X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/ad81651f00edc6f489d9b6a0839d316a964fd521..d9e054bc6147fb286b6de2fcfe50e2ecf5649843:/src/common/imagjpeg.cpp diff --git a/src/common/imagjpeg.cpp b/src/common/imagjpeg.cpp index 245f8d911c..c8db0ce961 100644 --- a/src/common/imagjpeg.cpp +++ b/src/common/imagjpeg.cpp @@ -7,10 +7,9 @@ // 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 "imagjpeg.h" +#endif // For compilers that support precompilation, includes "wx.h". #include "wx/wxprec.h" @@ -21,17 +20,28 @@ #include "wx/defs.h" -#if wxUSE_LIBJPEG +#if wxUSE_IMAGE && wxUSE_LIBJPEG -#include "wx/image.h" +#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++). +// 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(__WATCOMC__)) + #define HAVE_BOOLEAN + #include +#endif + extern "C" { #include "jpeglib.h" } + #include "wx/filefn.h" #include "wx/wfstream.h" #include "wx/intl.h" @@ -48,9 +58,10 @@ extern "C" #endif #endif -#ifdef __WXMSW__ -#include -#endif +// we can't use METHODDEF here as it includes static yet the functions must be +// extern "C" and these can't be used together! +#undef METHODDEF +#define METHODDEF(type) extern "C" type wxC_CALLING_CONV //----------------------------------------------------------------------------- // wxJPEGHandler @@ -62,10 +73,13 @@ IMPLEMENT_DYNAMIC_CLASS(wxJPEGHandler,wxImageHandler) //------------- 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; @@ -74,47 +88,46 @@ METHODDEF(void) my_init_source ( j_decompress_ptr WXUNUSED(cinfo) ) { } -METHODDEF(boolean) my_fill_input_buffer ( 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); -} - -void jpeg_wxio_src( j_decompress_ptr cinfo, wxInputStream& infile ) -{ - my_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(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; } @@ -132,8 +145,7 @@ 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) +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; @@ -146,7 +158,35 @@ my_error_exit (j_common_ptr cinfo) longjmp(myerr->setjmp_buffer, 1); } +void jpeg_wxio_src( j_decompress_ptr cinfo, wxInputStream& infile ) +{ + my_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(my_source_mgr)); + src = (my_src_ptr) cinfo->src; + } + src = (my_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 = 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; +} + +// 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) ) { @@ -167,8 +207,9 @@ bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos /* 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) + 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; @@ -202,10 +243,6 @@ bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos return TRUE; } - - - - typedef struct { struct jpeg_destination_mgr pub; @@ -279,12 +316,12 @@ bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbo if (!verbose) cinfo.err->output_message=NULL; /* Establish the setjmp return context for my_error_exit to use. */ - if (setjmp(jerr.setjmp_buffer)) + 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) + if (verbose) wxLogError(_("JPEG: Couldn't save image.")); jpeg_destroy_compress(&cinfo); return FALSE; @@ -298,6 +335,16 @@ bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbo 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 */ @@ -312,12 +359,15 @@ bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbo return TRUE; } +#ifdef __VISUALC__ + #pragma warning(default:4611) +#endif /* VC++ */ bool wxJPEGHandler::DoCanRead( wxInputStream& stream ) { unsigned char hdr[2]; - stream.Read(&hdr, 2); + stream.Read(hdr, 2); stream.SeekI(-2, wxFromCurrent); return (hdr[0] == 0xFF && hdr[1] == 0xD8); }