skia/ext/pixel_ref_utils_unittest.cc - chromium/src - Git at Google

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include <stdint.h>

 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/test/geometry_test_utils.h"
 #include "skia/ext/pixel_ref_utils.h"
 #include "skia/ext/refptr.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkImageGenerator.h"
 #include "third_party/skia/include/core/SkPictureRecorder.h"
 #include "third_party/skia/include/core/SkPixelRef.h"
 #include "third_party/skia/include/core/SkPoint.h"
 #include "third_party/skia/include/core/SkShader.h"
 #include "third_party/skia/src/core/SkOrderedReadBuffer.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/skia_util.h"

 namespace skia {

 namespace {

 class TestImageGenerator : public SkImageGenerator {
   public:
    TestImageGenerator(const SkImageInfo& info)
      : SkImageGenerator(info) { }
 };

 skia::RefPtr<SkImage> CreateDiscardableImage(const gfx::Size& size) {
   const SkImageInfo info =
       SkImageInfo::MakeN32Premul(size.width(), size.height());
   return skia::AdoptRef(
       SkImage::NewFromGenerator(new TestImageGenerator(info)));
 }

 void SetDiscardableShader(SkPaint* paint) {
   skia::RefPtr<SkImage> image = CreateDiscardableImage(gfx::Size(50, 50));
   skia::RefPtr<SkShader> shader = skia::AdoptRef(
       image->newShader(SkShader::kClamp_TileMode, SkShader::kClamp_TileMode));
   paint->setShader(shader.get());
 }

 SkCanvas* StartRecording(SkPictureRecorder* recorder, gfx::Rect layer_rect) {
   SkCanvas* canvas =
       recorder->beginRecording(layer_rect.width(), layer_rect.height());

   canvas->save();
   canvas->translate(-layer_rect.x(), -layer_rect.y());
   canvas->clipRect(SkRect::MakeXYWH(
       layer_rect.x(), layer_rect.y(), layer_rect.width(), layer_rect.height()));

   return canvas;
 }

 SkPicture* StopRecording(SkPictureRecorder* recorder, SkCanvas* canvas) {
   canvas->restore();
   return recorder->endRecordingAsPicture();
 }

 }  // namespace

 void VerifyScales(SkScalar x_scale,
                   SkScalar y_scale,
                   const SkMatrix& matrix,
                   int source_line) {
   SkSize scales;
   bool success = matrix.decomposeScale(&scales);
   EXPECT_TRUE(success) << "line: " << source_line;
   EXPECT_FLOAT_EQ(x_scale, scales.width()) << "line: " << source_line;
   EXPECT_FLOAT_EQ(y_scale, scales.height()) << "line: " << source_line;
 }

 TEST(PixelRefUtilsTest, DrawPaint) {
   gfx::Rect layer_rect(0, 0, 256, 256);

   SkPictureRecorder recorder;
   SkCanvas* canvas = StartRecording(&recorder, layer_rect);

   SkPaint first_paint;
   SetDiscardableShader(&first_paint);

   SkPaint second_paint;
   SetDiscardableShader(&second_paint);

   SkPaint third_paint;
   SetDiscardableShader(&third_paint);

   canvas->drawPaint(first_paint);
   canvas->clipRect(SkRect::MakeXYWH(34, 45, 56, 67));
   canvas->drawPaint(second_paint);

   canvas->save();
   canvas->scale(2.f, 3.f);
   canvas->drawPaint(second_paint);
   canvas->restore();

   // Total clip is now (34, 45, 56, 55)
   canvas->clipRect(SkRect::MakeWH(100, 100));
   canvas->drawPaint(third_paint);

   skia::RefPtr<SkPicture> picture =
       skia::AdoptRef(StopRecording(&recorder, canvas));

   std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
   skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

   EXPECT_EQ(4u, pixel_refs.size());
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(0, 0, 256, 256),
                        gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[0].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(34, 45, 56, 67),
                        gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[1].matrix, __LINE__);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(34, 45, 56, 67),
                        gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
   VerifyScales(2.f, 3.f, pixel_refs[2].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[2].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(34, 45, 56, 55),
                        gfx::SkRectToRectF(pixel_refs[3].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[3].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[3].filter_quality);
 }

 TEST(PixelRefUtilsTest, DrawPoints) {
   gfx::Rect layer_rect(0, 0, 256, 256);

   SkPictureRecorder recorder;
   SkCanvas* canvas = StartRecording(&recorder, layer_rect);

   SkPaint first_paint;
   SetDiscardableShader(&first_paint);

   SkPaint second_paint;
   SetDiscardableShader(&second_paint);

   SkPaint third_paint;
   SetDiscardableShader(&third_paint);

