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      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 
     24 namespace android {
     25 namespace uirenderer {
     26 
     27 ///////////////////////////////////////////////////////////////////////////////
     28 // Lifecycle
     29 ///////////////////////////////////////////////////////////////////////////////
     30 
     31 void 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 
     56 void AssetAtlas::terminate() {
     57     if (mImage) {
     58         delete mImage;
     59         mImage = NULL;
     60         updateTextureId();
     61     }
     62 }
     63 
     64 
     65 void AssetAtlas::updateTextureId() {
     66     mTexture->id = mImage ? mImage->getTexture() : 0;
     67     if (mTexture->id) {
     68         // Texture ID changed, force-set to defaults to sync the wrapper & GL
     69         // state objects
     70         mTexture->setWrap(GL_CLAMP_TO_EDGE, false, true);
     71         mTexture->setFilter(GL_NEAREST, false, true);
     72     }
     73     for (size_t i = 0; i < mEntries.size(); i++) {
     74         AssetAtlas::Entry* entry = mEntries.valueAt(i);
     75         entry->texture->id = mTexture->id;
     76     }
     77 }
     78 
     79 ///////////////////////////////////////////////////////////////////////////////
     80 // Entries
     81 ///////////////////////////////////////////////////////////////////////////////
     82 
     83 AssetAtlas::Entry* AssetAtlas::getEntry(const SkBitmap* bitmap) const {
     84     ssize_t index = mEntries.indexOfKey(bitmap);
     85     return index >= 0 ? mEntries.valueAt(index) : NULL;
     86 }
     87 
     88 Texture* AssetAtlas::getEntryTexture(const SkBitmap* bitmap) const {
     89     ssize_t index = mEntries.indexOfKey(bitmap);
     90     return index >= 0 ? mEntries.valueAt(index)->texture : NULL;
     91 }
     92 
     93 /**
     94  * Delegates changes to wrapping and filtering to the base atlas texture
     95  * instead of applying the changes to the virtual textures.
     96  */
     97 struct DelegateTexture: public Texture {
     98     DelegateTexture(Caches& caches, Texture* delegate): Texture(caches), mDelegate(delegate) { }
     99 
    100     virtual void setWrapST(GLenum wrapS, GLenum wrapT, bool bindTexture = false,
    101             bool force = false, GLenum renderTarget = GL_TEXTURE_2D) {
    102         mDelegate->setWrapST(wrapS, wrapT, bindTexture, force, renderTarget);
    103     }
    104 
    105     virtual void setFilterMinMag(GLenum min, GLenum mag, bool bindTexture = false,
    106             bool force = false, GLenum renderTarget = GL_TEXTURE_2D) {
    107         mDelegate->setFilterMinMag(min, mag, bindTexture, force, renderTarget);
    108     }
    109 
    110 private:
    111     Texture* const mDelegate;
    112 }; // struct DelegateTexture
    113 
    114 /**
    115  * TODO: This method does not take the rotation flag into account
    116  */
    117 void AssetAtlas::createEntries(Caches& caches, int64_t* map, int count) {
    118     const float width = float(mTexture->width);
    119     const float height = float(mTexture->height);
    120 
    121     for (int i = 0; i < count; ) {
    122         SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(map[i++]);
    123         // NOTE: We're converting from 64 bit signed values to 32 bit
    124         // signed values. This is guaranteed to be safe because the "x"
    125         // and "y" coordinate values are guaranteed to be representable
    126         // with 32 bits. The array is 64 bits wide so that it can carry
    127         // pointers on 64 bit architectures.
    128         const int x = static_cast<int>(map[i++]);
    129         const int y = static_cast<int>(map[i++]);
    130         bool rotated = map[i++] > 0;
    131 
    132         // Bitmaps should never be null, we're just extra paranoid
    133         if (!bitmap) continue;
    134 
    135         const UvMapper mapper(
    136                 x / width, (x + bitmap->width()) / width,
    137                 y / height, (y + bitmap->height()) / height);
    138 
    139         Texture* texture = new DelegateTexture(caches, mTexture);
    140         texture->blend = !bitmap->isOpaque();
    141         texture->width = bitmap->width();
    142         texture->height = bitmap->height();
    143 
    144         Entry* entry = new Entry(bitmap, x, y, rotated, texture, mapper, *this);
    145         texture->uvMapper = &entry->uvMapper;
    146 
    147         mEntries.add(entry->bitmap, entry);
    148     }
    149 }
    150 
    151 }; // namespace uirenderer
    152 }; // namespace android
    153