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gdiplus: Initialize the palettes of new indexed bitmaps.

oldstable
Vincent Povirk 2009-12-11 17:16:21 -06:00 committed by Alexandre Julliard
parent 9615dd8fdb
commit 6c040271c1
1 changed files with 68 additions and 0 deletions
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68
dlls/gdiplus/image.c
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@ -1134,6 +1134,44 @@ GpStatus WINGDIPAPI GdipCreateBitmapFromHICON(HICON hicon, GpBitmap** bitmap)
return Ok;
}
static void generate_halftone_palette(ARGB *entries, UINT count)
{
static const BYTE halftone_values[6]={0x00,0x33,0x66,0x99,0xcc,0xff};
UINT i;
for (i=0; i<8 && i<count; i++)
{
entries[i] = 0xff000000;
if (i&1) entries[i] |= 0x800000;
if (i&2) entries[i] |= 0x8000;
if (i&4) entries[i] |= 0x80;
}
if (8 < count)
entries[i] = 0xffc0c0c0;
for (i=9; i<16 && i<count; i++)
{
entries[i] = 0xff000000;
if (i&1) entries[i] |= 0xff0000;
if (i&2) entries[i] |= 0xff00;
if (i&4) entries[i] |= 0xff;
}
for (i=16; i<40 && i<count; i++)
{
entries[i] = 0;
}
for (i=40; i<256 && i<count; i++)
{
entries[i] = 0xff000000;
entries[i] |= halftone_values[(i-40)%6];
entries[i] |= halftone_values[((i-40)/6)%6] << 8;
entries[i] |= halftone_values[((i-40)/36)%6] << 16;
}
}
GpStatus WINGDIPAPI GdipCreateBitmapFromScan0(INT width, INT height, INT stride,
PixelFormat format, BYTE* scan0, GpBitmap** bitmap)
{
@ -1214,6 +1252,36 @@ GpStatus WINGDIPAPI GdipCreateBitmapFromScan0(INT width, INT height, INT stride,
(*bitmap)->bits = bits;
(*bitmap)->stride = dib_stride;
if (format == PixelFormat1bppIndexed ||
format == PixelFormat4bppIndexed ||
format == PixelFormat8bppIndexed)
{
(*bitmap)->image.palette_size = (*bitmap)->image.palette_count = 1 << PIXELFORMATBPP(format);
(*bitmap)->image.palette_entries = GdipAlloc(sizeof(ARGB) * ((*bitmap)->image.palette_size));
if (!(*bitmap)->image.palette_entries)
{
GdipDisposeImage(&(*bitmap)->image);
*bitmap = NULL;
return OutOfMemory;
}
if (format == PixelFormat1bppIndexed)
{
(*bitmap)->image.palette_flags = PaletteFlagsGrayScale;
(*bitmap)->image.palette_entries[0] = 0xff000000;
(*bitmap)->image.palette_entries[1] = 0xffffffff;
}
else
{
if (format == PixelFormat8bppIndexed)
(*bitmap)->image.palette_flags = PaletteFlagsHalftone;
generate_halftone_palette((*bitmap)->image.palette_entries,
(*bitmap)->image.palette_count);
}
}
return Ok;
}