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Fixed warning C4310: cast truncates constant value

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This commit is contained in:
Sam Lantinga
2024-08-29 19:31:23 -07:00
parent 5518aca054
commit efc98062af
1 changed files with 4 additions and 4 deletions
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8
src/video/SDL_blit_A.c
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@@ -1045,8 +1045,8 @@ static void SDL_TARGETING("sse4.1") Blit8888to8888PixelAlphaSwizzleSSE41(SDL_Bli
srca_hi = _mm_xor_si128(srca_hi, _mm_set1_epi16(0xff00));
// maddubs expects second argument to be signed, so subtract 128
src128 = _mm_sub_epi8(src128, _mm_set1_epi8((char)128));
dst128 = _mm_sub_epi8(dst128, _mm_set1_epi8((char)128));
src128 = _mm_sub_epi8(src128, _mm_set1_epi8((Uint8)128));
dst128 = _mm_sub_epi8(dst128, _mm_set1_epi8((Uint8)128));
// dst = srcA*(src-128) + (255-srcA)*(dst-128) = srcA*src + (255-srcA)*dst - 128*255
__m128i dst_lo = _mm_maddubs_epi16(srca_lo, _mm_unpacklo_epi8(src128, dst128));
@@ -1138,8 +1138,8 @@ static void SDL_TARGETING("avx2") Blit8888to8888PixelAlphaSwizzleAVX2(SDL_BlitIn
alpha_hi = _mm256_xor_si256(alpha_hi, _mm256_set1_epi16(0xff00));
// maddubs expects second argument to be signed, so subtract 128
src256 = _mm256_sub_epi8(src256, _mm256_set1_epi8((char)128));
dst256 = _mm256_sub_epi8(dst256, _mm256_set1_epi8((char)128));
src256 = _mm256_sub_epi8(src256, _mm256_set1_epi8((Uint8)128));
dst256 = _mm256_sub_epi8(dst256, _mm256_set1_epi8((Uint8)128));
// dst = srcA*(src-128) + (255-srcA)*(dst-128) = srcA*src + (255-srcA)*dst - 128*255
__m256i dst_lo = _mm256_maddubs_epi16(alpha_lo, _mm256_unpacklo_epi8(src256, dst256));