bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
{
struct jpeg_decompress_struct cinfo;
struct wx_error_mgr jerr;
JSAMPARRAY tempbuf;
unsigned char *ptr;
unsigned stride;
image->Destroy();
cinfo.err = jpeg_std_error( &jerr.pub );
jerr.pub.error_exit = wx_error_exit;
if (!verbose) cinfo.err->output_message=NULL;
/* Establish the setjmp return context for wx_error_exit to use. */
if (setjmp(jerr.setjmp_buffer)) {
/* If we get here, the JPEG code has signaled an error.
* We need to clean up the JPEG object, close the input file, and return.
*/
if (verbose)
wxLogError(_("JPEG: Couldn't load - file is probably corrupted."));
(cinfo.src->term_source)(&cinfo);
jpeg_destroy_decompress(&cinfo);
if (image->Ok()) image->Destroy();
return false;
}
jpeg_create_decompress( &cinfo );
wx_jpeg_io_src( &cinfo, stream );
jpeg_read_header( &cinfo, TRUE );
cinfo.out_color_space = JCS_RGB;
jpeg_start_decompress( &cinfo );
image->Create( cinfo.image_width, cinfo.image_height );
if (!image->Ok()) {
jpeg_finish_decompress( &cinfo );
jpeg_destroy_decompress( &cinfo );
return false;
}
image->SetMask( false );
ptr = image->GetData();
stride = cinfo.output_width * 3;
tempbuf = (*cinfo.mem->alloc_sarray)
((j_common_ptr) &cinfo, JPOOL_IMAGE, stride, 1 );
while ( cinfo.output_scanline < cinfo.output_height ) {
jpeg_read_scanlines( &cinfo, tempbuf, 1 );
memcpy( ptr, tempbuf[0], stride );
ptr += stride;
}
jpeg_finish_decompress( &cinfo );
jpeg_destroy_decompress( &cinfo );
return true;
}
bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
{
wxCHECK_MSG( image, false, "NULL image pointer" );
struct jpeg_decompress_struct cinfo;
wx_error_mgr jerr;
unsigned char *ptr;
// save this before calling Destroy()
const unsigned maxWidth = image->GetOptionInt(wxIMAGE_OPTION_MAX_WIDTH),
maxHeight = image->GetOptionInt(wxIMAGE_OPTION_MAX_HEIGHT);
image->Destroy();
cinfo.err = jpeg_std_error( &jerr );
jerr.error_exit = wx_error_exit;
if (!verbose)
cinfo.err->output_message = wx_ignore_message;
/* Establish the setjmp return context for wx_error_exit to use. */
if (setjmp(jerr.setjmp_buffer)) {
/* If we get here, the JPEG code has signaled an error.
* We need to clean up the JPEG object, close the input file, and return.
*/
if (verbose)
{
wxLogError(_("JPEG: Couldn't load - file is probably corrupted."));
}
(cinfo.src->term_source)(&cinfo);
jpeg_destroy_decompress(&cinfo);
if (image->IsOk()) image->Destroy();
return false;
}
jpeg_create_decompress( &cinfo );
wx_jpeg_io_src( &cinfo, stream );
jpeg_read_header( &cinfo, TRUE );
int bytesPerPixel;
if ((cinfo.out_color_space == JCS_CMYK) || (cinfo.out_color_space == JCS_YCCK))
{
cinfo.out_color_space = JCS_CMYK;
bytesPerPixel = 4;
}
else // all the rest is treated as RGB
{
cinfo.out_color_space = JCS_RGB;
bytesPerPixel = 3;
}
// scale the picture to fit in the specified max size if necessary
if ( maxWidth > 0 || maxHeight > 0 )
{
unsigned& scale = cinfo.scale_denom;
while ( (maxWidth && (cinfo.image_width / scale > maxWidth)) ||
(maxHeight && (cinfo.image_height / scale > maxHeight)) )
{
scale *= 2;
}
}
jpeg_start_decompress( &cinfo );
image->Create( cinfo.output_width, cinfo.output_height );
if (!image->IsOk()) {
jpeg_finish_decompress( &cinfo );
jpeg_destroy_decompress( &cinfo );
return false;
}
image->SetMask( false );
ptr = image->GetData();
unsigned stride = cinfo.output_width * bytesPerPixel;
JSAMPARRAY tempbuf = (*cinfo.mem->alloc_sarray)
((j_common_ptr) &cinfo, JPOOL_IMAGE, stride, 1 );
while ( cinfo.output_scanline < cinfo.output_height )
{
jpeg_read_scanlines( &cinfo, tempbuf, 1 );
if (cinfo.out_color_space == JCS_RGB)
{
memcpy( ptr, tempbuf[0], stride );
ptr += stride;
}
else // CMYK
{
const unsigned char* inptr = (const unsigned char*) tempbuf[0];
for (size_t i = 0; i < cinfo.output_width; i++)
{
wx_cmyk_to_rgb(ptr, inptr);
ptr += 3;
inptr += 4;
}
}
}
// set up resolution if available: it's part of optional JFIF APP0 chunk
if ( cinfo.saw_JFIF_marker )
{
image->SetOption(wxIMAGE_OPTION_RESOLUTIONX, cinfo.X_density);
image->SetOption(wxIMAGE_OPTION_RESOLUTIONY, cinfo.Y_density);
// we use the same values for this option as libjpeg so we don't need
// any conversion here
image->SetOption(wxIMAGE_OPTION_RESOLUTIONUNIT, cinfo.density_unit);
}
if ( cinfo.image_width != cinfo.output_width || cinfo.image_height != cinfo.output_height )
{
// save the original image size
image->SetOption(wxIMAGE_OPTION_ORIGINAL_WIDTH, cinfo.image_width);
image->SetOption(wxIMAGE_OPTION_ORIGINAL_HEIGHT, cinfo.image_height);
}
jpeg_finish_decompress( &cinfo );
jpeg_destroy_decompress( &cinfo );
return true;
}
