#ifndef WX_PRECOMP
#include "wx/dc.h"
#include "wx/intl.h"
+ #include "wx/math.h"
#include "wx/dcscreen.h"
#include "wx/log.h"
#include "wx/gdicmn.h"
#include "wx/tokenzr.h"
-// ============================================================================
-// implementation
-// ============================================================================
+// debugger helper: this function can be called from a debugger to show what
+// the date really is
+extern const char *wxDumpFont(const wxFont *font)
+{
+ static char buf[256];
-// ----------------------------------------------------------------------------
-// helper functions
-// ----------------------------------------------------------------------------
+ const wxFontWeight weight = font->GetWeight();
-static inline int flags2Style(int flags)
-{
- return flags & wxFONTFLAG_ITALIC
- ? wxFONTSTYLE_ITALIC
- : flags & wxFONTFLAG_SLANT
- ? wxFONTSTYLE_SLANT
- : wxFONTSTYLE_NORMAL;
+ wxString s;
+ s.Printf(wxS("%s-%s-%s-%d-%d"),
+ font->GetFaceName(),
+ weight == wxFONTWEIGHT_NORMAL
+ ? wxT("normal")
+ : weight == wxFONTWEIGHT_BOLD
+ ? wxT("bold")
+ : wxT("light"),
+ font->GetStyle() == wxFONTSTYLE_NORMAL
+ ? wxT("regular")
+ : wxT("italic"),
+ font->GetPointSize(),
+ font->GetEncoding());
+
+ wxStrlcpy(buf, s.mb_str(), WXSIZEOF(buf));
+ return buf;
}
-static inline int flags2Weight(int flags)
-{
- return flags & wxFONTFLAG_LIGHT
- ? wxFONTWEIGHT_LIGHT
- : flags & wxFONTFLAG_BOLD
- ? wxFONTWEIGHT_BOLD
- : wxFONTWEIGHT_NORMAL;
-}
+// ----------------------------------------------------------------------------
+// XTI
+// ----------------------------------------------------------------------------
-static inline bool flags2Underlined(int flags)
-{
- return (flags & wxFONTFLAG_UNDERLINED) != 0;
-}
+wxBEGIN_ENUM( wxFontFamily )
+wxENUM_MEMBER( wxFONTFAMILY_DEFAULT )
+wxENUM_MEMBER( wxFONTFAMILY_DECORATIVE )
+wxENUM_MEMBER( wxFONTFAMILY_ROMAN )
+wxENUM_MEMBER( wxFONTFAMILY_SCRIPT )
+wxENUM_MEMBER( wxFONTFAMILY_SWISS )
+wxENUM_MEMBER( wxFONTFAMILY_MODERN )
+wxENUM_MEMBER( wxFONTFAMILY_TELETYPE )
+wxEND_ENUM( wxFontFamily )
+
+wxBEGIN_ENUM( wxFontStyle )
+wxENUM_MEMBER( wxFONTSTYLE_NORMAL )
+wxENUM_MEMBER( wxFONTSTYLE_ITALIC )
+wxENUM_MEMBER( wxFONTSTYLE_SLANT )
+wxEND_ENUM( wxFontStyle )
+
+wxBEGIN_ENUM( wxFontWeight )
+wxENUM_MEMBER( wxFONTWEIGHT_NORMAL )
+wxENUM_MEMBER( wxFONTWEIGHT_LIGHT )
+wxENUM_MEMBER( wxFONTWEIGHT_BOLD )
+wxEND_ENUM( wxFontWeight )
+
+wxIMPLEMENT_DYNAMIC_CLASS_WITH_COPY_XTI(wxFont, wxGDIObject, "wx/font.h")
+
+//WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImpl<wxFont>)
+
+wxBEGIN_PROPERTIES_TABLE(wxFont)
+wxPROPERTY( Size,int, SetPointSize, GetPointSize, 12, 0 /*flags*/, \
+ wxT("Helpstring"), wxT("group"))
+wxPROPERTY( Family, wxFontFamily , SetFamily, GetFamily, (wxFontFamily)wxDEFAULT, \
+ 0 /*flags*/, wxT("Helpstring"), wxT("group")) // wxFontFamily
+wxPROPERTY( Style, wxFontStyle, SetStyle, GetStyle, (wxFontStyle)wxNORMAL, 0 /*flags*/, \
+ wxT("Helpstring"), wxT("group")) // wxFontStyle
+wxPROPERTY( Weight, wxFontWeight, SetWeight, GetWeight, (wxFontWeight)wxNORMAL, 0 /*flags*/, \
+ wxT("Helpstring"), wxT("group")) // wxFontWeight
+wxPROPERTY( Underlined, bool, SetUnderlined, GetUnderlined, false, 0 /*flags*/, \
+ wxT("Helpstring"), wxT("group"))
+wxPROPERTY( Strikethrough, bool, SetStrikethrough, GetStrikethrough, false, 0, \
+ wxT("Helpstring"), wxT("group"))
+wxPROPERTY( Face, wxString, SetFaceName, GetFaceName, wxEMPTY_PARAMETER_VALUE, \
