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Port renderedge.c to pixman

This commit is contained in:
Soren Sandmann Pedersen 2007-05-23 13:08:26 -04:00
parent 3ba3ede9bb
commit 2a960c442b
2 changed files with 6 additions and 128 deletions
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119
render/renderedge.c
View File

@ -36,16 +36,7 @@
_X_EXPORT xFixed
RenderSampleCeilY (xFixed y, int n)
{
xFixed f = xFixedFrac(y);
xFixed i = xFixedFloor(y);
f = ((f + Y_FRAC_FIRST(n)) / STEP_Y_SMALL(n)) * STEP_Y_SMALL(n) + Y_FRAC_FIRST(n);
if (f > Y_FRAC_LAST(n))
{
f = Y_FRAC_FIRST(n);
i += xFixed1;
}
return (i | f);
return pixman_sample_ceil_y (y, n);
}
#define _div(a,b) ((a) >= 0 ? (a) / (b) : -((-(a) + (b) - 1) / (b)))
@ -57,16 +48,7 @@ RenderSampleCeilY (xFixed y, int n)
_X_EXPORT xFixed
RenderSampleFloorY (xFixed y, int n)
{
xFixed f = xFixedFrac(y);
xFixed i = xFixedFloor (y);
f = _div(f - Y_FRAC_FIRST(n), STEP_Y_SMALL(n)) * STEP_Y_SMALL(n) + Y_FRAC_FIRST(n);
if (f < Y_FRAC_FIRST(n))
{
f = Y_FRAC_LAST(n);
i -= xFixed1;
}
return (i | f);
return pixman_sample_floor_y (y, n);
}
/*
@ -75,52 +57,7 @@ RenderSampleFloorY (xFixed y, int n)
_X_EXPORT void
RenderEdgeStep (RenderEdge *e, int n)
{
xFixed_48_16 ne;
e->x += n * e->stepx;
ne = e->e + n * (xFixed_48_16) e->dx;
if (n >= 0)
{
if (ne > 0)
{
int nx = (ne + e->dy - 1) / e->dy;
e->e = ne - nx * (xFixed_48_16) e->dy;
e->x += nx * e->signdx;
}
}
else
{
if (ne <= -e->dy)
{
int nx = (-ne) / e->dy;
e->e = ne + nx * (xFixed_48_16) e->dy;
e->x -= nx * e->signdx;
}
}
}
/*
* A private routine to initialize the multi-step
* elements of an edge structure
*/
static void
_RenderEdgeMultiInit (RenderEdge *e, int n, xFixed *stepx_p, xFixed *dx_p)
{
xFixed stepx;
xFixed_48_16 ne;
ne = n * (xFixed_48_16) e->dx;
stepx = n * e->stepx;
if (ne > 0)
{
int nx = ne / e->dy;
ne -= nx * e->dy;
stepx += nx * e->signdx;
}
*dx_p = ne;
*stepx_p = stepx;
pixman_edge_step (e, n);
}
/*
@ -136,35 +73,7 @@ RenderEdgeInit (RenderEdge *e,
xFixed x_bot,
xFixed y_bot)
{
xFixed dx, dy;
e->x = x_top;
e->e = 0;
dx = x_bot - x_top;
dy = y_bot - y_top;
e->dy = dy;
e->dx = 0;
if (dy)
{
if (dx >= 0)
{
e->signdx = 1;
e->stepx = dx / dy;
e->dx = dx % dy;
e->e = -dy;
}
else
{
e->signdx = -1;
e->stepx = -(-dx / dy);
e->dx = -dx % dy;
e->e = 0;
}
_RenderEdgeMultiInit (e, STEP_Y_SMALL(n), &e->stepx_small, &e->dx_small);
_RenderEdgeMultiInit (e, STEP_Y_BIG(n), &e->stepx_big, &e->dx_big);
}
RenderEdgeStep (e, y_start - y_top);
pixman_edge_init (e, n, y_start, x_top, y_top, x_bot, y_bot);
}
/*
@ -179,24 +88,6 @@ RenderLineFixedEdgeInit (RenderEdge *e,
int x_off,
int y_off)
{
xFixed x_off_fixed = IntToxFixed(x_off);
xFixed y_off_fixed = IntToxFixed(y_off);
xPointFixed *top, *bot;
if (line->p1.y <= line->p2.y)
{
top = &line->p1;
bot = &line->p2;
}
else
{
top = &line->p2;
bot = &line->p1;
}
RenderEdgeInit (e, n, y,
top->x + x_off_fixed,
top->y + y_off_fixed,
bot->x + x_off_fixed,
bot->y + y_off_fixed);
pixman_line_fixed_edge_init (e, n, y, (pixman_line_fixed_t *)line, x_off, y_off);
}

15
render/renderedge.h
View File

@ -50,20 +50,7 @@
* and can be quickly stepped across small or large gaps in the
* sample grid
*/
typedef struct {
xFixed x;
xFixed e;
xFixed stepx;
xFixed signdx;
xFixed dy;
xFixed dx;
xFixed stepx_small;
xFixed stepx_big;
xFixed dx_small;
xFixed dx_big;
} RenderEdge;
typedef pixman_edge_t RenderEdge;
/*
* Step across a small sample grid gap