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chop down huge rects before hairlining

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Bug: skia:
Change-Id: I18f4b1dc4f279e37832d4bced0a66b5c356d09c0
Reviewed-on: https://skia-review.googlesource.com/112572
Reviewed-by: Yuqian Li <liyuqian@google.com>
Commit-Queue: Mike Reed <reed@google.com>
This commit is contained in:
Mike Reed 2018-03-07 13:35:31 -05:00 committed by Skia Commit-Bot
parent 73fb0c97e4
commit c7fbda9540
1 changed files with 17 additions and 6 deletions
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21
src/core/SkScan_Hairline.cpp
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@ -144,14 +144,25 @@ void SkScan::HairLineRgn(const SkPoint array[], int arrayCount, const SkRegion*
// we don't just draw 4 lines, 'cause that can leave a gap in the bottom-right
// and double-hit the top-left.
void SkScan::HairRect(const SkRect& rect, const SkRasterClip& clip,
SkBlitter* blitter) {
void SkScan::HairRect(const SkRect& rect, const SkRasterClip& clip, SkBlitter* blitter) {
SkAAClipBlitterWrapper wrapper;
SkBlitterClipper clipper;
const SkIRect r = SkIRect::MakeLTRB(SkScalarFloorToInt(rect.fLeft),
// Create the enclosing bounds of the hairrect. i.e. we will stroke the interior of r.
SkIRect r = SkIRect::MakeLTRB(SkScalarFloorToInt(rect.fLeft),
SkScalarFloorToInt(rect.fTop),
SkScalarFloorToInt(rect.fRight) + 1,
SkScalarFloorToInt(rect.fBottom) + 1);
SkScalarFloorToInt(rect.fRight + 1),
SkScalarFloorToInt(rect.fBottom + 1));
// Note: r might be crazy big, if rect was huge, possibly getting pinned to max/min s32.
// We need to trim it back to something reasonable before we can query its width etc.
// since r.fRight - r.fLeft might wrap around to negative even if fRight > fLeft.
//
// We outset the clip bounds by 1 before intersecting, since r is being stroked and not filled
// so we don't want to pin an edge of it to the clip. The intersect's job is mostly to just
// get the actual edge values into a reasonable range (e.g. so width() can't overflow).
if (!r.intersect(clip.getBounds().makeOutset(1, 1))) {
return;
}
if (clip.quickReject(r)) {
return;