PathCache.cpp revision 7fbcc0492fca03857e3c45064f4aa040af817d55
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 39PathCache::~PathCache() { 40 mCache.clear(); 41} 42 43/////////////////////////////////////////////////////////////////////////////// 44// Size management 45/////////////////////////////////////////////////////////////////////////////// 46 47uint32_t PathCache::getSize() { 48 return mSize; 49} 50 51uint32_t PathCache::getMaxSize() { 52 return mMaxSize; 53} 54 55void PathCache::setMaxSize(uint32_t maxSize) { 56 mMaxSize = maxSize; 57 while (mSize > mMaxSize) { 58 mCache.removeOldest(); 59 } 60} 61 62/////////////////////////////////////////////////////////////////////////////// 63// Callbacks 64/////////////////////////////////////////////////////////////////////////////// 65 66void PathCache::operator()(PathCacheEntry& path, PathTexture*& texture) { 67 const uint32_t size = texture->width * texture->height; 68 mSize -= size; 69 70 if (texture) { 71 glDeleteTextures(1, &texture->id); 72 delete texture; 73 } 74} 75 76/////////////////////////////////////////////////////////////////////////////// 77// Caching 78/////////////////////////////////////////////////////////////////////////////// 79 80PathTexture* PathCache::get(SkPath* path, SkPaint* paint) { 81 PathCacheEntry entry(path, paint); 82 PathTexture* texture = mCache.get(entry); 83 84 if (!texture) { 85 texture = addTexture(entry, path, paint); 86 } else if (path->getGenerationID() != texture->generation) { 87 mCache.remove(entry); 88 texture = addTexture(entry, path, paint); 89 } 90 91 // TODO: Do something to destroy the texture object if it's too big for the cache 92 return texture; 93} 94 95PathTexture* PathCache::addTexture(const PathCacheEntry& entry, 96 const SkPath *path, const SkPaint* paint) { 97 const SkRect& bounds = path->getBounds(); 98 const float offset = entry.strokeWidth * 1.5f; 99 const uint32_t width = uint32_t(bounds.width() + offset * 2.0 + 0.5); 100 const uint32_t height = uint32_t(bounds.height() + offset * 2.0 + 0.5); 101 102 const uint32_t size = width * height; 103 // Don't even try to cache a bitmap that's bigger than the cache 104 if (size < mMaxSize) { 105 while (mSize + size > mMaxSize) { 106 mCache.removeOldest(); 107 } 108 } 109 110 PathTexture* texture = new PathTexture; 111 texture->left = bounds.fLeft; 112 texture->top = bounds.fTop; 113 texture->offset = offset; 114 texture->width = width; 115 texture->height = height; 116 texture->generation = path->getGenerationID(); 117 118 SkBitmap bitmap; 119 bitmap.setConfig(SkBitmap::kA8_Config, width, height); 120 bitmap.allocPixels(); 121 bitmap.eraseColor(0); 122 123 SkCanvas canvas(bitmap); 124 canvas.translate(-bounds.fLeft + offset, -bounds.fTop + offset); 125 canvas.drawPath(*path, *paint); 126 127 generateTexture(bitmap, texture); 128 129 if (size < mMaxSize) { 130 mSize += size; 131 mCache.put(entry, texture); 132 } 133 134 return texture; 135} 136 137void PathCache::clear() { 138 mCache.clear(); 139} 140 141void PathCache::generateTexture(SkBitmap& bitmap, Texture* texture) { 142 SkAutoLockPixels alp(bitmap); 143 if (!bitmap.readyToDraw()) { 144 LOGE("Cannot generate texture from bitmap"); 145 return; 146 } 147 148 glGenTextures(1, &texture->id); 149 150 glBindTexture(GL_TEXTURE_2D, texture->id); 151 glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap.bytesPerPixel()); 152 153 texture->blend = true; 154 glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, bitmap.rowBytesAsPixels(), texture->height, 0, 155 GL_ALPHA, GL_UNSIGNED_BYTE, bitmap.getPixels()); 156 157 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 158 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 159 160 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 161 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 162} 163 164}; // namespace uirenderer 165}; // namespace android 166