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[server,shadow] detect changes no alpha

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add shadow_capture_compare_with_format no alpha comparison option. If
not both, source and destination have alpha, just ignore it.
This commit is contained in:
akallabeth 2024-03-05 09:00:00 +01:00 committed by akallabeth
parent dc4bd6609b
commit e4a0746cdc
1 changed files with 44 additions and 1 deletions
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45
server/shadow/shadow_capture.c
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@ -211,13 +211,56 @@ static BOOL pixel_equal(const BYTE* a, UINT32 formatA, const BYTE* b, UINT32 for
return TRUE;
}
static BOOL color_equal_no_alpha(UINT32 colorA, UINT32 formatA, UINT32 colorB, UINT32 formatB)
{
BYTE ar = 0;
BYTE ag = 0;
BYTE ab = 0;
BYTE br = 0;
BYTE bg = 0;
BYTE bb = 0;
FreeRDPSplitColor(colorA, formatA, &ar, &ag, &ab, NULL, NULL);
FreeRDPSplitColor(colorB, formatB, &br, &bg, &bb, NULL, NULL);
if (ar != br)
return FALSE;
if (ag != bg)
return FALSE;
if (ab != bb)
return FALSE;
return TRUE;
}
static BOOL pixel_equal_no_alpha(const BYTE* a, UINT32 formatA, const BYTE* b, UINT32 formatB,
size_t count)
{
const size_t bppA = FreeRDPGetBytesPerPixel(formatA);
const size_t bppB = FreeRDPGetBytesPerPixel(formatB);
for (size_t x = 0; x < count; x++)
{
const UINT32 colorA = FreeRDPReadColor(&a[bppA * x], formatA);
const UINT32 colorB = FreeRDPReadColor(&b[bppB * x], formatB);
if (!color_equal_no_alpha(colorA, formatA, colorB, formatB))
return FALSE;
}
return TRUE;
}
int shadow_capture_compare_with_format(const BYTE* pData1, UINT32 format1, UINT32 nStep1,
UINT32 nWidth, UINT32 nHeight, const BYTE* pData2,
UINT32 format2, UINT32 nStep2, RECTANGLE_16* rect)
{
BOOL(*pixel_equal_fn)
(const BYTE* a, UINT32 formatA, const BYTE* b, UINT32 formatB, size_t count) = pixel_equal;
if (format1 == format2)
return shadow_capture_compare(pData1, nStep1, nWidth, nHeight, pData2, nStep2, rect);
if (!FreeRDPColorHasAlpha(format1) || !FreeRDPColorHasAlpha(format2))
pixel_equal_fn = pixel_equal_no_alpha;
BOOL allEqual = TRUE;
UINT32 tw = 0;
const UINT32 nrow = (nHeight + 15) / 16;
@ -254,7 +297,7 @@ int shadow_capture_compare_with_format(const BYTE* pData1, UINT32 format1, UINT3
for (size_t k = 0; k < th; k++)
{
if (!pixel_equal(p1, format1, p2, format2, tw))
if (!pixel_equal_fn(p1, format1, p2, format2, tw))
{
equal = FALSE;
break;