X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/14f355c2b5c71fc7c3d680aea366582d2ac60f7b..29a35dd5fee0e33143a39824e71aefd66e3e4851:/src/common/imagpng.cpp diff --git a/src/common/imagpng.cpp b/src/common/imagpng.cpp index 151d3c9986..14fd9eddb1 100644 --- a/src/common/imagpng.cpp +++ b/src/common/imagpng.cpp @@ -1,5 +1,5 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: src/common/imagepng.cpp +// Name: src/common/imagpng.cpp // Purpose: wxImage PNG handler // Author: Robert Roebling // RCS-ID: $Id$ @@ -11,10 +11,6 @@ // declarations // ============================================================================ -#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) -#pragma implementation "imagpng.h" -#endif - // ---------------------------------------------------------------------------- // headers // ---------------------------------------------------------------------------- @@ -23,35 +19,25 @@ #include "wx/wxprec.h" #ifdef __BORLANDC__ - #pragma hdrstop -#endif - -#ifndef WX_PRECOMP - #include "wx/defs.h" + #pragma hdrstop #endif #if wxUSE_IMAGE && wxUSE_LIBPNG #include "wx/imagpng.h" -#include "wx/bitmap.h" -#include "wx/debug.h" -#include "wx/log.h" -#include "wx/app.h" + +#ifndef WX_PRECOMP + #include "wx/log.h" + #include "wx/intl.h" + #include "wx/palette.h" + #include "wx/stream.h" +#endif + #include "png.h" -#include "wx/filefn.h" -#include "wx/wfstream.h" -#include "wx/intl.h" -#include "wx/module.h" // For memcpy #include -#ifdef __SALFORDC__ -#ifdef FAR -#undef FAR -#endif -#endif - // ---------------------------------------------------------------------------- // constants // ---------------------------------------------------------------------------- @@ -109,7 +95,9 @@ IMPLEMENT_DYNAMIC_CLASS(wxPNGHandler,wxImageHandler) #if wxUSE_STREAMS #ifndef PNGLINKAGEMODE - #ifdef __WATCOMC__ + #ifdef PNGAPI + #define PNGLINKAGEMODE PNGAPI + #elif defined(__WATCOMC__) // we need an explicit cdecl for Watcom, at least according to // // http://sf.net/tracker/index.php?func=detail&aid=651492&group_id=9863&atid=109863 @@ -160,42 +148,39 @@ struct wxPNGInfoStruct extern "C" { -void PNGLINKAGEMODE _PNG_stream_reader( png_structp png_ptr, png_bytep data, png_size_t length ) +static void PNGLINKAGEMODE wx_PNG_stream_reader( png_structp png_ptr, png_bytep data, + png_size_t length ) { WX_PNG_INFO(png_ptr)->stream.in->Read(data, length); } -void PNGLINKAGEMODE _PNG_stream_writer( png_structp png_ptr, png_bytep data, png_size_t length ) +static void PNGLINKAGEMODE wx_PNG_stream_writer( png_structp png_ptr, png_bytep data, + png_size_t 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 -PNGLINKAGEMODE wx_png_error(png_structp png_ptr, png_const_charp message) +static void +PNGLINKAGEMODE wx_png_warning(png_structp png_ptr, png_const_charp message) { - wxPNGInfoStruct *info = WX_PNG_INFO(png_ptr); - if (info->verbose) - wxLogError( wxString::FromAscii(message) ); - -#ifdef USE_FAR_KEYWORD + wxPNGInfoStruct *info = png_ptr ? WX_PNG_INFO(png_ptr) : NULL; + if ( !info || info->verbose ) { - jmp_buf jmpbuf; - png_memcpy(jmpbuf,info->jmpbuf,sizeof(jmp_buf)); - longjmp(jmpbuf, 1); + wxLogWarning( wxString::FromAscii(message) ); } -#else - longjmp(info->jmpbuf, 1); -#endif } -void -PNGLINKAGEMODE wx_png_warning(png_structp png_ptr, png_const_charp message) +// from pngerror.c +// so that the libpng doesn't send anything on stderr +static void +PNGLINKAGEMODE wx_png_error(png_structp png_ptr, png_const_charp message) { - wxPNGInfoStruct *info = WX_PNG_INFO(png_ptr); - if (info->verbose) - wxLogWarning( wxString::FromAscii(message) ); + wx_png_warning(NULL, message); + + // we're not using libpng built-in jump buffer (see comment before + // wxPNGInfoStruct above) so we have to return ourselves, otherwise libpng + // would just abort + longjmp(WX_PNG_INFO(png_ptr)->jmpbuf, 1); } } // extern "C" @@ -288,6 +273,7 @@ FindMaskColour(unsigned char **lines, png_uint_32 