字体矢量的转换
下面是一个从TTF转向Vector的控件源代码。注意:不要理它的UniCode:)
其中,CharCode是字符代码,对于双字节的文字,用以下代码生成；
function CharCode(value:string):UINT;
begin
if Length(value)=1 then
begin
CharCode:=Ord(Value[1]);
end
else if (Length(value)=2) and(Value[1] in LeadBytes) then
begin
CharCode:=(Ord(Value[1]) shl 8 )or Ord(Value[2]);
end
else
begin
Raise(Exception.Create(value+'不是合法的中西文字符!'));
Exit;
end;
{
UTTF2Vct.pas (was UTTFToVector.pas; changed for 8.3 compatibility )
TTF to Vector converter
Copyright (c) 1996-97 by Marco Cocco. All rights reseved.
Copyright (c) 1996-97 by D3K Artisan Of Ware. All rights reseved.
Please send comments to d3k@italymail.com
mcocco@hotmail.com
URL: http://free.websight.com/Cocco2/
Do you need additional features ? Feel free to ask for it!
******************************************************************************
* Permission to use, copy, modify, and distribute this software and its *
* documentation without fee for any non-commerical purpose is hereby granted,*
* provided that the above copyright notice appears on all copies and that *
* both that copyright notice and this permission notice appear in all *
* supporting documentation. *
* *
* NO REPRESENTATIONS ARE MADE ABOUT THE SUITABILITY OF THIS SOFTWARE FOR ANY *
* PURPOSE. IT IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY. *
* NEITHER MARCO COCCO OR D3K SHALL BE LIABLE FOR ANY DAMAGES SUFFERED BY *
* THE USE OF THIS SOFTWARE. *
******************************************************************************
* D3K - Artisan Of Ware - A Marco Cocco's Company *
* Casella Postale 99 - 09047 Selargius (CA) - ITALY *
******************************************************************************
History
------------------------------------------------------------------
17/Dec/1996 v1.00 Start of implementation
19/Dec/1996 v1.01 Added some sparse comments
20/Dec/1996 v1.02 Added support for Delphi 1.0/Win3.x
20/Dec/1996 v2.00 Converterd from pure class to component
20/Dec/1996 v2.01 Added support for UNICODE (Delphi 2.0 only)
03/Jan/1997 v2.02 Coordinate scaling causing runtime errors has been fixed.
Bug in memory allocation has been fixed (Delphi 1.0).
Now works even with R+, Q+
04/Jan/1997 v2.03 Added automatic conversion of glyphs to a GDI region
(useful for clipping & special effects)
14/Jan/1997 v2.04 Some minor changes
15/Jan/1997 v2.05 Some minor changes
To do:
- Test for new routines added in v2.03
- Glyph scaling to caller defined dimensions (!)
- Baseline coordinate retrieval (!)
- UNICODE tests (need WinNT to do this) (!)
- Increase performance and spline precision (?)
- Triangle subdivision for texture mapping (?)
- Char to char morphing (?)
- 3D Extrusion (?)
(!) = to do as soon as possible
(?) = may be
}
unit UTTF2Vct;
interface
uses
{$IFDEF WIN32}
Windows,
{$ELSE}
WinTypes, WinProcs,
{$ENDIF}
Classes, Graphics, SysUtils;
type
{ Font stroke: a Font Stroke is the "basic" element of a character glyph,
that is a glyph is a sequence of connected strokes (lines).
First point of first stroke connects to last point of last stroke.
All strokes with equal GlyphNumber value come from the same glyph.
Strokes of the same glyph are stored sequentially, i.e. stroke 0,
stroke 1, ... stoke n-1. }
PFontStroke = ^TFontStroke;
TFontStroke = record
GlyphNumber: integer;
Pt1, Pt2: TPoint; { Note: Strokes[i].Pt2=Strokes[i+1].Pt1
(also Strokes[i].Pt1=Strokes[i-1].Pt2)
when Strokes[i].GlyphNumber = Strokes[i+1].GlyphNumber }
end;
TEnumStrokesCallback = function( Idx: integer; const Stroke: TFontStroke ): boolean of object;
TStrokeCollection = class( TList )
private
protected
function GetNumGlyphs: integer;
function GetFontStroke( Idx: integer ): TFontStroke;
procedure FreeStrokes;
function GetBounds: TRect;
public
constructor Create; virtual;
destructor Destroy; override;
{ Returns the index of the first stroke for the glyph number GlyphNumber }
function StartOfGlyph( GlyphNumber: integer ): integer;
{ Returns the count of strokes for the glyph number GlyphNumber. }
function GlyphNumStrokes( GlyphNumber: integer ): integer;
{ Enumerates all strokes of all glyphs }
procedure EnumStrokes( Callback: TEnumStrokesCallback );
{ Returns the number of glyphs }
property NumGlyphs: integer read GetNumGlyphs;
{ Returns the stroke number Idx. Use StrartOfGlyph to determine
the index of the first stroke for a given glyph.
