78 lines
1.4 KiB
C++
78 lines
1.4 KiB
C++
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/*++
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Copyright (c) 1999 Microsoft Corporation
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Module Name:
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TonkaConstruction.cpp
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Abstract:
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Workaround for GDI behavior difference when bltting palettized bitmaps. On
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Win9x GDI first looked at the current index for a color match when building
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a lookup table, but on NT, it simply searches from the beginning. This
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breaks palette animation. The fix is to make sure that the entries that are
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animated are different from all the others.
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Notes:
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This is an app specific shim.
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History:
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12/02/2001 linstev Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(TonkaConstruction)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(CreatePalette)
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APIHOOK_ENUM_END
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/*++
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Make sure index 10->15 are different from all other entries.
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--*/
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HPALETTE
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APIHOOK(CreatePalette)(
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CONST LOGPALETTE *lplgpl
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)
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{
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Restart:
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for (int i=10; i<=15; i++) {
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LPDWORD p1 = (DWORD *)&lplgpl->palPalEntry[i];
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for (int j=16; j<=255; j++) {
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LPDWORD p2 = (DWORD *)&lplgpl->palPalEntry[j];
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if (*p1 == *p2) {
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//
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// Entry is the same, so make it different
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//
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*p1 = *p1-1;
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goto Restart;
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}
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}
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}
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return ORIGINAL_API(CreatePalette)(lplgpl);
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}
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/*++
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Register hooked functions
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--*/
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HOOK_BEGIN
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APIHOOK_ENTRY(GDI32.DLL, CreatePalette)
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HOOK_END
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IMPLEMENT_SHIM_END
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