2 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
18 #include "loader-gif.h"
23 #include <dali/integration-api/debug.h>
24 #include <dali/integration-api/bitmap.h>
28 using Integration::Bitmap;
29 using Dali::Integration::PixelBuffer;
31 namespace TizenPlatform
37 // simple class to enforce clean-up of GIF structures
40 AutoCleanupGif(GifFileType*& _gifInfo)
49 // clean up GIF resources
50 DGifCloseFile(gifInfo);
54 GifFileType*& gifInfo;
57 // Simple class to enforce clean-up of PixelBuffer
58 struct AutoDeleteBuffer
60 AutoDeleteBuffer( PixelBuffer* _buffer )
73 // Used in the GIF interlace algorithm to determine the starting byte and the increment required
77 unsigned int startingByte;
78 unsigned int incrementalByte;
81 // Used in the GIF interlace algorithm to determine the order and which location to read data from
83 const InterlacePair INTERLACE_PAIR_TABLE [] = {
84 { 0, 8 }, // Starting at 0, read every 8 bytes.
85 { 4, 8 }, // Starting at 4, read every 8 bytes.
86 { 2, 4 }, // Starting at 2, read every 4 bytes.
87 { 1, 2 }, // Starting at 1, read every 2 bytes.
89 const unsigned int INTERLACE_PAIR_TABLE_SIZE( sizeof( INTERLACE_PAIR_TABLE ) / sizeof( InterlacePair ) );
91 /// Function used by Gif_Lib to read from the image file.
92 int ReadDataFromGif(GifFileType *gifInfo, GifByteType *data, int length)
94 FILE *fp = reinterpret_cast<FILE*>(gifInfo->UserData);
95 return fread( data, sizeof( GifByteType ), length, fp);
98 /// Loads the GIF Header.
99 bool LoadGifHeader(FILE *fp, unsigned int &width, unsigned int &height, GifFileType** gifInfo)
101 *gifInfo = DGifOpen(reinterpret_cast<void*>(fp), ReadDataFromGif);
108 width = (*gifInfo)->SWidth;
109 height = (*gifInfo)->SHeight;
111 // No proper size in GIF.
112 if ( width <= 0 || height <= 0 )
120 /// Decode the GIF image.
121 bool DecodeImage( GifFileType* gifInfo, PixelBuffer* decodedData, const unsigned int width, const unsigned int height, const unsigned int bytesPerRow )
123 if ( gifInfo->Image.Interlace )
125 // If the image is interlaced, then use the GIF interlace algorithm to read the file appropriately.
127 const InterlacePair* interlacePairPtr( INTERLACE_PAIR_TABLE );
128 for ( unsigned int interlacePair = 0; interlacePair < INTERLACE_PAIR_TABLE_SIZE; ++interlacePair, ++interlacePairPtr )
130 for( unsigned int currentByte = interlacePairPtr->startingByte; currentByte < height; currentByte += interlacePairPtr->incrementalByte )
132 PixelBuffer* row = decodedData + currentByte * bytesPerRow;
133 if ( DGifGetLine( gifInfo, row, width ) == GIF_ERROR )
135 DALI_LOG_ERROR( "GIF Loader: Error reading Interlaced GIF\n" );
143 // Non-interlace does not require any erratic reading / jumping.
144 PixelBuffer* decodedDataPtr( decodedData );
146 for ( unsigned int row = 0; row < height; ++row )
148 if ( DGifGetLine( gifInfo, decodedDataPtr, width ) == GIF_ERROR)
150 DALI_LOG_ERROR( "GIF Loader: Error reading non-interlaced GIF\n" );
153 decodedDataPtr += bytesPerRow;
159 // Retrieves the colors used in the GIF image.
160 GifColorType* GetImageColors( SavedImage* image, GifFileType* gifInfo )
162 GifColorType* color( NULL );
163 if ( image->ImageDesc.ColorMap )
165 color = image->ImageDesc.ColorMap->Colors;
169 // if there is no color map for this image use the default one
170 color = gifInfo->SColorMap->Colors;
175 /// Called when we want to handle IMAGE_DESC_RECORD_TYPE
176 bool HandleImageDescriptionRecordType( Bitmap& bitmap, GifFileType* gifInfo, unsigned int width, unsigned int height, bool& finished )
178 if ( DGifGetImageDesc( gifInfo ) == GIF_ERROR )
180 DALI_LOG_ERROR( "GIF Loader: Error getting Image Description\n" );
184 // Ensure there is at least 1 image in the GIF.
