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|
unit sdltruetypefont;
{
$Id: sdltruetypefont.pas,v 1.1 2004/09/30 22:39:50 savage Exp $
}
{******************************************************************************}
{ }
{ JEDI-SDL : Pascal units for SDL - Simple DirectMedia Layer }
{ Wrapper class for SDL_ttf }
{ }
{ The initial developer of this Pascal code was : }
{ Dominqiue Louis <Dominique@SavageSoftware.com.au> }
{ }
{ Portions created by Dominqiue Louis are }
{ Copyright (C) 2000 - 2001 Dominqiue Louis. }
{ }
{ }
{ Contributor(s) }
{ -------------- }
{ }
{ }
{ Obtained through: }
{ Joint Endeavour of Delphi Innovators ( Project JEDI ) }
{ }
{ You may retrieve the latest version of this file at the Project }
{ JEDI home page, located at http://delphi-jedi.org }
{ }
{ The contents of this file are used with permission, subject to }
{ the Mozilla Public License Version 1.1 (the "License"); you may }
{ not use this file except in compliance with the License. You may }
{ obtain a copy of the License at }
{ http://www.mozilla.org/MPL/MPL-1.1.html }
{ }
{ Software distributed under the License is distributed on an }
{ "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or }
{ implied. See the License for the specific language governing }
{ rights and limitations under the License. }
{ }
{ Description }
{ ----------- }
{ }
{ }
{ }
{ }
{ }
{ }
{ }
{ Requires }
{ -------- }
{ The SDL Runtime libraris on Win32 : SDL.dll on Linux : libSDL.so }
{ They are available from... }
{ http://www.libsdl.org . }
{ }
{ Programming Notes }
{ ----------------- }
{ }
{ }
{ }
{ }
{ Revision History }
{ ---------------- }
{ September 23 2004 - DL : Initial Creation }
{
$Log: sdltruetypefont.pas,v $
Revision 1.1 2004/09/30 22:39:50 savage
Added a true type font class which contains a wrap text function.
Changed the sdl_ttf.pas header to reflect the future of jedi-sdl.
}
{******************************************************************************}
interface
uses
sdl,
sdl_ttf;
type
TRenderType = ( rtLatin1, rtUTF8, rtUnicode );
TSDLFontStyle = ( fsBold, fsItalic, fsUnderline, fsStrikeOut );
TSDLFontStyles = set of TSDLFontStyle;
TTrueTypeFont = class( TObject )
private
FFont : PTTF_Font;
FSolid : Boolean;
FBackGroundColour : TSDL_Color;
FForeGroundColour : TSDL_Color;
FRenderType : TRenderType;
FStyle : TSDLFontStyles;
FFontFile : string;
FFontSize : integer;
procedure PrepareFont;
protected
public
constructor Create( aFontFile : string; aRenderStyle : TSDLFontStyles = [ ]; aFontSize : integer = 14 );
destructor Destroy; override;
function DrawText( aText : WideString ) : PSDL_Surface; overload;
function DrawText( aText : WideString; aWidth, aHeight : Integer ) : PSDL_Surface; overload;
property BackGroundColour : TSDL_Color read FBackGroundColour write FBackGroundColour;
property ForeGroundColour : TSDL_Color read FForeGroundColour write FForeGroundColour;
property FontFile : string read FFontFile write FFontFile;
property RenderType : TRenderType read FRenderType write FRenderType;
property Solid : Boolean read FSolid write FSolid;
property Style : TSDLFontStyles read FStyle write FStyle;
property FontSize : integer read FFontSize write FFontSize;
end;
implementation
uses
SysUtils;
{ TTrueTypeFont }
constructor TTrueTypeFont.Create( aFontFile : string; aRenderStyle : TSDLFontStyles; aFontSize : integer );
begin
inherited Create;
if FileExists( aFontFile ) then
begin
FStyle := aRenderStyle;
FFontSize := aFontSize;
FSolid := false;
FBackGroundColour.r := 255;
FBackGroundColour.g := 255;
