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mutter-performance-source/src/compositor/shadow.c
Owen W. Taylor f0d22e18c4 Split shadow code into a separate file 
Separate code related to creating the gaussian-blurred shadow texture
into a separate file.

Move the definition of MetaCompositor into a compositor-private.h
so that the shadow code can cache the source in the compositor
structure.

http://bugzilla.gnome.org/show_bug.cgi?id=587251
2009-07-05 23:28:38 +01:00

350 lines
8.7 KiB
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
#define _GNU_SOURCE /* For M_PI */
#include <math.h>
#include "compositor-private.h"
#include "shadow.h"
#include "tidy/tidy-texture-frame.h"
#define SHADOW_RADIUS 8
#define SHADOW_OPACITY 0.9
#define SHADOW_OFFSET_X (SHADOW_RADIUS)
#define SHADOW_OFFSET_Y (SHADOW_RADIUS)
#define MAX_TILE_SZ 8 /* Must be <= shaddow radius */
#define TILE_WIDTH (3*MAX_TILE_SZ)
#define TILE_HEIGHT (3*MAX_TILE_SZ)
static unsigned char* shadow_gaussian_make_tile (void);
ClutterActor *
mutter_create_shadow_frame (MetaCompositor *compositor)
{
ClutterActor *frame;
if (!compositor->shadow_src)
{
guchar *data;
data = shadow_gaussian_make_tile ();
compositor->shadow_src = clutter_texture_new ();
clutter_texture_set_from_rgb_data (CLUTTER_TEXTURE (compositor->shadow_src),
data,
TRUE,
TILE_WIDTH,
TILE_HEIGHT,
TILE_WIDTH*4,
4,
0,
NULL);
g_free (data);
}
frame = tidy_texture_frame_new (CLUTTER_TEXTURE (compositor->shadow_src),
MAX_TILE_SZ,
MAX_TILE_SZ,
MAX_TILE_SZ,
MAX_TILE_SZ);
clutter_actor_set_position (frame,
SHADOW_OFFSET_X , SHADOW_OFFSET_Y);
return frame;
}
typedef struct GaussianMap
{
int size;
double * data;
} GaussianMap;
static double
gaussian (double r, double x, double y)
{
return ((1 / (sqrt (2 * M_PI * r))) *
exp ((- (x * x + y * y)) / (2 * r * r)));
}
static GaussianMap *
make_gaussian_map (double r)
{
GaussianMap *c;
int size = ((int) ceil ((r * 3)) + 1) & ~1;
int center = size / 2;
int x, y;
double t = 0.0;
double g;
c = g_malloc (sizeof (GaussianMap) + 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;
}
for (y = 0; y < size; y++)
for (x = 0; x < size; x++)
c->data[y*size + x] /= t;
return c;
}
static unsigned char
sum_gaussian (GaussianMap * map, double opacity,
int x, int y, int width, int height)
{
int fx, fy;
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;
unsigned int r;
/*
* 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;
v *= (opacity * 255.0);
r = (unsigned int) v;
return (unsigned char) r;
}
static unsigned char *
shadow_gaussian_make_tile ()
{
unsigned char * data;
int size;
int center;
int x, y;
unsigned char d;
int pwidth, pheight;
double opacity = SHADOW_OPACITY;
static GaussianMap * gaussian_map = NULL;
struct _mypixel
{
unsigned char r;
unsigned char g;
unsigned char b;
unsigned char a;
} * _d;
if (!gaussian_map)
gaussian_map =
make_gaussian_map (SHADOW_RADIUS);
size = gaussian_map->size;
center = size / 2;
/* Top & bottom */
pwidth = MAX_TILE_SZ;
pheight = MAX_TILE_SZ;
data = g_malloc0 (4 * TILE_WIDTH * TILE_HEIGHT);
_d = (struct _mypixel*) data;
/* N */
for (y = 0; y < pheight; y++)
{
d = sum_gaussian (gaussian_map, opacity,
center, y - center,
TILE_WIDTH, TILE_HEIGHT);
for (x = 0; x < pwidth; x++)
{
_d[y*3*pwidth + x + pwidth].r = 0;
_d[y*3*pwidth + x + pwidth].g = 0;
_d[y*3*pwidth + x + pwidth].b = 0;
_d[y*3*pwidth + x + pwidth].a = d;
}
}
/* S */
pwidth = MAX_TILE_SZ;
