GradientCache.cpp revision fe48f65922d4a3cc4aefe058cee5acec51504a20 
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 <SkGradientShader.h>
23
24#include <utils/threads.h>
25
26#include "GradientCache.h"
27#include "Properties.h"
28
29namespace android {
30namespace uirenderer {
31
32///////////////////////////////////////////////////////////////////////////////
33// Constructors/destructor
34///////////////////////////////////////////////////////////////////////////////
35
36GradientCache::GradientCache():
37        mCache(GenerationCache<SkShader*, Texture*>::kUnlimitedCapacity),
38        mSize(0), mMaxSize(MB(DEFAULT_GRADIENT_CACHE_SIZE)) {
39    char property[PROPERTY_VALUE_MAX];
40    if (property_get(PROPERTY_GRADIENT_CACHE_SIZE, property, NULL) > 0) {
41        LOGD("  Setting gradient cache size to %sMB", property);
42        setMaxSize(MB(atof(property)));
43    } else {
44        LOGD("  Using default gradient cache size of %.2fMB", DEFAULT_GRADIENT_CACHE_SIZE);
45    }
46
47    mCache.setOnEntryRemovedListener(this);
48}
49
50GradientCache::GradientCache(uint32_t maxByteSize):
51        mCache(GenerationCache<SkShader*, Texture*>::kUnlimitedCapacity),
52        mSize(0), mMaxSize(maxByteSize) {
53    mCache.setOnEntryRemovedListener(this);
54}
55
56GradientCache::~GradientCache() {
57    mCache.clear();
58}
59
60///////////////////////////////////////////////////////////////////////////////
61// Size management
62///////////////////////////////////////////////////////////////////////////////
63
64uint32_t GradientCache::getSize() {
65    return mSize;
66}
67
68uint32_t GradientCache::getMaxSize() {
69    return mMaxSize;
70}
71
72void GradientCache::setMaxSize(uint32_t maxSize) {
73    mMaxSize = maxSize;
74    while (mSize > mMaxSize) {
75        mCache.removeOldest();
76    }
77}
78
79///////////////////////////////////////////////////////////////////////////////
80// Callbacks
81///////////////////////////////////////////////////////////////////////////////
82
83void GradientCache::operator()(SkShader*& shader, Texture*& texture) {
84    // Already locked here
85    if (shader) {
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(SkShader* shader) {
101    return mCache.get(shader);
102}
103
104void GradientCache::remove(SkShader* shader) {
105    mCache.remove(shader);
106}
107
108void GradientCache::removeDeferred(SkShader* shader) {
109    Mutex::Autolock _l(mLock);
110    mGarbage.push(shader);
111}
112
113void GradientCache::clearGarbage() {
114    Mutex::Autolock _l(mLock);
115    size_t count = mGarbage.size();
116    for (size_t i = 0; i < count; i++) {
117        mCache.remove(mGarbage.itemAt(i));
118    }
119    mGarbage.clear();
120}
121
122void GradientCache::clear() {
123    mCache.clear();
124}
125
126Texture* GradientCache::addLinearGradient(SkShader* shader, uint32_t* colors,
127        float* positions, int count, SkShader::TileMode tileMode) {
128    SkBitmap bitmap;
129    bitmap.setConfig(SkBitmap::kARGB_8888_Config, 1024, 1);
130    bitmap.allocPixels();
131    bitmap.eraseColor(0);
132
133    SkCanvas canvas(bitmap);
134
135    SkPoint points[2];
136    points[0].set(0.0f, 0.0f);
137    points[1].set(bitmap.width(), 0.0f);
138
139    SkShader* localShader = SkGradientShader::CreateLinear(points,
140            reinterpret_cast<const SkColor*>(colors), positions, count, tileMode);
141
142    SkPaint p;
143    p.setStyle(SkPaint::kStrokeAndFill_Style);
144    p.setShader(localShader)->unref();
145
146    canvas.drawRectCoords(0.0f, 0.0f, bitmap.width(), 1.0f, p);
147
148    // Asume the cache is always big enough
149    const uint32_t size = bitmap.rowBytes() * bitmap.height();
150    while (mSize + size > mMaxSize) {
151        mCache.removeOldest();
152    }
153
154    Texture* texture = new Texture;
155    generateTexture(&bitmap, texture);
156
157    mSize += size;
158    mCache.put(shader, texture);
159
160    return texture;
161}
162
163void GradientCache::generateTexture(SkBitmap* bitmap, Texture* texture) {
164    SkAutoLockPixels autoLock(*bitmap);
165    if (!bitmap->readyToDraw()) {
166        LOGE("Cannot generate texture from shader");
167        return;
168    }
169
170    texture->generation = bitmap->getGenerationID();
171    texture->width = bitmap->width();
172    texture->height = bitmap->height();
173
174    glGenTextures(1, &texture->id);
175
176    glBindTexture(GL_TEXTURE_2D, texture->id);
177    glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
178
179    texture->blend = !bitmap->isOpaque();
180    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bitmap->rowBytesAsPixels(), texture->height, 0,
181            GL_RGBA, GL_UNSIGNED_BYTE, bitmap->getPixels());
182
183    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
184    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
185
186    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
187    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
188}
189
190}; // namespace uirenderer
191}; // namespace android
192