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Merge branch 'patch-scaling-flip-fix' into 'next'

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Fixes for patch scaling and V_FLIP usage

The following issues are fixed by this branch:
* a patch using both scaling and V_FLIP does not appear in the "correct" place on the screen. Thanks to LJSonic for pointing this out to me on 'fun
* Scaled and/or V_FLIPed patches wrap at the left/right screen edges even though they're not supposed to. V_FLIP patches at these edges may also crop the wrong side of the patch if they're at the right edge.

See merge request !60
This commit is contained in:
Inuyasha 2016-03-31 20:21:51 -04:00
commit 042331edd5
1 changed files with 29 additions and 7 deletions
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36
src/v_video.c
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@ -336,6 +336,8 @@ void V_DrawFixedPatch(fixed_t x, fixed_t y, fixed_t pscale, INT32 scrn, patch_t
const column_t *column; const column_t *column;
UINT8 *desttop, *dest, *deststart, *destend; UINT8 *desttop, *dest, *deststart, *destend;
const UINT8 *source, *deststop; const UINT8 *source, *deststop;
fixed_t pwidth; // patch width
fixed_t offx = 0; // x offset
if (rendermode == render_none) if (rendermode == render_none)
return; return;
@ -476,16 +478,36 @@ void V_DrawFixedPatch(fixed_t x, fixed_t y, fixed_t pscale, INT32 scrn, patch_t
} }
} }
deststart = desttop; if (pscale != FRACUNIT) // scale width properly
destend = desttop + SHORT(patch->width) * dupx; {
pwidth = SHORT(patch->width)<<FRACBITS;
pwidth = FixedMul(pwidth, pscale);
pwidth = FixedMul(pwidth, dupx<<FRACBITS);
pwidth >>= FRACBITS;
}
else
pwidth = SHORT(patch->width) * dupx;
for (col = 0; (col>>FRACBITS) < SHORT(patch->width); col += colfrac, ++x, desttop++) deststart = desttop;
destend = desttop + pwidth;
for (col = 0; (col>>FRACBITS) < SHORT(patch->width); col += colfrac, ++offx, desttop++)
{ {
INT32 topdelta, prevdelta = -1; INT32 topdelta, prevdelta = -1;
if (x < 0) // don't draw off the left of the screen (WRAP PREVENTION) if (flip) // offx is measured from right edge instead of left
continue; {
if (x >= vid.width) // don't draw off the right of the screen (WRAP PREVENTION) if (x+pwidth-offx < 0) // don't draw off the left of the screen (WRAP PREVENTION)
break; break;
if (x+pwidth-offx >= vid.width) // don't draw off the right of the screen (WRAP PREVENTION)
continue;
}
else
{
if (x+offx < 0) // don't draw off the left of the screen (WRAP PREVENTION)
continue;
if (x+offx >= vid.width) // don't draw off the right of the screen (WRAP PREVENTION)
break;
}
column = (const column_t *)((const UINT8 *)(patch) + LONG(patch->columnofs[col>>FRACBITS])); column = (const column_t *)((const UINT8 *)(patch) + LONG(patch->columnofs[col>>FRACBITS]));
while (column->topdelta != 0xff) while (column->topdelta != 0xff)