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Change: Support custom transparency remaps with 32bpp blitters.

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This closes a 15 year old TODO...
This commit is contained in:
Peter Nelson
2023-12-22 16:01:33 +00:00
committed by Peter Nelson
parent 0bc22dd310
commit 9ce1626bb4
10 changed files with 114 additions and 24 deletions
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16
src/blitter/32bpp_simple.cpp
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@@ -9,6 +9,7 @@
#include "../stdafx.h"
#include "../zoom_func.h"
#include "../palette_func.h"
#include "32bpp_simple.hpp"
#include "../table/sprites.h"
@@ -63,12 +64,17 @@ void Blitter_32bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, Zoo
break;
case BM_TRANSPARENT:
/* TODO -- We make an assumption here that the remap in fact is transparency, not some colour.
* This is never a problem with the code we produce, but newgrfs can make it fail... or at least:
* we produce a result the newgrf maker didn't expect ;) */
/* Make the current colour a bit more black, so it looks like this image is transparent */
if (src->a != 0) *dst = MakeTransparent(*dst, 192);
if (src->a != 0) {
*dst = MakeTransparent(*dst, 192);
}
break;
case BM_TRANSPARENT_REMAP:
/* Apply custom transparency remap. */
if (src->a != 0) {
*dst = this->LookupColourInPalette(bp->remap[GetNearestColourIndex(*dst)]);
}
break;
default: