Original 5.40

1 files changed, 587 insertions, 0 deletions

diff --git a/hacks/binaryring.c b/hacks/binaryring.c
new file mode 100644
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--- /dev/null
+++ b/hacks/binaryring.c
@@ -0,0 +1,587 @@
+/*
+ * Binary Ring
+ * Copyright (c) 2006-2014 Emilio Del Tessandoro <emilio.deltessa@gmail.com>
+ *
+ *  Directly ported code from complexification.net Binary Ring art
+ *  http://www.complexification.net/gallery/machines/binaryRing/appletm/BinaryRing_m.pde
+ *
+ *  Binary Ring code:
+ *  j.tarbell   June, 2004
+ *  Albuquerque, New Mexico
+ *  complexification.net
+ *
+ * Directly based the hacks of: 
+ * 
+ * xscreensaver, Copyright (c) 1997, 1998, 2002 Jamie Zawinski <jwz@jwz.org>
+ *
+ * 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.  No representations are made about the suitability of this
+ * software for any purpose.  It is provided "as is" without express or 
+ * implied warranty.
+ */
+
+#include "screenhack.h"
+#include "colors.h"
+#include "hsv.h"
+
+#define ANTIALIAS   1
+#define BLACK       0
+#define WHITE       1
+
+#define swap(a, b)  do { __typeof__(a) tmp;  tmp = a; a = b; b = tmp; } while(0)
+#define frand1()    ((((int) random() ) << 1) * 4.65661287524579692411E-10)
+#define min(a,b) ((a)<(b)?(a):(b))
+#define max(a,b) ((a)>(b)?(a):(b))
+
+/* better if signed */
+typedef unsigned long pixel_t;
+
+
+typedef struct {
+    float x, y;
+    float xx, yy;
+    float vx, vy;
+    float color;
+    int age;            /* age from 0 to ageMax */
+} particle_t;
+
+
+struct state {
+    int epoch;
+    int growth_delay;
+    int ring_radius;
+    int max_age;
+    float curliness;
+    int particles_number;
+    particle_t* particles;
+
+
+    Display *display;               /* variables for the X stuff */
+    Window window;
+    GC gc;
+    XGCValues gcv;
+    Visual* visual;
+    int depth;
+
+    int width;
+    int height;
+
+    Pixmap pix;		                /* for reshape */
+    XImage* buf;		            /* buffer */
+    pixel_t* buffer;
+    pixel_t colors[2];
+
+    Bool color;
+};
+
+
+
+static void point2rgb(int depth, pixel_t c, int *r, int *g, int *b) 
+{
+    switch(depth) {
+    case 32:
+    case 24:
+#ifdef HAVE_JWXYZ
+        /* This program idiotically does not go through a color map, so
+               we have to hardcode in knowledge of how jwxyz.a packs pixels!
+               Fix it to go through st->colors[st->ncolors] instead!
+             */
+        *r = (c & 0x00ff0000) >> 16;
+        *g = (c & 0x0000ffff) >>  8;
+        *b = (c & 0x000000ff);
+#else
+        *g = (c & 0xff00) >> 8;
+        *r = (c & 0xff0000) >> 16;
+        *b = c & 0xff;
+#endif
+        break;
+    case 16:
+        *g = ((c >> 5) & 0x3f) << 2;
+        *r = ((c >> 11) & 0x1f) << 3;
+        *b = (c & 0x1f) << 3;
+        break;
+    case 15:
+        *g = ((c >> 5) & 0x1f) << 3;
+        *r = ((c >> 10) & 0x1f) << 3;
+        *b = (c & 0x1f) << 3;
+        break;
+    }
+}
+
+static pixel_t rgb2point(int depth, int r, int g, int b) 
+{
+    pixel_t ret = 0;
+
+    switch(depth) {
+    case 32:
+    case 24:
+#ifdef HAVE_JWXYZ
+        /* This program idiotically does not go through a color map, so
+               we have to hardcode in knowledge of how jwxyz.a packs pixels!
+               Fix it to go through st->colors[st->ncolors] instead!
