mutter/tests/interactive/test-clip.c
Neil Roberts 89e7552ca3 Bug 1172 - Disjoint paths and clip to path
* clutter/cogl/cogl-path.h:
	* clutter/cogl/common/cogl-primitives.c:
	* clutter/cogl/common/cogl-primitives.h:
	* clutter/cogl/gl/cogl-primitives.c:
	* clutter/cogl/gles/cogl-primitives.c: Changed the semantics of
	cogl_path_move_to. Previously this always started a new path but
	now it instead starts a new disjoint sub path. The path isn't
	cleared until you call either cogl_path_stroke, cogl_path_fill or
	cogl_path_new. There are also cogl_path_stroke_preserve and
	cogl_path_fill_preserve functions.

	* clutter/cogl/gl/cogl-context.c:
	* clutter/cogl/gl/cogl-context.h:
	* clutter/cogl/gles/cogl-context.c:
	* clutter/cogl/gles/cogl-context.h: Convert the path nodes array
	to a GArray.

	* clutter/cogl/gl/cogl-texture.c:
	* clutter/cogl/gles/cogl-texture.c: Call cogl_clip_ensure

	* clutter/cogl/common/cogl-clip-stack.c:
	* clutter/cogl/common/cogl-clip-stack.h: Simplified the clip
	stack code quite a bit to make it more maintainable.  Previously
	whenever you added a new clip it would go through a separate route
	to immediately intersect with the current clip and when you
	removed it again it would immediately rebuild the entire clip. Now
	when you add or remove a clip it doesn't do anything immediately
	but just sets a dirty flag instead.

	* clutter/cogl/gl/cogl.c:
	* clutter/cogl/gles/cogl.c: Taken away the code to intersect
	stencil clips when there is exactly one stencil bit. It won't work
	with path clips and I don't know of any platform that doesn't have
	eight or zero stencil bits. It needs at least three bits to
	intersect a path with an existing clip. cogl_features_init now
	just decides you don't have a stencil buffer at all if you have
	less than three bits.

	* clutter/cogl/cogl.h.in: New functions and documentation.

	* tests/interactive/test-clip.c: Replaced with a different test
	that lets you add and remove clips. The three different mouse
	buttons add clips in different shapes. This makes it easier to
	test multiple levels of clipping.

	* tests/interactive/test-cogl-primitives.c: Use
	cogl_path_stroke_preserve when using the same path again.

	* doc/reference/cogl/cogl-sections.txt: Document the new
	functions.
2008-12-04 13:45:09 +00:00

