPA(uint color, uint a, uint current)
{
uint r, g, b, cr, cg, cb;
r = GB(color, 16, 8);
g = GB(color, 8, 8);
b = GB(color, 0, 8);
cr = GB(current, 16, 8);
cg = GB(current, 8, 8);
cb = GB(current, 0, 8);
return ComposeColor((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 color the color already on the screen.
@ -69,14 +102,13 @@ void Blitter_32bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, Zoo
src_line += bp->sprite_width * ScaleByZoom(1, zoom);
for (int x = 0; x < bp->width; x++) {
switch (mode) {
case BM_COLOUR_REMAP:
/* In case the m-channel is zero, do not remap this pixel in any way */
if (src->m == 0) {
if (src->a != 0) *dst = ComposeColor(src->r, src->g, src->b);
if (src->a != 0) *dst = ComposeColorRGBA(src->r, src->g, src->b, src->a, *dst);
} else {
if (bp->remap[src->m] != 0) *dst = Renderer_32bpp::LookupColourInPalette(bp->remap[src->m]);
if (bp->remap[src->m] != 0) *dst = ComposeColorPA(Renderer_32bpp::LookupColourInPalette(bp->remap[src->m]), src->a, *dst);
}
break;
@ -90,7 +122,7 @@ void Blitter_32bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, Zoo
break;
default:
if (src->a != 0) *dst = ComposeColor(src->r, src->g, src->b);
if (src->a != 0) *dst = ComposeColorRGBA(src->r, src->g, src->b, src->a, *dst);
break;
}
dst++;

2
src/fontcache.cpp
View File

@ -419,6 +419,7 @@ const Sprite *GetGlyph(FontSize size, WChar key)
for (x = 0; x < slot->bitmap.width; x++) {
if (HASBIT(slot->bitmap.buffer[(x / 8) + y * slot->bitmap.pitch], 7 - (x % 8))) {
sprite.data[1 + x + (1 + y) * sprite.width].m = SHADOW_COLOUR;
sprite.data[1 + x + (1 + y) * sprite.width].a = 0xFF;
}
}
}
@ -428,6 +429,7 @@ const Sprite *GetGlyph(FontSize size, WChar key)
for (x = 0; x < slot->bitmap.width; x++) {
if (HASBIT(slot->bitmap.buffer[(x / 8) + y * slot->bitmap.pitch], 7 - (x % 8))) {
sprite.data[x + y * sprite.width].m = FACE_COLOUR;
sprite.data[x + y * sprite.width].a = 0xFF;
}
}
}