Implement edge AA for concave polys in the tesselated path renderer.
Review URL: http://codereview.appspot.com/4571072/
git-svn-id: http://skia.googlecode.com/svn/trunk@1600 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleConcavePaths.cpp b/samplecode/SampleConcavePaths.cpp
new file mode 100644
index 0000000..e084af2
--- /dev/null
+++ b/samplecode/SampleConcavePaths.cpp
@@ -0,0 +1,146 @@
+
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkGradientShader.h"
+#include "SkGraphics.h"
+#include "SkImageDecoder.h"
+#include "SkPath.h"
+#include "SkRegion.h"
+#include "SkShader.h"
+#include "SkUtils.h"
+#include "SkXfermode.h"
+#include "SkColorPriv.h"
+#include "SkColorFilter.h"
+#include "SkParsePath.h"
+#include "SkTime.h"
+#include "SkTypeface.h"
+
+#include "SkGeometry.h"
+
+class ConcavePathView : public SampleView {
+public:
+ ConcavePathView() {}
+
+protected:
+ // overrides from SkEventSink
+ virtual bool onQuery(SkEvent* evt) {
+ if (SampleCode::TitleQ(*evt)) {
+ SampleCode::TitleR(evt, "ConcavePaths");
+ return true;
+ }
+ return this->INHERITED::onQuery(evt);
+ }
+
+ virtual void onDrawContent(SkCanvas* canvas) {
+ SkPaint paint;
+
+ paint.setAntiAlias(true);
+ paint.setStyle(SkPaint::kFill_Style);
+
+ // Concave test
+ if (1) {
+ SkPath path;
+ canvas->translate(0, 0);
+ path.moveTo(SkIntToScalar(20), SkIntToScalar(20));
+ path.lineTo(SkIntToScalar(80), SkIntToScalar(20));
+ path.lineTo(SkIntToScalar(30), SkIntToScalar(30));
+ path.lineTo(SkIntToScalar(20), SkIntToScalar(80));
+ canvas->drawPath(path, paint);
+ }
+ // Reverse concave test
+ if (1) {
+ SkPath path;
+ canvas->save();
+ canvas->translate(100, 0);
+ path.moveTo(SkIntToScalar(20), SkIntToScalar(20));
+ path.lineTo(SkIntToScalar(20), SkIntToScalar(80));
+ path.lineTo(SkIntToScalar(30), SkIntToScalar(30));
+ path.lineTo(SkIntToScalar(80), SkIntToScalar(20));
+ canvas->drawPath(path, paint);
+ canvas->restore();
+ }
+ // Bowtie (intersection)
+ if (1) {
+ SkPath path;
+ canvas->save();
+ canvas->translate(200, 0);
+ path.moveTo(SkIntToScalar(20), SkIntToScalar(20));
+ path.lineTo(SkIntToScalar(80), SkIntToScalar(80));
+ path.lineTo(SkIntToScalar(80), SkIntToScalar(20));
+ path.lineTo(SkIntToScalar(20), SkIntToScalar(80));
+ canvas->drawPath(path, paint);
+ canvas->restore();
+ }
+ // "fake" bowtie (concave, but no intersection)
+ if (1) {
+ SkPath path;
+ canvas->save();
+ canvas->translate(300, 0);
+ path.moveTo(SkIntToScalar(20), SkIntToScalar(20));
+ path.lineTo(SkIntToScalar(50), SkIntToScalar(40));
+ path.lineTo(SkIntToScalar(80), SkIntToScalar(20));
+ path.lineTo(SkIntToScalar(80), SkIntToScalar(80));
+ path.lineTo(SkIntToScalar(50), SkIntToScalar(60));
+ path.lineTo(SkIntToScalar(20), SkIntToScalar(80));
+ canvas->drawPath(path, paint);
+ canvas->restore();
+ }
+ // Fish test (intersection/concave)
+ if (1) {
+ SkPath path;
+ canvas->save();
+ canvas->translate(0, 100);
+ path.moveTo(SkIntToScalar(20), SkIntToScalar(20));
+ path.lineTo(SkIntToScalar(80), SkIntToScalar(80));
+ path.lineTo(SkIntToScalar(70), SkIntToScalar(50));
+ path.lineTo(SkIntToScalar(80), SkIntToScalar(20));
+ path.lineTo(SkIntToScalar(20), SkIntToScalar(80));
+ path.lineTo(SkIntToScalar(0), SkIntToScalar(50));
+ canvas->drawPath(path, paint);
+ canvas->restore();
+ }
+ // Collinear test
+ if (1) {
+ SkPath path;
+ canvas->save();
+ canvas->translate(100, 100);
+ path.moveTo(SkIntToScalar(20), SkIntToScalar(20));
+ path.lineTo(SkIntToScalar(50), SkIntToScalar(20));
+ path.lineTo(SkIntToScalar(80), SkIntToScalar(20));
+ path.lineTo(SkIntToScalar(50), SkIntToScalar(80));
+ canvas->drawPath(path, paint);
+ canvas->restore();
+ }
+ // Hole test
+ if (1) {
+ SkPath path;
+ canvas->save();
+ canvas->translate(200, 100);
+ path.moveTo(SkIntToScalar(20), SkIntToScalar(20));
+ path.lineTo(SkIntToScalar(80), SkIntToScalar(20));
+ path.lineTo(SkIntToScalar(80), SkIntToScalar(80));
+ path.lineTo(SkIntToScalar(20), SkIntToScalar(80));
+ path.moveTo(SkIntToScalar(30), SkIntToScalar(30));
+ path.lineTo(SkIntToScalar(30), SkIntToScalar(70));
+ path.lineTo(SkIntToScalar(70), SkIntToScalar(70));
+ path.lineTo(SkIntToScalar(70), SkIntToScalar(30));
+ canvas->drawPath(path, paint);
+ canvas->restore();
+ }
+ }
+
+ virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
+ this->inval(NULL);
+ return this->INHERITED::onFindClickHandler(x, y);
+ }
+
+private:
+ typedef SampleView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new ConcavePathView; }
+static SkViewRegister reg(MyFactory);
+