cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync/*
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * Copyright © 2004 Keith Packard
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync *
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * Permission to use, copy, modify, distribute, and sell this software and its
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * documentation for any purpose is hereby granted without fee, provided that
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * the above copyright notice appear in all copies and that both that
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * copyright notice and this permission notice appear in supporting
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * documentation, and that the name of Keith Packard not be used in
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * advertising or publicity pertaining to distribution of the software without
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * specific, written prior permission. Keith Packard makes no
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * representations about the suitability of this software for any purpose. It
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * is provided "as is" without express or implied warranty.
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync *
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * PERFORMANCE OF THIS SOFTWARE.
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync */
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#ifndef _RENDEREDGE_H_
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#define _RENDEREDGE_H_
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#include "picturestr.h"
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#define MAX_ALPHA(n) ((1 << (n)) - 1)
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#define N_Y_FRAC(n) ((n) == 1 ? 1 : (1 << ((n)/2)) - 1)
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#define N_X_FRAC(n) ((1 << ((n)/2)) + 1)
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#define STEP_Y_SMALL(n) (xFixed1 / N_Y_FRAC(n))
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#define STEP_Y_BIG(n) (xFixed1 - (N_Y_FRAC(n) - 1) * STEP_Y_SMALL(n))
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#define Y_FRAC_FIRST(n) (STEP_Y_SMALL(n) / 2)
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#define Y_FRAC_LAST(n) (Y_FRAC_FIRST(n) + (N_Y_FRAC(n) - 1) * STEP_Y_SMALL(n))
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#define STEP_X_SMALL(n) (xFixed1 / N_X_FRAC(n))
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#define STEP_X_BIG(n) (xFixed1 - (N_X_FRAC(n) - 1) * STEP_X_SMALL(n))
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#define X_FRAC_FIRST(n) (STEP_X_SMALL(n) / 2)
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#define X_FRAC_LAST(n) (X_FRAC_FIRST(n) + (N_X_FRAC(n) - 1) * STEP_X_SMALL(n))
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#define RenderSamplesX(x,n) ((n) == 1 ? 0 : (xFixedFrac (x) + X_FRAC_FIRST(n)) / STEP_X_SMALL(n))
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync/*
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * An edge structure. This represents a single polygon edge
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * and can be quickly stepped across small or large gaps in the
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * sample grid
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync */
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsynctypedef pixman_edge_t RenderEdge;
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync/*
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * Step across a small sample grid gap
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync */
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#define RenderEdgeStepSmall(edge) { \
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync edge->x += edge->stepx_small; \
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync edge->e += edge->dx_small; \
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync if (edge->e > 0) \
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync { \
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync edge->e -= edge->dy; \
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync edge->x += edge->signdx; \
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync } \
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync}
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync/*
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync * Step across a large sample grid gap
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync */
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#define RenderEdgeStepBig(edge) { \
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync edge->x += edge->stepx_big; \
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync edge->e += edge->dx_big; \
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync if (edge->e > 0) \
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync { \
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync edge->e -= edge->dy; \
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync edge->x += edge->signdx; \
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync } \
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync}
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsyncextern _X_EXPORT xFixed
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsyncRenderSampleCeilY (xFixed y, int bpp);
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsyncextern _X_EXPORT xFixed
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsyncRenderSampleFloorY (xFixed y, int bpp);
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsyncextern _X_EXPORT void
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsyncRenderEdgeStep (RenderEdge *e, int n);
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsyncextern _X_EXPORT void
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsyncRenderEdgeInit (RenderEdge *e,
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync int bpp,
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync xFixed y_start,
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync xFixed x_top,
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync xFixed y_top,
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync xFixed x_bot,
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync xFixed y_bot);
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsyncextern _X_EXPORT void
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsyncRenderLineFixedEdgeInit (RenderEdge *e,
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync int bpp,
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync xFixed y,
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync xLineFixed *line,
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync int x_off,
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync int y_off);
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync
cabde247f900dcf6e58d009bbdd15099c028c6fcvboxsync#endif /* _RENDEREDGE_H_ */