AssetAtlas.cpp revision 15c3f19a445b8df575911a16e8a6dba755a084b5
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->width = buffer->getWidth(); 43 mTexture->height = buffer->getHeight(); 44 createEntries(caches, map, count); 45 } 46 } else { 47 ALOGW("Could not create atlas image"); 48 delete mImage; 49 mImage = nullptr; 50 } 51 52 updateTextureId(); 53} 54 55void AssetAtlas::terminate() { 56 if (mImage) { 57 delete mImage; 58 mImage = nullptr; 59 updateTextureId(); 60 } 61} 62 63 64void AssetAtlas::updateTextureId() { 65 mTexture->id = mImage ? mImage->getTexture() : 0; 66 if (mTexture->id) { 67 // Texture ID changed, force-set to defaults to sync the wrapper & GL 68 // state objects 69 mTexture->setWrap(GL_CLAMP_TO_EDGE, false, true); 70 mTexture->setFilter(GL_NEAREST, false, true); 71 } 72 for (size_t i = 0; i < mEntries.size(); i++) { 73 AssetAtlas::Entry* entry = mEntries.valueAt(i); 74 entry->texture->id = mTexture->id; 75 } 76} 77 78/////////////////////////////////////////////////////////////////////////////// 79// Entries 80/////////////////////////////////////////////////////////////////////////////// 81 82AssetAtlas::Entry* AssetAtlas::getEntry(const SkPixelRef* pixelRef) const { 83 ssize_t index = mEntries.indexOfKey(pixelRef); 84 return index >= 0 ? mEntries.valueAt(index) : nullptr; 85} 86 87Texture* AssetAtlas::getEntryTexture(const SkPixelRef* pixelRef) const { 88 ssize_t index = mEntries.indexOfKey(pixelRef); 89 return index >= 0 ? mEntries.valueAt(index)->texture : nullptr; 90} 91 92/** 93 * Delegates changes to wrapping and filtering to the base atlas texture 94 * instead of applying the changes to the virtual textures. 95 */ 96struct DelegateTexture: public Texture { 97 DelegateTexture(Caches& caches, Texture* delegate): Texture(caches), mDelegate(delegate) { } 98 99 virtual void setWrapST(GLenum wrapS, GLenum wrapT, bool bindTexture = false, 100 bool force = false, GLenum renderTarget = GL_TEXTURE_2D) override { 101 mDelegate->setWrapST(wrapS, wrapT, bindTexture, force, renderTarget); 102 } 103 104 virtual void setFilterMinMag(GLenum min, GLenum mag, bool bindTexture = false, 105 bool force = false, GLenum renderTarget = GL_TEXTURE_2D) override { 106 mDelegate->setFilterMinMag(min, mag, bindTexture, force, renderTarget); 107 } 108 109private: 110 Texture* const mDelegate; 111}; // struct DelegateTexture 112 113void AssetAtlas::createEntries(Caches& caches, int64_t* map, int count) { 114 const float width = float(mTexture->width); 115 const float height = float(mTexture->height); 116 117 for (int i = 0; i < count; ) { 118 SkPixelRef* pixelRef = reinterpret_cast<SkPixelRef*>(map[i++]); 119 // NOTE: We're converting from 64 bit signed values to 32 bit 120 // signed values. This is guaranteed to be safe because the "x" 121 // and "y" coordinate values are guaranteed to be representable 122 // with 32 bits. The array is 64 bits wide so that it can carry 123 // pointers on 64 bit architectures. 124 const int x = static_cast<int>(map[i++]); 125 const int y = static_cast<int>(map[i++]); 126 127 // Bitmaps should never be null, we're just extra paranoid 128 if (!pixelRef) continue; 129 130 const UvMapper mapper( 131 x / width, (x + pixelRef->info().width()) / width, 132 y / height, (y + pixelRef->info().height()) / height); 133 134 Texture* texture = new DelegateTexture(caches, mTexture); 135 texture->blend = !SkAlphaTypeIsOpaque(pixelRef->info().alphaType()); 136 texture->width = pixelRef->info().width(); 137 texture->height = pixelRef->info().height(); 138 139 Entry* entry = new Entry(pixelRef, texture, mapper, *this); 140 texture->uvMapper = &entry->uvMapper; 141 142 mEntries.add(entry->pixelRef, entry); 143 } 144} 145 146}; // namespace uirenderer 147}; // namespace android 148