mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
synced 2025-05-15 19:02:39 +02:00
LazFreeType: Patch by "circular":
- extended characters handled correctly - bug fix in case freetype font collection is freed before the drawer (added listeners when font collection item is destroyed) - SetDefaultFreeTypeFontCollection in LazFreeTypeFontCollection unit, so it is not necessary to mention EasyLazFreeType in uses clause if font collection is used - textrect and wordwrap for freetype git-svn-id: trunk@40104 -
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@ -27,7 +27,7 @@ type
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yTop,yBase,yBottom: single;
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end;
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ArrayOfCharPosition = array of TCharPosition;
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TFreeTypeAlignment = (ftaLeft,ftaCenter,ftaRight,ftaJustify,ftaTop,ftaBaseline,ftaBottom);
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TFreeTypeAlignment = (ftaLeft,ftaCenter,ftaRight,ftaJustify,ftaTop,ftaVerticalCenter,ftaBaseline,ftaBottom);
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TFreeTypeAlignments = set of TFreeTypeAlignment;
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TFreeTypeInformation = (ftiCopyrightNotice, ftiFamily, ftiStyle, ftiIdentifier, ftiFullName,
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@ -36,6 +36,7 @@ type
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TFreeTypeStyle = (ftsBold, ftsItalic);
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TFreeTypeStyles = set of TFreeTypeStyle;
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TFreeTypeWordBreakHandler = procedure(var ABefore, AAfter: string) of object;
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const
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FreeTypeInformationStr : array[TFreeTypeInformation] of string =
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@ -47,6 +48,9 @@ type
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TFreeTypeGlyph = class;
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TFreeTypeFont = class;
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TFontCollectionItemDestroyListener = procedure() of object;
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ArrayOfFontCollectionItemDestroyListener = array of TFontCollectionItemDestroyListener;
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TCustomFontCollectionItem = class
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protected
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function GetBold: boolean; virtual; abstract;
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@ -57,11 +61,12 @@ type
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function GetFilename: string; virtual; abstract;
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function GetVersionNumber: string; virtual; abstract;
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function GetStyle(AIndex: integer): string; virtual; abstract;
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procedure NotifyDestroy; virtual; abstract;
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public
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function HasStyle(AStyle: string): boolean; virtual; abstract;
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function CreateFont: TFreeTypeFont; virtual; abstract;
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function QueryFace: TT_Face; virtual; abstract;
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procedure ReleaseFace; virtual; abstract;
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function QueryFace(AListener: TFontCollectionItemDestroyListener): TT_Face; virtual; abstract;
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procedure ReleaseFace(AListener: TFontCollectionItemDestroyListener); virtual; abstract;
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property Styles: string read GetStyles;
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property Italic: boolean read GetItalic;
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@ -138,16 +143,19 @@ type
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TFreeTypeRenderableFont = class
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protected
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FWordBreakHandler: TFreeTypeWordBreakHandler;
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function GetClearType: boolean; virtual; abstract;
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procedure SetClearType(const AValue: boolean); virtual; abstract;
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function GetLineFullHeight: single; virtual; abstract;
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function GetAscent: single; virtual; abstract;
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function GetDescent: single; virtual; abstract;
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function GetLineSpacing: single; virtual; abstract;
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procedure DefaultWordBreakHandler(var ABefore, AAfter: string);
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public
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function TextWidth(AText: string): single; virtual; abstract;
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function TextHeight(AText: string): single; virtual; abstract;
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function CharWidthFromUnicode(AUnicode: integer): single; virtual; abstract;
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procedure SplitText(var AText: string; AMaxWidth: single; out ARemains: string);
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procedure GetTextSize(AText: string; out w,h: single); virtual;
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procedure RenderText(AText: string; x,y: single; ARect: TRect; OnRender : TDirectRenderingFunction); virtual; abstract;
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property ClearType: boolean read GetClearType write SetClearType;
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@ -155,6 +163,7 @@ type
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property Descent: single read GetDescent;
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property LineSpacing: single read GetLineSpacing;
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property LineFullHeight: single read GetLineFullHeight;
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property OnWordBreak: TFreeTypeWordBreakHandler read FWordBreakHandler write FWordBreakHandler;
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end;
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{ TFreeTypeDrawer }
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@ -164,6 +173,8 @@ type
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procedure DrawText(AText: string; AFont: TFreeTypeRenderableFont; x,y: single; AColor: TFPColor; AOpacity: Byte; AAlign: TFreeTypeAlignments); virtual; overload;
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procedure DrawText(AText: string; AFont: TFreeTypeRenderableFont; x,y: single; AColor: TFPColor); virtual; abstract; overload;
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procedure DrawText(AText: string; AFont: TFreeTypeRenderableFont; x,y: single; AColor: TFPColor; AAlign: TFreeTypeAlignments); virtual; overload;
