AssetAtlas.cpp revision 3b748a44c6bd2ea05fe16839caf73dbe50bd7ae9 
1/*
2 * Copyright (C) 2013 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 "AssetAtlas.h"
20
21#include <GLES2/gl2ext.h>
22
23#include <utils/Log.h>
24
25namespace android {
26namespace uirenderer {
27
28///////////////////////////////////////////////////////////////////////////////
29// Lifecycle
30///////////////////////////////////////////////////////////////////////////////
31
32void AssetAtlas::init(sp<GraphicBuffer> buffer, int* map, int count) {
33    if (mImage != EGL_NO_IMAGE_KHR) {
34        return;
35    }
36
37    // Create the EGLImage object that maps the GraphicBuffer
38    EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
39    EGLClientBuffer clientBuffer = (EGLClientBuffer) buffer->getNativeBuffer();
40    EGLint attrs[] = { EGL_IMAGE_PRESERVED_KHR, EGL_TRUE, EGL_NONE };
41
42    mImage = eglCreateImageKHR(display, EGL_NO_CONTEXT,
43            EGL_NATIVE_BUFFER_ANDROID, clientBuffer, attrs);
44
45    if (mImage == EGL_NO_IMAGE_KHR) {
46        ALOGW("Error creating atlas image (%#x)", eglGetError());
47        return;
48    }
49
50    // Create a 2D texture to sample from the EGLImage
51    glGenTextures(1, &mTexture);
52    glBindTexture(GL_TEXTURE_2D, mTexture);
53    glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, mImage);
54
55    mWidth = buffer->getWidth();
56    mHeight = buffer->getHeight();
57
58    createEntries(map, count);
59}
60
61void AssetAtlas::terminate() {
62    if (mImage != EGL_NO_IMAGE_KHR) {
63        eglDestroyImageKHR(eglGetDisplay(EGL_DEFAULT_DISPLAY), mImage);
64        mImage = EGL_NO_IMAGE_KHR;
65
66        glDeleteTextures(1, &mTexture);
67        mTexture = 0;
68
69        for (size_t i = 0; i < mEntries.size(); i++) {
70            delete mEntries.valueAt(i);
71        }
72        mEntries.clear();
73
74        mWidth = mHeight = 0;
75    }
76}
77
78///////////////////////////////////////////////////////////////////////////////
79// Entries
80///////////////////////////////////////////////////////////////////////////////
81
82AssetAtlas::Entry* AssetAtlas::getEntry(SkBitmap* const bitmap) const {
83    ssize_t index = mEntries.indexOfKey(bitmap);
84    return index >= 0 ? mEntries.valueAt(index) : NULL;
85}
86
87Texture* AssetAtlas::getEntryTexture(SkBitmap* const bitmap) const {
88    ssize_t index = mEntries.indexOfKey(bitmap);
89    return index >= 0 ? &mEntries.valueAt(index)->texture : NULL;
90}
91
92/**
93 * TODO: This method does not take the rotation flag into account
94 */
95void AssetAtlas::createEntries(int* map, int count) {
96    for (int i = 0; i < count; ) {
97        SkBitmap* bitmap = (SkBitmap*) map[i++];
98        int x = map[i++];
99        int y = map[i++];
100        bool rotated = map[i++] > 0;
101
102        // Bitmaps should never be null, we're just extra paranoid
103        if (!bitmap) continue;
104
105        const UvMapper mapper(
106                x / (float) mWidth, (x + bitmap->width()) / (float) mWidth,
107                y / (float) mHeight, (y + bitmap->height()) / (float) mHeight);
108
109        Entry* entry = new Entry(bitmap, x, y, rotated, mapper, *this);
110        entry->texture.id = mTexture;
111        entry->texture.blend = !bitmap->isOpaque();
112        entry->texture.width = bitmap->width();
113        entry->texture.height = bitmap->height();
114        entry->texture.uvMapper = &entry->uvMapper;
115
116        mEntries.add(entry->bitmap, entry);
117    }
118}
119
120}; // namespace uirenderer
121}; // namespace android
122