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Date Posted: 09:16:01 05/15/00 Mon
Author: Hans-Eric Grönlund
Subject: SmoothTransform

Hi,

we discovered that TSmoothTransform (and the other transformations that derives from TConvolutionTransform) is leaving the four corner dots uncopied (in our case they become black although they originally were white).

We traced the problem into TConvolutionTransform.ApplyOnDest and it's CopyBorder procedure. CopyBorder as I understand it is copying a 1 pixel border, leaving it untouched by the transformation (why?). Now the problem is that CopyBorder are missing the four corner dots. I made a small correction that seems to work fine. Here it is:

procedure CopyBorder;
var
X, Y : LongInt;
begin
for Y := 0 to (Height-1) do
begin
if (Y = 0) or (Y = (Height-1)) then
begin
//
//OLD CODE: for X := 1 to (Width-2) do
//
// The old code miss the corner pixels
//
for X := 0 to (Width-1) do
begin
{ draw horizontal borders }
Dest.Rgb[X, 0] := Source.Rgb[X, 0];
Dest.Rgb[X, Height-1] := Source.Rgb[X, Height-1];
end;
end
else
begin
{ draw vertical borders }
Dest.Rgb[0, Y] := Source.Rgb[0, Y];
Dest.Rgb[Width-1, Y] := Source.Rgb[Width-1, Y];
end;
end;
end;

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