add an animated test to verify that high-quality identity scaling doesn't change the image
BUG=skia:
R=reed@google.com
Author: humper@google.com
Review URL: https://codereview.chromium.org/454913002
diff --git a/gyp/SampleApp.gyp b/gyp/SampleApp.gyp
index d5a3479..6f39f71 100644
--- a/gyp/SampleApp.gyp
+++ b/gyp/SampleApp.gyp
@@ -72,6 +72,7 @@
'../samplecode/SampleHairCurves.cpp',
'../samplecode/SampleHairline.cpp',
'../samplecode/SampleHairModes.cpp',
+ '../samplecode/SampleIdentityScale.cpp',
'../samplecode/SampleLayerMask.cpp',
'../samplecode/SampleLayers.cpp',
'../samplecode/SampleLCD.cpp',
diff --git a/samplecode/SampleIdentityScale.cpp b/samplecode/SampleIdentityScale.cpp
new file mode 100644
index 0000000..a6b5c5c
--- /dev/null
+++ b/samplecode/SampleIdentityScale.cpp
@@ -0,0 +1,92 @@
+/*
+ * 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 "Resources.h"
+#include "SampleCode.h"
+#include "SkBlurMaskFilter.h"
+#include "SkCanvas.h"
+#include "SkColorPriv.h"
+#include "SkImageDecoder.h"
+#include "SkRandom.h"
+#include "SkStream.h"
+#include "SkTime.h"
+
+// Intended to exercise pixel snapping observed with scaled images (and
+// with non-scaled images, but for a different reason): Bug 1145
+
+class IdentityScaleView : public SampleView {
+public:
+ IdentityScaleView(const char imageFilename[]) {
+ SkString resourcePath = GetResourcePath(imageFilename);
+ SkImageDecoder* codec = NULL;
+ SkFILEStream stream(resourcePath.c_str());
+ if (stream.isValid()) {
+ codec = SkImageDecoder::Factory(&stream);
+ }
+ if (codec) {
+ stream.rewind();
+ codec->decode(&stream, &fBM, kN32_SkColorType, SkImageDecoder::kDecodePixels_Mode);
+ SkDELETE(codec);
+ } else {
+ fBM.allocN32Pixels(1, 1);
+ *(fBM.getAddr32(0,0)) = 0xFF0000FF; // red == bad
+ }
+ }
+
+protected:
+ SkBitmap fBM;
+
+ // overrides from SkEventSink
+ virtual bool onQuery(SkEvent* evt) SK_OVERRIDE {
+ if (SampleCode::TitleQ(*evt)) {
+ SampleCode::TitleR(evt, "IdentityScale");
+ return true;
+ }
+ return this->INHERITED::onQuery(evt);
+ }
+
+ virtual void onDrawContent(SkCanvas* canvas) SK_OVERRIDE {
+
+ SkPaint paint;
+
+ paint.setAntiAlias(true);
+ paint.setTextSize(48);
+ paint.setFilterLevel(SkPaint::kHigh_FilterLevel);
+
+ SkTime::DateTime time;
+ SkTime::GetDateTime(&time);
+
+ bool use_scale = (time.fSecond % 2 == 1);
+ const char *text;
+
+ canvas->save();
+ if (use_scale) {
+ text = "Scaled = 1";
+ } else {
+
+ SkRect r = { 100, 100, 356, 356 };
+ SkPath clipPath;
+ clipPath.addRoundRect(r, SkIntToScalar(5), SkIntToScalar(5));
+ canvas->clipPath(clipPath, SkRegion::kIntersect_Op, SkToBool(1));
+ text = "Scaled = 0";
+ }
+ canvas->drawBitmap( fBM, 100, 100, &paint );
+ canvas->restore();
+ canvas->drawText( text, strlen(text), 100, 400, paint );
+ this->inval(NULL);
+ }
+
+private:
+ typedef SampleView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new IdentityScaleView("mandrill_256.png"); }
+static SkViewRegister reg(MyFactory);