/////////////////////////////////////////////////////////////////////////////
-// Name: src/common/imagepng.cpp
+// Name: src/common/imagpng.cpp
// Purpose: wxImage PNG handler
// Author: Robert Roebling
// RCS-ID: $Id$
// 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"
+#include "wx/versioninfo.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
// ----------------------------------------------------------------------------
-// image can not have any transparent pixels at all, have only 100% opaque
+// image cannot have any transparent pixels at all, have only 100% opaque
// and/or 100% transparent pixels in which case a simple mask is enough to
// store this information in wxImage or have a real alpha channel in which case
// we need to have it in wxImage as well
// 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,
- png_uint_32 x, png_uint_32 y, png_uint_32 w, png_uint_32 h);
+CheckTransparency(unsigned char **lines,
+ png_uint_32 x, png_uint_32 y, png_uint_32 w, png_uint_32 h,
+ size_t numColBytes);
// init the alpha channel for the image and fill it with 1s up to (x, y)
static unsigned char *InitAlpha(wxImage *image, png_uint_32 x, png_uint_32 y);
FindMaskColour(unsigned char **lines, png_uint_32 width, png_uint_32 height,
unsigned char& rMask, unsigned char& gMask, unsigned char& bMask);
+// is the pixel with this value of alpha a fully opaque one?
+static inline
+bool IsOpaque(unsigned char a)
+{
+ return a == 0xff;
+}
+
+// is the pixel with this value of alpha a fully transparent one?
+static inline
+bool IsTransparent(unsigned char a)
+{
+ return !a;
+}
+
// ============================================================================
// wxPNGHandler implementation
// ============================================================================
#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
// 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.
+// as DLL with another compiler than the main executable, it may not work.
+// 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
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"
// LoadFile() helpers
// ----------------------------------------------------------------------------
+// determine the kind of transparency we need for this image: if the only alpha
+// values it has are 0 (transparent) and 0xff (opaque) then we can simply
+// create a mask for it, we should be ok with a simple mask but otherwise we
+// need a full blown alpha channel in wxImage
+//
+// parameters:
+// 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,
- png_uint_32 x, png_uint_32 y, png_uint_32 w, png_uint_32 h)
+CheckTransparency(unsigned char **lines,
+ png_uint_32 x, png_uint_32 y, png_uint_32 w, png_uint_32 h,
+ size_t numColBytes)
{
- // suppose that a mask will suffice
- Transparency transparency = Transparency_Mask;
-
- // and check all the remaining alpha values to see if it does
- unsigned char a2;
- unsigned const char *ptr2 = ptr;
- for ( png_uint_32 y2 = y; y2 < h; y2++ )
+ // suppose that a mask will suffice and check all the remaining alpha
+ // values to see if it does
+ for ( ; y < h; y++ )
{
- for ( png_uint_32 x2 = x + 1; x2 < w; x2++ )
+ // 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 byte
- a2 = *++ptr2;
+ // skip the grey or colour byte(s)
+ ptr += numColBytes;
+
+ unsigned char a2 = *ptr++;
- if ( a2 && a2 != 0xff )
+ if ( !IsTransparent(a2) && !IsOpaque(a2) )
{
- // not fully opeaque nor fully transparent, hence need alpha
- transparency = Transparency_Alpha;
- break;
+ // not fully opaque nor fully transparent, hence need alpha
+ return Transparency_Alpha;
}
-
- ++ptr2;
}
- if ( transparency == Transparency_Alpha )
- {
- // no need to continue
- break;
- }
+ // during the next loop iteration check all the pixels in the row
+ x = 0;
}
- return transparency;
+ // mask will be enough
+ return Transparency_Mask;
}
unsigned char *InitAlpha(wxImage *image, png_uint_32 x, png_uint_32 y)
