GradientCache.cpp revision a8557d2169e14997637f57bc897640c8882d4a46
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 <utils/threads.h> 20 21#include "Caches.h" 22#include "Debug.h" 23#include "GradientCache.h" 24#include "Properties.h" 25 26namespace android { 27namespace uirenderer { 28 29/////////////////////////////////////////////////////////////////////////////// 30// Defines 31/////////////////////////////////////////////////////////////////////////////// 32 33#define GRADIENT_TEXTURE_HEIGHT 2 34#define GRADIENT_BYTES_PER_PIXEL 4 35 36/////////////////////////////////////////////////////////////////////////////// 37// Functions 38/////////////////////////////////////////////////////////////////////////////// 39 40template<typename T> 41static inline T min(T a, T b) { 42 return a < b ? a : b; 43} 44 45/////////////////////////////////////////////////////////////////////////////// 46// Constructors/destructor 47/////////////////////////////////////////////////////////////////////////////// 48 49GradientCache::GradientCache(): 50 mCache(GenerationCache<GradientCacheEntry, Texture*>::kUnlimitedCapacity), 51 mSize(0), mMaxSize(MB(DEFAULT_GRADIENT_CACHE_SIZE)) { 52 char property[PROPERTY_VALUE_MAX]; 53 if (property_get(PROPERTY_GRADIENT_CACHE_SIZE, property, NULL) > 0) { 54 INIT_LOGD(" Setting gradient cache size to %sMB", property); 55 setMaxSize(MB(atof(property))); 56 } else { 57 INIT_LOGD(" Using default gradient cache size of %.2fMB", DEFAULT_GRADIENT_CACHE_SIZE); 58 } 59 60 glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize); 61 62 mCache.setOnEntryRemovedListener(this); 63} 64 65GradientCache::GradientCache(uint32_t maxByteSize): 66 mCache(GenerationCache<GradientCacheEntry, Texture*>::kUnlimitedCapacity), 67 mSize(0), mMaxSize(maxByteSize) { 68 mCache.setOnEntryRemovedListener(this); 69} 70 71GradientCache::~GradientCache() { 72 mCache.clear(); 73} 74 75/////////////////////////////////////////////////////////////////////////////// 76// Size management 77/////////////////////////////////////////////////////////////////////////////// 78 79uint32_t GradientCache::getSize() { 80 return mSize; 81} 82 83uint32_t GradientCache::getMaxSize() { 84 return mMaxSize; 85} 86 87void GradientCache::setMaxSize(uint32_t maxSize) { 88 mMaxSize = maxSize; 89 while (mSize > mMaxSize) { 90 mCache.removeOldest(); 91 } 92} 93 94/////////////////////////////////////////////////////////////////////////////// 95// Callbacks 96/////////////////////////////////////////////////////////////////////////////// 97 98void GradientCache::operator()(GradientCacheEntry& shader, Texture*& texture) { 99 if (texture) { 100 const uint32_t size = texture->width * texture->height * GRADIENT_BYTES_PER_PIXEL; 101 mSize -= size; 102 } 103 104 if (texture) { 105 glDeleteTextures(1, &texture->id); 106 delete texture; 107 } 108} 109 110/////////////////////////////////////////////////////////////////////////////// 111// Caching 112/////////////////////////////////////////////////////////////////////////////// 113 114Texture* GradientCache::get(uint32_t* colors, float* positions, int count) { 115 116 GradientCacheEntry gradient(colors, positions, count); 117 Texture* texture = mCache.get(gradient); 118 119 if (!texture) { 120 texture = addLinearGradient(gradient, colors, positions, count); 121 } 122 123 return texture; 124} 125 126void GradientCache::clear() { 127 mCache.clear(); 128} 129 130void