paweld/lazarus
1
0
Fork 0
mirror of https://gitlab.com/freepascal.org/lazarus/lazarus.git synced 2025-04-21 22:59:27 +02:00
Code Issues Packages Projects Releases Wiki Activity

SynEdit: TextLayout improved for MacOs, added debug output

Browse Source 
git-svn-id: trunk@19942 -
This commit is contained in:
martin 2009-05-12 13:35:43 +00:00
parent adab0642b9
commit cb1aabd1fe
1 changed files with 75 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

99
components/synedit/syntextdrawer.pp
View File

@ -563,11 +563,19 @@ end;
Procedure TheFontStock.CalcFontAdvance(DC: HDC; FontData: PheFontData;
FontHeight: integer);
Procedure DebugFont(s: String; a: array of const);
begin
if FontData^.Font <> nil then
s := 'Font=' + FontData^.Font.Name + ' Size=' + IntToStr(FontData^.Font.Size) + ' ' + s;
s := 'TheFontStock.CalcFontAdvance: ' + s;
DebugLn(Format(s, a));
end;
procedure GetWHOForChar(s: char; out w, h ,o : Integer; var eto: Boolean);
var
s1, s2, s3: String;
Size1, Size2, Size3: TSize;
w2: Integer;
w2, w3: Integer;
begin
s1 := s;
s2 := s1 + s;
@ -576,7 +584,7 @@ Procedure TheFontStock.CalcFontAdvance(DC: HDC; FontData: PheFontData;
GetTextExtentPoint(DC, PChar(s2), 2, Size2) and
GetTextExtentPoint(DC, PChar(s3), 3, Size3)) then
begin
debugln('SynTextDrawer: Can not us GetTextExtentPoint');
DebugFont('Failed to get GetTextExtentPoint for %s', [s1]);
w := 0;
h := 0;
o := 0;
@ -587,21 +595,50 @@ Procedure TheFontStock.CalcFontAdvance(DC: HDC; FontData: PheFontData;
// Size may contain overhang (italic, bold)
// Size1 contains the size of 1 char + 1 overhang
// Size2 contains the width of 2 chars, with only 1 overhang
// Calculate the Width of 1 char, with NO overhang
w := Size2.cx - Size1.cx;
o := Size1.cx - w;
// And doublecheck it
w2 := Size3.cx - Size2.cx;
if w <> w2 then begin
debugln(['SynTextDrawer: Failed on checking CharWidth with 3 char w=',w, ' w2=',w2]);
w := Max(w, w2);
eto := True;
end;
if o < 0 then begin
debugln('SynTextDrawer: Negative Overhang');
w := Size1.cx;
// Start simple
w := size1.cx;
o := 0;
w2 := Size2.cx - Size1.cx;
w3 := Size3.cx - Size2.cx;
{$IFDEF SYNFONTDEBUG}
DebugFont('Got TextExtends for %s=%d, %s=%d, %s=%d Height=%d', [s1, Size1.cx, s2, Size2.cx, s3, Size3.cx, h]);
{$ENDIF}
if (w2 = w) and (w3 = w) then exit;
if (w2 <= w) and (w3 <= w) then begin
// w includes overhang
if w2 <> w3 then begin
DebugFont('Variable Overhang w=%d w2=%d w3=%d', [w, w2, w3]);
w2 := Max(w2, w3);
end;
o := w - w2;
w := w2;
eto := True;
end
else
if (w2 >= w) or (w3 >= w) then begin
// Width may be fractional, check sanity and keep w
o := 1;
eto := True;
if Max(w2, w3) > w + 1 then begin
DebugFont('Size diff to bi for fractioanl (greater 1) w=%d w2=%d w3=%d', [w, w2, w3]);
// Take a guess/average
w2 := Max(w2, w3);
o := w2 - w;
w := Max(w, (w+w2-1) div 2);
end;
end
else begin
// broken font? one of w2/w3 is smaller, the other wider than w
w := Max(w, (w+w2+w3-1) div 3);
o := w div 2;
eto := True;
end;
{$IFDEF SYNFONTDEBUG}
DebugFont('Final result for %s Width=%d Overhang=%d eto=%s', [s1, w, o, dbgs(eto)]);
{$ENDIF}
end;