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procedure DrawTextWordBreak(AText: string; AFont: TFreeTypeRenderableFont; x, y, AMaxWidth: Single; AColor: TFPColor; AAlign: TFreeTypeAlignments);
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procedure DrawTextRect(AText: string; AFont: TFreeTypeRenderableFont; X1,Y1,X2,Y2: Single; AColor: TFPColor; AAlign: TFreeTypeAlignments);
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end;
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{********************************* Font implementation **********************************}
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@ -224,6 +235,7 @@ type
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function GetAscent: single; override;
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function GetDescent: single; override;
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function GetLineSpacing: single; override;
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procedure OnDestroyFontItem;
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procedure FetchNames;
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function GetCollection: TCustomFreeTypeFontCollection;
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public
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@ -232,8 +244,11 @@ type
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constructor Create;
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destructor Destroy; override;
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procedure RenderText(AText: string; x,y: single; ARect: TRect; OnRender : TDirectRenderingFunction); override;
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procedure SetNameAndStyle(AName: string; AStyle: string); overload;
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procedure SetNameAndStyle(AName: string; AStyle: TFreeTypeStyles); overload;
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function TextWidth(AText: string): single; override;
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function TextHeight(AText: string): single; override;
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function CharWidthFromUnicode(AUnicode: integer): single; override;
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function CharsWidth(AText: string): ArrayOfSingle;
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function CharsPosition(AText: string): ArrayOfCharPosition; overload;
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function CharsPosition(AText: string; AAlign: TFreeTypeAlignments): ArrayOfCharPosition; overload;
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@ -401,6 +416,75 @@ end;
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{ TFreeTypeRenderableFont }
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procedure TFreeTypeRenderableFont.DefaultWordBreakHandler(var ABefore,
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AAfter: string);
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var p: integer;
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begin
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if (AAfter <> '') and (ABefore <> '') and (AAfter[1]<> ' ') and (ABefore[length(ABefore)] <> ' ') then
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begin
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p := length(ABefore);
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while (p > 1) and (ABefore[p-1] <> ' ') do dec(p);
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if p > 1 then //can put the word after
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begin
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AAfter := copy(ABefore,p,length(ABefore)-p+1)+AAfter;
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ABefore := copy(ABefore,1,p-1);
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end else
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begin //cannot put the word after, so before
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end;
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end;
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while (ABefore <> '') and (ABefore[length(ABefore)] =' ') do delete(ABefore,length(ABefore),1);
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while (AAfter <> '') and (AAfter[1] =' ') do delete(AAfter,1,1);
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end;
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procedure TFreeTypeRenderableFont.SplitText(var AText: string;
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AMaxWidth: single; out ARemains: string);
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var
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pstr: pchar;
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left,charlen: integer;
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totalWidth: single;
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firstChar: boolean;
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glyphWidth: single;
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glyphCode: cardinal;
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begin
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totalWidth := 0;
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if AText = '' then
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begin
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ARemains := '';
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exit;
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end else
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begin
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pstr := @AText[1];
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left := length(AText);
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firstChar := true;
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while left > 0 do
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begin
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charlen := UTF8CharacterLength(pstr);
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glyphCode := UTF8CharacterToUnicode(pstr, charlen);
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inc(pstr,charlen);
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glyphWidth := CharWidthFromUnicode(glyphCode);
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if glyphWidth <> 0 then
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begin
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totalWidth += glyphWidth;
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if (totalWidth > AMaxWidth) and not firstChar then
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begin
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ARemains:= copy(AText,length(AText)-left+1,left);
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AText := copy(AText, 1, length(AText)-left);
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if Assigned(FWordBreakHandler) then
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FWordBreakHandler(AText,ARemains) else
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DefaultWordBreakHandler(AText,ARemains);
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exit;
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end;
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end;
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dec(left,charlen);
