GradientCache.cpp revision c9855a53edfac818dc68714557185977556f849d 
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 "Debug.h"
27#include "GradientCache.h"
28#include "Properties.h"
29
30namespace android {
31namespace uirenderer {
32
33///////////////////////////////////////////////////////////////////////////////
34// Constructors/destructor
35///////////////////////////////////////////////////////////////////////////////
36
37GradientCache::GradientCache():
38        mCache(GenerationCache<SkShader*, Texture*>::kUnlimitedCapacity),
39        mSize(0), mMaxSize(MB(DEFAULT_GRADIENT_CACHE_SIZE)) {
40    char property[PROPERTY_VALUE_MAX];
41    if (property_get(PROPERTY_GRADIENT_CACHE_SIZE, property, NULL) > 0) {
42        INIT_LOGD("  Setting gradient cache size to %sMB", property);
43        setMaxSize(MB(atof(property)));
44    } else {
45        INIT_LOGD("  Using default gradient cache size of %.2fMB", DEFAULT_GRADIENT_CACHE_SIZE);
46    }
47
48    mCache.setOnEntryRemovedListener(this);
49}
50
51GradientCache::GradientCache(uint32_t maxByteSize):
52        mCache(GenerationCache<SkShader*, 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()(SkShader*& shader, Texture*& texture) {
85    // Already locked here
86    if (shader) {
87        const uint32_t size = texture->width * texture->height * 4;
88        mSize -= size;
89    }
90
91    if (texture) {
92        glDeleteTextures(1, &texture->id);
93        delete texture;
94    }
95}
96
97///////////////////////////////////////////////////////////////////////////////
98// Caching
99///////////////////////////////////////////////////////////////////////////////
100
101Texture* GradientCache::get(SkShader* shader) {
102    return mCache.get(shader);
103}
104
105void GradientCache::remove(SkShader* shader) {
106    mCache.remove(shader);
107}
108
109void GradientCache::removeDeferred(SkShader* shader) {
110    Mutex::Autolock _l(mLock);
111    mGarbage.push(shader);
112}
113
114void GradientCache::clearGarbage() {
115    Mutex::Autolock _l(mLock);
116    size_t count = mGarbage.size();
117    for (size_t i = 0; i < count; i++) {
118        mCache.remove(mGarbage.itemAt(i));
119    }
120    mGarbage.clear();
121}
122
123void GradientCache::clear() {
124    mCache.clear();
125}
126
127Texture* GradientCache::addLinearGradient(SkShader* shader, uint32_t* colors,
128        float* positions, int count, SkShader::TileMode tileMode) {
129    SkBitmap bitmap;
130    bitmap.setConfig(SkBitmap::kARGB_8888_Config, 1024, 1);
131    bitmap.allocPixels();
132    bitmap.eraseColor(0);
133
134    SkCanvas canvas(bitmap);
135
136    SkPoint points[2];
137    points[0].set(0.0f, 0.0f);
138    points[1].set(bitmap.width(), 0.0f);
139
140    SkShader* localShader = SkGradientShader::CreateLinear(points,
141            reinterpret_cast<const SkColor*>(colors), positions, count, tileMode);
142
143    SkPaint p;
144    p.setStyle(SkPaint::kStrokeAndFill_Style);
145    p.setShader(localShader)->unref();
146
147    canvas.drawRectCoords(0.0f, 0.0f, bitmap.width(), 1.0f, p);
148
149    // Asume the cache is always big enough
150    const uint32_t size = bitmap.rowBytes() * bitmap.height();
151    while (mSize + size > mMaxSize) {
152        mCache.removeOldest();
153    }
154
155    Texture* texture = new Texture;
156    generateTexture(&bitmap, texture);
157
158    mSize += size;
159    mCache.put(shader, texture);
160
161    return texture;
162}
163
164void GradientCache::generateTexture(SkBitmap* bitmap, Texture* texture) {
165    SkAutoLockPixels autoLock(*bitmap);
166    if (!bitmap->readyToDraw()) {
167        LOGE("Cannot generate texture from shader");
168        return;
169    }
170
171    texture->generation = bitmap->getGenerationID();
172    texture->width = bitmap->width();
173    texture->height = bitmap->height();
174
175    glGenTextures(1, &texture->id);
176
177    glBindTexture(GL_TEXTURE_2D, texture->id);
178    glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
179
180    texture->blend = !bitmap->isOpaque();
181    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bitmap->rowBytesAsPixels(), texture->height, 0,
182            GL_RGBA, GL_UNSIGNED_BYTE, bitmap->getPixels());
183
184    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
185    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
186
187    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
188    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
189}
190
191}; // namespace uirenderer
192}; // namespace android
193