Graphics32-Frage!!

[bingo72]

Delphi-Quellcode:

function BuildMappingTable(
  DstLo, DstHi: Integer;
  ClipLo, ClipHi: Integer;
  SrcLo, SrcHi: Integer;
  Kernel: TCustomKernel): TMappingTable;
var
  SrcW, DstW, ClipW: Integer;
  Filter: TFilterMethod;
  FilterWidth: TFloat;
  Scale, OldScale: TFloat;
  Center: TFloat;
  Count: Integer;
  Left, Right: Integer;
  I, J, K: Integer;
  Weight: Integer;
begin
  SrcW := SrcHi - SrcLo;
  DstW := DstHi - DstLo;
  ClipW := ClipHi - ClipLo;
  if SrcW = 0 then
  begin
    Result := nil;
    Exit;
  end
  else if SrcW = 1 then
  begin
    SetLength(Result, ClipW);
    for I := 0 to ClipW - 1 do
    begin
      SetLength(Result[I], 1);
      Result[I][0].Pos := 0;
      Result[I][0].Weight := 256;
    end;
    Exit;
  end;
  SetLength(Result, ClipW);
  if ClipW = 0 then Exit;

  if FullEdge then Scale := DstW / SrcW
  else Scale := (DstW - 1) / (SrcW - 1);

  Filter := Kernel.Filter;
  FilterWidth := Kernel.GetWidth;
  K := 0;

  if Scale = 0 then
  begin
    Assert(Length(Result) = 1);
    SetLength(Result[0], 1);
    Result[0][0].Pos := (SrcLo + SrcHi) div 2;
    Result[0][0].Weight := 256;
  end
  else if Scale < 1 then
  begin
    OldScale := Scale;
    Scale := 1 / Scale;
    FilterWidth := FilterWidth * Scale;
    for I := 0 to ClipW - 1 do
    begin
      if FullEdge then
        Center := SrcLo - 0.5 + (I - DstLo + ClipLo + 0.5) * Scale
      else
        Center := SrcLo + (I - DstLo + ClipLo) * Scale;
      Left := Floor(Center - FilterWidth);
      Right := Ceil(Center + FilterWidth);
      Count := -256;
      for J := Left to Right do
      begin
        Weight := Round(256 * Filter((Center - J) * OldScale) * OldScale);
        if Weight <> 0 then
        begin
          Inc(Count, Weight);
          K := Length(Result[I]);
          SetLength(Result[I], K + 1);
          Result[I][K].Pos := [b]Constrain(J, SrcLo, SrcHi - 1);[/b]     --> hier stellt es ihn auf!!     
          Result[I][K].Weight := Weight;
        end;
      end;
     [...]

[edit=SirThornberry]Delphi-Tags gesetzt - Mfg, SirThornberry[/edit]