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| procedure MakeThumbNail(src, dest: tBitmap); type PRGB24 = ^TRGB24; TRGB24 = packed record B: Byte; G: Byte; R: Byte; end; var x, y, ix, iy: integer; x1, x2, x3: integer;
xscale, yscale: single; iRed, iGrn, iBlu, iRatio: Longword; p, c1, c2, c3, c4, c5: tRGB24; pt, pt1: pRGB24; iSrc, iDst, s1: integer; i, j, r, g, b, tmpY: integer;
RowDest, RowSource, RowSourceStart: integer; w, h: integer; dxmin, dymin: integer; ny1, ny2, ny3: integer; dx, dy: integer; lutX, lutY: array of integer;
begin if src.PixelFormat <> pf24bit then src.PixelFormat := pf24bit; if dest.PixelFormat <> pf24bit then dest.PixelFormat := pf24bit; w := Dest.Width; h := Dest.Height;
if (src.Width <= FThumbSize) and (src.Height <= FThumbSize) then begin dest.Assign(src); exit; end; iDst := (w * 24 + 31) and not 31; iDst := iDst div 8; iSrc := (Src.Width * 24 + 31) and not 31; iSrc := iSrc div 8; xscale := 1 / (w / src.Width); yscale := 1 / (h / src.Height);
SetLength(lutX, w); x1 := 0; x2 := trunc(xscale); for x := 0 to w - 1 do begin lutX[x] := x2 - x1; x1 := x2; x2 := trunc((x + 2) * xscale); end;
SetLength(lutY, h); x1 := 0; x2 := trunc(yscale); for x := 0 to h - 1 do begin lutY[x] := x2 - x1; x1 := x2; x2 := trunc((x + 2) * yscale); end;
dec(w); dec(h); RowDest := integer(Dest.Scanline[0]); RowSourceStart := integer(Src.Scanline[0]); RowSource := RowSourceStart; for y := 0 to h do begin dy := lutY[y]; x1 := 0; x3 := 0; for x := 0 to w do begin dx:= lutX[x]; iRed:= 0; iGrn:= 0; iBlu:= 0; RowSource := RowSourceStart; for iy := 1 to dy do begin pt := PRGB24(RowSource + x1); for ix := 1 to dx do begin iRed := iRed + pt.R; iGrn := iGrn + pt.G; iBlu := iBlu + pt.B; inc(pt); end; RowSource := RowSource - iSrc; end; iRatio := 65535 div (dx * dy); pt1 := PRGB24(RowDest + x3); pt1.R := (iRed * iRatio) shr 16; pt1.G := (iGrn * iRatio) shr 16; pt1.B := (iBlu * iRatio) shr 16; x1 := x1 + 3 * dx; inc(x3,3); end; RowDest := RowDest - iDst; RowSourceStart := RowSource; end;
if dest.Height < 3 then exit;
s1 := integer(dest.ScanLine[0]); iDst := integer(dest.ScanLine[1]) - s1; ny1 := Integer(s1); ny2 := ny1 + iDst; ny3 := ny2 + iDst; for y := 1 to dest.Height - 2 do begin for x := 0 to dest.Width - 3 do begin x1 := x * 3; x2 := x1 + 3; x3 := x1 + 6;
c1 := pRGB24(ny1 + x1)^; c2 := pRGB24(ny1 + x3)^; c3 := pRGB24(ny2 + x2)^; c4 := pRGB24(ny3 + x1)^; c5 := pRGB24(ny3 + x3)^;
r := (c1.R + c2.R + (c3.R * -12) + c4.R + c5.R) div -8; g := (c1.G + c2.G + (c3.G * -12) + c4.G + c5.G) div -8; b := (c1.B + c2.B + (c3.B * -12) + c4.B + c5.B) div -8;
if r < 0 then r := 0 else if r > 255 then r := 255; if g < 0 then g := 0 else if g > 255 then g := 255; if b < 0 then b := 0 else if b > 255 then b := 255;
pt1 := pRGB24(ny2 + x2); pt1.R := r; pt1.G := g; pt1.B := b; end; inc(ny1, iDst); inc(ny2, iDst); inc(ny3, iDst); end; end;
procedure Sharpen(sbm, tbm: TBitmap; alpha: Single); var i, j, k: integer; sr: array[0..2] of PByte; st: array[0..4] of pRGBTriple; tr: PByte; tt, p: pRGBTriple; beta: Single; inta, intb: integer; bmh, bmw: integer; re, gr, bl: integer; BytesPerScanline: integer;
begin Assert((sbm.Width > 2) and (sbm.Height > 2), 'Bitmap must be at least 3x3'); Assert((alpha > 1) and (alpha < 6), 'Alpha must be >1 and <6'); beta := (alpha - 1) / 5; intb := round(beta * $10000); inta := round(alpha * $10000); sbm.PixelFormat := pf24bit; tbm.PixelFormat := pf24bit; tbm.Width := sbm.Width; tbm.Height := sbm.Height; bmw := sbm.Width - 2; bmh := sbm.Height - 2; BytesPerScanline := (((bmw + 2) * 24 + 31) and not 31) div 8;
tr := tbm.Scanline[0]; tt := pRGBTriple(tr);
sr[0] := sbm.Scanline[0]; st[0] := pRGBTriple(sr[0]); for j := 0 to bmw + 1 do begin tt^ := st[0]^; inc(tt); inc(st[0]); end;
sr[1] := PByte(integer(sr[0]) - BytesPerScanline); sr[2] := PByte(integer(sr[1]) - BytesPerScanline); for i := 1 to bmh do begin Dec(tr, BytesPerScanline); tt := pRGBTriple(tr); st[0] := pRGBTriple(integer(sr[0]) + 3); st[1] := pRGBTriple(sr[1]); st[2] := pRGBTriple(integer(sr[1]) + 3); st[3] := pRGBTriple(integer(sr[1]) + 6); st[4] := pRGBTriple(integer(sr[2]) + 3); tt^ := st[1]^; for j := 1 to bmw do begin re := 0; gr := 0; bl := 0; for k := 0 to 4 do begin re := re + st[k]^.rgbtRed; gr := gr + st[k]^.rgbtGreen; bl := bl + st[k]^.rgbtBlue; inc(st[k]); end; re := (intb * re + $7FFF) shr 16; gr := (intb * gr + $7FFF) shr 16; bl := (intb * bl + $7FFF) shr 16;
p := pRGBTriple(st[1]); re := (inta * p^.rgbtRed + $7FFF) shr 16 - re; gr := (inta * p^.rgbtGreen + $7FFF) shr 16 - gr; bl := (inta * p^.rgbtBlue + $7FFF) shr 16 - bl;
inc(tt); if re < 0 then re := 0 else if re > 255 then re := 255; if gr < 0 then gr := 0 else if gr > 255 then gr := 255; if bl < 0 then bl := 0 else if bl > 255 then bl := 255; tt^.rgbtRed := re; tt^.rgbtGreen := gr; tt^.rgbtBlue := bl; end; inc(tt); inc(st[1]); tt^ := st[1]^; sr[0] := sr[1]; sr[1] := sr[2]; Dec(sr[2], BytesPerScanline); end; Dec(tr, BytesPerScanline); tt := pRGBTriple(tr); st[1] := pRGBTriple(sr[1]); for j := 0 to bmw + 1 do begin tt^ := st[1]^; inc(tt); inc(st[1]); end; end; |