// Name: src/common/imagjpeg.cpp
// Purpose: wxImage JPEG handler
// Author: Vaclav Slavik
-// RCS-ID: $Id$
// Copyright: (c) Vaclav Slavik
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#if wxUSE_IMAGE && wxUSE_LIBJPEG
#include "wx/imagjpeg.h"
+#include "wx/versioninfo.h"
#ifndef WX_PRECOMP
#include "wx/log.h"
// A hack based on one from tif_jpeg.c to overcome the problem on Windows
// of rpcndr.h defining boolean with a different type to the jpeg headers.
-//
+//
// This hack is only necessary for an external jpeg library, the builtin one
// usually used on Windows doesn't use the type boolean, so always works.
//
// For JPEG library error handling
#include <setjmp.h>
-#ifdef __SALFORDC__
-#undef FAR
-#endif
-
// ----------------------------------------------------------------------------
// types
// ----------------------------------------------------------------------------
// JPEG error manager:
-struct wx_error_mgr {
- struct jpeg_error_mgr pub; /* "public" fields */
-
+struct wx_error_mgr : public jpeg_error_mgr
+{
jmp_buf setjmp_buffer; /* for return to caller */
};
-typedef struct wx_error_mgr * wx_error_ptr;
-
/*
* Here's the routine that will replace the standard error_exit method:
*/
CPP_METHODDEF(void) wx_error_exit (j_common_ptr cinfo)
{
/* cinfo->err really points to a wx_error_mgr struct, so coerce pointer */
- wx_error_ptr myerr = (wx_error_ptr) cinfo->err;
+ wx_error_mgr * const jerr = (wx_error_mgr *) cinfo->err;
/* Always display the message. */
/* We could postpone this until after returning, if we chose. */
(*cinfo->err->output_message) (cinfo);
/* Return control to the setjmp point */
- longjmp(myerr->setjmp_buffer, 1);
+ longjmp(jerr->setjmp_buffer, 1);
}
/*
bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
{
+ wxCHECK_MSG( image, false, "NULL image pointer" );
+
struct jpeg_decompress_struct cinfo;
- struct wx_error_mgr jerr;
+ 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.pub );
- jerr.pub.error_exit = wx_error_exit;
+
+ cinfo.err = jpeg_std_error( &jerr );
+ jerr.error_exit = wx_error_exit;
if (!verbose)
cinfo.err->output_message = wx_ignore_message;
* 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();
+ if (image->IsOk()) image->Destroy();
return false;
}
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.image_width, cinfo.image_height );
- if (!image->Ok()) {
+ image->Create( cinfo.output_width, cinfo.output_height );
+ if (!image->IsOk()) {
jpeg_finish_decompress( &cinfo );
jpeg_destroy_decompress( &cinfo );
return false;
}
}
+ // 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;
bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
{
struct jpeg_compress_struct cinfo;
- struct wx_error_mgr jerr;
+ wx_error_mgr jerr;
JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
JSAMPLE *image_buffer;
int stride; /* physical row width in image buffer */
- cinfo.err = jpeg_std_error(&jerr.pub);
- jerr.pub.error_exit = wx_error_exit;
+ cinfo.err = jpeg_std_error(&jerr);
+ jerr.error_exit = wx_error_exit;
if (!verbose)
cinfo.err->output_message = wx_ignore_message;
* We need to clean up the JPEG object, close the input file, and return.
*/
if (verbose)
+ {
wxLogError(_("JPEG: Couldn't save image."));
+ }
jpeg_destroy_compress(&cinfo);
return false;
}
{
unsigned char hdr[2];
- if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
+ if ( !stream.Read(hdr, WXSIZEOF(hdr)) ) // it's ok to modify the stream position here
return false;
return hdr[0] == 0xFF && hdr[1] == 0xD8;
#endif // wxUSE_STREAMS
+/*static*/ wxVersionInfo wxJPEGHandler::GetLibraryVersionInfo()
+{
+ return wxVersionInfo("libjpeg", JPEG_LIB_VERSION/10, JPEG_LIB_VERSION%10);
+}
+
#endif // wxUSE_LIBJPEG
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