GradientCache.cpp revision fb8b763f762ae21923c58d64caa729b012f40e05 
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 "GradientCache.h"
25#include "Properties.h"
26
27namespace android {
28namespace uirenderer {
29
30///////////////////////////////////////////////////////////////////////////////
31// Constructors/destructor
32///////////////////////////////////////////////////////////////////////////////
33
34GradientCache::GradientCache():
35        mCache(GenerationCache<SkShader*, Texture*>::kUnlimitedCapacity),
36        mSize(0), mMaxSize(MB(DEFAULT_GRADIENT_CACHE_SIZE)) {
37    char property[PROPERTY_VALUE_MAX];
38    if (property_get(PROPERTY_GRADIENT_CACHE_SIZE, property, NULL) > 0) {
39        LOGD("  Setting gradient cache size to %sMB", property);
40        setMaxSize(MB(atof(property)));
41    } else {
42        LOGD("  Using default gradient cache size of %.2fMB", DEFAULT_GRADIENT_CACHE_SIZE);
43    }
44
45    mCache.setOnEntryRemovedListener(this);
46}
47
48GradientCache::GradientCache(uint32_t maxByteSize):
49        mCache(GenerationCache<SkShader*, Texture*>::kUnlimitedCapacity),
50        mSize(0), mMaxSize(maxByteSize) {
51    mCache.setOnEntryRemovedListener(this);
52}
53
54GradientCache::~GradientCache() {
55    mCache.clear();
56}
57
58///////////////////////////////////////////////////////////////////////////////
59// Size management
60///////////////////////////////////////////////////////////////////////////////
61
62uint32_t GradientCache::getSize() {
63    return mSize;
64}
65
66uint32_t GradientCache::getMaxSize() {
67    return mMaxSize;
68}
69
70void GradientCache::setMaxSize(uint32_t maxSize) {
71    mMaxSize = maxSize;
72    while (mSize > mMaxSize) {
73        mCache.removeOldest();
74    }
75}
76
77///////////////////////////////////////////////////////////////////////////////
78// Callbacks
79///////////////////////////////////////////////////////////////////////////////
80
81void GradientCache::operator()(SkShader*& shader, Texture*& texture) {
82    if (shader) {
83        const uint32_t size = texture->width * texture->height * 4;
84        mSize -= size;
85    }
86
87    if (texture) {
88        glDeleteTextures(1, &texture->id);
89        delete texture;
90    }
91}
92
93///////////////////////////////////////////////////////////////////////////////
94// Caching
95///////////////////////////////////////////////////////////////////////////////
96
97Texture* GradientCache::get(SkShader* shader) {
98    return mCache.get(shader);
99}
100
101void GradientCache::remove(SkShader* shader) {
102    mCache.remove(shader);
103}
104
105void GradientCache::clear() {
106    mCache.clear();
107}
108
109Texture* GradientCache::addLinearGradient(SkShader* shader, float* bounds, uint32_t* colors,
110        float* positions, int count, SkShader::TileMode tileMode) {
111    SkBitmap bitmap;
112    bitmap.setConfig(SkBitmap::kARGB_8888_Config, 1024, 1);
113    bitmap.allocPixels();
114    bitmap.eraseColor(0);
115
116    SkCanvas canvas(bitmap);
117
118    SkPoint points[2];
119    points[0].set(0.0f, 0.0f);
120    points[1].set(bitmap.width(), 0.0f);
121
122    SkShader* localShader = SkGradientShader::CreateLinear(points,
123            reinterpret_cast<const SkColor*>(colors), positions, count, tileMode);
124
125    SkPaint p;
126    p.setStyle(SkPaint::kStrokeAndFill_Style);
127    p.setShader(localShader)->unref();
128
129    canvas.drawRectCoords(0.0f, 0.0f, bitmap.width(), 1.0f, p);
130
131    // Asume the cache is always big enough
132    const uint32_t size = bitmap.rowBytes() * bitmap.height();
133    while (mSize + size > mMaxSize) {
134        mCache.removeOldest();
135    }
136
137    Texture* texture = new Texture;
138    generateTexture(&bitmap, texture);
139
140    mSize += size;
141    mCache.put(shader, texture);
142
143    return texture;
144}
145
146void GradientCache::generateTexture(SkBitmap* bitmap, Texture* texture) {
147    SkAutoLockPixels autoLock(*bitmap);
148    if (!bitmap->readyToDraw()) {
149        LOGE("Cannot generate texture from shader");
150        return;
151    }
152
153    texture->generation = bitmap->getGenerationID();
154    texture->width = bitmap->width();
155    texture->height = bitmap->height();
156
157    glGenTextures(1, &texture->id);
158
159    glBindTexture(GL_TEXTURE_2D, texture->id);
160    glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
161
162    texture->blend = !bitmap->isOpaque();
163    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bitmap->rowBytesAsPixels(), texture->height, 0,
164            GL_RGBA, GL_UNSIGNED_BYTE, bitmap->getPixels());
165
166    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
167    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
168
169    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
170    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
171}
172
173}; // namespace uirenderer
174}; // namespace android
175