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windowscodecs: Fix rounding in premultiplied alpha conversion.

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Signed-off-by: Jinoh Kang <jinoh.kang.kr@gmail.com>
Signed-off-by: Esme Povirk <esme@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Jinoh Kang 2022-03-14 21:30:47 +09:00 committed by Alexandre Julliard
parent 3c0e25eb1a
commit e0d820a4cd
2 changed files with 37 additions and 13 deletions
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12
dlls/windowscodecs/converter.c
View file

@ -984,9 +984,9 @@ static HRESULT copypixels_to_32bppPBGRA(struct FormatConverter *This, const WICR
BYTE alpha = pbBuffer[cbStride*y+4*x+3];
if (alpha != 255)
{
pbBuffer[cbStride*y+4*x] = pbBuffer[cbStride*y+4*x] * alpha / 255;
pbBuffer[cbStride*y+4*x+1] = pbBuffer[cbStride*y+4*x+1] * alpha / 255;
pbBuffer[cbStride*y+4*x+2] = pbBuffer[cbStride*y+4*x+2] * alpha / 255;
pbBuffer[cbStride*y+4*x] = (pbBuffer[cbStride*y+4*x] * alpha + 127) / 255;
pbBuffer[cbStride*y+4*x+1] = (pbBuffer[cbStride*y+4*x+1] * alpha + 127) / 255;
pbBuffer[cbStride*y+4*x+2] = (pbBuffer[cbStride*y+4*x+2] * alpha + 127) / 255;
}
}
}
@ -1017,9 +1017,9 @@ static HRESULT copypixels_to_32bppPRGBA(struct FormatConverter *This, const WICR
BYTE alpha = pbBuffer[cbStride*y+4*x+3];
if (alpha != 255)
{
pbBuffer[cbStride*y+4*x] = pbBuffer[cbStride*y+4*x] * alpha / 255;
pbBuffer[cbStride*y+4*x+1] = pbBuffer[cbStride*y+4*x+1] * alpha / 255;
pbBuffer[cbStride*y+4*x+2] = pbBuffer[cbStride*y+4*x+2] * alpha / 255;
pbBuffer[cbStride*y+4*x] = (pbBuffer[cbStride*y+4*x] * alpha + 127) / 255;
pbBuffer[cbStride*y+4*x+1] = (pbBuffer[cbStride*y+4*x+1] * alpha + 127) / 255;
pbBuffer[cbStride*y+4*x+2] = (pbBuffer[cbStride*y+4*x+2] * alpha + 127) / 255;
}
}
}

38
dlls/windowscodecs/tests/converter.c
View file

@ -453,13 +453,21 @@ static const BYTE bits_32bppBGR[] = {
0,255,255,80, 255,0,255,80, 255,255,0,80, 255,255,255,80, 0,255,255,80, 255,0,255,80, 255,255,0,80, 255,255,255,80,
0,255,255,80, 255,0,255,80, 255,255,0,80, 255,255,255,80, 0,255,255,80, 255,0,255,80, 255,255,0,80, 255,255,255,80,
0,255,255,80, 255,0,255,80, 255,255,0,80, 255,255,255,80, 0,255,255,80, 255,0,255,80, 255,255,0,80, 255,255,255,80,
0,255,255,80, 255,0,255,80, 255,255,0,80, 255,255,255,80, 0,255,255,80, 255,0,255,80, 255,255,0,80, 255,255,255,80};
0,255,255,80, 255,0,255,80, 255,255,0,80, 255,255,255,80, 0,255,255,80, 255,0,255,80, 255,255,0,80, 255,255,255,80,
3,3,3,80, 6,6,6,80, 12,12,12,80, 15,15,15,80, 19,19,19,80, 22,22,22,80, 28,28,28,80, 31,31,31,80,
35,35,35,80, 38,38,38,80, 41,41,41,80, 47,47,47,80, 47,47,47,80, 54,54,54,80, 57,57,57,80, 63,63,63,80,