FBackGroundColour.b := 255;
FForeGroundColour.r := 0;
FForeGroundColour.g := 0;
FForeGroundColour.b := 0;
FRenderType := rtUTF8;
if ( TTF_Init >= 0 ) then
begin
FFontFile := aFontFile;
end
else
raise Exception.Create( 'Failed to Initialiase SDL_TTF' );
end
else
raise Exception.Create( 'Font File does not exist' );
end;
destructor TTrueTypeFont.Destroy;
begin
if FFont <> nil then
TTF_CloseFont( FFont );
TTF_Quit;
inherited;
end;
function TTrueTypeFont.DrawText( aText : WideString ) : PSDL_Surface;
begin
PrepareFont;
result := nil;
case FRenderType of
rtLatin1 :
begin
if ( FSolid ) then
begin
result := TTF_RenderText_Solid( FFont, PChar( string( aText ) ), FForeGroundColour );
end
else
begin
result := TTF_RenderText_Shaded( FFont, PChar( string( aText ) ), FForeGroundColour, FBackGroundColour );
end;
end;
rtUTF8 :
begin
if ( FSolid ) then
begin
result := TTF_RenderUTF8_Solid( FFont, PChar( string( aText ) ), FForeGroundColour );
end
else
begin
result := TTF_RenderUTF8_Shaded( FFont, PChar( string( aText ) ), FForeGroundColour, FBackGroundColour );
end;
end;
rtUnicode :
begin
if ( FSolid ) then
begin
result := TTF_RenderUNICODE_Solid( FFont, PUInt16( aText ), FForeGroundColour );
end
else
begin
result := TTF_RenderUNICODE_Shaded( FFont, PUInt16( aText ), FForeGroundColour, FBackGroundColour );
end;
end;
end;
end;
function TTrueTypeFont.DrawText( aText : WideString; aWidth, aHeight : Integer ) : PSDL_Surface;
var
textw, texth, i, yPos : integer;
strChopped : WideString;
SurfaceList : array of PSDL_Surface;
strlist : array of WideString;
ReturnedSurface : PSDL_Surface;
BltRect : TSDL_Rect;
begin
PrepareFont;
// Do an initial check to see if it already fits
case FRenderType of
rtLatin1 :
begin
if TTF_SizeText( FFont, PChar( string( aText ) ), textw, texth ) = 0 then
begin
if ( textw < aWidth )
and ( texth < aHeight ) then
begin
result := DrawText( aText );
exit;
end
end;
end;
rtUTF8 :
begin
if TTF_SizeUTF8( FFont, PChar( string( aText ) ), textw, texth ) = 0 then
begin
if ( textw < aWidth )
and ( texth < aHeight ) then
begin
result := DrawText( aText );
exit;
end
end;
end;
rtUnicode :
begin
if TTF_SizeUNICODE( FFont, PUInt16( aText ), textw, texth ) = 0 then
begin
if ( textw < aWidth )
and ( texth < aHeight ) then
begin
result := DrawText( aText );
exit;
end
end;
end;
end;
// Create the Surface we will be returning
ReturnedSurface := SDL_DisplayFormat( SDL_CreateRGBSurface( SDL_SRCCOLORKEY or SDL_RLEACCEL or SDL_HWACCEL, aWidth, aHeight, 16, 0, 0, 0, 0 ) );
// If we are still here there is some serious parsing to do
case FRenderType of
rtLatin1 :
begin
strChopped := aText;
i := Length( strChopped );
while ( i <> 0 ) do
begin
if ( string( strChopped[ i ] ) <> ' ' ) and ( Integer( string( strChopped[ i ] ) ) <> 13 ) then
dec( i )
else
begin
dec( i );
strChopped := Copy( strChopped, 0, i );
if TTF_SizeText( FFont, PChar( string( strChopped ) ), textw, texth ) = 0 then
begin
if ( textw < aWidth )
and ( texth < aHeight ) then
begin
SetLength( strlist, Length( strlist ) + 1 );
strlist[ Length( strlist ) - 1 ] := strChopped;
strChopped := Copy( aText, i + 2, Length( aText ) - ( i - 1 ) );
i := Length( strChopped );
if TTF_SizeText( FFont, PChar( string( strChopped ) ), textw, texth ) = 0 then
begin
SetLength( strlist, Length( strlist ) + 1 );
strlist[ Length( strlist ) - 1 ] := strChopped;
break;
end;
end;
end;
end;
end;
SetLength( SurfaceList, Length( strlist ) );
for i := Low( strlist ) to High( strlist ) do
begin
if ( FSolid ) then
begin
SurfaceList[ i ] := TTF_RenderText_Solid( FFont, PChar( string( strlist[ i ] ) ), FForeGroundColour );
