unit PalUtils;

interface

uses
  LCLType, LCLIntf, SysUtils, Classes, Graphics,
  RGBHSVUtils, RGBHSLUtils, RGBCIEUtils, RGBCMYKUtils,
  HTMLColors;

const
  clCustom = $2FFFFFFF;
  clTransparent = $3FFFFFFF;

type
  TSortOrder = (soAscending, soDescending);
  TSortMode = (smRed, smGreen, smBlue, smHue, smSaturation, smLuminance, smValue, smNone, smCyan, smMagenta, smYellow, smBlacK, smCIEx, smCIEy, smCIEz, smCIEl, smCIEa, smCIEb);

  AcoColors = record
    Colors: array of TColor;
    Names: array of WideString;
    HasNames: boolean;
  end;

//replaces passed strings with passed value
function ReplaceFlags(s: string; flags: array of string; value: integer): string;

//replaces the appropriate tags with values in a hint format string
function FormatHint(fmt: string; c: TColor): string;

//converts a string value to TColor including clCustom and clTransparent
function mbStringToColor(s: string): TColor;

//converts a TColor to a string value including clCustom and clTransparent
function mbColorToString(c: TColor): string;

//blends two colors together in proportion C1 : C2 = W1 : 100 - W1, where 0 <= W1 <= 100
function Blend(C1, C2: TColor; W1: Integer): TColor;

// Inverts a color
function InvertedColor(C: TColor): TColor;

//generates a white-color-black or a black-color-white gradient palette
function MakePalette(BaseColor: TColor; SortOrder: TSortOrder): string;

//generates a gradient palette from the given colors
function MakeGradientPalette(Colors: array of TColor): string;

//sorts colors in a string list
procedure SortPalColors(Colors: TStrings; SortMode: TSortMode; SortOrder: TSortOrder);

//reads JASC .pal file
function ReadJASCPal(PalFile: TFileName): string;

//saves a string list to a JASC .pal file
procedure SaveJASCPal(pal: TStrings; FileName: TFileName);
(*
//reads Photoshop .aco file into an Aco record
function ReadPhotoshopAco(PalFile: TFileName): AcoColors;

//reads Photoshop .act file
function ReadPhotoshopAct(PalFile: TFileName): string;
  *)

implementation

uses
  Math;

function ReplaceFlags(s: string; flags: array of string; value: integer): string;
var
  i, p: integer;
  v: string;
begin
  Result := s;
  v := IntToStr(value);
  for i := 0 to Length(flags) - 1 do
  begin
    p := Pos(flags[i], Result);
    if p > 0 then
    begin
      Delete(Result, p, Length(flags[i]));
      Insert(v, Result, p);
    end;
  end;
end;

function AnsiReplaceText(const AText, AFromText, AToText: string): string;
begin
  Result := StringReplace(AText, AFromText, AToText, [rfReplaceAll, rfIgnoreCase]);
end;