66,66,66,80, 70,70,70,80, 73,73,73,80, 79,79,79,80, 82,82,82,80, 86,86,86,80, 89,89,89,80, 95,95,95,80,
98,98,98,80, 98,98,98,80, 105,105,105,80, 108,108,108,80, 114,114,114,80, 117,117,117,80, 121,121,121,80, 124,124,124,80,
130,130,130,80, 133,133,133,80, 137,137,137,80, 140,140,140,80, 146,146,146,80, 149,149,149,80, 156,156,156,80, 156,156,156,80,
159,159,159,80, 165,165,165,80, 168,168,168,80, 172,172,172,80, 175,175,175,80, 181,181,181,80, 184,184,184,80, 188,188,188,80,
191,191,191,80, 197,197,197,80, 200,200,200,80, 207,207,207,80, 207,207,207,80, 213,213,213,80, 216,216,216,80, 219,219,219,80,
223,223,223,80, 226,226,226,80, 232,232,232,80, 235,235,235,80, 239,239,239,80, 242,242,242,80, 248,248,248,80, 251,251,251,80};
static const struct bitmap_data testdata_32bppBGR = {
&GUID_WICPixelFormat32bppBGR, 32, bits_32bppBGR, 32, 2, 96.0, 96.0};
static const struct bitmap_data testdata_32bppBGRA80 = {
&GUID_WICPixelFormat32bppBGRA, 32, bits_32bppBGR, 32, 2, 96.0, 96.0};
&GUID_WICPixelFormat32bppBGRA, 32, bits_32bppBGR, 32, 4, 96.0, 96.0};
static const struct bitmap_data testdata_32bppRGBA80 = {
&GUID_WICPixelFormat32bppRGBA, 32, bits_32bppBGR, 32, 2, 96.0, 96.0};
&GUID_WICPixelFormat32bppRGBA, 32, bits_32bppBGR, 32, 4, 96.0, 96.0};
static const BYTE bits_32bppBGRA[] = {
255,0,0,255, 0,255,0,255, 0,0,255,255, 0,0,0,255, 255,0,0,255, 0,255,0,255, 0,0,255,255, 0,0,0,255,
@ -469,7 +477,15 @@ static const BYTE bits_32bppBGRA[] = {
0,255,255,255, 255,0,255,255, 255,255,0,255, 255,255,255,255, 0,255,255,255, 255,0,255,255, 255,255,0,255, 255,255,255,255,
0,255,255,255, 255,0,255,255, 255,255,0,255, 255,255,255,255, 0,255,255,255, 255,0,255,255, 255,255,0,255, 255,255,255,255,
0,255,255,255, 255,0,255,255, 255,255,0,255, 255,255,255,255, 0,255,255,255, 255,0,255,255, 255,255,0,255, 255,255,255,255,
0,255,255,255, 255,0,255,255, 255,255,0,255, 255,255,255,255, 0,255,255,255, 255,0,255,255, 255,255,0,255, 255,255,255,255};
0,255,255,255, 255,0,255,255, 255,255,0,255, 255,255,255,255, 0,255,255,255, 255,0,255,255, 255,255,0,255, 255,255,255,255,
3,3,3,255, 6,6,6,255, 12,12,12,255, 15,15,15,255, 19,19,19,255, 22,22,22,255, 28,28,28,255, 31,31,31,80,
35,35,35,255, 38,38,38,255, 41,41,41,255, 47,47,47,255, 47,47,47,255, 54,54,54,255, 57,57,57,255, 63,63,63,80,
66,66,66,255, 70,70,70,255, 73,73,73,255, 79,79,79,255, 82,82,82,255, 86,86,86,255, 89,89,89,255, 95,95,95,80,
98,98,98,255, 98,98,98,255, 105,105,105,255, 108,108,108,255, 114,114,114,255, 117,117,117,255, 121,121,121,255, 124,124,124,80,
130,130,130,255, 133,133,133,255, 137,137,137,255, 140,140,140,255, 146,146,146,255, 149,149,149,255, 156,156,156,255, 156,156,156,80,