   SkPoint points[3];
   points[0].set(10, 10);
   points[1].set(100, 20);
   points[2].set(50, 100);
   // (10, 10, 90, 90).
   canvas->drawPoints(SkCanvas::kPolygon_PointMode, 3, points, first_paint);

   canvas->save();

   canvas->clipRect(SkRect::MakeWH(50, 50));
   // (10, 10, 90, 90).
   canvas->drawPoints(SkCanvas::kPolygon_PointMode, 3, points, second_paint);

   canvas->restore();

   points[0].set(50, 55);
   points[1].set(50, 55);
   points[2].set(200, 200);
   // (50, 55, 150, 145).
   canvas->drawPoints(SkCanvas::kPolygon_PointMode, 3, points, third_paint);

   skia::RefPtr<SkPicture> picture =
       skia::AdoptRef(StopRecording(&recorder, canvas));

   std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
   skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

   EXPECT_EQ(3u, pixel_refs.size());
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(10, 10, 90, 90),
                        gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[0].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(10, 10, 90, 90),
                        gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[1].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[1].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(50, 55, 150, 145),
                        gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[2].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[2].filter_quality);
 }

 TEST(PixelRefUtilsTest, DrawRect) {
   gfx::Rect layer_rect(0, 0, 256, 256);

   SkPictureRecorder recorder;
   SkCanvas* canvas = StartRecording(&recorder, layer_rect);

   SkPaint first_paint;
   SetDiscardableShader(&first_paint);

   SkPaint second_paint;
   SetDiscardableShader(&second_paint);

   SkPaint third_paint;
   SetDiscardableShader(&third_paint);

   // (10, 20, 30, 40).
   canvas->drawRect(SkRect::MakeXYWH(10, 20, 30, 40), first_paint);

   canvas->save();

   canvas->translate(5, 17);
   // (5, 50, 25, 35)
   canvas->drawRect(SkRect::MakeXYWH(0, 33, 25, 35), second_paint);

   canvas->restore();

   canvas->clipRect(SkRect::MakeXYWH(50, 50, 50, 50));
   canvas->translate(20, 20);
   // (20, 20, 100, 100)
   canvas->drawRect(SkRect::MakeXYWH(0, 0, 100, 100), third_paint);

   skia::RefPtr<SkPicture> picture =
       skia::AdoptRef(StopRecording(&recorder, canvas));

   std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
   skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

   EXPECT_EQ(3u, pixel_refs.size());
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(10, 20, 30, 40),
                        gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[0].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(5, 50, 25, 35),
                        gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[1].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[1].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(20, 20, 100, 100),
                        gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[2].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[2].filter_quality);
 }

 TEST(PixelRefUtilsTest, DrawRRect) {
   gfx::Rect layer_rect(0, 0, 256, 256);

   SkPictureRecorder recorder;
   SkCanvas* canvas = StartRecording(&recorder, layer_rect);

   SkPaint first_paint;
   SetDiscardableShader(&first_paint);

   SkPaint second_paint;
   SetDiscardableShader(&second_paint);

   SkPaint third_paint;
   SetDiscardableShader(&third_paint);

   SkRRect rrect;
   rrect.setRect(SkRect::MakeXYWH(10, 20, 30, 40));

   // (10, 20, 30, 40).
   canvas->drawRRect(rrect, first_paint);

   canvas->save();

   canvas->translate(5, 17);
   rrect.setRect(SkRect::MakeXYWH(0, 33, 25, 35));
   // (5, 50, 25, 35)
   canvas->drawRRect(rrect, second_paint);

   canvas->restore();

   canvas->clipRect(SkRect::MakeXYWH(50, 50, 50, 50));
   canvas->translate(20, 20);
   rrect.setRect(SkRect::MakeXYWH(0, 0, 100, 100));
   // (20, 20, 100, 100)
   canvas->drawRRect(rrect, third_paint);

   skia::RefPtr<SkPicture> picture =
       skia::AdoptRef(StopRecording(&recorder, canvas));

   std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
   skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

   EXPECT_EQ(3u, pixel_refs.size());
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(10, 20, 30, 40),
                        gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[0].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(5, 50, 25, 35),
                        gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[1].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[1].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(20, 20, 100, 100),
                        gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[2].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[2].filter_quality);
 }

 TEST(PixelRefUtilsTest, DrawOval) {
   gfx::Rect layer_rect(0, 0, 256, 256);

   SkPictureRecorder recorder;
   SkCanvas* canvas = StartRecording(&recorder, layer_rect);

   SkPaint first_paint;
   SetDiscardableShader(&first_paint);

   SkPaint second_paint;
   SetDiscardableShader(&second_paint);

   SkPaint third_paint;
   SetDiscardableShader(&third_paint);

   canvas->save();

   canvas->scale(2.f, 0.5f);
   // (20, 10, 60, 20).
   canvas->drawOval(SkRect::MakeXYWH(10, 20, 30, 40), first_paint);

   canvas->restore();
   canvas->save();

   canvas->translate(1, 2);
   // (1, 35, 25, 35)
   canvas->drawRect(SkRect::MakeXYWH(0, 33, 25, 35), second_paint);

   canvas->restore();

   canvas->clipRect(SkRect::MakeXYWH(50, 50, 50, 50));
   canvas->translate(20, 20);
   // (20, 20, 100, 100).
   canvas->drawRect(SkRect::MakeXYWH(0, 0, 100, 100), third_paint);

   skia::RefPtr<SkPicture> picture =
       skia::AdoptRef(StopRecording(&recorder, canvas));

   std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
   skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

