Implement merging non-composited paint property nodes in the PACompositor.

third_party/WebKit/Source/platform/testing/PictureMatchers.cpp

 // Copyright 2016 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 "platform/testing/PictureMatchers.h"
 
 #include "platform/geometry/FloatQuad.h"
 #include "platform/geometry/FloatRect.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkPicture.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 #include <utility>
 
 namespace blink {
 
 namespace {
 
+struct QuadWithColor {
+  FloatQuad quad;
+  Color color;
+};
+
 class DrawsRectangleCanvas : public SkCanvas {
  public:
-  DrawsRectangleCanvas() : SkCanvas(800, 600) {}
-  const Vector<std::pair<FloatQuad, Color>>& quads() const { return m_quads; }
+  DrawsRectangleCanvas()
+      : SkCanvas(800, 600),
+        m_saveCount(0),
+        m_alpha(255),
+        m_alphaSaveLayerCount(-1) {}
+  const Vector<QuadWithColor>& quadsWithColor() const { return m_quads; }
+
   void onDrawRect(const SkRect& rect, const SkPaint& paint) override {
+    SkRect clippedRect(rect);
+    for (Vector<ClipAndIndex>::const_reverse_iterator clip = m_clips.rbegin();
+         clip != m_clips.rend(); clip++) {
+      if (SkRect::Intersects(rect, clip->rect))
+        CHECK(clippedRect.intersect(clip->rect));
+    }
     SkPoint quad[4];
-    getTotalMatrix().mapRectToQuad(quad, rect);
-    FloatQuad floatQuad(quad);
-    m_quads.append(std::make_pair(floatQuad, Color(paint.getColor())));
-    SkCanvas::onDrawRect(rect, paint);
+    getTotalMatrix().mapRectToQuad(quad, clippedRect);
+    QuadWithColor quadWithColor;
+    quadWithColor.quad = FloatQuad(quad);
+
+    unsigned paintAlpha = static_cast<unsigned>(paint.getAlpha());
+    SkPaint paintWithAlpha(paint);
+    paintWithAlpha.setAlpha(static_cast<U8CPU>(m_alpha * paintAlpha / 255));
+    quadWithColor.color = Color(paintWithAlpha.getColor());
+    m_quads.append(quadWithColor);
+    SkCanvas::onDrawRect(clippedRect, paint);
   }
 
+  SkCanvas::SaveLayerStrategy getSaveLayerStrategy(
+      const SaveLayerRec& rec) override {
+    m_saveCount++;
+    unsigned layerAlpha = static_cast<unsigned>(rec.fPaint->getAlpha());
+    if (layerAlpha < 255) {
+      DCHECK_EQ(m_alphaSaveLayerCount, -1);
+      m_alphaSaveLayerCount = m_saveCount;
+      m_alpha = layerAlpha;
+    }
+    return SkCanvas::getSaveLayerStrategy(rec);
+  }
+
+  void willSave() override {
+    m_saveCount++;
+    SkCanvas::willSave();
+  }
+
+  void willRestore() override {
+    DCHECK_GT(m_saveCount, 0);
+    if (m_clips.size() && m_saveCount == m_clips.back().saveCount)
+      m_clips.pop_back();
+    if (m_alphaSaveLayerCount == m_saveCount) {
+      m_alpha = 255;
+      m_alphaSaveLayerCount = -1;
+    }
+    m_saveCount--;
+    SkCanvas::willRestore();
+  }
+
+  void onClipRect(const SkRect& rect,
+                  SkClipOp op,
+                  ClipEdgeStyle style) override {
+    ClipAndIndex clipStruct;
+    clipStruct.rect = rect;
+    clipStruct.saveCount = m_saveCount;
+    m_clips.push_back(clipStruct);
+    SkCanvas::onClipRect(rect, op, style);
+  }
+
+  struct ClipAndIndex {
+    SkRect rect;
+    int saveCount;
+  };
+
  private:
-  Vector<std::pair<FloatQuad, Color>> m_quads;
+  Vector<QuadWithColor> m_quads;
+  Vector<ClipAndIndex> m_clips;
+  int m_saveCount;
+  unsigned m_alpha;
+  int m_alphaSaveLayerCount;
 };
 