337 lines
8.8 KiB
C

#include <clutter/clutter.h>
#include <gmodule.h>
typedef struct _CallbackData CallbackData;
typedef struct _Clip Clip;
typedef enum
{
CLIP_NONE,
CLIP_RECTANGLE,
CLIP_ELLIPSE,
CLIP_SHAPES
} ClipType;
struct _Clip
{
ClipType type;
gint x1, y1, x2, y2;
};
struct _CallbackData
{
ClutterActor *stage;
CoglHandle hand;
Clip current_clip;
GSList *clips;
};
static const char
instructions[] =
"Press and drag any of the three mouse buttons to add a clip with different "
"shapes. Press 'r' to reset or 'u' to undo the last clip.";
static void
path_shapes (gint x, gint y, gint width, gint height)
{
cogl_path_move_to (CLUTTER_INT_TO_FIXED (x), CLUTTER_INT_TO_FIXED (y));
cogl_path_line_to (CLUTTER_INT_TO_FIXED (x),
CLUTTER_INT_TO_FIXED (y + height * 4 / 5));
cogl_path_line_to (CLUTTER_INT_TO_FIXED (x + width * 4 / 15),
CLUTTER_INT_TO_FIXED (y + height * 4 / 5));
cogl_path_close ();
cogl_path_rectangle (CLUTTER_INT_TO_FIXED (x + width / 3),
CLUTTER_INT_TO_FIXED (y),
CLUTTER_INT_TO_FIXED (width * 4 / 15),
CLUTTER_INT_TO_FIXED (height * 4 / 5));
cogl_path_ellipse (CLUTTER_INT_TO_FIXED (x + width * 4 / 5),
CLUTTER_INT_TO_FIXED (y + height * 2 / 5),
CLUTTER_INT_TO_FIXED (width * 2 / 15),
CLUTTER_INT_TO_FIXED (height * 2 / 5));
}
static void
draw_shapes (gint x, gint y)
{
path_shapes (x, y, 300, 100);
cogl_set_source_color4ub (0x00, 0x00, 0xff, 0xff);
cogl_path_fill_preserve ();
cogl_set_source_color4ub (0xff, 0x00, 0x00, 0xff);
cogl_path_stroke ();
}
static void
make_clip_path (Clip *clip)
{
switch (clip->type)
{
case CLIP_NONE:
break;
case CLIP_RECTANGLE:
cogl_path_rectangle (CLUTTER_INT_TO_FIXED (clip->x1),
CLUTTER_INT_TO_FIXED (clip->y1),
CLUTTER_INT_TO_FIXED (clip->x2 - clip->x1),
CLUTTER_INT_TO_FIXED (clip->y2 - clip->y1));
break;
case CLIP_ELLIPSE:
cogl_path_ellipse (CLUTTER_INT_TO_FIXED (clip->x1 + clip->x2) / 2,
CLUTTER_INT_TO_FIXED (clip->y1 + clip->y2) / 2,
CLUTTER_INT_TO_FIXED (clip->x2 - clip->x1) / 2,
CLUTTER_INT_TO_FIXED (clip->y2 - clip->y1) / 2);
break;
case CLIP_SHAPES:
{
int x, y, width, height;
if (clip->x1 < clip->x2)
{
x = clip->x1;
width = clip->x2 - x;
}
else
{
x = clip->x2;
width = clip->x1 - x;
}
if (clip->y1 < clip->y2)
{
y = clip->y1;
height = clip->y2 - y;
}
else
{
y = clip->y2;
height = clip->y1 - y;
}
path_shapes (x, y, width, height);
}
break;
}
}
static void
on_paint (ClutterActor *actor, CallbackData *data)
{
int i;
ClutterGeometry stage_size;
guint hand_width, hand_height;
GSList *node;
clutter_actor_get_allocation_geometry (data->stage, &stage_size);
hand_width = cogl_texture_get_width (data->hand);
hand_height = cogl_texture_get_height (data->hand);
/* Setup the clipping */
for (node = data->clips; node; node = node->next)
{
Clip *clip = (Clip *) node->data;
if (clip->type == CLIP_RECTANGLE)
cogl_clip_set (CLUTTER_INT_TO_FIXED (clip->x1),
CLUTTER_INT_TO_FIXED (clip->y1),
CLUTTER_INT_TO_FIXED (clip->x2 - clip->x1),
CLUTTER_INT_TO_FIXED (clip->y2 - clip->y1));
else
{
make_clip_path (clip);
cogl_clip_set_from_path ();
}
}
/* Draw a rectangle filling the entire stage */
cogl_set_source_color4ub (0x80, 0x80, 0xff, 0xff);
cogl_rectangle (0, 0, stage_size.width, stage_size.height);
draw_shapes (10, 10);
/* Draw the hand at different rotations */
for (i = -2; i <= 2; i++)
{
cogl_push_matrix ();
cogl_translate (stage_size.width / 2 + stage_size.width / 6 * i,
stage_size.height / 2, 0);
cogl_rotate (i * 40, 0, 1, 0);
cogl_set_source_color4ub (0xff, 0xff, 0xff, 0xff);
cogl_texture_rectangle (data->hand,
CLUTTER_INT_TO_FIXED (-hand_width / 2),
CLUTTER_INT_TO_FIXED (-hand_height / 2),
CLUTTER_INT_TO_FIXED (hand_width / 2),
