Add drop shadows.
This commit is contained in:
Keith Packard
parent
67810f32f4
commit
d98b963d75
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@ -0,0 +1,7 @@
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2003-11-09 Keith Packard <keithp@keithp.com>
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* Makefile:
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* xcompmgr.c: (gaussian), (make_gaussian_map), (sum_gaussian),
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(make_shadow), (shadow_picture), (win_extents), (paint_all),
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(map_win), (unmap_win), (add_win), (configure_win), (main):
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Add drop shadows.
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2
Makefile
2
Makefile
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@ -1,4 +1,4 @@
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LIBS=`pkg-config --cflags --libs xcomposite xfixes xdamage xrender`
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LIBS=`pkg-config --cflags --libs xcomposite xfixes xdamage xrender` -lm
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xcompmgr: xcompmgr.c
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$(CC) -o $@ $(CFLAGS) xcompmgr.c $(LIBS)
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314
xcompmgr.c
314
xcompmgr.c
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@ -1,6 +1,8 @@
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#include <X11/extensions/Xcomposite.h>
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#include <X11/extensions/Xdamage.h>
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#include <X11/extensions/Xrender.h>
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@ -14,6 +16,12 @@ typedef struct _win {
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Damage damage;
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Picture picture;
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XserverRegion borderSize;
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XserverRegion extents;
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Picture shadow;
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int shadow_dx;
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int shadow_dy;
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int shadow_width;
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int shadow_height;
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/* for drawing translucent windows */
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XserverRegion borderClip;
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@ -32,6 +40,239 @@ XserverRegion allDamage;
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#define WINDOW_PLAIN 0
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#define WINDOW_DROP 1
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#define WINDOW_TRANS 2
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#define TRANS_OPACITY 0.75
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#define SHADOW_RADIUS 15
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#define SHADOW_OPACITY 0.75
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#define SHADOW_OFFSET_X (-SHADOW_RADIUS)
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#define SHADOW_OFFSET_Y (-SHADOW_RADIUS)
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double
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gaussian (double r, double x, double y)
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{
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return ((1 / (sqrt (2 * M_PI * r))) *
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exp ((- (x * x + y * y)) / (2 * r * r)));
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}
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typedef struct _conv {
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int size;
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double *data;
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} conv;
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conv *
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make_gaussian_map (Display *dpy, double r)
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{
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conv *c;
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int size = ((int) ceil ((r * 3)) + 1) & ~1;
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int center = size / 2;
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int x, y;
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double t;
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double g;
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c = malloc (sizeof (conv) + size * size * sizeof (double));
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c->size = size;
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c->data = (double *) (c + 1);
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for (y = 0; y < size; y++)
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for (x = 0; x < size; x++)
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{
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g = gaussian (r, (double) (x - center), (double) (y - center));
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t += g;
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c->data[y * size + x] = g;
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}
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printf ("gaussian total %f\n", t);
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for (y = 0; y < size; y++)
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for (x = 0; x < size; x++)
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{
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c->data[y*size + x] /= t;
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}
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return c;
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}
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/*
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* A picture will help
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*
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* -center 0 width width+center
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* -center +-----+-------------------+-----+
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* | | | |
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* | | | |
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* 0 +-----+-------------------+-----+
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* | | | |
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* | | | |
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* | | | |
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* height +-----+-------------------+-----+
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* | | | |
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* height+ | | | |
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* center +-----+-------------------+-----+
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*/
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unsigned int
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sum_gaussian (conv *map, double opacity, int x, int y, int width, int height)
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{
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int fx, fy;
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int sx, sy;
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double *g_data;
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double *g_line = map->data;
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int g_size = map->size;
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int center = g_size / 2;
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int fx_start, fx_end;
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int fy_start, fy_end;
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double v;
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/*
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* Compute set of filter values which are "in range",
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* that's the set with:
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* 0 <= x + (fx-center) && x + (fx-center) < width &&
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* 0 <= y + (fy-center) && y + (fy-center) < height
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*
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* 0 <= x + (fx - center) x + fx - center < width
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* center - x <= fx fx < width + center - x
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*/
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fx_start = center - x;
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if (fx_start < 0)
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fx_start = 0;
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fx_end = width + center - x;
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if (fx_end > g_size)
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fx_end = g_size;
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fy_start = center - y;
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if (fy_start < 0)
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fy_start = 0;
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fy_end = height + center - y;
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if (fy_end > g_size)
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fy_end = g_size;
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g_line = g_line + fy_start * g_size + fx_start;
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v = 0;