   EXPECT_EQ(3u, pixel_refs.size());
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(20, 10, 60, 20),
                        gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
   VerifyScales(2.f, 0.5f, pixel_refs[0].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(1, 35, 25, 35),
                        gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[1].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[1].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(20, 20, 100, 100),
                        gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[2].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[2].filter_quality);
 }

 TEST(PixelRefUtilsTest, DrawPath) {
   gfx::Rect layer_rect(0, 0, 256, 256);

   SkPictureRecorder recorder;
   SkCanvas* canvas = StartRecording(&recorder, layer_rect);

   SkPaint first_paint;
   SetDiscardableShader(&first_paint);

   SkPaint second_paint;
   SetDiscardableShader(&second_paint);

   SkPath path;
   path.moveTo(12, 13);
   path.lineTo(50, 50);
   path.lineTo(22, 101);

   // (12, 13, 38, 88).
   canvas->drawPath(path, first_paint);

   canvas->save();
   canvas->clipRect(SkRect::MakeWH(50, 50));

   // (12, 13, 38, 88), since clips are ignored as long as the shape is in the
   // clip.
   canvas->drawPath(path, second_paint);

   canvas->restore();

   skia::RefPtr<SkPicture> picture =
       skia::AdoptRef(StopRecording(&recorder, canvas));

   std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
   skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

   EXPECT_EQ(2u, pixel_refs.size());
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(12, 13, 38, 88),
                        gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[0].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(12, 13, 38, 88),
                        gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[1].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[1].filter_quality);
 }

 TEST(PixelRefUtilsTest, DrawText) {
   gfx::Rect layer_rect(0, 0, 256, 256);

   SkPictureRecorder recorder;
   SkCanvas* canvas = StartRecording(&recorder, layer_rect);

   SkPaint first_paint;
   SetDiscardableShader(&first_paint);

   SkPoint points[4];
   points[0].set(10, 50);
   points[1].set(20, 50);
   points[2].set(30, 50);
   points[3].set(40, 50);

   SkPath path;
   path.moveTo(10, 50);
   path.lineTo(20, 50);
   path.lineTo(30, 50);
   path.lineTo(40, 50);
   path.lineTo(50, 50);

   canvas->drawText("text", 4, 50, 50, first_paint);
   canvas->drawPosText("text", 4, points, first_paint);
   canvas->drawTextOnPath("text", 4, path, NULL, first_paint);

   skia::RefPtr<SkPicture> picture =
       skia::AdoptRef(StopRecording(&recorder, canvas));

   std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
   skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

   EXPECT_EQ(3u, pixel_refs.size());
 }

 TEST(PixelRefUtilsTest, DrawVertices) {
   gfx::Rect layer_rect(0, 0, 256, 256);

   SkPictureRecorder recorder;
   SkCanvas* canvas = StartRecording(&recorder, layer_rect);

   SkPaint first_paint;
   SetDiscardableShader(&first_paint);

   SkPaint second_paint;
   SetDiscardableShader(&second_paint);

   SkPaint third_paint;
   SetDiscardableShader(&third_paint);

   SkPoint points[3];
   SkColor colors[3];
   uint16_t indecies[3] = {0, 1, 2};
   points[0].set(10, 10);
   points[1].set(100, 20);
   points[2].set(50, 100);
   // (10, 10, 90, 90).
   canvas->drawVertices(SkCanvas::kTriangles_VertexMode,
                        3,
                        points,
                        points,
                        colors,
                        NULL,
                        indecies,
                        3,
                        first_paint);

   canvas->save();

   canvas->clipRect(SkRect::MakeWH(50, 50));
   // (10, 10, 90, 90), since clips are ignored as long as the draw object is
   // within clip.
   canvas->drawVertices(SkCanvas::kTriangles_VertexMode,
                        3,
                        points,
                        points,
                        colors,
                        NULL,
                        indecies,
                        3,
                        second_paint);

   canvas->restore();

   points[0].set(50, 55);
   points[1].set(50, 55);
   points[2].set(200, 200);
   // (50, 55, 150, 145).
   canvas->drawVertices(SkCanvas::kTriangles_VertexMode,
                        3,
                        points,
                        points,
                        colors,
                        NULL,
                        indecies,
                        3,
                        third_paint);

   skia::RefPtr<SkPicture> picture =
       skia::AdoptRef(StopRecording(&recorder, canvas));

   std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
   skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

   EXPECT_EQ(3u, pixel_refs.size());
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(10, 10, 90, 90),
                        gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[0].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(10, 10, 90, 90),
                        gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[1].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[1].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(50, 55, 150, 145),
                        gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[2].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[2].filter_quality);
 }

 TEST(PixelRefUtilsTest, DrawImage) {
   gfx::Rect layer_rect(0, 0, 256, 256);

