1 /*
2 * Copyright (C) 2015 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 "OffscreenBufferPool.h"
18
19 #include "Caches.h"
20 #include "Properties.h"
21 #include "renderstate/RenderState.h"
22 #include "utils/FatVector.h"
23 #include "utils/TraceUtils.h"
24
25 #include <utils/Color.h>
26 #include <utils/Log.h>
27
28 #include <GLES2/gl2.h>
29
30 namespace android {
31 namespace uirenderer {
32
33 ////////////////////////////////////////////////////////////////////////////////
34 // OffscreenBuffer
35 ////////////////////////////////////////////////////////////////////////////////
36
OffscreenBuffer(RenderState & renderState,Caches & caches,uint32_t viewportWidth,uint32_t viewportHeight)37 OffscreenBuffer::OffscreenBuffer(RenderState& renderState, Caches& caches,
38 uint32_t viewportWidth, uint32_t viewportHeight)
39 : GpuMemoryTracker(GpuObjectType::OffscreenBuffer)
40 , renderState(renderState)
41 , viewportWidth(viewportWidth)
42 , viewportHeight(viewportHeight)
43 , texture(caches) {
44 uint32_t width = computeIdealDimension(viewportWidth);
45 uint32_t height = computeIdealDimension(viewportHeight);
46 ATRACE_FORMAT("Allocate %ux%u HW Layer", width, height);
47 caches.textureState().activateTexture(0);
48 texture.resize(width, height, caches.rgbaInternalFormat(), GL_RGBA);
49 texture.blend = true;
50 texture.setWrap(GL_CLAMP_TO_EDGE);
51 // not setting filter on texture, since it's set when drawing, based on transform
52 }
53
getTextureCoordinates()54 Rect OffscreenBuffer::getTextureCoordinates() {
55 const float texX = 1.0f / static_cast<float>(texture.width());
56 const float texY = 1.0f / static_cast<float>(texture.height());
57 return Rect(0, viewportHeight * texY, viewportWidth * texX, 0);
58 }
59
dirty(Rect dirtyArea)60 void OffscreenBuffer::dirty(Rect dirtyArea) {
61 dirtyArea.doIntersect(0, 0, viewportWidth, viewportHeight);
62 if (!dirtyArea.isEmpty()) {
63 region.orSelf(android::Rect(dirtyArea.left, dirtyArea.top,
64 dirtyArea.right, dirtyArea.bottom));
65 }
66 }
67
updateMeshFromRegion()68 void OffscreenBuffer::updateMeshFromRegion() {
69 // avoid T-junctions as they cause artifacts in between the resultant
70 // geometry when complex transforms occur.
71 // TODO: generate the safeRegion only if necessary based on drawing transform
72 Region safeRegion = Region::createTJunctionFreeRegion(region);
73
74 size_t count;
75 const android::Rect* rects = safeRegion.getArray(&count);
76
77 const float texX = 1.0f / float(texture.width());
78 const float texY = 1.0f / float(texture.height());
79
80 FatVector<TextureVertex, 64> meshVector(count * 4); // uses heap if more than 64 vertices needed
81 TextureVertex* mesh = &meshVector[0];
82 for (size_t i = 0; i < count; i++) {
83 const android::Rect* r = &rects[i];
84
85 const float u1 = r->left * texX;
86 const float v1 = (viewportHeight - r->top) * texY;
87 const float u2 = r->right * texX;
88 const float v2 = (viewportHeight - r->bottom) * texY;
89
90 TextureVertex::set(mesh++, r->left, r->top, u1, v1);
91 TextureVertex::set(mesh++, r->right, r->top, u2, v1);
92 TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
93 TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
94 }
95 elementCount = count * 6;
96 renderState.meshState().genOrUpdateMeshBuffer(&vbo,
97 sizeof(TextureVertex) * count * 4,
98 &meshVector[0],
99 GL_DYNAMIC_DRAW); // TODO: GL_STATIC_DRAW if savelayer
100 }
101
computeIdealDimension(uint32_t dimension)102 uint32_t OffscreenBuffer::computeIdealDimension(uint32_t dimension) {
103 return uint32_t(ceilf(dimension / float(LAYER_SIZE)) * LAYER_SIZE);
104 }
105
~OffscreenBuffer()106 OffscreenBuffer::~OffscreenBuffer() {
107 ATRACE_FORMAT("Destroy %ux%u HW Layer", texture.width(), texture.height());
108 texture.deleteTexture();
109 renderState.meshState().deleteMeshBuffer(vbo);
110 elementCount = 0;
111 vbo = 0;
112 }
113
114 ///////////////////////////////////////////////////////////////////////////////
115 // OffscreenBufferPool
116 ///////////////////////////////////////////////////////////////////////////////
117
OffscreenBufferPool()118 OffscreenBufferPool::OffscreenBufferPool()
119 : mMaxSize(Properties::layerPoolSize) {
120 }
121
~OffscreenBufferPool()122 OffscreenBufferPool::~OffscreenBufferPool() {
123 clear(); // TODO: unique_ptr?