+ 0 /*flags*/, wxT("Helpstring"), wxT("group"))
+wxPROPERTY( Encoding, wxFontEncoding, SetEncoding, GetEncoding, \
+ wxFONTENCODING_DEFAULT, 0 /*flags*/, wxT("Helpstring"), wxT("group"))
+wxEND_PROPERTIES_TABLE()
+
+wxCONSTRUCTOR_6( wxFont, int, Size, wxFontFamily, Family, wxFontStyle, Style, wxFontWeight, Weight, \
+ bool, Underlined, wxString, Face )
+
+wxEMPTY_HANDLERS_TABLE(wxFont)
+
+// ============================================================================
+// implementation
+// ============================================================================
// ----------------------------------------------------------------------------
// wxFontBase
// GetDefaultEncoding() should return something != wxFONTENCODING_DEFAULT
// and, besides, using this value here doesn't make any sense
wxCHECK_RET( encoding != wxFONTENCODING_DEFAULT,
- _T("can't set default encoding to wxFONTENCODING_DEFAULT") );
+ wxT("can't set default encoding to wxFONTENCODING_DEFAULT") );
ms_encodingDefault = encoding;
}
const wxString& face,
wxFontEncoding encoding)
{
- return New(pointSize, family, flags2Style(flags), flags2Weight(flags),
- flags2Underlined(flags), face, encoding);
+ return New(pointSize, family,
+ GetStyleFromFlags(flags),
+ GetWeightFromFlags(flags),
+ GetUnderlinedFromFlags(flags),
+ face, encoding);
}
/* static */
const wxString& face,
wxFontEncoding encoding)
{
- return New(pixelSize, family, flags2Style(flags), flags2Weight(flags),
- flags2Underlined(flags), face, encoding);
+ return New(pixelSize, family,
+ GetStyleFromFlags(flags),
+ GetWeightFromFlags(flags),
+ GetUnderlinedFromFlags(flags),
+ face, encoding);
}
/* static */
// NOTE: this algorithm for adjusting the font size is used by all
// implementations of wxFont except under wxMSW and wxGTK where
// native support to font creation using pixel-size is provided.
-
+
int largestGood = 0;
int smallestBad = 0;
SetStyle(info.style);
SetWeight(info.weight);
SetUnderlined(info.underlined);
+ SetStrikethrough(info.strikethrough);
SetFaceName(info.faceName);
SetEncoding(info.encoding);
#else
wxString wxFontBase::GetNativeFontInfoDesc() const
{
+ wxCHECK_MSG( IsOk(), wxEmptyString, wxT("invalid font") );
+
wxString fontDesc;
const wxNativeFontInfo *fontInfo = GetNativeFontInfo();
if ( fontInfo )
wxString wxFontBase::GetNativeFontInfoUserDesc() const
{
+ wxCHECK_MSG( IsOk(), wxEmptyString, wxT("invalid font") );
+
wxString fontDesc;
const wxNativeFontInfo *fontInfo = GetNativeFontInfo();
if ( fontInfo )
// have different ref datas but still describe the same font
return IsSameAs(font) ||
(
- Ok() == font.Ok() &&
+ IsOk() == font.IsOk() &&
GetPointSize() == font.GetPointSize() &&
// in wxGTK1 GetPixelSize() calls GetInternalFont() which uses
// operator==() resulting in infinite recursion so we can't use it
GetStyle() == font.GetStyle() &&
GetWeight() == font.GetWeight() &&
GetUnderlined() == font.GetUnderlined() &&
+ GetStrikethrough() == font.GetStrikethrough() &&
GetFaceName().IsSameAs(font.GetFaceName(), false) &&
GetEncoding() == font.GetEncoding()
);
}
+wxFontFamily wxFontBase::GetFamily() const
+{
+ wxCHECK_MSG( IsOk(), wxFONTFAMILY_UNKNOWN, wxS("invalid font") );
+
+ // Don't return wxFONTFAMILY_UNKNOWN from here because it prevents the code
+ // like wxFont(size, wxNORMAL_FONT->GetFamily(), ...) from working (see
+ // #12330). This is really just a hack but it allows to keep compatibility
+ // and doesn't really have any bad drawbacks so do this until someone comes
+ // up with a better idea.
