UNIT Unit6_imgfuncs;
INTERFACE
USES Math, Unit3_data;

TYPE
  TImgPackage=RECORD
    imgx,imgy:Word;
    imgdepth:Byte;
    storetype:Byte;
    datasize:LongWord;
    raw_addr:LongWord;
    imgdata:Tdata;
  END;
FUNCTION ResizeImage(oldx,oldy:LongWord; imgdepth:Byte; data:Tdata):Tdata;
FUNCTION RevertImage(imgx,imgy,imgdepth:LongWord; imgdata:Tdata):Tdata;
FUNCTION DecompressImage(imgx,imgy:LongWord; imgdata:Tdata):Tdata;
FUNCTION ImgdataToBmp(imgx,imgy,imgdepth,storetype:LongWord; imgdata:Tdata):Tdata;
FUNCTION LoadImgData(fileid:LongWord):TImgPackage;

IMPLEMENTATION
USES Unit2_functions;


FUNCTION ResizeImage(oldx,oldy:LongWord; imgdepth:Byte; data:Tdata):Tdata;
  VAR
    i,j:LongWord;
    col,row,row_orig:LongWord;
    temparray:Tdata;
  BEGIN
    SetLength(temparray,(oldx DIV 2)*(oldy DIV 2)*(imgdepth DIV 8));
    row_orig:=0;
    row:=0;
    col:=0;
    FOR i:=0 TO (oldx*oldy)-1 DO BEGIN
      IF ((i MOD oldx)=0) AND (i>0) THEN BEGIN
        Inc(row_orig);
        IF (row_orig MOD 2)=0 THEN BEGIN
          Inc(row);
          col:=0;
        END;
      END;
      IF (row_orig MOD 2)=0 THEN BEGIN
        IF (i MOD 2)=0 THEN BEGIN
          FOR j:=0 TO (imgdepth DIV 8)-1 DO
            temparray[((row*(oldx DIV 2))+col)*(imgdepth DIV 8)+j]:=data[i*2+j];
          Inc(col);
        END;
      END;
    END;
    Result:=temparray;
  END;


FUNCTION RevertImage(imgx,imgy,imgdepth:LongWord; imgdata:Tdata):Tdata;
  VAR
    x,y,i:LongWord;
  BEGIN
    SetLength(Result,imgx*imgy*(imgdepth DIV 8));
    FOR y:=0 TO imgy-1 DO
      FOR x:=0 TO imgx-1 DO
        FOR i:=0 TO (imgdepth DIV 8)-1 DO
          Result[((imgx*(imgy-1-y)+x)*(imgdepth DIV 8))+i]:=
                  imgdata[(imgx*y+x)*(imgdepth DIV 8)+i];
  END;


