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Code Issues Projects Releases Activity

Workaround for corrupted background on toolbar icons

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narzoul 2016-02-27 19:26:50 +01:00
parent 1ab496cbf5
commit 2f85be8952
1 changed files with 35 additions and 0 deletions
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35
DDrawCompat/CompatGdi.cpp
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@ -1,3 +1,4 @@
#include "CompatDirectDrawPalette.h"
#include "CompatDirectDrawSurface.h"
#include "CompatGdi.h"
#include "CompatGdiCaret.h"
@ -107,6 +108,39 @@ namespace
return true;
}
/*
Workaround for correctly drawing icons with a transparent background using BitBlt and a monochrome
bitmap mask. Normally black (index 0) and white (index 255) are selected as foreground and background
colors on the target DC so that a BitBlt with the SRCAND ROP would preserve the background pixels and
set the foreground pixels to 0. (Logical AND with 0xFF preserves all bits.)
But if the physical palette contains another, earlier white entry, SRCAND will be performed with the
wrong index (less than 0xFF), erasing some of the bits from all background pixels.
This workaround replaces all unwanted white entries with a similar color.
*/
void replaceDuplicateWhitePaletteEntries(const PALETTEENTRY (&entries)[256])
{
PALETTEENTRY newEntries[256] = {};
memcpy(newEntries, entries, sizeof(entries));
bool isReplacementDone = false;
for (int i = 0; i < 255; ++i)
{
if (0xFF == entries[i].peRed && 0xFF == entries[i].peGreen && 0xFF == entries[i].peBlue)
{
newEntries[i].peRed = 0xFE;
newEntries[i].peGreen = 0xFE;
newEntries[i].peBlue = 0xFE;
isReplacementDone = true;
}
}
if (isReplacementDone)
{
CompatDirectDrawPalette::s_origVtable.SetEntries(
CompatPrimarySurface::palette, 0, 0, 256, newEntries);
}
}
void unlockPrimarySurface()
{
GdiFlush();
@ -276,6 +310,7 @@ namespace CompatGdi
if (0 != memcmp(usedPaletteEntries, g_usedPaletteEntries, sizeof(usedPaletteEntries)))
{
replaceDuplicateWhitePaletteEntries(usedPaletteEntries);
invalidate(nullptr);
}
}