   SkPictureRecorder recorder;
   SkCanvas* canvas = StartRecording(&recorder, layer_rect);

   skia::RefPtr<SkImage> first = CreateDiscardableImage(gfx::Size(50, 50));
   skia::RefPtr<SkImage> second = CreateDiscardableImage(gfx::Size(50, 50));
   skia::RefPtr<SkImage> third = CreateDiscardableImage(gfx::Size(50, 50));
   skia::RefPtr<SkImage> fourth = CreateDiscardableImage(gfx::Size(50, 1));
   skia::RefPtr<SkImage> fifth = CreateDiscardableImage(gfx::Size(10, 10));
   skia::RefPtr<SkImage> sixth = CreateDiscardableImage(gfx::Size(10, 10));

   canvas->save();

   // At (0, 0).
   canvas->drawImage(first.get(), 0, 0);
   canvas->translate(25, 0);
   // At (25, 0).
   canvas->drawImage(second.get(), 0, 0);
   canvas->translate(0, 50);
   // At (50, 50).
   canvas->drawImage(third.get(), 25, 0);

   canvas->restore();
   canvas->save();

   canvas->translate(1, 0);
   canvas->rotate(90);
   // At (1, 0), rotated 90 degrees
   canvas->drawImage(fourth.get(), 0, 0);

   canvas->restore();
   canvas->save();

   canvas->scale(5.f, 6.f);
   // At (0, 0), scaled by 5 and 6
   canvas->drawImage(fifth.get(), 0, 0);

   canvas->restore();

   canvas->rotate(27);
   canvas->scale(3.3f, 0.4f);

   canvas->drawImage(sixth.get(), 0, 0);

   canvas->restore();

   skia::RefPtr<SkPicture> picture =
       skia::AdoptRef(StopRecording(&recorder, canvas));

   std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
   skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

   EXPECT_EQ(6u, pixel_refs.size());
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(0, 0, 50, 50),
                        gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[0].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(25, 0, 50, 50),
                        gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[1].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[1].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(50, 50, 50, 50),
                        gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[2].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[2].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(0, 0, 1, 50),
                        gfx::SkRectToRectF(pixel_refs[3].pixel_ref_rect));
   VerifyScales(1.f, 1.f, pixel_refs[3].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[3].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(0, 0, 50, 60),
                        gfx::SkRectToRectF(pixel_refs[4].pixel_ref_rect));
   VerifyScales(5.f, 6.f, pixel_refs[4].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[4].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(-1.8159621f, 0, 31.219175f, 18.545712f),
                        gfx::SkRectToRectF(pixel_refs[5].pixel_ref_rect));
   VerifyScales(3.3f, 0.4f, pixel_refs[5].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[5].filter_quality);
 }

 TEST(PixelRefUtilsTest, DrawImageRect) {
   gfx::Rect layer_rect(0, 0, 256, 256);

   SkPictureRecorder recorder;
   SkCanvas* canvas = StartRecording(&recorder, layer_rect);

   skia::RefPtr<SkImage> first = CreateDiscardableImage(gfx::Size(50, 50));
   skia::RefPtr<SkImage> second = CreateDiscardableImage(gfx::Size(50, 50));
   skia::RefPtr<SkImage> third = CreateDiscardableImage(gfx::Size(50, 50));

   SkPaint first_paint;
   SetDiscardableShader(&first_paint);

   SkPaint non_discardable_paint;

   canvas->save();

   // (0, 0, 100, 100).
   canvas->drawImageRect(
       first.get(), SkRect::MakeWH(100, 100), &non_discardable_paint);
   canvas->translate(25, 0);
   // (75, 50, 10, 10).
   canvas->drawImageRect(
       second.get(), SkRect::MakeXYWH(50, 50, 10, 10), &non_discardable_paint);
   canvas->translate(5, 50);
   // (0, 30, 100, 100). One from bitmap, one from paint.
   canvas->drawImageRect(
       third.get(), SkRect::MakeXYWH(-30, -20, 100, 100), &first_paint);

   canvas->restore();

   skia::RefPtr<SkPicture> picture =
       skia::AdoptRef(StopRecording(&recorder, canvas));

   std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
   skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

   EXPECT_EQ(4u, pixel_refs.size());
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(0, 0, 100, 100),
                        gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
   VerifyScales(2.f, 2.f, pixel_refs[0].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(75, 50, 10, 10),
                        gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
   VerifyScales(0.2f, 0.2f, pixel_refs[1].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[1].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(0, 30, 100, 100),
                        gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect));
   VerifyScales(2.f, 2.f, pixel_refs[2].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[2].filter_quality);
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(0, 30, 100, 100),
                        gfx::SkRectToRectF(pixel_refs[3].pixel_ref_rect));
   VerifyScales(2.f, 2.f, pixel_refs[3].matrix, __LINE__);
   EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[3].filter_quality);
 }

 }  // namespace skia
	// Copyright 2014 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include <stdint.h>

