如何在Delphi XE2的TCanvas上替换颜色?以下代码的运行速度非常慢:
for y := ARect.Top to ARect.Top + ARect.Height - 1 do
for x := ARect.Left to ARect.Left + ARect.Width - 1 do
if Canvas.Pixels[x, y] = FixedColor then
Canvas.Pixels[x, y] := Canvas.Pixels[ARect.Left, ARect.Top];
var
aBitmap: TBitmap;
x, y: Integer;
aPixel: PRGBTriple;
...
aBitmap := TBitmap.Create;
try
aBitmap.PixelFormat := pf24bit;
aBitmap.Height := ARect.Height;
aBitmap.Width := ARect.Width;
aBitmap.Canvas.CopyRect(TRect.Create(0, 0, aBitmap.Width, aBitmap.Height), Canvas, ARect);
for y := 0 to aBitmap.Height - 1 do
for x := 0 to aBitmap.Width - 1 do
begin
aPixel := aBitmap.ScanLine[y];
Inc(aPixel, x);
if (aPixel^.rgbtRed = GetRValue(FixedColor)) and (aPixel^.rgbtGreen = GetGValue(FixedColor)) and (aPixel^.rgbtBlue = GetBValue(FixedColor)) then
aPixel^ := PRGBTriple(aBitmap.ScanLine[y])^;
end;
Canvas.Draw(ARect.Left, ARect.Top, aBitmap);
finally
aBitmap.Free;
end;
procedure ReplaceColor(BMP: TBitmap; OldColor, NewColor: TColor);
VAR
x, y: Integer;
R,G,B: Byte;
R_,G_,B_: Byte;
aPixel: PRGBTriple;
begin
R:= GetRValue(OldColor);
G:= GetGValue(OldColor);
B:= GetBValue(OldColor);
R_:= GetRValue(NewColor);
G_:= GetGValue(NewColor);
B_:= GetBValue(NewColor);
BMP.PixelFormat := pf24bit;
for y := 0 to BMP.Height - 1 do
for x := 0 to BMP.Width - 1 do
begin
aPixel := BMP.ScanLine[y];
Inc(aPixel, x);
if (aPixel^.rgbtRed = R)
AND (aPixel^.rgbtGreen = G)
AND (aPixel^.rgbtBlue = B) then
begin
aPixel^.rgbtRed := R_;
aPixel^.rgbtGreen := G_;
aPixel^.rgbtBlue := B_;
end;
end;
end;
procedure ReplaceColor(BMP: TBitmap; OldColor, NewColor: TColor; ToleranceR, ToleranceG, ToleranceB: Byte);
VAR
x, y: Integer;
R,G,B: Byte;
R_,G_,B_: Byte;
aPixel: PRGBTriple;
begin
R:= GetRValue(OldColor);
G:= GetGValue(OldColor);
B:= GetBValue(OldColor);
R_:= GetRValue(NewColor);
G_:= GetGValue(NewColor);
B_:= GetBValue(NewColor);
BMP.PixelFormat := pf24bit;
for y := 0 to BMP.Height - 1 do
for x := 0 to BMP.Width - 1 do
begin
aPixel := BMP.ScanLine[y];
Inc(aPixel, x);
if (abs(aPixel^.rgbtRed - R)< ToleranceR)
AND (abs(aPixel^.rgbtGreen- G)< ToleranceG)
AND (abs(aPixel^.rgbtBlue - B)< ToleranceB) then
begin
aPixel^.rgbtRed := R_;
aPixel^.rgbtGreen := G_;
aPixel^.rgbtBlue := B_;
end;
end;
end;