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Optimization of preview widget scaling.

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Thanks to Campbell for pointing into issues.
This commit is contained in:
Sergey Sharybin 2011-12-04 18:39:47 +00:00
parent 756ac13e3a
commit 9e51f4b943
1 changed files with 8 additions and 4 deletions
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12
source/blender/editors/interface/interface_draw.c
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@ -1475,16 +1475,20 @@ static ImBuf *scale_trackpreview_ibuf(ImBuf *ibuf, float zoomx, float zoomy)
{
ImBuf *scaleibuf;
int x, y, w= ibuf->x*zoomx, h= ibuf->y*zoomy;
const float max_x= ibuf->x-1.0f;
const float max_y= ibuf->y-1.0f;
const float scalex= 1.0f/zoomx;
const float scaley= 1.0f/zoomy;
scaleibuf= IMB_allocImBuf(w, h, 32, IB_rect);
for(y= 0; y<scaleibuf->y; y++) {
for (x= 0; x<scaleibuf->x; x++) {
float src_x= ((float)x)/zoomx;
float src_y= ((float)y)/zoomy;
float src_x= scalex*x;
float src_y= scaley*y;
CLAMP(src_x, 0, ibuf->x-1.0f);
CLAMP(src_y, 0, ibuf->y-1.0f);
CLAMP(src_x, 0, max_x);
CLAMP(src_y, 0, max_y);
bilinear_interpolation(ibuf, scaleibuf, src_x, src_y, x, y);
}