OpenEuphoria

Pixel optim

• Posted by Alexander <Carnivals at INAME.COM> Nov 26, 2000
• 401 views

I have managed to put together a graphics library, however, the routines
I'm using are very slow (go figure why :)) Anyway, do anyone know a
optimization for this code?:

global procedure display_emb_vscreen(atom xoffset, atom yoffset, atom
xparent, atom source)
atom cache1, cache2, xvar, yvar, color, readpos

cache1 = peek(source)
cache2 = peek(source+1)
xvar = cache1*256+cache2

cache1 = peek(source+2)
cache2 = peek(source+3)
yvar = cache1*256+cache2

readpos = 4

for y = 1 to yvar do
for x = 1 to xvar do
color = peek(source+readpos)
if color != xparent then
vscreen[y+yoffset][x+xoffset] = color
end if
readpos = readpos + 1
end for
end for
end procedure

xvar and yvar is the size of the picture :) source is the hex address of
where it starts

BTW: Sorry for stealing the idea of a virtual screen :) but this routine is
20% faster than my old