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sw_engine fill: correct the range of opacity,

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also some minor code refactors.
This commit is contained in:
Hermet Park 2021-07-06 10:43:36 +09:00
parent 7a8d7ceac6
commit 925b9c8ba9
1 changed files with 4 additions and 5 deletions
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9
src/lib/sw_engine/tvgSwFill.cpp
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@ -77,12 +77,11 @@ static bool _updateColorTable(SwFill* fill, const Fill* fdata, const SwSurface*
while (pos < next->offset && i < GRADIENT_STOP_SIZE) {
auto t = (pos - curr->offset) * delta;
auto dist = static_cast<int32_t>(256 * t);
auto dist2 = 256 - dist;
auto dist = static_cast<int32_t>(255 * t);
auto dist2 = 255 - dist;
auto color = COLOR_INTERPOLATE(rgba, dist2, rgba2, dist);
uint8_t a = color >> 24;
fill->ctable[i] = ALPHA_BLEND(color | 0xff000000, a);
fill->ctable[i] = ALPHA_BLEND((color | 0xff000000), (color >> 24));
++i;
pos += inc;
@ -90,7 +89,7 @@ static bool _updateColorTable(SwFill* fill, const Fill* fdata, const SwSurface*
rgba = rgba2;
a = a2;
}
rgba = ALPHA_BLEND(rgba | 0xff000000, a);
rgba = ALPHA_BLEND((rgba | 0xff000000), a);
for (; i < GRADIENT_STOP_SIZE; ++i)
fill->ctable[i] = rgba;