Delphi的算法,原理一样.
procedure TfcCustomImageForm.ApplyBitmapRegion;
begin
SetWindowRgn(GetParentForm(self).Handle, 0, False);
if FRegion <> 0 then DeleteObject(FRegion); FRegion := fcCreateRegionFromBitmap(Picture.Bitmap, GetTransparentColor);
if not (csDesigning in ComponentState) then
SetWindowRgn(GetParentForm(self).Handle, FRegion, True);
end;
function fcCreateRegionFromBitmap(ABitmap: TBitmap; TransColor: TColor): HRgn;
var
TempBitmap: TBitmap;
Rgn1, Rgn2: HRgn;
Col, StartCol, Row: integer;
Line: PByteArray; function ColToColor(Col: integer): TColor;
begin
if fcIsTrueColorBitmap(TempBitmap) then
result:= Line[Col * 3] * 256 * 256 + Line[Col * 3 + 1] * 256 + Line[Col * 3 + 2]
else result := TColor(fcThisThat((Line[Col div 8] and BitMask[Col mod 8]) <> 0, clBlack, clWhite));
end;
begin
result := 0;
if (ABitmap <> nil) and (ABitmap.Width = 0) or (ABitmap.Height = 0) then Exit;
Rgn1 := 0; TempBitmap := TBitmap.Create; TempBitmap.Assign(ABitmap);
if not fcIsTrueColorBitmap(TempBitmap) then
begin
TempBitmap.Mask(TransColor);
TransColor := clBlack;
end; with TempBitmap do
begin
for Row := 0 to TempBitmap.height-1 do
begin
Line:= scanLine[row]; Col := 0;
while Col < TempBitmap.Width do
begin
while (Col < TempBitmap.Width) and (ColToColor(Col) = TransColor) do inc(Col);
if Col >= TempBitmap.Width then Continue; StartCol := Col;
while (Col < TempBitmap.Width) and (ColToColor(Col) <> TransColor) do inc(Col);
if Col >= TempBitmap.Width then Col := TempBitmap.Width; if Rgn1 = 0 then Rgn1 := CreateRectRgn(StartCol, Row, Col, Row + 1)
else begin
Rgn2 := CreateRectRgn(StartCol, Row, Col, Row + 1);
if (Rgn2 <> 0) then CombineRgn(Rgn1,Rgn1,Rgn2,RGN_OR);
Deleteobject(Rgn2);
end;
end;
end;
end;
result := Rgn1;
TempBitmap.Free;
end;
procedure TfcCustomImageForm.ApplyBitmapRegion;
begin
SetWindowRgn(GetParentForm(self).Handle, 0, False);
if FRegion <> 0 then DeleteObject(FRegion); FRegion := fcCreateRegionFromBitmap(Picture.Bitmap, GetTransparentColor);
if not (csDesigning in ComponentState) then
SetWindowRgn(GetParentForm(self).Handle, FRegion, True);
end;
function fcCreateRegionFromBitmap(ABitmap: TBitmap; TransColor: TColor): HRgn;
var
TempBitmap: TBitmap;
Rgn1, Rgn2: HRgn;
Col, StartCol, Row: integer;
Line: PByteArray; function ColToColor(Col: integer): TColor;
begin
if fcIsTrueColorBitmap(TempBitmap) then
result:= Line[Col * 3] * 256 * 256 + Line[Col * 3 + 1] * 256 + Line[Col * 3 + 2]
else result := TColor(fcThisThat((Line[Col div 8] and BitMask[Col mod 8]) <> 0, clBlack, clWhite));
end;
begin
result := 0;
if (ABitmap <> nil) and (ABitmap.Width = 0) or (ABitmap.Height = 0) then Exit;
Rgn1 := 0; TempBitmap := TBitmap.Create; TempBitmap.Assign(ABitmap);
if not fcIsTrueColorBitmap(TempBitmap) then
begin
TempBitmap.Mask(TransColor);
TransColor := clBlack;
end; with TempBitmap do
begin
for Row := 0 to TempBitmap.height-1 do
begin
Line:= scanLine[row]; Col := 0;
while Col < TempBitmap.Width do
begin
while (Col < TempBitmap.Width) and (ColToColor(Col) = TransColor) do inc(Col);
if Col >= TempBitmap.Width then Continue; StartCol := Col;
while (Col < TempBitmap.Width) and (ColToColor(Col) <> TransColor) do inc(Col);
if Col >= TempBitmap.Width then Col := TempBitmap.Width; if Rgn1 = 0 then Rgn1 := CreateRectRgn(StartCol, Row, Col, Row + 1)
else begin
Rgn2 := CreateRectRgn(StartCol, Row, Col, Row + 1);
if (Rgn2 <> 0) then CombineRgn(Rgn1,Rgn1,Rgn2,RGN_OR);
Deleteobject(Rgn2);
end;
end;
end;
end;
result := Rgn1;
TempBitmap.Free;
end;
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