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comctl32: Pre-multiply static control bitmap image by alpha for GdiAlphaBlend.
Signed-off-by: Jinoh Kang <jinoh.kang.kr@gmail.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>
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parent
c4773e1823
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@ -203,6 +203,17 @@ static HBITMAP create_alpha_bitmap( HBITMAP hbitmap )
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DeleteObject( alpha );
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alpha = 0;
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}
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else
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{
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/* pre-multiply by alpha */
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for (i = 0, ptr = bits; i < bm.bmWidth * bm.bmHeight; i++, ptr += 4)
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{
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unsigned int alpha = ptr[3];
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ptr[0] = (ptr[0] * alpha + 127) / 255;
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ptr[1] = (ptr[1] * alpha + 127) / 255;
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ptr[2] = (ptr[2] * alpha + 127) / 255;
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}
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}
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}
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DeleteDC( hdc );
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@ -165,7 +165,6 @@ static void test_image(HBITMAP image, BOOL is_dib, BOOL is_premult, BOOL is_alph
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ok(bm.bmBits != NULL, "bmBits is NULL\n");
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memcpy(bits, bm.bmBits, 4);
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if (is_premult)
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todo_wine
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ok(bits[0] == 0x05 && bits[1] == 0x09 && bits[2] == 0x0e && bits[3] == 0x44,
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"bits: %02x %02x %02x %02x\n", bits[0], bits[1], bits[2], bits[3]);
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else if (is_alpha)
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@ -195,7 +194,6 @@ static void test_image(HBITMAP image, BOOL is_dib, BOOL is_premult, BOOL is_alph
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DeleteDC(hdc);
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if (is_premult)
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todo_wine
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ok(bits[0] == 0x05 && bits[1] == 0x09 && bits[2] == 0x0e && bits[3] == 0x44,
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"bits: %02x %02x %02x %02x\n", bits[0], bits[1], bits[2], bits[3]);
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else if (is_alpha)
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