procedure AdjustWHOForChar(s: char; var w, h ,o : Integer; var eto: Boolean);
@ -648,7 +685,9 @@ begin
// Negative Overhang ?
if (not ETO) and GetTextExtentPoint(DC, PChar('Ta'), 2, Size1) then
if Size1.cx < 2 * Width then begin
// debugln(['SynTextDrawer: Negative Overhang for "Ta" Width=', Width, ' Overh=',OverHang, ' Ta.cx=',Size1.cx]);
{$IFDEF SYNFONTDEBUG}
DebugFont('Negative Overhang for "Ta" cx=%d Width=%d Overhang=%d', [Size1.cx, Width, OverHang]);
{$ENDIF}
ETO := True;
end;
@ -658,36 +697,40 @@ begin
// DoubleCheck the result with GetTextMetrics
GetTextMetrics(DC, TM);
//GetTextExtentPoint(DC,'ABCgjp',6,Size);
//debugln('TheFontStock.CalcFontAdvance B ',dbgs(pCharHeight),' TM.tmHeight=',dbgs(TM.tmHeight),' TM.tmAscent=',dbgs(TM.tmAscent),' TM.tmDescent=',dbgs(TM.tmDescent),' "',BaseFont.Name,'" ',dbgs(BaseFont.height),' ',dbgs(Size.cx),',',dbgs(Size.cy));
{$IFDEF SYNFONTDEBUG}
DebugFont('TextMetrics tmHeight=%d, tmAve=%d, tmMax=%d, tmOver=%d', [TM.tmHeight, TM.tmAveCharWidth, TM.tmMaxCharWidth, TM.tmOverhang]);
{$ENDIF}
tmw := TM.tmMaxCharWidth + Max(TM.tmOverhang,0);
if Width = 0 then begin
debugln('SynTextDrawer: No Width from GetTextExtentPoint');
DebugFont('No Width from GetTextExtentPoint', []);
Width := tmw;
end
else if (Width > tmw) and (TM.tmMaxCharWidth > 0) then begin
debugln('SynTextDrawer: Width > tmMaxWidth');
DebugFont('Width(%d) > tmMaxWidth+Over(%d)', [Width, tmw]);
// take a guess, this is probably a broken font
Width := Min(Width, round((TM.tmMaxCharWidth + Max(TM.tmOverhang,0)) * 1.2));
ETO := True;
end;
if Height = 0 then begin
debugln('SynTextDrawer: No Height from GetTextExtentPoint');
DebugFont('No Height from GetTextExtentPoint, tmHeight=%d', [TM.tmHeight]);
Height := TM.tmHeight;
end
else if Height < TM.tmHeight then begin
debugln('SynTextDrawer: Height from GetTextExtentPoint to low');
DebugFont('Height from GetTextExtentPoint to low Height=%d, tmHeight=%d', [Height, TM.tmHeight]);
Height := TM.tmHeight;
end;
if Height = 0 then begin
debugln('SynTextDrawer: Fallback on FontHeight');
DebugFont('SynTextDrawer: Fallback on FontHeight', []);
Height := FontHeight;
end;
// If we have a broken font, make sure we return a positive value
if Width <= 0 then Width := 1 + Height * 8 div 10;
if Width <= 0 then begin
DebugFont('SynTextDrawer: Fallback on Width', []);
Width := 1 + Height * 8 div 10;
end;
//if OverHang >0 then debugln(['SynTextDrawer: Overhang=', OverHang]);;
FontData^.CharAdv := Width;
@ -1015,6 +1058,9 @@ procedure TheTextDrawer.SetBaseFont(Value: TFont);
begin
if Assigned(Value) then
begin
{$IFDEF SYNFONTDEBUG}
Debugln(['TheTextDrawer.SetBaseFont Name=', Value.Name, ' Size=', Value.Size, 'Style=', Integer(Value.Style)]);
{$ENDIF}
ReleaseETODist;
with FFontStock do
begin
@ -1041,6 +1087,11 @@ begin
Style := Value;
FBaseCharWidth := Max(FBaseCharWidth, CharAdvance);
FBaseCharHeight := Max(FBaseCharHeight, CharHeight);
{$IFDEF SYNFONTDEBUG}
Debugln(['TheTextDrawer.SetBaseStyle =', Integer(Value),
' CharAdvance=', CharAdvance, ' CharHeight=',CharHeight,
' FBaseCharWidth=', FBaseCharWidth, ' FBaseCharHeight=',FBaseCharHeight]);
{$ENDIF}
end;
end;
end;