1 /*
2 * Copyright 2020 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <ui/GraphicTypes.h>
18 #include <ui/Transform.h>
19
20 #include "ContainerLayer.h"
21 #include "DisplayDevice.h"
22 #include "Layer.h"
23 #include "LayerRenderArea.h"
24 #include "SurfaceFlinger.h"
25
26 namespace android {
27 namespace {
28
29 struct ReparentForDrawing {
30 const sp<Layer>& oldParent;
31
ReparentForDrawingandroid::__anon13df28aa0110::ReparentForDrawing32 ReparentForDrawing(const sp<Layer>& oldParent, const sp<Layer>& newParent,
33 const Rect& drawingBounds)
34 : oldParent(oldParent) {
35 // Compute and cache the bounds for the new parent layer.
36 newParent->computeBounds(drawingBounds.toFloatRect(), ui::Transform(),
37 0.f /* shadowRadius */);
38 oldParent->setChildrenDrawingParent(newParent);
39 }
~ReparentForDrawingandroid::__anon13df28aa0110::ReparentForDrawing40 ~ReparentForDrawing() { oldParent->setChildrenDrawingParent(oldParent); }
41 };
42
43 } // namespace
44
LayerRenderArea(SurfaceFlinger & flinger,sp<Layer> layer,const Rect & crop,ui::Size reqSize,ui::Dataspace reqDataSpace,bool childrenOnly,const Rect & layerStackRect,bool allowSecureLayers)45 LayerRenderArea::LayerRenderArea(SurfaceFlinger& flinger, sp<Layer> layer, const Rect& crop,
46 ui::Size reqSize, ui::Dataspace reqDataSpace, bool childrenOnly,
47 const Rect& layerStackRect, bool allowSecureLayers)
48 : RenderArea(reqSize, CaptureFill::CLEAR, reqDataSpace, layerStackRect, allowSecureLayers),
49 mLayer(std::move(layer)),
50 mCrop(crop),
51 mFlinger(flinger),
52 mChildrenOnly(childrenOnly) {}
53
getTransform() const54 const ui::Transform& LayerRenderArea::getTransform() const {
55 return mTransform;
56 }
57
getBounds() const58 Rect LayerRenderArea::getBounds() const {
59 return mLayer->getBufferSize(mLayer->getDrawingState());
60 }
61
getHeight() const62 int LayerRenderArea::getHeight() const {
63 return mLayer->getBufferSize(mLayer->getDrawingState()).getHeight();
64 }
65
getWidth() const66 int LayerRenderArea::getWidth() const {
67 return mLayer->getBufferSize(mLayer->getDrawingState()).getWidth();
68 }
69
isSecure() const70 bool LayerRenderArea::isSecure() const {
71 return mAllowSecureLayers;
72 }
73
needsFiltering() const74 bool LayerRenderArea::needsFiltering() const {
75 return mNeedsFiltering;
76 }
77
getDisplayDevice() const78 sp<const DisplayDevice> LayerRenderArea::getDisplayDevice() const {
79 return nullptr;
80 }
81
getSourceCrop() const82 Rect LayerRenderArea::getSourceCrop() const {
83 if (mCrop.isEmpty()) {
84 return getBounds();
85 } else {
86 return mCrop;
87 }
88 }
89
render(std::function<void ()> drawLayers)90 void LayerRenderArea::render(std::function<void()> drawLayers) {
91 using namespace std::string_literals;
92
93 const Rect sourceCrop = getSourceCrop();
94 // no need to check rotation because there is none
95 mNeedsFiltering = sourceCrop.width() != getReqWidth() || sourceCrop.height() != getReqHeight();
96
97 // If layer is offscreen, update mirroring info if it exists
98 if (mLayer->isRemovedFromCurrentState()) {
99 mLayer->traverse(LayerVector::StateSet::Drawing,
100 [&](Layer* layer) { layer->updateMirrorInfo(); });
101 mLayer->traverse(LayerVector::StateSet::Drawing,
102 [&](Layer* layer) { layer->updateCloneBufferInfo(); });
103 }
104
105 if (!mChildrenOnly) {
106 mTransform = mLayer->getTransform().inverse();
107 // If the layer is offscreen, compute bounds since we don't compute bounds for offscreen
108 // layers in a regular cycles.
109 if (mLayer->isRemovedFromCurrentState()) {
110 FloatRect maxBounds = mFlinger.getMaxDisplayBounds();
111 mLayer->computeBounds(maxBounds, ui::Transform(), 0.f /* shadowRadius */);
112 }
113 drawLayers();
114 } else {
115 uint32_t w = static_cast<uint32_t>(getWidth());
116 uint32_t h = static_cast<uint32_t>(getHeight());
117 // In the "childrenOnly" case we reparent the children to a screenshot
118 // layer which has no properties set and which does not draw.
119 sp<ContainerLayer> screenshotParentLayer = mFlinger.getFactory().createContainerLayer(
120 {&mFlinger, nullptr, "Screenshot Parent"s, w, h, 0, LayerMetadata()});
121
122 ReparentForDrawing reparent(mLayer, screenshotParentLayer, sourceCrop);
123 drawLayers();
124 }
125 }
126
127 } // namespace android
128