1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
|
Unit CanvasFontManager;
{$mode objfpc}{$H+}
Interface
Uses
Classes
,fpg_base
,fpg_main
,fpg_widget
;
Const
// This defines the fraction of a pixel that
// font character widths will be given in
FontWidthPrecisionFactor = 1; // 256 seems to be specific to OS/2 API
DefaultTopicFont = 'Sans';
DefaultTopicFontSize = '10';
DefaultTopicFixedFont = 'Courier New';
DefaultTopicFixedFontSize = '10';
Type
{Standard Font types}
TFontType=(ftBitmap,ftOutline);
{Standard Font Attributes}
TFontAttributes=Set Of(faItalic,faUnderScore,faOutline,faStrikeOut,faBold);
{Standard Font pitches}
TFontPitch=(fpFixed,fpProportional);
{Standard Font character Set}
TFontCharSet=(fcsSBCS,fcsDBCS,fcsMBCS); {Single,Double,mixed Byte}
// a user-oriented specification of a font; not an actual structure in the INF file
TFontSpec = record
FaceName: string[ 64 ];
PointSize: integer; // if 0 then use x/y size
XSize: integer;
YSize: integer;
Attributes: TFontAttributes; // set of faBold, faItalic etc
end;
// NOTE: Char widths are in 1/FontWidthPrecisionFactor units
TCharWidthArray = array[ #0..#255 ] of longint;
TPCharWidthArray = ^TCharWidthArray;
// Used internally for storing full info on font
TLogicalFont = class(TObject)
public
FaceName: string; // user-selected name
UseFaceName: string; // after substitutions.
// Selected bits of FONTMETRICS
fsSelection: word; //USHORT;
FontType: TFontType;
FixedWidth: boolean;
PointSize: integer;
ID: integer;
Attributes: TFontAttributes;
// this can be nil if not already fetched
pCharWidthArray: TPCharWidthArray;
lMaxbaselineExt: longint; //LONG;
lAveCharWidth: longint; //LONG;
lMaxCharInc: longint; //LONG;
lMaxDescender: longint; //LONG;
public
constructor Create;
destructor Destroy; override;
end;
TFontFace = class(TObject)
public
Name: string;
FixedWidth: boolean;
FontType: TFontType;
Sizes: TList; // relevant for bitmap fonts only - contains TLogicalFont objects
constructor Create;
destructor Destroy; override;
end;
TCanvasFontManager = class(TObject)
private
FWidget: TfpgWidget;
protected
FCanvas: TfpgCanvas;
FLogicalFonts: TList;
FCurrentFontSpec: TFontSpec;
FDefaultFontSpec: TFontSpec;
FCurrentFont: TLogicalFont;
FAllowBitmapFonts: boolean;
function CreateFont( const FontSpec: TFontSpec ): TLogicalFont;
function GetFont( const FontSpec: TFontSpec ): TLogicalFont;
procedure RegisterFont( Font: TLogicalFont );
procedure SelectFont( Font: TLogicalFont; Scale: longint );
// Retrieve character widths for current font
procedure LoadMetrics;
// load metrics if needed
procedure EnsureMetricsLoaded;
public
constructor Create(Canvas: TfpgCanvas; AllowBitmapFonts: boolean; AWidget: TfpgWidget); reintroduce;
destructor Destroy; override;
// Set the font for the associated canvas.
procedure SetFont( const FontSpec: TFontSpec );
// Retrieve the width of the given char, in the current font
function CharWidth( const C: Char ): longint;
function AverageCharWidth: longint;
function MaximumCharWidth: longint;
function IsFixed: boolean;
function CharHeight: longint;
function CharDescender: longint;
procedure DrawString(var Point: TPoint; const Length: longint; const S: PChar);
property Canvas: TfpgCanvas read FCanvas;
property Widget: TfpgWidget read FWidget;
property DefaultFontSpec: TFontSpec read FDefaultFontSpec write FDefaultFontSpec;
end;
// Convert a Sibyl font to a FontSpec (Color is left the same)
procedure FPGuiFontToFontSpec( Font: TfpgFont; Var FontSpec: TFontSpec );
// Thoughts on how it works....
// SelectFont looks for an existing logical font that
// matches the request. If found selects that logical font
// onto the canvas.
// If not found it creates a logical font and selects that onto
// the canvas.
