AssetAtlas.cpp revision c6e2e8ff474ae44bab5b9eb665851118abd27b68 
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#include "Image.h"
22
23#include <GLES2/gl2ext.h>
24
25namespace android {
26namespace uirenderer {
27
28///////////////////////////////////////////////////////////////////////////////
29// Lifecycle
30///////////////////////////////////////////////////////////////////////////////
31
32void AssetAtlas::init(sp<GraphicBuffer> buffer, int64_t* map, int count) {
33    if (mImage) {
34        return;
35    }
36
37    ATRACE_NAME("AssetAtlas::init");
38
39    mImage = new Image(buffer);
40    if (mImage->getTexture()) {
41        if (!mTexture) {
42            Caches& caches = Caches::getInstance();
43            mTexture = new Texture(caches);
44            mTexture->width = buffer->getWidth();
45            mTexture->height = buffer->getHeight();
46            createEntries(caches, map, count);
47        }
48    } else {
49        ALOGW("Could not create atlas image");
50        delete mImage;
51        mImage = nullptr;
52    }
53
54    updateTextureId();
55}
56
57void AssetAtlas::terminate() {
58    if (mImage) {
59        delete mImage;
60        mImage = nullptr;
61        updateTextureId();
62    }
63}
64
65
66void AssetAtlas::updateTextureId() {
67    mTexture->id = mImage ? mImage->getTexture() : 0;
68    if (mTexture->id) {
69        // Texture ID changed, force-set to defaults to sync the wrapper & GL
70        // state objects
71        mTexture->setWrap(GL_CLAMP_TO_EDGE, false, true);
72        mTexture->setFilter(GL_NEAREST, false, true);
73    }
74    for (size_t i = 0; i < mEntries.size(); i++) {
75        AssetAtlas::Entry* entry = mEntries.valueAt(i);
76        entry->texture->id = mTexture->id;
77    }
78}
79
80///////////////////////////////////////////////////////////////////////////////
81// Entries
82///////////////////////////////////////////////////////////////////////////////
83
84AssetAtlas::Entry* AssetAtlas::getEntry(const SkBitmap* bitmap) const {
85    ssize_t index = mEntries.indexOfKey(bitmap->pixelRef());
86    return index >= 0 ? mEntries.valueAt(index) : nullptr;
87}
88
89Texture* AssetAtlas::getEntryTexture(const SkBitmap* bitmap) const {
90    ssize_t index = mEntries.indexOfKey(bitmap->pixelRef());
91    return index >= 0 ? mEntries.valueAt(index)->texture : nullptr;
92}
93
94/**
95 * Delegates changes to wrapping and filtering to the base atlas texture
96 * instead of applying the changes to the virtual textures.
97 */
98struct DelegateTexture: public Texture {
99    DelegateTexture(Caches& caches, Texture* delegate): Texture(caches), mDelegate(delegate) { }
100
101    virtual void setWrapST(GLenum wrapS, GLenum wrapT, bool bindTexture = false,
102            bool force = false, GLenum renderTarget = GL_TEXTURE_2D) override {
103        mDelegate->setWrapST(wrapS, wrapT, bindTexture, force, renderTarget);
104    }
105
106    virtual void setFilterMinMag(GLenum min, GLenum mag, bool bindTexture = false,
107            bool force = false, GLenum renderTarget = GL_TEXTURE_2D) override {
108        mDelegate->setFilterMinMag(min, mag, bindTexture, force, renderTarget);
109    }
110
111private:
112    Texture* const mDelegate;
113}; // struct DelegateTexture
114
115/**
116 * TODO: This method does not take the rotation flag into account
117 */
118void AssetAtlas::createEntries(Caches& caches, int64_t* map, int count) {
119    const float width = float(mTexture->width);
120    const float height = float(mTexture->height);
121
122    for (int i = 0; i < count; ) {
123        SkPixelRef* pixelRef = reinterpret_cast<SkPixelRef*>(map[i++]);
124        // NOTE: We're converting from 64 bit signed values to 32 bit
125        // signed values. This is guaranteed to be safe because the "x"
126        // and "y" coordinate values are guaranteed to be representable
127        // with 32 bits. The array is 64 bits wide so that it can carry
128        // pointers on 64 bit architectures.
129        const int x = static_cast<int>(map[i++]);
130        const int y = static_cast<int>(map[i++]);
131        bool rotated = map[i++] > 0;
132
133        // Bitmaps should never be null, we're just extra paranoid
134        if (!pixelRef) continue;
135
136        const UvMapper mapper(
137                x / width, (x + pixelRef->info().width()) / width,
138                y / height, (y + pixelRef->info().height()) / height);
139
140        Texture* texture = new DelegateTexture(caches, mTexture);
141        texture->blend = !SkAlphaTypeIsOpaque(pixelRef->info().alphaType());
142        texture->width = pixelRef->info().width();
143        texture->height = pixelRef->info().height();
144
145        Entry* entry = new Entry(pixelRef, x, y, rotated, texture, mapper, *this);
146        texture->uvMapper = &entry->uvMapper;
147
148        mEntries.add(entry->pixelRef, entry);
149    }
150}
151
152}; // namespace uirenderer
153}; // namespace android
154