Properly handle extracted bitmaps in cross process/shared addr space SkGPipe.

Use the pixel ref which we have already copied and the appropriate pixel ref
offset.

Turn SampleDrawBitmap into a GM to test this functionality.

Review URL: https://codereview.appspot.com/6348059

git-svn-id: http://skia.googlecode.com/svn/trunk@4417 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 86 insertions, 0 deletions

diff --git a/gm/extractbitmap.cpp b/gm/extractbitmap.cpp
new file mode 100644
index 0000000000..5002f1b22a
--- /dev/null
+++ b/gm/extractbitmap.cpp
@@ -0,0 +1,86 @@
+
+/*
+ * Copyright 2011 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 "SkBitmap.h"
+#include "SkCanvas.h"
+#include "SkDevice.h"
+#include "SkString.h"
+
+namespace skiagm {
+
+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 ExtractBitmapGM : public GM {
+public:
+    ExtractBitmapGM() {}
+    
+protected:
+    // overrides from SkEventSink
+    virtual SkString onShortName() SK_OVERRIDE {
+        return SkString("extractbitmap");
+    }
+
+    virtual SkISize onISize() SK_OVERRIDE {
+        return make_isize(600, 600);
+    }
+
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+        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->drawBitmap(bitmap, 0, 0);
+        canvas->drawBitmap(subset, 0, 0);
+
+        // Now do the same but with a device bitmap as source image
+        SkRefPtr<SkDevice> primaryDevice(canvas->getDevice());
+        SkRefPtr<SkDevice> secondDevice(canvas->createCompatibleDevice(
+            SkBitmap::kARGB_8888_Config, bitmap.width(), 
+            bitmap.height(), true));
+        secondDevice->unref();
+        SkCanvas secondCanvas(secondDevice.get());
+        secondCanvas.writePixels(bitmap, 0, 0);
+
+        SkBitmap deviceBitmap = secondDevice->accessBitmap(false);
+        SkBitmap deviceSubset;
+        deviceBitmap.extractSubset(&deviceSubset, 
+             SkIRect::MakeXYWH(x, y, x, y));
+
+        canvas->translate(SkIntToScalar(120), SkIntToScalar(0));
+
+        canvas->drawBitmap(deviceBitmap, 0, 0);
+        canvas->drawBitmap(deviceSubset, 0, 0);
+
+    }
+    
+private:
+    typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static GM* MyFactory(void*) { return new ExtractBitmapGM; }
+static GMRegistry reg(MyFactory);
+
+}