// For bitmap fonts the logical font definition includes pointsize
// For outline fonts the defn is only face+attr; in this case
// selectfont also ses the 'CharBox' according to the point size.
implementation
uses
SysUtils
,ACLStringUtility
,nvUtilities
,fpg_stringutils
;
var
FontFaces: TList = nil; // of TFontface
DefaultOutlineFixedFace: TFontFace;
DefaultOutlineProportionalFace: TFontFace;
// TFontFace
//------------------------------------------------------------------------
constructor TFontface.Create;
begin
Sizes := TList.Create;
FontType := ftOutline; // in fpGUI we treat all fonts as scalable (preference)
end;
destructor TFontface.Destroy;
begin
Sizes.Free;
end;
// TLogicalFont
//------------------------------------------------------------------------
constructor TLogicalFont.Create;
begin
FontType := ftOutline;
PointSize := 10;
Attributes := [];
FixedWidth := False;
UseFaceName := '';
FaceName := '';
end;
// frees allocated memory, if any.
// Note - does not delete the Gpi Logical Font
destructor TLogicalFont.Destroy;
begin
if pCharWidthArray <> nil then
FreeMem( pCharWidthArray,
sizeof( TCharWidthArray ) );
inherited Destroy;
end;
// Convert a fpGUI Toolkit font to a FontSpec
//------------------------------------------------------------------------
procedure FPGuiFontToFontSpec( Font: TfpgFont; Var FontSpec: TFontSpec );
var
s: string;
facename: string;
cp: integer;
c: char;
token: string;
prop, propval: string;
desc: string;
function NextC: char;
begin
Inc(cp);
if cp > length(desc) then
c := #0
else
c := desc[cp];
Result := c;
end;
procedure NextToken;
begin
token := '';
while (c <> #0) and (c in [' ', 'a'..'z', 'A'..'Z', '_', '0'..'9']) do
begin
token := token + c;
NextC;
end;
end;
begin
cp := 0;
desc := Font.FontDesc;
// find fontface
NextC;
NextToken;
FontSpec.FaceName := token;
FontSpec.Attributes := [];
FontSpec.XSize := Font.TextWidth('v');
FontSpec.YSize := Font.Height;
// find font size
if c = '-' then
begin
NextC;
NextToken;
FontSpec.PointSize := StrToIntDef(token, 10);
end;
// find font attributes
while c = ':' do
begin
NextC;
NextToken;
prop := UpperCase(token);
propval := '';
if c = '=' then
begin
NextC;
NextToken;
propval := UpperCase(token);
end;
// convert fontdesc attributes to fontspec attributes
if prop = 'BOLD' then
include(FontSpec.Attributes, faBold)
else if prop = 'ITALIC' then
include(FontSpec.Attributes, faItalic)
else if prop = 'UNDERLINE' then
include(FontSpec.Attributes, faUnderScore)
end;
end;
// Find a font face with the given name
//------------------------------------------------------------------------
function FindFaceName( const name: string ): TFontFace;
Var
FaceIndex: LongInt;
Face: TFontFace;
begin
for FaceIndex := 0 to FontFaces.Count - 1 do
begin
Face := TFontFace(FontFaces[ FaceIndex ]);
if pos(UpperCase(name), UpperCase(Face.Name)) > 0 then
begin
Result := Face;
exit;
end;
end;
Result := nil;
end;
// Return the first font face of type = Outline (scalable)
//------------------------------------------------------------------------
function GetFirstOutlineFace( FixedWidth: boolean ): TFontFace;
Var
FaceIndex: LongInt;
Face: TFontFace;
begin
for FaceIndex := 0 to FontFaces.Count - 1 do
begin
Face := TFontFace(FontFaces[ FaceIndex ]);
if ( Face.FixedWidth = FixedWidth )
and ( Face.FontType = ftOutline ) then
begin
Result := Face;
exit;
end;
end;
Result := nil;
end;
// Find the bitmap font which best matches the given pointsize.
//------------------------------------------------------------------------
function GetClosestBitmapFixedFont( const PointSize: longint ): TLogicalFont;
Var
FaceIndex: Longint;
FontIndex: longint;
Face: TFontFace;
Font: TLogicalFont;
begin
Result := nil;
for FaceIndex := 0 to FontFaces.Count - 1 do
begin
Face := TFontFace(FontFaces[ FaceIndex ]);
if Face.FontType = ftBitmap then
begin
for FontIndex := 0 to Face.Sizes.Count - 1 do
begin
Font := TLogicalFont(Face.Sizes[ FontIndex ]);
if Font.FixedWidth then
begin
if ( Result = nil )
or ( Abs( Font.PointSize - PointSize )
< Abs( Result.PointSize - PointSize ) ) then
Result := Font;
end;
end;
end;
end;
end;
// Pick some nice default fonts.
