/////////////////////////////////////////////////////////////////////////////
-// Name: src/common/imagepng.cpp
+// Name: src/common/imagpng.cpp
// Purpose: wxImage PNG handler
// Author: Robert Roebling
// RCS-ID: $Id$
// declarations
// ============================================================================
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-#pragma implementation "imagpng.h"
-#endif
-
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
#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 <string.h>
-#ifdef __SALFORDC__
-#ifdef FAR
-#undef FAR
-#endif
-#endif
-
// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------
#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
extern "C"
{
-void PNGLINKAGEMODE wx_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 wx_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 WXUNUSED(png_ptr), png_const_charp message)
-{
- wxLogFatalError( wxString::FromAscii(message) );
-}
-
-void
+static void
PNGLINKAGEMODE wx_png_warning(png_structp png_ptr, png_const_charp message)
{
wxPNGInfoStruct *info = png_ptr ? WX_PNG_INFO(png_ptr) : NULL;
if ( !info || info->verbose )
+ {
wxLogWarning( wxString::FromAscii(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)
+{
+ 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"
r2 = *p++;
g2 = *p++;
b2 = *p++;
+ ++p; // jump over alpha
wxImageHistogramEntry&
entry = h[wxImageHistogram:: MakeKey(r2, g2, b2)];
{
unsigned char hdr[4];
- if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
+ if ( !stream.Read(hdr, WXSIZEOF(hdr)) ) // it's ok to modify the stream position here
return false;
return memcmp(hdr, "\211PNG", WXSIZEOF(hdr)) == 0;
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
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") );
// if we couldn't find a unique colour for the
// mask, we can have real pixels with the same
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;
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 );
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
error:
if (verbose)
+ {
wxLogError(_("Couldn't load a PNG image - file is corrupted or not enough memory."));
+ }
if ( image->Ok() )
{
if ( lines )
{
+ for ( unsigned int n = 0; n < height; n++ )
+ free( lines[n] );
+
free( lines );
}
if (!png_ptr)
{
if (verbose)
+ {
wxLogError(_("Couldn't save PNG image."));
+ }
return false;
}
{
png_destroy_write_struct( &png_ptr, (png_infopp)NULL );
if (verbose)
+ {
wxLogError(_("Couldn't save PNG image."));
+ }
return false;
}
{
png_destroy_write_struct( &png_ptr, (png_infopp)NULL );
if (verbose)
+ {
wxLogError(_("Couldn't save PNG image."));
+ }
return false;
}
? image->GetOptionInt(wxIMAGE_OPTION_PNG_BITDEPTH)
: 8;
- wxASSERT_MSG( iBitDepth == 8 || iBitDepth == 16,
- _T("PNG bit depth must be 8 or 16") );
-
bool bHasAlpha = image->HasAlpha();
bool bHasMask = image->HasMask();
bool bUseAlpha = bHasAlpha || bHasMask;
: 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) );
+
+ 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,
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 );
switch ( iColorType )
{
default:
- wxFAIL_MSG( _T("unknown wxPNG_TYPE_XXX") );
+ wxFAIL_MSG( wxT("unknown wxPNG_TYPE_XXX") );
// fall through
case wxPNG_TYPE_COLOUR:
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