GradientCache.cpp revision 98ba89492a477114148fcb1f89675e41679ca7cc
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 <SkCanvas.h> 20#include <SkGradientShader.h> 21 22#include <utils/threads.h> 23 24#include "Debug.h" 25#include "GradientCache.h" 26#include "Properties.h" 27 28namespace android { 29namespace uirenderer { 30 31/////////////////////////////////////////////////////////////////////////////// 32// Constructors/destructor 33/////////////////////////////////////////////////////////////////////////////// 34 35GradientCache::GradientCache(): 36 mCache(GenerationCache<GradientCacheEntry, Texture*>::kUnlimitedCapacity), 37 mSize(0), mMaxSize(MB(DEFAULT_GRADIENT_CACHE_SIZE)) { 38 char property[PROPERTY_VALUE_MAX]; 39 if (property_get(PROPERTY_GRADIENT_CACHE_SIZE, property, NULL) > 0) { 40 INIT_LOGD(" Setting gradient cache size to %sMB", property); 41 setMaxSize(MB(atof(property))); 42 } else { 43 INIT_LOGD(" Using default gradient cache size of %.2fMB", DEFAULT_GRADIENT_CACHE_SIZE); 44 } 45 46 glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize); 47 48 mCache.setOnEntryRemovedListener(this); 49} 50 51GradientCache::GradientCache(uint32_t maxByteSize): 52 mCache(GenerationCache<GradientCacheEntry, Texture*>::kUnlimitedCapacity), 53 mSize(0), mMaxSize(maxByteSize) { 54 mCache.setOnEntryRemovedListener(this); 55} 56 57GradientCache::~GradientCache() { 58 mCache.clear(); 59} 60 61/////////////////////////////////////////////////////////////////////////////// 62// Size management 63/////////////////////////////////////////////////////////////////////////////// 64 65uint32_t GradientCache::getSize() { 66 return mSize; 67} 68 69uint32_t GradientCache::getMaxSize() { 70 return mMaxSize; 71} 72 73void GradientCache::setMaxSize(uint32_t maxSize) { 74 mMaxSize = maxSize; 75 while (mSize > mMaxSize) { 76 mCache.removeOldest(); 77 } 78} 79 80/////////////////////////////////////////////////////////////////////////////// 81// Callbacks 82/////////////////////////////////////////////////////////////////////////////// 83 84void GradientCache::operator()(GradientCacheEntry& shader, Texture*& texture) { 85 if (texture) { 86 const uint32_t size = texture->width * texture->height * 4; 87 mSize -= size; 88 } 89 90 if (texture) { 91 glDeleteTextures(1, &texture->id); 92 delete texture; 93 } 94} 95 96/////////////////////////////////////////////////////////////////////////////// 97// Caching 98/////////////////////////////////////////////////////////////////////////////// 99 100Texture* GradientCache::get(uint32_t* colors, float* positions, 101 int count, SkShader::TileMode tileMode) { 102 103 GradientCacheEntry gradient(colors, positions, count, tileMode); 104 Texture* texture = mCache.get(gradient); 105 106 if (!texture) { 107 texture = addLinearGradient(gradient, colors, positions, count, tileMode); 108 } 109 110 return texture; 111} 112 113void GradientCache::clear() { 114 mCache.clear(); 115} 116 117Texture* GradientCache::addLinearGradient(GradientCacheEntry& gradient, 118 uint32_t* colors, float* positions, int count, SkShader::TileMode tileMode) { 119 int width = 256 * (count - 1); 120 width = width < mMaxTextureSize ? width : mMaxTextureSize; 121 122 SkBitmap bitmap; 123 bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, 4); 124 bitmap.allocPixels(); 125 bitmap.eraseColor(0); 126 127 SkCanvas canvas(bitmap); 128 129 SkPoint points[2]; 130 points[0].set(0.0f, 0.0f); 131 points[1].set(bitmap.width(), 0.0f); 132 133 SkShader* localShader = SkGradientShader::CreateLinear(points, 134 reinterpret_cast<const SkColor*>(colors), positions, count, tileMode); 135 136 SkPaint p; 137 p.setStyle(SkPaint::kStrokeAndFill_Style); 138 p.setShader(localShader)->unref(); 139 140 canvas.drawRectCoords(0.0f, 0.0f, bitmap.width(), 4.0f, p); 141 142 // Asume the cache is always big enough 143 const uint32_t size = bitmap.rowBytes() * bitmap.height(); 144 while (mSize + size > mMaxSize) { 145 mCache.removeOldest(); 146 } 147 148 Texture* texture = new Texture; 149 generateTexture(&bitmap, texture); 150 151 mSize += size; 152 mCache.put(gradient, texture); 153 154 return texture; 155} 156 157void GradientCache::generateTexture(SkBitmap* bitmap, Texture* texture) { 158 SkAutoLockPixels autoLock(*bitmap); 159 if (!bitmap->readyToDraw()) { 160 ALOGE("Cannot generate texture from shader"); 161 return; 162 } 163 164 texture->generation = bitmap->getGenerationID(); 165 texture->width = bitmap->width(); 166 texture->height = bitmap->height(); 167 168 glGenTextures(1, &texture->id); 169 170 glBindTexture(GL_TEXTURE_2D, texture->id); 171 glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel()); 172 173 texture->blend = !bitmap->isOpaque(); 174 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bitmap->rowBytesAsPixels(), texture->height, 0, 175 GL_RGBA, GL_UNSIGNED_BYTE, bitmap->getPixels()); 176 177 texture->setFilter(GL_LINEAR); 178 texture->setWrap(GL_CLAMP_TO_EDGE); 179} 180 181}; // namespace uirenderer 182}; // namespace android 183