X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/c972e125b6a8d219da47fe729af717931e5076ff..b40b0f5b204d59bbc1d3e66c5bba192b878469a6:/src/common/imagjpeg.cpp diff --git a/src/common/imagjpeg.cpp b/src/common/imagjpeg.cpp index e91863170c..3078d70528 100644 --- a/src/common/imagjpeg.cpp +++ b/src/common/imagjpeg.cpp @@ -1,20 +1,15 @@ ///////////////////////////////////////////////////////////////////////////// // 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 ///////////////////////////////////////////////////////////////////////////// -/* - We don't put pragma implement in this file because it is already present in - src/common/image.cpp - #ifdef __GNUG__ -#pragma implementation "image.h" +#pragma implementation "imagjpeg.h" #endif -*/ // For compilers that support precompilation, includes "wx.h". #include "wx/wxprec.h" @@ -23,16 +18,19 @@ #pragma hdrstop #endif -#include "wx/image.h" +#include "wx/defs.h" + +#if 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 +extern "C" +{ + #include "jpeglib.h" } -#endif #include "wx/filefn.h" #include "wx/wfstream.h" #include "wx/intl.h" @@ -40,6 +38,8 @@ extern "C" { // For memcpy #include +// For JPEG library error handling +#include #ifdef __SALFORDC__ #ifdef FAR @@ -55,65 +55,85 @@ extern "C" { // 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(-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; @@ -122,23 +142,68 @@ void jpeg_wxio_src( j_decompress_ptr cinfo, wxInputStream& infile ) } +// 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); +} + + + +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 ); @@ -150,7 +215,7 @@ bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream ) 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 ); @@ -167,19 +232,19 @@ bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream ) 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, @@ -191,7 +256,7 @@ METHODDEF(void) init_destination (j_compress_ptr cinfo) 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; @@ -210,13 +275,13 @@ METHODDEF(void) term_destination (j_compress_ptr cinfo) 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; @@ -224,26 +289,42 @@ GLOBAL(void) jpeg_wxio_dest (j_compress_ptr cinfo, wxOutputStream& outfile) 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); 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]; @@ -251,12 +332,26 @@ bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream ) } jpeg_finish_compress(&cinfo); jpeg_destroy_compress(&cinfo); - + return TRUE; } -#endif // wxUSE_STREAMS -#endif -// wxUSE_LIBJPEG +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 + + + + +