text: /*
   * Copyright 2011, The Android Open Source Project
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *  * Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *  * Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #define LOG_TAG "ImagesManager"
  #define LOG_NDEBUG 1
  
  #include "config.h"
  #include "ImagesManager.h"
  
  #include "AndroidLog.h"
  #include "SkCanvas.h"
  #include "SkDevice.h"
  #include "SkRefCnt.h"
  #include "ImageTexture.h"
  
  namespace WebCore {
  
  ImagesManager* ImagesManager::instance()
  {
      if (!gInstance)
          gInstance = new ImagesManager();
  
      return gInstance;
  }
  
  ImagesManager* ImagesManager::gInstance = 0;
  
  ImageTexture* ImagesManager::setImage(SkBitmapRef* imgRef)
  {
      if (!imgRef)
          return 0;
  
      TRACE_METHOD();
      SkBitmap* bitmap = &imgRef->bitmap();
      ImageTexture* image = 0;
      SkBitmap* img = 0;
      unsigned crc = 0;
  
      crc = ImageTexture::computeCRC(bitmap);
  
      {
          android::Mutex::Autolock lock(m_imagesLock);
          if (m_images.contains(crc)) {
              image = m_images.get(crc);
              SkSafeRef(image);
              return image;
          }
      }
  
      // the image is not in the map, we add it
  
      img = ImageTexture::convertBitmap(bitmap);
      image = new ImageTexture(img, crc);
  
      android::Mutex::Autolock lock(m_imagesLock);
      m_images.set(crc, image);
  
      return image;
  }
  
  ImageTexture* ImagesManager::retainImage(unsigned imgCRC)
  {
      if (!imgCRC)
          return 0;
  
      android::Mutex::Autolock lock(m_imagesLock);
      ImageTexture* image = 0;
      if (m_images.contains(imgCRC)) {
          image = m_images.get(imgCRC);
          SkSafeRef(image);
      }
      return image;
  }
  
  void ImagesManager::releaseImage(unsigned imgCRC)
  {
      if (!imgCRC)
          return;
  
      android::Mutex::Autolock lock(m_imagesLock);
      if (m_images.contains(imgCRC)) {
          ImageTexture* image = m_images.get(imgCRC);
          // don't need to remove image from the HashMap, it will unregister
          // itself by calling onImageTextureDestroy().
  
          SkSafeUnref(image);
      }
  }
  
  void ImagesManager::onImageTextureDestroy(unsigned imgCRC)
  {
      // NOTE: all unrefs must go through releaseImage, to ensure that
      // onImageTextureDestroy is called under the m_imagesLock
      m_images.remove(imgCRC);
  }
  
  int ImagesManager::nbTextures()
  {
      android::Mutex::Autolock lock(m_imagesLock);
      HashMap<unsigned, ImageTexture*>::iterator end = m_images.end();
      int i = 0;
      int nb = 0;
      for (HashMap<unsigned, ImageTexture*>::iterator it = m_images.begin(); it != end; ++it) {
          nb += it->second->nbTextures();
          i++;
      }
      return nb;
  }
  
  bool ImagesManager::prepareTextures(GLWebViewState* state)
  {
      bool ret = false;
      android::Mutex::Autolock lock(m_imagesLock);
      HashMap<unsigned, ImageTexture*>::iterator end = m_images.end();
      for (HashMap<unsigned, ImageTexture*>::iterator it = m_images.begin(); it != end; ++it) {
          ret |= it->second->prepareGL(state);
      }
      return ret;
  }
  
  } // namespace WebCore
  