185 if ( gifInfo->ImageCount < 1 )
187 DALI_LOG_ERROR( "GIF Loader: No Images\n" );
191 SavedImage* image( &gifInfo->SavedImages[ gifInfo->ImageCount - 1 ] );
192 const GifImageDesc& desc( image->ImageDesc );
194 // Create a buffer to store the decoded data.
195 PixelBuffer* decodedData( new PixelBuffer[ width * height * sizeof( GifPixelType ) ] );
196 AutoDeleteBuffer autoDeleteBuffer( decodedData );
198 const unsigned int bytesPerRow( width * sizeof( GifPixelType ) );
199 const unsigned int actualWidth( desc.Width );
200 const unsigned int actualHeight( desc.Height );
202 // Decode the GIF Image
203 if ( !DecodeImage( gifInfo, decodedData, actualWidth, actualHeight, bytesPerRow ) )
208 // Get the colormap for the GIF
209 GifColorType* color( GetImageColors( image, gifInfo ) );
211 // If it's an animated GIF, we still only read the first image
213 // Create and populate pixel buffer.
215 Pixel::Format pixelFormat( Pixel::RGB888 );
216 PixelBuffer *pixels = bitmap.GetPackedPixelsProfile()->ReserveBuffer( pixelFormat, actualWidth, actualHeight );
218 for (unsigned int row = 0; row < actualHeight; ++row)
220 for (unsigned int column = 0; column < actualWidth; ++column)
222 unsigned char index = decodedData[row * width + column];
224 pixels[0] = color[index].Red;
225 pixels[1] = color[index].Green;
226 pixels[2] = color[index].Blue;
236 /// Called when we want to handle EXTENSION_RECORD_TYPE
237 bool HandleExtensionRecordType( GifFileType* gifInfo )
240 image.ExtensionBlocks = NULL;
241 image.ExtensionBlockCount = 0;
242 GifByteType *extensionByte( NULL );
244 // Not really interested in the extensions so just skip them unless there is an error.
245 for ( int extRetCode = DGifGetExtension( gifInfo, &image.Function, &extensionByte );
246 extensionByte != NULL;
247 extRetCode = DGifGetExtensionNext( gifInfo, &extensionByte ) )
249 if ( extRetCode == GIF_ERROR )
251 DALI_LOG_ERROR( "GIF Loader: Error reading GIF Extension record.\n" );
259 } // unnamed namespace
261 bool LoadGifHeader( const ImageLoader::Input& input, unsigned int& width, unsigned int& height )
263 GifFileType* gifInfo = NULL;
264 AutoCleanupGif autoCleanupGif(gifInfo);
265 FILE* const fp = input.file;
267 return LoadGifHeader(fp, width, height, &gifInfo);
270 bool LoadBitmapFromGif( const ResourceLoadingClient& client, const ImageLoader::Input& input, Integration::Bitmap& bitmap )
272 FILE* const fp = input.file;
273 // Load the GIF Header file.
275 GifFileType* gifInfo( NULL );
276 unsigned int width( 0 );
277 unsigned int height( 0 );
278 if ( !LoadGifHeader( fp, width, height, &gifInfo ) )
282 AutoCleanupGif autoGif( gifInfo );
284 // Check each record in the GIF file.
286 bool finished( false );
287 GifRecordType recordType( UNDEFINED_RECORD_TYPE );
288 for ( int returnCode = DGifGetRecordType( gifInfo, &recordType );
289 !finished && recordType != TERMINATE_RECORD_TYPE;
290 returnCode = DGifGetRecordType( gifInfo, &recordType ) )
292 if ( returnCode == GIF_ERROR )
294 DALI_LOG_ERROR( "GIF Loader: Error getting Record Type\n" );
298 if( IMAGE_DESC_RECORD_TYPE == recordType )
300 if ( !HandleImageDescriptionRecordType( bitmap, gifInfo, width, height, finished ) )
305 else if ( EXTENSION_RECORD_TYPE == recordType )
307 if ( !HandleExtensionRecordType( gifInfo ))
317 } // namespace TizenPlatform