unsigned char *alpha = image->GetAlpha();
// set alpha for the pixels we had so far
- for ( png_uint_32 y2 = 0; y2 <= y; y2++ )
+ png_uint_32 end = y * image->GetWidth() + x;
+ for ( png_uint_32 i = 0; i < end; i++ )
{
- for ( png_uint_32 x2 = 0; x2 < x; x2++ )
- {
- // all the previous pixels were opaque
- *alpha++ = 0xff;
- }
+ // all the previous pixels were opaque
+ *alpha++ = 0xff;
}
return alpha;
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)) )
- 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;
}
// the first time we encounter a transparent pixel we must
// decide about what to do about them
- if ( a != 0xff && transparency == Transparency_None )
+ if ( !IsOpaque(a) && transparency == Transparency_None )
{
// we'll need at least the mask for this image and
// maybe even full alpha channel info: the former is
// only enough if we have alpha values of 0 and 0xff
// only, otherwisewe need the latter
- transparency = CheckTransparency(ptrSrc, x, y,
- width, height);
+ transparency = CheckTransparency
+ (
+ lines,
+ x, y,
+ width, height,
+ 1
+ );
if ( transparency == Transparency_Mask )
{
switch ( transparency )
{
+ case Transparency_Mask:
+ if ( IsTransparent(a) )
+ {
+ *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") );
+
+ // fall through
+
case Transparency_Alpha:
- *alpha++ = a;
+ if ( alpha )
+ *alpha++ = a;
// fall through
case Transparency_None:
*ptrDst++ = g;
*ptrDst++ = g;
break;
-
- case Transparency_Mask:
- *ptrDst++ = rMask;
- *ptrDst++ = bMask;
- *ptrDst++ = gMask;
}
}
}
// the logic here is the same as for the grey case except
// where noted
- if ( a != 0xff && transparency == Transparency_None )
+ if ( !IsOpaque(a) && transparency == Transparency_None )
{
- transparency = CheckTransparency(ptrSrc, x, y,
- width, height);
+ transparency = CheckTransparency
+ (
+ lines,
+ x, y,
+ width, height,
+ 3
+ );
if ( transparency == Transparency_Mask )
{
switch ( transparency )
{
+ case Transparency_Mask:
+ if ( IsTransparent(a) )
+ {
+ *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++;
+ }
+ }
+
+ // fall through
+
case Transparency_Alpha:
- *alpha++ = a;
+ if ( alpha )
+ *alpha++ = a;
// fall through
case Transparency_None:
*ptrDst++ = g;
*ptrDst++ = b;
break;
-
- case Transparency_Mask:
- // 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;
}
}
}
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,
+ 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_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 );
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())
+ if (!image->IsOk())
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)
+ {
+ png_colorp palette = NULL;
+ int numPalette = 0;
+
+ (void) png_get_PLTE(png_ptr, info_ptr, &palette, &numPalette);
+
+ unsigned char* r = new unsigned char[numPalette];
+ unsigned char* g = new unsigned char[numPalette];
+ unsigned char* b = new unsigned char[numPalette];
+
+ for (int j = 0; j < numPalette; j++)
+ {
+ r[j] = palette[j].red;
+ g[j] = palette[j].green;
+ b[j] = palette[j].blue;
+ }
+
+ image->SetPalette(wxPalette(numPalette, r, g, b));
+ delete[] r;
+ delete[] g;
+ delete[] b;
+ }
+#endif // wxUSE_PALETTE
+
+
+ // set the image resolution if it's available
+ png_uint_32 resX, resY;
+ int unitType;
+ if (png_get_pHYs(png_ptr, info_ptr, &resX, &resY, &unitType)
+ == PNG_INFO_pHYs)
+ {
+ wxImageResolution res = wxIMAGE_RESOLUTION_CM;
+
+ switch (unitType)
+ {
+ default:
+ wxLogWarning(_("Unknown PNG resolution unit %d"), unitType);
+ // fall through
+
+ case PNG_RESOLUTION_UNKNOWN:
+ image->SetOption(wxIMAGE_OPTION_RESOLUTIONX, resX);
+ image->SetOption(wxIMAGE_OPTION_RESOLUTIONY, resY);
+
+ res = wxIMAGE_RESOLUTION_NONE;
+ break;
+
+ case PNG_RESOLUTION_METER:
+ /*
+ Convert meters to centimeters.
+ Use a string to not lose precision (converting to cm and then
+ to inch would result in integer rounding error).
+ If an app wants an int, GetOptionInt will convert and round
+ down for them.
