// declarations
// ============================================================================
-#ifdef __GNUG__
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "imagpng.h"
#endif
// 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);
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_error(png_structp WXUNUSED(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
+ wxLogFatalError( wxString::FromAscii(message) );
}
void
PNGLINKAGEMODE wx_png_warning(png_structp png_ptr, png_const_charp message)
{
- wxPNGInfoStruct *info = WX_PNG_INFO(png_ptr);
- if (info->verbose)
+ wxPNGInfoStruct *info = png_ptr ? WX_PNG_INFO(png_ptr) : NULL;
+ if ( !info || info->verbose )
wxLogWarning( wxString::FromAscii(message) );
}
// 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
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)
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)
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);
png_set_IHDR( png_ptr, info_ptr, image->GetWidth(), image->GetHeight(), 8,
PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
if (!data)
{
png_destroy_write_struct( &png_ptr, (png_infopp)NULL );
- return FALSE;
+ return false;
}
for (int y = 0; y < image->GetHeight(); y++)
data[(x << 2) + 0] = *ptr++;
data[(x << 2) + 1] = *ptr++;
data[(x << 2) + 2] = *ptr++;
- if (( !image->HasMask() ) || \
+ if ( image->HasAlpha() )
+ {
+ data[(x << 2) + 3] = image->GetAlpha(x, y);
+ }
+ else if (( !image->HasMask() ) || \
(data[(x << 2) + 0] != image->GetMaskRed()) || \
(data[(x << 2) + 1] != image->GetMaskGreen()) || \
(data[(x << 2) + 2] != image->GetMaskBlue()))
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