Chop quads exactly on the clip bounds, so we don't spend CPU cycles walking them

when we're above or below the clip.

Still to do:
- chop in X to avoid 16.16. overflow in the edgelist
- apply the same logic for cubics (tho much harder math)



git-svn-id: http://skia.googlecode.com/svn/trunk@88 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 85 insertions, 0 deletions

diff --git a/samplecode/SamplePathClip.cpp b/samplecode/SamplePathClip.cpp
new file mode 100644
index 0000000000..f4dd032d13
--- /dev/null
+++ b/samplecode/SamplePathClip.cpp
@@ -0,0 +1,85 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkGradientShader.h"
+#include "SkGraphics.h"
+#include "SkImageDecoder.h"
+#include "SkPath.h"
+#include "SkPorterDuff.h"
+#include "SkRegion.h"
+#include "SkShader.h"
+#include "SkUtils.h"
+#include "SkXfermode.h"
+#include "SkColorPriv.h"
+#include "SkColorFilter.h"
+#include "SkTime.h"
+#include "SkTypeface.h"
+
+class PathClipView : public SkView {
+public:
+    SkRect fOval;
+    SkPoint fCenter;
+
+	PathClipView() {
+        fOval.set(0, 0, SkIntToScalar(200), SkIntToScalar(50));
+        fCenter.set(SkIntToScalar(250), SkIntToScalar(250));
+    }
+    
+    virtual ~PathClipView() {}
+    
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt) {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, "PathClip");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+    
+    void drawBG(SkCanvas* canvas) {
+        canvas->drawColor(SK_ColorWHITE);
+    }
+    
+    virtual void onDraw(SkCanvas* canvas) {
+        this->drawBG(canvas);
+        
+        SkRect oval = fOval;
+        oval.offset(fCenter.fX - oval.centerX(), fCenter.fY - oval.centerY());
+        
+        SkPaint p;
+        p.setAntiAlias(true);
+        
+        p.setStyle(SkPaint::kStroke_Style);
+        canvas->drawOval(oval, p);
+
+        SkRect r;
+        r.set(SkIntToScalar(200), SkIntToScalar(200),
+              SkIntToScalar(300), SkIntToScalar(300));
+        canvas->clipRect(r);
+        
+        p.setStyle(SkPaint::kFill_Style);
+        p.setColor(SK_ColorRED);
+        canvas->drawRect(r, p);
+     
+        p.setColor(0x800000FF);
+        r.set(SkIntToScalar(150), SkIntToScalar(10),
+              SkIntToScalar(250), SkIntToScalar(400));
+        canvas->drawOval(oval, p);
+    }
+    
+    virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
+        fCenter.set(x, y);
+        this->inval(NULL);
+        return NULL;
+    }
+    
+private:
+    typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new PathClipView; }
+static SkViewRegister reg(MyFactory);
+