Add drop shadows.

This commit is contained in:
Keith Packard 2003-11-10 01:32:01 +00:00
parent 67810f32f4
commit d98b963d75
3 changed files with 308 additions and 19 deletions

7
ChangeLog Normal file
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@ -0,0 +1,7 @@
2003-11-09 Keith Packard <keithp@keithp.com>
* Makefile:
* xcompmgr.c: (gaussian), (make_gaussian_map), (sum_gaussian),
(make_shadow), (shadow_picture), (win_extents), (paint_all),
(map_win), (unmap_win), (add_win), (configure_win), (main):
Add drop shadows.

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@ -1,4 +1,4 @@
LIBS=`pkg-config --cflags --libs xcomposite xfixes xdamage xrender`
LIBS=`pkg-config --cflags --libs xcomposite xfixes xdamage xrender` -lm
xcompmgr: xcompmgr.c
$(CC) -o $@ $(CFLAGS) xcompmgr.c $(LIBS)

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