+ */
+ image->SetOption(wxIMAGE_OPTION_RESOLUTIONX,
+ wxString::FromCDouble((double) resX / 100.0, 2));
+ image->SetOption(wxIMAGE_OPTION_RESOLUTIONY,
+ wxString::FromCDouble((double) resY / 100.0, 2));
+ break;
+ }
+
+ image->SetOption(wxIMAGE_OPTION_RESOLUTIONUNIT, res);
+ }
+
+
png_destroy_read_struct( &png_ptr, &info_ptr, (png_infopp) NULL );
// loaded successfully, now init wxImage with this data
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() )
+ if ( image->IsOk() )
{
image->Destroy();
}
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;
+}
+
+// ----------------------------------------------------------------------------
+// SaveFile() palette helpers
+// ----------------------------------------------------------------------------
+
+typedef wxLongToLongHashMap PaletteMap;
+
+static unsigned long PaletteMakeKey(const png_color_8& clr)
+{
+ return (wxImageHistogram::MakeKey(clr.red, clr.green, clr.blue) << 8) | clr.alpha;
+}
+
+static long PaletteFind(const PaletteMap& palette, const png_color_8& clr)
+{
+ unsigned long value = PaletteMakeKey(clr);
+ PaletteMap::const_iterator it = palette.find(value);
+
+ return (it != palette.end()) ? it->second : wxNOT_FOUND;
+}
+
+static long PaletteAdd(PaletteMap *palette, const png_color_8& clr)
+{
+ unsigned long value = PaletteMakeKey(clr);
+ PaletteMap::const_iterator it = palette->find(value);
+ size_t index;
+
+ if (it == palette->end())
+ {
+ index = palette->size();
+ (*palette)[value] = index;
+ }
+ else
+ {
+ index = it->second;
+ }
+
+ return index;
}
// ----------------------------------------------------------------------------
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 iHeight = image->GetHeight();
+ const int iWidth = image->GetWidth();
+
+ const bool bHasPngFormatOption
+ = image->HasOption(wxIMAGE_OPTION_PNG_FORMAT);
+
+ int iColorType = bHasPngFormatOption
+ ? image->GetOptionInt(wxIMAGE_OPTION_PNG_FORMAT)
+ : wxPNG_TYPE_COLOUR;
+
+ bool bHasAlpha = image->HasAlpha();
+ bool bHasMask = image->HasMask();
+
+ bool bUsePalette = iColorType == wxPNG_TYPE_PALETTE
+#if wxUSE_PALETTE
+ || (!bHasPngFormatOption && image->HasPalette() )
+#endif
+ ;
+
+ png_color_8 mask = { 0, 0, 0, 0, 0 };
+
+ if (bHasMask)
+ {
+ mask.red = image->GetMaskRed();
+ mask.green = image->GetMaskGreen();
+ mask.blue = image->GetMaskBlue();
+ }
- 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);
+ PaletteMap palette;
+ if (bUsePalette)
+ {
+ png_color png_rgb [PNG_MAX_PALETTE_LENGTH];
+ png_byte png_trans[PNG_MAX_PALETTE_LENGTH];
+
+ const unsigned char *pColors = image->GetData();
+ const unsigned char* pAlpha = image->GetAlpha();
+
+ if (bHasMask && !pAlpha)
+ {
+ // Mask must be first
+ PaletteAdd(&palette, mask);
+ }
+
+ for (int y = 0; y < iHeight; y++)
+ {
+ for (int x = 0; x < iWidth; x++)
+ {
+ png_color_8 rgba;
+
+ rgba.red = *pColors++;
+ rgba.green = *pColors++;
+ rgba.blue = *pColors++;
+ rgba.gray = 0;
+ rgba.alpha = (pAlpha && !bHasMask) ? *pAlpha++ : 0;
+
+ // save in our palette
+ long index = PaletteAdd(&palette, rgba);
+
+ if (index < PNG_MAX_PALETTE_LENGTH)
+ {
+ // save in libpng's palette
+ png_rgb[index].red = rgba.red;
+ png_rgb[index].green = rgba.green;
+ png_rgb[index].blue = rgba.blue;
+ png_trans[index] = rgba.alpha;
+ }
+ else
+ {
+ bUsePalette = false;
+ break;
+ }
+ }
+ }
+
+ if (bUsePalette)
+ {
+ png_set_PLTE(png_ptr, info_ptr, png_rgb, palette.size());
+
+ if (bHasMask && !pAlpha)
+ {
+ wxASSERT(PaletteFind(palette, mask) == 0);
+ png_trans[0] = 0;
+ png_set_tRNS(png_ptr, info_ptr, png_trans, 1, NULL);
+ }
+ else if (pAlpha && !bHasMask)
+ {
+ png_set_tRNS(png_ptr, info_ptr, png_trans, palette.size(), NULL);
+ }
+ }
+ }
+
+ /*
+ If saving palettised was requested but it was decided we can't use a
+ palette then reset the colour type to RGB.