CLUTTER_INT_TO_FIXED (hand_height / 2),
0, 0, CFX_ONE, CFX_ONE);
cogl_pop_matrix ();
}
draw_shapes (stage_size.width - 310, stage_size.height - 110);
/* Remove all of the clipping */
g_slist_foreach (data->clips, (GFunc) cogl_clip_unset, NULL);
/* Draw the bounding box for each of the clips */
for (node = data->clips; node; node = node->next)
{
Clip *clip = (Clip *) node->data;
make_clip_path (clip);
cogl_set_source_color4ub (0x00, 0x00, 0xff, 0xff);
cogl_path_stroke ();
}
/* Draw the bounding box for the pending new clip */
if (data->current_clip.type != CLIP_NONE)
{
make_clip_path (&data->current_clip);
cogl_set_source_color4ub (0xff, 0x00, 0x00, 0xff);
cogl_path_stroke ();
}
}
static gboolean
on_button_press (ClutterActor *stage, ClutterButtonEvent *event,
CallbackData *data)
{
data->current_clip.x1 = data->current_clip.x2 = event->x;
data->current_clip.y1 = data->current_clip.y2 = event->y;
data->current_clip.type
= event->button == 1 ? CLIP_RECTANGLE
: event->button == 2 ? CLIP_SHAPES
: CLIP_ELLIPSE;
clutter_actor_queue_redraw (stage);
return FALSE;
}
static gboolean
on_button_release (ClutterActor *stage, ClutterButtonEvent *event,
CallbackData *data)
{
if (data->current_clip.type != CLIP_NONE)
{
data->clips = g_slist_prepend (data->clips,
g_slice_copy (sizeof (Clip),
&data->current_clip));
data->current_clip.type = CLIP_NONE;
}
clutter_actor_queue_redraw (stage);
return FALSE;
}
static gboolean
on_motion (ClutterActor *stage, ClutterMotionEvent *event,
CallbackData *data)
{
if (data->current_clip.type != CLIP_NONE)
{
data->current_clip.x2 = event->x;
data->current_clip.y2 = event->y;
clutter_actor_queue_redraw (stage);
}
return FALSE;
}
static void
free_clips (CallbackData *data)
{
GSList *node;
for (node = data->clips; node; node = node->next)
g_slice_free (Clip, node->data);
g_slist_free (data->clips);
data->clips = NULL;
}
static gpointer
on_key_press (ClutterActor *stage, ClutterKeyEvent *event,
CallbackData *data)
{
switch (event->keyval)
{
case CLUTTER_r:
free_clips (data);
clutter_actor_queue_redraw (stage);
break;
case CLUTTER_u:
if (data->clips)
{
g_slice_free (Clip, data->clips->data);
data->clips = g_slist_delete_link (data->clips, data->clips);
clutter_actor_queue_redraw (stage);
}
break;
}
return FALSE;
}
G_MODULE_EXPORT int
test_clip_main (int argc, char **argv)
{
CallbackData data;
ClutterActor *stub_actor, *label;
clutter_init (&argc, &argv);
data.current_clip.type = CLIP_NONE;
data.clips = NULL;
data.stage = clutter_stage_get_default ();
stub_actor = clutter_rectangle_new ();
clutter_container_add (CLUTTER_CONTAINER (data.stage), stub_actor, NULL);
data.hand = cogl_texture_new_from_file ("redhand.png", 64, FALSE,
COGL_PIXEL_FORMAT_ANY, NULL);
label = clutter_label_new_with_text ("Sans 12px", instructions);
clutter_label_set_line_wrap (CLUTTER_LABEL (label), TRUE);
clutter_actor_set_width (label, clutter_actor_get_width (data.stage) - 310);
clutter_actor_set_y (label,
clutter_actor_get_height (data.stage)
- clutter_actor_get_height (label));
clutter_container_add (CLUTTER_CONTAINER (data.stage), label, NULL);
g_signal_connect (stub_actor, "paint", G_CALLBACK (on_paint), &data);
g_signal_connect (data.stage, "button-press-event",
G_CALLBACK (on_button_press), &data);
g_signal_connect (data.stage, "button-release-event",
G_CALLBACK (on_button_release), &data);
g_signal_connect (data.stage, "motion-event",
G_CALLBACK (on_motion), &data);
g_signal_connect (data.stage, "key-press-event",
G_CALLBACK (on_key_press), &data);
clutter_actor_show (data.stage);
clutter_main ();
cogl_texture_unref (data.hand);
free_clips (&data);
return 0;
}