//------------------------------------------------------------------------
procedure GetDefaultFonts;
begin
// courier new is common and reasonably nice
DefaultOutlineFixedFace := FindFaceName( 'Courier New' );
if DefaultOutlineFixedFace = nil then
begin
DefaultOutlineFixedFace := GetFirstOutlineFace( true ); // first fixed outline face
end;
DefaultOutlineProportionalFace := FindFaceName( DefaultTopicFont );
if DefaultOutlineProportionalFace = nil then
begin
DefaultOutlineProportionalFace := GetFirstOutlineFace( false ); // first prop outline face
end;
end;
// Fetch the global list of font faces and sizes
//------------------------------------------------------------------------
procedure GetFontList;
Var
Count: LongInt;
T: LongInt;
Font: TLogicalFont;
Face: TFontFace;
FamilyName: string;
fl: TStringList;
f: TfpgFont;
begin
fl := nil;
FontFaces := TList.Create;
fl := fpgApplication.GetFontFaceList;
// Get font count
Count := fl.Count;
If Count > 0 Then
Begin
For T := 0 To Count - 1 Do
Begin
Font := TLogicalFont.Create;
Font.FaceName := fl[T];
f := fpgGetFont(Font.FaceName + '-10');
if (pos('COURIER', UpperCase(Font.FaceName)) > 0) or (pos('MONO', UpperCase(Font.FaceName)) > 0) then
Font.FixedWidth := True;
Font.lAveCharWidth := f.TextWidth('g');
Font.lMaxbaselineExt := f.Height;
//Font.fsSelection := pfm^[ T ].fsSelection;
//Font.lMaxbaselineExt := pfm^[ T ].lMaxbaselineExt;
//Font.lAveCharWidth := pfm^[ T ].lAveCharWidth;
//Font.lMaxCharInc := pfm^[ T ].lMaxCharInc;
Font.ID := -1; // and always shall be so...
f.Free;
Face := FindFaceName( Font.FaceName );
if Face = nil then
begin
// new face found
Face := TFontFace.Create;
Face.Name := Font.FaceName; // point to the actual face name string!
Face.FixedWidth := Font.FixedWidth;
Face.FontType := Font.FontType;
FontFaces.Add( Face );
end;
Face.Sizes.Add( Font );
End;
End;
// pick some for defaults
GetDefaultFonts;
end;
// Add .subscript to font name for attributes
//------------------------------------------------------------------------
Function ModifyFontName( const FontName: string;
const Attrs: TFontAttributes ): String;
Begin
Result := FontName;
If faItalic in Attrs Then
Result := Result + '.Italic';
If faBold in Attrs Then
Result := Result + '.Bold';
If faOutline in Attrs Then
Result := Result + '.Outline';
If faStrikeOut in Attrs Then
Result := Result + '.Strikeout';
If faUnderScore in Attrs Then
Result := Result + '.Underscore';
End;
// Create a font without attributes
//------------------------------------------------------------------------
function CreateFontBasic( const FaceName: string; const PointSize: integer ): TLogicalFont;
var
PPString: string;
begin
Result := TLogicalFont.Create;
if FindFaceName( FaceName ) = nil then
Exit; //==>
Result.PointSize := PointSize; // will use later if the result was an outline font...
Result.FaceName := FaceName;
// OK now we have found the font face...
PPString := IntToStr( PointSize) + '.' + FaceName;
PPString := ModifyFontName( PPString, [] );
end;
// Provide outline substitutes for some common bitmap fonts
// From Mozilla/2 source.
//------------------------------------------------------------------------
function SubstituteBitmapFontToOutline( const FaceName: string ): string;
begin
if StringsSame( FaceName, 'Helv' ) then
result := DefaultTopicFont
else if StringsSame( FaceName, 'Helvetica' ) then
result := DefaultTopicFont
else if StringsSame( FaceName, 'Tms Rmn' ) then
result := 'Times New Roman'
else if StringsSame( FaceName, 'System Proportional' ) then
result := DefaultTopicFont
else if StringsSame( FaceName, 'System Monospaced' ) then
result := DefaultTopicFixedFont
else if StringsSame( FaceName, 'System VIO' ) then
result := DefaultTopicFixedFont
else
result := FaceName; // no substitution
end;
// Ask OS/2 dummy font window to convert a font spec
// into a FONTMETRICS.
