static void
make_clip_path (Clip *clip)
{
switch (clip->type)
{
case CLIP_NONE:
break;
case CLIP_RECTANGLE:
cogl_path_rectangle (clip->x1,
clip->y1,
clip->x2,
clip->y2);
break;
case CLIP_ROTATED_RECTANGLE:
{
int size = MIN (ABS (clip->x2 - clip->x1),
ABS (clip->y2 - clip->y1));
int cx = (clip->x1 + clip->x2) / 2;
int cy = (clip->y1 + clip->y2) / 2;
cogl_path_move_to (cx - size / 2, cy);
cogl_path_line_to (cx, cy - size / 2);
cogl_path_line_to (cx + size / 2, cy);
cogl_path_line_to (cx, cy + size / 2);
cogl_path_close ();
}
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;
}
}
void
test_path_clip (void)
{
CoglPath *path;
CoglPipeline *pipeline;
int fb_width, fb_height;
fb_width = cogl_framebuffer_get_width (test_fb);
fb_height = cogl_framebuffer_get_height (test_fb);
cogl_framebuffer_orthographic (test_fb,
0, 0, fb_width, fb_height, -1, 100);
path = cogl_path_new ();
cogl_framebuffer_clear4f (test_fb,
COGL_BUFFER_BIT_COLOR,
1.0f, 0.0f, 0.0f, 1.0f);
/* Make an L-shape with the top right corner left untouched */
cogl_path_move_to (path, 0, fb_height);
cogl_path_line_to (path, fb_width, fb_height);
cogl_path_line_to (path, fb_width, fb_height / 2);
cogl_path_line_to (path, fb_width / 2, fb_height / 2);
cogl_path_line_to (path, fb_width / 2, 0);
cogl_path_line_to (path, 0, 0);
cogl_path_close (path);
cogl_framebuffer_push_path_clip (test_fb, path);
/* Try to fill the framebuffer with a blue rectangle. This should be
* clipped to leave the top right quadrant as is */
pipeline = cogl_pipeline_new (test_ctx);
cogl_pipeline_set_color4ub (pipeline, 0, 0, 255, 255);
cogl_framebuffer_draw_rectangle (test_fb,
pipeline,
0, 0, fb_width, fb_height);
cogl_framebuffer_pop_clip (test_fb);
cogl_object_unref (pipeline);
cogl_object_unref (path);
/* Check each of the four quadrants */
test_utils_check_pixel (test_fb,
fb_width / 4, fb_height / 4,
0x0000ffff);
test_utils_check_pixel (test_fb,
fb_width * 3 / 4, fb_height / 4,
0xff0000ff);
test_utils_check_pixel (test_fb,
fb_width / 4, fb_height * 3 / 4,
0x0000ffff);
test_utils_check_pixel (test_fb,
fb_width * 3 / 4, fb_height * 3 / 4,
0x0000ffff);
if (cogl_test_verbose ())
g_print ("OK\n");
}
void
cogl_path_round_rectangle (CoglPath *path,
float x_1,
float y_1,
float x_2,
float y_2,
float radius,
float arc_step)
{
float inner_width = x_2 - x_1 - radius * 2;
float inner_height = y_2 - y_1 - radius * 2;
_COGL_RETURN_IF_FAIL (cogl_is_path (path));
cogl_path_move_to (path, x_1, y_1 + radius);
_cogl_path_rel_arc (path,
radius, 0,
radius, radius,
180,
270,
arc_step);
cogl_path_line_to (path,
path->data->path_pen.x + inner_width,
path->data->path_pen.y);
_cogl_path_rel_arc (path,
0, radius,
radius, radius,
-90,
0,
arc_step);
cogl_path_line_to (path,
path->data->path_pen.x,
path->data->path_pen.y + inner_height);
_cogl_path_rel_arc (path,
-radius, 0,
radius, radius,
0,
90,
arc_step);
cogl_path_line_to (path,
path->data->path_pen.x - inner_width,
path->data->path_pen.y);
_cogl_path_rel_arc (path,
0, -radius,
radius, radius,
90,
180,
arc_step);
cogl_path_close (path);
}
static void
pre_paint_clip_cb (void)
{
/* Generate a clip path that clips out the top left division */
cogl_path_move_to (DIVISION_WIDTH, 0);
cogl_path_line_to (SOURCE_SIZE, 0);
cogl_path_line_to (SOURCE_SIZE, SOURCE_SIZE);
cogl_path_line_to (0, SOURCE_SIZE);
cogl_path_line_to (0, DIVISION_HEIGHT);
cogl_path_line_to (DIVISION_WIDTH, DIVISION_HEIGHT);
cogl_path_close ();
cogl_clip_push_from_path ();
}
static void
paint_triangle (ClutterActor *actor)
{
gfloat width, height;
clutter_actor_get_size (actor, &width, &height);
cogl_set_source_color4ub (0xff, 0xff, 0xff, 0xff);
cogl_path_move_to (width/2, 0);
cogl_path_line_to (width, height);
cogl_path_line_to (0, height);
cogl_path_close ();
cogl_path_fill ();
}