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firstChar := false;
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end;
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end;
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ARemains := ''; //no split
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end;
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procedure TFreeTypeRenderableFont.GetTextSize(AText: string; out w, h: single);
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begin
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w := TextWidth(AText);
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@ -436,9 +520,11 @@ begin
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if ftaTop in AAlign then
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y += AFont.Ascent else
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if ftaBottom in AAlign then
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y -= AFont.TextHeight(AText) - AFont.Ascent;
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y += AFont.Ascent - AFont.TextHeight(AText) else
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if ftaVerticalCenter in AAlign then
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y += AFont.Ascent - AFont.TextHeight(AText)*0.5;
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end;
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AAlign -= [ftaTop,ftaBaseline,ftaBottom];
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AAlign -= [ftaTop,ftaBaseline,ftaBottom,ftaVerticalCenter];
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idx := pos(LineEnding, AText);
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while idx <> 0 do
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@ -459,6 +545,76 @@ begin
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DrawText(AText, AFont, x,y, AColor);
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end;
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procedure TFreeTypeDrawer.DrawTextWordBreak(AText: string;
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AFont: TFreeTypeRenderableFont; x, y, AMaxWidth: Single;
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AColor: TFPColor; AAlign: TFreeTypeAlignments);
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var ARemains: string;
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stepX,stepY: single;
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lines: TStringList;
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i: integer;
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lineShift: single;
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lineAlignment: TFreeTypeAlignments;
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begin
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if (AText = '') or (AMaxWidth <= 0) then exit;
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stepX := 0;
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stepY := AFont.LineFullHeight;
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AAlign -= [ftaBaseline]; //ignored
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if AAlign * [ftaTop,ftaVerticalCenter,ftaBottom] = [] then AAlign += [ftaTop]; //top by default
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lineAlignment := AAlign * [ftaLeft,ftaCenter,ftaRight] + [ftaVerticalCenter];
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if ftaTop in AAlign then
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begin
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lineShift := 0.5;
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X += stepX*lineShift;
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Y += stepY*lineShift;
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repeat
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AFont.SplitText(AText, AMaxWidth, ARemains);
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DrawText(AText,AFont,X,Y,AColor,lineAlignment);
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AText := ARemains;
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X+= stepX;
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Y+= stepY;
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until ARemains = '';
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end else
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begin
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lines := TStringList.Create;
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repeat
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AFont.SplitText(AText, AMaxWidth, ARemains);
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lines.Add(AText);
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AText := ARemains;
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until ARemains = '';
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if ftaVerticalCenter in AAlign then lineShift := lines.Count/2-0.5
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else if ftaBottom in AAlign then lineShift := lines.Count-0.5
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else lineShift := -0.5;
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X -= stepX*lineShift;
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Y -= stepY*lineShift;
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for i := 0 to lines.Count-1 do
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begin
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DrawText(lines[i],AFont,X,Y,AColor,lineAlignment);
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X+= stepX;
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Y+= stepY;
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end;
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lines.Free;
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end;
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end;
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procedure TFreeTypeDrawer.DrawTextRect(AText: string;
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AFont: TFreeTypeRenderableFont; X1, Y1, X2, Y2: Single; AColor: TFPColor;
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AAlign: TFreeTypeAlignments);
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var X,Y: single;
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begin
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if X2 <= X1 then exit;
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if ftaVerticalCenter in AAlign then Y := (Y1+Y2)/2 else
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if ftaBottom in AAlign then Y := Y2 else
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Y := Y1;
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if ftaCenter in AAlign then X := (X1+X2)/2 else
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if ftaRight in AAlign then X := X2 else
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X := X1;
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DrawTextWordBreak(AText,AFont,X,Y,X2-X1,AColor,AAlign);
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end;
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{ TFreeTypeGlyph }
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{$hints off}
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@ -600,7 +756,7 @@ begin
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fontItem := familyItem.GetFont(FStyleStr);
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if fontItem = nil then