+ const wxFontFamily family = DoGetFamily();
+
+ return family == wxFONTFAMILY_UNKNOWN ? wxFONTFAMILY_DEFAULT : family;
+}
+
wxString wxFontBase::GetFamilyString() const
{
- wxCHECK_MSG( Ok(), wxT("wxDEFAULT"), wxT("invalid font") );
+ wxCHECK_MSG( IsOk(), "wxFONTFAMILY_DEFAULT", "invalid font" );
switch ( GetFamily() )
{
- case wxDECORATIVE: return wxT("wxDECORATIVE");
- case wxROMAN: return wxT("wxROMAN");
- case wxSCRIPT: return wxT("wxSCRIPT");
- case wxSWISS: return wxT("wxSWISS");
- case wxMODERN: return wxT("wxMODERN");
- case wxTELETYPE: return wxT("wxTELETYPE");
- default: return wxT("wxDEFAULT");
+ case wxFONTFAMILY_DECORATIVE: return "wxFONTFAMILY_DECORATIVE";
+ case wxFONTFAMILY_ROMAN: return "wxFONTFAMILY_ROMAN";
+ case wxFONTFAMILY_SCRIPT: return "wxFONTFAMILY_SCRIPT";
+ case wxFONTFAMILY_SWISS: return "wxFONTFAMILY_SWISS";
+ case wxFONTFAMILY_MODERN: return "wxFONTFAMILY_MODERN";
+ case wxFONTFAMILY_TELETYPE: return "wxFONTFAMILY_TELETYPE";
+ case wxFONTFAMILY_UNKNOWN: return "wxFONTFAMILY_UNKNOWN";
+ default: return "wxFONTFAMILY_DEFAULT";
}
}
wxString wxFontBase::GetStyleString() const
{
- wxCHECK_MSG( Ok(), wxT("wxDEFAULT"), wxT("invalid font") );
+ wxCHECK_MSG( IsOk(), "wxFONTSTYLE_DEFAULT", "invalid font" );
switch ( GetStyle() )
{
- case wxNORMAL: return wxT("wxNORMAL");
- case wxSLANT: return wxT("wxSLANT");
- case wxITALIC: return wxT("wxITALIC");
- default: return wxT("wxDEFAULT");
+ case wxFONTSTYLE_NORMAL: return "wxFONTSTYLE_NORMAL";
+ case wxFONTSTYLE_SLANT: return "wxFONTSTYLE_SLANT";
+ case wxFONTSTYLE_ITALIC: return "wxFONTSTYLE_ITALIC";
+ default: return "wxFONTSTYLE_DEFAULT";
}
}
wxString wxFontBase::GetWeightString() const
{
- wxCHECK_MSG( Ok(), wxT("wxDEFAULT"), wxT("invalid font") );
+ wxCHECK_MSG( IsOk(), "wxFONTWEIGHT_DEFAULT", "invalid font" );
switch ( GetWeight() )
{
- case wxNORMAL: return wxT("wxNORMAL");
- case wxBOLD: return wxT("wxBOLD");
- case wxLIGHT: return wxT("wxLIGHT");
- default: return wxT("wxDEFAULT");
+ case wxFONTWEIGHT_NORMAL: return "wxFONTWEIGHT_NORMAL";
+ case wxFONTWEIGHT_BOLD: return "wxFONTWEIGHT_BOLD";
+ case wxFONTWEIGHT_LIGHT: return "wxFONTWEIGHT_LIGHT";
+ default: return "wxFONTWEIGHT_DEFAULT";
}
}
#if wxUSE_FONTENUM
if (!wxFontEnumerator::IsValidFacename(facename))
{
- UnRef(); // make Ok() return false
+ UnRef(); // make IsOk() return false
return false;
}
#else // !wxUSE_FONTENUM
return true;
}
+void wxFontBase::SetSymbolicSize(wxFontSymbolicSize size)
+{
+ SetSymbolicSizeRelativeTo(size, wxNORMAL_FONT->GetPointSize());
+}
+
+/* static */
+int wxFontBase::AdjustToSymbolicSize(wxFontSymbolicSize size, int base)
+{
+ // Using a fixed factor (1.2, from CSS2) is a bad idea as explained at
+ // http://www.w3.org/TR/CSS21/fonts.html#font-size-props so use the values
+ // from http://style.cleverchimp.com/font_size_intervals/altintervals.html
+ // instead.
