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/*
* $Id: engine.h,v 1.1 2005-09-18 22:04:26 dhmunro Exp $
* Declare common properties of all GIST engines
*/
/* Copyright (c) 2005, The Regents of the University of California.
* All rights reserved.
* This file is part of yorick (http://yorick.sourceforge.net).
* Read the accompanying LICENSE file for details.
*/
#ifndef ENGINE_H
#define ENGINE_H
#include "gist.h"
/* ------------------------------------------------------------------------ */
struct Engine {
g_callbacks *on;
Engine *next;
Engine *nextActive;
char *name;
int active;
int marked; /* set if any marks have been made on current page */
int landscape; /* non-0 if page is wider than tall */
GpTransform transform; /* viewport in NDC, window in VDC */
GpXYMap devMap; /* actual coefficients for NDC->VDC mapping */
GpXYMap map; /* actual coefficients for WC->VDC mapping */
/* Current color palette (see gist.h) */
int colorChange; /* set this to alert Engine that palette has changed */
int colorMode; /* for hardcopy devices, set to dump palette to file */
int nColors;
GpColorCell *palette; /* pointer is NOT owned by this engine */
/* Handling incremental changes and damage to a drawing. */
Drauing *drawing;
int lastDrawn;
long systemsSeen[2];
int inhibit; /* set by GdAlert if next primitive is to be ignored */
int damaged;
GpBox damage; /* Never used if no ClearArea function provided */
/* --------------- Virtual function table ------------------- */
/* Close device and free all related memory (GpKillEngine) */
void (*Kill)(Engine *engine);
/* New page (frame advance) */
int (*Clear)(Engine *engine, int always);
/* Flush output buffers */
int (*Flush)(Engine *engine);
/* Change coordinate transformation (GpSetTrans)
If engine damaged, must set clipping to damage. */
void (*ChangeMap)(Engine *engine);
/* Change color palette (GpSetPalette) */
int (*ChangePalette)(Engine *engine); /* returns maximum palette size */
/* Polyline primitive. Segments have already been clipped. */
int (*DrawLines)(Engine *engine, long n, const GpReal *px,
const GpReal *py, int closed, int smooth);
/* Polymarker primitive. Points have already been clipped.
Can use GpPseudoMark if no intrinsic polymarker primitive. */
int (*DrawMarkers)(Engine *engine, long n,
const GpReal *px, const GpReal *py);
/* Text primitive. No clipping has yet been done. */
int (*DrwText)(Engine *engine, GpReal x0, GpReal y0, const char *text);
/* Filled area primitive. Polygon has already been clipped. */
int (*DrawFill)(Engine *engine, long n, const GpReal *px, const GpReal *py);
/* Cell array primitive. No clipping has yet been done. */
int (*DrawCells)(Engine *engine, GpReal px, GpReal py, GpReal qx, GpReal qy,
long width, long height, long nColumns,
const GpColor *colors);
/* Disjoint line primitive. Segments have already been clipped. */
int (*DrawDisjoint)(Engine *engine, long n, const GpReal *px,
const GpReal *py, const GpReal *qx, const GpReal *qy);
/* Clear a damaged area (box in NDC units) - set to 0 by GpNewEngine */
void (*ClearArea)(Engine *engine, GpBox *box);
};
/* Linked lists of all engines and of all active engines */
PLUG_API Engine *gistEngines;
PLUG_API Engine *gistActive;
/* Generic Engine constructor and destructor */
PLUG_API Engine *GpNewEngine(long size, char *name, g_callbacks *on,
GpTransform *transform, int landscape,
void (*Kill)(Engine*), int (*Clear)(Engine*,int), int (*Flush)(Engine*),
void (*ChangeMap)(Engine*), int (*ChangePalette)(Engine*),
int (*DrawLines)(Engine*,long,const GpReal*,const GpReal*,int,int),
int (*DrawMarkers)(Engine*,long,const GpReal*,const GpReal *),
int (*DrwText)(Engine*e,GpReal,GpReal,const char*),
int (*DrawFill)(Engine*,long,const GpReal*,const GpReal*),
int (*DrawCells)(Engine*,GpReal,GpReal,GpReal,GpReal,
long,long,long,const GpColor*),
int (*DrawDisjoint)(Engine*,long,const GpReal*,const GpReal*,
const GpReal*,const GpReal*));
PLUG_API void GpDelEngine(Engine *engine);
/* ------------------------------------------------------------------------ */
/* Coordinate mapping */
/* Set engine->devMap from engine->transform */
PLUG_API void GpDeviceMap(Engine *engine);
/* Compose WC->VDC engine->map coefficients given gistT (WC->NDC) and
engine->devMap (NDC->VDC). */
PLUG_API void GpComposeMap(Engine *engine);
/* The X window, CGM, and PostScript devices can all be based on
integer coordinate systems using points and segments which are
short integers. Here are some common routines for forming and
manipulating these. */
typedef struct GpPoint GpPoint;
struct GpPoint { /* same as X windows XPoint */
short x, y;
};
typedef struct GpSegment GpSegment;
struct GpSegment { /* same as X windows XSegment */
short x1, y1, x2, y2;
};
/* Returns number of points processed this pass (<=maxPoints) */
PLUG_API long GpIntPoints(const GpXYMap *map, long maxPoints, long n,
const GpReal *x, const GpReal *y, GpPoint **result);
/* Returns number of segments processed this pass (<=maxSegs) */
PLUG_API long GpIntSegs(const GpXYMap *map, long maxSegs, long n,
const GpReal *x1, const GpReal *y1,
const GpReal *x2, const GpReal *y2,GpSegment **result);
/* ------------------------------------------------------------------------ */
/* DrawMarkers based on DrwText. Uses Helvetica font, for use when:
(1) A device has no polymarker primitive, or
(2) You want the marker to be a character (used by GaLines) */
/* Note: GpPseudoMark is defined in gist.c to share static functions. */
PLUG_API int GpPseudoMark(Engine *engine, long n,
const GpReal *px, const GpReal *py);
/* Routine to clip cell array (one axis at a time) */
PLUG_API long GpClipCells(GpMap *map, GpReal *px, GpReal *qx,
GpReal xmin, GpReal xmax, long ncells, long *off);
/* Raw routine to inflict damage */
PLUG_API void GpDamage(Engine *eng, Drauing *drawing, GpBox *box);
/* ------------------------------------------------------------------------ */
#endif
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