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gdiplus: Introduce absdiff helper. 

Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Esme Povirk <vincent@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Jacek Caban 2020-05-27 23:55:18 +02:00 committed by Alexandre Julliard
parent d17b009bf6
commit cca639fa64
1 changed files with 6 additions and 1 deletions
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7
dlls/gdiplus/image.c
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@ -380,6 +380,11 @@ GpStatus WINGDIPAPI GdipBitmapGetPixel(GpBitmap* bitmap, INT x, INT y,
return Ok;
}
static unsigned int absdiff(unsigned int x, unsigned int y)
{
return x > y ? x - y : y - x;
}
static inline UINT get_palette_index(BYTE r, BYTE g, BYTE b, BYTE a, ColorPalette *palette)
{
BYTE index = 0;
@ -399,7 +404,7 @@ static inline UINT get_palette_index(BYTE r, BYTE g, BYTE b, BYTE a, ColorPalett
*/
for(i=0;i<palette->Count;i++) {
ARGB color=palette->Entries[i];
distance=abs(b-(color & 0xff)) + abs(g-(color>>8 & 0xff)) + abs(r-(color>>16 & 0xff)) + abs(a-(color>>24 & 0xff));
distance=absdiff(b, color & 0xff) + absdiff(g, color>>8 & 0xff) + absdiff(r, color>>16 & 0xff) + absdiff(a, color>>24 & 0xff);
if (distance<best_distance) {
best_distance=distance;
index=i;