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
25 namespace android {
26 namespace uirenderer {
27
28 ///////////////////////////////////////////////////////////////////////////////
29 // Lifecycle
30 ///////////////////////////////////////////////////////////////////////////////
31
init(sp<GraphicBuffer> buffer,int64_t * map,int count)32 void 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
terminate()57 void AssetAtlas::terminate() {
58 if (mImage) {
59 delete mImage;
60 mImage = nullptr;
61 updateTextureId();
62 }
63 }
64
65
updateTextureId()66 void 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
getEntry(const SkBitmap * bitmap) const84 AssetAtlas::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
getEntryTexture(const SkBitmap * bitmap) const89 Texture* 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 */
98 struct DelegateTexture: public Texture {
DelegateTextureandroid::uirenderer::DelegateTexture99 DelegateTexture(Caches& caches, Texture* delegate): Texture(caches), mDelegate(delegate) { }
100
setWrapSTandroid::uirenderer::DelegateTexture101 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
setFilterMinMagandroid::uirenderer::DelegateTexture106 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
111 private:
112 Texture* const mDelegate;
113 }; // struct DelegateTexture
114
createEntries(Caches & caches,int64_t * map,int count)115 void AssetAtlas::createEntries(Caches& caches, int64_t* map, int count) {
116 const float width = float(mTexture->width);
117 const float height = float(mTexture->height);
118
119 for (int i = 0; i < count; ) {
120 SkPixelRef* pixelRef = reinterpret_cast<SkPixelRef*>(map[i++]);
121 // NOTE: We're converting from 64 bit signed values to 32 bit
122 // signed values. This is guaranteed to be safe because the "x"
123 // and "y" coordinate values are guaranteed to be representable
124 // with 32 bits. The array is 64 bits wide so that it can carry
125 // pointers on 64 bit architectures.
126 const int x = static_cast<int>(map[i++]);
127 const int y = static_cast<int>(map[i++]);
128
129 // Bitmaps should never be null, we're just extra paranoid
130 if (!pixelRef) continue;
131
132 const UvMapper mapper(
133 x / width, (x + pixelRef->info().width()) / width,
134 y / height, (y + pixelRef->info().height()) / height);
135
136 Texture* texture = new DelegateTexture(caches, mTexture);
137 texture->blend = !SkAlphaTypeIsOpaque(pixelRef->info().alphaType());
138 texture->width = pixelRef->info().width();
139 texture->height = pixelRef->info().height();
140
141 Entry* entry = new Entry(pixelRef, texture, mapper, *this);
142 texture->uvMapper = &entry->uvMapper;
143
144 mEntries.add(entry->pixelRef, entry);
145 }
146 }
147
148 }; // namespace uirenderer
149 }; // namespace android
150