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

   1 /*
   2  * Copyright (c) 2017 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/devel-api/common/ref-counted-dali-vector.h>
  27 #include <dali/internal/event/common/thread-local-storage.h>
  28 #include <dali/integration-api/platform-abstraction.h>
  29
  30 namespace Dali
  31 {
  32 namespace Internal
  33 {
  34
  35 namespace
  36 {
  37
  38 TypeRegistration mType( typeid( Dali::EncodedBufferImage ), typeid( Dali::Image ), NULL );
  39
  40 /** Raw bytes of a resource laid out exactly as it would be in a file, but in memory. */
  41 typedef Dali::RefCountedVector<uint8_t> RequestBuffer;
  42 /** Counting smart pointer for managing a buffer of raw bytes. */
  43 typedef IntrusivePtr<RequestBuffer>     RequestBufferPtr;
  44
  45 } // unnamed namespace
  46
  47 EncodedBufferImagePtr EncodedBufferImage::New( const uint8_t * const encodedImage,
  48                                                std::size_t encodedImageByteCount,
  49                                                ImageDimensions size, FittingMode::Type fittingMode, SamplingMode::Type samplingMode,
  50                                                bool orientationCorrection )
  51 {
  52   DALI_ASSERT_DEBUG( encodedImage && "Null image pointer passed-in for decoding from memory." );
  53   DALI_ASSERT_DEBUG( encodedImageByteCount > 0U && "Zero size passed for image resource in memory buffer." );
  54   DALI_ASSERT_ALWAYS( encodedImage && (encodedImageByteCount != 0) );
  55   // SEGV early before we allocate anything if the caller passed in an invalid
  56   // input buffer by reading both ends of it:
  57   DALI_ASSERT_ALWAYS( static_cast<int>( encodedImage[0] + encodedImage[encodedImageByteCount-1] ) != -1 );
  58
  59   EncodedBufferImagePtr image( new EncodedBufferImage() );
  60   image->Initialize(); // Second stage initialization
  61
  62   Dali::Integration::BitmapResourceType resourceType( size, fittingMode, samplingMode, orientationCorrection );
  63   RequestBufferPtr buffer( new RequestBuffer );
  64   buffer->GetVector().Resize( encodedImageByteCount );
  65   // Resize() won't throw on failure, so avoid a SEGV if the allocation failed:
  66   DALI_ASSERT_ALWAYS( buffer->GetVector().Size() >= encodedImageByteCount );
  67
  68   memcpy( &(buffer->GetVector()[0]), encodedImage, encodedImageByteCount );
  69
  70   // Get image size from buffer
  71   Dali::Integration::PlatformAbstraction& platformAbstraction = Internal::ThreadLocalStorage::Get().GetPlatformAbstraction();
  72   const ImageDimensions expectedSize = platformAbstraction.GetClosestImageSize( buffer, size, fittingMode, samplingMode, orientationCorrection );
  73   image->mWidth = static_cast<unsigned int>( expectedSize.GetWidth() );
  74   image->mHeight = static_cast<unsigned int>( expectedSize.GetHeight() );
  75
  76   // Load the image synchronously
  77   Integration::BitmapPtr bitmap = platformAbstraction.DecodeBuffer( resourceType, &(buffer->GetVector()[0]), encodedImageByteCount );
  78
  79   if( bitmap )
  80   {
  81     unsigned width  = bitmap->GetImageWidth();
  82     unsigned height = bitmap->GetImageHeight();
  83
  84     //Create texture
  85     Pixel::Format format = bitmap->GetPixelFormat();
  86     image->mTexture = Texture::New( Dali::TextureType::TEXTURE_2D, format, width, height );
  87
  88     //Upload data to the texture
  89     uint32_t bufferSize = bitmap->GetBufferSize();
  90     PixelDataPtr pixelData = PixelData::New( bitmap->GetBufferOwnership(), bufferSize, width, height, format,
  91                                              static_cast< Dali::PixelData::ReleaseFunction >( bitmap->GetReleaseFunction() ) );
  92     image->mTexture->Upload( pixelData );
  93
  94     image->mWidth = size.GetWidth();
  95     if( image->mWidth == 0 )
  96     {
  97       image->mWidth = width;
  98     }
  99
 100     image->mHeight = size.GetHeight();
 101     if( image->mHeight == 0 )
 102     {
 103       image->mHeight = height;
 104     }
 105   }
 106   else
 107   {
 108     image->mTexture = Texture::New( Dali::TextureType::TEXTURE_2D, Pixel::RGBA8888, 0u, 0u );
 109     image->mWidth = image->mHeight = 0u;
 110   }
 111
 112   return image;
 113 }
 114
 115 } // namespace Internal
 116 } // namespace Dali