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Bug 631599 - Allow to use arbitrary surfaces for offscreen windows

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Add signal GdkWindow::create-surface which allows to use any
surface type as storage for offscreen windows.

Test the new signal in tests/gdkoffscreenbox.c
This commit is contained in:
Michael Natterer 2010-10-14 13:25:23 +02:00
parent 10c76c1c95
commit 9d9742f1e5
6 changed files with 98 additions and 10 deletions
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3
gdk/gdkinternals.h
View File

@ -550,6 +550,9 @@ GType gdk_offscreen_window_get_type (void);
void _gdk_offscreen_window_new (GdkWindow *window,
GdkWindowAttr *attributes,
gint attributes_mask);
cairo_surface_t * _gdk_offscreen_window_create_surface (GdkWindow *window,
gint width,
gint height);
/************************************

1
gdk/gdkmarshalers.list
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@ -3,4 +3,5 @@ VOID:BOOLEAN
VOID:POINTER,POINTER,POINTER
OBJECT:VOID
OBJECT:DOUBLE,DOUBLE
BOXED:INT,INT
VOID:DOUBLE,DOUBLE,POINTER,POINTER

36
gdk/gdkoffscreenwindow.c
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@ -113,17 +113,11 @@ get_surface (GdkOffscreenWindow *offscreen)
if (! offscreen->surface)
{
GdkWindowObject *private = (GdkWindowObject *) offscreen->wrapper;
cairo_surface_t *similar;
similar = _gdk_drawable_ref_cairo_surface ((GdkWindow *)private->parent);
offscreen->surface = cairo_surface_create_similar (similar,
/* FIXME: use visual */
CAIRO_CONTENT_COLOR,
g_signal_emit_by_name (private, "create-surface",
private->width,
private->height);
cairo_surface_destroy (similar);
private->height,
&offscreen->surface);
}
return offscreen->surface;
@ -155,6 +149,30 @@ gdk_offscreen_window_ref_cairo_surface (GdkDrawable *drawable)
return cairo_surface_reference (get_surface (offscreen));
}
cairo_surface_t *
_gdk_offscreen_window_create_surface (GdkWindow *offscreen,
gint width,
gint height)
{
GdkWindowObject *private = (GdkWindowObject *) offscreen;
cairo_surface_t *similar;
cairo_surface_t *surface;
g_return_val_if_fail (GDK_IS_OFFSCREEN_WINDOW (private->impl), NULL);
similar = _gdk_drawable_ref_cairo_surface ((GdkWindow *)private->parent);
surface = cairo_surface_create_similar (similar,
/* FIXME: use visual */
CAIRO_CONTENT_COLOR,
width,
height);
cairo_surface_destroy (similar);
return surface;
}
void
_gdk_offscreen_window_new (GdkWindow *window,
GdkWindowAttr *attributes,

50
gdk/gdkwindow.c
View File

@ -27,6 +27,8 @@
#include "config.h"
#include <cairo-gobject.h>
#include "gdkwindow.h"
#ifdef GDK_WINDOWING_X11
@ -185,6 +187,7 @@ enum {
PICK_EMBEDDED_CHILD, /* only called if children are embedded */
TO_EMBEDDER,
FROM_EMBEDDER,
CREATE_SURFACE,
LAST_SIGNAL
};
@ -353,6 +356,18 @@ accumulate_get_window (GSignalInvocationHint *ihint,
return g_value_get_object (handler_return) == NULL;
}
static gboolean
create_surface_accumulator (GSignalInvocationHint *ihint,
GValue *return_accu,
const GValue *handler_return,
gpointer data)
{
g_value_copy (handler_return, return_accu);
/* Stop on the first non-NULL return value */
return g_value_get_boxed (handler_return) == NULL;
}
static GQuark quark_pointer_window = 0;
static void
@ -373,6 +388,8 @@ gdk_window_class_init (GdkWindowObjectClass *klass)
drawable_class->get_clip_region = gdk_window_get_clip_region;
drawable_class->get_visible_region = gdk_window_get_visible_region;
klass->create_surface = _gdk_offscreen_window_create_surface;
quark_pointer_window = g_quark_from_static_string ("gtk-pointer-window");
@ -476,6 +493,39 @@ gdk_window_class_init (GdkWindowObjectClass *klass)
G_TYPE_DOUBLE,
G_TYPE_POINTER,
G_TYPE_POINTER);
/**
* GdkWindow::create-surface:
* @window: the offscreen window on which the signal is emitted
* @width: the width of the offscreen surface to create
* @height: the height of the offscreen surface to create
*
* The ::create-surface signal is emitted when an offscreen window
* needs its surface (re)created, which happens either when the the
* window is first drawn to, or when the window is being
* resized. The first signal handler that returns a non-%NULL
* surface will stop any further signal emission, and its surface
* will be used.
*
* Note that it is not possible to access the window's previous
* surface from within any callback of this signal. Calling
* gdk_offscreen_window_get_surface() will lead to a crash.
*
* Returns: the newly created #cairo_surface_t for the offscreen window
*
* Since: 3.0
*/
signals[CREATE_SURFACE] =
g_signal_new (g_intern_static_string ("create-surface"),
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GdkWindowObjectClass, create_surface),
create_surface_accumulator, NULL,
_gdk_marshal_BOXED__INT_INT,
CAIRO_GOBJECT_TYPE_SURFACE,
2,
G_TYPE_INT,
G_TYPE_INT);
}
static void

4
gdk/gdkwindow.h
View File

@ -489,6 +489,10 @@ typedef struct _GdkWindowObjectClass GdkWindowObjectClass;
struct _GdkWindowObjectClass
{
GdkDrawableClass parent_class;
cairo_surface_t * (* create_surface) (GdkWindow *window,
gint width,
gint height);
};
/* Windows

12
tests/gtkoffscreenbox.c
View File

@ -234,6 +234,14 @@ offscreen_window_from_parent2 (GdkWindow *window,
offscreen_x, offscreen_y);
}
static cairo_surface_t *
gdk_offscreen_box_create_alpha_image_surface (GdkWindow *offscreen,
gint width,
gint height)
{
return cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
}
static void
gtk_offscreen_box_realize (GtkWidget *widget)
{
@ -323,6 +331,10 @@ gtk_offscreen_box_realize (GtkWidget *widget)
gtk_widget_set_parent_window (offscreen_box->child2, offscreen_box->offscreen_window2);
gdk_offscreen_window_set_embedder (offscreen_box->offscreen_window2,
window);
g_signal_connect (offscreen_box->offscreen_window2, "create-surface",
G_CALLBACK (gdk_offscreen_box_create_alpha_image_surface),
offscreen_box);
g_signal_connect (offscreen_box->offscreen_window2, "to-embedder",
G_CALLBACK (offscreen_window_to_parent2), offscreen_box);
g_signal_connect (offscreen_box->offscreen_window2, "from-embedder",