static void
circle_paint_cb (ClutterActor *actor)
{
const CoglColor fill_color = { 0xff, 0xff, 0xff, 0x80 };
gint i;
gdouble angle;
guint radius = clutter_actor_get_width (actor) / 2;
cogl_set_source_color (&fill_color);
angle = *((gdouble *)g_object_get_data (G_OBJECT (actor), "angle"));
for (i = 0; i < CIRCLE_S; i++, angle += (2.0 * G_PI) / (gdouble) CIRCLE_S)
{
gdouble angle2 = angle + ((2.0 * G_PI) / (gdouble)CIRCLE_S) / 2.0;
cogl_path_move_to (((radius - CIRCLE_W) * cos (angle)) + radius,
((radius - CIRCLE_W) * sin (angle)) + radius);
cogl_path_arc (radius, radius, radius, radius,
CLUTTER_ANGLE_FROM_RAD (angle),
CLUTTER_ANGLE_FROM_RAD (angle2));
cogl_path_line_to (((radius - CIRCLE_W) * cos (angle2)) + radius,
((radius - CIRCLE_W) * sin (angle2)) + radius);
cogl_path_arc (radius, radius, radius - CIRCLE_W, radius - CIRCLE_W,
CLUTTER_ANGLE_FROM_RAD (angle2),
CLUTTER_ANGLE_FROM_RAD (angle));
cogl_path_close ();
cogl_path_fill ();
}
}
static VALUE
rb_cogl_path_line_to (VALUE self, VALUE x, VALUE y)
{
cogl_path_line_to (rbclt_num_to_fixed (x),
rbclt_num_to_fixed (y));
return Qnil;
}
static void
path_shapes (gint x, gint y, gint width, gint height)
{
cogl_path_move_to (x, y);
cogl_path_line_to (x, (y + height * 4 / 5));
cogl_path_line_to ((x + width * 4 / 15), (y + height * 4 / 5));
cogl_path_close ();
cogl_path_rectangle (x + width / 3,
y,
x + width * 9 / 15,
y + height * 4 / 5);
cogl_path_ellipse ((x + width * 4 / 5),
(y + height * 2 / 5),
(width * 2 / 15),
(height * 2 / 5));
}
void
cogl_path_line (CoglPath *path,
float x_1,
float y_1,
float x_2,
float y_2)
{
cogl_path_move_to (path, x_1, y_1);
cogl_path_line_to (path, x_2, y_2);
}
void
cogl_path_polyline (CoglPath *path,
const float *coords,
int num_points)
{
int c = 0;
_COGL_RETURN_IF_FAIL (cogl_is_path (path));
cogl_path_move_to (path, coords[0], coords[1]);
for (c = 1; c < num_points; ++c)
cogl_path_line_to (path, coords[2*c], coords[2*c+1]);
}
void
cogl_path_rectangle (CoglPath *path,
float x_1,
float y_1,
float x_2,
float y_2)
{
CoglBool is_rectangle;
/* If the path was previously empty and the rectangle isn't mirrored
then we'll record that this is a simple rectangle path so that we
can optimise it */
is_rectangle = (path->data->path_nodes->len == 0 &&
x_2 >= x_1 &&
y_2 >= y_1);
cogl_path_move_to (path, x_1, y_1);
cogl_path_line_to (path, x_2, y_1);
cogl_path_line_to (path, x_2, y_2);
cogl_path_line_to (path, x_1, y_2);
cogl_path_close (path);
path->data->is_rectangle = is_rectangle;
}
void
cogl_path_rel_line_to (CoglPath *path,
float x,
float y)
{
CoglPathData *data;
_COGL_RETURN_IF_FAIL (cogl_is_path (path));
data = path->data;
cogl_path_line_to (path,
data->path_pen.x + x,
data->path_pen.y + y);
}
static void
_cogl_path_arc (CoglPath *path,
float center_x,
float center_y,
float radius_x,
float radius_y,
float angle_1,
float angle_2,
float angle_step,
unsigned int move_first)
{
float a = 0x0;
float cosa = 0x0;
float sina = 0x0;
float px = 0x0;
float py = 0x0;
/* Fix invalid angles */
if (angle_1 == angle_2 || angle_step == 0x0)
return;
if (angle_step < 0x0)
angle_step = -angle_step;
/* Walk the arc by given step */
a = angle_1;
while (a != angle_2)
{
cosa = cosf (a * (G_PI/180.0));
sina = sinf (a * (G_PI/180.0));
px = center_x + (cosa * radius_x);
py = center_y + (sina * radius_y);
if (a == angle_1 && move_first)
cogl_path_move_to (path, px, py);
else
cogl_path_line_to (path, px, py);
if (G_LIKELY (angle_2 > angle_1))
{
a += angle_step;
if (a > angle_2)
a = angle_2;
}
else
{
a -= angle_step;
if (a < angle_2)
a = angle_2;
}
}
/* Make sure the final point is drawn */
cosa = cosf (angle_2 * (G_PI/180.0));
sina = sinf (angle_2 * (G_PI/180.0));
px = center_x + (cosa * radius_x);
py = center_y + (sina * radius_y);
cogl_path_line_to (path, px, py);
}