-class DrawsRectangleMatcher
+class DrawsRectanglesMatcher
     : public ::testing::MatcherInterface<const SkPicture&> {
  public:
-  DrawsRectangleMatcher(const FloatRect& rect, Color color)
-      : m_rect(rect), m_color(color) {}
+  DrawsRectanglesMatcher(const Vector<RectWithColor>& rectsWithColor)
+      : m_rectsWithColor(rectsWithColor) {}
 
   bool MatchAndExplain(
       const SkPicture& picture,
       ::testing::MatchResultListener* listener) const override {
     DrawsRectangleCanvas canvas;
     picture.playback(&canvas);
-    const auto& quads = canvas.quads();
-
-    if (quads.size() != 1) {
+    const auto& quads = canvas.quadsWithColor();
+    if (quads.size() != m_rectsWithColor.size()) {
       *listener << "which draws " << quads.size() << " quads";
       return false;
     }
 
-    const FloatQuad& quad = quads[0].first;
-    if (!quad.isRectilinear()) {
-      if (listener->IsInterested()) {
-        *listener << "which draws ";
-        PrintTo(quad, listener->stream());
-        *listener << " with color "
-                  << quads[0].second.serialized().ascii().data();
+    for (unsigned index = 0; index < quads.size(); index++) {
+      const auto& quadWithColor = quads[index];
+      const auto& rectWithColor = m_rectsWithColor[index];
+      if (!quadWithColor.quad.isRectilinear()) {
+        if (listener->IsInterested()) {
+          *listener << "at index " << index << " which draws ";
+          PrintTo(quadWithColor.quad, listener->stream());
+          *listener << " with color "
+                    << quadWithColor.color.serialized().ascii().data() << "\n";
+        }
+        return false;
       }
-      return false;
-    }
 
-    const FloatRect& rect = quad.boundingBox();
-    if (rect != m_rect || quads[0].second != m_color) {
-      if (listener->IsInterested()) {
-        *listener << "which draws ";
-        PrintTo(rect, listener->stream());
-        *listener << " with color "
-                  << quads[0].second.serialized().ascii().data();
+      const FloatRect& rect = quadWithColor.quad.boundingBox();
+      if (rect != rectWithColor.rect ||
+          quadWithColor.color != rectWithColor.color) {
+        if (listener->IsInterested()) {
+          *listener << "at index " << index << " which draws ";
+          PrintTo(rect, listener->stream());
+          *listener << " with color "
+                    << quadWithColor.color.serialized().ascii().data() << "\n";
+        }
+        return false;
       }
-      return false;
     }
 
     return true;
   }
 
   void DescribeTo(::std::ostream* os) const override {
-    *os << "draws ";
-    PrintTo(m_rect, os);
-    *os << " with color " << m_color.serialized().ascii().data();
+    *os << "\n";
+    for (unsigned index = 0; index < m_rectsWithColor.size(); index++) {
+      const auto& rectWithColor = m_rectsWithColor[index];
+      *os << "at index " << index << " rect draws ";
+      PrintTo(rectWithColor.rect, os);
+      *os << " with color " << rectWithColor.color.serialized().ascii().data()
+          << "\n";
+    }
   }
 
  private:
-  const FloatRect m_rect;
-  const Color m_color;
+  const Vector<RectWithColor> m_rectsWithColor;
 };
 
 }  // namespace
 
 ::testing::Matcher<const SkPicture&> drawsRectangle(const FloatRect& rect,
                                                     Color color) {
-  return ::testing::MakeMatcher(new DrawsRectangleMatcher(rect, color));
+  Vector<RectWithColor> rectsWithColor;
+  rectsWithColor.push_back(RectWithColor(rect, color));
+  return ::testing::MakeMatcher(new DrawsRectanglesMatcher(rectsWithColor));
+}
+
+::testing::Matcher<const SkPicture&> drawsRectangles(
+    const Vector<RectWithColor>& rectsWithColor) {
+  return ::testing::MakeMatcher(new DrawsRectanglesMatcher(rectsWithColor));
 }
 
 }  // namespace blink