//------------------------------------------------------------------------
//procedure AskOS2FontDetails( const FaceName: string;
// const PointSize: longint;
// const Attributes: TFontAttributes;
// var FontInfo: FONTMETRICS );
//var
// PPString: string;
// PresSpace: HPS;
//begin
// // Hack from Sibyl code - we don't know WTF the algorithm is
// // for selecting between outline/bitmap and doing substitutions
// // so send it to a dummy window and find out the resulting details
// PPString := IntToStr( PointSize )
// + '.'
// + FaceName;
//
// PPString := ModifyFontName( PPString, Attributes );
//
// FontWindow.SetPPFontNameSize( PPString );
//
// PresSpace := WinGetPS( FontWindow.Handle );
// GpiQueryFontMetrics( PresSpace,
// SizeOf( FontInfo ),
// FontInfo );
// WinReleasePS( PresSpace );
//end;
// Look for the best match for the given face, size and attributes.
// If FixedWidth is set then makes sure that the result is fixed
// (if there is any fixed font on the system at all!)
// This uses the OS/2 GPI and therefore makes some substitutions,
// such as Helv 8 (bitmap) for Helvetica 8 (outline)
//------------------------------------------------------------------------
procedure FindBestFontMatch( const FaceName: string;
const PointSize: longint;
const Attributes: TFontAttributes;
const FixedWidth: boolean;
var FontInfo: string );
var
BestBitmapFontMatch: TLogicalFont;
fl: TStringList;
i: integer;
begin
{ TODO -oGraeme -cfonts : This hack is very quick and dirty. Needs to be refined a lot }
fl := fpgApplication.GetFontFaceList;
for i := 0 to fl.Count-1 do
begin
if Pos(FaceName, fl[i]) > 0 then
FontInfo := fl[i] + '-' + IntToStr(PointSize);
end;
if Fontinfo = '' then
// nothing found se use default font of fpGUI
FontInfo := fpgApplication.DefaultFont.FontDesc;
end;
//------------------------------------------------------------------------
// Font manager
//------------------------------------------------------------------------
// constructor
//------------------------------------------------------------------------
constructor TCanvasFontManager.Create(Canvas: TfpgCanvas; AllowBitmapFonts: boolean;
AWidget: TfpgWidget);
begin
inherited Create;
if FontFaces = nil then
GetFontList;
FCanvas := Canvas;
FWidget := AWidget;
FLogicalFonts := TList.Create;
// get system default font spec
// as default default ;)
FPGuiFontToFontSpec( fpgApplication.DefaultFont, FDefaultFontSpec );
if FDefaultFontSpec.FaceName = '' then
raise Exception.Create('For some reason we could not create a FDefaultFontSpec instance');
// FCurrentFontSpec.FaceName := 'Arial';
FCurrentFontSpec.FaceName := FDefaultFontSpec.FaceName;
FCurrentFont := nil;
FAllowBitmapFonts := AllowBitmapFonts;
end;
// Destructor
//------------------------------------------------------------------------
destructor TCanvasFontManager.Destroy;
var
i: integer;
lFont: TLogicalFont;
lface: TFontFace;
begin
// select default font so none of our logical fonts are in use
FCanvas.Font := fpgApplication.DefaultFont;
// delete each logical font and our record of it
for i := 0 to FLogicalFonts.Count - 1 do
begin
lFont := TLogicalFont(FLogicalFonts[ i ]);
lFont.Free;
end;
FLogicalFonts.Clear;
FLogicalFonts.Free;
// TCanvasFontManager asked for FontFaces to be created, so lets take responsibility to destroy it.
for i := 0 to FontFaces.Count-1 do
begin
lface := TFontFace(Fontfaces[i]);
lface.Free;
end;
FontFaces.Clear;
FontFaces.Free;
inherited Destroy;
end;
// Create a logical font for the given spec
//------------------------------------------------------------------------
function TCanvasFontManager.CreateFont( const FontSpec: TFontSpec ): TLogicalFont;
var
UseFaceName: string;
Face: TFontFace;
RemoveBoldFromSelection: boolean;
RemoveItalicFromSelection: boolean;
UseAttributes: TFontAttributes;
MatchAttributes: TFontAttributes;
BaseFont: TLogicalFont;
BaseFontIsBitmapFont: Boolean;
FontInfo: string;
FixedWidth: boolean;
begin
ProfileEvent('>>>> TCanvasFontManager.CreateFont >>>>');
Face := nil;
RemoveBoldFromSelection := false;
RemoveItalicFromSelection := false;
UseAttributes := FontSpec.Attributes;
// see if the originally specified font is a fixed width one.