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raise exception.Create('Font style not found');
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FFace := fontItem.QueryFace;
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FFace := fontItem.QueryFace(@OnDestroyFontItem);
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FFaceItem := fontItem;
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end;
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@ -744,6 +900,11 @@ begin
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result := FLineGapValue*SizeInPixels;
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end;
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procedure TFreeTypeFont.OnDestroyFontItem;
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begin
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DiscardFace;
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end;
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function TFreeTypeFont.GetPixelSize: single;
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begin
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result := SizeInPoints * DPI / 72;
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@ -812,6 +973,7 @@ end;
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procedure TFreeTypeFont.SetStyleAsString(AValue: string);
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begin
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AValue := Trim(AValue);
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if FStyleStr=AValue then Exit;
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FStyleStr:=AValue;
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UpdateFace(FName);
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@ -824,7 +986,7 @@ begin
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DiscardInstance;
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if FFaceItem <> nil then
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begin
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FFaceItem.ReleaseFace;
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FFaceItem.ReleaseFace(@OnDestroyFontItem);
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FFaceItem := nil;
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end
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else
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@ -1087,6 +1249,24 @@ begin
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end;
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end;
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procedure TFreeTypeFont.SetNameAndStyle(AName: String; AStyle: string);
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begin
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AStyle := Trim(AStyle);
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if (AName = FName) and (AStyle = FStyleStr) then exit;
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FName := AName;
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FStyleStr := AStyle;
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UpdateFace(FName);
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end;
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procedure TFreeTypeFont.SetNameAndStyle(AName: string; AStyle: TFreeTypeStyles);
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var styleStr: string;
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begin
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styleStr := '';
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if ftsBold in AStyle then styleStr += 'Bold ';
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if ftsItalic in AStyle then styleStr += 'Italic ';
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SetNameAndStyle(AName, Trim(styleStr));
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end;
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function TFreeTypeFont.TextWidth(AText: string): single;
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var
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pstr: pchar;
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@ -1155,6 +1335,16 @@ begin
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end;
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end;
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function TFreeTypeFont.CharWidthFromUnicode(AUnicode: integer): single;
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var g: TFreeTypeGlyph;
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begin
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g := Glyph[CharIndex[AUnicode]];
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if g = nil then result := 0
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else
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result := g.Advance;
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if FClearType then result /= 3;
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end;
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function TFreeTypeFont.CharsWidth(AText: string): ArrayOfSingle;
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var
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pstr: pchar;
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@ -1234,13 +1424,13 @@ begin
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resultIndex := 0;
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resultLineStart := 0;
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if ftaLeft in AAlign then AAlign -= [ftaLeft, ftaCenter, ftaRight];
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if ftaBaseline in AAlign then AAlign -= [ftaTop, ftaBaseline, ftaBottom];
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if ftaBaseline in AAlign then AAlign -= [ftaTop, ftaBaseline, ftaBottom, ftaVerticalCenter];
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curX := 0;
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y := 0;
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if ftaTop in AAlign then
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begin
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y += Ascent;
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AAlign -= [ftaTop, ftaBottom];
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AAlign -= [ftaTop, ftaBottom, ftaVerticalCenter];
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end;
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yTopRel := -Ascent;
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yBottomRel := Descent;
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@ -1325,6 +1515,17 @@ begin
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yBase -= y;
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yBottom -= y;
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end;
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end else
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if ftaVerticalCenter in AAlign then
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begin
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y += LineFullHeight/2-Ascent;
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for i := 0 to high(result) do
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with result[i] do
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begin
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yTop -= y;
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yBase -= y;
