Ejemplo n.º 1
0
void
fbRasterizeTrapezoid (PicturePtr    pPicture,
		      xTrapezoid  *trap,
		      int	    x_off,
		      int	    y_off)
{
    FbBits	*buf;
    int		bpp;
    int		width;
    int		stride;
    int		height;
    int		pxoff, pyoff;

    xFixed	x_off_fixed;
    xFixed	y_off_fixed;
    RenderEdge	l, r;
    xFixed	t, b;
    
    if (!xTrapezoidValid (trap))
	return;

    fbGetDrawable (pPicture->pDrawable, buf, stride, bpp, pxoff, pyoff);

    width = pPicture->pDrawable->width;
    height = pPicture->pDrawable->height;
    x_off += pxoff;
    y_off += pyoff;
    
    x_off_fixed = IntToxFixed(x_off);
    y_off_fixed = IntToxFixed(y_off);
    t = trap->top + y_off_fixed;
    if (t < 0)
	t = 0;
    t = RenderSampleCeilY (t, bpp);

    b = trap->bottom + y_off_fixed;
    if (xFixedToInt (b) >= height)
	b = IntToxFixed (height) - 1;
    b = RenderSampleFloorY (b, bpp);
    
    if (b >= t)
    {
	/* initialize edge walkers */
	RenderLineFixedEdgeInit (&l, bpp, t, &trap->left, x_off, y_off);
	RenderLineFixedEdgeInit (&r, bpp, t, &trap->right, x_off, y_off);
	
	fbRasterizeEdges (buf, bpp, width, stride, &l, &r, t, b);
    }
}
Ejemplo n.º 2
0
void
fbAddTraps (PicturePtr	pPicture,
	    INT16	x_off,
	    INT16	y_off,
	    int		ntrap,
	    xTrap	*traps)
{
    FbBits	*buf;
    int		bpp;
    int		width;
    int		stride;
    int		height;
    int		pxoff, pyoff;

    xFixed	x_off_fixed;
    xFixed	y_off_fixed;
    RenderEdge  l, r;
    xFixed	t, b;

    fbGetDrawable (pPicture->pDrawable, buf, stride, bpp, pxoff, pyoff);

    width = pPicture->pDrawable->width;
    height = pPicture->pDrawable->height;
    x_off += pxoff;
    y_off += pyoff;

    x_off_fixed = IntToxFixed(y_off);
    y_off_fixed = IntToxFixed(y_off);

    while (ntrap--)
    {
	t = traps->top.y + y_off_fixed;
	if (t < 0)
	    t = 0;
	t = RenderSampleCeilY (t, bpp);

	b = traps->bot.y + y_off_fixed;
	if (xFixedToInt (b) >= height)
	    b = IntToxFixed (height) - 1;
	b = RenderSampleFloorY (b, bpp);

	if (b >= t)
	{
	    /* initialize edge walkers */
	    RenderEdgeInit (&l, bpp, t,
			    traps->top.l + x_off_fixed,
			    traps->top.y + y_off_fixed,
			    traps->bot.l + x_off_fixed,
			    traps->bot.y + y_off_fixed);

	    RenderEdgeInit (&r, bpp, t,
			    traps->top.r + x_off_fixed,
			    traps->top.y + y_off_fixed,
			    traps->bot.r + x_off_fixed,
			    traps->bot.y + y_off_fixed);

	    fbRasterizeEdges (buf, bpp, width, stride, &l, &r, t, b);
	}
	traps++;
    }
}