fix copyTo to only copy the minimum pixels per row, and to lock the src before
trying to access its colorTable. Update unittest for copyTo. Add sample for
using a mask to clip a layer.
git-svn-id: http://skia.googlecode.com/svn/trunk@168 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleLayerMask.cpp b/samplecode/SampleLayerMask.cpp
new file mode 100644
index 0000000..8cbe76d
--- /dev/null
+++ b/samplecode/SampleLayerMask.cpp
@@ -0,0 +1,73 @@
+#include "SampleCode.h"
+#include "SkCanvas.h"
+#include "SkPaint.h"
+#include "SkPorterDuff.h"
+#include "SkView.h"
+
+///////////////////////////////////////////////////////////////////////////////
+
+class LayerMaskView : public SkView {
+public:
+ LayerMaskView() {}
+
+protected:
+ // overrides from SkEventSink
+ virtual bool onQuery(SkEvent* evt) {
+ if (SampleCode::TitleQ(*evt)) {
+ SampleCode::TitleR(evt, "LayerMask");
+ return true;
+ }
+ return this->INHERITED::onQuery(evt);
+ }
+
+ void drawMask(SkCanvas* canvas, const SkRect& r) {
+ SkPaint paint;
+ paint.setAntiAlias(true);
+
+ if (true) {
+ SkBitmap mask;
+ int w = SkScalarRound(r.width());
+ int h = SkScalarRound(r.height());
+ mask.setConfig(SkBitmap::kARGB_8888_Config, w, h);
+ mask.allocPixels();
+ mask.eraseColor(0);
+ SkCanvas c(mask);
+ SkRect bounds = r;
+ bounds.offset(-bounds.fLeft, -bounds.fTop);
+ c.drawOval(bounds, paint);
+
+ paint.setPorterDuffXfermode(SkPorterDuff::kDstIn_Mode);
+ canvas->drawBitmap(mask, r.fLeft, r.fTop, &paint);
+ } else {
+ SkPath p;
+ p.addOval(r);
+ p.setFillType(SkPath::kInverseWinding_FillType);
+ paint.setPorterDuffXfermode(SkPorterDuff::kDstOut_Mode);
+ canvas->drawPath(p, paint);
+ }
+ }
+
+ void drawBG(SkCanvas* canvas) {
+ canvas->drawColor(0xFFDDDDDD);
+ }
+
+ virtual void onDraw(SkCanvas* canvas) {
+ this->drawBG(canvas);
+
+ SkRect r;
+ r.set(SkIntToScalar(20), SkIntToScalar(20), SkIntToScalar(120), SkIntToScalar(120));
+ canvas->saveLayer(&r, NULL, SkCanvas::kARGB_ClipLayer_SaveFlag);
+ canvas->drawColor(SK_ColorRED);
+ drawMask(canvas, r);
+ canvas->restore();
+ }
+
+private:
+ typedef SkView INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new LayerMaskView; }
+static SkViewRegister reg(MyFactory);
+