width, png_uint_32 height, r2 = *p++; g2 = *p++; b2 = *p++; + ++p; // jump over alpha wxImageHistogramEntry& entry = h[wxImageHistogram:: MakeKey(r2, g2, b2)]; @@ -318,8 +304,8 @@ bool wxPNGHandler::DoCanRead( wxInputStream& stream ) { unsigned char hdr[4]; - if ( !stream.Read(hdr, WXSIZEOF(hdr)) ) - return FALSE; + if ( !stream.Read(hdr, WXSIZEOF(hdr)) ) // it's ok to modify the stream position here + return false; return memcmp(hdr, "\211PNG", WXSIZEOF(hdr)) == 0; } @@ -393,15 +379,15 @@ void CopyDataFromPNG(wxImage *image, if ( IsTransparent(a) ) { *ptrDst++ = rMask; - *ptrDst++ = bMask; *ptrDst++ = gMask; + *ptrDst++ = bMask; break; } // else: !transparent // must be opaque then as otherwise we shouldn't be // using the mask at all - wxASSERT_MSG( IsOpaque(a), _T("logic error") ); + wxASSERT_MSG( IsOpaque(a), wxT("logic error") ); // fall through @@ -460,25 +446,27 @@ void CopyDataFromPNG(wxImage *image, case Transparency_Mask: if ( IsTransparent(a) ) { - // if we couldn't find a unique colour for the mask, we - // can have real pixels with the same value as the mask - // and it's better to slightly change their colour than - // to make them transparent + *ptrDst++ = rMask; + *ptrDst++ = gMask; + *ptrDst++ = bMask; + break; + } + else // !transparent + { + // must be opaque then as otherwise we shouldn't be + // using the mask at all + wxASSERT_MSG( IsOpaque(a), wxT("logic error") ); + + // if we couldn't find a unique colour for the + // mask, we can have real pixels with the same + // value as the mask and it's better to slightly + // change their colour than to make them + // transparent if ( r == rMask && g == gMask && b == bMask ) { r++; } - - *ptrDst++ = rMask; - *ptrDst++ = bMask; - *ptrDst++ = gMask; - break; } - // else: !transparent - - // must be opaque then as otherwise we shouldn't be - // using the mask at all - wxASSERT_MSG( IsOpaque(a), _T("logic error") ); // fall through @@ -515,30 +503,34 @@ wxPNGHandler::LoadFile(wxImage *image, bool verbose, int WXUNUSED(index)) { - // VZ: as this function uses setjmp() the only fool proof error handling + // VZ: as this function uses setjmp() the only fool-proof error handling // method is to use goto (setjmp is not really C++ dtors friendly...) unsigned char **lines = NULL; png_infop info_ptr = (png_infop) NULL; wxPNGInfoStruct wxinfo; + png_uint_32 i, width, height = 0; + int bit_depth, color_type, interlace_type; + wxinfo.verbose = verbose; wxinfo.stream.in = &stream; image->Destroy(); - png_structp png_ptr = png_create_read_struct( PNG_LIBPNG_VER_STRING, - (voidp) NULL, - (png_error_ptr) NULL, - (png_error_ptr) NULL ); + png_structp png_ptr = png_create_read_struct + ( + PNG_LIBPNG_VER_STRING, + (voidp) NULL, + wx_png_error, + wx_png_warning + ); if (!png_ptr) goto error; - 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); + png_set_read_fn( png_ptr, &wxinfo, wx_PNG_stream_reader); info_ptr = png_create_info_struct( png_ptr ); if (!info_ptr) @@ -547,11 +539,8 @@ wxPNGHandler::LoadFile(wxImage *image, if (setjmp(wxinfo.jmpbuf)) goto error; - png_uint_32 i, width, height; - int bit_depth, color_type, interlace_type; - png_read_info( png_ptr, info_ptr ); - png_get_IHDR( png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &interlace_type, (int*) NULL, (int*) NULL ); + png_get_IHDR( png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &interlace_type, NULL, NULL ); if (color_type == PNG_COLOR_TYPE_PALETTE) png_set_expand( png_ptr ); @@ -566,27 +555,48 @@ wxPNGHandler::LoadFile(wxImage *image, png_set_expand( png_ptr ); png_set_filler( png_ptr, 0xff, PNG_FILLER_AFTER ); - image->Create( (int)width, (int)height ); + image->Create((int)width, (int)height, (bool) false /* no need to init pixels */); if (!image->Ok()) goto error; - lines = (unsigned char **)malloc( (size_t)(height * sizeof(unsigned char *)) ); + // initialize all line pointers to NULL to ensure that they can be safely + // free()d if an error occurs