+             */
+        ret = 0xFF000000 | (r << 16) | (g << 8) | b;
+#else
+        ret |= (r << 16) | (g << 8) | b;
+#endif
+        break;
+    case 16:
+        ret = ((r>>3) << 11) | ((g>>2)<<5) | (b>>3);
+        break;
+    case 15:
+        ret = ((r>>3) << 10) | ((g>>3)<<5) | (b>>3);
+        break;
+    }
+
+    return ret;
+}
+
+void print_color ( struct state* st, pixel_t color );
+/* alpha blended point drawing -- this is Not Right and will likely fail on 
+ * non-intel platforms as it is now, needs fixing
+ */
+
+static
+void draw_point ( struct state* st,
+                 int x, int y, pixel_t myc, float a ) {
+
+    int or = 0, og = 0, ob = 0;
+    int r = 0, g = 0, b = 0;
+    int nr, ng, nb;
+    register pixel_t c;
+
+    /*or = st->buffer[ 3 * ( y * st->width + x ) + 0 ];
+    og = st->buffer[ 3 * ( y * st->width + x ) + 1 ];
+    ob = st->buffer[ 3 * ( y * st->width + x ) + 2 ];*/
+    
+    c = st->buffer[ y * st->width + x ];
+    point2rgb( st->depth, c, &or, &og, &ob );
+    point2rgb( st->depth, myc, &r, &g, &b );
+
+    nr = or + (r - or) * a;
+    ng = og + (g - og) * a;
+    nb = ob + (b - ob) * a;
+
+    /*st->buffer[ 3 * ( y * st->width + x ) + 0 ] = nr;
+    st->buffer[ 3 * ( y * st->width + x ) + 1 ] = ng;
+    st->buffer[ 3 * ( y * st->width + x ) + 2 ] = nb;*/
+    c = rgb2point(st->depth, nr, ng, nb);
+    st->buffer[ y * st->width + x ] = c;
+
+    XPutPixel( st->buf, x, y, c );
+}
+
+
+
+
+void print_color ( struct state* st, pixel_t color ) {
+    int r=0, g=0, b=0;
+    point2rgb(st->depth, color, &r, &g, &b);
+    printf( "%d %d %d\n", r, g, b);
+}
+
+
+
+#if ANTIALIAS
+#define plot_(X,Y,D) do{    \
+    _dla_plot(st, (X), (Y), color, (D) * alpha); }while(0)
+
+static
+void _dla_plot(struct state* st, int x, int y, pixel_t col, float br)
+{
+    if ( ( x >= 0 && x < st->width ) && ( y >= 0 && y < st->height ) ) {
+        if ( br > 1.0f ) br = 1.0f;
+        draw_point( st, x, y, col, br );
+    }
+}
+
+#define ipart_(X) ((int)(X))
+#define round_(X) ((int)(((float)(X))+0.5))
+#define fpart_(X) (((float)(X))-(float)ipart_(X))
+#define rfpart_(X) (1.0-fpart_(X))
+
+static
+void draw_line_antialias(
+        struct state* st,
+        int x1, int y1,
+        int x2, int y2,
+        pixel_t color, float alpha )
+{
+    float dx = (float)x2 - (float)x1;
+    float dy = (float)y2 - (float)y1;
+    float gradient;
+    float xend;
+    float yend;
+    float xgap;
+    float ygap;
+    int xpxl1;
+    int ypxl1;
+    float intery;
+    float interx;
+    int xpxl2;
+    int ypxl2;
+    int x;
+    int y;
+
+    /* hard clipping, because this routine has some problems with negative coordinates */
+    /* TODO: fix the alpha for that boundary cases. Using fabs() could solve? */
+    if ( ( x1 < 0 || x1 > st->width ) ||
+         ( x2 < 0 || x2 > st->width ) ||
+         ( y1 < 0 || y1 > st->height ) ||
+         ( y2 < 0 || y2 > st->height ) )
+        return;
+
+    if ( fabs(dx) > fabs(dy) ) {
+        if ( x2 < x1 ) {
+            swap(x1, x2);
+            swap(y1, y2);
+        }
+        gradient = dy / dx;
+        xend = round_(x1);
+        yend = y1 + gradient*(xend - x1);
+        xgap = rfpart_(x1 + 0.5);
+        xpxl1 = xend;
+        ypxl1 = ipart_(yend);
+        plot_(xpxl1, ypxl1, rfpart_(yend)*xgap);
+        plot_(xpxl1, ypxl1+1, fpart_(yend)*xgap);
+        intery = yend + gradient;
+
+        xend = round_(x2);
+        yend = y2 + gradient*(xend - x2);
+        xgap = fpart_(x2+0.5);