GradientCache::getGradientInfo(const uint32_t* colors, const int count, 131 GradientInfo& info) { 132 uint32_t width = 256 * (count - 1); 133 134 if (!Caches::getInstance().extensions.hasNPot()) { 135 width = 1 << (31 - __builtin_clz(width)); 136 } 137 138 bool hasAlpha = false; 139 for (int i = 0; i < count; i++) { 140 if (((colors[i] >> 24) & 0xff) < 255) { 141 hasAlpha = true; 142 break; 143 } 144 } 145 146 info.width = min(width, uint32_t(mMaxTextureSize)); 147 info.hasAlpha = hasAlpha; 148} 149 150Texture* GradientCache::addLinearGradient(GradientCacheEntry& gradient, 151 uint32_t* colors, float* positions, int count) { 152 153 GradientInfo info; 154 getGradientInfo(colors, count, info); 155 156 Texture* texture = new Texture; 157 texture->width = info.width; 158 texture->height = GRADIENT_TEXTURE_HEIGHT; 159 texture->blend = info.hasAlpha; 160 texture->generation = 1; 161 162 // Asume the cache is always big enough 163 const uint32_t size = texture->width * texture->height * GRADIENT_BYTES_PER_PIXEL; 164 while (mSize + size > mMaxSize) { 165 mCache.removeOldest(); 166 } 167 168 generateTexture(colors, positions, count, texture); 169 170 mSize += size; 171 mCache.put(gradient, texture); 172 173 return texture; 174} 175 176void GradientCache::generateTexture(uint32_t* colors, float* positions, 177 int count, Texture* texture) { 178 179 const uint32_t width = texture->width; 180 const GLsizei rowBytes = width * GRADIENT_BYTES_PER_PIXEL; 181 uint32_t pixels[width * texture->height]; 182 183 int currentPos = 1; 184 185 float startA = (colors[0] >> 24) & 0xff; 186 float startR = (colors[0] >> 16) & 0xff; 187 float startG = (colors[0] >> 8) & 0xff; 188 float startB = (colors[0] >> 0) & 0xff; 189 190 float endA = (colors[1] >> 24) & 0xff; 191 float endR = (colors[1] >> 16) & 0xff; 192 float endG = (colors[1] >> 8) & 0xff; 193 float endB = (colors[1] >> 0) & 0xff; 194 195 float start = positions[0]; 196 float distance = positions[1] - start; 197 198 uint8_t* p = (uint8_t*) pixels; 199 for (uint32_t x = 0; x < width; x++) { 200 float pos = x / float(width - 1); 201 if (pos > positions[currentPos]) { 202 startA = endA; 203 startR = endR; 204 startG = endG; 205 startB = endB; 206 start = positions[currentPos]; 207 208 currentPos++; 209 210 endA = (colors[currentPos] >> 24) & 0xff; 211 endR = (colors[currentPos] >> 16) & 0xff; 212 endG = (colors[currentPos] >> 8) & 0xff; 213 endB = (colors[currentPos] >> 0) & 0xff; 214 distance = positions[currentPos] - start; 215 } 216 217 float amount = (pos - start) / distance; 218 float oppAmount = 1.0f - amount; 219 220 const float alpha = startA * oppAmount + endA * amount; 221 const float a = alpha / 255.0f; 222 *p++ = uint8_t(a * (startR * oppAmount + endR * amount)); 223 *p++ = uint8_t(a * (startG * oppAmount + endG * amount)); 224 *p++ = uint8_t(a * (startB * oppAmount + endB * amount)); 225 *p++ = uint8_t(alpha); 226 } 227 228 for (int i = 1; i < GRADIENT_TEXTURE_HEIGHT; i++) { 229 memcpy(pixels + width * i, pixels, rowBytes); 230 } 231 232 glGenTextures(1, &texture->id); 233 234 glBindTexture(GL_TEXTURE_2D, texture->id); 235 glPixelStorei(GL_UNPACK_ALIGNMENT, GRADIENT_BYTES_PER_PIXEL); 236 237 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, texture->height, 0, 238 GL_RGBA, GL_UNSIGNED_BYTE, pixels); 239 240 texture->setFilter(GL_LINEAR); 241 texture->setWrap(GL_CLAMP_TO_EDGE); 242} 243 244}; // namespace uirenderer 245}; // namespace android 246