From: Russell Marks (russell.marks@dtn.ntl.com)
Date: Thu 23 Mar 2000 - 15:15:12 IST
> <HTML><HEAD> > <META content="text/html; charset=iso-8859-1" http-equiv=Content-Type> > <META content="MSHTML 5.00.2614.3500" name=GENERATOR> > <STYLE></STYLE> > </HEAD> > <BODY bgColor=#ffffff> > <DIV><FONT face=Arial size=2>Hi,</FONT></DIV> Hi. How about turning off HTML mail before posting to a mailing list? Or, better, just turning it off for good? ;-) > Can anyone suggest the best (fastest/most efficient) way to do a > masked gl_putboxpart operation? There's no inbuilt function for it, so > I assume you'd need to copy the area in question from the larger > bitmap into a separate memory area and then call gl_putboxmask. > > Is this right? An alternative approach is to use a separate 1-pixel-high gl_putboxmask() for each pixel line. This avoids having to copy twice, which may make it faster despite the multiple calls. Here's roughly what I mean (untested): for(i=0;i<src_h;i++) gl_putboxmask(dest_x,dest_y+i,src_w,1, src_pixmap+((src_y+i)*src_pixmap_real_width+src_x)*bytes_per_pixel); Obviously you could optimise this somewhat by keeping a current pointer for the last arg rather than recalculating it each time. -Rus.
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