/////////////////////////////////////////////////////////////////////////////
// Name: imagjpeg.cpp
// Purpose: wxImage JPEG handler
-// Author: Robert Roebling
+// Author: Vaclav Slavik
// RCS-ID: $Id$
-// Copyright: (c) Robert Roebling
+// Copyright: (c) Vaclav Slavik
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
-#pragma implementation "image.h"
+#pragma implementation "imagjpeg.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#pragma hdrstop
#endif
-#include "wx/image.h"
+#include "wx/defs.h"
+
+#if wxUSE_IMAGE && wxUSE_LIBJPEG
+
+#include "wx/imagjpeg.h"
#include "wx/bitmap.h"
#include "wx/debug.h"
#include "wx/log.h"
#include "wx/app.h"
-#if wxUSE_LIBJPEG
-extern "C" {
-#include <jpeglib.h>
+extern "C"
+{
+ #include "jpeglib.h"
}
-#endif
#include "wx/filefn.h"
#include "wx/wfstream.h"
#include "wx/intl.h"
// For memcpy
#include <string.h>
+// For JPEG library error handling
+#include <setjmp.h>
#ifdef __SALFORDC__
#ifdef FAR
// wxJPEGHandler
//-----------------------------------------------------------------------------
-#if wxUSE_LIBJPEG
-
-#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 */
+ wxInputStream *stream;
} my_source_mgr;
typedef my_source_mgr * my_src_ptr;
-METHODDEF(void) my_init_source ( j_decompress_ptr cinfo )
+METHODDEF(void) my_init_source ( j_decompress_ptr WXUNUSED(cinfo) )
{
}
METHODDEF(boolean) my_fill_input_buffer ( j_decompress_ptr cinfo )
{
+ my_src_ptr src = (my_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();
+
+ 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_skip_input_data ( j_decompress_ptr cinfo, long num_bytes )
{
- my_src_ptr src = (my_src_ptr) cinfo->src;
-
- src->pub.next_input_byte += (size_t) num_bytes;
- src->pub.bytes_in_buffer -= (size_t) num_bytes;
+ if (num_bytes > 0)
+ {
+ my_src_ptr src = (my_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;
+ }
}
METHODDEF(void) my_term_source ( j_decompress_ptr cinfo )
{
my_src_ptr src = (my_src_ptr) cinfo->src;
-
- free (src->buffer);
+
+ if (src->pub.bytes_in_buffer > 0)
+ src->stream->SeekI(-(long)src->pub.bytes_in_buffer, wxFromCurrent);
+ delete[] src->buffer;
}
void jpeg_wxio_src( j_decompress_ptr cinfo, wxInputStream& infile )
{
my_src_ptr src;
-
- if (cinfo->src == NULL) { /* first time for this JPEG object? */
+
+ 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.StreamSize(); /* forces fill_input_buffer on first read */
- src->buffer = (JOCTET *) malloc (infile.StreamSize());
- src->pub.next_input_byte = src->buffer; /* until buffer loaded */
- infile.Read(src->buffer, infile.StreamSize());
-
+ 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 = my_init_source;
src->pub.fill_input_buffer = my_fill_input_buffer;
src->pub.skip_input_data = my_skip_input_data;
}
+// JPEG error manager:
+
+struct my_error_mgr {
+ struct jpeg_error_mgr pub; /* "public" fields */
-bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream )
+ 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)
+{
+ /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
+ my_error_ptr myerr = (my_error_ptr) 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);
+
+ /* Return control to the setjmp point */
+ longjmp(myerr->setjmp_buffer, 1);
+}
+
+// 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, int WXUNUSED(index) )
{
struct jpeg_decompress_struct cinfo;
- struct jpeg_error_mgr jerr;
+ struct my_error_mgr jerr;
JSAMPARRAY tempbuf;
unsigned char *ptr;
unsigned stride;
-
+
image->Destroy();
- cinfo.err = jpeg_std_error( &jerr );
+ 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(_("JPEG: Couldn't load - file is probably corrupted."));
+ jpeg_destroy_decompress(&cinfo);
+ if (image->Ok()) image->Destroy();
+ return FALSE;
+ }
+
jpeg_create_decompress( &cinfo );
jpeg_wxio_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 );
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 );
return TRUE;
}
-
-
-
-
typedef struct {
struct jpeg_destination_mgr pub;
-
+
wxOutputStream *stream;
JOCTET * buffer;
} my_destination_mgr;
typedef my_destination_mgr * my_dest_ptr;
-#define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */
+#define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */
METHODDEF(void) init_destination (j_compress_ptr cinfo)
{
my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
-
+
/* Allocate the output buffer --- it will be released when done with image */
dest->buffer = (JOCTET *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
METHODDEF(boolean) empty_output_buffer (j_compress_ptr cinfo)
{
my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
-
+
dest->stream->Write(dest->buffer, OUTPUT_BUF_SIZE);
dest->pub.next_output_byte = dest->buffer;
dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
GLOBAL(void) jpeg_wxio_dest (j_compress_ptr cinfo, wxOutputStream& outfile)
{
my_dest_ptr dest;
-
- if (cinfo->dest == NULL) { /* first time for this JPEG object? */
+
+ 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));
}
-
+
dest = (my_dest_ptr) cinfo->dest;
dest->pub.init_destination = init_destination;
dest->pub.empty_output_buffer = empty_output_buffer;
dest->stream = &outfile;
}
-bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream )
+bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
{
struct jpeg_compress_struct cinfo;
- struct jpeg_error_mgr jerr;
- JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
+ struct my_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);
+ 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(_("JPEG: Couldn't save image."));
+ jpeg_destroy_compress(&cinfo);
+ return FALSE;
+ }
+
jpeg_create_compress(&cinfo);
jpeg_wxio_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(wxT("quality")))
+ jpeg_set_quality(&cinfo, image->GetOptionInt(wxT("quality")), TRUE);
+
jpeg_start_compress(&cinfo, TRUE);
-
- stride = cinfo.image_width * 3; /* JSAMPLEs per row in image_buffer */
+
+ stride = cinfo.image_width * 3; /* JSAMPLEs per row in image_buffer */
image_buffer = image->GetData();
while (cinfo.next_scanline < cinfo.image_height) {
row_pointer[0] = &image_buffer[cinfo.next_scanline * stride];
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
-
+
return TRUE;
}
-#endif // wxUSE_STREAMS
-#endif
+#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);
+}
+
+#endif // wxUSE_STREAMS
+
+#endif // wxUSE_LIBJPEG
+
+
+
+
-// wxUSE_LIBJPEG
projects / wxWidgets.git / blobdiff