FUNCTION DecompressImage(imgx,imgy:LongWord; imgdata:Tdata):Tdata;
  TYPE
    Tcolor=RECORD
        RGBb:Byte;
        RGBg:Byte;
        RGBr:Byte;
        RGBa:Byte;
      END;
  VAR
    i,j,x,y:LongWord;
    color:Array[1..4] OF Tcolor;
    pixel:Array[1..16] OF Byte;
  BEGIN
    x:=0;
    y:=0;
    SetLength(Result,imgx*imgy*4);
    FOR i:=0 TO ((imgx*imgy) DIV 16)-1 DO BEGIN
      Color[1].RGBb:=Floor(((imgdata[(i*8)+0]+imgdata[(i*8)+1]*256) AND $001F) / $001F * 255);
      Color[1].RGBg:=Floor(((imgdata[(i*8)+0]+imgdata[(i*8)+1]*256) AND $07E0) / $07E0 * 255);
      Color[1].RGBr:=Floor(((imgdata[(i*8)+0]+imgdata[(i*8)+1]*256) AND $F800) / $F800 * 255);
      Color[1].RGBa:=255;
      Color[2].RGBb:=Floor(((imgdata[(i*8)+2]+imgdata[(i*8)+3]*256) AND $001F) / $001F * 255);
      Color[2].RGBg:=Floor(((imgdata[(i*8)+2]+imgdata[(i*8)+3]*256) AND $07E0) / $07E0 * 255);
      Color[2].RGBr:=Floor(((imgdata[(i*8)+2]+imgdata[(i*8)+3]*256) AND $F800) / $F800 * 255);
      Color[2].RGBa:=255;
      Color[3].RGBb:=Floor( Color[1].RGBb/3*2 + Color[2].RGBb/3 );
      Color[3].RGBg:=Floor( Color[1].RGBg/3*2 + Color[2].RGBg/3 );
      Color[3].RGBr:=Floor( Color[1].RGBr/3*2 + Color[2].RGBr/3 );
      Color[3].RGBa:=255;
      Color[4].RGBb:=Floor( Color[1].RGBb/3 + Color[2].RGBb/3*2 );
      Color[4].RGBg:=Floor( Color[1].RGBg/3 + Color[2].RGBg/3*2 );
      Color[4].RGBr:=Floor( Color[1].RGBr/3 + Color[2].RGBr/3*2 );
      Color[4].RGBa:=255;
      Pixel[1]:=Floor( (imgdata[(i*8)+4] AND $C0) / $40 + 1 );
      Pixel[2]:=Floor( (imgdata[(i*8)+4] AND $30) / $10 + 1 );
      Pixel[3]:=Floor( (imgdata[(i*8)+4] AND $0C) / $04 + 1 );
      Pixel[4]:=Floor( (imgdata[(i*8)+4] AND $03) + 1 );
      Pixel[5]:=Floor( (imgdata[(i*8)+5] AND $C0) / $40 + 1 );
      Pixel[6]:=Floor( (imgdata[(i*8)+5] AND $30) / $10 + 1 );
      Pixel[7]:=Floor( (imgdata[(i*8)+5] AND $0C) / $04 + 1 );
      Pixel[8]:=Floor( (imgdata[(i*8)+5] AND $03) + 1 );
      Pixel[9]:=Floor( (imgdata[(i*8)+6] AND $C0) / $40 + 1 );
      Pixel[10]:=Floor( (imgdata[(i*8)+6] AND $30) / $10 + 1 );
      Pixel[11]:=Floor( (imgdata[(i*8)+6] AND $0C) / $04 + 1 );
      Pixel[12]:=Floor( (imgdata[(i*8)+6] AND $03) + 1 );
      Pixel[13]:=Floor( (imgdata[(i*8)+7] AND $C0) / $40 + 1 );
      Pixel[14]:=Floor( (imgdata[(i*8)+7] AND $30) / $10 + 1 );
      Pixel[15]:=Floor( (imgdata[(i*8)+7] AND $0C) / $04 + 1 );
      Pixel[16]:=Floor( (imgdata[(i*8)+7] AND $03) + 1 );
      FOR j:=0 TO 3 DO BEGIN
        Result[((y+3)*imgx+x+j)*3+0]:=Color[Pixel[16-j]].RGBb;
        Result[((y+3)*imgx+x+j)*3+1]:=Color[Pixel[16-j]].RGBg;
        Result[((y+3)*imgx+x+j)*3+2]:=Color[Pixel[16-j]].RGBr;
      END;
      FOR j:=0 TO 3 DO BEGIN
        Result[((y+2)*imgx+x+j)*3+0]:=Color[Pixel[12-j]].RGBb;
        Result[((y+2)*imgx+x+j)*3+1]:=Color[Pixel[12-j]].RGBg;
        Result[((y+2)*imgx+x+j)*3+2]:=Color[Pixel[12-j]].RGBr;
      END;
      FOR j:=0 TO 3 DO BEGIN
        Result[((y+1)*imgx+x+j)*3+0]:=Color[Pixel[8-j]].RGBb;
        Result[((y+1)*imgx+x+j)*3+1]:=Color[Pixel[8-j]].RGBg;
        Result[((y+1)*imgx+x+j)*3+2]:=Color[Pixel[8-j]].RGBr;
      END;
      FOR j:=0 TO 3 DO BEGIN
        Result[((y+0)*imgx+x+j)*3+0]:=Color[Pixel[4-j]].RGBb;
        Result[((y+0)*imgx+x+j)*3+1]:=Color[Pixel[4-j]].RGBg;
        Result[((y+0)*imgx+x+j)*3+2]:=Color[Pixel[4-j]].RGBr;
      END;
      x:=x+4;
      IF x=imgx THEN BEGIN
        y:=y+4;
        x:=0;
      END;
    END;
  END;


