dali/internal/event/images/encoded-buffer-image-impl.cpp

   1 /*
   2  * Copyright (c) 2014 Samsung Electronics Co., Ltd.
   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
  18 // CLASS HEADER
  19 #include <dali/internal/event/images/encoded-buffer-image-impl.h>
  20
  21 // EXTERNAL INCLUDES
  22 #include <cstring> // for memcpy
  23
  24 // INTERNAL INCLUDES
  25 #include <dali/public-api/object/type-registry.h>
  26 #include <dali/internal/event/common/thread-local-storage.h>
  27 #include <dali/internal/event/resources/resource-client.h>
  28 #include <dali/integration-api/platform-abstraction.h>
  29
  30 namespace Dali
  31 {
  32 namespace Internal
  33 {
  34
  35 namespace
  36 {
  37 TypeRegistration mType( typeid( Dali::EncodedBufferImage ), typeid( Dali::Image ), NULL );
  38 } // unnamed namespace
  39
  40 EncodedBufferImagePtr EncodedBufferImage::New( const uint8_t * const encodedImage,
  41                                                std::size_t encodedImageByteCount,
  42                                                ImageDimensions size, FittingMode::Type fittingMode, SamplingMode::Type samplingMode,
  43                                                bool orientationCorrection )
  44 {
  45   DALI_ASSERT_DEBUG( encodedImage && "Null image pointer passed-in for decoding from memory." );
  46   DALI_ASSERT_DEBUG( encodedImageByteCount > 0U && "Zero size passed for image resource in memory buffer." );
  47   DALI_ASSERT_ALWAYS( encodedImage && (encodedImageByteCount != 0) );
  48   // SEGV early before we allocate anything if the caller passed in an invalid
  49   // input buffer by reading both ends of it:
  50   DALI_ASSERT_ALWAYS( static_cast<int>( encodedImage[0] + encodedImage[encodedImageByteCount-1] ) != -1 );
  51
  52   EncodedBufferImagePtr image( new EncodedBufferImage() );
  53   image->Initialize(); // Second stage initialization
  54
  55   // Replicate the functionality of ImageFactory::load() without the filesystem caching:
  56   Dali::Integration::BitmapResourceType resourceType( size, fittingMode, samplingMode, orientationCorrection );
  57   RequestBufferPtr buffer( new RequestBuffer );
  58   buffer->GetVector().Resize( encodedImageByteCount );
  59   // Resize() won't throw on failure, so avoid a SEGV if the allocation failed:
  60   DALI_ASSERT_ALWAYS( buffer->GetVector().Size() >= encodedImageByteCount );
  61
  62   memcpy( &(buffer->GetVector()[0]), encodedImage, encodedImageByteCount );
  63
  64   // Get image size from buffer
  65   Dali::Integration::PlatformAbstraction& platformAbstraction = Internal::ThreadLocalStorage::Get().GetPlatformAbstraction();
  66   const ImageDimensions expectedSize = platformAbstraction.GetClosestImageSize( buffer, size, fittingMode, samplingMode, orientationCorrection );
  67   image->mWidth = (unsigned int) expectedSize.GetWidth();
  68   image->mHeight = (unsigned int) expectedSize.GetHeight();
  69
  70   // Load the image synchronously
  71   Integration::BitmapPtr bitmap = platformAbstraction.DecodeBuffer( resourceType, &(buffer->GetVector()[0]), encodedImageByteCount );
  72
  73   if( bitmap )
  74   {
  75     ResourceClient &resourceClient = ThreadLocalStorage::Get().GetResourceClient();
  76     image->mTicket = resourceClient.AddBitmapImage( bitmap.Get() );
  77     image->mTicket->AddObserver( *image );
  78   }
  79
  80   return image;
  81 }
  82
  83 } // namespace Internal
  84 } // namespace Dali