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Use alpha in image viewer (checkered background)

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mid 2025-10-05 23:29:40 +03:00
parent c7468d0944
commit aff60df9da
1 changed files with 13 additions and 2 deletions
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15
ui/frame.cpp
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@ -915,8 +915,19 @@ __attribute__((optimize("O3"))) static uint8_t *bgra64torgb24(uint8_t *orig, siz
__m128i z[8] = {};
for(int zi = 0; zi < 8; zi++) {
z[zi] = _mm_loadu_si128((__m128i*) temp + zi);
z[zi] = apply_gamma_epi16(z[zi], _mm_set_ps(1, 1 / 2.2f, 1 / 2.2f, 1 / 2.2f));
// Alpha-blend with checkered background.
__m128i bottom = (((x + zi) / 4 ^ y / 4) & 1)
? _mm_set_epi16(0xFFFF, 0x8000, 0x8000, 0x8000, 0xFFFF, 0x8000, 0x8000, 0x8000)
: _mm_set_epi16(0xFFFF, 0x4000, 0x4000, 0x4000, 0xFFFF, 0x4000, 0x4000, 0x4000);
__m128i top = _mm_loadu_si128((__m128i*) temp + zi);
__m128i alpha = _mm_shuffle_epi8(top, _mm_set_epi8(15, 14, 15, 14, 15, 14, 15, 14, 7, 6, 7, 6, 7, 6, 7, 6));
__m128i invAlpha = _mm_sub_epi16(_mm_set1_epi16(0xFFFF), alpha);
__m128i result = _mm_add_epi16(_mm_mulhi_epu16(top, alpha), _mm_mulhi_epu16(bottom, invAlpha));
z[zi] = apply_gamma_epi16(result, _mm_set_ps(1, 1 / 2.2f, 1 / 2.2f, 1 / 2.2f));
}
__m128i a = _mm_shuffle_epi8(z[0], _mm_set_epi8(-128, -128, -128, -128, -128, -128, -128, -128, -128, -128, 9, 11, 13, 1, 3, 5));