Use GlyphNumStrokes to determine the number of strokes a glyph is. }
property Stroke[Idx:integer]: TFontStroke read GetFontStroke;
{ Returns the smallest rectangle that completely bounds all glyphs }
property Bounds: TRect read GetBounds;
end;
TTTFToVectorConverter = class( TComponent )
private
FFont: TFont;
FSplinePrecision: integer;
FUNICODE: boolean;
protected
procedure SetFont( Value: TFont ); virtual;
procedure SetSplinePrecision( Value: integer );
public
constructor Create( Owner: TComponent ); override;
destructor Destroy; override;
function GetCharacterGlyphs( CharCode: integer ): TStrokeCollection;
function StrokesToRegion(Strokes:TStrokeCollection;SizeX, SizeY, OfsX, OfsY: integer ): HRGN;
function GetCharacterRegion( CharCode, SizeX, SizeY, OfsX, OfsY: integer ): HRGN;
published
property Font: TFont read FFont write SetFont;
property Precision: integer read FSplinePrecision write SetSplinePrecision default 5;
{$IFDEF WIN32}
{ Set to TRUE if you wish retrieve outlines for UNICODE fonts
NEVER TESTED!!! }
property UNICODE: boolean read FUNICODE write FUNICODE default false;
{$ENDIF}
end;
procedure Register;
implementation
{$IFNDEF WIN32}
type
DWORD = longint;
PTTPolygonHeader = ^TTTPolygonHeader;
TTTPolygonHeader = packed record
cb: DWORD;
dwType: DWORD;
pfxStart: TPointFX;
end;
const
GDI_ERROR = -1;
{$ENDIF}
{ *** TStrokeCollection ****************** }
constructor TStrokeCollection.Create;
begin
inherited Create;
end;
destructor TStrokeCollection.Destroy;
begin
FreeStrokes;
inherited Destroy;
end;
procedure TStrokeCollection.FreeStrokes;
var i: integer;
begin
for i := 0 to Count-1 do
begin
{$IFDEF WIN32}
FreeMem( Items[i] );
{$ELSE}
FreeMem( Items[i], sizeof(TFontStroke) );
{$ENDIF}
Items[i] := nil;
end;
Pack;
end;
function TStrokeCollection.GetNumGlyphs: integer;
begin
if Count = 0 then
Result := 0
else
Result := PFontStroke(Items[Count-1])^.GlyphNumber+1;
end;
function TStrokeCollection.StartOfGlyph( GlyphNumber: integer ): integer;
var ng, i: integer;
begin
ng := GetNumGlyphs;
if (GlyphNumber<0) or (GlyphNumber>=ng) then
Result := -1
else
begin
for i := 0 to Count-1 do
if PFontStroke(Items[i])^.GlyphNumber = GlyphNumber then
break;
Result := i;
end;
end;
function TStrokeCollection.GlyphNumStrokes( GlyphNumber: integer ): integer;
var sog, eog: integer;
begin
sog := StartOfGlyph( GlyphNumber );
if sog < 0 then
Result := -1
else
begin
eog := StartOfGlyph( GlyphNumber+1 );
if eog < 0 then
eog := Count;
Result := eog - sog;
end;
end;
function TStrokeCollection.GetFontStroke( Idx: integer ): TFontStroke;
begin
if (Idx>=0) and (Idx Result.Right then
Result.Right := fs^.Pt1.X;
if fs^.Pt2.X < Result.Left then
Result.Left := fs^.Pt2.X;
if fs^.Pt2.X > Result.Right then
Result.Right := fs^.Pt2.X;
if fs^.Pt1.Y < Result.Top then
Result.Top := fs^.Pt1.Y;
if fs^.Pt1.Y > Result.Bottom then
Result.Bottom := fs^.Pt1.Y;
if fs^.Pt2.Y < Result.Top then
Result.Top := fs^.Pt2.Y;
if fs^.Pt2.Y > Result.Bottom then
Result.Bottom := fs^.Pt2.Y;
end;
end;
{ *** TTTFToVectorConverter ************** }