function FormatHint(fmt: string; c: TColor): string;
var
  h: string;
begin
  h := AnsiReplaceText(fmt, '%hex', '#' + ColorToHex(c));
  h := AnsiReplaceText(h, '%cieL', IntToStr(Round(GetCIElValue(c))));
  h := AnsiReplaceText(h, '%cieA', IntToStr(Round(GetCIEaValue(c))));
  h := AnsiReplaceText(h, '%cieB', IntToStr(Round(GetCIEbValue(c))));
  h := AnsiReplaceText(h, '%cieX', IntToStr(Round(GetCIExValue(c))));
  h := AnsiReplaceText(h, '%cieY', IntToStr(Round(GetCIEyValue(c))));
  h := AnsiReplaceText(h, '%cieZ', IntToStr(Round(GetCIEzValue(c))));
  h := AnsiReplaceText(h, '%cieC', IntToStr(Round(GetCIEcValue(c))));
  h := AnsiReplaceText(h, '%cieH', IntToStr(Round(GetCIEhValue(c))));
  h := AnsiReplaceText(h, '%hslH', IntToStr(RGBHSLUtils.GetHValue(c)));
  h := AnsiReplaceText(h, '%hslS', IntToStr(RGBHSLUtils.GetSValue(c)));
  h := AnsiReplaceText(h, '%hslL', IntToStr(RGBHSLUtils.GetLValue(c)));
  h := AnsiReplaceText(h, '%hsvH', IntToStr(RGBHSVUtils.GetHValue(c)));
  h := AnsiReplaceText(h, '%hsvS', IntToStr(RGBHSVUtils.GetSValue(c)));
  h := AnsiReplaceText(h, '%hsvV', IntToStr(RGBHSVUtils.GetVValue(c)));
  h := AnsiReplaceText(h, '%r', IntToStr(GetRValue(c)));
  h := AnsiReplaceText(h, '%g', IntToStr(GetGValue(c)));
  h := AnsiReplaceText(h, '%b', IntToStr(GetBValue(c)));
  h := AnsiReplaceText(h, '%c', IntToStr(GetCValue(c)));
  h := AnsiReplaceText(h, '%m', IntToStr(GetMValue(c)));
  h := AnsiReplaceText(h, '%y', IntToStr(GetYValue(c)));
  h := AnsiReplaceText(h, '%k', IntToStr(GetKValue(c)));
  h := AnsiReplaceText(h, '%h', IntToStr(RGBHSLUtils.GetHValue(c)));
  h := AnsiReplaceText(h, '%s', IntToStr(RGBHSLUtils.GetSValue(c)));
  h := AnsiReplaceText(h, '%l', IntToStr(RGBHSLUtils.GetLValue(c)));
  h := AnsiReplaceText(h, '%v', IntToStr(RGBHSVUtils.GetVValue(c)));
  Result := h;
end;

function mbStringToColor(s: string): TColor;
begin
  //remove spaces
  s := AnsiReplaceText(s, ' ', '');
  if SameText(s, 'clCustom') then
    Result := clCustom
  else
  if SameText(s, 'clTransparent') then
    Result := clTransparent
  else
    Result := StringToColor(s);
end;

function mbColorToString(c: TColor): string;
begin
  if c = clCustom then
    Result := 'clCustom'
  else
  if c = clTransparent then
    Result := 'clTransparent'
  else
    Result := ColorToString(c);
end;

//taken from TBXUtils, TBX Package © Alex Denisov (www.g32.org)
function Blend(C1, C2: TColor; W1: Integer): TColor;
var
  W2, A1, A2, D, F, G: Integer;
begin
  if C1 < 0 then C1 := GetSysColor(C1 and $FF);
  if C2 < 0 then C2 := GetSysColor(C2 and $FF);

  if W1 >= 100 then D := 1000
  else D := 100;

  W2 := D - W1;
  F := D div 2;

  A2 := C2 shr 16 * W2;
  A1 := C1 shr 16 * W1;
  G := (A1 + A2 + F) div D and $FF;
  Result := G shl 16;

  A2 := (C2 shr 8 and $FF) * W2;
  A1 := (C1 shr 8 and $FF) * W1;
  G := (A1 + A2 + F) div D and $FF;
  Result := Result or G shl 8;

  A2 := (C2 and $FF) * W2;
  A1 := (C1 and $FF) * W1;
  G := (A1 + A2 + F) div D and $FF;
  Result := Result or G;
end;

function InvertedColor(C: TColor): TColor;
begin
  Result := RgbToColor(255 - GetRValue(c), 255 - GetGValue(c), 255 - GetBValue(c));
end;

function IsMember(sl: TStrings; s: string): boolean;
var
  i: integer;
begin
  for i := 0 to sl.count -1 do
    if sl.Strings[i] = s then
    begin
      Result := true;
      exit;
    end;
  Result := false;
end;

