new animated sample to show subpixel translate bug with high quality scaling

samplecode/SampleSubpixelTranslate.cpp

Index: samplecode/SampleSubpixelTranslate.cpp
diff --git a/samplecode/SampleSubpixelTranslate.cpp b/samplecode/SampleSubpixelTranslate.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..1644214b615748b4fdfa595c6897fac8db480b2b
--- /dev/null
+++ b/samplecode/SampleSubpixelTranslate.cpp
@@ -0,0 +1,95 @@
+
+/*
+ * Copyright 2014 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 "SampleCode.h"
+#include "SkBlurMaskFilter.h"
+#include "SkColorPriv.h"
+#include "SkCanvas.h"
+#include "SkImageDecoder.h"
+#include "SkRandom.h"
+#include "SkStream.h"
+
+

[robertphillips, 2014/05/29 21:18:23]

// comment - maybe include bug # ?

[humper, 2014/05/29 21:54:51]

Done.

+class SubpixelTranslateView : public SampleView {
+public:

[robertphillips, 2014/05/29 21:18:23]

overlength ?

[humper, 2014/05/29 21:54:51]

Done.

+    SubpixelTranslateView(const char imageFilename[], float horizontalVelocity, float verticalVelocity)
+      : fFilename(imageFilename),
+        fHorizontalVelocity(horizontalVelocity),
+        fVerticalVelocity(verticalVelocity) {
+      SkString path(skiagm::GM::GetResourcePath());
+      path.append("/");
+      path.append(fFilename);
+
+      SkImageDecoder *codec = NULL;
+      SkFILEStream stream(path.c_str());
+      if (stream.isValid()) {
+          codec = SkImageDecoder::Factory(&stream);
+      }
+      if (codec) {
+          stream.rewind();
+          codec->decode(&stream, &fBM, SkBitmap::kARGB_8888_Config,
+                        SkImageDecoder::kDecodePixels_Mode);
+          SkDELETE(codec);
+      } else {
+          fBM.allocN32Pixels(1, 1);
+          *(fBM.getAddr32(0,0)) = 0xFF0000FF; // red == bad
+      }
+      fCurPos = SkPoint::Make(0,0);
+      fSize = 200;
+    }
+
+protected:
+    SkBitmap fBM;
+    SkString fFilename;
+    int fSize;
+    float fHorizontalVelocity, fVerticalVelocity;
+
+    SkPoint fCurPos;
+
+    // overrides from SkEventSink

[robertphillips, 2014/05/29 21:18:23]

SK_OVERRIDE ?

[humper, 2014/05/29 21:54:51]

Done.

+    virtual bool onQuery(SkEvent* evt) {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, "SubpixelTranslate");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+

[robertphillips, 2014/05/29 21:18:23]

SK_OVERRIDE ?

[humper, 2014/05/29 21:54:51]

Done.

+    virtual void onDrawContent(SkCanvas* canvas) {
+
+        static const SkPaint::FilterLevel gLevels[] = {
+            SkPaint::kNone_FilterLevel,
+            SkPaint::kLow_FilterLevel,
+            SkPaint::kMedium_FilterLevel,
+            SkPaint::kHigh_FilterLevel
+        };
+
+        for (size_t i = 0; i < SK_ARRAY_COUNT(gLevels); ++i) {
+
+            SkPaint paint;
+            paint.setFilterLevel(gLevels[i]);
+
+            SkRect r = SkRect::MakeXYWH( fCurPos.fX + i * (fSize + 10), fCurPos.fY, fSize, fSize );
+
+            canvas->drawBitmapRect( fBM, r, &paint );
+        }
+
+        fCurPos.fX += fHorizontalVelocity;
+        fCurPos.fY += fVerticalVelocity;
+        this->inval(NULL);
+    }
+
+private:

[robertphillips, 2014/05/29 21:18:23]

SampleView ?

[humper, 2014/05/29 21:54:51]

Done.

+    typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new SubpixelTranslateView("mandrill_256.png", .05, .05); }
+static SkViewRegister reg(MyFactory);