	#include "base/compiler_specific.h"
	#include "base/memory/scoped_ptr.h"
	#include "cc/test/geometry_test_utils.h"
	#include "skia/ext/pixel_ref_utils.h"
	#include "skia/ext/refptr.h"
	#include "testing/gtest/include/gtest/gtest.h"
	#include "third_party/skia/include/core/SkBitmap.h"
	#include "third_party/skia/include/core/SkCanvas.h"
	#include "third_party/skia/include/core/SkImage.h"
	#include "third_party/skia/include/core/SkImageGenerator.h"
	#include "third_party/skia/include/core/SkPictureRecorder.h"
	#include "third_party/skia/include/core/SkPixelRef.h"
	#include "third_party/skia/include/core/SkPoint.h"
	#include "third_party/skia/include/core/SkShader.h"
	#include "third_party/skia/src/core/SkOrderedReadBuffer.h"
	#include "ui/gfx/geometry/rect.h"
	#include "ui/gfx/skia_util.h"

	namespace skia {

	namespace {

	class TestImageGenerator : public SkImageGenerator {
	public:
	TestImageGenerator(const SkImageInfo& info)
	: SkImageGenerator(info) { }
	};

	skia::RefPtr<SkImage> CreateDiscardableImage(const gfx::Size& size) {
	const SkImageInfo info =
	SkImageInfo::MakeN32Premul(size.width(), size.height());
	return skia::AdoptRef(
	SkImage::NewFromGenerator(new TestImageGenerator(info)));
	}

	void SetDiscardableShader(SkPaint* paint) {
	skia::RefPtr<SkImage> image = CreateDiscardableImage(gfx::Size(50, 50));
	skia::RefPtr<SkShader> shader = skia::AdoptRef(
	image->newShader(SkShader::kClamp_TileMode, SkShader::kClamp_TileMode));
	paint->setShader(shader.get());
	}

	SkCanvas* StartRecording(SkPictureRecorder* recorder, gfx::Rect layer_rect) {
	SkCanvas* canvas =
	recorder->beginRecording(layer_rect.width(), layer_rect.height());

	canvas->save();
	canvas->translate(-layer_rect.x(), -layer_rect.y());
	canvas->clipRect(SkRect::MakeXYWH(
	layer_rect.x(), layer_rect.y(), layer_rect.width(), layer_rect.height()));

	return canvas;
	}

	SkPicture* StopRecording(SkPictureRecorder* recorder, SkCanvas* canvas) {
	canvas->restore();
	return recorder->endRecordingAsPicture();
	}

	} // namespace

	void VerifyScales(SkScalar x_scale,
	SkScalar y_scale,
	const SkMatrix& matrix,
	int source_line) {
	SkSize scales;
	bool success = matrix.decomposeScale(&scales);
	EXPECT_TRUE(success) << "line: " << source_line;
	EXPECT_FLOAT_EQ(x_scale, scales.width()) << "line: " << source_line;
	EXPECT_FLOAT_EQ(y_scale, scales.height()) << "line: " << source_line;
	}

	TEST(PixelRefUtilsTest, DrawPaint) {
	gfx::Rect layer_rect(0, 0, 256, 256);

	SkPictureRecorder recorder;
	SkCanvas* canvas = StartRecording(&recorder, layer_rect);

	SkPaint first_paint;
	SetDiscardableShader(&first_paint);

	SkPaint second_paint;
	SetDiscardableShader(&second_paint);

	SkPaint third_paint;
	SetDiscardableShader(&third_paint);

	canvas->drawPaint(first_paint);
	canvas->clipRect(SkRect::MakeXYWH(34, 45, 56, 67));
	canvas->drawPaint(second_paint);

	canvas->save();
	canvas->scale(2.f, 3.f);
	canvas->drawPaint(second_paint);
	canvas->restore();

	// Total clip is now (34, 45, 56, 55)
	canvas->clipRect(SkRect::MakeWH(100, 100));
	canvas->drawPaint(third_paint);

	skia::RefPtr<SkPicture> picture =
	skia::AdoptRef(StopRecording(&recorder, canvas));

	std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
	skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

	EXPECT_EQ(4u, pixel_refs.size());
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(0, 0, 256, 256),
	gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[0].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(34, 45, 56, 67),
	gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[1].matrix, __LINE__);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(34, 45, 56, 67),
	gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
	VerifyScales(2.f, 3.f, pixel_refs[2].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[2].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(34, 45, 56, 55),
	gfx::SkRectToRectF(pixel_refs[3].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[3].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[3].filter_quality);
	}

	TEST(PixelRefUtilsTest, DrawPoints) {
	gfx::Rect layer_rect(0, 0, 256, 256);

	SkPictureRecorder recorder;
	SkCanvas* canvas = StartRecording(&recorder, layer_rect);

	SkPaint first_paint;
	SetDiscardableShader(&first_paint);

	SkPaint second_paint;
	SetDiscardableShader(&second_paint);

	SkPaint third_paint;
	SetDiscardableShader(&third_paint);

