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/JenkinsHash.h> 20 21 #include "Caches.h" 22 #include "Debug.h" 23 #include "GradientCache.h" 24 #include "Properties.h" 25 26 namespace android { 27 namespace uirenderer { 28 29 /////////////////////////////////////////////////////////////////////////////// 30 // Functions 31 /////////////////////////////////////////////////////////////////////////////// 32 33 template<typename T> 34 static inline T min(T a, T b) { 35 return a < b ? a : b; 36 } 37 38 /////////////////////////////////////////////////////////////////////////////// 39 // Cache entry 40 /////////////////////////////////////////////////////////////////////////////// 41 42 hash_t GradientCacheEntry::hash() const { 43 uint32_t hash = JenkinsHashMix(0, count); 44 for (uint32_t i = 0; i < count; i++) { 45 hash = JenkinsHashMix(hash, android::hash_type(colors[i])); 46 hash = JenkinsHashMix(hash, android::hash_type(positions[i])); 47 } 48 return JenkinsHashWhiten(hash); 49 } 50 51 int GradientCacheEntry::compare(const GradientCacheEntry& lhs, const GradientCacheEntry& rhs) { 52 int deltaInt = int(lhs.count) - int(rhs.count); 53 if (deltaInt != 0) return deltaInt; 54 55 deltaInt = memcmp(lhs.colors, rhs.colors, lhs.count * sizeof(uint32_t)); 56 if (deltaInt != 0) return deltaInt; 57 58 return memcmp(lhs.positions, rhs.positions, lhs.count * sizeof(float)); 59 } 60 61 /////////////////////////////////////////////////////////////////////////////// 62 // Constructors/destructor 63 /////////////////////////////////////////////////////////////////////////////// 64 65 GradientCache::GradientCache(): 66 mCache(LruCache<GradientCacheEntry, Texture*>::kUnlimitedCapacity), 67 mSize(0), mMaxSize(MB(DEFAULT_GRADIENT_CACHE_SIZE)) { 68 char property[PROPERTY_VALUE_MAX]; 69 if (property_get(PROPERTY_GRADIENT_CACHE_SIZE, property, NULL) > 0) { 70 INIT_LOGD(" Setting gradient cache size to %sMB", property); 71 setMaxSize(MB(atof(property))); 72 } else { 73 INIT_LOGD(" Using default gradient cache size of %.2fMB", DEFAULT_GRADIENT_CACHE_SIZE); 74 } 75 76 glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize); 77 78 mCache.setOnEntryRemovedListener(this); 79 80 const Extensions& extensions = Extensions::getInstance(); 81 mUseFloatTexture = extensions.hasFloatTextures(); 82 mHasNpot = extensions.hasNPot(); 83 } 84 85 GradientCache::GradientCache(uint32_t maxByteSize): 86 mCache(LruCache<GradientCacheEntry, Texture*>::kUnlimitedCapacity), 87 mSize(0), mMaxSize(maxByteSize) { 88 mCache.setOnEntryRemovedListener(this); 89 } 90 91 GradientCache::~GradientCache() { 92 mCache.clear(); 93 } 94 95 /////////////////////////////////////////////////////////////////////////////// 96 // Size management 97 /////////////////////////////////////////////////////////////////////////////// 98 99 uint32_t GradientCache::getSize() { 100 return mSize; 101 } 102 103 uint32_t GradientCache::getMaxSize() { 104 return mMaxSize; 105 } 106 107 void GradientCache::setMaxSize(uint32_t maxSize) { 108 mMaxSize = maxSize; 109 while (mSize > mMaxSize) { 110 mCache.removeOldest(); 111 } 112 } 113 114 /////////////////////////////////////////////////////////////////////////////// 115 // Callbacks 116 /////////////////////////////////////////////////////////////////////////////// 117 118 void GradientCache::operator()(GradientCacheEntry&, Texture*& texture) { 119 if (texture) { 120 const uint32_t size = texture->width * texture->height * bytesPerPixel(); 121 mSize -= size; 122 123 texture->deleteTexture(); 124 delete texture; 125 } 126 } 127 128 /////////////////////////////////////////////////////////////////////////////// 129 // Caching 130 /////////////////////////////////////////////////////////////////////////////// 131 132 Texture* GradientCache::get(uint32_t* colors, float* positions, int count) { 133 GradientCacheEntry gradient(colors, positions, count); 134 Texture* texture = mCache.get(gradient); 135 136 if (!texture) { 137 texture = addLinearGradient(gradient, colors, positions, count); 138 } 139 140 return texture; 141 } 142 143 void GradientCache::clear() { 144 mCache.clear(); 145 } 146 147 void GradientCache::getGradientInfo(const uint32_t* colors, const int count, 148 GradientInfo& info) { 149 uint32_t width = 256 * (count - 1); 150 151 // If the npot extension is not supported we cannot use non-clamp 152 // wrap modes. We therefore find the nearest largest power of 2 153 // unless width is already a power of 2 154 if (!mHasNpot && (width & (width - 1)) != 0) { 155 width = 1 << (32 - __builtin_clz(width)); 156 } 157 158 bool hasAlpha = false; 159 for (int i = 0; i < count; i++) { 