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vnc: add a way to get the update frequency for a given region

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This patch compute the update frequency (in Hz) for each 64x64 rects.
Any adaptive encoding can get this value using vnc_update_freq(), and
switch to a lossy encoding if the value is too high.

The frequency is pre-calculated every 500ms, based on the last 10
updates per 64x64 rect.

If a 64x64 rect was not updated in the last 2 second, then the frequency
became 0, and all the stored timestamp are reseted.

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Corentin Chary 2011-02-04 09:05:55 +01:00 • committed by Anthony Liguori
parent b31f519e27
commit 999342a0fe
2 changed files with 120 additions and 0 deletions
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19
ui/vnc.h
View file

@ -80,6 +80,10 @@ typedef void VncSendHextileTile(VncState *vs,
#define VNC_MAX_HEIGHT 2048
#define VNC_DIRTY_WORDS (VNC_MAX_WIDTH / (16 * 32))
#define VNC_STAT_RECT 64
#define VNC_STAT_COLS (VNC_MAX_WIDTH / VNC_STAT_RECT)
#define VNC_STAT_ROWS (VNC_MAX_HEIGHT / VNC_STAT_RECT)
#define VNC_AUTH_CHALLENGE_SIZE 16
typedef struct VncDisplay VncDisplay;
@ -92,9 +96,23 @@ typedef struct VncDisplay VncDisplay;
#include "vnc-auth-sasl.h"
#endif
struct VncRectStat
{
/* time of last 10 updates, to find update frequency */
struct timeval times[10];
int idx;
double freq; /* Update frequency (in Hz) */
bool updated; /* Already updated during this refresh */
};
typedef struct VncRectStat VncRectStat;
struct VncSurface
{
struct timeval last_freq_check;
uint32_t dirty[VNC_MAX_HEIGHT][VNC_DIRTY_WORDS];
VncRectStat stats[VNC_STAT_ROWS][VNC_STAT_COLS];
DisplaySurface *ds;
};
@ -479,6 +497,7 @@ void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
int32_t encoding);
void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v);
double vnc_update_freq(VncState *vs, int x, int y, int w, int h);
/* Encodings */
int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);