	SkPoint points[3];
	points[0].set(10, 10);
	points[1].set(100, 20);
	points[2].set(50, 100);
	// (10, 10, 90, 90).
	canvas->drawPoints(SkCanvas::kPolygon_PointMode, 3, points, first_paint);

	canvas->save();

	canvas->clipRect(SkRect::MakeWH(50, 50));
	// (10, 10, 90, 90).
	canvas->drawPoints(SkCanvas::kPolygon_PointMode, 3, points, second_paint);

	canvas->restore();

	points[0].set(50, 55);
	points[1].set(50, 55);
	points[2].set(200, 200);
	// (50, 55, 150, 145).
	canvas->drawPoints(SkCanvas::kPolygon_PointMode, 3, points, third_paint);

	skia::RefPtr<SkPicture> picture =
	skia::AdoptRef(StopRecording(&recorder, canvas));

	std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
	skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

	EXPECT_EQ(3u, pixel_refs.size());
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(10, 10, 90, 90),
	gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[0].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(10, 10, 90, 90),
	gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[1].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[1].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(50, 55, 150, 145),
	gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[2].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[2].filter_quality);
	}

	TEST(PixelRefUtilsTest, DrawRect) {
	gfx::Rect layer_rect(0, 0, 256, 256);

	SkPictureRecorder recorder;
	SkCanvas* canvas = StartRecording(&recorder, layer_rect);

	SkPaint first_paint;
	SetDiscardableShader(&first_paint);

	SkPaint second_paint;
	SetDiscardableShader(&second_paint);

	SkPaint third_paint;
	SetDiscardableShader(&third_paint);

	// (10, 20, 30, 40).
	canvas->drawRect(SkRect::MakeXYWH(10, 20, 30, 40), first_paint);

	canvas->save();

	canvas->translate(5, 17);
	// (5, 50, 25, 35)
	canvas->drawRect(SkRect::MakeXYWH(0, 33, 25, 35), second_paint);

	canvas->restore();

	canvas->clipRect(SkRect::MakeXYWH(50, 50, 50, 50));
	canvas->translate(20, 20);
	// (20, 20, 100, 100)
	canvas->drawRect(SkRect::MakeXYWH(0, 0, 100, 100), third_paint);

	skia::RefPtr<SkPicture> picture =
	skia::AdoptRef(StopRecording(&recorder, canvas));

	std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
	skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

	EXPECT_EQ(3u, pixel_refs.size());
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(10, 20, 30, 40),
	gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[0].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(5, 50, 25, 35),
	gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[1].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[1].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(20, 20, 100, 100),
	gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[2].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[2].filter_quality);
	}

	TEST(PixelRefUtilsTest, DrawRRect) {
	gfx::Rect layer_rect(0, 0, 256, 256);

	SkPictureRecorder recorder;
	SkCanvas* canvas = StartRecording(&recorder, layer_rect);

	SkPaint first_paint;
	SetDiscardableShader(&first_paint);

	SkPaint second_paint;
	SetDiscardableShader(&second_paint);

	SkPaint third_paint;
	SetDiscardableShader(&third_paint);

	SkRRect rrect;
	rrect.setRect(SkRect::MakeXYWH(10, 20, 30, 40));

	// (10, 20, 30, 40).
	canvas->drawRRect(rrect, first_paint);

	canvas->save();

	canvas->translate(5, 17);
	rrect.setRect(SkRect::MakeXYWH(0, 33, 25, 35));
	// (5, 50, 25, 35)
	canvas->drawRRect(rrect, second_paint);

	canvas->restore();

	canvas->clipRect(SkRect::MakeXYWH(50, 50, 50, 50));
	canvas->translate(20, 20);
	rrect.setRect(SkRect::MakeXYWH(0, 0, 100, 100));
	// (20, 20, 100, 100)
	canvas->drawRRect(rrect, third_paint);

	skia::RefPtr<SkPicture> picture =
	skia::AdoptRef(StopRecording(&recorder, canvas));

	std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
	skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

	EXPECT_EQ(3u, pixel_refs.size());
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(10, 20, 30, 40),
	gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[0].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(5, 50, 25, 35),
	gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[1].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[1].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(20, 20, 100, 100),
	gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[2].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[2].filter_quality);
	}

	TEST(PixelRefUtilsTest, DrawOval) {
	gfx::Rect layer_rect(0, 0, 256, 256);

	SkPictureRecorder recorder;
	SkCanvas* canvas = StartRecording(&recorder, layer_rect);

	SkPaint first_paint;
	SetDiscardableShader(&first_paint);

	SkPaint second_paint;
	SetDiscardableShader(&second_paint);

	SkPaint third_paint;
	SetDiscardableShader(&third_paint);

	canvas->save();

	canvas->scale(2.f, 0.5f);
	// (20, 10, 60, 20).
	canvas->drawOval(SkRect::MakeXYWH(10, 20, 30, 40), first_paint);

	canvas->restore();
	canvas->save();

	canvas->translate(1, 2);
	// (1, 35, 25, 35)
	canvas->drawRect(SkRect::MakeXYWH(0, 33, 25, 35), second_paint);

	canvas->restore();

	canvas->clipRect(SkRect::MakeXYWH(50, 50, 50, 50));
	canvas->translate(20, 20);
	// (20, 20, 100, 100).
	canvas->drawRect(SkRect::MakeXYWH(0, 0, 100, 100), third_paint);

	skia::RefPtr<SkPicture> picture =
	skia::AdoptRef(StopRecording(&recorder, canvas));

	std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
	skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

