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basetextoverlay: Fix segfault when overlay outside the frame

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When the textoverlay is set outside the video frame by deltax or deltay the
calculation segfaults, but it is also  unnecessary since it doesn't need to be
displayed. So we should clip the text.

https://bugzilla.gnome.org/show_bug.cgi?id=738242
This commit is contained in:
Luis de Bethencourt 2014-10-10 10:05:19 +05:30
parent 57ac7b1800
commit 1cc311156c
1 changed files with 34 additions and 26 deletions
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60
ext/pango/gstbasetextoverlay.c
View file

@ -1364,34 +1364,42 @@ gst_base_text_overlay_get_pos (GstBaseTextOverlay * overlay,
*xpos = 0;
}
*xpos += overlay->deltax;
if (*xpos > overlay->width) {
/* Clip text if out of frame */
overlay->silent = TRUE;
} else {
if (overlay->use_vertical_render)
valign = GST_BASE_TEXT_OVERLAY_VALIGN_TOP;
else
valign = overlay->valign;
if (overlay->use_vertical_render)
valign = GST_BASE_TEXT_OVERLAY_VALIGN_TOP;
else
valign = overlay->valign;
switch (valign) {
case GST_BASE_TEXT_OVERLAY_VALIGN_BOTTOM:
*ypos = overlay->height - height - overlay->ypad;
break;
case GST_BASE_TEXT_OVERLAY_VALIGN_BASELINE:
*ypos = overlay->height - (height + overlay->ypad);
break;
case GST_BASE_TEXT_OVERLAY_VALIGN_TOP:
*ypos = overlay->ypad;
break;
case GST_BASE_TEXT_OVERLAY_VALIGN_POS:
*ypos = (gint) (overlay->height * overlay->ypos) - height / 2;
*ypos = CLAMP (*ypos, 0, overlay->height - height);
break;
case GST_BASE_TEXT_OVERLAY_VALIGN_CENTER:
*ypos = (overlay->height - height) / 2;
break;
default:
*ypos = overlay->ypad;
break;
switch (valign) {
case GST_BASE_TEXT_OVERLAY_VALIGN_BOTTOM:
*ypos = overlay->height - height - overlay->ypad;
break;
case GST_BASE_TEXT_OVERLAY_VALIGN_BASELINE:
*ypos = overlay->height - (height + overlay->ypad);
break;
case GST_BASE_TEXT_OVERLAY_VALIGN_TOP:
*ypos = overlay->ypad;
break;
case GST_BASE_TEXT_OVERLAY_VALIGN_POS:
*ypos = (gint) (overlay->height * overlay->ypos) - height / 2;
*ypos = CLAMP (*ypos, 0, overlay->height - height);
break;
case GST_BASE_TEXT_OVERLAY_VALIGN_CENTER:
*ypos = (overlay->height - height) / 2;
break;
default:
*ypos = overlay->ypad;
break;
}
*ypos += overlay->deltay;
if (*ypos > overlay->height) {
/* Clip text if out of frame */
overlay->silent = TRUE;
}
}
*ypos += overlay->deltay;
}
static inline void