1 files changed, 101 insertions, 0 deletions
diff --git a/chromium/content/renderer/compositor_bindings/web_layer_impl_fixed_bounds.cc b/chromium/content/renderer/compositor_bindings/web_layer_impl_fixed_bounds.cc
new file mode 100644
index 00000000000..b3195f9946c
--- /dev/null
+++ b/chromium/content/renderer/compositor_bindings/web_layer_impl_fixed_bounds.cc
@@ -0,0 +1,101 @@
+// 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 "content/renderer/compositor_bindings/web_layer_impl_fixed_bounds.h"
+
+#include "cc/layers/layer.h"
+#include "third_party/WebKit/public/platform/WebFloatPoint.h"
+#include "third_party/WebKit/public/platform/WebSize.h"
+#include "third_party/skia/include/utils/SkMatrix44.h"
+
+using cc::Layer;
+
+namespace content {
+
+WebLayerImplFixedBounds::WebLayerImplFixedBounds() {
+}
+
+WebLayerImplFixedBounds::WebLayerImplFixedBounds(scoped_refptr<Layer> layer)
+    : WebLayerImpl(layer) {
+}
+
+WebLayerImplFixedBounds::~WebLayerImplFixedBounds() {
+}
+
+void WebLayerImplFixedBounds::invalidateRect(const blink::WebFloatRect& rect) {
+  // Partial invalidations seldom occur for such layers.
+  // Simply invalidate the whole layer to avoid transformation of coordinates.
+  invalidate();
+}
+
+void WebLayerImplFixedBounds::setTransformOrigin(
+    const blink::WebFloatPoint3D& transform_origin) {
+  if (transform_origin != this->transformOrigin()) {
+    layer_->SetTransformOrigin(transform_origin);
+    UpdateLayerBoundsAndTransform();
+  }
+}
+
+void WebLayerImplFixedBounds::setBounds(const blink::WebSize& bounds) {
+  if (original_bounds_ != gfx::Size(bounds)) {
+    original_bounds_ = bounds;
+    UpdateLayerBoundsAndTransform();
+  }
+}
+
+blink::WebSize WebLayerImplFixedBounds::bounds() const {
+  return original_bounds_;
+}
+
+void WebLayerImplFixedBounds::setTransform(const SkMatrix44& matrix) {
+  gfx::Transform transform;
+  transform.matrix() = matrix;
+  SetTransformInternal(transform);
+}
+
+SkMatrix44 WebLayerImplFixedBounds::transform() const {
+  return original_transform_.matrix();
+}
+
+void WebLayerImplFixedBounds::SetFixedBounds(gfx::Size fixed_bounds) {
+  if (fixed_bounds_ != fixed_bounds) {
+    fixed_bounds_ = fixed_bounds;
+    UpdateLayerBoundsAndTransform();
+  }
+}
+
+void WebLayerImplFixedBounds::SetTransformInternal(
+    const gfx::Transform& transform) {
+  if (original_transform_ != transform) {
+    original_transform_ = transform;
+    UpdateLayerBoundsAndTransform();
+  }
+}
+
+void WebLayerImplFixedBounds::UpdateLayerBoundsAndTransform() {
+  if (fixed_bounds_.IsEmpty() || original_bounds_.IsEmpty() ||
+      fixed_bounds_ == original_bounds_ ||
+      // For now fall back to non-fixed bounds for non-zero transform origin.
+      // TODO(wangxianzhu): Support non-zero anchor point for fixed bounds.
+      transformOrigin().x ||
+      transformOrigin().y) {
+    layer_->SetBounds(original_bounds_);
+    layer_->SetTransform(original_transform_);
+    return;
+  }
+
+  layer_->SetBounds(fixed_bounds_);
+
+  // Apply bounds scale (bounds/fixed_bounds) over original transform.
+  gfx::Transform transform_with_bounds_scale(original_transform_);
+  float bounds_scale_x =
+      static_cast<float>(original_bounds_.width()) / fixed_bounds_.width();
+  float bounds_scale_y =
+      static_cast<float>(original_bounds_.height()) / fixed_bounds_.height();
+  transform_with_bounds_scale.Scale(bounds_scale_x, bounds_scale_y);
+  layer_->SetTransform(transform_with_bounds_scale);
+}
+
+}  // namespace content
+