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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "content/renderer/compositor_bindings/web_layer_impl_fixed_bounds.h" | |
6 | |
7 #include "cc/layers/layer.h" | |
8 #include "third_party/WebKit/public/platform/WebFloatPoint.h" | |
9 #include "third_party/WebKit/public/platform/WebSize.h" | |
10 #include "third_party/skia/include/utils/SkMatrix44.h" | |
11 | |
12 using cc::Layer; | |
13 | |
14 namespace content { | |
15 | |
16 WebLayerImplFixedBounds::WebLayerImplFixedBounds() { | |
17 } | |
18 | |
19 WebLayerImplFixedBounds::WebLayerImplFixedBounds(scoped_refptr<Layer> layer) | |
20 : WebLayerImpl(layer) { | |
21 } | |
22 | |
23 WebLayerImplFixedBounds::~WebLayerImplFixedBounds() { | |
24 } | |
25 | |
26 void WebLayerImplFixedBounds::invalidateRect(const blink::WebFloatRect& rect) { | |
27 // Partial invalidations seldom occur for such layers. | |
28 // Simply invalidate the whole layer to avoid transformation of coordinates. | |
29 invalidate(); | |
30 } | |
31 | |
32 void WebLayerImplFixedBounds::setTransformOrigin( | |
33 const blink::WebFloatPoint3D& transform_origin) { | |
34 if (transform_origin != this->transformOrigin()) { | |
35 layer_->SetTransformOrigin(transform_origin); | |
36 UpdateLayerBoundsAndTransform(); | |
37 } | |
38 } | |
39 | |
40 void WebLayerImplFixedBounds::setBounds(const blink::WebSize& bounds) { | |
41 if (original_bounds_ != gfx::Size(bounds)) { | |
42 original_bounds_ = bounds; | |
43 UpdateLayerBoundsAndTransform(); | |
44 } | |
45 } | |
46 | |
47 blink::WebSize WebLayerImplFixedBounds::bounds() const { | |
48 return original_bounds_; | |
49 } | |
50 | |
51 void WebLayerImplFixedBounds::setTransform(const SkMatrix44& matrix) { | |
52 gfx::Transform transform; | |
53 transform.matrix() = matrix; | |
54 SetTransformInternal(transform); | |
55 } | |
56 | |
57 SkMatrix44 WebLayerImplFixedBounds::transform() const { | |
58 return original_transform_.matrix(); | |
59 } | |
60 | |
61 void WebLayerImplFixedBounds::SetFixedBounds(gfx::Size fixed_bounds) { | |
62 if (fixed_bounds_ != fixed_bounds) { | |
63 fixed_bounds_ = fixed_bounds; | |
64 UpdateLayerBoundsAndTransform(); | |
65 } | |
66 } | |
67 | |
68 void WebLayerImplFixedBounds::SetTransformInternal( | |
69 const gfx::Transform& transform) { | |
70 if (original_transform_ != transform) { | |
71 original_transform_ = transform; | |
72 UpdateLayerBoundsAndTransform(); | |
73 } | |
74 } | |
75 | |
76 void WebLayerImplFixedBounds::UpdateLayerBoundsAndTransform() { | |
77 if (fixed_bounds_.IsEmpty() || original_bounds_.IsEmpty() || | |
78 fixed_bounds_ == original_bounds_ || | |
79 // For now fall back to non-fixed bounds for non-zero transform origin. | |
80 // TODO(wangxianzhu): Support non-zero anchor point for fixed bounds. | |
81 transformOrigin().x || | |
82 transformOrigin().y) { | |
83 layer_->SetBounds(original_bounds_); | |
84 layer_->SetTransform(original_transform_); | |
85 return; | |
86 } | |
87 | |
88 layer_->SetBounds(fixed_bounds_); | |
89 | |
90 // Apply bounds scale (bounds/fixed_bounds) over original transform. | |
91 gfx::Transform transform_with_bounds_scale(original_transform_); | |
92 float bounds_scale_x = | |
93 static_cast<float>(original_bounds_.width()) / fixed_bounds_.width(); | |
94 float bounds_scale_y = | |
95 static_cast<float>(original_bounds_.height()) / fixed_bounds_.height(); | |
96 transform_with_bounds_scale.Scale(bounds_scale_x, bounds_scale_y); | |
97 layer_->SetTransform(transform_with_bounds_scale); | |
98 } | |
99 | |
100 } // namespace content | |
101 | |
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