constructor TTTFToVectorConverter.Create( Owner: TComponent );
begin
inherited Create( Owner );
FFont := TFont.Create;
FFont.Name := 'Arial';
FFont.Size := 28;
FSplinePrecision := 8;
FUNICODE := false;
end;
destructor TTTFToVectorConverter.Destroy;
begin
FFont.Free;
inherited Destroy;
end;
procedure TTTFToVectorConverter.SetFont( Value: TFont );
begin
FFont.Assign( Value );
end;
procedure TTTFToVectorConverter.SetSplinePrecision( Value: integer );
begin
if (Value<1) or (Value>100) then
exit;
FSplinePrecision := Value;
end;
type
TFXPArray = array[0..MaxInt div sizeof(TPOINTFX)-1] of TPOINTFX;
PFXPArray = ^TFXPArray;
function TTTFToVectorConverter.GetCharacterGlyphs( CharCode: integer ): TStrokeCollection;
const EMSIZE = 1024; SIZEX = 1024; SIZEY = 1024;
type TDPoint = record x,y: double end;
var res, bufSize : integer;
bufPtr, buf: PTTPolygonHeader;
pc: PTTPolyCurve;
dc, mdc: HDC;
ofont: HFONT;
gm: TGLYPHMETRICS;
m2: TMAT2;
ps, p1, p2 : TDPoint;
ofs, ofs2, pcSize: integer;
done: boolean;
i: integer;
pfxA, pfxB, pfXC: TDPoint;
lpAPFX: PFXPArray;
polyN: integer;
pcType: integer;
first: boolean;
function Fix2Double( AFix: TFixed ): double;
begin
Result := AFix.fract/65536.0 + AFix.value;
end;
function EqualPoints( var p1, p2: TDPoint ): boolean;
begin
Result := (p1.X = p2.X) and
(p1.Y = p2.Y);
end;
procedure NewStroke( GlyphNumber: integer; var Pt1, Pt2: TDPoint );
var ps: PFontStroke;
begin
ps := AllocMem( sizeof(TFontStroke) );
ps^.GlyphNumber := GlyphNumber;
ps^.Pt1.X := round(Pt1.X/EMSIZE*SIZEX);
ps^.Pt1.Y := round(Pt1.Y/EMSIZE*SIZEY);
ps^.Pt2.X := round(Pt2.X/EMSIZE*SIZEX);
ps^.Pt2.Y := round(Pt2.Y/EMSIZE*SIZEY);
Result.Add( ps );
end;
procedure DrawQSpline( APolyN: integer; var pa, pb, pc: TDPoint );
var di, i: double;
p1,p2: TDPoint;
begin
di := 1.0 / FSplinePrecision;
i := di;
p2 := pa;
while i<=1.0 do
begin
if i-di/2 > 1.0-di then
i := 1.0;
p1 := p2;
p2.X := (pa.X-2*pb.X+pc.X)*sqr(i) + (2*pb.X-2*pa.X)*i + pa.X;
p2.Y := (pa.Y-2*pb.Y+pc.Y)*sqr(i) + (2*pb.Y-2*pa.Y)*i + pa.Y;
if not EqualPoints( p1, p2 ) then
NewStroke( APolyN, p1, p2 );
i := i + di;
end;
pc := p2;
end;
begin
Result := nil;
if Font.Handle = 0 then
exit;
dc := GetDC( 0 );
mdc := CreateCompatibleDC( dc );
ReleaseDC( 0, dc );
FFont.Size := EMSIZE;
ofont := SelectObject( mdc, FFont.Handle );
m2.eM11.value := 1; m2.eM11.fract := 1; { Identity matrix }
m2.eM12.value := 0; m2.eM12.fract := 1; { |1,0| }
m2.eM21.value := 0; m2.eM21.fract := 1; { |0,1| }
m2.eM22.value := 1; m2.eM22.fract := 1;
{$IFDEF WIN32}
if not FUNICODE then
bufSize := GetGlyphOutline( mdc,
CharCode,
GGO_NATIVE,
gm,
0, nil,
m2 )
else
bufSize := GetGlyphOutlineW( mdc,
CharCode,
GGO_NATIVE,
gm,
0, nil,
m2 );
{$ELSE}
bufSize := GetGlyphOutline( mdc,
CharCode,
GGO_NATIVE,
gm,
0, nil,
m2 );
{$ENDIF}
if (bufSize = GDI_ERROR) or (bufSize=0) then
begin
SelectObject( mdc, ofont );
DeleteDC( mdc );
exit;
end;
bufPtr := AllocMem( bufSize );
buf := bufPtr;
{$IFDEF WIN32}
if not FUNICODE then
res := GetGlyphOutline( mdc,
CharCode,
