// declarations
// ============================================================================
-#ifdef __GNUG__
-#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/app.h"
+ #include "wx/bitmap.h"
+ #include "wx/module.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>
// return the kind of transparency needed for this image assuming that it does
// have transparent pixels, i.e. either Transparency_Alpha or Transparency_Mask
static Transparency
-CheckTransparency(const unsigned char *ptr,
+CheckTransparency(unsigned char **lines,
png_uint_32 x, png_uint_32 y, png_uint_32 w, png_uint_32 h,
size_t numColBytes);
#if wxUSE_STREAMS
#ifndef PNGLINKAGEMODE
- #ifdef __WATCOMC__
+ #if defined(__WATCOMC__) && ( defined(__WXMSW__) || defined(__WXMGL__) )
// 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 _PNG_stream_reader( png_structp png_ptr, png_bytep data, png_size_t length )
+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 )
+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)
+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
- {
- jmp_buf jmpbuf;
- png_memcpy(jmpbuf,info->jmpbuf,sizeof(jmp_buf));
- longjmp(jmpbuf, 1);
- }
-#else
- longjmp(info->jmpbuf, 1);
-#endif
+ 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
void
-PNGLINKAGEMODE wx_png_warning(png_structp png_ptr, png_const_charp message)
+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"
// need a full blown alpha channel in wxImage
//
// parameters:
-// ptr the start of the data to examine
+// lines raw PNG data
// x, y starting position
// w, h size of the image
// numColBytes number of colour bytes (1 for grey scale, 3 for RGB)
// (NB: alpha always follows the colour bytes)
Transparency
-CheckTransparency(const unsigned char *ptr,
+CheckTransparency(unsigned char **lines,
png_uint_32 x, png_uint_32 y, png_uint_32 w, png_uint_32 h,
size_t numColBytes)
{
- // we start from (x + 1, y)
- x++;
-
// suppose that a mask will suffice and check all the remaining alpha
// values to see if it does
- unsigned const char *ptr2 = ptr;
- for ( png_uint_32 y2 = y; y2 < h; y2++ )
+ for ( ; y < h; y++ )
{
+ // each pixel is numColBytes+1 bytes, offset into the current line by
+ // the current x position
+ unsigned const char *ptr = lines[y] + (x * (numColBytes + 1));
+
for ( png_uint_32 x2 = x; x2 < w; x2++ )
{
// skip the grey or colour byte(s)
- ptr2 += numColBytes;
+ ptr += numColBytes;
- unsigned char a2 = *ptr2++;
+ unsigned char a2 = *ptr++;
if ( !IsTransparent(a2) && !IsOpaque(a2) )
{
unsigned char hdr[4];
if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
- return FALSE;
+ return false;
return memcmp(hdr, "\211PNG", WXSIZEOF(hdr)) == 0;
}
// only, otherwisewe need the latter
transparency = CheckTransparency
(
- ptrSrc,
+ lines,
x, y,
width, height,
1
{
transparency = CheckTransparency
(
- ptrSrc,
+ lines,
x, y,
width, height,
3
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
- 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") );
+ else // !transparent
+ {
+ // must be opaque then as otherwise we shouldn't be
+ // using the mask at all
+ wxASSERT_MSG( IsOpaque(a), _T("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++;
+ }
+ }
// fall through
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)
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_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;
free( lines[i] );
free( lines );
- return TRUE;
+ return true;
error:
if (verbose)
if ( lines )
{
+ for ( unsigned int n = 0; n < height; n++ )
+ free( lines[n] );
+
free( lines );
}
else
png_destroy_read_struct( &png_ptr, (png_infopp) NULL, (png_infopp) NULL );
}
- return FALSE;
+ return false;
}
// ----------------------------------------------------------------------------
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;
+
+ wxASSERT_MSG( iBitDepth == 8 || iBitDepth == 16,
+ _T("PNG bit depth must be 8 or 16") );
- 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);
+ 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;
+ }
+
+ 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;
+
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;
+ }
+
+ 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 )
+ {
+ uchMaskRed = image->GetMaskRed();
+ uchMaskGreen = image->GetMaskGreen();
+ uchMaskBlue = image->GetMaskBlue();
}
- for (int y = 0; y < image->GetHeight(); y++)
+ unsigned char *pColors = image->GetData();
+
+ for (int y = 0; y != iHeight; ++y)
{
- unsigned char *ptr = image->GetData() + (y * image->GetWidth() * 3);
- for (int x = 0; x < image->GetWidth(); x++)
+ 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( _T("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 );
}
png_write_end( png_ptr, info_ptr );
png_destroy_write_struct( &png_ptr, (png_infopp)&info_ptr );
- return TRUE;
+ return true;
}
#ifdef __VISUALC__
projects / wxWidgets.git / blobdiff