On Friday 10 April 2015 19:44:26 misu kun wrote:
> > So the problem is that CPU load goes to 100% if refresh is triggered
> > every 1.6ms?
>
> yes
>
This is normal. There are 625 times per second a read of the pixels from
pixmap handle (most likely video memory), time consuming sine calculations
and a write back of the pixels to video memory.
If I replace pixel access by a pixmap fillrect the CPU load goes down to < 1%
on Linux because it will be handled by the GPU.
"
procedure tmainfo.onpaint(const sender: twidget; const acanvas: tcanvas);
var
col1: colorty;
begin
if ready then begin
if odd(tick) then begin
col1:= cl_black;
end
else begin
col1:= cl_white;
end;
bmp.init(col1);
end;
bmp.paint(acanvas,nullpoint);
end;
"
Graeme, if you read it, above probably affects the fpGUI AggPas canvas too, so
i don't know if it is a good idea to make it the default.
The reading of the pixel memory can be omitted in the example because the
whole image will be written:
"
procedure tmainfo.onpaint(const sender: twidget; const acanvas: tcanvas);
var
x,y: int32;
ima1: imagety;
po1: prgbtriplety;
begin
if ready then begin
allocimage(ima1,bmp.size,bmk_rgb);
po1:= pointer(ima1.pixels);
for y:=0 to bmp.height-1 do begin
for x:=0 to bmp.width-1 do begin
longword(po1^):= round(sin((x/16)+tick*0.005) +
sin((y/16)+tick*0.005))*128 ;
inc(po1);
end;
end;
bmp.loadfromimage(ima1);
freeimage(ima1);
end;
bmp.paint(acanvas,nullpoint);
end;
"
Martin
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