function MakePalette(BaseColor: TColor; SortOrder: TSortOrder): string;
var
  i: integer;
  s: TStrings;
begin
  Result := '';
  s := TStringList.Create;
  try
    case SortOrder of
      soAscending:
        for i := 239 downto 0 do
          s.Add(ColorToString(HSLRangeToRGB(GetHValue(BaseColor), GetSValue(BaseColor), 240 - i)));
      soDescending:
        for i := 0 to 239 do
          s.Add(ColorToString(HSLRangeToRGB(GetHValue(BaseColor), GetSValue(BaseColor), 240 - i)));
    end;
    Result := s.Text;
  finally
    s.Free;
  end;
end;

function MakeGradientPalette(Colors: array of TColor): string;
type
  RGBArray = array[0..2] of Byte;
var
  i, j, k, Span: Integer;
  s: TStringList;
  Scolor: string;
  Faktor: double;
  a: RGBArray;
  b: array of RGBArray;
begin
  Result := '';
  Span := 300;
  s := TStringList.Create;
  try
    SetLength(b, High(Colors) + 1);
    for i := 0 to High(Colors) do
    begin
      Colors[i] := ColorToRGB(Colors[i]);
      b[i, 0] := GetRValue(Colors[i]);
      b[i, 1] := GetGValue(Colors[i]);
      b[i, 2] := GetBValue(Colors[i]);
    end;
    for i := 0 to High(Colors) - 1 do
      for j := 0 to Span do
      begin
        Faktor := j / Span;
        for k := 0 to 3 do
          a[k] := Trunc(b[i, k] + ((b[i + 1, k] - b[i, k]) * Faktor));
        Scolor := ColorToString(RGB(a[0], a[1], a[2]));
        if not IsMember(s, Scolor) then
          s.add(Scolor);
      end;
    Result := s.Text;
  finally
    s.Free;
  end;
end;

procedure SortPalColors(Colors: TStrings; SortMode: TSortMode; SortOrder: TSortOrder);

  function MaxPos(s: TStrings; sm: TSortMode): integer;
  var
    i: integer;
    first: TColor;
  begin
    Result := 0;
    first := clBlack;
    for i := 0 to s.Count - 1 do
      case sm of
        smRed:
          if GetRValue(first) < GetRValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smGreen:
          if GetGValue(first) < GetGValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smBlue:
          if GetBValue(first) < GetBValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smHue:
          if GetHValue(first) < GetHValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smSaturation:
          if GetSValue(first) < GetSValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smLuminance:
          if GetLValue(first) < GetLValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smValue:
          if GetVValue(first) < GetVValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smCyan:
          if GetCValue(first) < GetCValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smMagenta:
          if GetMValue(first) < GetMValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smYellow:
          if GetYValue(first) < GetYValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smBlacK:
          if GetKValue(first) < GetKValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smCIEx:
          if GetCIEXValue(first) < GetCIEXValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smCIEy:
          if GetCIEYValue(first) < GetCIEYValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smCIEz:
          if GetCIEZValue(first) < GetCIEZValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smCIEl:
          if GetCIELValue(first) < GetCIELValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smCIEa:
          if GetCIEAValue(first) < GetCIEAValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smCIEb:
          if GetCIEBValue(first) < GetCIEBValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
      end;
  end;