GGO_NATIVE,
gm,
bufSize, pchar(buf),
m2 )
else
res := GetGlyphOutlineW( mdc,
CharCode,
GGO_NATIVE,
gm,
bufSize, pchar(buf),
m2 );
{$ELSE}
res := GetGlyphOutline( mdc,
CharCode,
GGO_NATIVE,
gm,
bufSize, pchar(buf),
m2 );
{$ENDIF}
SelectObject( mdc, ofont );
DeleteDC( mdc );
if (res = GDI_ERROR) or (buf^.dwType <> TT_POLYGON_TYPE) then
begin
{$IFDEF WIN32}
FreeMem( bufPtr );
{$ELSE}
FreeMem( bufPtr, bufSize );
{$ENDIF}
exit;
end;
Result := TStrokeCollection.Create;
done := false;
ofs := 0;
polyN := 0;
while not done do
begin
ps.X := Fix2Double( buf^.pfxStart.X );
ps.Y := Fix2Double( buf^.pfxStart.Y );
pcSize := buf^.cb - sizeof(TTTPOLYGONHEADER);
pchar(pc) := pchar(buf) + sizeof(TTTPOLYGONHEADER);
ofs2 := 0;
p2 := ps;
while not done and (ofs2 < pcSize) do
begin
pcType := pc^.wType;
case pcType of
TT_PRIM_LINE:
begin
lpAPFX := @pc^.apfx[0];
for i := 0 to pc^.cpfx-1 do
begin
p1 := p2;
p2.X := Fix2Double(lpAPFX^[i].X);
p2.Y := Fix2Double(lpAPFX^[i].Y);
if not EqualPoints( p1, p2 ) then
NewStroke( polyN, p1, p2 );
end;
end;
TT_PRIM_QSPLINE:
begin
lpAPFX := @pc^.apfx[0];
pfxA := p2;
for i := 0 to pc^.cpfx-2 do
begin
pfxB.X := Fix2Double(lpAPFX^[i].X);
pfxB.Y := Fix2Double(lpAPFX^[i].Y);
if i < pc^.cpfx-2 then
begin
pfxC.X := Fix2Double(lpAPFX^[i+1].X);
pfxC.Y := Fix2Double(lpAPFX^[i+1].Y);
pfxC.X := (pfxC.X + pfxB.X) / 2;
pfxC.Y := (pfxC.Y + pfxB.Y) / 2;
end
else
begin
pfxC.X := Fix2Double(lpAPFX^[i+1].X);
pfxC.Y := Fix2Double(lpAPFX^[i+1].Y);
end;
DrawQSpline( polyN, pfxA, pfxB, pfxC );
pfxA := pfxC;
end;
p2 := pfxC;
end;
end;
ofs2 := ofs2 + sizeof(TTTPOLYCURVE) + (pc^.cpfx-1)*sizeof(TPOINTFX);
pchar(pc) := pchar(pc) + sizeof(TTTPOLYCURVE) + (pc^.cpfx-1)*sizeof(TPOINTFX);
end;
if not done then
begin
p1 := p2;
p2 := ps;
if not EqualPoints( p1, p2 ) then
NewStroke( polyN, p1, p2 );
ofs := ofs + pcSize + sizeof(TTTPOLYGONHEADER);
done := ofs >= bufSize-sizeof(TTTPolygonHeader);
pchar(buf) := pchar(pc);
inc( polyN );
end;
end;
{$IFDEF WIN32}
FreeMem( bufPtr );
{$ELSE}
FreeMem( bufPtr, bufSize );
{$ENDIF}
end;
function TTTFToVectorConverter.GetCharacterRegion( CharCode, SizeX, SizeY, OfsX, OfsY: integer ): HRGN;
var strokes: TStrokeCollection;
cbounds: TRect;
i, j, k, sog: integer;
polys, pps: ^TPoint;
{$ifdef WIN32}
polyCounts, ppc: ^UINT;
{$else}
polyCounts, ppc: ^word;
{$endif}
stroke: TFontStroke;
sx, sy: double; { Scaling factors }
begin
{ ************************************** }
{ Convert to polilines }
{ ************************************** }
strokes := GetCharacterGlyphs( CharCode );
if strokes = nil then
begin
Result := 0;
exit;
end;
{ ************************************** }
{ Compose the GDI region }
{ ************************************** }
{ Get character bounds }
cbounds := strokes.Bounds;
{ Scaling factors }
sx := SizeX/(cbounds.Right-cbounds.Left+1);
sy := SizeY/(cbounds.Bottom-cbounds.Top+1);
{ Allocate memory for (all) the points }
polys := AllocMem( sizeof(TPoint) * strokes.Count );
{ Allocate memory for the "points per polygon" counters }
{$IFDEF WIN32}
