static float
GetDisplayportCoverage(const CSSRect& aDisplayPort,
const Matrix4x4& aTransformToScreen,
const IntRect& aScreenRect)
{
Rect transformedDisplayport =
aTransformToScreen.TransformBounds(aDisplayPort.ToUnknownRect());
transformedDisplayport.RoundOut();
IntRect displayport = IntRect(transformedDisplayport.x,
transformedDisplayport.y,
transformedDisplayport.width,
transformedDisplayport.height);
if (!displayport.Contains(aScreenRect)) {
nsIntRegion coveredRegion;
coveredRegion.And(aScreenRect, displayport);
return coveredRegion.Area() / (float)(aScreenRect.width * aScreenRect.height);
}
return 1.0f;
}
View*
View::ViewAt(const BPoint& where)
{
if (!fVisible)
return NULL;
IntRect frame = Frame();
if (Parent() != NULL)
Parent()->ConvertToScreen(&frame);
if (!frame.Contains(where))
return NULL;
for (View* child = FirstChild(); child; child = child->NextSibling()) {
View* view = child->ViewAt(where);
if (view != NULL)
return view;
}
return this;
}
static bool
_get_rectangular_clip (cairo_t *cr,
const IntRect& bounds,
bool *need_clip,
IntRect *rectangles, int max_rectangles,
int *num_rectangles)
{
cairo_rectangle_list_t *cliplist;
cairo_rectangle_t *clips;
int i;
bool retval = true;
cliplist = cairo_copy_clip_rectangle_list (cr);
if (cliplist->status != CAIRO_STATUS_SUCCESS) {
retval = false;
NATIVE_DRAWING_NOTE("FALLBACK: non-rectangular clip");
goto FINISH;
}
/* the clip is always in surface backend coordinates (i.e. native backend coords) */
clips = cliplist->rectangles;
for (i = 0; i < cliplist->num_rectangles; ++i) {
IntRect rect;
if (!_convert_coord_to_int (clips[i].x, &rect.x) ||
!_convert_coord_to_int (clips[i].y, &rect.y) ||
!_convert_coord_to_int (clips[i].width, &rect.width) ||
!_convert_coord_to_int (clips[i].height, &rect.height))
{
retval = false;
NATIVE_DRAWING_NOTE("FALLBACK: non-integer clip");
goto FINISH;
}
if (rect.IsEqualInterior(bounds)) {
/* the bounds are entirely inside the clip region so we don't need to clip. */
*need_clip = false;
goto FINISH;
}
NS_ASSERTION(bounds.Contains(rect),
"Was expecting to be clipped to bounds");
if (i >= max_rectangles) {
retval = false;
NATIVE_DRAWING_NOTE("FALLBACK: unsupported clip rectangle count");
goto FINISH;
}
rectangles[i] = rect;
}
*need_clip = true;
*num_rectangles = cliplist->num_rectangles;
FINISH:
cairo_rectangle_list_destroy (cliplist);
return retval;
}
