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kate: avoid rendering when we know there is nothing to render

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=660528
This commit is contained in:
Vincent Penquerc'h 2011-09-29 20:55:22 +01:00 committed by Sebastian Dröge
parent 12bb47343d
commit fa3d661083
1 changed files with 48 additions and 34 deletions
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82
ext/kate/gstkatetiger.c
View file

@ -725,6 +725,7 @@ gst_kate_tiger_video_chain (GstPad * pad, GstBuffer * buf)
GstFlowReturn rflow = GST_FLOW_OK; GstFlowReturn rflow = GST_FLOW_OK;
unsigned char *ptr; unsigned char *ptr;
int ret; int ret;
kate_float t;
GST_KATE_TIGER_MUTEX_LOCK (tiger); GST_KATE_TIGER_MUTEX_LOCK (tiger);
@ -743,45 +744,58 @@ gst_kate_tiger_video_chain (GstPad * pad, GstBuffer * buf)
g_cond_broadcast (tiger->cond); g_cond_broadcast (tiger->cond);
} }
/* draw on it */ /* Update first with a dummy buffer pointer we cannot write to. If there is nothing
to draw, we will not have to make it writeable */
ptr = GST_BUFFER_DATA (buf);
ret =
tiger_renderer_set_buffer (tiger->tr, ptr, tiger->video_width,
tiger->video_height, tiger->video_width * 4, tiger->swap_rgb);
if (G_UNLIKELY (ret < 0)) {
GST_WARNING_OBJECT (tiger,
"Tiger renderer failed to set buffer to video frame: %d", ret);
goto pass;
}
/* update the renderer at the time of the video frame */
t = gst_kate_tiger_get_time (tiger);
GST_LOG_OBJECT (tiger, "Video segment calc: last stop %ld, time %.3f",
(long) tiger->video_segment.last_stop, t);
ret = tiger_renderer_update (tiger->tr, t, 1);
if (G_UNLIKELY (ret < 0)) {
GST_WARNING_OBJECT (tiger, "Tiger renderer failed to update: %d", ret);
goto pass;
}
/* if there nothing to draw, we can just push the video buffer as is */
if (ret > 0)
goto pass;
/* there is something to draw, so first make the buffer writable */
buf = gst_buffer_make_writable (buf); buf = gst_buffer_make_writable (buf);
if (G_UNLIKELY (!buf)) { if (G_UNLIKELY (!buf)) {
GST_WARNING_OBJECT (tiger, "Failed to make video buffer writable"); GST_WARNING_OBJECT (tiger, "Failed to make video buffer writable");
} else { goto pass;
ptr = GST_BUFFER_DATA (buf);
if (!ptr) {
GST_WARNING_OBJECT (tiger,
"Failed to get a pointer to video buffer data");
} else {
ret =
tiger_renderer_set_buffer (tiger->tr, ptr, tiger->video_width,
tiger->video_height, tiger->video_width * 4, tiger->swap_rgb);
if (G_UNLIKELY (ret < 0)) {
GST_WARNING_OBJECT (tiger,
"Tiger renderer failed to set buffer to video frame: %d", ret);
} else {
kate_float t = gst_kate_tiger_get_time (tiger);
GST_LOG_OBJECT (tiger, "Video segment calc: last stop %ld, time %.3f",
(long) tiger->video_segment.last_stop, t);
ret = tiger_renderer_update (tiger->tr, t, 1);
if (G_UNLIKELY (ret < 0)) {
GST_WARNING_OBJECT (tiger, "Tiger renderer failed to update: %d",
ret);
} else {
ret = tiger_renderer_render (tiger->tr);
if (G_UNLIKELY (ret < 0)) {
GST_WARNING_OBJECT (tiger,
"Tiger renderer failed to render to video frame: %d", ret);
} else {
GST_LOG_OBJECT (tiger,
"Tiger renderer rendered on video frame at %f", t);
}
}
}
}
} }
/* and setup that buffer before rendering */
ptr = GST_BUFFER_DATA (buf);
ret =
tiger_renderer_set_buffer (tiger->tr, ptr, tiger->video_width,
tiger->video_height, tiger->video_width * 4, tiger->swap_rgb);
if (G_UNLIKELY (ret < 0)) {
GST_WARNING_OBJECT (tiger,
"Tiger renderer failed to set buffer to video frame: %d", ret);
goto pass;
}
ret = tiger_renderer_render (tiger->tr);
if (G_UNLIKELY (ret < 0)) {
GST_WARNING_OBJECT (tiger,
"Tiger renderer failed to render to video frame: %d", ret);
} else {
GST_LOG_OBJECT (tiger, "Tiger renderer rendered on video frame at %f", t);
}
pass:
GST_KATE_TIGER_MUTEX_UNLOCK (tiger); GST_KATE_TIGER_MUTEX_UNLOCK (tiger);
rflow = gst_pad_push (tiger->srcpad, buf); rflow = gst_pad_push (tiger->srcpad, buf);