	EXPECT_EQ(3u, pixel_refs.size());
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(20, 10, 60, 20),
	gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
	VerifyScales(2.f, 0.5f, pixel_refs[0].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(1, 35, 25, 35),
	gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[1].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[1].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(20, 20, 100, 100),
	gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[2].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[2].filter_quality);
	}

	TEST(PixelRefUtilsTest, DrawPath) {
	gfx::Rect layer_rect(0, 0, 256, 256);

	SkPictureRecorder recorder;
	SkCanvas* canvas = StartRecording(&recorder, layer_rect);

	SkPaint first_paint;
	SetDiscardableShader(&first_paint);

	SkPaint second_paint;
	SetDiscardableShader(&second_paint);

	SkPath path;
	path.moveTo(12, 13);
	path.lineTo(50, 50);
	path.lineTo(22, 101);

	// (12, 13, 38, 88).
	canvas->drawPath(path, first_paint);

	canvas->save();
	canvas->clipRect(SkRect::MakeWH(50, 50));

	// (12, 13, 38, 88), since clips are ignored as long as the shape is in the
	// clip.
	canvas->drawPath(path, second_paint);

	canvas->restore();

	skia::RefPtr<SkPicture> picture =
	skia::AdoptRef(StopRecording(&recorder, canvas));

	std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
	skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

	EXPECT_EQ(2u, pixel_refs.size());
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(12, 13, 38, 88),
	gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[0].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(12, 13, 38, 88),
	gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[1].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[1].filter_quality);
	}

	TEST(PixelRefUtilsTest, DrawText) {
	gfx::Rect layer_rect(0, 0, 256, 256);

	SkPictureRecorder recorder;
	SkCanvas* canvas = StartRecording(&recorder, layer_rect);

	SkPaint first_paint;
	SetDiscardableShader(&first_paint);

	SkPoint points[4];
	points[0].set(10, 50);
	points[1].set(20, 50);
	points[2].set(30, 50);
	points[3].set(40, 50);

	SkPath path;
	path.moveTo(10, 50);
	path.lineTo(20, 50);
	path.lineTo(30, 50);
	path.lineTo(40, 50);
	path.lineTo(50, 50);

	canvas->drawText("text", 4, 50, 50, first_paint);
	canvas->drawPosText("text", 4, points, first_paint);
	canvas->drawTextOnPath("text", 4, path, NULL, first_paint);

	skia::RefPtr<SkPicture> picture =
	skia::AdoptRef(StopRecording(&recorder, canvas));

	std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
	skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

	EXPECT_EQ(3u, pixel_refs.size());
	}

	TEST(PixelRefUtilsTest, DrawVertices) {
	gfx::Rect layer_rect(0, 0, 256, 256);

	SkPictureRecorder recorder;
	SkCanvas* canvas = StartRecording(&recorder, layer_rect);

	SkPaint first_paint;
	SetDiscardableShader(&first_paint);

	SkPaint second_paint;
	SetDiscardableShader(&second_paint);

	SkPaint third_paint;
	SetDiscardableShader(&third_paint);

	SkPoint points[3];
	SkColor colors[3];
	uint16_t indecies[3] = {0, 1, 2};
	points[0].set(10, 10);
	points[1].set(100, 20);
	points[2].set(50, 100);
	// (10, 10, 90, 90).
	canvas->drawVertices(SkCanvas::kTriangles_VertexMode,
	3,
	points,
	points,
	colors,
	NULL,
	indecies,
	3,
	first_paint);

	canvas->save();

	canvas->clipRect(SkRect::MakeWH(50, 50));
	// (10, 10, 90, 90), since clips are ignored as long as the draw object is
	// within clip.
	canvas->drawVertices(SkCanvas::kTriangles_VertexMode,
	3,
	points,
	points,
	colors,
	NULL,
	indecies,
	3,
	second_paint);

	canvas->restore();

	points[0].set(50, 55);
	points[1].set(50, 55);
	points[2].set(200, 200);
	// (50, 55, 150, 145).
	canvas->drawVertices(SkCanvas::kTriangles_VertexMode,
	3,
	points,
	points,
	colors,
	NULL,
	indecies,
	3,
	third_paint);

	skia::RefPtr<SkPicture> picture =
	skia::AdoptRef(StopRecording(&recorder, canvas));

	std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
	skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

	EXPECT_EQ(3u, pixel_refs.size());
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(10, 10, 90, 90),
	gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[0].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(10, 10, 90, 90),
	gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[1].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[1].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(50, 55, 150, 145),
	gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[2].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[2].filter_quality);
	}

	TEST(PixelRefUtilsTest, DrawImage) {
	gfx::Rect layer_rect(0, 0, 256, 256);

