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Fix: Correctly set alpha of output in AlphaBlendTwoPixels

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Match alpha behaviour of ComposeColourRGBA
This commit is contained in:
Jonathan G Rennison
2022-09-29 00:46:31 +01:00
committed by Loïc Guilloux
parent da1a0d042e
commit f9cdb5b610
3 changed files with 24 additions and 14 deletions
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9
src/blitter/32bpp_anim_sse4.cpp
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@@ -53,6 +53,7 @@ inline void Blitter_32bppSSE4_Anim::Draw(const Blitter::BlitterParams *bp, ZoomL
const __m128i a_cm = ALPHA_CONTROL_MASK;
const __m128i pack_low_cm = PACK_LOW_CONTROL_MASK;
const __m128i tr_nom_base = TRANSPARENT_NOM_BASE;
const __m128i a_am = ALPHA_AND_MASK;
for (int y = bp->height; y != 0; y--) {
Colour *dst = dst_line;
@@ -144,7 +145,7 @@ inline void Blitter_32bppSSE4_Anim::Draw(const Blitter::BlitterParams *bp, ZoomL
/* Blend colours. */
bmno_alpha_blend:
srcABCD = AlphaBlendTwoPixels(srcABCD, dstABCD, a_cm, pack_low_cm);
srcABCD = AlphaBlendTwoPixels(srcABCD, dstABCD, a_cm, pack_low_cm, a_am);
bmno_full_opacity:
_mm_storel_epi64((__m128i *) dst, srcABCD);
bmno_full_transparency:
@@ -171,7 +172,7 @@ bmno_full_transparency:
} else {
srcABCD = _mm_cvtsi32_si128(src->data);
}
dst->data = _mm_cvtsi128_si32(AlphaBlendTwoPixels(srcABCD, dstABCD, a_cm, pack_low_cm));
dst->data = _mm_cvtsi128_si32(AlphaBlendTwoPixels(srcABCD, dstABCD, a_cm, pack_low_cm, a_am));
}
}
break;
@@ -255,7 +256,7 @@ bmno_full_transparency:
/* Blend colours. */
bmcr_alpha_blend:
srcABCD = AlphaBlendTwoPixels(srcABCD, dstABCD, a_cm, pack_low_cm);
srcABCD = AlphaBlendTwoPixels(srcABCD, dstABCD, a_cm, pack_low_cm, a_am);
bmcr_full_opacity:
_mm_storel_epi64((__m128i *) dst, srcABCD);
bmcr_full_transparency:
@@ -288,7 +289,7 @@ bmcr_full_transparency:
if (src->a < 255) {
bmcr_alpha_blend_single:
__m128i dstABCD = _mm_cvtsi32_si128(dst->data);
srcABCD = AlphaBlendTwoPixels(srcABCD, dstABCD, a_cm, pack_low_cm);
srcABCD = AlphaBlendTwoPixels(srcABCD, dstABCD, a_cm, pack_low_cm, a_am);
}
dst->data = _mm_cvtsi128_si32(srcABCD);
}