159,159,159,255, 165,165,165,255, 168,168,168,255, 172,172,172,255, 175,175,175,255, 181,181,181,255, 184,184,184,255, 188,188,188,80,
191,191,191,255, 197,197,197,255, 200,200,200,255, 207,207,207,255, 207,207,207,255, 213,213,213,255, 216,216,216,255, 219,219,219,80,
223,223,223,255, 226,226,226,255, 232,232,232,255, 235,235,235,255, 239,239,239,255, 242,242,242,255, 248,248,248,255, 251,251,251,80};
static const BYTE bits_32bppRGBA[] = {
0,0,255,255, 0,255,0,255, 255,0,0,255, 0,0,0,255, 0,0,255,255, 0,255,0,255, 255,0,0,255, 0,0,0,255,
0,0,255,255, 0,255,0,255, 255,0,0,255, 0,0,0,255, 0,0,255,255, 0,255,0,255, 255,0,0,255, 0,0,0,255,
@ -495,11 +511,19 @@ static const BYTE bits_32bppPBGRA[] = {
0,80,80,80, 80,0,80,80, 80,80,0,80, 80,80,80,80, 0,80,80,80, 80,0,80,80, 80,80,0,80, 80,80,80,80,
0,80,80,80, 80,0,80,80, 80,80,0,80, 80,80,80,80, 0,80,80,80, 80,0,80,80, 80,80,0,80, 80,80,80,80,
0,80,80,80, 80,0,80,80, 80,80,0,80, 80,80,80,80, 0,80,80,80, 80,0,80,80, 80,80,0,80, 80,80,80,80,
0,80,80,80, 80,0,80,80, 80,80,0,80, 80,80,80,80, 0,80,80,80, 80,0,80,80, 80,80,0,80, 80,80,80,80};
0,80,80,80, 80,0,80,80, 80,80,0,80, 80,80,80,80, 0,80,80,80, 80,0,80,80, 80,80,0,80, 80,80,80,80,
1,1,1,80, 2,2,2,80, 4,4,4,80, 5,5,5,80, 6,6,6,80, 7,7,7,80, 9,9,9,80, 10,10,10,80,
11,11,11,80, 12,12,12,80, 13,13,13,80, 15,15,15,80, 15,15,15,80, 17,17,17,80, 18,18,18,80, 20,20,20,80,
21,21,21,80, 22,22,22,80, 23,23,23,80, 25,25,25,80, 26,26,26,80, 27,27,27,80, 28,28,28,80, 30,30,30,80,
31,31,31,80, 31,31,31,80, 33,33,33,80, 34,34,34,80, 36,36,36,80, 37,37,37,80, 38,38,38,80, 39,39,39,80,
41,41,41,80, 42,42,42,80, 43,43,43,80, 44,44,44,80, 46,46,46,80, 47,47,47,80, 49,49,49,80, 49,49,49,80,
50,50,50,80, 52,52,52,80, 53,53,53,80, 54,54,54,80, 55,55,55,80, 57,57,57,80, 58,58,58,80, 59,59,59,80,
60,60,60,80, 62,62,62,80, 63,63,63,80, 65,65,65,80, 65,65,65,80, 67,67,67,80, 68,68,68,80, 69,69,69,80,
70,70,70,80, 71,71,71,80, 73,73,73,80, 74,74,74,80, 75,75,75,80, 76,76,76,80, 78,78,78,80, 79,79,79,80};
static const struct bitmap_data testdata_32bppPBGRA = {
&GUID_WICPixelFormat32bppPBGRA, 32, bits_32bppPBGRA, 32, 2, 96.0, 96.0};
&GUID_WICPixelFormat32bppPBGRA, 32, bits_32bppPBGRA, 32, 4, 96.0, 96.0};
static const struct bitmap_data testdata_32bppPRGBA = {
&GUID_WICPixelFormat32bppPRGBA, 32, bits_32bppPBGRA, 32, 2, 96.0, 96.0};
&GUID_WICPixelFormat32bppPRGBA, 32, bits_32bppPBGRA, 32, 4, 96.0, 96.0};
static const BYTE bits_64bppRGBA[] = {
128,0,128,0,128,255,128,255, 128,0,128,255,128,0,128,255, 128,255,128,0,128,0,128,255, 128,0,128,0,128,0,128,255, 128,0,128,0,128,255,128,255, 128,0,128,255,128,0,128,255, 128,255,128,0,128,0,128,255, 128,0,128,0,128,0,128,255,