FixedWidth := false;
Face := FindFaceName( FontSpec.FaceName );
if Face <> nil then
FixedWidth := Face.FixedWidth;
Face := nil;
if not FAllowBitmapFonts then
UseFaceName := SubstituteBitmapFontToOutline( FontSpec.FaceName )
else
UseFaceName := FontSpec.FaceName;
ProfileEvent('UseFaceName=' + UseFaceName);
if FontSpec.Attributes <> [] then
begin
profileevent('FontSpec.Attributes are not blank');
BaseFontIsBitmapFont := false;
if FAllowBitmapFonts then
begin
// First see if the base font (without attributes)
// would be a bitmap font...
BaseFont := CreateFontBasic( UseFaceName, FontSpec.PointSize );
if BaseFont <> nil then
begin
BaseFontIsBitmapFont := BaseFont.FontType = ftBitmap;
BaseFont.Destroy;
end;
end;
If not BaseFontIsBitmapFont Then
begin
profileevent('we seem to be looking for a outline font');
// Result is an outline font so look for specific bold/italic fonts
if ( faBold in FontSpec.Attributes )
and ( faItalic in FontSpec.Attributes ) then
begin
Face := FindFaceName( UseFaceName + ' BOLD ITALIC' );
if Face <> nil then
begin
Exclude( UseAttributes, faBold );
Exclude( UseAttributes, faItalic );
RemoveBoldFromSelection := true;
RemoveItalicFromSelection := true;
end;
end;
if Face = nil then
if faBold in FontSpec.Attributes then
begin
Face := FindFaceName( UseFaceName + ' BOLD' );
if Face <> nil then
begin
Exclude( UseAttributes, faBold );
RemoveBoldFromSelection := true;
end;
end;
if Face = nil then
if faItalic in FontSpec.Attributes then
begin
Face := FindFaceName( UseFaceName + ' ITALIC' );
if Face <> nil then
begin
Exclude( UseAttributes, faItalic );
RemoveItalicFromSelection := true;
end;
end;
end;
end;
if Face <> nil then
// found a styled face, does it match fixed width?
if Face.FixedWidth <> FixedWidth then
// no so we don't want to use it.
Face := nil;
if Face = nil then
// didn't find a styled face (or no styles set)
// so find unmodified, we will use simulation bits
Face := FindFaceName( UseFaceName );
// Oh shit!
if Face = nil then
// didn't find a styled face (or no styles set)
// so find unmodified, we will use simulation bits
Face := FindFaceName( 'Sans' ); // something very generic
if not FAllowBitmapFonts then
if Assigned(Face) and (Face.FontType = ftBitmap) then
// we aren't allowed bitmaps, but that's what this
// face is. So use the default outline face of the
// appropriate width type
if FixedWidth then
Face := DefaultOutlineFixedFace
else
Face := DefaultOutlineProportionalFace;
if Face = nil then
begin
profileevent('Could not find the specified font name. Bummer! + early exit');
// Could not find the specified font name. Bummer.
Result := nil;
exit;
end;
profileevent('******* Now create the TLogicalFont instance');
// OK now we have found the font face...
Result := TLogicalFont.Create;
Result.PointSize := FontSpec.PointSize; // will use later if the result was an outline font...
Result.FaceName := FontSpec.FaceName;
Result.UseFaceName := Face.Name;
Result.Attributes := FontSpec.Attributes;
Result.fsSelection := 0;
Result.FixedWidth := Face.FixedWidth;
if FAllowBitmapFonts then
begin
if BaseFontIsBitmapFont then
MatchAttributes := []
else
MatchAttributes := UseAttributes;
FindBestFontMatch( Face.Name,
FontSpec.PointSize,
MatchAttributes,
FixedWidth,
FontInfo );
Result.UseFaceName := FontInfo;
end
else
begin
// no bitmap fonts please.
Result.FontType := ftOutline
end;
// store the baseline and average char width.
// For bitmap fonts, these tell GPI which font we really want
// For outline fonts, we are just storing them for later ref.
