TextureCache.cpp revision c1396e93b6a5286a5183c00c781b62e940a12c1f 
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 <GLES2/gl2.h>
18
19#include "TextureCache.h"
20
21namespace android {
22namespace uirenderer {
23
24TextureCache::TextureCache(unsigned int maxEntries): mCache(maxEntries) {
25    mCache.setOnEntryRemovedListener(this);
26}
27
28TextureCache::~TextureCache() {
29    mCache.clear();
30}
31
32void TextureCache::operator()(SkBitmap* key, Texture* value) {
33    LOGD("Entry removed");
34    if (value) {
35        glDeleteTextures(1, &value->id);
36        delete value;
37    }
38}
39
40Texture* TextureCache::get(SkBitmap* bitmap) {
41    Texture* texture = mCache.get(bitmap);
42    if (!texture) {
43        texture = new Texture;
44        generateTexture(bitmap, texture, false);
45        mCache.put(bitmap, texture);
46    } else if (bitmap->getGenerationID() != texture->generation) {
47        generateTexture(bitmap, texture, true);
48    }
49    return texture;
50}
51
52Texture* TextureCache::remove(SkBitmap* bitmap) {
53    return mCache.remove(bitmap);
54}
55
56void TextureCache::clear() {
57    mCache.clear();
58}
59
60void TextureCache::generateTexture(SkBitmap* bitmap, Texture* texture, bool regenerate) {
61    SkAutoLockPixels alp(*bitmap);
62    if (!bitmap->readyToDraw()) {
63        LOGE("Cannot generate texture from bitmap");
64        return;
65    }
66
67    if (!regenerate) {
68        texture->generation = bitmap->getGenerationID();
69        texture->width = bitmap->width();
70        texture->height = bitmap->height();
71
72        glGenTextures(1, &texture->id);
73    }
74
75    glBindTexture(GL_TEXTURE_2D, texture->id);
76    glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
77
78    switch (bitmap->getConfig()) {
79    case SkBitmap::kRGB_565_Config:
80        texture->blend = false;
81        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, bitmap->rowBytesAsPixels(), texture->height, 0,
82                GL_RGB, GL_UNSIGNED_SHORT_5_6_5, bitmap->getPixels());
83        break;
84    case SkBitmap::kARGB_8888_Config:
85        texture->blend = true;
86        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bitmap->rowBytesAsPixels(), texture->height, 0,
87                GL_RGBA, GL_UNSIGNED_BYTE, bitmap->getPixels());
88        break;
89    default:
90        break;
91    }
92
93    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
94    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
95    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
96    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
97
98    glBindTexture(GL_TEXTURE_2D, 0);
99}
100
101}; // namespace uirenderer
102}; // namespace android
103