106 lines
3.2 KiB
C
106 lines
3.2 KiB
C
/*
|
|
* Copyright © 2004 Keith Packard
|
|
*
|
|
* Permission to use, copy, modify, distribute, and sell this software and its
|
|
* documentation for any purpose is hereby granted without fee, provided that
|
|
* the above copyright notice appear in all copies and that both that
|
|
* copyright notice and this permission notice appear in supporting
|
|
* documentation, and that the name of Keith Packard not be used in
|
|
* advertising or publicity pertaining to distribution of the software without
|
|
* specific, written prior permission. Keith Packard makes no
|
|
* representations about the suitability of this software for any purpose. It
|
|
* is provided "as is" without express or implied warranty.
|
|
*
|
|
* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
|
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
|
|
* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
|
|
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
|
|
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
|
|
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
|
* PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#ifndef _RENDEREDGE_H_
|
|
#define _RENDEREDGE_H_
|
|
|
|
#include "picturestr.h"
|
|
|
|
#define MAX_ALPHA(n) ((1 << (n)) - 1)
|
|
#define N_Y_FRAC(n) ((n) == 1 ? 1 : (1 << ((n)/2)) - 1)
|
|
#define N_X_FRAC(n) ((1 << ((n)/2)) + 1)
|
|
|
|
#define STEP_Y_SMALL(n) (xFixed1 / N_Y_FRAC(n))
|
|
#define STEP_Y_BIG(n) (xFixed1 - (N_Y_FRAC(n) - 1) * STEP_Y_SMALL(n))
|
|
|
|
#define Y_FRAC_FIRST(n) (STEP_Y_SMALL(n) / 2)
|
|
#define Y_FRAC_LAST(n) (Y_FRAC_FIRST(n) + (N_Y_FRAC(n) - 1) * STEP_Y_SMALL(n))
|
|
|
|
#define STEP_X_SMALL(n) (xFixed1 / N_X_FRAC(n))
|
|
#define STEP_X_BIG(n) (xFixed1 - (N_X_FRAC(n) - 1) * STEP_X_SMALL(n))
|
|
|
|
#define X_FRAC_FIRST(n) (STEP_X_SMALL(n) / 2)
|
|
#define X_FRAC_LAST(n) (X_FRAC_FIRST(n) + (N_X_FRAC(n) - 1) * STEP_X_SMALL(n))
|
|
|
|
#define RenderSamplesX(x,n) ((n) == 1 ? 0 : (xFixedFrac (x) + X_FRAC_FIRST(n)) / STEP_X_SMALL(n))
|
|
|
|
/*
|
|
* An edge structure. This represents a single polygon edge
|
|
* and can be quickly stepped across small or large gaps in the
|
|
* sample grid
|
|
*/
|
|
typedef pixman_edge_t RenderEdge;
|
|
|
|
/*
|
|
* Step across a small sample grid gap
|
|
*/
|
|
#define RenderEdgeStepSmall(edge) { \
|
|
edge->x += edge->stepx_small; \
|
|
edge->e += edge->dx_small; \
|
|
if (edge->e > 0) \
|
|
{ \
|
|
edge->e -= edge->dy; \
|
|
edge->x += edge->signdx; \
|
|
} \
|
|
}
|
|
|
|
/*
|
|
* Step across a large sample grid gap
|
|
*/
|
|
#define RenderEdgeStepBig(edge) { \
|
|
edge->x += edge->stepx_big; \
|
|
edge->e += edge->dx_big; \
|
|
if (edge->e > 0) \
|
|
{ \
|
|
edge->e -= edge->dy; \
|
|
edge->x += edge->signdx; \
|
|
} \
|
|
}
|
|
|
|
extern _X_EXPORT xFixed
|
|
RenderSampleCeilY (xFixed y, int bpp);
|
|
|
|
extern _X_EXPORT xFixed
|
|
RenderSampleFloorY (xFixed y, int bpp);
|
|
|
|
extern _X_EXPORT void
|
|
RenderEdgeStep (RenderEdge *e, int n);
|
|
|
|
extern _X_EXPORT void
|
|
RenderEdgeInit (RenderEdge *e,
|
|
int bpp,
|
|
xFixed y_start,
|
|
xFixed x_top,
|
|
xFixed y_top,
|
|
xFixed x_bot,
|
|
xFixed y_bot);
|
|
|
|
extern _X_EXPORT void
|
|
RenderLineFixedEdgeInit (RenderEdge *e,
|
|
int bpp,
|
|
xFixed y,
|
|
xLineFixed *line,
|
|
int x_off,
|
|
int y_off);
|
|
|
|
#endif /* _RENDEREDGE_H_ */
|