+ static const float factors[] = { 0.60f, 0.75f, 0.89f, 1.f, 1.2f, 1.5f, 2.f };
+
+ wxCOMPILE_TIME_ASSERT
+ (
+ WXSIZEOF(factors) == wxFONTSIZE_XX_LARGE - wxFONTSIZE_XX_SMALL + 1,
+ WrongFontSizeFactorsSize
+ );
+
+ return wxRound(factors[size - wxFONTSIZE_XX_SMALL]*base);
+}
+
+wxFont& wxFont::MakeBold()
+{
+ SetWeight(wxFONTWEIGHT_BOLD);
+ return *this;
+}
+
+wxFont wxFont::Bold() const
+{
+ wxFont font(*this);
+ font.MakeBold();
+ return font;
+}
+
+wxFont& wxFont::MakeItalic()
+{
+ SetStyle(wxFONTSTYLE_ITALIC);
+ return *this;
+}
+
+wxFont wxFont::Italic() const
+{
+ wxFont font(*this);
+ font.MakeItalic();
+ return font;
+}
+
+wxFont& wxFont::MakeUnderlined()
+{
+ SetUnderlined(true);
+ return *this;
+}
+
+wxFont wxFont::Underlined() const
+{
+ wxFont font(*this);
+ font.MakeUnderlined();
+ return font;
+}
+
+wxFont wxFont::Strikethrough() const
+{
+ wxFont font(*this);
+ font.MakeStrikethrough();
+ return font;
+}
+
+wxFont& wxFont::MakeStrikethrough()
+{
+ SetStrikethrough(true);
+ return *this;
+}
+
+wxFont& wxFont::Scale(float x)
+{
+ SetPointSize(int(x*GetPointSize() + 0.5));
+ return *this;
+}
+
+wxFont wxFont::Scaled(float x) const
+{
+ wxFont font(*this);
+ font.Scale(x);
+ return font;
+}
// ----------------------------------------------------------------------------
// wxNativeFontInfo
// These are the generic forms of FromString()/ToString.
//
-// convert to/from the string representation: format is
-// version;pointsize;family;style;weight;underlined;facename;encoding
+// convert to/from the string representation: the general format is
+// "version;the rest..." with currently defined versions being:
+//
+// 0;pointsize;family;style;weight;underlined;facename;encoding
+// 1;pointsize;family;style;weight;underlined;strikethrough;facename;encoding
bool wxNativeFontInfo::FromString(const wxString& s)
{
long l;
+ unsigned long version;
- wxStringTokenizer tokenizer(s, _T(";"));
+ wxStringTokenizer tokenizer(s, wxT(";"));
wxString token = tokenizer.GetNextToken();
- //
- // Ignore the version for now
- //
+ if ( !token.ToULong(&version) || version > 1 )
+ return false;
token = tokenizer.GetNextToken();
if ( !token.ToLong(&l) )
return false;
underlined = l != 0;
+ if ( version == 1 )
+ {
+ token = tokenizer.GetNextToken();
+ if ( !token.ToLong(&l) )
+ return false;
+ strikethrough = l != 0;
+ }
+
faceName = tokenizer.GetNextToken();
#ifndef __WXMAC__
{
wxString s;
- s.Printf(_T("%d;%d;%d;%d;%d;%d;%s;%d"),
- 0, // version
+ s.Printf(wxT("%d;%d;%d;%d;%d;%d;%d;%s;%d"),
+ 1, // version
pointSize,
family,
(int)style,
(int)weight,
underlined,
+ strikethrough,
faceName.GetData(),
(int)encoding);
style = wxFONTSTYLE_NORMAL;
weight = wxFONTWEIGHT_NORMAL;
underlined = false;
+ strikethrough = false;
faceName.clear();
encoding = wxFONTENCODING_DEFAULT;
}
return underlined;
}
+bool wxNativeFontInfo::GetStrikethrough() const
+{
+ return strikethrough;
+}
+
wxString wxNativeFontInfo::GetFaceName() const
{
return faceName;
underlined = underlined_;
}
+void wxNativeFontInfo::SetStrikethrough(bool strikethrough_)
+{
