Signed-off-by: Alex Kent Hajnal <software@alephnull.net>pull/277/head
Alex Kent Hajnal
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// WebP read support
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// © 2024 Alexander Hajnal
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// Based loosely on jp2.cpp
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//
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// If implementing write support it's suggested to use lossless mode with exact
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// mode enabled when the quality setting is 100 and for other qualities to use
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// lossy mode with the default settings.
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//
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// This library is distributed under the conditions of the GNU LGPL.
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#include "config.h"
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#include <tdetempfile.h>
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#include <tqfile.h>
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#include <tqimage.h>
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#include <webp/decode.h>
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#include <cstdlib>
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#ifdef __cplusplus
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extern "C" {
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#endif
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TDE_EXPORT void kimgio_webp_read( TQImageIO* io )
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{
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int width, height;
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FILE* in;
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// === Read the source file ===
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// Based on code in jp2.cpp
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// for QIODevice's other than TQFile, a temp. file is used.
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KTempFile* tempf = 0;
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TQFile* qf = 0;
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if( ( qf = dynamic_cast<TQFile*>( io->ioDevice() ) ) ) {
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// great, it's a TQFile. Let's just take the filename.
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in = fopen( TQFile::encodeName( qf->name() ), "rb" );
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} else {
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// not a TQFile. Copy the whole data to a temp. file.
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tempf = new KTempFile();
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if( tempf->status() != 0 ) {
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delete tempf;
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return;
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} // if
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tempf->setAutoDelete( true );
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TQFile* out = tempf->file();
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// 4096 (=4k) is a common page size.
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TQByteArray b( 4096 );
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TQ_LONG size;
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// 0 or -1 is EOF / error
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while( ( size = io->ioDevice()->readBlock( b.data(), 4096 ) ) > 0 ) {
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// in case of a write error, still give the decoder a try
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if( ( out->writeBlock( b.data(), size ) ) == -1 ) break;
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} // while
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// flush everything out to disk
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out->flush();
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in = fopen( TQFile::encodeName( tempf->name() ), "rb" );
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} // else
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if( ! in ) {
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delete tempf;
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return;
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} // if
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// File is now open
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// === Load compressed data ===
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// Find file's size
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fseek(in, 0L, SEEK_END); // Seek to end of file
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long size = ftell(in); // Get position (i.e. the file size)
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fseek(in, 0L, SEEK_SET); // Seek back to start of file
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// Sanity check
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if ( size > SIZE_MAX ) {
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// File size is larger than a size_t can hold
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fclose( in );
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delete tempf;
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return;
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}
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// Allocate a buffer for the compressed data
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uint8_t* compressed_image = (uint8_t*)malloc(size);
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if( ! compressed_image ) {
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// malloc failed
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fclose( in );
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delete tempf;
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return;
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} // if
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// Read compressed image into buffer
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size_t bytes_read = fread( compressed_image, sizeof(uint8_t), size, in );
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// Close the compressed image file
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fclose( in );
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delete tempf;
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if ( bytes_read < size ) {
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// Read failed
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free( compressed_image );
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return;
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}
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// === Decompress image ===
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// Get image dimensions
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if ( ! WebPGetInfo( compressed_image, size, &width, &height ) ) {
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// Error
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free( compressed_image );
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return;
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}
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// Create an appropriately sized image
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TQImage image;
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if( ! image.create( width, height, 32 ) ) {
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// Error
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free( compressed_image );
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return;
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}
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// Enable alpha channel
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image.setAlphaBuffer(true);
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// Get the image buffer
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uint32_t* data = (uint32_t*)image.bits();
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// Decompress the image
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#ifdef WORDS_BIGENDIAN
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if ( ! WebPDecodeARGBInto( compressed_image, size, (uint8_t*)data, width*height*4, width*4) ) {
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#else
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if ( ! WebPDecodeBGRAInto( compressed_image, size, (uint8_t*)data, width*height*4, width*4) ) {
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#endif
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// Error
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free( compressed_image );
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return;
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}
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// Free the compressed image buffer
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free( compressed_image );
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// Finalize load
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io->setImage( image );
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io->setStatus( 0 );
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} // kimgio_webp_read
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#ifdef __cplusplus
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}
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#endif
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@ -0,0 +1,17 @@
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// WebP read support
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// © 2024 Alexander Hajnal
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// Based on jp2.h
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//
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// This library is distributed under the conditions of the GNU LGPL.
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#ifndef KIMG_WEBP_H
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#define KIMG_WEBP_H
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class TQImageIO;
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extern "C" {
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void kimgio_webp_read( TQImageIO* io );
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// void kimgio_webp_write( TQImageIO* io ); // Not currently supported
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} // extern "C"
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#endif
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