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Convert frame region handling to cairo regions

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It's useful to get frame shapes and manipulate them within Mutter, for
example so that the compositor can use them to clip drawing.
For this, we'll need the regions as cairo regions not X regions, so
convert frame shaping code to work in terms of cairo_region_t.

https://bugzilla.gnome.org/show_bug.cgi?id=635268
This commit is contained in:
Owen W. Taylor 2011-03-20 16:26:27 -04:00
parent c30c29b8c3
commit c3a04bf394
1 changed files with 80 additions and 47 deletions
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127
src/ui/frames.c
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@ -764,6 +764,39 @@ meta_frames_unflicker_bg (MetaFrames *frames,
set_background_none (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), frame->xwindow);
}
#ifdef HAVE_SHAPE
static void
apply_cairo_region_to_window (Display *display,
Window xwindow,
cairo_region_t *region,
int op)
{
int n_rects, i;
XRectangle *rects;
n_rects = cairo_region_num_rectangles (region);
rects = g_new (XRectangle, n_rects);
for (i = 0; i < n_rects; i++)
{
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (region, i, &rect);
rects[i].x = rect.x;
rects[i].y = rect.y;
rects[i].width = rect.width;
rects[i].height = rect.height;
}
XShapeCombineRectangles (display, xwindow,
ShapeBounding, 0, 0, rects, n_rects,
ShapeSet, YXBanded);
g_free (rects);
}
#endif
void
meta_frames_apply_shapes (MetaFrames *frames,
Window xwindow,
@ -775,9 +808,9 @@ meta_frames_apply_shapes (MetaFrames *frames,
/* Apply shapes as if window had new_window_width, new_window_height */
MetaUIFrame *frame;
MetaFrameGeometry fgeom;
XRectangle xrect;
Region corners_xregion;
Region window_xregion;
cairo_rectangle_int_t rect;
cairo_region_t *corners_region;
cairo_region_t *window_region;
Display *display;
frame = meta_frames_lookup_window (frames, xwindow);
@ -813,7 +846,7 @@ meta_frames_apply_shapes (MetaFrames *frames,
return; /* nothing to do */
}
corners_xregion = XCreateRegion ();
corners_region = cairo_region_create ();
if (fgeom.top_left_corner_rounded_radius != 0)
{
@ -824,12 +857,12 @@ meta_frames_apply_shapes (MetaFrames *frames,
for (i=0; i<corner; i++)
{
const int width = floor(0.5 + radius - sqrt(radius*radius - (radius-(i+0.5))*(radius-(i+0.5))));
xrect.x = 0;
xrect.y = i;
xrect.width = width;
xrect.height = 1;
rect.x = 0;
rect.y = i;
rect.width = width;
rect.height = 1;
XUnionRectWithRegion (&xrect, corners_xregion, corners_xregion);
cairo_region_union_rectangle (corners_region, &rect);
}
}
@ -842,12 +875,12 @@ meta_frames_apply_shapes (MetaFrames *frames,
for (i=0; i<corner; i++)
{
const int width = floor(0.5 + radius - sqrt(radius*radius - (radius-(i+0.5))*(radius-(i+0.5))));
xrect.x = new_window_width - width;
xrect.y = i;
xrect.width = width;
xrect.height = 1;
rect.x = new_window_width - width;
rect.y = i;
rect.width = width;
rect.height = 1;
XUnionRectWithRegion (&xrect, corners_xregion, corners_xregion);
cairo_region_union_rectangle (corners_region, &rect);
}
}
@ -860,12 +893,12 @@ meta_frames_apply_shapes (MetaFrames *frames,
for (i=0; i<corner; i++)
{
const int width = floor(0.5 + radius - sqrt(radius*radius - (radius-(i+0.5))*(radius-(i+0.5))));
xrect.x = 0;
xrect.y = new_window_height - i - 1;
xrect.width = width;
xrect.height = 1;
rect.x = 0;
rect.y = new_window_height - i - 1;
rect.width = width;
rect.height = 1;
XUnionRectWithRegion (&xrect, corners_xregion, corners_xregion);
cairo_region_union_rectangle (corners_region, &rect);
}
}
@ -878,27 +911,27 @@ meta_frames_apply_shapes (MetaFrames *frames,
for (i=0; i<corner; i++)
{
const int width = floor(0.5 + radius - sqrt(radius*radius - (radius-(i+0.5))*(radius-(i+0.5))));
xrect.x = new_window_width - width;
xrect.y = new_window_height - i - 1;
xrect.width = width;
xrect.height = 1;
rect.x = new_window_width - width;
rect.y = new_window_height - i - 1;
rect.width = width;
rect.height = 1;
XUnionRectWithRegion (&xrect, corners_xregion, corners_xregion);
cairo_region_union_rectangle (corners_region, &rect);
}
}
window_xregion = XCreateRegion ();
window_region = cairo_region_create ();
xrect.x = 0;
xrect.y = 0;
xrect.width = new_window_width;
xrect.height = new_window_height;
rect.x = 0;
rect.y = 0;
rect.width = new_window_width;
rect.height = new_window_height;
XUnionRectWithRegion (&xrect, window_xregion, window_xregion);
cairo_region_union_rectangle (window_region, &rect);
XSubtractRegion (window_xregion, corners_xregion, window_xregion);
cairo_region_subtract (window_region, corners_region);
XDestroyRegion (corners_xregion);
cairo_region_destroy (corners_region);
if (window_has_shape)
{
@ -911,7 +944,7 @@ meta_frames_apply_shapes (MetaFrames *frames,
XSetWindowAttributes attrs;
Window shape_window;
Window client_window;
Region client_xregion;
cairo_region_t *client_region;
GdkScreen *screen;
int screen_number;
@ -951,21 +984,21 @@ meta_frames_apply_shapes (MetaFrames *frames,
/* Punch the client area out of the normal frame shape,
* then union it with the shape_window's existing shape
*/
client_xregion = XCreateRegion ();
client_region = cairo_region_create ();
xrect.x = fgeom.left_width;
xrect.y = fgeom.top_height;
xrect.width = new_window_width - fgeom.right_width - xrect.x;
xrect.height = new_window_height - fgeom.bottom_height - xrect.y;
rect.x = fgeom.left_width;
rect.y = fgeom.top_height;
rect.width = new_window_width - fgeom.right_width - rect.x;
rect.height = new_window_height - fgeom.bottom_height - rect.y;
XUnionRectWithRegion (&xrect, client_xregion, client_xregion);
cairo_region_union_rectangle (client_region, &rect);
XSubtractRegion (window_xregion, client_xregion, window_xregion);
cairo_region_subtract (window_region, client_region);
XDestroyRegion (client_xregion);
XShapeCombineRegion (display, shape_window,
ShapeBounding, 0, 0, window_xregion, ShapeUnion);
cairo_region_destroy (client_region);
apply_cairo_region_to_window (display, shape_window,
window_region, ShapeUnion);
/* Now copy shape_window shape to the real frame */
XShapeCombineShape (display, frame->xwindow, ShapeBounding,
@ -984,13 +1017,13 @@ meta_frames_apply_shapes (MetaFrames *frames,
"Frame 0x%lx has shaped corners\n",
frame->xwindow);
XShapeCombineRegion (display, frame->xwindow,
ShapeBounding, 0, 0, window_xregion, ShapeSet);
apply_cairo_region_to_window (display, frame->xwindow,
window_region, ShapeSet);
}
frame->shape_applied = TRUE;
XDestroyRegion (window_xregion);
cairo_region_destroy (window_region);
#endif /* HAVE_SHAPE */
}