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/integration-api/platform-abstraction.h>
  28
  29 namespace Dali
  30 {
  31 namespace Internal
  32 {
  33
  34 namespace
  35 {
  36 TypeRegistration mType( typeid( Dali::EncodedBufferImage ), typeid( Dali::Image ), NULL );
  37 } // unnamed namespace
  38
  39 EncodedBufferImagePtr EncodedBufferImage::New( const uint8_t * const encodedImage,
  40                                                std::size_t encodedImageByteCount,
  41                                                ImageDimensions size, FittingMode::Type fittingMode, SamplingMode::Type samplingMode,
  42                                                bool orientationCorrection )
  43 {
  44   DALI_ASSERT_DEBUG( encodedImage && "Null image pointer passed-in for decoding from memory." );
  45   DALI_ASSERT_DEBUG( encodedImageByteCount > 0U && "Zero size passed for image resource in memory buffer." );
  46   DALI_ASSERT_ALWAYS( encodedImage && (encodedImageByteCount != 0) );
  47   // SEGV early before we allocate anything if the caller passed in an invalid
  48   // input buffer by reading both ends of it:
  49   DALI_ASSERT_ALWAYS( static_cast<int>( encodedImage[0] + encodedImage[encodedImageByteCount-1] ) != -1 );
  50
  51   EncodedBufferImagePtr image( new EncodedBufferImage() );
  52   image->Initialize(); // Second stage initialization
  53
  54   Dali::Integration::BitmapResourceType resourceType( size, fittingMode, samplingMode, orientationCorrection );
  55   RequestBufferPtr buffer( new RequestBuffer );
  56   buffer->GetVector().Resize( encodedImageByteCount );
  57   // Resize() won't throw on failure, so avoid a SEGV if the allocation failed:
  58   DALI_ASSERT_ALWAYS( buffer->GetVector().Size() >= encodedImageByteCount );
  59
  60   memcpy( &(buffer->GetVector()[0]), encodedImage, encodedImageByteCount );
  61
  62   // Get image size from buffer
  63   Dali::Integration::PlatformAbstraction& platformAbstraction = Internal::ThreadLocalStorage::Get().GetPlatformAbstraction();
  64   const ImageDimensions expectedSize = platformAbstraction.GetClosestImageSize( buffer, size, fittingMode, samplingMode, orientationCorrection );
  65   image->mWidth = (unsigned int) expectedSize.GetWidth();
  66   image->mHeight = (unsigned int) expectedSize.GetHeight();
  67
  68   // Load the image synchronously
  69   Integration::BitmapPtr bitmap = platformAbstraction.DecodeBuffer( resourceType, &(buffer->GetVector()[0]), encodedImageByteCount );
  70
  71   if( bitmap )
  72   {
  73     unsigned width  = bitmap->GetImageWidth();
  74     unsigned height = bitmap->GetImageHeight();
  75
  76     //Create texture
  77     Pixel::Format format = bitmap->GetPixelFormat();
  78     image->mTexture = NewTexture::New( Dali::TextureType::TEXTURE_2D, format, width, height );
  79
  80     //Upload data to the texture
  81     size_t bufferSize = bitmap->GetBufferSize();
  82     PixelDataPtr pixelData = PixelData::New( bitmap->GetBufferOwnership(), bufferSize, width, height, format,
  83                                              static_cast< Dali::PixelData::ReleaseFunction >( bitmap->GetReleaseFunction() ) );
  84     image->mTexture->Upload( pixelData );
  85
  86     image->mWidth = size.GetWidth();
  87     if( image->mWidth == 0 )
  88     {
  89       image->mWidth = width;
  90     }
  91
  92     image->mHeight = size.GetHeight();
  93     if( image->mHeight == 0 )
  94     {
  95       image->mHeight = height;
  96     }
  97   }
  98   else
  99   {
 100     image->mTexture = NewTexture::New( Dali::TextureType::TEXTURE_2D, Pixel::RGBA8888, 0u, 0u );
 101     image->mWidth = image->mHeight = 0u;
 102   }
 103
 104   return image;
 105 }
 106
 107 } // namespace Internal
 108 } // namespace Dali