pheight = MAX_TILE_SZ;
for (y = 0; y < pheight; y++)
{
d = sum_gaussian (gaussian_map, opacity,
center, y - center,
TILE_WIDTH, TILE_HEIGHT);
for (x = 0; x < pwidth; x++)
{
_d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x + pwidth].r = 0;
_d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x + pwidth].g = 0;
_d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x + pwidth].b = 0;
_d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x + pwidth].a = d;
}
}
/* w */
pwidth = MAX_TILE_SZ;
pheight = MAX_TILE_SZ;
for (x = 0; x < pwidth; x++)
{
d = sum_gaussian (gaussian_map, opacity,
x - center, center,
TILE_WIDTH, TILE_HEIGHT);
for (y = 0; y < pheight; y++)
{
_d[y*3*pwidth + 3*pwidth*pheight + x].r = 0;
_d[y*3*pwidth + 3*pwidth*pheight + x].g = 0;
_d[y*3*pwidth + 3*pwidth*pheight + x].b = 0;
_d[y*3*pwidth + 3*pwidth*pheight + x].a = d;
}
}
/* E */
for (x = 0; x < pwidth; x++)
{
d = sum_gaussian (gaussian_map, opacity,
x - center, center,
TILE_WIDTH, TILE_HEIGHT);
for (y = 0; y < pheight; y++)
{
_d[y*3*pwidth + 3*pwidth*pheight + (pwidth-x-1) + 2*pwidth].r = 0;
_d[y*3*pwidth + 3*pwidth*pheight + (pwidth-x-1) + 2*pwidth].g = 0;
_d[y*3*pwidth + 3*pwidth*pheight + (pwidth-x-1) + 2*pwidth].b = 0;
_d[y*3*pwidth + 3*pwidth*pheight + (pwidth-x-1) + 2*pwidth].a = d;
}
}
/* NW */
pwidth = MAX_TILE_SZ;
pheight = MAX_TILE_SZ;
for (x = 0; x < pwidth; x++)
for (y = 0; y < pheight; y++)
{
d = sum_gaussian (gaussian_map, opacity,
x-center, y-center,
TILE_WIDTH, TILE_HEIGHT);
_d[y*3*pwidth + x].r = 0;
_d[y*3*pwidth + x].g = 0;
_d[y*3*pwidth + x].b = 0;
_d[y*3*pwidth + x].a = d;
}
/* SW */
for (x = 0; x < pwidth; x++)
for (y = 0; y < pheight; y++)
{
d = sum_gaussian (gaussian_map, opacity,
x-center, y-center,
TILE_WIDTH, TILE_HEIGHT);
_d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x].r = 0;
_d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x].g = 0;
_d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x].b = 0;
_d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + x].a = d;
}
/* SE */
for (x = 0; x < pwidth; x++)
for (y = 0; y < pheight; y++)
{
d = sum_gaussian (gaussian_map, opacity,
x-center, y-center,
TILE_WIDTH, TILE_HEIGHT);
_d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + (pwidth-x-1) +
2*pwidth].r = 0;
_d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + (pwidth-x-1) +
2*pwidth].g = 0;
_d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + (pwidth-x-1) +
2*pwidth].b = 0;
_d[(pheight-y-1)*3*pwidth + 6*pwidth*pheight + (pwidth-x-1) +
2*pwidth].a = d;
}
/* NE */
for (x = 0; x < pwidth; x++)
for (y = 0; y < pheight; y++)
{
d = sum_gaussian (gaussian_map, opacity,
x-center, y-center,
TILE_WIDTH, TILE_HEIGHT);
_d[y*3*pwidth + (pwidth - x - 1) + 2*pwidth].r = 0;
_d[y*3*pwidth + (pwidth - x - 1) + 2*pwidth].g = 0;
_d[y*3*pwidth + (pwidth - x - 1) + 2*pwidth].b = 0;
_d[y*3*pwidth + (pwidth - x - 1) + 2*pwidth].a = d;
}
/* center */
pwidth = MAX_TILE_SZ;
pheight = MAX_TILE_SZ;
d = sum_gaussian (gaussian_map, opacity,
center, center, TILE_WIDTH, TILE_HEIGHT);
for (x = 0; x < pwidth; x++)
for (y = 0; y < pheight; y++)
{
_d[y*3*pwidth + 3*pwidth*pheight + x + pwidth].r = 0;
_d[y*3*pwidth + 3*pwidth*pheight + x + pwidth].g = 0;
_d[y*3*pwidth + 3*pwidth*pheight + x + pwidth].b = 0;
_d[y*3*pwidth + 3*pwidth*pheight + x + pwidth].a = 0;
}
return data;
}
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