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GUAC-240: Flush to JPEG if dirty rect is hot.

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This commit is contained in:
Michael Jumper 2015-08-17 01:34:32 -07:00
parent 26f9070d99
commit baf01d5524
1 changed files with 54 additions and 5 deletions
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57
src/common/guac_surface.c
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@ -261,7 +261,6 @@ static void __guac_common_mark_dirty(guac_common_surface* surface, const guac_co
}
#if 0
/**
* Calculate the current average refresh frequency for a given area on the
* surface.
@ -335,7 +334,6 @@ static unsigned int __guac_common_surface_calculate_framerate(
return 0;
}
#endif
/**
* Touch the heat map with this update rectangle, so that the update
@ -1148,6 +1146,43 @@ static void __guac_common_surface_flush_to_png(guac_common_surface* surface) {
}
/**
* Flushes the bitmap update currently described by the dirty rectangle within
* the given surface directly via an "img" instruction as JPEG data. The
* resulting instructions will be sent over the socket associated with the
* given surface.
*
* @param surface
* The surface to flush.
*/
static void __guac_common_surface_flush_to_jpeg(guac_common_surface* surface) {
if (surface->dirty) {
guac_socket* socket = surface->socket;
const guac_layer* layer = surface->layer;
/* Get Cairo surface for specified rect */
unsigned char* buffer = surface->buffer + surface->dirty_rect.y * surface->stride + surface->dirty_rect.x * 4;
cairo_surface_t* rect = cairo_image_surface_create_for_data(buffer, CAIRO_FORMAT_RGB24,
surface->dirty_rect.width,
surface->dirty_rect.height,
surface->stride);
/* Send JPEG for rect */
guac_client_stream_jpeg(surface->client, socket, GUAC_COMP_OVER, layer,
surface->dirty_rect.x, surface->dirty_rect.y, rect,
GUAC_SURFACE_JPEG_IMAGE_QUALITY);
cairo_surface_destroy(rect);
surface->realized = 1;
/* Surface is no longer dirty */
surface->dirty = 0;
}
}
/**
* Comparator for instances of guac_common_surface_bitmap_rect, the elements
* which make up a surface's bitmap buffer.
@ -1225,9 +1260,23 @@ void guac_common_surface_flush(guac_common_surface* surface) {
__guac_common_surface_flush_to_queue(surface);
/* Flush as bitmap otherwise */
else {
if (surface->dirty) flushed++;
else if (surface->dirty) {
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)
__guac_common_surface_flush_to_jpeg(surface);
/* Otherwise, use PNG */
else
__guac_common_surface_flush_to_png(surface);
}
}