before all of them could be allocated + lines = (unsigned char **)calloc(height, sizeof(unsigned char *)); if ( !lines ) goto error; for (i = 0; i < height; i++) { 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] ); goto error; - } } png_read_image( png_ptr, lines ); png_read_end( png_ptr, info_ptr ); + +#if wxUSE_PALETTE + if (color_type == PNG_COLOR_TYPE_PALETTE) + { + const size_t ncolors = info_ptr->num_palette; + unsigned char* r = new unsigned char[ncolors]; + unsigned char* g = new unsigned char[ncolors]; + unsigned char* b = new unsigned char[ncolors]; + + for (size_t j = 0; j < ncolors; j++) + { + r[j] = info_ptr->palette[j].red; + g[j] = info_ptr->palette[j].green; + b[j] = info_ptr->palette[j].blue; + } + + image->SetPalette(wxPalette(ncolors, r, g, b)); + delete[] r; + delete[] g; + delete[] b; + } +#endif // wxUSE_PALETTE + png_destroy_read_struct( &png_ptr, &info_ptr, (png_infopp) NULL ); // loaded successfully, now init wxImage with this data @@ -596,11 +606,13 @@ wxPNGHandler::LoadFile(wxImage *image, free( lines[i] ); free( lines ); - return TRUE; + return true; error: if (verbose) + { wxLogError(_("Couldn't load a PNG image - file is corrupted or not enough memory.")); + } if ( image->Ok() ) { @@ -609,6 +621,9 @@ error: if ( lines ) { + for ( unsigned int n = 0; n < height; n++ ) + free( lines[n] ); + free( lines ); } @@ -622,7 +637,7 @@ error: else png_destroy_read_struct( &png_ptr, (png_infopp) NULL, (png_infopp) NULL ); } - return FALSE; + return false; } // ---------------------------------------------------------------------------- @@ -636,78 +651,240 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos wxinfo.verbose = verbose; wxinfo.stream.out = &stream; - png_structp png_ptr = png_create_write_struct( PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); + png_structp png_ptr = png_create_write_struct + ( + PNG_LIBPNG_VER_STRING, + NULL, + wx_png_error, + wx_png_warning + ); if (!png_ptr) { if (verbose) + { wxLogError(_("Couldn't save PNG image.")); - return FALSE; + } + return false; } - png_set_error_fn(png_ptr, (png_voidp)NULL, wx_png_error, wx_png_warning); - 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; + } + return false; } if (setjmp(wxinfo.jmpbuf)) { png_destroy_write_struct( &png_ptr, (png_infopp)NULL ); if (verbose) + { wxLogError(_("Couldn't save PNG image.")); - return FALSE; + } + return false; } // 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_write_fn( png_ptr, &wxinfo, wx_PNG_stream_writer, NULL); + + const int iColorType = image->HasOption(wxIMAGE_OPTION_PNG_FORMAT) + ? image->GetOptionInt(wxIMAGE_OPTION_PNG_FORMAT) + : wxPNG_TYPE_COLOUR; + const int iBitDepth = image->HasOption(wxIMAGE_OPTION_PNG_BITDEPTH) + ? image->GetOptionInt(wxIMAGE_OPTION_PNG_BITDEPTH) + : 8; + + bool bHasAlpha = image->HasAlpha(); + bool bHasMask = image->HasMask(); + bool bUseAlpha = bHasAlpha || bHasMask; + + int iPngColorType; + if ( iColorType==wxPNG_TYPE_COLOUR ) + { + iPngColorType = bUseAlpha ? PNG_COLOR_TYPE_RGB_ALPHA + : PNG_COLOR_TYPE_RGB; + } + else + { + iPngColorType = bUseAlpha ? PNG_COLOR_TYPE_GRAY_ALPHA + : PNG_COLOR_TYPE_GRAY; + } + + if (image->HasOption(wxIMAGE_OPTION_PNG_FILTER)) + png_set_filter( png_ptr, PNG_FILTER_TYPE_BASE, image->GetOptionInt(wxIMAGE_OPTION_PNG_FILTER) ); + + if (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_LEVEL)) + png_set_compression_level( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_LEVEL) ); + + if (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_MEM_LEVEL)) + png_set_compression_mem_level( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_MEM_LEVEL) ); + + if (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_STRATEGY)) + png_set_compression_strategy( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_STRATEGY) ); - 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 (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_BUFFER_SIZE)) + png_set_compression_buffer_size( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_BUFFER_SIZE) ); + png_set_IHDR( png_ptr, info_ptr, image->GetWidth(), image->GetHeight(), + iBitDepth, iPngColorType, + PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, + PNG_FILTER_TYPE_BASE); + + int iElements; png_color_8 sig_bit; - sig_bit.red = 8; - sig_bit.green = 8; - sig_bit.blue = 8; - sig_bit.alpha = 8; + + if ( iPngColorType & PNG_COLOR_MASK_COLOR ) + { + sig_bit.red = + sig_bit.green = + sig_bit.blue = (png_byte)iBitDepth; + iElements = 3; + } + else // grey + { + sig_bit.gray = (png_byte)iBitDepth; + iElements = 1; + } + + if ( iPngColorType & PNG_COLOR_MASK_ALPHA ) + { + sig_bit.alpha = (png_byte)iBitDepth; + iElements++; + } + + if ( iBitDepth == 16 ) + iElements *= 2; + + // save the image resolution if we have it + int resX, resY; + switch ( GetResolutionFromOptions(*image, &resX, &resY) ) + { + case wxIMAGE_RESOLUTION_INCHES: + { + const double INCHES_IN_METER = 10000.0 / 254; + resX = int(resX * INCHES_IN_METER); + resY = int(resY * INCHES_IN_METER); + } + break; + + case wxIMAGE_RESOLUTION_CM: + resX *= 100; + resY *= 100; + break; + + case wxIMAGE_RESOLUTION_NONE: + break; + + default: + wxFAIL_MSG( wxT("unsupported image resolution units") ); + } + + if ( resX && resY ) + png_set_pHYs( png_ptr, info_ptr, resX, resY, PNG_RESOLUTION_METER ); + 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) + unsigned char * + data = (unsigned char *)malloc( image->GetWidth() * iElements ); + if ( !data ) { png_destroy_write_struct( &png_ptr, (png_infopp)NULL ); - return FALSE; + return false; } - for (int y = 0; y < image->GetHeight(); y++) + unsigned char * + pAlpha = (unsigned char *)(bHasAlpha ? image->GetAlpha() : NULL); + int iHeight = image->GetHeight(); + int iWidth = image->GetWidth(); + + unsigned char uchMaskRed = 0, uchMaskGreen = 0, uchMaskBlue = 0; + + if ( bHasMask ) { - unsigned char *ptr = image->GetData() + (y * image->GetWidth() * 3); - for (int x = 0; x < image->GetWidth(); x++) + uchMaskRed = image->GetMaskRed(); + uchMaskGreen = image->GetMaskGreen(); + uchMaskBlue = image->GetMaskBlue(); + } + + unsigned char *pColors = image->GetData(); + + for (int y = 0; y != iHeight; ++y) + { + unsigned char *pData = data; + for (int x = 0; x != iWidth; 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())) + unsigned char uchRed = *pColors++; + unsigned char uchGreen = *pColors++; + unsigned char uchBlue = *pColors++; + + switch ( iColorType ) { - data[(x << 2) + 3] = 255; + default: + wxFAIL_MSG( wxT("unknown wxPNG_TYPE_XXX") ); + // fall through + + case wxPNG_TYPE_COLOUR: + *pData++ = uchRed; + if ( iBitDepth == 16 ) + *pData++ = 0; + *pData++ = uchGreen; + if ( iBitDepth == 16 ) + *pData++ = 0; + *pData++ = uchBlue; + if ( iBitDepth == 16 ) + *pData++ = 0; + break; + + case wxPNG_TYPE_GREY: + { + // where do these coefficients come from? maybe we + // should have image options for them as well? + unsigned uiColor = + (unsigned) (76.544*(unsigned)uchRed + + 150.272*(unsigned)uchGreen + + 36.864*(unsigned)uchBlue); + + *pData++ = (unsigned char)((uiColor >> 8) & 0xFF); + if ( iBitDepth == 16 ) + *pData++ = (unsigned char)(uiColor & 0xFF); + } + break; + + case wxPNG_TYPE_GREY_RED: + *pData++ = uchRed; + if ( iBitDepth == 16 ) + *pData++ = 0; + break; } - else + + if ( bUseAlpha ) { - data[(x << 2) + 3] = 0; + unsigned char uchAlpha = 255; + if ( bHasAlpha ) + uchAlpha = *pAlpha++; + + if ( bHasMask ) + { + if ( (uchRed == uchMaskRed) + && (uchGreen == uchMaskGreen) + && (uchBlue == uchMaskBlue) ) + uchAlpha = 0; + } + + *pData++ = uchAlpha; + if ( iBitDepth == 16 ) + *pData++ = 0; } } + png_bytep row_ptr = data; png_write_rows( png_ptr, &row_ptr, 1 ); } @@ -716,7 +893,7 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos png_write_end( png_ptr, info_ptr ); png_destroy_write_struct( &png_ptr, (png_infopp)&info_ptr ); - return TRUE; + return true; } #ifdef __VISUALC__