/////////////////////////////////////////////////////////////////////////////
-// Name: imagjpeg.cpp
+// Name: src/common/imagjpeg.cpp
// Purpose: wxImage JPEG handler
// Author: Vaclav Slavik
// RCS-ID: $Id$
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-/*
- We don't put pragma implement in this file because it is already present in
- src/common/image.cpp
-*/
-
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
-#pragma hdrstop
+ #pragma hdrstop
#endif
-#include "wx/defs.h"
+#if wxUSE_IMAGE && wxUSE_LIBJPEG
+
+#include "wx/imagjpeg.h"
+#include "wx/versioninfo.h"
-#if wxUSE_LIBJPEG
+#ifndef WX_PRECOMP
+ #include "wx/log.h"
+ #include "wx/app.h"
+ #include "wx/intl.h"
+ #include "wx/bitmap.h"
+ #include "wx/module.h"
+#endif
+
+// 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.
+//
+#ifdef wxHACK_BOOLEAN
+ #define HAVE_BOOLEAN
+ #define boolean wxHACK_BOOLEAN
+#endif
-#include "wx/image.h"
-#include "wx/bitmap.h"
-#include "wx/debug.h"
-#include "wx/log.h"
-#include "wx/app.h"
extern "C"
{
+ #if defined(__WXMSW__)
+ #define XMD_H
+ #endif
#include "jpeglib.h"
}
+
+#ifndef HAVE_WXJPEG_BOOLEAN
+typedef boolean wxjpeg_boolean;
+#endif
+
#include "wx/filefn.h"
#include "wx/wfstream.h"
-#include "wx/intl.h"
-#include "wx/module.h"
// For memcpy
#include <string.h>
// For JPEG library error handling
#include <setjmp.h>
-#ifdef __SALFORDC__
-#ifdef FAR
-#undef FAR
-#endif
-#endif
-
-#ifdef __WXMSW__
-#include <windows.h>
+// ----------------------------------------------------------------------------
+// types
+// ----------------------------------------------------------------------------
+
+// the standard definition of METHODDEF(type) from jmorecfg.h is "static type"
+// which means that we can't declare the method functions as extern "C" - the
+// compiler (rightfully) complains about the multiple storage classes in
+// declaration
+//
+// so we only add extern "C" when using our own, modified, jmorecfg.h - and use
+// whatever we have in the system headers if this is what we use hoping that it
+// should be ok (can't do anything else)
+#ifdef JPEG_METHOD_LINKAGE
+ #define CPP_METHODDEF(type) extern "C" METHODDEF(type)
+#else // not using our jmorecfg.h header
+ #define CPP_METHODDEF(type) METHODDEF(type)
#endif
//-----------------------------------------------------------------------------
// wxJPEGHandler
//-----------------------------------------------------------------------------
-#if !USE_SHARED_LIBRARIES
IMPLEMENT_DYNAMIC_CLASS(wxJPEGHandler,wxImageHandler)
-#endif
#if wxUSE_STREAMS
//------------- JPEG Data Source Manager
+#define JPEG_IO_BUFFER_SIZE 2048
+
typedef struct {
struct jpeg_source_mgr pub; /* public fields */
JOCTET* buffer; /* start of buffer */
-} my_source_mgr;
+ wxInputStream *stream;
+} wx_source_mgr;
-typedef my_source_mgr * my_src_ptr;
+typedef wx_source_mgr * wx_src_ptr;
-METHODDEF(void) my_init_source ( j_decompress_ptr WXUNUSED(cinfo) )
+extern "C"
{
-}
-METHODDEF(boolean) my_fill_input_buffer ( j_decompress_ptr WXUNUSED(cinfo) )
+CPP_METHODDEF(void) wx_init_source ( j_decompress_ptr WXUNUSED(cinfo) )
{
- return TRUE;
}
-METHODDEF(void) my_skip_input_data ( j_decompress_ptr cinfo, long num_bytes )
+CPP_METHODDEF(wxjpeg_boolean) wx_fill_input_buffer ( j_decompress_ptr cinfo )
{
- my_src_ptr src = (my_src_ptr) cinfo->src;
