AssetAtlas.cpp revision 7809f835cae637c12eebdc92103ad88890228d97
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); 86 return index >= 0 ? mEntries.valueAt(index) : nullptr; 87} 88 89Texture* AssetAtlas::getEntryTexture(const SkBitmap* bitmap) const { 90 ssize_t index = mEntries.indexOfKey(bitmap); 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 SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(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 (!bitmap) continue; 135 136 const UvMapper mapper( 137 x / width, (x + bitmap->width()) / width, 138 y / height, (y + bitmap->height()) / height); 139 140 Texture* texture = new DelegateTexture(caches, mTexture); 141 texture->blend = !bitmap->isOpaque(); 142 texture->width = bitmap->width(); 143 texture->height = bitmap->height(); 144 145 Entry* entry = new Entry(bitmap, x, y, rotated, texture, mapper, *this); 146 texture->uvMapper = &entry->uvMapper; 147 148 mEntries.add(entry->bitmap, entry); 149 } 150} 151 152}; // namespace uirenderer 153}; // namespace android 154