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for (fy = fy_start; fy < fy_end; fy++)
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{
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g_data = g_line;
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g_line += g_size;
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for (fx = fx_start; fx < fx_end; fx++)
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v += *g_data++;
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}
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if (v > 1)
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v = 1;
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return ((unsigned int) (v * opacity * 255.0)) << 24;
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}
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XImage *
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make_shadow (Display *dpy, double opacity, double r, int width, int height)
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{
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conv *map = make_gaussian_map (dpy, r);
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XImage *ximage;
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double *gdata = map->data;
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unsigned int *data;
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int gsize = map->size;
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int ylimit, xlimit;
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int swidth = width + gsize;
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int sheight = height + gsize;
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int center = gsize / 2;
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int x, y;
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int fx, fy;
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int sx, sy;
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unsigned int d;
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double v;
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unsigned char c;
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data = malloc (swidth * sheight * sizeof (int));
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ximage = XCreateImage (dpy,
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DefaultVisual(dpy, DefaultScreen(dpy)),
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32,
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ZPixmap,
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0,
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(char *) data,
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swidth, sheight, 32, swidth * sizeof (int));
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/*
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* Build the gaussian in sections
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*/
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/*
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* corners
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*/
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ylimit = gsize;
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if (ylimit > sheight / 2)
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ylimit = (sheight + 1) / 2;
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xlimit = gsize;
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if (xlimit > swidth / 2)
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xlimit = (swidth + 1) / 2;
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for (y = 0; y < ylimit; y++)
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for (x = 0; x < xlimit; x++)
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{
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d = sum_gaussian (map, opacity, x - center, y - center, width, height);
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data[y * swidth + x] = d;
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data[(sheight - y - 1) * swidth + x] = d;
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data[(sheight - y - 1) * swidth + (swidth - x - 1)] = d;
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data[y * swidth + (swidth - x - 1)] = d;
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}
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/*
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* top/bottom
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*/
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for (y = 0; y < ylimit; y++)
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{
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d = sum_gaussian (map, opacity, center, y - center, width, height);
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for (x = gsize; x < swidth - gsize; x++)
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{
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data[y * swidth + x] = d;
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data[(sheight - y - 1) * swidth + x] = d;
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}
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}
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/*
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* sides
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*/
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for (x = 0; x < xlimit; x++)
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{
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d = sum_gaussian (map, opacity, x - center, center, width, height);
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for (y = gsize; y < sheight - gsize; y++)
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{
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data[y * swidth + x] = d;
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data[y * swidth + (swidth - x - 1)] = d;
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}
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}
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/*
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* center
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*/
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d = sum_gaussian (map, opacity, center, center, width, height);
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for (y = ylimit; y < sheight - ylimit; y++)
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for (x = xlimit; x < swidth - xlimit; x++)
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data[y * swidth + x] = d;
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free (map);
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return ximage;
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}
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Picture
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shadow_picture (Display *dpy, double opacity, double r, int width, int height, int *wp, int *hp)
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{
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XImage *shadowImage = make_shadow (dpy, opacity, r, width, height);
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Pixmap shadowPixmap = XCreatePixmap (dpy, root,
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shadowImage->width,
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shadowImage->height,
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32);
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Picture shadowPicture = XRenderCreatePicture (dpy, shadowPixmap,
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XRenderFindStandardFormat (dpy, PictStandardARGB32),
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0, 0);
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GC gc = XCreateGC (dpy, shadowPixmap, 0, 0);
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XPutImage (dpy, shadowPixmap, gc, shadowImage, 0, 0, 0, 0,
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shadowImage->width,
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shadowImage->height);
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*wp = shadowImage->width;
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*hp = shadowImage->height;
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XFreeGC (dpy, gc);
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XDestroyImage (shadowImage);
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XFreePixmap (dpy, shadowPixmap);
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return shadowPicture;
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}
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win *
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find_win (Display *dpy, Window id)
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@ -55,6 +296,29 @@ paint_root (Display *dpy)
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0, 0, 32767, 32767);
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}
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XserverRegion
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win_extents (Display *dpy, win *w)
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{
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XRectangle r;
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if (!w->shadow)
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{
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double opacity = SHADOW_OPACITY;
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if (w->mode == WINDOW_TRANS)
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opacity = opacity * TRANS_OPACITY;
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w->shadow = shadow_picture (dpy, opacity, SHADOW_RADIUS,
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w->a.width, w->a.height,