//Result.lMaxbaseLineExt := FontInfo.lMaxbaselineExt;
//Result.lAveCharWidth := FontInfo.lAveCharWidth;
//Result.lMaxCharInc := FontInfo.lMaxCharInc;
Result.lMaxBaseLineExt := FontSpec.YSize;
Result.lAveCharWidth := FontSpec.XSize;
Result.lMaxCharInc := FontSpec.XSize;
// Set style flags
with Result do
begin
//If faBold in UseAttributes Then
// fsSelection := fsSelection or FM_SEL_BOLD;
//If faItalic in UseAttributes Then
// fsSelection := fsSelection or FM_SEL_ITALIC;
//If faUnderScore in UseAttributes Then
// fsSelection := fsSelection or FM_SEl_UNDERSCORE;
//If faStrikeOut in UseAttributes Then
// fsSelection := fsSelection or FM_SEl_STRIKEOUT;
//If faOutline in UseAttributes Then
// fsSelection := fsSelection or FM_SEl_OUTlINE;
end;
profileevent(' Result.FaceName=' + Result.FaceName);
profileevent(' Result.PointSize=' + IntToStr(Result.PointSize));
profileevent(' Result.UseFaceName=' + Result.UseFaceName);
Result.pCharWidthArray := Nil;
ProfileEvent('<<<< TCanvasFontManager.CreateFont');
end;
// Register the given logical font with GPI and store for later use
//------------------------------------------------------------------------
procedure TCanvasFontManager.RegisterFont( Font: TLogicalFont );
var
// fa: FATTRS;
rc: longint;
begin
FLogicalFonts.Add( Font );
Font.ID := FLogicalFonts.Count + 1; // add 1 to stay out of Sibyl's way
//// Initialise GPI font attributes
//FillChar( fa, SizeOf( FATTRS ), 0 );
//fa.usRecordLength := SizeOf( FATTRS );
//
//// Copy facename and 'simulation' attributes from what we obtained
//// earlier
//fa.szFaceName := Font.pUseFaceName^;
//fa.fsSelection := Font.fsSelection;
//
//fa.lMatch := 0; // please Mr GPI be helpful and do clever stuff for us, we are ignorant
//
//fa.idRegistry := 0; // IBM magic number
//fa.usCodePage := 0; // use current codepage
//
//If Font.FontType = ftOutline then
// // Outline font wanted
// fa.fsFontUse := FATTR_FONTUSE_OUTLINE Or FATTR_FONTUSE_TRANSFORMABLE
//else
// // bitmap font
// fa.fsFontUse := 0;
//
//// don't need mixing with graphics (for now)
//fa.fsFontUse := fa.fsFontUse or FATTR_FONTUSE_NOMIX;
//
//// copy char cell width/height from the (valid) one we
//// found earlier in GetFont (will be zero for outline)
//fa.lMaxbaseLineExt := Font.lMaxbaselineExt;
//fa.lAveCharWidth := Font.lAveCharWidth;
//
//fa.fsType := 0;
//
//// create logical font
//rc := GpiCreateLogFont( FCanvas.Handle,
// nil,
// Font.ID,
// fa );
end;
// Select the given (existing) logical font
//------------------------------------------------------------------------
procedure TCanvasFontManager.SelectFont( Font: TLogicalFont;
Scale: longint );
var
f: TfpgFont;
s: string;
begin
// Select the logical font
if Font.FontType = ftOutline then
begin
s := Font.FaceName + '-' + IntToStr(Font.PointSize);
if faBold in Font.Attributes then
s := s + ':bold';
if faItalic in Font.Attributes then
s := s + ':italic';
if faUnderScore in Font.Attributes then
s := s + ':underline';
f := fpgGetFont(s);
FCanvas.Font := f;
end;
end;
// Get a font to match the given spec, creating or re-using an
// existing font as needed.