+ strikethrough = strikethrough_;
+}
+
bool wxNativeFontInfo::SetFaceName(const wxString& facename_)
{
faceName = facename_;
// format there anyhow (but there is a well-defined standard for X11 fonts used
// by wxGTK and wxMotif)
-#if defined(wxNO_NATIVE_FONTINFO) || defined(__WXMSW__) || defined (__WXPM__)
+#if defined(wxNO_NATIVE_FONTINFO) || defined(__WXMSW__) || defined (__WXPM__) || defined(__WXOSX__)
wxString wxNativeFontInfo::ToUserString() const
{
desc << _("underlined");
}
+ if ( GetStrikethrough() )
+ {
+ desc << _("strikethrough");
+ }
+
switch ( GetWeight() )
{
default:
- wxFAIL_MSG( _T("unknown font weight") );
+ wxFAIL_MSG( wxT("unknown font weight") );
// fall through
case wxFONTWEIGHT_NORMAL:
switch ( GetStyle() )
{
default:
- wxFAIL_MSG( _T("unknown font style") );
+ wxFAIL_MSG( wxT("unknown font style") );
// fall through
case wxFONTSTYLE_NORMAL:
wxString face = GetFaceName();
if ( !face.empty() )
{
- desc << _T(' ') << face;
+ if (face.Contains(' ') || face.Contains(';') || face.Contains(','))
+ {
+ face.Replace("'", "");
+ // eventually remove quote characters: most systems do not
+ // allow them in a facename anyway so this usually does nothing
+
+ // make it possible for FromUserString() function to understand
+ // that the different words which compose this facename are
+ // not different adjectives or other data but rather all parts
+ // of the facename
+ desc << wxT(" '") << face << _("'");
+ }
+ else
+ desc << wxT(' ') << face;
+ }
+ else // no face name specified
+ {
+ // use the family
+ wxString familyStr;
+ switch ( GetFamily() )
+ {
+ case wxFONTFAMILY_DECORATIVE:
+ familyStr = "decorative";
+ break;
+
+ case wxFONTFAMILY_ROMAN:
+ familyStr = "roman";
+ break;
+
+ case wxFONTFAMILY_SCRIPT:
+ familyStr = "script";
+ break;
+
+ case wxFONTFAMILY_SWISS:
+ familyStr = "swiss";
+ break;
+
+ case wxFONTFAMILY_MODERN:
+ familyStr = "modern";
+ break;
+
+ case wxFONTFAMILY_TELETYPE:
+ familyStr = "teletype";
+ break;
+
+ case wxFONTFAMILY_DEFAULT:
+ case wxFONTFAMILY_UNKNOWN:
+ break;
+
+ default:
+ wxFAIL_MSG( "unknown font family" );
+ }
+
+ if ( !familyStr.empty() )
+ desc << " '" << familyStr << " family'";
}
int size = GetPointSize();
if ( size != wxNORMAL_FONT->GetPointSize() )
{
- desc << _T(' ') << size;
+ desc << wxT(' ') << size;
}
#if wxUSE_FONTMAP
wxFontEncoding enc = GetEncoding();
if ( enc != wxFONTENCODING_DEFAULT && enc != wxFONTENCODING_SYSTEM )
{
- desc << _T(' ') << wxFontMapper::GetEncodingName(enc);
+ desc << wxT(' ') << wxFontMapper::GetEncodingName(enc);
}
#endif // wxUSE_FONTMAP
// reset to the default state
Init();
+ // ToUserString() will quote the facename if it contains spaces, commas
+ // or semicolons: we must be able to understand that quoted text is
+ // a single token:
+ wxString toparse(s);
+
// parse a more or less free form string
- //
- // TODO: we should handle at least the quoted facenames
- wxStringTokenizer tokenizer(s, _T(";, "), wxTOKEN_STRTOK);
+ wxStringTokenizer tokenizer(toparse, wxT(";, "), wxTOKEN_STRTOK);
wxString face;
unsigned long size;
#if wxUSE_FONTMAP
