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clip by adjusting pointer

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BUG=302
TEST=ARGBScaleDownClipBy2_None
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/6529004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@945 16f28f9a-4ce2-e073-06de-1de4eb20be90
This commit is contained in:
fbarchard@google.com 2014-01-03 01:43:21 +00:00
parent 6dc80ab585
commit 667de22fd3
1 changed files with 6 additions and 2 deletions
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8
source/scale_argb.cc
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@ -676,11 +676,15 @@ static void ScaleARGB(const uint8* src, int src_stride,
ScaleSlope(src_width, src_height, dst_width, dst_height, filtering,
&x, &y, &dx, &dy);
if (clip_x) {
x += clip_x * dx;
int64 clipf = static_cast<int64>(clip_x) * dx;
x += (clipf & 0xffff);
src += (clipf >> 16) * 4;
dst += clip_x * 4;
}
if (clip_y) {
y += clip_y * dy;
int64 clipf = static_cast<int64>(clip_y) * dy;
y += (clipf & 0xffff);
src += (clipf >> 16) * src_stride;
dst += clip_y * dst_stride;
}