//------------------------------------------------------------------------
function TCanvasFontManager.GetFont( const FontSpec: TFontSpec ): TLogicalFont;
var
AFont: TLogicalFont;
FontIndex: integer;
sub: string;
begin
ProfileEvent('DEBUG: TCanvasFontManager.GetFont >>>');
ProfileEvent('Received FontSpec: Facename=' + FontSpec.FaceName);
ProfileEvent(' PointSize=' + IntToStr(FontSpec.PointSize));
ProfileEvent('FLogicalFonts.Count=' + intToStr(FLogicalFonts.Count));
try
for FontIndex := 0 to FLogicalFonts.Count - 1 do
begin
AFont := TLogicalFont(FLogicalFonts[ FontIndex ]);
if AFont.PointSize = FontSpec.PointSize then
begin
if ( AFont.PointSize > 0 )
or ( ( AFont.lAveCharWidth = FontSpec.XSize )
and ( AFont.lMaxbaselineExt = FontSpec.YSize ) ) then
begin
if AFont.Attributes = FontSpec.Attributes then
begin
// search name last since it's the slowest thing
//ProfileEvent(' AFont.UseFaceName=' + AFont.UseFaceName);
//ProfileEvent(' FontSpec.FaceName=' + FontSpec.FaceName);
if AFont.FaceName = FontSpec.FaceName then
begin
// Found a logical font already created
Result := AFont;
// done
exit;
end
else
begin
// Still nothing! Lets try known substitute font names
sub := SubstituteBitmapFontToOutline(FontSpec.FaceName);
ProfileEvent(' substitute font=' + sub);
if AFont.FaceName = sub then
begin
// Found a logical font already created
Result := AFont;
// done
profileevent('TCanvasFontManager.GetFont <<<<< exit early we found a font');
exit;
end;
end;
end;
end;
end;
end;
except
{ TODO -oGraeme -cknow bug : An Access Violation error occurs often here! No idea why? }
on E: Exception do
ProfileEvent('Unexpected error occured. Error: ' + E.Message);
end;
ProfileEvent('Now we need to create a new logical font');
// Need to create new logical font
Result := CreateFont( FontSpec );
if Result <> nil then
begin
RegisterFont( Result );
end;
ProfileEvent('DEBUG: TCanvasFontManager.GetFont <<<');
end;
// Set the current font for the canvas to match the given
// spec, creating or re-using fonts as needed.
//------------------------------------------------------------------------
procedure TCanvasFontManager.SetFont( const FontSpec: TFontSpec );
var
Font: TLogicalFont;
lDefaultFontSpec: TFontSpec;
begin
ProfileEvent('DEBUG: TCanvasFontManager.SetFont >>>>');
if (FCurrentFontSpec.FaceName = FontSpec.FaceName) and
(FCurrentFontSpec.PointSize = FontSpec.PointSize) and
(FCurrentFontSpec.Attributes = FontSpec.Attributes) then
// same font
exit;
Font := GetFont( FontSpec );
if Font = nil then
begin
// ack! Pfffbt! Couldn't find the font.
// Try to get the default font
// writeln('---------- here goes nothing -------------');
Font := GetFont( FDefaultFontSpec );
if Font = nil then
begin
writeln('******* We should never get here!!!! Defaut font should always exist.');
writeln('FDefaultFontSpec:');
writeln(' FaceName=', FDefaultFontSpec.FaceName);
writeln(' Size=', FDefaultFontSpec.PointSize);
FPGuiFontToFontSpec( fpgApplication.DefaultFont, lDefaultFontSpec );
Font := GetFont( lDefaultFontSpec );
if Font = nil then
// Jimminy! We can't even get the default system font
raise Exception.Create( 'Could not access default font '
+ 'in place of '
+ FontSpec.FaceName
+ ' '
+ IntToStr( FontSpec.PointSize ) );
end;
end;
SelectFont( Font, 1 );
FCurrentFontSpec := FontSpec;
FCurrentFont.Free;
FCurrentFont := Font;
ProfileEvent('DEBUG: TCanvasFontManager.SetFont <<<<');
end;
// Get the widths of all characters for current font
// and other dimensions
//------------------------------------------------------------------------
procedure TCanvasFontManager.LoadMetrics;
var
TheChar: Char;
begin
// Retrieve all character widths
if FCurrentFont.FontType = ftOutline then
begin
SelectFont( FCurrentFont, FontWidthPrecisionFactor );
end;
// allocate memory for storing the char widths
GetMem( FCurrentFont.pCharWidthArray, sizeof( TCharWidthArray ) );
for TheChar := #0 to #255 do
begin
