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{
This file is part of the Free Pascal run time library.
Copyright (c) 2003 by the Free Pascal development team
XPM writer implementation.
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
{$mode objfpc}{$h+}
unit FPWriteXPM;
interface
uses FPImage, classes, sysutils;
type
TFPWriterXPM = class (TFPCustomImageWriter)
private
FPalChars : string;
FColorFormat : string;
FColorShift : word;
FColorSize : byte;
procedure SetColorSize (AValue : byte);
function ColorToHex (c:TFPColor) : string;
protected
procedure InternalWrite (Str:TStream; Img:TFPCustomImage); override;
public
constructor Create; override;
property PalChars : string read FPalChars write FPalChars;
property ColorCharSize : byte read FColorSize write SetColorSize;
// number of characters to use for 1 colorcomponent
end;
implementation
const
DefPalChars = '.,-*abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789@#;:=+%$()[]';
constructor TFPWriterXPM.create;
begin
inherited create;
PalChars := DefPalChars;
FColorSize := 4;
end;
procedure TFPWriterXPM.SetColorSize (AValue : byte);
begin
if AValue > 3 then
FColorSize := 4
else if AValue = 0 then
FColorSize := 1
else
FColorSize := AValue;
end;
function TFPWriterXPM.ColorToHex (c:TFPColor) : string;
var r,g,b : word;
begin
with c do
begin
r := red shr FColorShift;
g := green shr FColorShift;
b := blue shr FColorShift;
end;
result := format(FColorFormat,[r,g,b]);
end;
procedure TFPWriterXPM.InternalWrite (Str:TStream; Img:TFPCustomImage);
var p, l : TStringList;
c, len, r, t : integer;
TmpPalette, Palette: TFPPalette;
procedure BuildPaletteStrings;
var r,c,e : integer;
procedure MakeCodes (const head:string; charplace:integer);
var r : integer;
begin
r := 1;
dec (charplace);
while (r <= e) and (c >= 0) do
begin
if Charplace > 0 then
MakeCodes (head+PalChars[r],charplace)
else begin
p.Add (head+PalChars[r]);
dec(c);
end;
inc (r);
end;
end;
begin
// Calculate length of codes
len := 1;
e := length(PalChars);
r := e;
c := Palette.count;
while (r <= c) do
begin
inc (len);
r := r * e;
end;
MakeCodes ('',len);
end;
procedure InitConsts;
var fmt : string;
begin
fmt := inttostr(FColorSize);
fmt := '%'+fmt+'.'+fmt+'x';
FColorFormat := fmt+fmt+fmt;
case FColorSize of
1 : FColorShift := 12;
2 : FColorShift := 8;
3 : FColorShift := 4;
else FColorShift := 0;
end;
end;
var s : string;
begin
l := TStringList.Create;
p := TStringList.Create;
TmpPalette := nil;
try
l.Add ('/* XPM */');
l.Add ('static char *graphic[] = {');
Palette := img.palette;
if not Assigned(Palette) then begin
TmpPalette := TFPPalette.Create(0);
TmpPalette.Build(Img);
Palette := TmpPalette;
end;
c := Palette.count;
BuildPaletteStrings;
l.add (format('"%d %d %d %d",',[img.width,img.height,c,len]));
InitConsts;
for r := 0 to c-1 do
begin
if Palette[r] <> colTransparent then
l.Add (format('"%s c #%s",',[p[r],ColorToHex(Palette.color[r])]))
else
l.Add (format('"%s c None",',[p[r]]));
end;
for r := 0 to img.Height-1 do
begin
s := '';
for t := 0 to img.Width-1 do
if Assigned(TmpPalette) then
s := s + p[TmpPalette.IndexOf(img.Colors[t,r])]
else
s := s + p[img.pixels[t,r]];
s := '"'+s+'"';
if r < img.Height-1 then
s := s + ',';
l.Add (s);
end;
l.Add ('};');
finally
TmpPalette.Free;
l.SaveToStream (Str);
p.Free;
l.Free;
end;
end;
initialization
ImageHandlers.RegisterImageWriter ('XPM Format', 'xpm', TFPWriterXPM);
end.
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