Fastest way to draw pixels in FireMonkey
I have made the following code:
procedure TForm15.Button1Click(Sender: TObject);
var
Bitmap1: TBitmap;
im: TImageControl;
Color: TColor;
Scanline: PAlphaColorArray;
x,y,i: Integer;
begin
for i:= 1 to 100 do begin
im:= ImageControl1;
Bitmap1:= TBitmap.Create(100,100);
try
for y:= 0 to 99 do begin
ScanLine:= Bitmap1.ScanLine[y];
for x:= 0 to 99 do begin
ScanLine[x]:= Random(MaxInt);
end;
end;
ImageControl1.Canvas.BeginScene;
ImageControl1.Canvas.DrawBitmap(Bitmap1, RectF(0,0,Bitmap1.Width, Bitmap1.Height)
,im.ParentedRect,1,true);
ImageControl1.Canvas.EndScene;
finally
Bitmap1.Free;
end;
end;
end;
Is there a faster way to draw pixels in Firemonkey?
I aim to make a demo program using Conway's game of life.
All the time is spent performing these two lines of code:
ImageControl1.Canvas.BeginScene;
ImageControl1.Canvas.EndScene;
You can delete all the code that works with the bitmap and the code that actually draws the bitmap and it makes not one iota of difference to the runtime. In other words, the bottleneck is the scene code not the bitmap code. And I see no way for you to optimise that.
My test code looked like this:
Stopwatch := TStopwatch.StartNew;
for i:= 1 to 100 do begin
ImageControl1.Canvas.BeginScene;
ImageControl1.Canvas.EndScene;
end;
ShowMessage(IntToStr(Stopwatch.ElapsedMilliseconds));
This has the same elapsed time as your code, 1600ms on my machine. If you remove the BeginScene , DrawBitmap and EndScene calls then your code runs in 3ms on my machine.
Here is a faster way to do that :
procedure TForm2.Button1Click(Sender: TObject);
var i,j: integer;
begin
for i := 0 to 200 do
for j := 0 to 200 do ImageControl1.Bitmap.ScanLine[i][j]:=Random(Maxlongint);
ImageControl1.Bitmap.BitmapChanged;
end;
Quick and Optimized !...
You can optimize your code like this:
procedure TForm15.Button1Click(Sender: TObject);
var
Bitmap1: TBitmap;
im: TImageControl;
Color: TColor;
ScanLine: PAlphaColorArray;
x,y,i: Integer;
begin
Bitmap1:= TBitmap.Create(100,100);
try
for i:= 1 to 100 do begin
im:= ImageControl1;
Scanline := PAlphaColorArray(Bitmap1.StartLine);
for x := 0 to Bitmap1.Width * Bitmap1.Height do
ScanLine[x] := Random(MaxInt);
ImageControl1.Canvas.BeginScene;
ImageControl1.Canvas.DrawBitmap(Bitmap1, RectF(0,0,Bitmap1.Width, Bitmap1.Height)
,im.ParentedRect,1,true);
ImageControl1.Canvas.EndScene;
end;
finally
Bitmap1.Free;
end;
end;
Removed:
calling try finally in loop
creating TBitmap in loop
calling TBitmap.ScanLine method