X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/b5131230626e20bde4bf9936eb7e5cebc8f629dc..64ea838d8f4d1853b7d850db93ee565e901d099a:/src/common/imagbmp.cpp diff --git a/src/common/imagbmp.cpp b/src/common/imagbmp.cpp index 41edf784b4..f3c7f8c040 100644 --- a/src/common/imagbmp.cpp +++ b/src/common/imagbmp.cpp @@ -39,6 +39,16 @@ // For memcpy #include +// ---------------------------------------------------------------------------- +// private functions +// ---------------------------------------------------------------------------- + +#if wxUSE_ICO_CUR + +static bool CanReadICOOrCUR(wxInputStream *stream, wxUint16 resourceType); + +#endif // wxUSE_ICO_CUR + //----------------------------------------------------------------------------- // wxBMPHandler //----------------------------------------------------------------------------- @@ -81,7 +91,7 @@ bool wxBMPHandler::SaveDib(wxImage *image, { wxCHECK_MSG( image, false, wxT("invalid pointer in wxBMPHandler::SaveFile") ); - if ( !image->Ok() ) + if ( !image->IsOk() ) { if ( verbose ) { @@ -136,8 +146,8 @@ bool wxBMPHandler::SaveDib(wxImage *image, } unsigned width = image->GetWidth(); - unsigned row_padding = (4 - int(width*bpp/8.0) % 4) % 4; // # bytes to pad to dword - unsigned row_width = int(width * bpp/8.0) + row_padding; // # of bytes per row + unsigned row_padding = (4 - ((width * bpp + 7) / 8) % 4) % 4; // # bytes to pad to dword + unsigned row_width = (width * bpp + 7) / 8 + row_padding; // # of bytes per row struct { @@ -341,7 +351,7 @@ bool wxBMPHandler::SaveDib(wxImage *image, // pointer to the image data, use quantized if available wxUint8 *data = (wxUint8*) image->GetData(); - if (q_image) if (q_image->Ok()) data = (wxUint8*) q_image->GetData(); + if (q_image) if (q_image->IsOk()) data = (wxUint8*) q_image->GetData(); wxUint8 *buffer = new wxUint8[row_width]; memset(buffer, 0, row_width); @@ -523,6 +533,14 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, wxON_BLOCK_EXIT1(&BMPPalette::Free, cmap); + bool isUpsideDown = true; + + if (height < 0) + { + isUpsideDown = false; + height = -height; + } + // destroy existing here instead of: image->Destroy(); image->Create(width, height); @@ -692,9 +710,10 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, // this case (see #10915) bool hasValidAlpha = false; - /* BMPs are stored upside down */ - for ( int line = (height - 1); line >= 0; line-- ) + for ( int row = 0; row < height; row++ ) { + int line = isUpsideDown ? height - 1 - row : row; + int linepos = 0; for ( int column = 0; column < width ; ) { @@ -724,21 +743,24 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, { if ( aByte == 0 ) { - if ( column > 0 ) - column = width; + // end of scanline marker + column = width; + row--; } else if ( aByte == 1 ) { + // end of RLE data marker, stop decoding column = width; - line = -1; + row = height; } else if ( aByte == 2 ) { + // delta marker, move in image aByte = stream.GetC(); column += aByte; linepos = column * bpp / 4; aByte = stream.GetC(); - line -= aByte; // upside down + row += aByte; // upside down } else { @@ -807,20 +829,24 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, { if ( aByte == 0 ) { - /* column = width; */ + // end of scanline marker + column = width; + row--; } else if ( aByte == 1 ) { + // end of RLE data marker, stop decoding column = width; - line = -1; + row = height; } else if ( aByte == 2 ) { + // delta marker, move in image aByte = stream.GetC(); column += aByte; linepos = column * bpp / 8; aByte = stream.GetC(); - line += aByte; + row -= aByte; } else { @@ -1239,7 +1265,7 @@ bool wxICOHandler::SaveFile(wxImage *image, // wxCountingOutputStream::IsOk() always returns true for now and this // "if" provokes VC++ warnings in optimized build #if 0 - if ( !cStream.Ok() ) + if ( !cStream.IsOk() ) { if ( verbose ) { @@ -1325,6 +1351,11 @@ bool wxICOHandler::SaveFile(wxImage *image, bool wxICOHandler::LoadFile(wxImage *image, wxInputStream& stream, bool verbose, int index) { + if ( stream.IsSeekable() && stream.SeekI(0) == wxInvalidOffset ) + { + return false; + } + return DoLoadFile(image, stream, verbose, index); } @@ -1413,10 +1444,16 @@ bool wxICOHandler::DoLoadFile(wxImage *image, wxInputStream& stream, int wxICOHandler::DoGetImageCount(wxInputStream& stream) { + // It's ok to modify the stream position in this function. + + if ( stream.IsSeekable() && stream.SeekI(0) == wxInvalidOffset ) + { + return 0; + } + ICONDIR IconDir; if (stream.Read(&IconDir, sizeof(IconDir)).LastRead() != sizeof(IconDir)) - // it's ok to modify the stream position here return 0; return (int)wxUINT16_SWAP_ON_BE(IconDir.idCount); @@ -1424,12 +1461,8 @@ int wxICOHandler::DoGetImageCount(wxInputStream& stream) bool wxICOHandler::DoCanRead(wxInputStream& stream) { - unsigned char hdr[4]; - if ( !stream.Read(hdr, WXSIZEOF(hdr)) ) // it's ok to modify the stream position here - return false; + return CanReadICOOrCUR(&stream, 1 /*for identifying an icon*/); - // hdr[2] is one for an icon and two for a cursor - return hdr[0] == '\0' && hdr[1] == '\0' && hdr[2] == '\1' && hdr[3] == '\0'; } #endif // wxUSE_STREAMS @@ -1445,12 +1478,7 @@ IMPLEMENT_DYNAMIC_CLASS(wxCURHandler, wxICOHandler) bool wxCURHandler::DoCanRead(wxInputStream& stream) { - unsigned char hdr[4]; - if ( !stream.Read(hdr, WXSIZEOF(hdr)) ) // it's ok to modify the stream position here - return false; - - // hdr[2] is one for an icon and two for a cursor - return hdr[0] == '\0' && hdr[1] == '\0' && hdr[2] == '\2' && hdr[3] == '\0'; + return CanReadICOOrCUR(&stream, 2 /*for identifying a cursor*/); } #endif // wxUSE_STREAMS @@ -1489,6 +1517,26 @@ int wxANIHandler::DoGetImageCount(wxInputStream& stream) return decoder.GetFrameCount(); } +static bool CanReadICOOrCUR(wxInputStream *stream, wxUint16 resourceType) +{ + // It's ok to modify the stream position in this function. + + if ( stream->IsSeekable() && stream->SeekI(0) == wxInvalidOffset ) + { + return false; + } + + ICONDIR iconDir; + if ( !stream->Read(&iconDir, sizeof(iconDir)) ) + { + return false; + } + + return !iconDir.idReserved // reserved, must be 0 + && wxUINT16_SWAP_ON_BE(iconDir.idType) == resourceType // either 1 or 2 + && iconDir.idCount; // must contain at least one image +} + #endif // wxUSE_STREAMS #endif // wxUSE_ICO_CUR