FUNCTION ImgdataToBmp(imgx,imgy,imgdepth,storetype:LongWord; imgdata:Tdata):Tdata;
  CONST BMPheader:Array[0..53] OF Byte=
          ($42,$4D,0,0,0,0,0,0,0,0,54,0,0,0,
           40,0,0,0,0,0,0,0,0,0,0,0,1,0,$18,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0);
  VAR
    i,x,y:LongWord;
  BEGIN
    CASE storetype OF
      0: BEGIN
          SetLength(Result,imgx*imgy*3);
          FOR y:=0 TO imgy-1 DO BEGIN
            FOR x:=0 TO imgx-1 DO BEGIN
              Result[((imgx*y+x)*3)+0]:=Floor( ( (imgdata[(imgx*y+x)*2]+imgdata[(imgx*y+x)*2+1]*256) AND $000F ) / $000F * 255);
              Result[((imgx*y+x)*3)+1]:=Floor( ( (imgdata[(imgx*y+x)*2]+imgdata[(imgx*y+x)*2+1]*256) AND $00F0 ) / $00F0 * 255);
              Result[((imgx*y+x)*3)+2]:=Floor( ( (imgdata[(imgx*y+x)*2]+imgdata[(imgx*y+x)*2+1]*256) AND $0F00 ) / $0F00 * 255);
            END;
          END;
        END;
      1,2,8: BEGIN
          SetLength(Result,imgx*imgy*3);
          FOR y:=0 TO imgy-1 DO BEGIN
            FOR x:=0 TO imgx-1 DO BEGIN
              Result[((imgx*y+x)*3)+0]:=Floor( ( (imgdata[(imgx*y+x)*2]+imgdata[(imgx*y+x)*2+1]*256) AND $001F ) / $001F * 255);
              Result[((imgx*y+x)*3)+1]:=Floor( ( (imgdata[(imgx*y+x)*2]+imgdata[(imgx*y+x)*2+1]*256) AND $03E0 ) / $03E0 * 255);
              Result[((imgx*y+x)*3)+2]:=Floor( ( (imgdata[(imgx*y+x)*2]+imgdata[(imgx*y+x)*2+1]*256) AND $7C00 ) / $7C00 * 255);
            END;
          END;
        END;
      9: BEGIN
          Result:=DecompressImage(imgx,imgy,imgdata);
        END;
    END;
    Result:=RevertImage(imgx,imgy,24,Result);
    SetLength(Result,imgx*imgy*3+54);
    FOR i:=High(Result)-54 DOWNTO 0 DO   Result[i+54]:=Result[i];

    FOR i:=0 TO High(BMPheader) DO   Result[i]:=BMPheader[i];
    Result[2]:=((imgx*imgy*3+54) AND $000000FF);
    Result[3]:=((imgx*imgy*3+54) AND $0000FF00) DIV $100;
    Result[4]:=((imgx*imgy*3+54) AND $00FF0000) DIV $10000;
    Result[5]:=((imgx*imgy*3+54) AND $FF000000) DIV $1000000;
    Result[18]:=(imgx AND $000000FF) DIV $1;
    Result[19]:=(imgx AND $0000FF00) DIV $100;
    Result[20]:=(imgx AND $00FF0000) DIV $10000;
    Result[21]:=(imgx AND $FF000000) DIV $1000000;
    Result[22]:=(imgy AND $000000FF) DIV $1;
    Result[23]:=(imgy AND $0000FF00) DIV $100;
    Result[24]:=(imgy AND $00FF0000) DIV $10000;
    Result[25]:=(imgy AND $FF000000) DIV $1000000;
    Result[34]:=((imgx*imgy*3) AND $000000FF) DIV $1;
    Result[35]:=((imgx*imgy*3) AND $0000FF00) DIV $100;
    Result[36]:=((imgx*imgy*3) AND $00FF0000) DIV $10000;
    Result[37]:=((imgx*imgy*3) AND $FF000000) DIV $1000000;
  END;

FUNCTION LoadImgData(fileid:LongWord):TImgPackage;
{  VAR
    raw_addr:LongWord;
    storetype:Byte;
    imgx,imgy:Word;
    imgdepth:Byte;
    data:Tdata;
    datasize:LongWord;}
  BEGIN
      LoadDatFilePart(fileid,$9C,SizeOf(Result.raw_addr),@Result.raw_addr);
      LoadDatFilePart(fileid,$8C,SizeOf(Result.imgx),@Result.imgx);
      LoadDatFilePart(fileid,$8E,SizeOf(Result.imgy),@Result.imgy);
      LoadDatFilePart(fileid,$90,SizeOf(Result.storetype),@Result.storetype);

      CASE Result.storetype OF
        0,1,2: BEGIN
            Result.datasize:=Result.imgx*Result.imgy*2;
            Result.imgdepth:=16;
          END;
        8: BEGIN
            Result.datasize:=Result.imgx*Result.imgy*4;
            Result.imgdepth:=32;
          END;
        9: BEGIN
            Result.datasize:=Result.imgx*Result.imgy DIV 2;
            Result.imgdepth:=16;
          END;
      ELSE
        Exit;
      END;
      SetLength(Result.imgdata,Result.datasize);

      LoadRawFilePart(Result.raw_addr,Result.datasize,@Result.imgdata[0]);
  END;

END.