+        xpxl2 = xend;
+        ypxl2 = ipart_(yend);
+        plot_(xpxl2, ypxl2, rfpart_(yend) * xgap);
+        plot_(xpxl2, ypxl2 + 1, fpart_(yend) * xgap);
+
+        /*if ( rfpart_(yend) * xgap < 0 || fpart_(yend) * xgap < 0)
+        printf("%f %f\n", rfpart_(yend) * xgap, fpart_(yend) * xgap);*/
+        for(x=xpxl1+1; x <= (xpxl2-1); x++) {
+            plot_(x, ipart_(intery), rfpart_(intery));
+            plot_(x, ipart_(intery) + 1, fpart_(intery));
+            /*if ( rfpart_(intery) < 0 || fpart_(intery) < 0)
+            printf("%f %f\n", rfpart_(intery), fpart_(intery));*/
+            intery += gradient;
+        }
+    } else {
+        if ( y2 < y1 ) {
+            swap(x1, x2);
+            swap(y1, y2);
+        }
+        gradient = dx / dy;
+        yend = round_(y1);
+        xend = x1 + gradient*(yend - y1);
+        ygap = rfpart_(y1 + 0.5);
+        ypxl1 = yend;
+        xpxl1 = ipart_(xend);
+        plot_(xpxl1, ypxl1, rfpart_(xend)*ygap);
+        plot_(xpxl1, ypxl1+1, fpart_(xend)*ygap);
+        interx = xend + gradient;
+
+        yend = round_(y2);
+        xend = x2 + gradient*(yend - y2);
+        ygap = fpart_(y2+0.5);
+        ypxl2 = yend;
+        xpxl2 = ipart_(xend);
+        plot_(xpxl2, ypxl2, rfpart_(xend) * ygap);
+        plot_(xpxl2, ypxl2 + 1, fpart_(xend) * ygap);
+
+        for(y=ypxl1+1; y <= (ypxl2-1); y++) {
+            plot_(ipart_(interx), y, rfpart_(interx));
+            plot_(ipart_(interx) + 1, y, fpart_(interx));
+            interx += gradient;
+        }
+    }
+}
+#undef plot_
+#undef ipart_
+#undef fpart_
+#undef round_
+#undef rfpart_
+
+#else
+
+static
+void draw_line ( struct state* st, int x0, int y0, int x1, int y1, int color, float a ) {
+    register int steep;
+    register int deltax;
+    register int deltay;
+    register int error;
+    register int ystep;
+    register int y;
+    register int x;
+
+
+    steep = abs ( y1 - y0 ) > abs ( x1 - x0 );
+    if ( steep ) { swap(x0,y0); swap(x1,y1); }
+    if ( x0 > x1 ) { swap(x0,x1); swap(y0,y1); }
+    deltax = x1 - x0;
+    deltay = abs(y1-y0);
+    error = 0;
+    y = y0;
+    ystep = y0 < y1 ? 1 : -1;
+    if ( a > 1.0f ) a = 1.0f;
+
+    for ( x = x0; x < x1; x++ ) {
+        if ( steep ) {
+            if ( ( y >= 0 && y < st->width ) && ( x >= 0 && x < st->height ) )
+                draw_point( st, y, x, color, a );
+        } else {
+            if ( ( x >= 0 && x < st->width ) && ( y >= 0 && y < st->height ) )
+                draw_point( st, x, y, color, a );
+        }
+        error += deltay;
+        if ( ( error << 1 ) > deltax ) {
+            y += ystep;
+            error -= deltax;
+        }
+    }
+}
+#endif
+
+static void create_buffers ( struct state* st, Display* display, Screen* screen, Window window, GC gc ) {
+    
+    XWindowAttributes xgwa;
+    XGetWindowAttributes( display, window, &xgwa );
+
+    /* Initialize the pixmap */
+    if ( st->buf != NULL ) XFreePixmap( display, st->pix );
+    
+    XSetForeground( display, gc, st->colors[BLACK] );
+    st->pix = XCreatePixmap( display, window, st->width, st->height,
+                             xgwa.depth );
+    XFillRectangle( display, st->pix, gc, 0, 0, st->width, st->height);
+
+    /* Initialize the bitmap */
+    if ( st->buf != NULL ) XDestroyImage ( st->buf );
+    st->buf = XGetImage( display, st->pix, 0, 0, st->width, st->height, visual_depth(screen, st->visual), ZPixmap );
