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
23 namespace android {
24 namespace uirenderer {
25
26 ///////////////////////////////////////////////////////////////////////////////
27 // Lifecycle
28 ///////////////////////////////////////////////////////////////////////////////
29
init(sp<GraphicBuffer> buffer,int64_t * map,int count)30 void 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
terminate()52 void AssetAtlas::terminate() {
53 delete mImage;
54 mImage = nullptr;
55 delete mTexture;
56 mTexture = nullptr;
57 mEntries.clear();
58 }
59
60 ///////////////////////////////////////////////////////////////////////////////
61 // Entries
62 ///////////////////////////////////////////////////////////////////////////////
63
getEntry(const SkPixelRef * pixelRef) const64 AssetAtlas::Entry* AssetAtlas::getEntry(const SkPixelRef* pixelRef) const {
65 auto result = mEntries.find(pixelRef);
66 return result != mEntries.end() ? result->second.get() : nullptr;
67 }
68
getEntryTexture(const SkPixelRef * pixelRef) const69 Texture* 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 */
78 struct DelegateTexture: public Texture {
DelegateTextureandroid::uirenderer::DelegateTexture79 DelegateTexture(Caches& caches, Texture* delegate)
80 : Texture(caches), mDelegate(delegate) { }
81
setWrapSTandroid::uirenderer::DelegateTexture82 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
setFilterMinMagandroid::uirenderer::DelegateTexture87 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
92 private:
93 Texture* const mDelegate;
94 }; // struct DelegateTexture
95
createEntries(Caches & caches,int64_t * map,int count)96 void 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