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gdiplus: Implement gamma adjustment.

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This commit is contained in:
Vincent Povirk 2011-03-24 17:31:57 -05:00 committed by Alexandre Julliard
parent 805f0321eb
commit 19b71b035e
2 changed files with 26 additions and 4 deletions
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28
dlls/gdiplus/graphics.c
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@ -467,9 +467,31 @@ static void apply_image_attributes(const GpImageAttributes *attributes, LPBYTE d
if (attributes->gamma_enabled[type] ||
attributes->gamma_enabled[ColorAdjustTypeDefault])
{
static int fixme;
if (!fixme++)
FIXME("Gamma adjustment not implemented\n");
REAL gamma;
if (attributes->gamma_enabled[type])
gamma = attributes->gamma[type];
else
gamma = attributes->gamma[ColorAdjustTypeDefault];
for (x=0; x<width; x++)
for (y=0; y<height; y++)
{
ARGB *src_color;
BYTE blue, green, red;
src_color = (ARGB*)(data + stride * y + sizeof(ARGB) * x);
blue = *src_color&0xff;
green = (*src_color>>8)&0xff;
red = (*src_color>>16)&0xff;
/* FIXME: We should probably use a table for this. */
blue = floorf(powf(blue / 255.0, gamma) * 255.0);
green = floorf(powf(green / 255.0, gamma) * 255.0);
red = floorf(powf(red / 255.0, gamma) * 255.0);
*src_color = (*src_color & 0xff000000) | (red << 16) | (green << 8) | blue;
}
}
}

2
dlls/gdiplus/tests/image.c
View File

@ -2085,7 +2085,7 @@ static void test_gamma(void)
stat = GdipBitmapGetPixel(bitmap2, 0, 0, &color);
expect(Ok, stat);
todo_wine ok(color_match(0xff20ffff, color, 1), "Expected ff20ffff, got %.8x\n", color);
ok(color_match(0xff20ffff, color, 1), "Expected ff20ffff, got %.8x\n", color);
GdipDeleteGraphics(graphics);
GdipDisposeImage((GpImage*)bitmap1);