+    st->buffer = (pixel_t*) calloc(sizeof(pixel_t), st->width * st->height);
+    /*int i;
+    for ( i = 0; i < st->width * st->height; ++i ) st->buffer[i] = st->colors[BLACK];*/
+}
+
+static void init_particle ( particle_t* p, float dx, float dy, float direction, int color, int max_age ) {
+    float max_initial_velocity = 2.0f;
+    p->x = -dx;
+    p->y = -dy;
+    p->xx = 0;
+    p->yy = 0;
+    p->vx = max_initial_velocity * cos(direction);
+    p->vy = max_initial_velocity * sin(direction);
+
+    p->age = random() % max_age;
+
+    p->color = color;
+}
+
+static void clamp ( int* value, int l, int h ) {
+    if ( *value < l ) *value = l;
+    if ( *value > h ) *value = h;
+}
+
+static pixel_t next_color ( struct state* st, pixel_t current ) {
+    int r=0, g=0, b=0;
+
+    point2rgb(st->depth, current, &r, &g, &b);
+    r += random() % 5 - 2;
+    g += random() % 5 - 2;
+    b += random() % 5 - 2;
+    clamp(&r, 0, 255);
+    clamp(&g, 0, 255);
+    clamp(&b, 0, 255);
+
+    return rgb2point( st->depth, r, g, b );
+}
+
+
+static void create_particles ( struct state* st ) {
+    int i;
+    float emitx, emity;
+    float direction;
+
+    for ( i = 0; i < st->particles_number; i++ ) {
+        emitx = ( st->ring_radius * sinf( M_PI * 2 * ( (float) i / st->particles_number ) ) );
+        emity = ( st->ring_radius * cosf( M_PI * 2 * ( (float) i / st->particles_number ) ) );
+        direction = (M_PI * i) / st->particles_number;
+
+        if ( st->epoch == WHITE && st->color )
+            st->colors[WHITE] = next_color(st, st->colors[WHITE]);
+
+        init_particle(st->particles + i, emitx, emity, direction, st->colors[WHITE], st->max_age);
+    }
+}
+
+
+/* randomly move one particle and draw it */
+static void move ( particle_t* p, struct state * st ) {
+    int w = st->width / 2;
+    int h = st->height / 2;
+    float max_dv = 1.0f;
+
+    p->xx = p->x;
+    p->yy = p->y;
+    p->x += p->vx;
+    p->y += p->vy;
+    p->vx += frand1() * st->curliness * max_dv;
+    p->vy += frand1() * st->curliness * max_dv;
+
+
+#if ANTIALIAS
+    draw_line_antialias( st,
+        w+p->xx, h+p->yy, w+p->x, h+p->y, p->color, 0.15 );
+    draw_line_antialias( st,
+        w-p->xx, h+p->yy, w-p->x, h+p->y, p->color, 0.15 );
+#else
+    draw_line( st, w+p->xx, h+p->yy, w+p->x, h+p->y, p->color, 0.15 );
+    draw_line( st, w-p->xx, h+p->yy, w-p->x, h+p->y, p->color, 0.15 );
+#endif
+
+    p->age++;
+    /* if this is too old, die and reborn */
+    if ( p->age > st->max_age ) {
+        float dir = frand1() * 2 * M_PI;
+        p->x = st->ring_radius * sin(dir);
+        p->y = st->ring_radius * cos(dir);
+        p->xx = p->yy = p->vx = p->vy = 0;
+        p->age = 0;
+
+        if ( st->epoch == WHITE && st->color )
+            st->colors[WHITE] = next_color(st, st->colors[WHITE] );
+        
+        p->color = st->colors[st->epoch];
+    }
+}
+
+
+
+
+/* Initialize Everything */
+static void* binaryring_init ( Display* display, Window window ) {
+    XWindowAttributes xgwa;
+
+    struct state *st = ( struct state* ) calloc ( 1, sizeof( *st ) );
+
+    XGetWindowAttributes( display, window, &xgwa );
+
+    st->epoch = WHITE;
+    st->display = display;
+    st->window = window;
+    st->particles_number = (get_integer_resource(st->display, "particles_number", "Integer"));
+    st->growth_delay = (get_integer_resource(st->display, "growth_delay", "Integer"));
+    st->ring_radius = (get_integer_resource(st->display, "ring_radius", "Integer"));
