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