end
else
begin
SurfaceList[ i ] := TTF_RenderText_Shaded( FFont, PChar( string( strlist[ i ] ) ), FForeGroundColour, FBackGroundColour );
end;
end;
end;
rtUTF8 :
begin
strChopped := aText;
i := Length( strChopped );
while ( i <> 0 ) do
begin
if ( string( strChopped[ i ] ) <> ' ' ) and ( Integer( string( strChopped[ i ] ) ) <> 13 ) then
dec( i )
else
begin
dec( i );
strChopped := Copy( strChopped, 0, i );
if TTF_SizeUTF8( FFont, PChar( string( strChopped ) ), textw, texth ) = 0 then
begin
if ( textw < aWidth )
and ( texth < aHeight ) then
begin
SetLength( strlist, Length( strlist ) + 1 );
strlist[ Length( strlist ) - 1 ] := strChopped;
strChopped := Copy( aText, i + 2, Length( aText ) - ( i - 1 ) );
i := Length( strChopped );
if TTF_SizeUTF8( FFont, PChar( string( strChopped ) ), textw, texth ) = 0 then
begin
SetLength( strlist, Length( strlist ) + 1 );
strlist[ Length( strlist ) - 1 ] := strChopped;
break;
end;
end;
end;
end;
end;
SetLength( SurfaceList, Length( strlist ) );
for i := Low( strlist ) to High( strlist ) do
begin
if ( FSolid ) then
begin
SurfaceList[ i ] := TTF_RenderUTF8_Solid( FFont, PChar( string( strlist[ i ] ) ), FForeGroundColour );
end
else
begin
SurfaceList[ i ] := TTF_RenderUTF8_Shaded( FFont, PChar( string( strlist[ i ] ) ), FForeGroundColour, FBackGroundColour );
end;
end;
end;
rtUnicode :
begin
strChopped := aText;
i := Length( strChopped );
while ( i <> 0 ) do
begin
if ( string( strChopped[ i ] ) <> ' ' ) and ( Integer( string( strChopped[ i ] ) ) <> 13 ) then
dec( i )
else
begin
dec( i );
strChopped := Copy( strChopped, 0, i );
if TTF_SizeUNICODE( FFont, PUInt16( strChopped ), textw, texth ) = 0 then
begin
if ( textw < aWidth )
and ( texth < aHeight ) then
begin
SetLength( strlist, Length( strlist ) + 1 );
strlist[ Length( strlist ) - 1 ] := strChopped;
strChopped := Copy( aText, i + 2, Length( aText ) - ( i - 1 ) );
i := Length( strChopped );
if TTF_SizeUNICODE( FFont, PUInt16( strChopped ), textw, texth ) = 0 then
begin
SetLength( strlist, Length( strlist ) + 1 );
strlist[ Length( strlist ) - 1 ] := strChopped;
break;
end;
end;
end;
end;
end;
SetLength( SurfaceList, Length( strlist ) );
for i := Low( strlist ) to High( strlist ) do
begin
if ( FSolid ) then
begin
SurfaceList[ i ] := TTF_RenderUNICODE_Solid( FFont, PUInt16( strlist[ i ] ), FForeGroundColour );
end
else
begin
SurfaceList[ i ] := TTF_RenderUNICODE_Shaded( FFont, PUInt16( strlist[ i ] ), FForeGroundColour, FBackGroundColour );
end;
end;
end;
end;
// Now Draw the SurfaceList onto the resulting Surface
yPos := 6;
for i := Low( SurfaceList ) to High( SurfaceList ) do
begin
BltRect.x := 6;
BltRect.y := yPos;
BltRect.w := SurfaceList[ i ].w;
BltRect.h := SurfaceList[ i ].h;
SDL_BlitSurface( SurfaceList[ i ], nil, ReturnedSurface, @BltRect );
yPos := yPos + TTF_FontHeight( FFont );
end;
result := ReturnedSurface;
for i := Low( SurfaceList ) to High( SurfaceList ) do
begin
SDL_FreeSurface( SurfaceList[ i ] );
end;
SetLength( SurfaceList, 0 );
SetLength( strlist, 0 );
end;
procedure TTrueTypeFont.PrepareFont;
var
renderstyle : integer;
begin
if FFont <> nil then
TTF_CloseFont( FFont );
FFont := TTF_OpenFont( PChar( FFontFile ), FFontSize );
renderstyle := TTF_STYLE_NORMAL;
if ( fsBold in FStyle ) then
renderstyle := renderstyle or TTF_STYLE_BOLD;
if ( fsItalic in FStyle ) then
renderstyle := renderstyle or TTF_STYLE_ITALIC;
if ( fsUnderline in FStyle ) then
renderstyle := renderstyle or TTF_STYLE_UNDERLINE;
TTF_SetFontStyle( FFont, renderstyle );
end;
end.
|