160 if (((colors[i] >> 24) & 0xff) < 255) { 161 hasAlpha = true; 162 break; 163 } 164 } 165 166 info.width = min(width, uint32_t(mMaxTextureSize)); 167 info.hasAlpha = hasAlpha; 168 } 169 170 Texture* GradientCache::addLinearGradient(GradientCacheEntry& gradient, 171 uint32_t* colors, float* positions, int count) { 172 173 GradientInfo info; 174 getGradientInfo(colors, count, info); 175 176 Texture* texture = new Texture(); 177 texture->width = info.width; 178 texture->height = 2; 179 texture->blend = info.hasAlpha; 180 texture->generation = 1; 181 182 // Asume the cache is always big enough 183 const uint32_t size = texture->width * texture->height * bytesPerPixel(); 184 while (getSize() + size > mMaxSize) { 185 mCache.removeOldest(); 186 } 187 188 generateTexture(colors, positions, texture); 189 190 mSize += size; 191 mCache.put(gradient, texture); 192 193 return texture; 194 } 195 196 size_t GradientCache::bytesPerPixel() const { 197 // We use 4 channels (RGBA) 198 return 4 * (mUseFloatTexture ? sizeof(float) : sizeof(uint8_t)); 199 } 200 201 void GradientCache::splitToBytes(uint32_t inColor, GradientColor& outColor) const { 202 outColor.r = (inColor >> 16) & 0xff; 203 outColor.g = (inColor >> 8) & 0xff; 204 outColor.b = (inColor >> 0) & 0xff; 205 outColor.a = (inColor >> 24) & 0xff; 206 } 207 208 void GradientCache::splitToFloats(uint32_t inColor, GradientColor& outColor) const { 209 outColor.r = ((inColor >> 16) & 0xff) / 255.0f; 210 outColor.g = ((inColor >> 8) & 0xff) / 255.0f; 211 outColor.b = ((inColor >> 0) & 0xff) / 255.0f; 212 outColor.a = ((inColor >> 24) & 0xff) / 255.0f; 213 } 214 215 void GradientCache::mixBytes(GradientColor& start, GradientColor& end, float amount, 216 uint8_t*& dst) const { 217 float oppAmount = 1.0f - amount; 218 const float alpha = start.a * oppAmount + end.a * amount; 219 const float a = alpha / 255.0f; 220 221 *dst++ = uint8_t(a * (start.r * oppAmount + end.r * amount)); 222 *dst++ = uint8_t(a * (start.g * oppAmount + end.g * amount)); 223 *dst++ = uint8_t(a * (start.b * oppAmount + end.b * amount)); 224 *dst++ = uint8_t(alpha); 225 } 226 227 void GradientCache::mixFloats(GradientColor& start, GradientColor& end, float amount, 228 uint8_t*& dst) const { 229 float oppAmount = 1.0f - amount; 230 const float a = start.a * oppAmount + end.a * amount; 231 232 float* d = (float*) dst; 233 *d++ = a * (start.r * oppAmount + end.r * amount); 234 *d++ = a * (start.g * oppAmount + end.g * amount); 235 *d++ = a * (start.b * oppAmount + end.b * amount); 236 *d++ = a; 237 238 dst += 4 * sizeof(float); 239 } 240 241 void GradientCache::generateTexture(uint32_t* colors, float* positions, Texture* texture) { 242 const uint32_t width = texture->width; 243 const GLsizei rowBytes = width * bytesPerPixel(); 244 uint8_t pixels[rowBytes * texture->height]; 245 246 static ChannelSplitter gSplitters[] = { 247 &android::uirenderer::GradientCache::splitToBytes, 248 &android::uirenderer::GradientCache::splitToFloats, 249 }; 250 ChannelSplitter split = gSplitters[mUseFloatTexture]; 251 252 static ChannelMixer gMixers[] = { 253 &android::uirenderer::GradientCache::mixBytes, 254 &android::uirenderer::GradientCache::mixFloats, 255 }; 256 ChannelMixer mix = gMixers[mUseFloatTexture]; 257 258 GradientColor start; 259 (this->*split)(colors[0], start); 260 261 GradientColor end; 262 (this->*split)(colors[1], end); 263 264 int currentPos = 1; 265 float startPos = positions[0]; 266 float distance = positions[1] - startPos; 267 268 uint8_t* dst = pixels; 269 for (uint32_t x = 0; x < width; x++) { 270 float pos = x / float(width - 1); 271 if (pos > positions[currentPos]) { 272 start = end; 273 startPos = positions[currentPos]; 274 275 currentPos++; 276 277 (this->*split)(colors[currentPos], end); 278 distance = positions[currentPos] - startPos; 279 } 280 281 float amount = (pos - startPos) / distance; 282 (this->*mix)(start, end, amount, dst); 283 } 284 285 memcpy(pixels + rowBytes, pixels, rowBytes); 286 287 glGenTextures(1, &texture->id); 288 Caches::getInstance().bindTexture(texture->id); 289 glPixelStorei(GL_UNPACK_ALIGNMENT, 4); 290 291 if (mUseFloatTexture) { 292 // We have to use GL_RGBA16F because GL_RGBA32F does not support filtering 293 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F, width, texture->height, 0, 294 GL_RGBA, GL_FLOAT, pixels); 295 } else { 296 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, texture->height, 0, 297 GL_RGBA, GL_UNSIGNED_BYTE, pixels); 298 } 299 300 texture->setFilter(GL_LINEAR); 301 texture->setWrap(GL_CLAMP_TO_EDGE); 302 } 303 304 }; // namespace uirenderer 305 }; // namespace android 306
