I have made a lua improvement tha changes time from 126ms to 46ms
local bw = bitmap:Width()
local bh = bitmap:Height()
local R = bitmap.r
local G = bitmap.g
local B = bitmap.b
for j=0,bitmap:Height()-1 do
local offset = j*bw
for i=0,bw-1 do
R[offset +i ] = 255
G[offset +i ] = 0
B[offset +i ] = 0
end
end
the important part is local R = bitmap.r
Hope you get a good holiday ;-)
victor bombi
----- Original Message -----
From: Antonio Scuri
To: IUP discussion list.
Sent: Friday, January 24, 2014 8:56 PM
Subject: Re: [Iup-users] drawing pixel per pixel
No, there isn't.
But we could implement something similar in IM. But only when I get back from
vacation in mid Feb.
Best,
Scuri
On Fri, Jan 24, 2014 at 5:22 PM, Victor Bombi <[email protected]> wrote:
Hello,
I am trying to use CD and IM from lua for drawing pixel per pixel.
I have tried 3 mechanisms for "clearing" the canvas with a red color
1- IM as image[0][i][j] = 255 (313 ms)
2- CD canvas with canvas:Pixel (200 ms)
3- CD with cdBitmap image.r[j*w+i] = 255 (164 ms)
The best would be third mechanism but it is still to slow for me.
In processing, for example I can use
loadPixels();
for(...){
pixels[x+y*width] = color;
}
updatePixels();
and is extremely fast
Is there another way to do it?
Best
victor bombi
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