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