bool encodingfound = false;
#endif
+ bool insideQuotes = false;
while ( tokenizer.HasMoreTokens() )
{
// normalize it
token.Trim(true).Trim(false).MakeLower();
+ if (insideQuotes)
+ {
+ if (token.StartsWith("'") ||
+ token.EndsWith("'"))
+ {
+ insideQuotes = false;
+
+ // add this last token to the facename:
+ face += " " + token;
+
+ // normalize facename:
+ face = face.Trim(true).Trim(false);
+ face.Replace("'", "");
+
+ continue;
+ }
+ }
+ else
+ {
+ if (token.StartsWith("'"))
+ insideQuotes = true;
+ }
// look for the known tokens
- if ( token == _T("underlined") || token == _("underlined") )
+ if ( insideQuotes )
+ {
+ // only the facename may be quoted:
+ face += " " + token;
+ continue;
+ }
+ if ( token == wxT("underlined") || token == _("underlined") )
{
SetUnderlined(true);
}
- else if ( token == _T("light") || token == _("light") )
+ else if ( token == wxT("strikethrough") || token == _("strikethrough") )
+ {
+ SetStrikethrough(true);
+ }
+ else if ( token == wxT("light") || token == _("light") )
{
SetWeight(wxFONTWEIGHT_LIGHT);
weightfound = true;
}
- else if ( token == _T("bold") || token == _("bold") )
+ else if ( token == wxT("bold") || token == _("bold") )
{
SetWeight(wxFONTWEIGHT_BOLD);
weightfound = true;
}
- else if ( token == _T("italic") || token == _("italic") )
+ else if ( token == wxT("italic") || token == _("italic") )
{
SetStyle(wxFONTSTYLE_ITALIC);
}
// assume it is the face name
if ( !face.empty() )
{
- face += _T(' ');
+ face += wxT(' ');
}
face += token;
// bar")
if ( !face.empty() )
{
+ wxString familyStr;
+ if ( face.EndsWith(" family", &familyStr) )
+ {
+ // it's not a facename but rather a font family
+ wxFontFamily family;
+ if ( familyStr == "decorative" )
+ family = wxFONTFAMILY_DECORATIVE;
+ else if ( familyStr == "roman" )
+ family = wxFONTFAMILY_ROMAN;
+ else if ( familyStr == "script" )
+ family = wxFONTFAMILY_SCRIPT;
+ else if ( familyStr == "swiss" )
+ family = wxFONTFAMILY_SWISS;
+ else if ( familyStr == "modern" )
+ family = wxFONTFAMILY_MODERN;
+ else if ( familyStr == "teletype" )
+ family = wxFONTFAMILY_TELETYPE;
+ else
+ return false;
+
+ SetFamily(family);
+ }
// NB: the check on the facename is implemented in wxFontBase::SetFaceName
- // and not in wxNativeFontInfo::SetFaceName thus we need to explicitely
+ // and not in wxNativeFontInfo::SetFaceName thus we need to explicitly
// call here wxFontEnumerator::IsValidFacename
- if (
+ else if (
#if wxUSE_FONTENUM
!wxFontEnumerator::IsValidFacename(face) ||
#endif // wxUSE_FONTENUM
if ( !face.empty() )
{
// NB: the check on the facename is implemented in wxFontBase::SetFaceName
- // and not in wxNativeFontInfo::SetFaceName thus we need to explicitely
+ // and not in wxNativeFontInfo::SetFaceName thus we need to explicitly
// call here wxFontEnumerator::IsValidFacename
if (
#if wxUSE_FONTENUM
bool wxFromString(const wxString& str, wxFontBase *font)
{
- wxCHECK_MSG( font, false, _T("NULL output parameter") );
+ wxCHECK_MSG( font, false, wxT("NULL output parameter") );
if ( str.empty() )
{
projects / wxWidgets.git / blobdiff