124 }
125
compare(const Entry & lhs,const Entry & rhs)126 int OffscreenBufferPool::Entry::compare(const Entry& lhs, const Entry& rhs) {
127 int deltaInt = int(lhs.width) - int(rhs.width);
128 if (deltaInt != 0) return deltaInt;
129
130 return int(lhs.height) - int(rhs.height);
131 }
132
clear()133 void OffscreenBufferPool::clear() {
134 for (auto& entry : mPool) {
135 delete entry.layer;
136 }
137 mPool.clear();
138 mSize = 0;
139 }
140
get(RenderState & renderState,const uint32_t width,const uint32_t height)141 OffscreenBuffer* OffscreenBufferPool::get(RenderState& renderState,
142 const uint32_t width, const uint32_t height) {
143 OffscreenBuffer* layer = nullptr;
144
145 Entry entry(width, height);
146 auto iter = mPool.find(entry);
147
148 if (iter != mPool.end()) {
149 entry = *iter;
150 mPool.erase(iter);
151
152 layer = entry.layer;
153 layer->viewportWidth = width;
154 layer->viewportHeight = height;
155 mSize -= layer->getSizeInBytes();
156 } else {
157 layer = new OffscreenBuffer(renderState, Caches::getInstance(), width, height);
158 }
159
160 return layer;
161 }
162
resize(OffscreenBuffer * layer,const uint32_t width,const uint32_t height)163 OffscreenBuffer* OffscreenBufferPool::resize(OffscreenBuffer* layer,
164 const uint32_t width, const uint32_t height) {
165 RenderState& renderState = layer->renderState;
166 if (layer->texture.width() == OffscreenBuffer::computeIdealDimension(width)
167 && layer->texture.height() == OffscreenBuffer::computeIdealDimension(height)) {
168 // resize in place
169 layer->viewportWidth = width;
170 layer->viewportHeight = height;
171
172 // entire area will be repainted (and may be smaller) so clear usage region
173 layer->region.clear();
174 return layer;
175 }
176 putOrDelete(layer);
177 return get(renderState, width, height);
178 }
179
dump()180 void OffscreenBufferPool::dump() {
181 for (auto entry : mPool) {
182 ALOGD(" Layer size %dx%d", entry.width, entry.height);
183 }
184 }
185
putOrDelete(OffscreenBuffer * layer)186 void OffscreenBufferPool::putOrDelete(OffscreenBuffer* layer) {
187 const uint32_t size = layer->getSizeInBytes();
188 // Don't even try to cache a layer that's bigger than the cache
189 if (size < mMaxSize) {
190 // TODO: Use an LRU
191 while (mSize + size > mMaxSize) {
192 OffscreenBuffer* victim = mPool.begin()->layer;
193 mSize -= victim->getSizeInBytes();
194 delete victim;
195 mPool.erase(mPool.begin());
196 }
197
198 // clear region, since it's no longer valid
199 layer->region.clear();
200
201 Entry entry(layer);
202
203 mPool.insert(entry);
204 mSize += size;
205 } else {
206 delete layer;
207 }
208 }
209
210 }; // namespace uirenderer
211 }; // namespace android
212