Add GM to repro crbug.com/472795
This CL also adds a new parameter to SkBitmapSource which gives the user control of the filter quality.
BUG=472795
Review URL: https://codereview.chromium.org/1072603002
diff --git a/gm/bitmapsource2.cpp b/gm/bitmapsource2.cpp
new file mode 100644
index 0000000..bc4acf7
--- /dev/null
+++ b/gm/bitmapsource2.cpp
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2015 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"
+
+namespace skiagm {
+
+// This GM reproduces the issue in crbug.com/472795. The SkBitmapSource image
+// is shifted for high quality mode between cpu and gpu.
+class BitmapSourceGM : public GM {
+public:
+ BitmapSourceGM(const char* suffix, SkFilterQuality filter) : fSuffix(suffix), fFilter(filter) {
+ this->setBGColor(0xFFFFFFFF);
+ }
+
+protected:
+ SkString onShortName() override {
+ SkString name("bitmapsrc2_");
+ name.append(fSuffix);
+ return name;
+ }
+
+ SkISize onISize() override { return SkISize::Make(256, 256); }
+
+ // Create a bitmap with high frequency vertical stripes
+ void onOnceBeforeDraw() override {
+ static const SkPMColor gColors[] = {
+ SK_ColorRED, SK_ColorGRAY,
+ SK_ColorGREEN, SK_ColorGRAY,
+ SK_ColorBLUE, SK_ColorGRAY,
+ SK_ColorCYAN, SK_ColorGRAY,
+ SK_ColorMAGENTA, SK_ColorGRAY,
+ SK_ColorYELLOW, SK_ColorGRAY,
+ SK_ColorWHITE, SK_ColorGRAY,
+ };
+
+ fBM.allocN32Pixels(kImageSize, kImageSize, true);
+
+ SkCanvas canvas(fBM);
+
+ int curColor = 0;
+
+ for (int x = 0; x < kImageSize; x += 3) {
+ SkRect r = SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(0),
+ SkIntToScalar(3), SkIntToScalar(kImageSize));
+ SkPaint p;
+ p.setColor(gColors[curColor]);
+ canvas.drawRect(r, p);
+
+ curColor = (curColor+1) % SK_ARRAY_COUNT(gColors);
+ }
+ }
+
+ void onDraw(SkCanvas* canvas) override {
+ SkRect srcRect = SkRect::MakeLTRB(0, 0,
+ SkIntToScalar(kImageSize), SkIntToScalar(kImageSize));
+ SkRect dstRect = SkRect::MakeLTRB(0.75f, 0.75f, 225.75f, 225.75f);
+
+ SkAutoTUnref<SkImageFilter> filter(SkBitmapSource::Create(fBM, srcRect, dstRect, fFilter));
+
+ SkPaint p;
+ p.setImageFilter(filter);
+
+ canvas->saveLayer(NULL, &p);
+ canvas->restore();
+ }
+
+private:
+ static const int kImageSize = 503;
+
+ SkString fSuffix;
+ SkFilterQuality fFilter;
+ SkBitmap fBM;
+
+ typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+DEF_GM( return SkNEW_ARGS(BitmapSourceGM, ("none", kNone_SkFilterQuality) ); )
+DEF_GM( return SkNEW_ARGS(BitmapSourceGM, ("low", kLow_SkFilterQuality) ); )
+DEF_GM( return SkNEW_ARGS(BitmapSourceGM, ("med", kMedium_SkFilterQuality) ); )
+DEF_GM( return SkNEW_ARGS(BitmapSourceGM, ("high", kHigh_SkFilterQuality) ); )
+
+}