	SkPictureRecorder recorder;
	SkCanvas* canvas = StartRecording(&recorder, layer_rect);

	skia::RefPtr<SkImage> first = CreateDiscardableImage(gfx::Size(50, 50));
	skia::RefPtr<SkImage> second = CreateDiscardableImage(gfx::Size(50, 50));
	skia::RefPtr<SkImage> third = CreateDiscardableImage(gfx::Size(50, 50));
	skia::RefPtr<SkImage> fourth = CreateDiscardableImage(gfx::Size(50, 1));
	skia::RefPtr<SkImage> fifth = CreateDiscardableImage(gfx::Size(10, 10));
	skia::RefPtr<SkImage> sixth = CreateDiscardableImage(gfx::Size(10, 10));

	canvas->save();

	// At (0, 0).
	canvas->drawImage(first.get(), 0, 0);
	canvas->translate(25, 0);
	// At (25, 0).
	canvas->drawImage(second.get(), 0, 0);
	canvas->translate(0, 50);
	// At (50, 50).
	canvas->drawImage(third.get(), 25, 0);

	canvas->restore();
	canvas->save();

	canvas->translate(1, 0);
	canvas->rotate(90);
	// At (1, 0), rotated 90 degrees
	canvas->drawImage(fourth.get(), 0, 0);

	canvas->restore();
	canvas->save();

	canvas->scale(5.f, 6.f);
	// At (0, 0), scaled by 5 and 6
	canvas->drawImage(fifth.get(), 0, 0);

	canvas->restore();

	canvas->rotate(27);
	canvas->scale(3.3f, 0.4f);

	canvas->drawImage(sixth.get(), 0, 0);

	canvas->restore();

	skia::RefPtr<SkPicture> picture =
	skia::AdoptRef(StopRecording(&recorder, canvas));

	std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
	skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

	EXPECT_EQ(6u, pixel_refs.size());
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(0, 0, 50, 50),
	gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[0].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(25, 0, 50, 50),
	gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[1].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[1].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(50, 50, 50, 50),
	gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[2].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[2].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(0, 0, 1, 50),
	gfx::SkRectToRectF(pixel_refs[3].pixel_ref_rect));
	VerifyScales(1.f, 1.f, pixel_refs[3].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[3].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(0, 0, 50, 60),
	gfx::SkRectToRectF(pixel_refs[4].pixel_ref_rect));
	VerifyScales(5.f, 6.f, pixel_refs[4].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[4].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(-1.8159621f, 0, 31.219175f, 18.545712f),
	gfx::SkRectToRectF(pixel_refs[5].pixel_ref_rect));
	VerifyScales(3.3f, 0.4f, pixel_refs[5].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[5].filter_quality);
	}

	TEST(PixelRefUtilsTest, DrawImageRect) {
	gfx::Rect layer_rect(0, 0, 256, 256);

	SkPictureRecorder recorder;
	SkCanvas* canvas = StartRecording(&recorder, layer_rect);

	skia::RefPtr<SkImage> first = CreateDiscardableImage(gfx::Size(50, 50));
	skia::RefPtr<SkImage> second = CreateDiscardableImage(gfx::Size(50, 50));
	skia::RefPtr<SkImage> third = CreateDiscardableImage(gfx::Size(50, 50));

	SkPaint first_paint;
	SetDiscardableShader(&first_paint);

	SkPaint non_discardable_paint;

	canvas->save();

	// (0, 0, 100, 100).
	canvas->drawImageRect(
	first.get(), SkRect::MakeWH(100, 100), &non_discardable_paint);
	canvas->translate(25, 0);
	// (75, 50, 10, 10).
	canvas->drawImageRect(
	second.get(), SkRect::MakeXYWH(50, 50, 10, 10), &non_discardable_paint);
	canvas->translate(5, 50);
	// (0, 30, 100, 100). One from bitmap, one from paint.
	canvas->drawImageRect(
	third.get(), SkRect::MakeXYWH(-30, -20, 100, 100), &first_paint);

	canvas->restore();

	skia::RefPtr<SkPicture> picture =
	skia::AdoptRef(StopRecording(&recorder, canvas));

	std::vector<skia::PixelRefUtils::PositionPixelRef> pixel_refs;
	skia::PixelRefUtils::GatherDiscardablePixelRefs(picture.get(), &pixel_refs);

	EXPECT_EQ(4u, pixel_refs.size());
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(0, 0, 100, 100),
	gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect));
	VerifyScales(2.f, 2.f, pixel_refs[0].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[0].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(75, 50, 10, 10),
	gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect));
	VerifyScales(0.2f, 0.2f, pixel_refs[1].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[1].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(0, 30, 100, 100),
	gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect));
	VerifyScales(2.f, 2.f, pixel_refs[2].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[2].filter_quality);
	EXPECT_FLOAT_RECT_EQ(gfx::RectF(0, 30, 100, 100),
	gfx::SkRectToRectF(pixel_refs[3].pixel_ref_rect));
	VerifyScales(2.f, 2.f, pixel_refs[3].matrix, __LINE__);
	EXPECT_EQ(kNone_SkFilterQuality, pixel_refs[3].filter_quality);
	}

	} // namespace skia