AssetAtlas.cpp revision ebd52610cfeff6e557fde284a7e1efc5e6438285
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 for (size_t i = 0; i < mEntries.size(); i++) { 68 AssetAtlas::Entry* entry = mEntries.valueAt(i); 69 entry->texture->id = mTexture->id; 70 } 71} 72 73/////////////////////////////////////////////////////////////////////////////// 74// Entries 75/////////////////////////////////////////////////////////////////////////////// 76 77AssetAtlas::Entry* AssetAtlas::getEntry(const SkBitmap* bitmap) const { 78 ssize_t index = mEntries.indexOfKey(bitmap); 79 return index >= 0 ? mEntries.valueAt(index) : NULL; 80} 81 82Texture* AssetAtlas::getEntryTexture(const SkBitmap* bitmap) const { 83 ssize_t index = mEntries.indexOfKey(bitmap); 84 return index >= 0 ? mEntries.valueAt(index)->texture : NULL; 85} 86 87/** 88 * Delegates changes to wrapping and filtering to the base atlas texture 89 * instead of applying the changes to the virtual textures. 90 */ 91struct DelegateTexture: public Texture { 92 DelegateTexture(Caches& caches, Texture* delegate): Texture(caches), mDelegate(delegate) { } 93 94 virtual void setWrapST(GLenum wrapS, GLenum wrapT, bool bindTexture = false, 95 bool force = false, GLenum renderTarget = GL_TEXTURE_2D) { 96 mDelegate->setWrapST(wrapS, wrapT, bindTexture, force, renderTarget); 97 } 98 99 virtual void setFilterMinMag(GLenum min, GLenum mag, bool bindTexture = false, 100 bool force = false, GLenum renderTarget = GL_TEXTURE_2D) { 101 mDelegate->setFilterMinMag(min, mag, bindTexture, force, renderTarget); 102 } 103 104private: 105 Texture* const mDelegate; 106}; // struct DelegateTexture 107 108/** 109 * TODO: This method does not take the rotation flag into account 110 */ 111void AssetAtlas::createEntries(Caches& caches, int64_t* map, int count) { 112 const float width = float(mTexture->width); 113 const float height = float(mTexture->height); 114 115 for (int i = 0; i < count; ) { 116 SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(map[i++]); 117 // NOTE: We're converting from 64 bit signed values to 32 bit 118 // signed values. This is guaranteed to be safe because the "x" 119 // and "y" coordinate values are guaranteed to be representable 120 // with 32 bits. The array is 64 bits wide so that it can carry 121 // pointers on 64 bit architectures. 122 const int x = static_cast<int>(map[i++]); 123 const int y = static_cast<int>(map[i++]); 124 bool rotated = map[i++] > 0; 125 126 // Bitmaps should never be null, we're just extra paranoid 127 if (!bitmap) continue; 128 129 const UvMapper mapper( 130 x / width, (x + bitmap->width()) / width, 131 y / height, (y + bitmap->height()) / height); 132 133 Texture* texture = new DelegateTexture(caches, mTexture); 134 texture->blend = !bitmap->isOpaque(); 135 texture->width = bitmap->width(); 136 texture->height = bitmap->height(); 137 138 Entry* entry = new Entry(bitmap, x, y, rotated, texture, mapper, *this); 139 texture->uvMapper = &entry->uvMapper; 140 141 mEntries.add(entry->bitmap, entry); 142 } 143} 144 145}; // namespace uirenderer 146}; // namespace android 147