+ */
+ if (!bUsePalette && iColorType == wxPNG_TYPE_PALETTE)
+ {
+ iColorType = wxPNG_TYPE_COLOUR;
+ }
+
+ bool bUseAlpha = !bUsePalette && (bHasAlpha || bHasMask);
+
+ int iPngColorType;
+
+ if (bUsePalette)
+ {
+ iPngColorType = PNG_COLOR_TYPE_PALETTE;
+ iColorType = wxPNG_TYPE_PALETTE;
+ }
+ else 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) );
+
+ if (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_BUFFER_SIZE))
+ png_set_compression_buffer_size( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_BUFFER_SIZE) );
+
+ int iBitDepth = !bUsePalette && image->HasOption(wxIMAGE_OPTION_PNG_BITDEPTH)
+ ? image->GetOptionInt(wxIMAGE_OPTION_PNG_BITDEPTH)
+ : 8;
+
+ 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 ( bUseAlpha )
+ {
+ 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++)
+ const unsigned char *
+ pAlpha = (const unsigned char *)(bHasAlpha ? image->GetAlpha() : NULL);
+
+ const 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()))
+ png_color_8 clr;
+ clr.red = *pColors++;
+ clr.green = *pColors++;
+ clr.blue = *pColors++;
+ clr.gray = 0;
+ clr.alpha = (bUsePalette && pAlpha) ? *pAlpha++ : 0; // use with wxPNG_TYPE_PALETTE only
+
+ switch ( iColorType )
{
- data[(x << 2) + 3] = 255;
+ default:
+ wxFAIL_MSG( wxT("unknown wxPNG_TYPE_XXX") );
+ // fall through
+
+ case wxPNG_TYPE_COLOUR:
+ *pData++ = clr.red;
+ if ( iBitDepth == 16 )
+ *pData++ = 0;
+ *pData++ = clr.green;
+ if ( iBitDepth == 16 )
+ *pData++ = 0;
+ *pData++ = clr.blue;
+ 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)clr.red +
+ 150.272*(unsigned)clr.green +
+ 36.864*(unsigned)clr.blue);
+
+ *pData++ = (unsigned char)((uiColor >> 8) & 0xFF);
+ if ( iBitDepth == 16 )
+ *pData++ = (unsigned char)(uiColor & 0xFF);
+ }
+ break;
+
+ case wxPNG_TYPE_GREY_RED:
+ *pData++ = clr.red;
+ if ( iBitDepth == 16 )
+ *pData++ = 0;
+ break;
+
+ case wxPNG_TYPE_PALETTE:
+ *pData++ = (unsigned char) PaletteFind(palette, clr);
+ break;
}
- else
+
+ if ( bUseAlpha )
{
- data[(x << 2) + 3] = 0;
+ unsigned char uchAlpha = 255;
+ if ( bHasAlpha )
+ uchAlpha = *pAlpha++;
+
+ if ( bHasMask )
+ {
+ if ( (clr.red == mask.red)
+ && (clr.green == mask.green)
+ && (clr.blue == mask.blue) )
+ 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__
#endif // wxUSE_STREAMS
+/*static*/ wxVersionInfo wxPNGHandler::GetLibraryVersionInfo()
+{
+ // The version string seems to always have a leading space and a trailing
+ // new line, get rid of them both.
+ wxString str = png_get_header_version(NULL) + 1;
+ str.Replace("\n", "");
+
+ return wxVersionInfo("libpng",
+ PNG_LIBPNG_VER_MAJOR,
+ PNG_LIBPNG_VER_MINOR,
+ PNG_LIBPNG_VER_RELEASE,
+ str);
+}
+
#endif // wxUSE_LIBPNG
projects / wxWidgets.git / blobdiff