Home | History | Annotate | Download | only in hwui 
      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 
     25 namespace android {
     26 namespace uirenderer {
     27 
     28 ///////////////////////////////////////////////////////////////////////////////
     29 // Lifecycle
     30 ///////////////////////////////////////////////////////////////////////////////
     31 
     32 void 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 
     57 void AssetAtlas::terminate() {
     58     if (mImage) {
     59         delete mImage;
     60         mImage = nullptr;
     61         updateTextureId();
     62     }
     63 }
     64 
     65 
     66 void 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 
     84 AssetAtlas::Entry* AssetAtlas::getEntry(const SkBitmap* bitmap) const {
     85     ssize_t index = mEntries.indexOfKey(bitmap->pixelRef());
     86     return index >= 0 ? mEntries.valueAt(index) : nullptr;
     87 }
     88 
     89 Texture* AssetAtlas::getEntryTexture(const SkBitmap* bitmap) const {
     90     ssize_t index = mEntries.indexOfKey(bitmap->pixelRef());
     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  */
     98 struct 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 
    111 private:
    112     Texture* const mDelegate;
    113 }; // struct DelegateTexture
    114 
    115 void AssetAtlas::createEntries(Caches& caches, int64_t* map, int count) {
    116     const float width = float(mTexture->width);
    117     const float height = float(mTexture->height);
    118 
    119     for (int i = 0; i < count; ) {
    120         SkPixelRef* pixelRef = reinterpret_cast<SkPixelRef*>(map[i++]);
    121         // NOTE: We're converting from 64 bit signed values to 32 bit
    122         // signed values. This is guaranteed to be safe because the "x"
    123         // and "y" coordinate values are guaranteed to be representable
    124         // with 32 bits. The array is 64 bits wide so that it can carry
    125         // pointers on 64 bit architectures.
    126         const int x = static_cast<int>(map[i++]);
    127         const int y = static_cast<int>(map[i++]);
    128 
    129         // Bitmaps should never be null, we're just extra paranoid
    130         if (!pixelRef) continue;
    131 
    132         const UvMapper mapper(
    133                 x / width, (x + pixelRef->info().width()) / width,
    134                 y / height, (y + pixelRef->info().height()) / height);
    135 
    136         Texture* texture = new DelegateTexture(caches, mTexture);
    137         texture->blend = !SkAlphaTypeIsOpaque(pixelRef->info().alphaType());
    138         texture->width = pixelRef->info().width();
    139         texture->height = pixelRef->info().height();
    140 
    141         Entry* entry = new Entry(pixelRef, texture, mapper, *this);
    142         texture->uvMapper = &entry->uvMapper;
    143 
    144         mEntries.add(entry->pixelRef, entry);
    145     }
    146 }
    147 
    148 }; // namespace uirenderer
    149 }; // namespace android
    150