polyCounts := AllocMem( sizeof(UINT) * strokes.NumGlyphs );
{$ELSE}
polyCounts := AllocMem( sizeof(word) * strokes.NumGlyphs );
{$ENDIF}
{ Copy glyphs' points to the allocated buffers }
pps := polys;
ppc := polyCounts;
for i := 0 to strokes.NumGlyphs-1 do
begin
ppc^ := strokes.GlyphNumStrokes( i );
sog := strokes.StartOfGlyph( i );
for j := 0 to ppc^-1 do
begin
{ Get a stroke }
stroke := strokes.Stroke[sog+j];
{ Store it }
pps^.x := OfsX + round( (stroke.Pt1.X-cbounds.Left) * sx );
pps^.y := OfsY + round( (cbounds.Bottom-stroke.Pt1.Y) * sy ); { Flip vertically! }
{ Next }
pps := pointer( pchar(pps) + sizeof(TPoint) );
end;
ppc := pointer( pchar(ppc) + sizeof(ppc^) );
end;
Result := CreatePolyPolygonRgn( polys^,
polyCounts^,
strokes.NumGlyphs,
WINDING );
{ Release buffers }
{$IFDEF WIN32}
FreeMem( polys );
FreeMem( polyCounts );
{$ELSE}
FreeMem( polys, sizeof(TPoint) * strokes.Count );
FreeMem( polyCounts, sizeof(word) * strokes.NumGlyphs );
{$ENDIF}
{ Release the strokes }
strokes.Free;
end;
function TTTFToVectorConverter.StrokesToRegion(Strokes:TStrokeCollection;SizeX, SizeY, OfsX, OfsY: integer ): HRGN;
var
cbounds: TRect;
i, j, k, sog: integer;
polys, pps: ^TPoint;
{$ifdef WIN32}
polyCounts, ppc: ^UINT;
{$else}
polyCounts, ppc: ^word;
{$endif}
stroke: TFontStroke;
sx, sy: double; { Scaling factors }
begin
{ ************************************** }
{ Convert to polilines }
{ ************************************** }
if strokes = nil then
begin
Result := 0;
exit;
end;
{ ************************************** }
{ Compose the GDI region }
{ ************************************** }
{ Get character bounds }
cbounds := strokes.Bounds;
{ Scaling factors }
sx := SizeX/(cbounds.Right-cbounds.Left+1);
sy := SizeY/(cbounds.Bottom-cbounds.Top+1);
{ Allocate memory for (all) the points }
polys := AllocMem( sizeof(TPoint) * strokes.Count );
{ Allocate memory for the "points per polygon" counters }
{$IFDEF WIN32}
polyCounts := AllocMem( sizeof(UINT) * strokes.NumGlyphs );
{$ELSE}
polyCounts := AllocMem( sizeof(word) * strokes.NumGlyphs );
{$ENDIF}
{ Copy glyphs' points to the allocated buffers }
pps := polys;
ppc := polyCounts;
for i := 0 to strokes.NumGlyphs-1 do
begin
ppc^ := strokes.GlyphNumStrokes( i );
sog := strokes.StartOfGlyph( i );
for j := 0 to ppc^-1 do
begin
{ Get a stroke }
stroke := strokes.Stroke[sog+j];
{ Store it }
pps^.x := OfsX + round( (stroke.Pt1.X-cbounds.Left) * sx );
pps^.y := OfsY + round( (cbounds.Bottom-stroke.Pt1.Y) * sy ); { Flip vertically! }
{ Next }
pps := pointer( pchar(pps) + sizeof(TPoint) );
end;
ppc := pointer( pchar(ppc) + sizeof(ppc^) );
end;
Result := CreatePolyPolygonRgn( polys^,
polyCounts^,
strokes.NumGlyphs,
WINDING );
{ Release buffers }
{$IFDEF WIN32}
FreeMem( polys );
FreeMem( polyCounts );
{$ELSE}
FreeMem( polys, sizeof(TPoint) * strokes.Count );
FreeMem( polyCounts, sizeof(word) * strokes.NumGlyphs );
{$ENDIF}
{ Release the strokes }
strokes.Free;
end;
procedure Register;
begin
RegisterComponents( 'D3K', [TTTFToVectorConverter]);
end;
end.