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{
This file is part of the Free Pascal run time library.
Copyright (c) 2003 by the Free Pascal development team
TFPPalette 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.
**********************************************************************}
{ TFPPalette }
constructor TFPPalette.create (ACount : integer);
begin
inherited create;
if aCount > 0 then
getmem (FData, sizeof(TFPColor)*ACount)
else
FData := nil;
FCapacity := ACount;
SetCount (0);
end;
destructor TFPPalette.destroy;
begin
if FCapacity > 0 then
freemem (FData);
inherited;
end;
procedure TFPPalette.Build (Img : TFPCustomImage);
var x,y : integer;
begin
if (Img.Palette <> self) then
begin
Count := 0;
for x := 0 to img.width-1 do
for y := 0 to img.height-1 do
IndexOf(img[x,y]);
end;
end;
procedure TFPPalette.Copy(APalette: TFPPalette);
var
x: integer;
begin
if (APalette <> Self) then
begin
Self.Clear;
for x := 0 to APalette.Count - 1 do
Add(APalette.Color[x])
end;
end;
procedure TFPPalette.Merge (pal : TFPPalette);
var r : integer;
begin
for r := 0 to pal.count-1 do
IndexOf (pal[r]);
end;
procedure TFPPalette.CheckIndex (index:integer);
begin
if (index >= FCount) or (index < 0) then
FPImgError (StrInvalidIndex,[ErrorText[StrPalette],index]);
end;
function TFPPalette.Add (const Value:TFPColor) : integer;
begin
result := FCount;
inc (FCount);
if FCount > FCapacity then
EnlargeData;
FData^[result] := Value;
end;
procedure TFPPalette.SetColor (index:integer; const Value:TFPColor);
begin
if index = FCount then
Add (Value)
else
begin
CheckIndex (index);
FData^[index] := Value;
end;
end;
function TFPPalette.GetColor (index:integer) : TFPColor;
begin
CheckIndex (index);
result := FData^[index];
end;
function TFPPalette.GetCount : integer;
begin
result := FCount;
end;
procedure TFPPalette.EnlargeData;
var old : integer;
NewData : PFPColorArray;
begin
old := FCapacity;
if FCapacity <= 16 then
FCapacity := 32
else if FCapacity <= 128 then
FCapacity := 256
else
// MG: changed to exponential growth
inc (FCapacity, FCapacity);
GetMem (NewData, sizeof(TFPColor)*FCapacity);
if old > 0 then
begin
move (FData^[0], NewData^[0], sizeof(TFPColor)*FCount);
FreeMem (FData);
end;
FData := NewData;
end;
procedure TFPPalette.SetCount (Value:integer);
var
O : integer;
begin
if Value <> FCount then
begin
if Value > FCapacity then
begin
FCapacity := Value+8;
Reallocmem(FData,sizeof(TFPColor)*FCapacity);
end;
for o := FCount to Value-1 do
FData^[o] := colBlack;
FCount := Value;
end;
end;
procedure TFPPalette.SetCapacity (ind : Integer);
var o : Integer;
begin
if ind<count then ind:=count;
if ind<>fcapacity then
begin
fcapacity:=ind;
Reallocmem(FData,sizeof(TFPColor)*FCapacity);
end;
if ind>count then
begin
for o := FCount to ind-1 do
FData^[o] := colBlack;
end;
end;
function TFPPalette.IndexOf (const AColor:TFPColor) : integer;
begin
result := FCount;
repeat
dec (result);
until (result < 0) or (FData^[result]=AColor);
if result < 0 then
result := Add (AColor);
end;
procedure TFPPalette.Clear;
begin
SetCount (0);
end;
{ Functions to create standard palettes, by Giulio Bernardi 2005 }
{ A simple 1 bit black and white palette }
function CreateBlackAndWhitePalette : TFPPalette;
var fppal : TFPPalette;
Col : TFPColor;
begin
fppal:=TFPPalette.Create(2);
Col.Alpha:=AlphaOpaque;
Col.Red:=$FFFF; Col.Green:=$FFFF; Col.Blue:=$FFFF;
fppal.Color[0]:=Col;
Col.Red:=$0000; Col.Green:=$0000; Col.Blue:=$0000;
fppal.Color[1]:=Col;
Result:=fppal;
end;
{ The "standard" netscape 216-color palette (aka: web safe palette) }
function CreateWebSafePalette : TFPPalette;
var Col : TFPColor;
i : integer;
fppal : TFPPalette;
begin
fppal:=TFPPalette.Create(216);
Col.Alpha:=AlphaOpaque;
i:=0;
Col.Red:=$FFFF;
while true do
begin
Col.Green:=$FFFF;
while true do
begin
Col.Blue:=$FFFF;
while true do
begin
fppal.Color[i]:=Col;
if Col.Blue=0 then break;
dec(Col.Blue,$3333);
end;
if Col.Green=0 then break;
dec(Col.Green,$3333);
end;
if Col.Red=0 then break;
dec(Col.Red,$3333);
end;
Result:=fppal;
end;
{ A grayscale palette. Not very useful. }
function CreateGrayScalePalette : TFPPalette;
var Col : TFPColor;
i : integer;
fppal : TFPPalette;
begin
fppal:=TFPPalette.Create(256);
Col.Alpha:=AlphaOpaque;
for i:=0 to $FF do
begin
Col.Red:=i;
Col.Red:=(Col.Red shl 8) + Col.Red;
Col.Green:=Col.Red;
Col.Blue:=Col.Red;
fppal.Color[i]:=Col;
end;
Result:=fppal;
end;
{ Standard VGA 16 color palette. }
function CreateVGAPalette : TFPPalette;
var fppal : TFPPalette;
begin
fppal:=TFPPalette.Create(16);
fppal.Color[0]:=colBlack;
fppal.Color[1]:=colNavy;
fppal.Color[2]:=colBlue;
fppal.Color[3]:=colMaroon;
fppal.Color[4]:=colPurple;
fppal.Color[5]:=colDkGreen;
fppal.Color[6]:=colRed;
fppal.Color[7]:=colTeal;
fppal.Color[8]:=colFuchsia;
fppal.Color[9]:=colOlive;
fppal.Color[10]:=colGray;
fppal.Color[11]:=colLime;
fppal.Color[12]:=colAqua;
fppal.Color[13]:=colSilver;
fppal.Color[14]:=colYellow;
fppal.Color[15]:=colWhite;
Result:=fppal;
end;
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