add simple test for writepixels

git-svn-id: http://skia.googlecode.com/svn/trunk@1972 2bbb7eff-a529-9590-31e7-b0007b416f81

samplecode/SampleWritePixels.cpp

@@ -0,0 +1,63 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkCornerPathEffect.h"
+#include "SkCullPoints.h"
+#include "SkGradientShader.h"
+#include "SkPath.h"
+#include "SkRegion.h"
+#include "SkShader.h"
+#include "SkUtils.h"
+
+static void create_bitmap(SkBitmap* bitmap) {
+    const int W = 100;
+    const int H = 100;
+    bitmap->setConfig(SkBitmap::kARGB_8888_Config, W, H);
+    bitmap->allocPixels();
+
+    SkCanvas canvas(*bitmap);
+    canvas.drawColor(SK_ColorRED);
+    SkPaint paint;
+    paint.setColor(SK_ColorBLUE);
+    canvas.drawCircle(SkIntToScalar(W)/2, SkIntToScalar(H)/2, SkIntToScalar(W)/2, paint);
+}
+
+class WritePixelsView : public SampleView {
+    SkPath fPath;
+public:
+	WritePixelsView() {}
+    
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt) {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, "WritePixels");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+    
+    virtual void onDrawContent(SkCanvas* canvas) {
+        SkBitmap bitmap;
+        create_bitmap(&bitmap);
+        int x = bitmap.width() / 2;
+        int y = bitmap.height() / 2;
+        
+        SkBitmap subset;
+        bitmap.extractSubset(&subset, SkIRect::MakeXYWH(x, y, x, y));
+
+        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
+
+        canvas->writePixels(bitmap, 0, 0);
+        canvas->writePixels(subset, 0, 0);
+    }
+    
+private:
+    typedef SampleView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new WritePixelsView; }
+static SkViewRegister reg(MyFactory);
+