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Fix viewport map scrolling box blend on emscripten

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Jonathan G Rennison
2022-05-19 00:09:14 +01:00
parent b92ae644c4
commit a9caeaa7f1
1 changed files with 4 additions and 0 deletions
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4
src/viewport.cpp
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@@ -3127,6 +3127,10 @@ uint32 ViewportMapGetColour(const Viewport * const vp, int x, int y, const uint
/* Taken from http://stereopsis.com/doubleblend.html, PixelBlend() is faster than ComposeColourRGBANoCheck() */ /* Taken from http://stereopsis.com/doubleblend.html, PixelBlend() is faster than ComposeColourRGBANoCheck() */
static inline void PixelBlend(uint32 * const d, const uint32 s) static inline void PixelBlend(uint32 * const d, const uint32 s)
{ {
#if defined(__EMSCRIPTEN__)
*d = Blitter_32bppBase::ComposeColourRGBANoCheck(s & 0xFF, (s >> 8) & 0xFF, (s >> 16) & 0xFF, (s >> 24) & 0xFF, Colour(*d)).data;
return;
#endif
const uint32 a = (s >> 24) + 1; const uint32 a = (s >> 24) + 1;
const uint32 dstrb = *d & 0xFF00FF; const uint32 dstrb = *d & 0xFF00FF;
const uint32 dstg = *d & 0xFF00; const uint32 dstg = *d & 0xFF00;