+    st->max_age = (get_integer_resource(st->display, "max_age", "Integer"));
+    st->color =  get_boolean_resource(st->display, "color", "Boolean");
+    st->height = xgwa.height;
+    st->width = xgwa.width;
+    st->visual = xgwa.visual;
+    st->curliness = 0.5;
+
+
+    st->depth = visual_depth(xgwa.screen, st->visual);
+    st->colors[0] = rgb2point(st->depth, 0, 0, 0);
+    st->colors[1] = rgb2point(st->depth, 255, 255, 255);
+
+    /*describe_visual (stdout, xgwa.screen, xgwa.visual, False);*/
+
+    st->particles = malloc (st->particles_number * sizeof( particle_t ) );
+    create_particles ( st );
+
+    st->gc = XCreateGC( st->display, st->window, 0, &st->gcv );
+    create_buffers ( st, display, xgwa.screen, window, st->gc );
+
+
+    return st;
+}
+
+
+static unsigned long binaryring_draw ( Display* display, Window win, void *closure ) {
+    struct state *st = (struct state *) closure;
+    int i;
+
+    for ( i = 0; i < st->particles_number; i++ )
+        move( &(st->particles[i]), st );
+
+    /* draw the XImage in the Pixmap and the put the Pixmap on the screen */
+    XPutImage( display, st->pix, st->gc, st->buf, 0, 0, 0, 0, st->width, st->height);
+    XCopyArea( display, st->pix, win, st->gc, 0, 0, st->width, st->height, 0, 0 );
+
+    /* randomly switch ageColor periods */
+    if ( random() % 10000 > 9950 ) 
+        st->epoch = (st->epoch == WHITE) ? BLACK : WHITE;
+
+    return st->growth_delay;
+}
+
+
+
+static void binaryring_reshape ( Display* display, Window win, void *closure, unsigned int w, unsigned int h ) {
+    struct state *st = (struct state *) closure;
+
+    XWindowAttributes tmp;
+    XGetWindowAttributes(display, win, &tmp);
+
+    if ( tmp.height != st->height || tmp.width != st->width ) {
+        st->height = tmp.height;
+        st->width = tmp.width;
+
+
+        st->epoch = WHITE;
+        create_particles ( st );
+
+        create_buffers ( st, display, tmp.screen, win, st->gc );
+    }
+}
+
+
+/* if someone press a key switch the color */
+static Bool binaryring_event ( Display* display, Window win, void *closure, XEvent* event ) {
+    struct state *st = (struct state *) closure;
+
+    if ( (*event).xany.type == KeyPress ) {
+        st->epoch = (st->epoch == WHITE) ? BLACK : WHITE;
+    }
+
+    return False;
+}
+
+
+/* delete everything */
+static void binaryring_free ( Display* display, Window win, void *closure ) {
+    struct state *st = (struct state *) closure;
+    XWindowAttributes tmp;
+    XGetWindowAttributes(display, win, &tmp);
+
+    free( st->buffer );
+    free( st->particles );
+
+    free ( st );
+}
+
+
+/* Default resources of the program */
+static const char* binaryring_defaults [] = {
+    ".background:	black",
+    ".foreground:	white",
+    "*growth_delay:     10000",
+    "*particles_number: 5000",
+    "*ring_radius:      40",
+    "*max_age:          400",
+    "*color:            True",
+    "*ignoreRotation:   True",
+    0
+};
+
+static XrmOptionDescRec binaryring_options [] = {
+    { "-particles-number", ".particles_number", XrmoptionSepArg, 0 },
+    { "-growth-delay",     ".growth_delay",     XrmoptionSepArg, 0 },
+    { "-ring-radius",      ".ring_radius",      XrmoptionSepArg, 0 },
+    { "-max-age",          ".max_age",          XrmoptionSepArg, 0 },
+    { "-color",            ".color",            XrmoptionNoArg,  "True"  },
+    { "-no-color",         ".color",            XrmoptionNoArg,  "False" },
+    { 0, 0, 0, 0}
+};
+
+XSCREENSAVER_MODULE("BinaryRing", binaryring)