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video: overlay-composition: some minor clean-ups

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extract_alpha and apply_global alpha always return TRUE really,
so just do away with the return value. Convert a g_return_if_fail()
into a g_assert(), since this is only to check internal consistency
and not a guard for public API. Add some locking.

https://bugzilla.gnome.org/show_bug.cgi?id=668483
This commit is contained in:
Tim-Philipp Müller 2012-03-24 19:47:10 +00:00
parent 9d1b331004
commit 32679e1826
1 changed files with 14 additions and 15 deletions
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29
gst-libs/gst/video/video-overlay-composition.c
View file

@ -941,7 +941,7 @@ gst_video_overlay_rectangle_unpremultiply (GstBlendVideoFormatInfo * info)
}
static gboolean
static void
gst_video_overlay_rectangle_extract_alpha (GstVideoOverlayRectangle * rect)
{
guint8 *src, *dst;
@ -954,30 +954,29 @@ gst_video_overlay_rectangle_extract_alpha (GstVideoOverlayRectangle * rect)
rect->initial_alpha = g_malloc (alpha_size);
src = GST_BUFFER_DATA (rect->pixels);
dst = rect->initial_alpha;
/* FIXME we're accessing possibly uninitialised bytes from the row padding */
while (offset < alpha_size) {
dst[offset] = src[offset * 4 + ARGB_A];
++offset;
}
return TRUE;
}
static gboolean
static void
gst_video_overlay_rectangle_apply_global_alpha (GstVideoOverlayRectangle * rect,
float global_alpha)
{
guint8 *src, *dst;
guint offset = 0;
g_return_val_if_fail (!(rect->applied_global_alpha != 1.0
&& rect->initial_alpha == NULL), FALSE);
g_assert (!(rect->applied_global_alpha != 1.0
&& rect->initial_alpha == NULL));
if (global_alpha == rect->applied_global_alpha)
return TRUE;
return;
if (rect->initial_alpha == NULL &&
!gst_video_overlay_rectangle_extract_alpha (rect))
return FALSE;
if (rect->initial_alpha == NULL)
gst_video_overlay_rectangle_extract_alpha (rect);
src = rect->initial_alpha;
rect->pixels = gst_buffer_make_writable (rect->pixels);
@ -1001,7 +1000,6 @@ gst_video_overlay_rectangle_apply_global_alpha (GstVideoOverlayRectangle * rect,
}
rect->applied_global_alpha = global_alpha;
return TRUE;
}
static GstBuffer *
@ -1112,17 +1110,18 @@ gst_video_overlay_rectangle_get_pixels_argb_internal (GstVideoOverlayRectangle *
GST_RECTANGLE_UNLOCK (rectangle);
done:
GST_RECTANGLE_LOCK (rectangle);
if (apply_global_alpha
&& scaled_rect->applied_global_alpha != rectangle->global_alpha) {
if (!gst_video_overlay_rectangle_apply_global_alpha (scaled_rect,
rectangle->global_alpha))
return NULL; /* return original data? */
gst_video_overlay_rectangle_apply_global_alpha (scaled_rect,
rectangle->global_alpha);
gst_video_overlay_rectangle_set_global_alpha (scaled_rect,
rectangle->global_alpha);
} else if (revert_global_alpha && scaled_rect->applied_global_alpha != 1.0) {
if (!gst_video_overlay_rectangle_apply_global_alpha (scaled_rect, 1.0))
return NULL; /* return original data? */
gst_video_overlay_rectangle_apply_global_alpha (scaled_rect, 1.0);
}
GST_RECTANGLE_UNLOCK (rectangle);
*stride = scaled_rect->stride;
return scaled_rect->pixels;