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&w->shadow_width, &w->shadow_height);
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w->shadow_dx = SHADOW_OFFSET_X;
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w->shadow_dy = SHADOW_OFFSET_Y;
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}
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r.x = w->a.x + w->a.border_width + w->shadow_dx;
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r.y = w->a.y + w->a.border_width + w->shadow_dy;
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r.width = w->shadow_width;
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r.height = w->shadow_height;
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return XFixesCreateRegion (dpy, &r, 1);
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}
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XserverRegion
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border_size (Display *dpy, win *w)
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{
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@ -77,19 +341,15 @@ paint_all (Display *dpy, XserverRegion region)
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if (w->a.map_state != IsViewable)
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continue;
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if (w->mode == WINDOW_TRANS)
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{
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w->borderClip = XFixesCreateRegion (dpy, 0, 0);
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XFixesUnionRegion (dpy, w->borderClip, region, 0, 0, None, 0, 0);
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w->prev_trans = t;
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t = w;
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}
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else
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{
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XFixesSetPictureClipRegion (dpy, rootPicture, 0, 0, region);
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if (w->borderSize)
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XFixesDestroyRegion (dpy, w->borderSize);
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w->borderSize = border_size (dpy, w);
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if (w->extents)
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XFixesDestroyRegion (dpy, w->extents);
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w->extents = win_extents (dpy, w);
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if (w->mode != WINDOW_TRANS)
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{
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XFixesSetPictureClipRegion (dpy, rootPicture, 0, 0, region);
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XFixesSubtractRegion (dpy, region, region, 0, 0, w->borderSize, 0, 0);
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XRenderComposite (dpy, PictOpSrc, w->picture, None, rootPicture,
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0, 0, 0, 0,
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@ -98,12 +358,25 @@ paint_all (Display *dpy, XserverRegion region)
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w->a.width,
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w->a.height);
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}
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w->borderClip = XFixesCreateRegion (dpy, 0, 0);
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XFixesUnionRegion (dpy, w->borderClip, region, 0, 0, None, 0, 0);
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w->prev_trans = t;
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t = w;
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}
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XFixesSetPictureClipRegion (dpy, rootPicture, 0, 0, region);
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paint_root (dpy);
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for (w = t; w; w = w->prev_trans)
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{
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XFixesSetPictureClipRegion (dpy, rootPicture, 0, 0, w->borderClip);
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if (w->shadow)
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{
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XRenderComposite (dpy, PictOpOver, w->shadow, None, rootPicture,
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0, 0, 0, 0,
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w->a.x + w->a.border_width + w->shadow_dx,
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w->a.y + w->a.border_width + w->shadow_dy,
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w->shadow_width, w->shadow_height);
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}
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if (w->mode == WINDOW_TRANS)
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XRenderComposite (dpy, PictOpOver, w->picture, transPicture, rootPicture,
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0, 0, 0, 0,
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w->a.x + w->a.border_width,
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@ -154,7 +427,7 @@ map_win (Display *dpy, Window id)
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return;
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w->a.map_state = IsViewable;
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w->damage = XDamageCreate (dpy, id, XDamageReportNonEmpty);
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region = border_size (dpy, w);
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region = win_extents (dpy, w);
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add_damage (dpy, region);
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}
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@ -171,10 +444,10 @@ unmap_win (Display *dpy, Window id)
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XDamageDestroy (dpy, w->damage);
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w->damage = None;
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}
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if (w->borderSize != None)
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if (w->extents != None)
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{
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add_damage (dpy, w->borderSize); /* destroys region */
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w->borderSize = None;
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add_damage (dpy, w->extents); /* destroys region */
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w->extents = None;
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}
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}
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@ -211,7 +484,9 @@ add_win (Display *dpy, Window id, Window prev)
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CPSubwindowMode,
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&pa);
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new->shadow = None;
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new->borderSize = None;
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new->extents = None;
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if (new->a.override_redirect)
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new->mode = WINDOW_TRANS;
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else
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@ -234,11 +509,17 @@ configure_win (Display *dpy, XConfigureEvent *ce)
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if (w->a.map_state == IsViewable)
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{
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damage = XFixesCreateRegion (dpy, 0, 0);
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if (w->borderSize != None)
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XFixesUnionRegion (dpy, damage, w->borderSize, 0, 0, None, 0, 0);
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if (w->extents != None)
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XFixesUnionRegion (dpy, damage, w->extents, 0, 0, None, 0, 0);
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}
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w->a.x = ce->x;
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w->a.y = ce->y;
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if (w->a.width != ce->width || w->a.height != ce->height)
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if (w->shadow)
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{
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XRenderFreePicture (dpy, w->shadow);
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w->shadow = None;
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}
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w->a.width = ce->width;
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w->a.height = ce->height;
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w->a.border_width = ce->border_width;
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@ -345,6 +626,7 @@ main ()
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XRenderPictureAttributes pa;
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XRenderColor c;
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XRectangle *expose_rects = 0;
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GC gc;
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int size_expose = 0;
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int n_expose = 0;
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