X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/8f49300284e2c91095ae3ebe62cb3a6d424eac21..59d04dff037f66e9e73b389de72835211f5f0bcd:/src/common/imagpng.cpp diff --git a/src/common/imagpng.cpp b/src/common/imagpng.cpp index cee55ca261..b1fea3c1fe 100644 --- a/src/common/imagpng.cpp +++ b/src/common/imagpng.cpp @@ -22,7 +22,7 @@ #include "wx/defs.h" #endif -#if wxUSE_LIBPNG +#if wxUSE_IMAGE && wxUSE_LIBPNG #include "wx/imagpng.h" #include "wx/bitmap.h" @@ -56,43 +56,91 @@ IMPLEMENT_DYNAMIC_CLASS(wxPNGHandler,wxImageHandler) #if wxUSE_LIBPNG -#if defined(__VISAGECPP__) -#define LINKAGEMODE _Optlink -#else -#define LINKAGEMODE +#ifndef PNGLINKAGEMODE + #define PNGLINKAGEMODE LINKAGEMODE #endif -static void LINKAGEMODE _PNG_stream_reader( png_structp png_ptr, png_bytep data, png_size_t length ) + +// VS: wxPNGInfoStruct declared below is a hack that needs some explanation. +// First, let me describe what's the problem: libpng uses jmp_buf in +// its png_struct structure. Unfortunately, this structure is +// compiler-specific and may vary in size, so if you use libpng compiled +// as DLL with another compiler than the main executable, it may not work +// (this is for example the case with wxMGL port and SciTech MGL library +// that provides custom runtime-loadable libpng implementation with jmpbuf +// disabled altogether). Luckily, it is still possible to use setjmp() & +// longjmp() as long as the structure is not part of png_struct. +// +// Sadly, there's no clean way to attach user-defined data to png_struct. +// There is only one customizable place, png_struct.io_ptr, which is meant +// only for I/O routines and is set with png_set_read_fn or +// png_set_write_fn. The hacky part is that we use io_ptr to store +// a pointer to wxPNGInfoStruct that holds I/O structures _and_ jmp_buf. + +struct wxPNGInfoStruct { - ((wxInputStream*) png_get_io_ptr( png_ptr )) -> Read(data, length); + jmp_buf jmpbuf; + bool verbose; + + union + { + wxInputStream *in; + wxOutputStream *out; + } stream; +}; + +#define WX_PNG_INFO(png_ptr) ((wxPNGInfoStruct*)png_get_io_ptr(png_ptr)) + + +extern "C" +{ + +void PNGLINKAGEMODE _PNG_stream_reader( png_structp png_ptr, png_bytep data, png_size_t length ) +{ + WX_PNG_INFO(png_ptr)->stream.in->Read(data, length); } -static void LINKAGEMODE _PNG_stream_writer( png_structp png_ptr, png_bytep data, png_size_t length ) +void PNGLINKAGEMODE _PNG_stream_writer( png_structp png_ptr, png_bytep data, png_size_t length ) { - ((wxOutputStream*) png_get_io_ptr( png_ptr )) -> Write(data, length); + WX_PNG_INFO(png_ptr)->stream.out->Write(data, length); } // from pngerror.c // so that the libpng doesn't send anything on stderr void -LINKAGEMODE png_silent_error(png_structp png_ptr, png_const_charp WXUNUSED(message)) +PNGLINKAGEMODE wx_png_error(png_structp png_ptr, png_const_charp message) { + wxPNGInfoStruct *info = WX_PNG_INFO(png_ptr); + if ( info->verbose ) + wxLogError(wxString(message)); + #ifdef USE_FAR_KEYWORD - { - jmp_buf jmpbuf; - png_memcpy(jmpbuf,png_ptr->jmpbuf,sizeof(jmp_buf)); - longjmp(jmpbuf, 1); - } + { + jmp_buf jmpbuf; + png_memcpy(jmpbuf,info->jmpbuf,sizeof(jmp_buf)); + longjmp(jmpbuf, 1); + } #else - longjmp(png_ptr->jmpbuf, 1); + longjmp(info->jmpbuf, 1); #endif } void -LINKAGEMODE png_silent_warning(png_structp WXUNUSED(png_ptr), png_const_charp WXUNUSED(message)) +PNGLINKAGEMODE wx_png_warning(png_structp png_ptr, png_const_charp message) { + wxPNGInfoStruct *info = WX_PNG_INFO(png_ptr); + if ( info->verbose ) + wxLogWarning(wxString(message)); } +} // extern "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 wxPNGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) ) { // VZ: as this function uses setjmp() the only fool proof error handling @@ -100,7 +148,11 @@ bool wxPNGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose unsigned char **lines; unsigned int i; - png_infop info_ptr = (png_infop) NULL; + png_infop info_ptr = (png_infop) NULL; + wxPNGInfoStruct wxinfo; + + wxinfo.verbose = verbose; + wxinfo.stream.in = &stream; image->Destroy(); @@ -111,21 +163,22 @@ bool wxPNGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose if (!png_ptr) goto error_nolines; - // the file example.c explain how to guess if the stream is a png image - if (!verbose) png_set_error_fn(png_ptr, (png_voidp)NULL, png_silent_error, png_silent_warning); + png_set_error_fn(png_ptr, (png_voidp)NULL, wx_png_error, wx_png_warning); + + // NB: please see the comment near wxPNGInfoStruct declaration for + // explanation why this line is mandatory + png_set_read_fn( png_ptr, &wxinfo, _PNG_stream_reader); info_ptr = png_create_info_struct( png_ptr ); if (!info_ptr) goto error_nolines; - if (setjmp(png_ptr->jmpbuf)) + if (setjmp(wxinfo.jmpbuf)) goto error_nolines; if (info_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA) goto error_nolines; - png_set_read_fn( png_ptr, &stream, _PNG_stream_reader); - png_uint_32 width,height; int bit_depth,color_type,interlace_type; @@ -141,18 +194,18 @@ bool wxPNGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose png_set_expand( png_ptr ); png_set_filler( png_ptr, 0xff, PNG_FILLER_AFTER ); - image->Create( width, height ); + image->Create( (int)width, (int)height ); if (!image->Ok()) goto error_nolines; - lines = (unsigned char **)malloc( height * sizeof(unsigned char *) ); + lines = (unsigned char **)malloc( (size_t)(height * sizeof(unsigned char *)) ); if (lines == NULL) goto error_nolines; for (i = 0; i < height; i++) { - if ((lines[i] = (unsigned char *)malloc(width * (sizeof(unsigned char) * 4))) == NULL) + if ((lines[i] = (unsigned char *)malloc( (size_t)(width * (sizeof(unsigned char) * 4)))) == NULL) { for ( unsigned int n = 0; n < i; n++ ) free( lines[n] ); @@ -267,92 +320,108 @@ bool wxPNGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose return FALSE; } - bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose ) { - { - png_structp png_ptr = png_create_write_struct( PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); - if (!png_ptr) - { - return FALSE; - } + wxPNGInfoStruct wxinfo; - if (!verbose) png_set_error_fn(png_ptr, (png_voidp)NULL, png_silent_error, png_silent_warning); + wxinfo.verbose = verbose; + wxinfo.stream.out = &stream; - png_infop info_ptr = png_create_info_struct(png_ptr); - if (info_ptr == NULL) - { - png_destroy_write_struct( &png_ptr, (png_infopp)NULL ); - return FALSE; - } + png_structp png_ptr = png_create_write_struct( PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); + if (!png_ptr) + { + if (verbose) + wxLogError(_("Couldn't save PNG image.")); + return FALSE; + } - if (setjmp(png_ptr->jmpbuf)) - { - png_destroy_write_struct( &png_ptr, (png_infopp)NULL ); - return FALSE; - } + png_set_error_fn(png_ptr, (png_voidp)NULL, wx_png_error, wx_png_warning); - png_set_write_fn( png_ptr, &stream, _PNG_stream_writer, NULL); + png_infop info_ptr = png_create_info_struct(png_ptr); + if (info_ptr == NULL) + { + png_destroy_write_struct( &png_ptr, (png_infopp)NULL ); + if (verbose) + wxLogError(_("Couldn't save PNG image.")); + return FALSE; + } - png_set_IHDR( png_ptr, info_ptr, image->GetWidth(), image->GetHeight(), 8, - PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE, - PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); + if (setjmp(wxinfo.jmpbuf)) + { + png_destroy_write_struct( &png_ptr, (png_infopp)NULL ); + if (verbose) + wxLogError(_("Couldn't save PNG image.")); + return FALSE; + } - png_color_8 sig_bit; - sig_bit.red = 8; - sig_bit.green = 8; - sig_bit.blue = 8; - sig_bit.alpha = 8; - png_set_sBIT( png_ptr, info_ptr, &sig_bit ); - png_write_info( png_ptr, info_ptr ); - png_set_shift( png_ptr, &sig_bit ); - png_set_packing( png_ptr ); + // NB: please see the comment near wxPNGInfoStruct declaration for + // explanation why this line is mandatory + png_set_write_fn( png_ptr, &wxinfo, _PNG_stream_writer, NULL); + + png_set_IHDR( png_ptr, info_ptr, image->GetWidth(), image->GetHeight(), 8, + PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE, + PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); + + png_color_8 sig_bit; + sig_bit.red = 8; + sig_bit.green = 8; + sig_bit.blue = 8; + sig_bit.alpha = 8; + png_set_sBIT( png_ptr, info_ptr, &sig_bit ); + png_write_info( png_ptr, info_ptr ); + png_set_shift( png_ptr, &sig_bit ); + png_set_packing( png_ptr ); - unsigned char *data = (unsigned char *)malloc( image->GetWidth()*4 ); - if (!data) - { - png_destroy_write_struct( &png_ptr, (png_infopp)NULL ); - return FALSE; - } + unsigned char *data = (unsigned char *)malloc( image->GetWidth()*4 ); + if (!data) + { + png_destroy_write_struct( &png_ptr, (png_infopp)NULL ); + return FALSE; + } - for (int y = 0; y < image->GetHeight(); y++) + for (int y = 0; y < image->GetHeight(); y++) + { + unsigned char *ptr = image->GetData() + (y * image->GetWidth() * 3); + for (int x = 0; x < image->GetWidth(); x++) { - unsigned char *ptr = image->GetData() + (y * image->GetWidth() * 3); - for (int x = 0; x < image->GetWidth(); x++) + data[(x << 2) + 0] = *ptr++; + data[(x << 2) + 1] = *ptr++; + data[(x << 2) + 2] = *ptr++; + if (( !image->HasMask() ) || \ + (data[(x << 2) + 0] != image->GetMaskRed()) || \ + (data[(x << 2) + 1] != image->GetMaskGreen()) || \ + (data[(x << 2) + 2] != image->GetMaskBlue())) { - data[(x << 2) + 0] = *ptr++; - data[(x << 2) + 1] = *ptr++; - data[(x << 2) + 2] = *ptr++; - if (( !image->HasMask() ) || \ - (data[(x << 2) + 0] != image->GetMaskRed()) || \ - (data[(x << 2) + 1] != image->GetMaskGreen()) || \ - (data[(x << 2) + 2] != image->GetMaskBlue())) - { - data[(x << 2) + 3] = 255; - } - else - { - data[(x << 2) + 3] = 0; - } + data[(x << 2) + 3] = 255; + } + else + { + data[(x << 2) + 3] = 0; } - png_bytep row_ptr = data; - png_write_rows( png_ptr, &row_ptr, 1 ); } - - free(data); - png_write_end( png_ptr, info_ptr ); - png_destroy_write_struct( &png_ptr, (png_infopp)&info_ptr ); + png_bytep row_ptr = data; + png_write_rows( png_ptr, &row_ptr, 1 ); } + + free(data); + png_write_end( png_ptr, info_ptr ); + png_destroy_write_struct( &png_ptr, (png_infopp)&info_ptr ); + return TRUE; } +#ifdef __VISUALC__ + #pragma warning(default:4611) +#endif /* VC++ */ + bool wxPNGHandler::DoCanRead( wxInputStream& stream ) { unsigned char hdr[4]; - stream.Read(&hdr, 4); - stream.SeekI(-4, wxFromCurrent); - return (hdr[0] == 0x89 && hdr[1] == 'P' && hdr[2] == 'N' && hdr[3] == 'G'); + if ( !stream.Read(hdr, WXSIZEOF(hdr)) ) + return FALSE; + + return memcmp(hdr, "\211PNG", WXSIZEOF(hdr)) == 0; } #endif // wxUSE_STREAMS