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sw_engine raster: fixing rasterization of an image with InvMask

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In case of the image rasterization with an inverse mask the opacity
was omitted and the alpha value instead of the inverse alpha value was used.
This commit is contained in:
Mira Grudzinska 2021-02-05 01:45:26 +01:00 • committed by Hermet Park
parent 028e1fa251
commit 5e1d3772ca
1 changed files with 3 additions and 2 deletions
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5
src/lib/sw_engine/tvgSwRaster.cpp
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@ -454,7 +454,8 @@ static bool _translucentImageInvAlphaMask(SwSurface* surface, const uint32_t *im
auto rX = static_cast<uint32_t>(roundf(x * invTransform->e11 + ey1));
auto rY = static_cast<uint32_t>(roundf(x * invTransform->e21 + ey2));
if (rX >= w || rY >= h) continue;
auto tmp = ALPHA_BLEND(img[rX + (rY * w)], ALPHA_MULTIPLY(opacity, surface->blender.alpha(*cmp))); //TODO: need to use image's stride
auto ialpha = 255 - surface->blender.alpha(*cmp);
auto tmp = ALPHA_BLEND(img[rX + (rY * w)], ALPHA_MULTIPLY(opacity, ialpha)); //TODO: need to use image's stride
*dst = tmp + ALPHA_BLEND(*dst, 255 - surface->blender.alpha(tmp));
}
}
@ -534,7 +535,7 @@ static bool _translucentImageInvAlphaMask(SwSurface* surface, uint32_t *img, uin
auto src = &sbuffer[y * w]; //TODO: need to use image's stride
for (uint32_t x = 0; x < w2; ++x, ++dst, ++src, ++cmp) {
auto ialpha = 255 - surface->blender.alpha(*cmp);
auto tmp = ALPHA_BLEND(*src, ialpha);
auto tmp = ALPHA_BLEND(*src, ALPHA_MULTIPLY(opacity, ialpha));
*dst = tmp + ALPHA_BLEND(*dst, 255 - surface->blender.alpha(tmp));
}
}