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GUAC-240: Move JPEG optimality test into own function.

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This commit is contained in:
Michael Jumper 2015-08-17 01:44:31 -07:00
parent baf01d5524
commit dd2e020351
1 changed files with 29 additions and 8 deletions
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37
src/common/guac_surface.c
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@ -284,7 +284,7 @@ static void __guac_common_mark_dirty(guac_common_surface* surface, const guac_co
* The average refresh frequency.
*/
static unsigned int __guac_common_surface_calculate_framerate(
guac_common_surface* surface, guac_common_rect* rect) {
guac_common_surface* surface, const guac_common_rect* rect) {
int x, y;
@ -335,6 +335,31 @@ static unsigned int __guac_common_surface_calculate_framerate(
}
/**
* Returns whether the given rectangle would be optimally encoded as JPEG
* rather than PNG.
*
* @param surface
* The surface to be queried.
*
* @param rect
* The rectangle to check.
*
* @return
* Non-zero if the rectangle would be optimally encoded as JPEG, zero
* otherwise.
*/
static int __guac_common_surface_should_use_jpeg(guac_common_surface* surface,
const guac_common_rect* rect) {
/* Calculate the average framerate for the given rect */
int framerate = __guac_common_surface_calculate_framerate(surface, rect);
/* JPEG is preferred if rect is hot and smooth */
return framerate >= GUAC_COMMON_SURFACE_LOSSY_REFRESH_FREQUENCY;
}
/**
* Touch the heat map with this update rectangle, so that the update
* frequency can be calculated later.
@ -1264,13 +1289,9 @@ void guac_common_surface_flush(guac_common_surface* surface) {
flushed++;
/* Calculate the average framerate for the dirty rect */
int framerate =
__guac_common_surface_calculate_framerate(surface,
&surface->dirty_rect);
/* If this rectangle is hot, flush as JPEG */
if (framerate >= GUAC_COMMON_SURFACE_LOSSY_REFRESH_FREQUENCY)
/* Flush as JPEG if JPEG is preferred */
if (__guac_common_surface_should_use_jpeg(surface,
&surface->dirty_rect))
__guac_common_surface_flush_to_jpeg(surface);
/* Otherwise, use PNG */