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#include "Caches.h"
21
22#include <GLES2/gl2ext.h>
23
24namespace android {
25namespace uirenderer {
26
27///////////////////////////////////////////////////////////////////////////////
28// Lifecycle
29///////////////////////////////////////////////////////////////////////////////
30
31void AssetAtlas::init(sp<GraphicBuffer> buffer, int64_t* map, int count) {
32    if (mImage) {
33        return;
34    }
35
36    ATRACE_NAME("AssetAtlas::init");
37
38    mImage = new Image(buffer);
39    if (mImage->getTexture()) {
40        if (!mTexture) {
41            Caches& caches = Caches::getInstance();
42            mTexture = new Texture(caches);
43            mTexture->width = buffer->getWidth();
44            mTexture->height = buffer->getHeight();
45            createEntries(caches, map, count);
46        }
47    } else {
48        ALOGW("Could not create atlas image");
49        delete mImage;
50        mImage = NULL;
51    }
52
53    updateTextureId();
54}
55
56void AssetAtlas::terminate() {
57    if (mImage) {
58        delete mImage;
59        mImage = NULL;
60        updateTextureId();
61    }
62}
63
64
65void AssetAtlas::updateTextureId() {
66    mTexture->id = mImage ? mImage->getTexture() : 0;
67    if (mTexture->id) {
68        // Texture ID changed, force-set to defaults to sync the wrapper & GL
69        // state objects
70        mTexture->setWrap(GL_CLAMP_TO_EDGE, false, true);
71        mTexture->setFilter(GL_NEAREST, false, true);
72    }
73    for (size_t i = 0; i < mEntries.size(); i++) {
74        AssetAtlas::Entry* entry = mEntries.valueAt(i);
75        entry->texture->id = mTexture->id;
76    }
77}
78
79///////////////////////////////////////////////////////////////////////////////
80// Entries
81///////////////////////////////////////////////////////////////////////////////
82
83AssetAtlas::Entry* AssetAtlas::getEntry(const SkBitmap* bitmap) const {
84    ssize_t index = mEntries.indexOfKey(bitmap);
85    return index >= 0 ? mEntries.valueAt(index) : NULL;
86}
87
88Texture* AssetAtlas::getEntryTexture(const SkBitmap* bitmap) const {
89    ssize_t index = mEntries.indexOfKey(bitmap);
90    return index >= 0 ? mEntries.valueAt(index)->texture : NULL;
91}
92
93/**
94 * Delegates changes to wrapping and filtering to the base atlas texture
95 * instead of applying the changes to the virtual textures.
96 */
97struct DelegateTexture: public Texture {
98    DelegateTexture(Caches& caches, Texture* delegate): Texture(caches), mDelegate(delegate) { }
99
100    virtual void setWrapST(GLenum wrapS, GLenum wrapT, bool bindTexture = false,
101            bool force = false, GLenum renderTarget = GL_TEXTURE_2D) {
102        mDelegate->setWrapST(wrapS, wrapT, bindTexture, force, renderTarget);
103    }
104
105    virtual void setFilterMinMag(GLenum min, GLenum mag, bool bindTexture = false,
106            bool force = false, GLenum renderTarget = GL_TEXTURE_2D) {
107        mDelegate->setFilterMinMag(min, mag, bindTexture, force, renderTarget);
108    }
109
110private:
111    Texture* const mDelegate;
112}; // struct DelegateTexture
113
114/**
115 * TODO: This method does not take the rotation flag into account
116 */
117void AssetAtlas::createEntries(Caches& caches, int64_t* map, int count) {
118    const float width = float(mTexture->width);
119    const float height = float(mTexture->height);
120
121    for (int i = 0; i < count; ) {
122        SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(map[i++]);
123        // NOTE: We're converting from 64 bit signed values to 32 bit
124        // signed values. This is guaranteed to be safe because the "x"
125        // and "y" coordinate values are guaranteed to be representable
126        // with 32 bits. The array is 64 bits wide so that it can carry
127        // pointers on 64 bit architectures.
128        const int x = static_cast<int>(map[i++]);
129        const int y = static_cast<int>(map[i++]);
130        bool rotated = map[i++] > 0;
131
132        // Bitmaps should never be null, we're just extra paranoid
133        if (!bitmap) continue;
134
135        const UvMapper mapper(
136                x / width, (x + bitmap->width()) / width,
137                y / height, (y + bitmap->height()) / height);
138
139        Texture* texture = new DelegateTexture(caches, mTexture);
140        texture->blend = !bitmap->isOpaque();
141        texture->width = bitmap->width();
142        texture->height = bitmap->height();
143
144        Entry* entry = new Entry(bitmap, x, y, rotated, texture, mapper, *this);
145        texture->uvMapper = &entry->uvMapper;
146
147        mEntries.add(entry->bitmap, entry);
148    }
149}
150
151}; // namespace uirenderer
152}; // namespace android
153