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wxWidgets/src/common/imagjpeg.cpp
Julian Smart 655719367a Use old licence name 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@27408 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2004-05-23 20:53:33 +00:00

414 lines
12 KiB
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/////////////////////////////////////////////////////////////////////////////
// Name: imagjpeg.cpp
// Purpose: wxImage JPEG handler
// Author: Vaclav Slavik
// RCS-ID: $Id$
// Copyright: (c) Vaclav Slavik
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "imagjpeg.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#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"
// NB: Some compilers define boolean type in Windows headers
// (e.g. Watcom C++, but not Open Watcom).
// This causes a conflict with jmorecfg.h header from libjpeg, so we have
// to make sure libjpeg won't try to define boolean itself. This is done by
// defining HAVE_BOOLEAN.
#if defined(__WXMSW__) && (defined(__MWERKS__) || defined(__DIGITALMARS__) || (defined(__WATCOMC__) && __WATCOMC__ < 1200))
#define HAVE_BOOLEAN
#include "wx/msw/wrapwin.h"
#endif
extern "C"
{
#if defined(__WXMSW__)
#define XMD_H
#endif
#include "jpeglib.h"
}
#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__
#undef FAR
#endif
// ----------------------------------------------------------------------------
// 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
//-----------------------------------------------------------------------------
IMPLEMENT_DYNAMIC_CLASS(wxJPEGHandler,wxImageHandler)
#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;
} wx_source_mgr;
typedef wx_source_mgr * wx_src_ptr;
CPP_METHODDEF(void) wx_init_source ( j_decompress_ptr WXUNUSED(cinfo) )
{
}
CPP_METHODDEF(boolean) wx_fill_input_buffer ( j_decompress_ptr cinfo )
{
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();
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;
}
CPP_METHODDEF(void) wx_skip_input_data ( j_decompress_ptr cinfo, long num_bytes )
{
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;
}
}
CPP_METHODDEF(void) wx_term_source ( j_decompress_ptr cinfo )
{
wx_src_ptr src = (wx_src_ptr) cinfo->src;
if (src->pub.bytes_in_buffer > 0)
src->stream->SeekI(-(long)src->pub.bytes_in_buffer, wxFromCurrent);
delete[] src->buffer;
}
// JPEG error manager:
struct wx_error_mgr {
struct jpeg_error_mgr pub; /* "public" fields */
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;
/* 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);
}
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;
}
// 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 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;
}
typedef struct {
struct jpeg_destination_mgr pub;
wxOutputStream *stream;
JOCTET * buffer;
} wx_destination_mgr;
typedef wx_destination_mgr * wx_dest_ptr;
#define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */
CPP_METHODDEF(void) wx_init_destination (j_compress_ptr cinfo)
{
wx_dest_ptr dest = (wx_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,
OUTPUT_BUF_SIZE * sizeof(JOCTET));
dest->pub.next_output_byte = dest->buffer;
dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
}
CPP_METHODDEF(boolean) wx_empty_output_buffer (j_compress_ptr cinfo)
{
wx_dest_ptr dest = (wx_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;
return TRUE;
}
CPP_METHODDEF(void) wx_term_destination (j_compress_ptr cinfo)
{
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) wx_jpeg_io_dest (j_compress_ptr cinfo, wxOutputStream& outfile)
{
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(wx_destination_mgr));
}
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;
}
bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
{
struct jpeg_compress_struct cinfo;
struct 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;
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 save image."));
jpeg_destroy_compress(&cinfo);
return FALSE;
}
jpeg_create_compress(&cinfo);
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(wxT("quality")))
jpeg_set_quality(&cinfo, image->GetOptionInt(wxT("quality")), TRUE);
// sets the resolution fields in the output file
if (image->HasOption(wxIMAGE_OPTION_RESOLUTION))
{
cinfo.X_density =
cinfo.Y_density = image->GetOptionInt(wxIMAGE_OPTION_RESOLUTION);
}
// sets the resolution unit field in the output file
// wxIMAGE_RESOLUTION_INCHES for inches
// wxIMAGE_RESOLUTION_CM for centimeters
if (image->HasOption(wxIMAGE_OPTION_RESOLUTIONUNIT))
{
cinfo.density_unit = image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONUNIT);
}
jpeg_start_compress(&cinfo, TRUE);
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_write_scanlines( &cinfo, row_pointer, 1 );
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
return TRUE;
}
#ifdef __VISUALC__
#pragma warning(default:4611)
#endif /* VC++ */
bool wxJPEGHandler::DoCanRead( wxInputStream& stream )
{
unsigned char hdr[2];
if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
return FALSE;
return hdr[0] == 0xFF && hdr[1] == 0xD8;
}
#endif // wxUSE_STREAMS
#endif // wxUSE_LIBJPEG
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