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add isClipEmpty() -- encourage clients to call this rather than checking clipFoo() results

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BUG=skia:
R=robertphillips@google.com

Review URL: https://codereview.chromium.org/177073006

git-svn-id: http://skia.googlecode.com/svn/trunk@13568 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
reed@google.com 2014-02-24 19:38:20 +00:00
parent 5cc25359c6
commit 754de5f65b
2 changed files with 13 additions and 0 deletions
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9
include/core/SkCanvas.h
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@ -972,6 +972,15 @@ public:
//////////////////////////////////////////////////////////////////////////
/**
* Return true if the current clip is empty (i.e. nothing will draw).
* Note: this is not always a free call, so it should not be used
* more often than necessary. However, once the canvas has computed this
* result, subsequent calls will be cheap (until the clip state changes,
* which can happen on any clip..() or restore() call.
*/
bool isClipEmpty() const;
/** Return the current matrix on the canvas.
This does not account for the translate in any of the devices.
@return The current matrix on the canvas.

4
src/core/SkCanvas.cpp
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@ -1484,6 +1484,10 @@ void SkCanvas::replayClips(ClipVisitor* visitor) const {
///////////////////////////////////////////////////////////////////////////////
bool SkCanvas::isClipEmpty() const {
return fMCRec->fRasterClip->isEmpty();
}
bool SkCanvas::quickReject(const SkRect& rect) const {
if (!rect.isFinite())