  function MinPos(s: TStrings; sm: TSortMode): integer;
  var
    i: integer;
    first: TColor;
  begin
    Result := 0;
    first := clWhite;
    for i := 0 to s.Count - 1 do
      case sm of
        smRed:
          if GetRValue(first) > GetRValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smGreen:
          if GetGValue(first) > GetGValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smBlue:
          if GetBValue(first) > GetBValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smHue:
          if GetHValue(first) > GetHValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smSaturation:
          if GetSValue(first) > GetSValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smLuminance:
          if GetLValue(first) > GetLValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smValue:
          if GetVValue(first) > GetVValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smCyan:
          if GetCValue(first) > GetCValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smMagenta:
          if GetMValue(first) > GetMValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smYellow:
          if GetYValue(first) > GetYValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smBlacK:
          if GetKValue(first) > GetKValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smCIEx:
          if GetCIEXValue(first) > GetCIEXValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smCIEy:
          if GetCIEYValue(first) > GetCIEYValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smCIEz:
          if GetCIEZValue(first) > GetCIEZValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smCIEl:
          if GetCIELValue(first) > GetCIELValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smCIEa:
          if GetCIEAValue(first) > GetCIEAValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
        smCIEb:
          if GetCIEBValue(first) > GetCIEBValue(mbStringToColor(s.Strings[i])) then
          begin
            first := mbStringToColor(s.Strings[i]);
            Result := i;
          end;
      end;
  end;

var
  i, m: integer;
  s: TStrings;
begin
  if SortMode <> smNone then
  begin
    if Colors.Count = 0 then Exit;
    m := 0;
    s := TStringList.Create;
    try
      s.AddStrings(Colors);
      Colors.Clear;
      for i := s.Count - 1 downto 0 do
      begin
        case SortOrder of
          soAscending  : m := MinPos(s, SortMode);
          soDescending : m := MaxPos(s, SortMode);
        end;
        Colors.Add(s.Strings[m]);
        s.Delete(m);
      end;
    finally
      s.Free;
    end;
  end;
end;

function ReadJASCPal(PalFile: TFileName): string;
var
  p, t, c: TStrings;
  i: integer;
begin
  if not FileExists(PalFile) then
    raise Exception.Create('File not found');

  p := TStringList.Create;
  t := TStringList.Create;
  c := TStringList.Create;
  try
    p.LoadFromFile(PalFile);
    for i := 0 to p.Count - 1 do
      if p.strings[i] <> '' then
      begin
        t.Clear;
        ExtractStrings([' '], [], PChar(p.strings[i]), t);
        if t.Count = 3 then
          c.Add(ColorToString(RGB(StrToInt(t.strings[0]), StrToInt(t.strings[1]), StrToInt(t.strings[2]))));
      end;
    Result := c.Text;
  finally
    c.Free;
    t.Free;
    p.Free;
  end;
end;

procedure SaveJASCPal(pal: TStrings; FileName: TFileName);
var
  i: integer;
  p: TStringList;
  c: TColor;
begin
  if not FileExists(FileName) then
    raise Exception.Create('File not found');

  p := TStringList.Create;
  try
    p.Add('JASC-PAL');
    p.Add('0100');
    p.Add('256');
    for i := 0 to pal.Count - 1 do
      if (pal.Strings[i] <> '') and not SameText(pal.Strings[i], 'clCustom') and not SameText(pal.Strings[i], 'clTransparent') then
      begin
        c := StringToColor(pal.Strings[i]);
        p.Add(IntToStr(GetRValue(c)) + ' ' + IntToStr(GetGValue(c)) + ' ' + IntToStr(GetBValue(c)));
      end;
    p.SaveToFile(FileName);
  finally
    p.Free;
  end;
end;

procedure ExchangeBytes(var w: Word);
begin
  Swap(w);
{
asm
 MOV DX,[w] //assign the word to the data register
 XCHG DL,DH // exchange low and high data values
 MOV [w],DX //assign the register data to the word
 }
end;

procedure ExchangeChars(var s: WideString);
var
  i: Integer;
  w: Word;
begin
  for i := 1 to Length(s) do
  begin
    w := Word(s[i]);
    ExchangeBytes(w);
    s[i] := WideChar(w);
  end;
end;
                (*
function GetAcoColor(space,w,x,y,z: word): TColor;
begin
  case space of
    0: //RGB
      Result := RGB(w div 256, x div 256, y div 256);
    1: //HSB - HSV
      Result := HSVToColor(Round(w/182.04), Round(x/655.35), Round(y/655.35));
    2: //CMYK
      Result := CMYKToColor(Round(100-w/55.35), Round(100-x/655.35), Round(100-y/655.35), Round(100-z/655.35));
    7: //Lab
      Result := LabToRGB(w/100, x/100, y/100);
    8: //Grayscale
      Result := RGB(Round(w/39.0625), Round(w/39.0625), Round(w/39.0625));
    9: //Wide CMYK
      Result := CMYKToColor(w div 100, x div 100, y div 100, z div 100)
    else //unknown
     Result := RGB(w div 256, x div 256, y div 256);
  end;
end;

