Hi list,

Since osdteletext page drawing is rather slow on my C3-600, I investigated the page rendering speed of osdteletext-0.4.2. Average rendering time is 0.74s, dividing down to 0.11s rendering, 0.45s scaling, 0.09s osd drawing and 0.11s screen update. (numbers might be slightly off due to additional debug output)

After a rewrite of the scaler, the scaling is down to 0.1s, speeding up screen update from 0.74s to 0.39s - a noticeable improvement. ;)

The attached patch adds the new scaling code.

Cheers,

Udo

diff -aur osdteletext-0.4.2/txtbitmap.c osdteletext-0.4.2-mod/txtbitmap.c --- osdteletext-0.4.2/txtbitmap.c 2005-03-03 17:51:00.000000000 +0100 +++ osdteletext-0.4.2-mod/txtbitmap.c 2005-03-08 18:45:15.000000000 +0100 @@ -74,6 +74,39 @@ cBitmap *bitmap=new cBitmap(wneu, hneu, depth); Display::SetBitmapPalette(*bitmap);

+#if 1 + // Scale rule: + // xsrc=x0 + xdst*walt/wneu + // ysrc=y0 + ydst*halt/hneu + + int xsrc,xdst,xfrac,ysrc,ydst,yfrac; + // exact src coordinate is floor(xsrc+xfrac/wneu),floor(ysrc+yfrac/hneu) + ysrc=y0; + ydst=0; + yfrac=0; + while (ydst<hneu) { + xsrc=x0; + xdst=0; + xfrac=0; + while (xdst<wneu) { + bitmap->SetIndex(xdst,ydst,*(oldBitmap->Data(xsrc, ysrc)) ); + xdst++; + xfrac+=walt; + while (xfrac>=wneu) { + xfrac-=wneu; + xsrc++; + } + } + ydst++; + yfrac+=halt; + while (yfrac>=hneu) { + yfrac-=hneu; + ysrc++; + } + + } + +#else int/*float*/ oldX=0, oldY=0; for (float x=0;x<wneu;x++) for (float y=0;y<hneu;y++) { @@ -84,6 +117,7 @@ oldY=(int)(((halt*10000/hneu)*y/10000)); bitmap->SetIndex((int)x,(int)y,*(oldBitmap->Data(oldX+x0, oldY+y0)) ); } +#endif return bitmap;

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