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gdiplus: Implement bilinear interpolation.

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Vincent Povirk 2011-03-10 11:03:39 -06:00 committed by Alexandre Julliard
parent 51cf90d8ca
commit 8b6dafda45
1 changed files with 34 additions and 0 deletions
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34
dlls/gdiplus/graphics.c
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@ -538,6 +538,40 @@ static ARGB resample_bitmap_pixel(GDIPCONST GpRect *src_rect, LPBYTE bits, UINT
if (!fixme++)
FIXME("Unimplemented interpolation %i\n", interpolation);
/* fall-through */
case InterpolationModeBilinear:
{
REAL leftxf, topyf;
INT leftx, rightx, topy, bottomy;
ARGB topleft, topright, bottomleft, bottomright;
ARGB top, bottom;
float x_offset;
leftxf = floorf(point->X);
leftx = (INT)leftxf;
rightx = (INT)ceilf(point->X);
topyf = floorf(point->Y);
topy = (INT)topyf;
bottomy = (INT)ceilf(point->Y);
if (leftx == rightx && topy == bottomy)
return sample_bitmap_pixel(src_rect, bits, width, height,
leftx, topy, attributes);
topleft = sample_bitmap_pixel(src_rect, bits, width, height,
leftx, topy, attributes);
topright = sample_bitmap_pixel(src_rect, bits, width, height,
rightx, topy, attributes);
bottomleft = sample_bitmap_pixel(src_rect, bits, width, height,
leftx, bottomy, attributes);
bottomright = sample_bitmap_pixel(src_rect, bits, width, height,
rightx, bottomy, attributes);
x_offset = point->X - leftxf;
top = blend_colors(topleft, topright, x_offset);
bottom = blend_colors(bottomleft, bottomright, x_offset);
return blend_colors(top, bottom, point->Y - topyf);
}
case InterpolationModeNearestNeighbor:
return sample_bitmap_pixel(src_rect, bits, width, height,
roundr(point->X), roundr(point->Y), attributes);