X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?p=xscreensaver;a=blobdiff_plain;f=hacks%2Fstrange.c;h=c730259c41b1d482b339b94cac992a496d64700a;hp=71cd89cdbbc0abd8a4a1ef8831abdff168f53dd9;hb=96a411663168b0ba5432b407a83be55f3df0c802;hpb=f3e0240915ed9f9b3a61781f5c7002d587563fe0 diff --git a/hacks/strange.c b/hacks/strange.c index 71cd89cd..c730259c 100644 --- a/hacks/strange.c +++ b/hacks/strange.c @@ -1,11 +1,12 @@ -/* -*- Mode: C; tab-width: 4 -*- - * strange --- Strange attractors are not so hard to find... - */ -#if !defined( lint ) && !defined( SABER ) -static const char sccsid[] = "@(#)strange.c 4.02 97/04/01 xlockmore"; +/* -*- Mode: C; tab-width: 4 -*- */ +/* strange --- strange attractors */ + +#if 0 +static const char sccsid[] = "@(#)strange.c 5.00 2000/11/01 xlockmore"; #endif -/* Copyright (c) 1997 by Massimino Pascal (Pascal.Massimon@ens.fr) +/*- + * Copyright (c) 1997 by Massimino Pascal * * Permission to use, copy, modify, and distribute this software and its * documentation for any purpose and without fee is hereby granted, @@ -20,29 +21,41 @@ static const char sccsid[] = "@(#)strange.c 4.02 97/04/01 xlockmore"; * other special, indirect and consequential damages. * * Revision History: - * 10-May-97: jwz@netscape.com: turned into a standalone program. - * Made it render into an offscreen bitmap and then copy - * that onto the screen, to reduce flicker. + * 01-Nov-2000: Allocation checks + * 10-May-1997: jwz@jwz.org: turned into a standalone program. + * Made it render into an offscreen bitmap and then copy + * that onto the screen, to reduce flicker. + * + * strange attractors are not so hard to find... */ #ifdef STANDALONE -# define PROGCLASS "Strange" -# define HACK_INIT init_strange -# define HACK_DRAW draw_strange -# define strange_opts xlockmore_opts -# define DEFAULTS "*delay: 2000 \n" \ - "*ncolors: 100 \n" -# define SMOOTH_COLORS -# include "xlockmore.h" /* from the xscreensaver distribution */ -#else /* !STANDALONE */ -# include "xlock.h" /* from the xlockmore distribution */ +#define MODE_strange +#define PROGCLASS "Strange" +#define HACK_INIT init_strange +#define HACK_DRAW draw_strange +#define strange_opts xlockmore_opts +#define DEFAULTS "*delay: 2000 \n" \ + "*ncolors: 100 \n" +#define SMOOTH_COLORS +#include "xlockmore.h" /* from the xscreensaver distribution */ +#else /* !STANDALONE */ +#include "xlock.h" /* from the xlockmore distribution */ #endif /* !STANDALONE */ -ModeSpecOpt strange_opts = { - 0, NULL, 0, NULL, NULL }; +#ifdef MODE_strange + +ModeSpecOpt strange_opts = +{0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL}; -/*****************************************************/ -/*****************************************************/ +#ifdef USE_MODULES +ModStruct strange_description = +{"strange", "init_strange", "draw_strange", "release_strange", + "init_strange", "init_strange", (char *) NULL, &strange_opts, + 1000, 1, 1, 1, 64, 1.0, "", + "Shows strange attractors", 0, NULL}; + +#endif typedef float DBL; typedef int