+ wx_src_ptr src = (wx_src_ptr) cinfo->src;
+
+ src->pub.next_input_byte = src->buffer;
+ src->pub.bytes_in_buffer = src->stream->Read(src->buffer, JPEG_IO_BUFFER_SIZE).LastRead();
- src->pub.next_input_byte += (size_t) num_bytes;
- src->pub.bytes_in_buffer -= (size_t) num_bytes;
+ if (src->pub.bytes_in_buffer == 0) // check for end-of-stream
+ {
+ // Insert a fake EOI marker
+ src->buffer[0] = 0xFF;
+ src->buffer[1] = JPEG_EOI;
+ src->pub.bytes_in_buffer = 2;
+ }
+ return TRUE;
}
-METHODDEF(void) my_term_source ( j_decompress_ptr cinfo )
+CPP_METHODDEF(void) wx_skip_input_data ( j_decompress_ptr cinfo, long num_bytes )
{
- my_src_ptr src = (my_src_ptr) cinfo->src;
-
- free (src->buffer);
+ if (num_bytes > 0)
+ {
+ wx_src_ptr src = (wx_src_ptr) cinfo->src;
+
+ while (num_bytes > (long)src->pub.bytes_in_buffer)
+ {
+ num_bytes -= (long) src->pub.bytes_in_buffer;
+ src->pub.fill_input_buffer(cinfo);
+ }
+ src->pub.next_input_byte += (size_t) num_bytes;
+ src->pub.bytes_in_buffer -= (size_t) num_bytes;
+ }
}
-void jpeg_wxio_src( j_decompress_ptr cinfo, wxInputStream& infile )
+CPP_METHODDEF(void) wx_term_source ( j_decompress_ptr cinfo )
{
- my_src_ptr src;
+ wx_src_ptr src = (wx_src_ptr) cinfo->src;
- if (cinfo->src == NULL) { /* first time for this JPEG object? */
- cinfo->src = (struct jpeg_source_mgr *)
- (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
- sizeof(my_source_mgr));
- src = (my_src_ptr) cinfo->src;
- }
- src = (my_src_ptr) cinfo->src;
- src->pub.bytes_in_buffer = infile.GetSize(); /* forces fill_input_buffer on first read */
- src->buffer = (JOCTET *) malloc (infile.GetSize());
- src->pub.next_input_byte = src->buffer; /* until buffer loaded */
- infile.Read(src->buffer, infile.GetSize());
-
- src->pub.init_source = my_init_source;
- src->pub.fill_input_buffer = my_fill_input_buffer;
- src->pub.skip_input_data = my_skip_input_data;
- src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
- src->pub.term_source = my_term_source;
+ if (src->pub.bytes_in_buffer > 0)
+ src->stream->SeekI(-(long)src->pub.bytes_in_buffer, wxFromCurrent);
+ delete[] src->buffer;
}
// JPEG error manager:
-struct my_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 my_error_mgr * my_error_ptr;
-
/*
* Here's the routine that will replace the standard error_exit method:
*/
-METHODDEF(void)
-my_error_exit (j_common_ptr cinfo)
+CPP_METHODDEF(void) wx_error_exit (j_common_ptr cinfo)
{
- /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
- my_error_ptr myerr = (my_error_ptr) cinfo->err;
+ /* cinfo->err really points to a wx_error_mgr struct, so coerce pointer */
+ wx_error_mgr * const jerr = (wx_error_mgr *) cinfo->err;
/* Always display the message. */
/* We could postpone this until after returning, if we chose. */
- if (cinfo->err->output_message) (*cinfo->err->output_message) (cinfo);
+ (*cinfo->err->output_message) (cinfo);
/* Return control to the setjmp point */
- longjmp(myerr->setjmp_buffer, 1);
+ longjmp(jerr->setjmp_buffer, 1);
+}
+
+/*
+ * This will replace the standard output_message method when the user
+ * wants us to be silent (verbose==false). We must have such method instead of
+ * simply using NULL for cinfo->err->output_message because it's called
+ * unconditionally from within libjpeg when there's "garbage input".
