PathCache.cpp revision 9cccc2b9bdd4850a3f9679569aaec3ab98477a5d
1/* 2 * Copyright (C) 2010 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#define LOG_TAG "OpenGLRenderer" 18 19#include <GLES2/gl2.h> 20 21#include <SkCanvas.h> 22#include <SkRect.h> 23 24#include "PathCache.h" 25 26namespace android { 27namespace uirenderer { 28 29/////////////////////////////////////////////////////////////////////////////// 30// Constructors/destructor 31/////////////////////////////////////////////////////////////////////////////// 32 33PathCache::PathCache(uint32_t maxByteSize): 34 mCache(GenerationCache<PathCacheEntry, PathTexture*>::kUnlimitedCapacity), 35 mSize(0), mMaxSize(maxByteSize) { 36 mCache.setOnEntryRemovedListener(this); 37 38 GLint maxTextureSize; 39 glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxTextureSize); 40 mMaxTextureSize = maxTextureSize; 41} 42 43PathCache::~PathCache() { 44 mCache.clear(); 45} 46 47/////////////////////////////////////////////////////////////////////////////// 48// Size management 49/////////////////////////////////////////////////////////////////////////////// 50 51uint32_t PathCache::getSize() { 52 return mSize; 53} 54 55uint32_t PathCache::getMaxSize() { 56 return mMaxSize; 57} 58 59void PathCache::setMaxSize(uint32_t maxSize) { 60 mMaxSize = maxSize; 61 while (mSize > mMaxSize) { 62 mCache.removeOldest(); 63 } 64} 65 66/////////////////////////////////////////////////////////////////////////////// 67// Callbacks 68/////////////////////////////////////////////////////////////////////////////// 69 70void PathCache::operator()(PathCacheEntry& path, PathTexture*& texture) { 71 const uint32_t size = texture->width * texture->height; 72 mSize -= size; 73 74 if (texture) { 75 glDeleteTextures(1, &texture->id); 76 delete texture; 77 } 78} 79 80/////////////////////////////////////////////////////////////////////////////// 81// Caching 82/////////////////////////////////////////////////////////////////////////////// 83 84PathTexture* PathCache::get(SkPath* path, SkPaint* paint) { 85 PathCacheEntry entry(path, paint); 86 PathTexture* texture = mCache.get(entry); 87 88 if (!texture) { 89 texture = addTexture(entry, path, paint); 90 } else if (path->getGenerationID() != texture->generation) { 91 mCache.remove(entry); 92 texture = addTexture(entry, path, paint); 93 } 94 95 return texture; 96} 97 98PathTexture* PathCache::addTexture(const PathCacheEntry& entry, 99 const SkPath *path, const SkPaint* paint) { 100 const SkRect& bounds = path->getBounds(); 101 102 const float pathWidth = bounds.width(); 103 const float pathHeight = bounds.height(); 104 105 if (pathWidth > mMaxTextureSize || pathHeight > mMaxTextureSize) { 106 LOGW("Path too large to be rendered into a texture"); 107 return NULL; 108 } 109 110 const float offset = entry.strokeWidth * 1.5f; 111 const uint32_t width = uint32_t(pathWidth + offset * 2.0 + 0.5); 112 const uint32_t height = uint32_t(pathHeight + offset * 2.0 + 0.5); 113 114 const uint32_t size = width * height; 115 // Don't even try to cache a bitmap that's bigger than the cache 116 if (size < mMaxSize) { 117 while (mSize + size > mMaxSize) { 118 mCache.removeOldest(); 119 } 120 } 121 122 PathTexture* texture = new PathTexture; 123 texture->left = bounds.fLeft; 124 texture->top = bounds.fTop; 125 texture->offset = offset; 126 texture->width = width; 127 texture->height = height; 128 texture->generation = path->getGenerationID(); 129 130 SkBitmap bitmap; 131 bitmap.setConfig(SkBitmap::kA8_Config, width, height); 132 bitmap.allocPixels(); 133 bitmap.eraseColor(0); 134 135 SkCanvas canvas(bitmap); 136 canvas.translate(-bounds.fLeft + offset, -bounds.fTop + offset); 137 canvas.drawPath(*path, *paint); 138 139 generateTexture(bitmap, texture); 140 141 if (size < mMaxSize) { 142 mSize += size; 143 mCache.put(entry, texture); 144 } else { 145 texture->cleanup = true; 146 } 147 148 return texture; 149} 150 151void PathCache::clear() { 152 mCache.clear(); 153} 154 155void PathCache::generateTexture(SkBitmap& bitmap, Texture* texture) { 156 SkAutoLockPixels alp(bitmap); 157 if (!bitmap.readyToDraw()) { 158 LOGE("Cannot generate texture from bitmap"); 159 return; 160 } 161 162 glGenTextures(1, &texture->id); 163 164 glBindTexture(GL_TEXTURE_2D, texture->id); 165 glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap.bytesPerPixel()); 166 167 texture->blend = true; 168 glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, bitmap.rowBytesAsPixels(), texture->height, 0, 169 GL_ALPHA, GL_UNSIGNED_BYTE, bitmap.getPixels()); 170 171 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 172 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 173 174 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 175 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 176} 177 178}; // namespace uirenderer 179}; // namespace android 180