PRM; @@ -56,39 +69,33 @@ typedef int PRM; #define DBL_To_PRM(x) (PRM)( (DBL)(UNIT)*(x) ) -#define DO_FOLD(a) (a)<0 ? -Fold[ (-(a))&(UNIT2-1) ] : Fold[ (a)&(UNIT2-1) ] - -/* - #define DO_FOLD(a) (a)<-UNIT2 ? -Fold[(-(a))%UNIT2] : (a)<0 ? -Fold[ -(a) ] +#define DO_FOLD(a) (a)<0 ? -A->Fold[ (-(a))&(UNIT2-1) ] : A->Fold[ (a)&(UNIT2-1) ] - : \ (a)>UNIT2 ? Fold[ (a)%UNIT2 ] : Fold[ (a) ] */ -/* #define DO_FOLD(a) DBL_To_PRM( sin( (DBL)(a)/UNIT ) ) */ -/* - #define DO_FOLD(a) (a)<0 ? DBL_To_PRM( exp( 16.0*(a)/UNIT2 ) )-1.0 : \ - DBL_To_PRM( 1.0-exp( -16.0*(a)/UNIT2 ) ) */ +#if 0 +#define DO_FOLD(a) (a)<-UNIT2 ? -A->Fold[(-(a))%UNIT2] : (a)<0 ? -A->Fold[ -(a) ] :\ +(a)>UNIT2 ? A->Fold[ (a)%UNIT2 ] : A->Fold[ (a) ] +#define DO_FOLD(a) DBL_To_PRM( sin( (DBL)(a)/UNIT ) ) +#define DO_FOLD(a) (a)<0 ? DBL_To_PRM( exp( 16.0*(a)/UNIT2 ) )-1.0 : \ +DBL_To_PRM( 1.0-exp( -16.0*(a)/UNIT2 ) ) +#endif /******************************************************************/ #define MAX_PRM 3*5 -typedef struct { +typedef struct _ATTRACTOR { DBL Prm1[MAX_PRM], Prm2[MAX_PRM]; - void (*Iterate) (PRM, PRM, PRM *, PRM *); + PRM Prm[MAX_PRM], *Fold; + void (*Iterate) (struct _ATTRACTOR *, PRM, PRM, PRM *, PRM *); XPoint *Buffer1, *Buffer2; int Cur_Pt, Max_Pt; int Col, Count, Speed; int Width, Height; - Pixmap dbuf; /* jwz */ - GC dbuf_gc; + Pixmap dbuf; /* jwz */ + GC dbuf_gc; } ATTRACTOR; -static ATTRACTOR *Root; -static PRM xmin, xmax, ymin, ymax; -static PRM Prm[MAX_PRM]; -static PRM *Fold = NULL; - -/******************************************************************/ -/******************************************************************/ +static ATTRACTOR *Root = (ATTRACTOR *) NULL; static DBL Amp_Prm[MAX_PRM] = { @@ -130,7 +137,7 @@ Random_Prm(DBL * Prm) /* 2 examples of non-linear map */ static void -Iterate_X2(PRM x, PRM y, PRM * xo, PRM * yo) +Iterate_X2(ATTRACTOR * A, PRM x, PRM y, PRM * xo, PRM * yo) { PRM xx, yy, xy, x2y, y2x, Tmp; @@ -140,16 +147,16 @@ Iterate_X2(PRM x, PRM y, PRM * xo, PRM * yo) y2x = (yy * x) / UNIT; xy = (x * y) / UNIT; - Tmp = Prm[1] * xx + Prm[2] * xy + Prm[3] * yy + Prm[4] * x2y; - Tmp = Prm[0] - y + (Tmp / UNIT); + Tmp = A->Prm[1] * xx + A->Prm[2] * xy + A->Prm[3] * yy + A->Prm[4] * x2y; + Tmp = A->Prm[0] - y + (Tmp / UNIT); *xo = DO_FOLD(Tmp); - Tmp = Prm[6] * xx + Prm[7] * xy + Prm[8] * yy + Prm[9] * y2x; - Tmp = Prm[5] + x + (Tmp / UNIT); + Tmp = A->Prm[6] * xx + A->Prm[7] * xy + A->Prm[8] * yy + A->Prm[9] * y2x; + Tmp = A->Prm[5] + x + (Tmp / UNIT); *yo = DO_FOLD(Tmp); } static void -Iterate_X3(PRM x, PRM y, PRM * xo, PRM * yo) +Iterate_X3(ATTRACTOR * A, PRM x, PRM y, PRM * xo, PRM * yo) { PRM xx, yy, xy, x2y, y2x, Tmp_x, Tmp_y, Tmp_z; @@ -159,60 +166,85 @@ Iterate_X3(PRM x, PRM y, PRM * xo, PRM * yo) y2x = (yy * x) / UNIT; xy = (x * y) / UNIT; - Tmp_x = Prm[1] * xx + Prm[2] * xy + Prm[3] * yy + Prm[4] * x2y; - Tmp_x = Prm[0] - y + (Tmp_x / UNIT); + Tmp_x = A->Prm[1] * xx + A->Prm[2] * xy + A->Prm[3] * yy + A->Prm[4] * x2y; + Tmp_x = A->Prm[0] - y + (Tmp_x / UNIT); Tmp_x = DO_FOLD(Tmp_x); - Tmp_y = Prm[6] * xx + Prm[7] * xy + Prm[8] * yy + Prm[9] * y2x; - Tmp_y = Prm[5] + x + (Tmp_y / UNIT); + Tmp_y = A->Prm[6] * xx + A->Prm[7] * xy + A->Prm[8] * yy + A->Prm[9] * y2x; + Tmp_y = A->Prm[5] + x + (Tmp_y / UNIT); Tmp_y = DO_FOLD(Tmp_y); - Tmp_z = Prm[11] * xx + Prm[12] * xy + Prm[13] * yy + Prm[14] * y2x; - Tmp_z = Prm[10] + x + (Tmp_z / UNIT); + Tmp_z = A->Prm[11] * xx + A->Prm[12] * xy + A->Prm[13] * yy + A->Prm[14] * y2x; + Tmp_z = A->Prm[10] + x + (Tmp_z / UNIT); Tmp_z = UNIT + Tmp_z * Tmp_z / UNIT; *xo = (Tmp_x * UNIT) / Tmp_z; *yo = (Tmp_y * UNIT) / Tmp_z; } -static void (*Funcs[2]) (PRM, PRM, PRM *, PRM *) = { +static void (*Funcs[2]) (ATTRACTOR *, PRM, PRM, PRM *, PRM *) = { Iterate_X2, Iterate_X3 }; /***************************************************************/ +static void +free_strange(Display *display, ATTRACTOR *A) +{ + if (A->Buffer1 != NULL) { + (void) free((void *) A->Buffer1); + A->Buffer1 = (XPoint *) NULL; + } + if (A->Buffer2 != NULL) { + (void) free((void *) A->Buffer2); + A->Buffer2 = (XPoint *) NULL; + } + if (A->dbuf) { + XFreePixmap(display, A->dbuf); + A->dbuf = None; + } + if (A->dbuf_gc) { + XFreeGC(display, A->dbuf_gc); + A->dbuf_gc = None; + } + if (A->Fold != NULL) { + (void) free((void *) A->Fold); + A->Fold = (PRM *) NULL; + } +} + void draw_strange(ModeInfo * mi) { - int i, j, n, Max_Colors, Cur_Pt; + int i, j, n, Cur_Pt; PRM x, y, xo, yo; DBL u; - ATTRACTOR *A; XPoint *Buf; - Display *display; - GC gc; - Window window; + Display *display = MI_DISPLAY(mi); + Window window = MI_WINDOW(mi); + GC gc = MI_GC(mi); DBL Lx, Ly; - void (*Iterate) (PRM, PRM, PRM *, PRM *); - - display = MI_DISPLAY(mi); - window = MI_WINDOW(mi); - gc = MI_GC(mi); - Max_Colors = MI_NPIXELS(mi); + void (*Iterate) (ATTRACTOR *, PRM, PRM, PRM *, PRM *); + PRM xmin, xmax, ymin, ymax; + ATTRACTOR *A; + if (Root == NULL) + return; A = &Root[MI_SCREEN(mi)]; + if (A->Fold == NULL) + return; Cur_Pt = A->Cur_Pt; Iterate = A->Iterate; u = (DBL) (A->Count) / 1000.0; for (j = MAX_PRM - 1; j >= 0; --j) - Prm[j] = DBL_To_PRM((1.0 - u) * A->Prm1[j] + u * A->Prm2[j]); + A->Prm[j] = DBL_To_PRM((1.0 - u) * A->Prm1[j] + u * A->Prm2[j]); x = y = DBL_To_PRM(.0); for (n = SKIP_FIRST; n; --n) { - (*Iterate) (x, y, &xo, &yo); + (*Iterate) (A, x, y, &xo, &yo); x = xo + NRAND(8) - 4; y = yo + NRAND(8) - 4; } @@ -226,9 +258,9 @@ draw_strange(ModeInfo * mi) Lx = (DBL) A->Width / UNIT / 2.2; Ly = (DBL) A->Height / UNIT / 2.2; for (n = A->Max_Pt; n; --n) { - (*Iterate) (x, y, &xo, &yo); - Buf->x = (short) (Lx * (x + DBL_To_PRM(1.1))); - Buf->y = (short) (Ly * (DBL_To_PRM(1.1) - y)); + (*Iterate) (A, x, y, &xo, &yo); + Buf->x = (int) (Lx * (x + DBL_To_PRM(1.1))); + Buf->y = (int) (Ly * (DBL_To_PRM(1.1) - y)); /* (void) fprintf( stderr, "X,Y: %d %d ", Buf->x, Buf->y ); */ Buf++; A->Cur_Pt++; @@ -244,34 +276,30 @@ draw_strange(ModeInfo * mi) y = yo + NRAND(8) - 4; } - XSetForeground(display, gc, MI_WIN_BLACK_PIXEL(mi)); + MI_IS_DRAWN(mi) = True; - if (A->dbuf) /* jwz */ - { - XSetForeground(display, A->dbuf_gc, 0); -/* XDrawPoints(display, A->dbuf, A->dbuf_gc, A->Buffer1, - Cur_Pt,CoordModeOrigin);*/ - XFillRectangle(display, A->dbuf, A->dbuf_gc, 0,0, A->Width, A->Height); - } - else - XDrawPoints(display, window, gc, A->Buffer1, Cur_Pt, CoordModeOrigin); + XSetForeground(display, gc, MI_BLACK_PIXEL(mi)); - if (Max_Colors < 2) - XSetForeground(display, gc, MI_WIN_WHITE_PIXEL(mi)); + if (A->dbuf != None) { /* jwz */ + XSetForeground(display, A->dbuf_gc, 0); +/* XDrawPoints(display, A->dbuf, A->dbuf_gc, A->Buffer1, + Cur_Pt,CoordModeOrigin); */ + XFillRectangle(display, A->dbuf, A->dbuf_gc, 0, 0, A->Width, A->Height); + } else + XDrawPoints(display, window, gc, A->Buffer1, Cur_Pt, CoordModeOrigin); + + if (MI_NPIXELS(mi) < 2) + XSetForeground(display, gc, MI_WHITE_PIXEL(mi)); else - XSetForeground(display, gc, MI_PIXEL(mi, A->Col % Max_Colors)); + XSetForeground(display, gc, MI_PIXEL(mi, A->Col % MI_NPIXELS(mi))); - if (A->dbuf) - { + if (A->dbuf != None) { XSetForeground(display, A->dbuf_gc, 1); XDrawPoints(display, A->dbuf, A->dbuf_gc, A->Buffer2, A->Cur_Pt, - CoordModeOrigin); - } - else - XDrawPoints(display, window, gc, A->Buffer2, A->Cur_Pt, CoordModeOrigin); - - if (A->dbuf) - XCopyPlane(display, A->dbuf, window, gc, 0,0,A->Width,A->Height,0,0, 1); + CoordModeOrigin); + XCopyPlane(display, A->dbuf, window, gc, 0, 0, A->Width, A->Height, 0, 0, 1); + } else + XDrawPoints(display, window, gc, A->Buffer2, A->Cur_Pt, CoordModeOrigin); Buf = A->Buffer1; A->Buffer1 = A->Buffer2; @@ -296,20 +324,26 @@ draw_strange(ModeInfo * mi) void init_strange(ModeInfo * mi) { + Display *display = MI_DISPLAY(mi); + Window window = MI_WINDOW(mi); + GC gc = MI_GC(mi); ATTRACTOR *Attractor; if (Root == NULL) { - Root = (ATTRACTOR *) calloc( - MI_NUM_SCREENS(mi), sizeof (ATTRACTOR)); - if (Root == NULL) + if ((Root = (ATTRACTOR *) calloc(MI_NUM_SCREENS(mi), + sizeof (ATTRACTOR))) == NULL) return; } - if (Fold == NULL) { + Attractor = &Root[MI_SCREEN(mi)]; + + if (Attractor->Fold == NULL) { int i; - Fold = (PRM *) calloc(UNIT2 + 1, sizeof (PRM)); - if (Fold == NULL) + if ((Attractor->Fold = (PRM *) calloc(UNIT2 + 1, + sizeof (PRM))) == NULL) { + free_strange(display, Attractor); return; + } for (i = 0; i <= UNIT2; ++i) { DBL x; @@ -320,21 +354,25 @@ init_strange(ModeInfo * mi) /* x = x*(1.0-x)*4.0; */ x = (DBL) (i) / UNIT; x = sin(x); - Fold[i] = DBL_To_PRM(x); + Attractor->Fold[i] = DBL_To_PRM(x); } } - Attractor = &Root[MI_SCREEN(mi)]; - - Attractor->Buffer1 = (XPoint *) calloc(MAX_POINTS, sizeof (XPoint)); if (Attractor->Buffer1 == NULL) - goto Abort; - Attractor->Buffer2 = (XPoint *) calloc(MAX_POINTS, sizeof (XPoint)); + if ((Attractor->Buffer1 = (XPoint *) calloc(MAX_POINTS, + sizeof (XPoint))) == NULL) { + free_strange(display, Attractor); + return; + } if (Attractor->Buffer2 == NULL) - goto Abort; + if ((Attractor->Buffer2 = (XPoint *) calloc(MAX_POINTS, + sizeof (XPoint))) == NULL) { + free_strange(display, Attractor); + return; + } Attractor->Max_Pt = MAX_POINTS; - Attractor->Width = MI_WIN_WIDTH(mi); - Attractor->Height = MI_WIN_HEIGHT(mi); + Attractor->Width = MI_WIDTH(mi); + Attractor->Height = MI_HEIGHT(mi); Attractor->Cur_Pt = 0; Attractor->Count = 0; Attractor->Col = NRAND(MI_NPIXELS(mi)); @@ -343,37 +381,41 @@ init_strange(ModeInfo * mi) Attractor->Iterate = Funcs[NRAND(2)]; Random_Prm(Attractor->Prm1); Random_Prm(Attractor->Prm2); +#ifndef NO_DBUF + if (Attractor->dbuf != None) + XFreePixmap(display, Attractor->dbuf); + Attractor->dbuf = XCreatePixmap(display, window, + Attractor->Width, Attractor->Height, 1); + /* Allocation checked */ + if (Attractor->dbuf != None) { + XGCValues gcv; - Attractor->dbuf = XCreatePixmap(MI_DISPLAY(mi), MI_WINDOW(mi), - Attractor->Width, Attractor->Height, 1); - if (Attractor->dbuf) - { - XGCValues gcv; gcv.foreground = 0; gcv.background = 0; + gcv.graphics_exposures = False; gcv.function = GXcopy; - Attractor->dbuf_gc = XCreateGC(MI_DISPLAY(mi), Attractor->dbuf, - GCForeground|GCBackground|GCFunction, - &gcv); - XFillRectangle(MI_DISPLAY(mi), Attractor->dbuf, - Attractor->dbuf_gc, 0,0, Attractor->Width, - Attractor->Height); - XSetBackground(MI_DISPLAY(mi), MI_GC(mi), MI_WIN_BLACK_PIXEL(mi)); - XSetFunction(MI_DISPLAY(mi), MI_GC(mi), GXcopy); - } - - XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi)); - return; - - Abort: - if (Attractor->Buffer1 != NULL) - free(Attractor->Buffer1); - if (Attractor->Buffer2 != NULL) - free(Attractor->Buffer2); - Attractor->Buffer1 = NULL; - Attractor->Buffer2 = NULL; - Attractor->Cur_Pt = 0; - return; + + if (Attractor->dbuf_gc != None) + XFreeGC(display, Attractor->dbuf_gc); + + if ((Attractor->dbuf_gc = XCreateGC(display, Attractor->dbuf, + GCForeground | GCBackground | GCGraphicsExposures | GCFunction, + &gcv)) == None) { + XFreePixmap(display, Attractor->dbuf); + Attractor->dbuf = None; + } else { + XFillRectangle(display, Attractor->dbuf, Attractor->dbuf_gc, + 0, 0, Attractor->Width, Attractor->Height); + XSetBackground(display, gc, MI_BLACK_PIXEL(mi)); + XSetFunction(display, gc, GXcopy); + } + } +#endif + + MI_CLEARWINDOW(mi); + + /* Do not want any exposure events from XCopyPlane */ + XSetGraphicsExposures(display, MI_GC(mi), False); } /***************************************************************/ @@ -381,24 +423,14 @@ init_strange(ModeInfo * mi) void release_strange(ModeInfo * mi) { - int i; - - if (Root == NULL) - return; + if (Root != NULL) { + int screen; - for (i = 0; i < MI_NUM_SCREENS(mi); ++i) { - if (Root[i].Buffer1 != NULL) - free(Root[i].Buffer1); - if (Root[i].Buffer2 != NULL) - free(Root[i].Buffer2); - if (Root[i].dbuf) - XFreePixmap(MI_DISPLAY(mi), Root[i].dbuf); - if (Root[i].dbuf_gc) - XFreeGC(MI_DISPLAY(mi), Root[i].dbuf_gc); + for (screen = 0; screen < MI_NUM_SCREENS(mi); ++screen) + free_strange(MI_DISPLAY(mi), &Root[screen]); + (void) free((void *) Root); + Root = (ATTRACTOR *) NULL; } - free(Root); - Root = NULL; - if (Fold != NULL) - free(Fold); - Fold = NULL; } + +#endif /* MODE_strange */