function ReadPhotoshopAco(PalFile: TFileName): AcoColors;
var
  f: file;
  ver, num, space, w, x, y, z, dummy: Word;
  i: integer;
  v0Length: byte;
  v0Name: string;
  v2Length: Word;
  v2Name: WideString;
begin
  if not FileExists(PalFile) then
  begin
    SetLength(Result.Colors, 0);
    SetLength(Result.Names, 0);
    Result.HasNames := false;
    raise Exception.Create('File not found');
  end;

  AssignFile(f, PalFile);
  Reset(f, 1);
  //read version
  BlockRead(f, ver, sizeof(ver));
  ExchangeBytes(ver);
  if not (ver in [0, 1, 2]) then
  begin
    CloseFile(f);
    raise Exception.Create('The file you are trying to load is not (yet) supported.'#13'Please submit the file for testing to MXS so loading of this version will be supported too');
  end;

  //read number of colors
  BlockRead(f, num, sizeof(num));
  ExchangeBytes(num);
  //read names
  if (ver = 0) or (ver = 2) then
  begin
    SetLength(Result.Names, num);
    Result.HasNames := true;
  end
  else
  begin
    SetLength(Result.Names, 0);
    Result.HasNames := false;
  end;
  //read colors
  SetLength(Result.Colors, num);
  for i := 0 to num - 1 do
  begin
    BlockRead(f, space, sizeof(space));
    ExchangeBytes(space);
    BlockRead(f, w, sizeof(w));
    ExchangeBytes(w);
    BlockRead(f, x, sizeof(x));
    ExchangeBytes(x);
    BlockRead(f, y, sizeof(y));
    ExchangeBytes(y);
    BlockRead(f, z, sizeof(z));
    ExchangeBytes(z);
    Result.Colors[i] := GetAcoColor(space, w, x, y, z);
    case ver of
      0: begin
           BlockRead(f, v0Length, SizeOf(v0Length));
           SetLength(v0Name, v0Length);
           if v0Length > 0 then
             BlockRead(f, PChar(v0Name)^, v0Length);
           Result.Names[i] := v0Name;
         end;
      2: begin
           BlockRead(f, dummy, sizeof(dummy));
           BlockRead(f, v2Length, SizeOf(v2Length));
           ExchangeBytes(v2Length);
           SetLength(v2Name, v2Length - 1);
           if v2Length > 0 then
           begin
             BlockRead(f, PWideChar(v2Name)^, 2*(v2Length - 1));
             ExchangeChars(v2Name);
           end;
           Result.Names[i] := v2Name;
           BlockRead(f, dummy, sizeof(dummy));
         end;
    end;
  end;
  CloseFile(f);
end;

function ReadPhotoshopAct(PalFile: TFileName): string;
var
  f: file;
  r, g, b: byte;
  s: TStringList;
  i: integer;
begin
  if not FileExists(PalFile) then
    raise Exception.Create('File not found');

  s := TStringList.Create;
  try
    AssignFile(f, PalFile);
    Reset(f, 1);
    for i := 0 to 255 do
    begin
      BlockRead(f, r, sizeof(r));
      BlockRead(f, g, sizeof(g));
      BlockRead(f, b, sizeof(b));
      s.Add(ColorToString(RGB(r, g, b)));
    end;
    Result := s.Text;
  finally
    s.Free;
  end;
  CloseFile(f);
end;
                        *)
end.