Debugging code to print layer tree

ui/gfx/compositor/debug_utils.cc

+// Copyright (c) 2011 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.
+
+#ifndef NDEBUG
+
+#include "ui/gfx/compositor/debug_utils.h"
+
+#include <iomanip>
+#include <iostream>
+#include <string>
+
+#include "base/utf_string_conversions.h"
+#include "base/logging.h"
+#include "ui/gfx/compositor/layer.h"
+#include "ui/gfx/interpolated_transform.h"
+#include "ui/gfx/transform.h"
+
+namespace ui {
+
+namespace {
+
+void PrintLayerHierarchyImp(const Layer* layer, int indent) {
+  if (!layer->visible())
+    return;
+
+  std::wostringstream buf;
+  std::string indent_str(indent, ' ');
+  std::string content_indent_str(indent+1, ' ');
+
+  buf << UTF8ToWide(indent_str);
+  buf << L'+' << UTF8ToWide(layer->name()) << L' ' << layer;
+
+  buf << L'\n' << UTF8ToWide(content_indent_str);
+  buf << L"bounds: " << layer->bounds().x() << L',' << layer->bounds().y();
+  buf << L' ' << layer->bounds().width() << L'x' << layer->bounds().height();
+
+  if (!layer->hole_rect().IsEmpty()) {
+    buf << L'\n' << UTF8ToWide(content_indent_str);
+    gfx::Rect hole_rect = layer->hole_rect();
+    buf << L"hole: " << hole_rect.x() << L',' << hole_rect.y();
+    buf << L' ' << hole_rect.width() << L'x' << hole_rect.height();
+  }
+
+  if (layer->opacity() != 1.0f) {
+    buf << L'\n' << UTF8ToWide(content_indent_str);
+    buf << L"opacity: " << std::setprecision(2) << layer->opacity();
+  }
+
+  if (layer->transform().HasChange()) {
+    gfx::Point translation;
+    float rotation;
+    gfx::Point3f scale;
+    if (ui::InterpolatedTransform::FactorTRS(layer->transform(),
+                                             &translation,
+                                             &rotation,
+                                             &scale)) {
+      if (translation != gfx::Point(0, 0)) {

[tfarina, 2011/11/11 18:46:28]

nit: gfx::Point(0, 0) -> gfx::Point()?

+        buf << L'\n' << UTF8ToWide(content_indent_str);
+        buf << L"translation: " << translation.x() << L", " << translation.y();
+      }
+
+      if (fabs(rotation) > 1e-5) {
+        buf << L'\n' << UTF8ToWide(content_indent_str);
+        buf << L"rotation: " << std::setprecision(4) << rotation;
+      }
+
+      if (scale.AsPoint() != gfx::Point(0, 0)) {
+        buf << L'\n' << UTF8ToWide(content_indent_str);
+        buf << std::setprecision(4);
+        buf << L"scale: " << scale.x() << L", " << scale.y();
+      }
+    }
+  }
+
+  VLOG(1) << buf.str();
+  std::cout << buf.str() << std::endl;
+
+  for (size_t i = 0, count = layer->children().size(); i < count; i++)

[tfarina, 2011/11/11 18:46:28]

do we really need to cache size() here? is for performance? I really don't care
to much, just wondering.

[tfarina, 2011/11/11 18:46:28]

++i

+    PrintLayerHierarchyImp(layer->children()[i], indent + 3);
+}
+
+} // namespace

[tfarina, 2011/11/11 18:46:28]

nit: there should be two spaces between } and // not just one.

+
+void PrintLayerHierarchy(const Layer* layer) {
+  PrintLayerHierarchyImp(layer, 0);
+}
+
+} // namespace ui
+
+#endif // NDEBUG