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#include <stdio.h>
#include <stdint.h>
#include <sched.h>
#include <unistd.h>
#include <string.h>
#include <sys/time.h>
#include <stdlib.h>
#include <cairo.h>
#include <cairo-xlib-xrender.h>
#include "tools.h"
/**
* Set this to 1 to use realtime priority. Dangerous! This will hang your
* machine for the duration of the test! Infinite loop and you must reboot!
*/
#define USE_REALTIME_PRIORITY 0
#define rdtscll(val) __asm__ __volatile__("rdtsc" : "=A" (val))
static int mhz_calculated = 0;
double mhz;
static double cpuinfo_get_speed( void )
{
uint64_t tsc_start, tsc_end;
struct timeval tv_start, tv_end;
int usec_delay;
rdtscll( tsc_start );
gettimeofday( &tv_start, 0 );
usleep( 100000 );
rdtscll( tsc_end );
gettimeofday( &tv_end, 0 );
usec_delay = 1000000 * (tv_end.tv_sec - tv_start.tv_sec) +
(tv_end.tv_usec - tv_start.tv_usec);
return (((double) (tsc_end - tsc_start)) / ((double) usec_delay));
}
int set_realtime_priority( int max )
{
struct sched_param schp;
memset( &schp, 0, sizeof( schp ) );
if( max ) schp.sched_priority = sched_get_priority_max( SCHED_FIFO );
else schp.sched_priority = sched_get_priority_max( SCHED_FIFO ) - 1;
if( sched_setscheduler( 0, SCHED_FIFO, &schp ) != 0 ) {
return 0;
}
return 1;
}
double get_milliseconds( int cycles )
{
if( !mhz_calculated ) {
mhz = cpuinfo_get_speed();
mhz_calculated = 1;
}
return ((double) cycles) / (mhz * 1000.0);
}
static Display *dpy;
static Pixmap pixmap;
static int xlib = 0;
static cairo_surface_t *create_xlib_surface (int width, int height)
{
cairo_surface_t *surface;
XRenderPictFormat *xrender_format;
dpy = XOpenDisplay (0);
xrender_format = XRenderFindStandardFormat (dpy, PictStandardARGB32);
pixmap = XCreatePixmap (dpy, DefaultRootWindow (dpy),
width, height, xrender_format->depth);
surface = cairo_xlib_surface_create_with_xrender_format (dpy, pixmap,
DefaultScreenOfDisplay (dpy), xrender_format, width, height);
return surface;
}
static void cleanup_xlib (void)
{
XFreePixmap (dpy, pixmap);
XCloseDisplay (dpy);
}
static uint8_t *data = 0;
cairo_surface_t *output_create_surface (const char *appname, int width,
int height)
{
if (USE_REALTIME_PRIORITY) {
if (!set_realtime_priority (0)) {
fprintf (stderr, "Cannot set realtime priority (need root)\n");
}
}
if (strstr (appname, "xlib")) {
return create_xlib_surface (width, height);
} else {
data = malloc (width * height * 4);
return cairo_image_surface_create_for_data (data, CAIRO_FORMAT_ARGB32,
width, height, width * 4);
}
}
void output_cleanup (void)
{
if (xlib) {
cleanup_xlib ();
} else {
free (data);
}
}
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