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yBottom -= y;
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end;
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end;
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end;
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@ -19,6 +19,7 @@ type
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FFace: TT_Face;
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FFaceUsage: integer;
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FUsePostscriptStyle: boolean;
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FDestroyListeners: array of TFontCollectionItemDestroyListener;
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procedure UpdateStyles;
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procedure SetInformation(AIndex: TFreeTypeInformation; AValue: string);
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procedure SetUsePostscriptStyle(AValue: boolean);
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@ -31,6 +32,7 @@ type
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function GetStyles: string; override;
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function GetStyle(AIndex: integer): string; override;
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function GetVersionNumber: string; override;
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procedure NotifyDestroy; override;
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public
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constructor Create(AFilename: string);
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destructor Destroy; override;
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@ -38,8 +40,8 @@ type
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property Information[AIndex: TFreeTypeInformation]: string read GetInformation write SetInformation;
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property VersionNumber: string read GetVersionNumber write FVersionNumber;
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function CreateFont: TFreeTypeFont; override;
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function QueryFace: TT_Face; override;
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procedure ReleaseFace; override;
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function QueryFace(AListener: TFontCollectionItemDestroyListener): TT_Face; override;
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procedure ReleaseFace(AListener: TFontCollectionItemDestroyListener); override;
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property UsePostscriptStyle: boolean read FUsePostscriptStyle write SetUsePostscriptStyle;
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end;
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@ -108,6 +110,8 @@ type
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function FamilyEnumerator: IFreeTypeFamilyEnumerator; override;
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end;
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procedure SetDefaultFreeTypeFontCollection(ACollection : TCustomFreeTypeFontCollection);
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implementation
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type
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@ -135,6 +139,12 @@ type
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function GetCurrent: TCustomFontCollectionItem;
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end;
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procedure SetDefaultFreeTypeFontCollection(
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ACollection: TCustomFreeTypeFontCollection);
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begin
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EasyLazFreeType.FontCollection := ACollection;
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end;
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{ TFontCollectionItem }
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function TFontCollectionItem.GetStyles: string;
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@ -245,10 +255,20 @@ begin
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FStyleList := nil;
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FFaceUsage := 0;
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FUsePostscriptStyle:= false;
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FDestroyListeners := nil;
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end;
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procedure TFontCollectionItem.NotifyDestroy;
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var i: integer;
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begin
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for i := 0 to high(FDestroyListeners) do
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FDestroyListeners[i]();
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FDestroyListeners := nil;
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end;
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destructor TFontCollectionItem.Destroy;
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begin
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NotifyDestroy;
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if FFaceUsage <> 0 then
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begin
|
||||
TT_Close_Face(FFace);
|
||||
@ -280,7 +300,7 @@ begin
|
||||
result.Name := Filename;
|
||||
end;
|
||||
|
||||
function TFontCollectionItem.QueryFace: TT_Face;
|
||||
function TFontCollectionItem.QueryFace(AListener: TFontCollectionItemDestroyListener): TT_Face;
|
||||
var errorNum: TT_Error;
|
||||
begin
|
||||
if FFaceUsage = 0 then
|
||||
@ -291,10 +311,24 @@ begin
|
||||
end;
|
||||
result := FFace;
|
||||
inc(FFaceUsage);
|
||||
if Assigned(AListener) then
|
||||
begin
|
||||
setlength(FDestroyListeners,length(FDestroyListeners)+1);
|
||||
FDestroyListeners[high(FDestroyListeners)] := AListener;
|
||||
end;
|
||||
end;
|
||||
|
||||
procedure TFontCollectionItem.ReleaseFace;
|
||||
procedure TFontCollectionItem.ReleaseFace(AListener: TFontCollectionItemDestroyListener);
|
||||
var i,j: integer;
|
||||
begin
|
||||
for i := 0 to high(FDestroyListeners) do
|
||||
if FDestroyListeners[i] = AListener then
|
||||
begin
|
||||
for j := i to high(FDestroyListeners)-1 do
|
||||
FDestroyListeners[j] := FDestroyListeners[j+1];
|
||||
setlength(FDestroyListeners, length(FDestroyListeners)-1);
|
||||
break;
|
||||
end;
|
||||
if FFaceUsage > 0 then
|
||||
begin
|
||||
dec(FFaceUsage);
|
||||
|
||||
@ -375,7 +375,7 @@ uses
|
||||
|
||||
function code_to_index4( charCode : UShort; var cmap4 : TCMap4 ) : UShort;
|
||||
var
|
||||
i, index1, num_segs : Int;
|
||||
i, index1, num_segs, rangeStart : Int;
|
||||
label
|
||||
Found;
|
||||
begin
|
||||
@ -402,8 +402,10 @@ uses
|
||||
code_to_index4 := (charCode + idDelta) and $FFFF
|
||||
else
|
||||
begin
|
||||
index1 := idRangeOffset div 2 + (charCode - startCount) -
|
||||
-(num_segs-i);
|
||||
//the offset in glyphIdArray is given in bytes from the
|
||||
//position after idRangeOffset value itself
|
||||
rangeStart := idRangeOffset div 2 - (num_segs-i);
|
||||
index1 := rangeStart + (charCode - startCount);
|
||||
|
||||
if ( index1 < cmap4.numGlyphId ) and
|
||||
( cmap4.glyphIdArray^[index1] <> 0 ) then
|
||||
|
||||
Loading…
Reference in New Issue
Block a user