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 #include <utils/JenkinsHash.h>
18
19 #include "Caches.h"
20 #include "Debug.h"
21 #include "GradientCache.h"
22 #include "Properties.h"
23
24 #include <cutils/properties.h>
25
26 namespace android {
27 namespace uirenderer {
28
29 ///////////////////////////////////////////////////////////////////////////////
30 // Functions
31 ///////////////////////////////////////////////////////////////////////////////
32
33 template<typename T>
min(T a,T b)34 static inline T min(T a, T b) {
35 return a < b ? a : b;
36 }
37
38 ///////////////////////////////////////////////////////////////////////////////
39 // Cache entry
40 ///////////////////////////////////////////////////////////////////////////////
41
hash() const42 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
compare(const GradientCacheEntry & lhs,const GradientCacheEntry & rhs)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.get(), rhs.colors.get(), lhs.count * sizeof(uint32_t));
56 if (deltaInt != 0) return deltaInt;
57
58 return memcmp(lhs.positions.get(), rhs.positions.get(), lhs.count * sizeof(float));
59 }
60
61 ///////////////////////////////////////////////////////////////////////////////
62 // Constructors/destructor
63 ///////////////////////////////////////////////////////////////////////////////
64
GradientCache(Extensions & extensions)65 GradientCache::GradientCache(Extensions& extensions)
66 : mCache(LruCache<GradientCacheEntry, Texture*>::kUnlimitedCapacity)
67 , mSize(0)
68 , mMaxSize(Properties::gradientCacheSize)
69 , mUseFloatTexture(extensions.hasFloatTextures())
70 , mHasNpot(extensions.hasNPot())
71 , mHasLinearBlending(extensions.hasLinearBlending()) {
72 glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
73
74 mCache.setOnEntryRemovedListener(this);
75 }
76
~GradientCache()77 GradientCache::~GradientCache() {
78 mCache.clear();
79 }
80
81 ///////////////////////////////////////////////////////////////////////////////
82 // Size management
83 ///////////////////////////////////////////////////////////////////////////////
84
getSize()85 uint32_t GradientCache::getSize() {
86 return mSize;
87 }
88
getMaxSize()89 uint32_t GradientCache::getMaxSize() {
90 return mMaxSize;
91 }
92
93 ///////////////////////////////////////////////////////////////////////////////
94 // Callbacks
95 ///////////////////////////////////////////////////////////////////////////////
96
operator ()(GradientCacheEntry &,Texture * & texture)97 void GradientCache::operator()(GradientCacheEntry&, Texture*& texture) {
98 if (texture) {
99 mSize -= texture->objectSize();
100 texture->deleteTexture();
101 delete texture;
102 }
103 }
104
105 ///////////////////////////////////////////////////////////////////////////////
106 // Caching
107 ///////////////////////////////////////////////////////////////////////////////
108
get(uint32_t * colors,float * positions,int count)109 Texture* GradientCache::get(uint32_t* colors, float* positions, int count) {
110 GradientCacheEntry gradient(colors, positions, count);
111 Texture* texture = mCache.get(gradient);
112
113 if (!texture) {
114 texture = addLinearGradient(gradient, colors, positions, count);
115 }
116
117 return texture;
118 }
119
clear()120 void GradientCache::clear() {
121 mCache.clear();
122 }
123
getGradientInfo(const uint32_t * colors,const int count,GradientInfo & info)124 void GradientCache::getGradientInfo(const uint32_t* colors, const int count,
125 GradientInfo& info) {
126 uint32_t width = 256 * (count - 1);
127
128 // If the npot extension is not supported we cannot use non-clamp
129 // wrap modes. We therefore find the nearest largest power of 2
130 // unless width is already a power of 2
131 if (!mHasNpot && (width & (width - 1)) != 0) {
132 width = 1 << (32 - __builtin_clz(width));
133 }
134
135 bool hasAlpha = false;
136 for (int i = 0; i < count; i++) {
137 if (((colors[i] >> 24) & 0xff) < 255) {
138 hasAlpha = true;
139 break;
140 }
141 }
142
143 info.width = min(width, uint32_t(mMaxTextureSize));
144 info.hasAlpha = hasAlpha;
145 }
146
addLinearGradient(GradientCacheEntry & gradient,uint32_t * colors,float * positions,int count)147 Texture* GradientCache::addLinearGradient(GradientCacheEntry& gradient,
148 uint32_t* colors, float* positions, int count) {
149
150 GradientInfo info;
151 getGradientInfo(colors, count, info);
152
153 Texture* texture = new Texture(Caches::getInstance());
154 texture->blend = info.hasAlpha;
