Implement srcRect and dstRect functionality in SkBitmapSource. This is required for the "preserveAs…

gm/bitmapsource.cpp

+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gm.h"
+
+#include "SkBitmapSource.h"
+
+class BitmapSourceGM : public skiagm::GM {
+public:
+    BitmapSourceGM() : fInitialized(false) {
+    }
+
+protected:
+    virtual SkString onShortName() {
+        return SkString("bitmapsource");
+    }
+
+    void make_bitmap() {
+        fBitmap.setConfig(SkBitmap::kARGB_8888_Config, 100, 100);
+        fBitmap.allocPixels();
+        SkBitmapDevice device(fBitmap);
+        SkCanvas canvas(&device);
+        canvas.clear(0x00000000);
+        SkPaint paint;
+        paint.setAntiAlias(true);
+        paint.setColor(0xFFFFFFFF);
+        paint.setTextSize(SkIntToScalar(96));
+        const char* str = "e";
+        canvas.drawText(str, strlen(str), SkIntToScalar(20), SkIntToScalar(70), paint);
+    }
+
+    virtual SkISize onISize() { return SkISize::Make(500, 150); }
+
+    virtual void onDraw(SkCanvas* canvas) {
+        if (!fInitialized) {
+            this->make_bitmap();
+            fInitialized = true;
+        }
+        canvas->clear(0x00000000);
+        {
+            SkRect srcRect = SkRect::MakeXYWH(20, 20, 30, 30);
+            SkRect dstRect = SkRect::MakeXYWH(0, 10, 60, 60);
+            SkRect clipRect = SkRect::MakeXYWH(0, 0, 100, 100);
+            SkAutoTUnref<SkImageFilter> bitmapSource(new SkBitmapSource(fBitmap));
+            SkAutoTUnref<SkImageFilter> bitmapSourceSrcRect(new SkBitmapSource(fBitmap, &srcRect));
+            SkAutoTUnref<SkImageFilter> bitmapSourceSrcRectDstRect(new SkBitmapSource(fBitmap, &srcRect, &dstRect));
+            SkAutoTUnref<SkImageFilter> bitmapSourceDstRectOnly(new SkBitmapSource(fBitmap, NULL, &dstRect));
+
+            SkPaint paint;
+            paint.setImageFilter(bitmapSource);
+            canvas->save();
+            canvas->clipRect(clipRect);
+            canvas->drawPaint(paint);
+            canvas->restore();
+            canvas->translate(SkIntToScalar(100), 0);
+
+            paint.setImageFilter(bitmapSourceSrcRect);
+            canvas->save();
+            canvas->clipRect(clipRect);
+            canvas->drawPaint(paint);
+            canvas->restore();
+            canvas->translate(SkIntToScalar(100), 0);
+
+            paint.setImageFilter(bitmapSourceSrcRectDstRect);
+            canvas->save();
+            canvas->clipRect(clipRect);
+            canvas->drawPaint(paint);
+            canvas->restore();
+            canvas->translate(SkIntToScalar(100), 0);
+
+            paint.setImageFilter(bitmapSourceDstRectOnly);
+            canvas->save();
+            canvas->clipRect(clipRect);
+            canvas->drawPaint(paint);
+            canvas->restore();
+            canvas->translate(SkIntToScalar(100), 0);
+        }
+    }
+
+private:
+    typedef GM INHERITED;
+    SkBitmap fBitmap;
+    bool fInitialized;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+static skiagm::GM* MyFactory(void*) { return new BitmapSourceGM; }
+static skiagm::GMRegistry reg(MyFactory);