add gm to test edge case in drawBitmapRectToRect
git-svn-id: http://skia.googlecode.com/svn/trunk@8698 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/bitmaprecttest.cpp b/gm/bitmaprecttest.cpp
new file mode 100644
index 0000000..701aadc
--- /dev/null
+++ b/gm/bitmaprecttest.cpp
@@ -0,0 +1,67 @@
+/*
+ * 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 "SkCanvas.h"
+
+static void make_bm(SkBitmap* bm) {
+ bm->setConfig(SkBitmap::kARGB_8888_Config, 60, 60);
+ bm->allocPixels();
+ bm->eraseColor(0);
+
+ SkCanvas canvas(*bm);
+ SkPaint paint;
+ paint.setStyle(SkPaint::kStroke_Style);
+ canvas.drawRect(SkRect::MakeLTRB(0.5f, 0.5f, 29.5f, 29.5f), paint);
+}
+
+// This creates a close, but imperfect concatenation of
+// scaling the image up by its dst-rect
+// scaling the image down by the matrix' scale
+// The bug was that for cases like this, we were incorrectly trying to take a
+// fast-path in the bitmapshader, but ended up drawing the last col of pixels
+// twice. The fix resulted in (a) not taking the fast-path, but (b) drawing
+// the image correctly.
+//
+static void test_bitmaprect(SkCanvas* canvas) {
+ SkBitmap bm;
+ make_bm(&bm);
+
+ canvas->drawBitmap(bm, 150, 45, NULL);
+
+ SkScalar scale = 0.452560018f;
+ canvas->scale(scale, scale);
+ canvas->drawBitmapRectToRect(bm, NULL, SkRect::MakeXYWH(100, 100, 128, 128), NULL);
+}
+
+class BitmapRectTestGM : public skiagm::GM {
+public:
+ BitmapRectTestGM() {
+
+ }
+
+protected:
+ virtual SkString onShortName() {
+ return SkString("bitmaprectest");
+ }
+
+ virtual SkISize onISize() {
+ return SkISize::Make(320, 240);
+ }
+
+ virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+ test_bitmaprect(canvas);
+ }
+
+private:
+ typedef skiagm::GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+DEF_GM( return new BitmapRectTestGM; )
+