155 texture->generation = 1;
156
157 // Assume the cache is always big enough
158 const uint32_t size = info.width * 2 * bytesPerPixel();
159 while (getSize() + size > mMaxSize) {
160 LOG_ALWAYS_FATAL_IF(!mCache.removeOldest(),
161 "Ran out of things to remove from the cache? getSize() = %" PRIu32
162 ", size = %" PRIu32 ", mMaxSize = %" PRIu32 ", width = %" PRIu32,
163 getSize(), size, mMaxSize, info.width);
164 }
165
166 generateTexture(colors, positions, info.width, 2, texture);
167
168 mSize += size;
169 LOG_ALWAYS_FATAL_IF((int)size != texture->objectSize(),
170 "size != texture->objectSize(), size %" PRIu32 ", objectSize %d"
171 " width = %" PRIu32 " bytesPerPixel() = %zu",
172 size, texture->objectSize(), info.width, bytesPerPixel());
173 mCache.put(gradient, texture);
174
175 return texture;
176 }
177
bytesPerPixel() const178 size_t GradientCache::bytesPerPixel() const {
179 // We use 4 channels (RGBA)
180 return 4 * (mUseFloatTexture ? /* fp16 */ 2 : sizeof(uint8_t));
181 }
182
sourceBytesPerPixel() const183 size_t GradientCache::sourceBytesPerPixel() const {
184 // We use 4 channels (RGBA) and upload from floats (not half floats)
185 return 4 * (mUseFloatTexture ? sizeof(float) : sizeof(uint8_t));
186 }
187
mixBytes(const FloatColor & start,const FloatColor & end,float amount,uint8_t * & dst) const188 void GradientCache::mixBytes(const FloatColor& start, const FloatColor& end,
189 float amount, uint8_t*& dst) const {
190 float oppAmount = 1.0f - amount;
191 float a = start.a * oppAmount + end.a * amount;
192 *dst++ = uint8_t(OECF(start.r * oppAmount + end.r * amount) * 255.0f);
193 *dst++ = uint8_t(OECF(start.g * oppAmount + end.g * amount) * 255.0f);
194 *dst++ = uint8_t(OECF(start.b * oppAmount + end.b * amount) * 255.0f);
195 *dst++ = uint8_t(a * 255.0f);
196 }
197
mixFloats(const FloatColor & start,const FloatColor & end,float amount,uint8_t * & dst) const198 void GradientCache::mixFloats(const FloatColor& start, const FloatColor& end,
199 float amount, uint8_t*& dst) const {
200 float oppAmount = 1.0f - amount;
201 float a = start.a * oppAmount + end.a * amount;
202 float* d = (float*) dst;
203 #ifdef ANDROID_ENABLE_LINEAR_BLENDING
204 // We want to stay linear
205 *d++ = (start.r * oppAmount + end.r * amount);
206 *d++ = (start.g * oppAmount + end.g * amount);
207 *d++ = (start.b * oppAmount + end.b * amount);
208 #else
209 *d++ = OECF(start.r * oppAmount + end.r * amount);
210 *d++ = OECF(start.g * oppAmount + end.g * amount);
211 *d++ = OECF(start.b * oppAmount + end.b * amount);
212 #endif
213 *d++ = a;
214 dst += 4 * sizeof(float);
215 }
216
generateTexture(uint32_t * colors,float * positions,const uint32_t width,const uint32_t height,Texture * texture)217 void GradientCache::generateTexture(uint32_t* colors, float* positions,
218 const uint32_t width, const uint32_t height, Texture* texture) {
219 const GLsizei rowBytes = width * sourceBytesPerPixel();
220 uint8_t pixels[rowBytes * height];
221
222 static ChannelMixer gMixers[] = {
223 // colors are stored gamma-encoded
224 &android::uirenderer::GradientCache::mixBytes,
225 // colors are stored in linear (linear blending on)
226 // or gamma-encoded (linear blending off)
227 &android::uirenderer::GradientCache::mixFloats,
228 };
229 ChannelMixer mix = gMixers[mUseFloatTexture];
230
231 FloatColor start;
232 start.set(colors[0]);
233
234 FloatColor end;
235 end.set(colors[1]);
236
237 int currentPos = 1;
238 float startPos = positions[0];
239 float distance = positions[1] - startPos;
240
241 uint8_t* dst = pixels;
242 for (uint32_t x = 0; x < width; x++) {
243 float pos = x / float(width - 1);
244 if (pos > positions[currentPos]) {
245 start = end;
246 startPos = positions[currentPos];
247
248 currentPos++;
249
250 end.set(colors[currentPos]);
251 distance = positions[currentPos] - startPos;
252 }
253
254 float amount = (pos - startPos) / distance;
255 (this->*mix)(start, end, amount, dst);
256 }
257
258 memcpy(pixels + rowBytes, pixels, rowBytes);
259
260 if (mUseFloatTexture) {
261 texture->upload(GL_RGBA16F, width, height, GL_RGBA, GL_FLOAT, pixels);
262 } else {
263 GLint internalFormat = mHasLinearBlending ? GL_SRGB8_ALPHA8 : GL_RGBA;
264 texture->upload(internalFormat, width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
265 }
266
267 texture->setFilter(GL_LINEAR);
268 texture->setWrap(GL_CLAMP_TO_EDGE);
269 }
270
271 }; // namespace uirenderer
272 }; // namespace android
273