FCurrentFont.pCharWidthArray^[ TheChar ] := Abs( FCurrentFont.pCharWidthArray^[ TheChar ] );
end;
if FCurrentFont.FontType = ftOutline then
begin
SelectFont( FCurrentFont, 1 );
end
else
begin
// For bitmap fonts, multiply by 256 manually
for TheChar := #0 to #255 do
begin
FCurrentFont.pCharWidthArray^[ TheChar ] := FCurrentFont.pCharWidthArray^[ TheChar ];
end;
end;
end;
procedure TCanvasFontManager.EnsureMetricsLoaded;
begin
if FCurrentFont = nil then
raise( Exception.Create( 'No font selected before getting font metrics' ) );
if FCurrentFont.pCharWidthArray = Nil then
LoadMetrics;
end;
function TCanvasFontManager.CharWidth( const C: Char ): longint;
var
f: TfpgFont;
begin
// EnsureMetricsLoaded;
// Result := FCurrentFont.pCharWidthArray^[ C ];
{ TODO -ograeme : This needs improvement: what about font attributes, and performance. }
f := fpgGetFont(FCurrentFont.FaceName + '-' + IntToStr(FCurrentFont.PointSize));
Result := f.TextWidth(C);
f.Free;
end;
function TCanvasFontManager.AverageCharWidth: longint;
begin
EnsureMetricsLoaded;
Result := FCurrentFont.lAveCharWidth;
end;
function TCanvasFontManager.MaximumCharWidth: longint;
begin
EnsureMetricsLoaded;
Result := FCurrentFont.lMaxCharInc;
end;
function TCanvasFontManager.CharHeight: longint;
begin
EnsureMetricsLoaded;
Result := FCurrentFont.lMaxBaseLineExt;
end;
function TCanvasFontManager.CharDescender: longint;
begin
EnsureMetricsLoaded;
Result := FCurrentFont.lMaxDescender;
end;
function TCanvasFontManager.IsFixed: boolean;
begin
Result := FCurrentFont.FixedWidth;
end;
procedure TCanvasFontManager.DrawString(var Point: TPoint; const Length: longint; const S: PChar);
var
t: string;
// Seaches <AValue> and replaces <ADel> with <AIns>. Case sensitive.
function tiStrTran(AValue, ADel, AIns : string): string;
var
i : integer;
sToChange : string;
begin
result := '';
sToChange := AValue;
i := UTF8Pos(ADel, sToChange);
while i <> 0 do
begin
result := result + UTF8Copy(sToChange, 1, i-1) + AIns;
UTF8Delete(sToChange, 1, i+UTF8length(ADel)-1);
i := UTF8Pos(ADel, sToChange);
end;
result := result + sToChange;
end;
begin
t := s;
// Hack Alert #2: replace strange table chars with something we can actually see
//t := SubstituteChar(t, Chr(218), Char('+') ); // top-left corner
//t := SubstituteChar(t, Chr(196), Char('-') ); // horz row deviders
//t := SubstituteChar(t, Chr(194), Char('-') ); // centre top T connection
//t := SubstituteChar(t, Chr(191), Char('+') ); // top-right corner
//t := SubstituteChar(t, Chr(192), Char('+') ); // bot-left corner
//t := SubstituteChar(t, Chr(193), Char('-') ); // centre bottom inverted T
//t := SubstituteChar(t, Chr(197), Char('+') );
//t := SubstituteChar(t, Chr(179), Char('|') ); //
//t := SubstituteChar(t, Chr(195), Char('|') );
//t := SubstituteChar(t, Chr(180), Char('|') );
//t := SubstituteChar(t, Chr(217), Char('+') ); // bot-right corner
// it's cheaper to first check for the char than actually running full tiStrTran
// CodePage 437 (kind-of) to Unicode mapping
t := tiStrTran(t, Char(16), '>' );
t := tiStrTran(t, Char(17), '<' );
t := tiStrTran(t, Char($1f), '▼' );
// if pos(t, Char(179)) > 0 then
t := tiStrTran(t, Char(179), '│' );
// if pos(t, Char(180)) > 0 then
t := tiStrTran(t, Char(180), '┤' );
// if pos(t, Char(191)) > 0 then
t := tiStrTran(t, Char(191), '┐' );
// if pos(t, Char(192)) > 0 then
t := tiStrTran(t, Char(192), '└' );
// if pos(t, Char(193)) > 0 then
t := tiStrTran(t, Char(193), '┴' );
// if pos(t, Char(194)) > 0 then
t := tiStrTran(t, Char(194), '┬' );
// if pos(t, Char(195)) > 0 then
t := tiStrTran(t, Char(195), '├' );
// if pos(t, Char(196)) > 0 then
t := tiStrTran(t, Char(196), '─' );
// if pos(t, Char(197)) > 0 then
t := tiStrTran(t, Char(197), '┼' );
// if pos(t, Char(217)) > 0 then
t := tiStrTran(t, Char(217), '┘' );
// if pos(t, Char(218)) > 0 then
t := tiStrTran(t, Char(218), '┌' );
FCanvas.DrawString(Point.X, Point.Y, t);
Point.x := Point.X + Canvas.Font.TextWidth(t);
end;
end.
|