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(svn r13640) -Codechange: make colours behind not fully solid objects less darker for BM_TRANSPARENT (for 32bpp blitters)

This commit is contained in:
smatz 2008-06-26 16:47:29 +00:00
parent 114c820c56
commit 1834a2f670
3 changed files with 34 additions and 17 deletions
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25
src/blitter/32bpp_anim.cpp
View File

@ -136,15 +136,24 @@ inline void Blitter_32bppAnim::Draw(const Blitter::BlitterParams *bp, ZoomLevel
* we produce a result the newgrf maker didn't expect ;) */
/* Make the current color a bit more black, so it looks like this image is transparent */
src_px += n;
src_n += n;
do {
*dst = MakeTransparent(*dst, 192);
*anim = remap[*anim];
anim++;
dst++;
} while (--n != 0);
if (src_px->a == 255) {
src_px += n;
do {
*dst = MakeTransparent(*dst, 3, 4);
*anim = remap[*anim];
anim++;
dst++;
} while (--n != 0);
} else {
do {
*dst = MakeTransparent(*dst, (256 * 4 - src_px->a), 256 * 4);
*anim = remap[*anim];
anim++;
dst++;
src_px++;
} while (--n != 0);
}
break;
default:

7
src/blitter/32bpp_base.hpp
View File

@ -105,16 +105,17 @@ public:
/**
* Make a pixel looks like it is transparent.
* @param colour the colour already on the screen.
* @param amount the amount of transparency, times 256.
* @param nom the amount of transparency, nominator, makes colour lighter.
* @param denom denominator, makes colour darker.
* @return the new colour for the screen.
*/
static inline uint32 MakeTransparent(uint32 colour, uint amount)
static inline uint32 MakeTransparent(uint32 colour, uint nom, uint denom = 256)
{
uint r = GB(colour, 16, 8);
uint g = GB(colour, 8, 8);
uint b = GB(colour, 0, 8);
return ComposeColour(0xFF, r * amount / 256, g * amount / 256, b * amount / 256);
return ComposeColour(0xFF, r * nom / denom, g * nom / denom, b * nom / denom);
}
/**

19
src/blitter/32bpp_optimized.cpp
View File

@ -142,13 +142,20 @@ inline void Blitter_32bppOptimized::Draw(const Blitter::BlitterParams *bp, ZoomL
* we produce a result the newgrf maker didn't expect ;) */
/* Make the current color a bit more black, so it looks like this image is transparent */
src_px += n;
src_n += n;
do {
*dst = MakeTransparent(*dst, 192);
dst++;
} while (--n != 0);
if (src_px->a == 255) {
src_px += n;
do {
*dst = MakeTransparent(*dst, 3, 4);
dst++;
} while (--n != 0);
} else {
do {
*dst = MakeTransparent(*dst, (256 * 4 - src_px->a), 256 * 4);
dst++;
src_px++;
} while (--n != 0);
}
break;
default: