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#include "AssetAtlas.h"
18#include "Caches.h"
19#include "Image.h"
20
21#include <GLES2/gl2ext.h>
22
23namespace android {
24namespace uirenderer {
25
26///////////////////////////////////////////////////////////////////////////////
27// Lifecycle
28///////////////////////////////////////////////////////////////////////////////
29
30void AssetAtlas::init(sp<GraphicBuffer> buffer, int64_t* map, int count) {
31    if (mImage) {
32        return;
33    }
34
35    ATRACE_NAME("AssetAtlas::init");
36
37    mImage = new Image(buffer);
38    if (mImage->getTexture()) {
39        if (!mTexture) {
40            Caches& caches = Caches::getInstance();
41            mTexture = new Texture(caches);
42            mTexture->wrap(mImage->getTexture(),
43                    buffer->getWidth(), buffer->getHeight(), GL_RGBA);
44            createEntries(caches, map, count);
45        }
46    } else {
47        ALOGW("Could not create atlas image");
48        terminate();
49    }
50}
51
52void AssetAtlas::terminate() {
53    delete mImage;
54    mImage = nullptr;
55    delete mTexture;
56    mTexture = nullptr;
57    mEntries.clear();
58}
59
60///////////////////////////////////////////////////////////////////////////////
61// Entries
62///////////////////////////////////////////////////////////////////////////////
63
64AssetAtlas::Entry* AssetAtlas::getEntry(const SkPixelRef* pixelRef) const {
65    auto result = mEntries.find(pixelRef);
66    return result != mEntries.end() ? result->second.get() : nullptr;
67}
68
69Texture* AssetAtlas::getEntryTexture(const SkPixelRef* pixelRef) const {
70    auto result = mEntries.find(pixelRef);
71    return result != mEntries.end() ? result->second->texture : nullptr;
72}
73
74/**
75 * Delegates changes to wrapping and filtering to the base atlas texture
76 * instead of applying the changes to the virtual textures.
77 */
78struct DelegateTexture: public Texture {
79    DelegateTexture(Caches& caches, Texture* delegate)
80            : Texture(caches), mDelegate(delegate) { }
81
82    virtual void setWrapST(GLenum wrapS, GLenum wrapT, bool bindTexture = false,
83            bool force = false, GLenum renderTarget = GL_TEXTURE_2D) override {
84        mDelegate->setWrapST(wrapS, wrapT, bindTexture, force, renderTarget);
85    }
86
87    virtual void setFilterMinMag(GLenum min, GLenum mag, bool bindTexture = false,
88            bool force = false, GLenum renderTarget = GL_TEXTURE_2D) override {
89        mDelegate->setFilterMinMag(min, mag, bindTexture, force, renderTarget);
90    }
91
92private:
93    Texture* const mDelegate;
94}; // struct DelegateTexture
95
96void AssetAtlas::createEntries(Caches& caches, int64_t* map, int count) {
97    const float width = float(mTexture->width());
98    const float height = float(mTexture->height());
99
100    for (int i = 0; i < count; ) {
101        SkPixelRef* pixelRef = reinterpret_cast<SkPixelRef*>(map[i++]);
102        // NOTE: We're converting from 64 bit signed values to 32 bit
103        // signed values. This is guaranteed to be safe because the "x"
104        // and "y" coordinate values are guaranteed to be representable
105        // with 32 bits. The array is 64 bits wide so that it can carry
106        // pointers on 64 bit architectures.
107        const int x = static_cast<int>(map[i++]);
108        const int y = static_cast<int>(map[i++]);
109
110        // Bitmaps should never be null, we're just extra paranoid
111        if (!pixelRef) continue;
112
113        const UvMapper mapper(
114                x / width, (x + pixelRef->info().width()) / width,
115                y / height, (y + pixelRef->info().height()) / height);
116
117        Texture* texture = new DelegateTexture(caches, mTexture);
118        texture->blend = !SkAlphaTypeIsOpaque(pixelRef->info().alphaType());
119        texture->wrap(mTexture->id(), pixelRef->info().width(),
120                pixelRef->info().height(), mTexture->format());
121
122        std::unique_ptr<Entry> entry(new Entry(pixelRef, texture, mapper, *this));
123        texture->uvMapper = &entry->uvMapper;
124
125        mEntries.emplace(entry->pixelRef, std::move(entry));
126    }
127}
128
129}; // namespace uirenderer
130}; // namespace android
131