HUD: Show first paint invalidation in red

cc/blink/blink_layer_debug_info.cc

Index: cc/blink/blink_layer_debug_info.cc
diff --git a/cc/blink/blink_layer_debug_info.cc b/cc/blink/blink_layer_debug_info.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fc0811f06acc6804832ef98754fa3b0b32181d68
--- /dev/null
+++ b/cc/blink/blink_layer_debug_info.cc
@@ -0,0 +1,73 @@
+// 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 "cc/blink/blink_layer_debug_info.h"
+
+#include "cc/base/math_util.h"
+#include "cc/debug/debug_rect_history.h"
+#include "cc/layers/layer.h"
+#include "third_party/WebKit/public/platform/WebGraphicsLayerDebugInfo.h"
+#include "third_party/WebKit/public/platform/WebInvalidationDebugAnnotations.h"
+#include "third_party/WebKit/public/platform/WebVector.h"
+#include "ui/gfx/geometry/rect_conversions.h"
+
+namespace cc_blink {
+
+BlinkLayerDebugInfo::BlinkLayerDebugInfo(
+    blink::WebGraphicsLayerDebugInfo* debug_info)
+    : debug_info_(debug_info) {
+}
+
+BlinkLayerDebugInfo::~BlinkLayerDebugInfo() {
+}
+
+void BlinkLayerDebugInfo::AppendAsTraceFormat(std::string* out) const {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  blink::WebString web_string;
+  debug_info_->appendAsTraceFormat(&web_string);
+  out->append(web_string.utf8());
+}
+
+namespace {
+
+cc::DebugRectType WebInvalidationDebugAnnotationsToDebugRectType(
+    blink::WebInvalidationDebugAnnotations annotations) {
+  if (annotations == blink::WebInvalidationDebugAnnotationsFirstPaint) {
+    return cc::FIRST_PAINT_RECT_TYPE;
+  }
+
+  return cc::PAINT_RECT_TYPE;
+}
+
+}  // namespace
+
+std::vector<cc::DebugRect> BlinkLayerDebugInfo::GetInvalidationRects(
+    cc::Layer* layer) const {
+  std::vector<cc::DebugRect> rects;
+
+  blink::WebVector<blink::WebAnnotatedInvalidationRect> web_rects;
+  debug_info_->getAnnotatedInvalidationRects(web_rects);
+
+  float width_scale = layer->content_bounds().width() /
+                      static_cast<float>(layer->bounds().width());
+  float height_scale = layer->content_bounds().height() /
+                       static_cast<float>(layer->bounds().height());
+
+  rects.reserve(web_rects.size());
+  for (size_t i = 0; i < web_rects.size(); ++i) {
+    const blink::WebAnnotatedInvalidationRect& web_rect = web_rects[i];
+    cc::DebugRectType type =
+        WebInvalidationDebugAnnotationsToDebugRectType(web_rect.annotations);
+
+    gfx::Rect update_content_rect = gfx::ScaleToEnclosingRect(
+        gfx::ToEnclosingRect(web_rect.rect), width_scale, height_scale);
+    gfx::Rect screen_space_rect = cc::MathUtil::MapEnclosingClippedRect(
+        layer->screen_space_transform(), update_content_rect);
+    rects.push_back(cc::DebugRect(type, screen_space_rect));
+  }
+
+  return rects;
+}
+
+}  // namespace cc_blink