+ */
+CPP_METHODDEF(void) wx_ignore_message (j_common_ptr WXUNUSED(cinfo))
+{
}
+void wx_jpeg_io_src( j_decompress_ptr cinfo, wxInputStream& infile )
+{
+ wx_src_ptr src;
+
+ if (cinfo->src == NULL) { /* first time for this JPEG object? */
+ cinfo->src = (struct jpeg_source_mgr *)
+ (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
+ sizeof(wx_source_mgr));
+ }
+ src = (wx_src_ptr) cinfo->src;
+ src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
+ src->buffer = new JOCTET[JPEG_IO_BUFFER_SIZE];
+ src->pub.next_input_byte = NULL; /* until buffer loaded */
+ src->stream = &infile;
+
+ src->pub.init_source = wx_init_source;
+ src->pub.fill_input_buffer = wx_fill_input_buffer;
+ src->pub.skip_input_data = wx_skip_input_data;
+ src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
+ src->pub.term_source = wx_term_source;
+}
+
+} // extern "C"
+
+static inline void wx_cmyk_to_rgb(unsigned char* rgb, const unsigned char* cmyk)
+{
+ register int k = 255 - cmyk[3];
+ register int k2 = cmyk[3];
+ register int c;
+
+ c = k + k2 * (255 - cmyk[0]) / 255;
+ rgb[0] = (unsigned char)((c > 255) ? 0 : (255 - c));
+
+ c = k + k2 * (255 - cmyk[1]) / 255;
+ rgb[1] = (unsigned char)((c > 255) ? 0 : (255 - c));
+
+ c = k + k2 * (255 - cmyk[2]) / 255;
+ rgb[2] = (unsigned char)((c > 255) ? 0 : (255 - c));
+}
+// temporarily disable the warning C4611 (interaction between '_setjmp' and
+// C++ object destruction is non-portable) - I don't see any dtors here
+#ifdef __VISUALC__
+ #pragma warning(disable:4611)
+#endif /* VC++ */
-bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose )
+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 my_error_mgr jerr;
- JSAMPARRAY tempbuf;
+ wx_error_mgr jerr;
unsigned char *ptr;
- unsigned stride;
+ // 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 = my_error_exit;
- if (!verbose) cinfo.err->output_message=NULL;
+ 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 my_error_exit to use. */
+ /* 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(_("Couldn't load a JPEG image - probably file is corrupted."));
+ 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;
+ if (image->IsOk()) image->Destroy();
+ return false;
}
jpeg_create_decompress( &cinfo );
- jpeg_wxio_src( &cinfo, stream );
+ wx_jpeg_io_src( &cinfo, stream );
jpeg_read_header( &cinfo, TRUE );
- cinfo.out_color_space = JCS_RGB;
+
+ 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.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;
+ return false;
}
- image->SetMask( 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 ) {
+ 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 );
- memcpy( ptr, tempbuf[0], stride );
- ptr += stride;
+ 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;
+ }
+ }
}
- jpeg_finish_decompress( &cinfo );
- jpeg_destroy_decompress( &cinfo );
- return TRUE;
-}
+ // 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;
+}
typedef struct {
struct jpeg_destination_mgr pub;
wxOutputStream *stream;
JOCTET * buffer;
-} my_destination_mgr;
+} wx_destination_mgr;
-typedef my_destination_mgr * my_dest_ptr;
+typedef wx_destination_mgr * wx_dest_ptr;
#define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */
-METHODDEF(void) init_destination (j_compress_ptr cinfo)
+extern "C"
+{
+
+CPP_METHODDEF(void) wx_init_destination (j_compress_ptr cinfo)
{
- my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
+ wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
/* Allocate the output buffer --- it will be released when done with image */
dest->buffer = (JOCTET *)
dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
}
-METHODDEF(boolean) empty_output_buffer (j_compress_ptr cinfo)
+CPP_METHODDEF(wxjpeg_boolean) wx_empty_output_buffer (j_compress_ptr cinfo)
{
- my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
+ wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
dest->stream->Write(dest->buffer, OUTPUT_BUF_SIZE);
dest->pub.next_output_byte = dest->buffer;
return TRUE;
}
-METHODDEF(void) term_destination (j_compress_ptr cinfo)
+CPP_METHODDEF(void) wx_term_destination (j_compress_ptr cinfo)
{
- my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
+ wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
/* Write any data remaining in the buffer */
if (datacount > 0)
dest->stream->Write(dest->buffer, datacount);
}
-GLOBAL(void) jpeg_wxio_dest (j_compress_ptr cinfo, wxOutputStream& outfile)
+GLOBAL(void) wx_jpeg_io_dest (j_compress_ptr cinfo, wxOutputStream& outfile)
{
- my_dest_ptr dest;
+ wx_dest_ptr dest;
if (cinfo->dest == NULL) { /* first time for this JPEG object? */
cinfo->dest = (struct jpeg_destination_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
- sizeof(my_destination_mgr));
+ sizeof(wx_destination_mgr));
}
- dest = (my_dest_ptr) cinfo->dest;
- dest->pub.init_destination = init_destination;
- dest->pub.empty_output_buffer = empty_output_buffer;
- dest->pub.term_destination = term_destination;
+ dest = (wx_dest_ptr) cinfo->dest;
+ dest->pub.init_destination = wx_init_destination;
+ dest->pub.empty_output_buffer = wx_empty_output_buffer;
+ dest->pub.term_destination = wx_term_destination;
dest->stream = &outfile;
}
+} // extern "C"
+
bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
{
struct jpeg_compress_struct cinfo;
- struct my_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 = my_error_exit;
-
- if (!verbose) cinfo.err->output_message=NULL;
-
- /* Establish the setjmp return context for my_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(_("Couldn't save a JPEG image - probably file is corrupted."));
- jpeg_destroy_compress(&cinfo);
- return FALSE;
+ 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 save image."));
+ }
+ jpeg_destroy_compress(&cinfo);
+ return false;
}
jpeg_create_compress(&cinfo);
- jpeg_wxio_dest(&cinfo, stream);
+ wx_jpeg_io_dest(&cinfo, stream);
cinfo.image_width = image->GetWidth();
cinfo.image_height = image->GetHeight();
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults(&cinfo);
+
+ // TODO: 3rd parameter is force_baseline, what value should this be?
+ // Code says: "If force_baseline is TRUE, the computed quantization table entries
+ // are limited to 1..255 for JPEG baseline compatibility."
+ // 'Quality' is a number between 0 (terrible) and 100 (very good).
+ // The default (in jcparam.c, jpeg_set_defaults) is 75,
+ // and force_baseline is TRUE.
+ if (image->HasOption(wxIMAGE_OPTION_QUALITY))
+ jpeg_set_quality(&cinfo, image->GetOptionInt(wxIMAGE_OPTION_QUALITY), TRUE);
+
+ // set the resolution fields in the output file
+ int resX, resY;
+ wxImageResolution res = GetResolutionFromOptions(*image, &resX, &resY);
+ if ( res != wxIMAGE_RESOLUTION_NONE )
+ {
+ cinfo.X_density = resX;
+ cinfo.Y_density = resY;
+
+ // it so happens that wxIMAGE_RESOLUTION_INCHES/CM values are the same
+ // ones as used by libjpeg, so we can assign them directly
+ cinfo.density_unit = res;
+ }
+
jpeg_start_compress(&cinfo, TRUE);
stride = cinfo.image_width * 3; /* JSAMPLEs per row in image_buffer */
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
- return TRUE;
+ return true;
}
+#ifdef __VISUALC__
+ #pragma warning(default:4611)
+#endif /* VC++ */
bool wxJPEGHandler::DoCanRead( wxInputStream& stream )
{
unsigned char hdr[2];
- stream.Read(&hdr, 2);
- stream.SeekI(-2, wxFromCurrent);
- return (hdr[0] == 0xFF && hdr[1] == 0xD8);
+ 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
-#endif // wxUSE_LIBJPEG
-
-
-
-
-
+/*static*/ wxVersionInfo wxJPEGHandler::GetLibraryVersionInfo()
+{
+ return wxVersionInfo("libjpeg", JPEG_LIB_VERSION/10, JPEG_LIB_VERSION%10);
+}
+#endif // wxUSE_LIBJPEG
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