[Git][freetype/freetype-demos][master] [ftbench] Add Windows performance timers.

[Alexei Podtelezhnikov]

Alexei Podtelezhnikov pushed to branch master at FreeType / FreeType Demo Programs

Commits:

• 8b0c22c5
  by Alexei Podtelezhnikov at 2021-03-18T22:49:00-04:00

  [ftbench] Add Windows performance timers.
  
  * src/ftbench.c (get_time) [_WIN32]: Add QPC, GPT, and QPCT timing tools.
  (main) [_WIN32]: Initialize interval for QPC.
  

2 changed files:

• ChangeLog
• src/ftbench.c

Changes:

ChangeLog

---

	1	+2021-03-18 Alexei Podtelezhnikov <apodtele@gmail.com>
	2	+
	3	+ [ftbench] Add Windows performance timers.
	4	+
	5	+ * src/ftbench.c (get_time) [_WIN32]: Add QPC, GPT, and QPCT timing
	6	+ tools.
	7	+ (main) [_WIN32]: Initialize interval for QPC.
	8	+
1	9	2021-02-28 Alexei Podtelezhnikov <apodtele@gmail.com>
2	10
3	11	[graph/x11] Gray multiplication tricks.

src/ftbench.c

---

...	...	@@ -43,6 +43,20 @@
43	43
44	44	#include "common.h"
45	45
	46	+#ifdef _WIN32
	47	+#define WIN32_LEAN_AND_MEAN
	48	+#include <windows.h>
	49	+
	50	+/* Specify the timer: QPC for accurate wall time, GPT for user-mode time. */
	51	+/* Otherwise, QPCT cycles are measured accurately but with huge overhead. */
	52	+#define QPC
	53	+
	54	+#ifdef QPC
	55	+ double interval;
	56	+#endif
	57	+
	58	+#endif
	59	+
46	60
47	61	typedef struct btimer_t_ {
48	62	double t0;
...	...	@@ -195,6 +209,35 @@
195	209	#endif /* _POSIX_CPUTIME */
196	210
197	211	return 1E6 * (double)tv.tv_sec + 1E-3 * (double)tv.tv_nsec;
	212	+
	213	+#elif defined _WIN32
	214	+
	215	+#ifdef QPC
	216	+ LARGE_INTEGER ticks;
	217	+
	218	+
	219	+ QueryPerformanceCounter( &ticks );
	220	+
	221	+ return interval * ticks.QuadPart;
	222	+
	223	+#elif defined GPT
	224	+ FILETIME start, end, kern, user;
	225	+
	226	+
	227	+ GetProcessTimes( GetCurrentProcess(), &start, &end, &kern, &user );
	228	+
	229	+ return 0.1 * user.dwLowDateTime + 429496729.6 * user.dwHighDateTime;
	230	+
	231	+#else
	232	+ ULONG64 cycles;
	233	+
	234	+
	235	+ QueryProcessCycleTime( GetCurrentProcess(), &cycles );
	236	+
	237	+ return 1e-3 * cycles; /* at 1GHz */
	238	+
	239	+#endif
	240	+
198	241	#else
199	242	/* clock() accuracy has improved since glibc 2.18 */
200	243	return 1E6 * (double)clock() / (double)CLOCKS_PER_SEC;
...	...	@@ -954,6 +997,13 @@
954	997	int version;
955	998	char *engine;
956	999
	1000	+#if defined _WIN32 && defined QPC
	1001	+ LARGE_INTEGER freq;
	1002	+
	1003	+ QueryPerformanceFrequency( &freq );
	1004	+ interval = 1e6 / freq.QuadPart;
	1005	+#endif
	1006	+
957	1007
958	1008	if ( FT_Init_FreeType( &lib ) )
959	1009	{

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