return self->end;
}
+ /*** GSK_CONIC_GRADIENT_NODE ***/
+
+ struct _GskConicGradientNode
+ {
+ GskRenderNode render_node;
+
+ graphene_point_t center;
+ float rotation;
+
+ gsize n_stops;
+ GskColorStop *stops;
+ };
+
+ static void
+ gsk_conic_gradient_node_finalize (GskRenderNode *node)
+ {
+ GskConicGradientNode *self = (GskConicGradientNode *) node;
+ GskRenderNodeClass *parent_class = g_type_class_peek (g_type_parent (GSK_TYPE_CONIC_GRADIENT_NODE));
+
+ g_free (self->stops);
+
+ parent_class->finalize (node);
+ }
+
+ #define DEG_TO_RAD(x) ((x) * (G_PI / 180.f))
+
+ static void
+ _cairo_mesh_pattern_set_corner_rgba (cairo_pattern_t *pattern,
+ guint corner_num,
+ const GdkRGBA *rgba)
+ {
+ cairo_mesh_pattern_set_corner_color_rgba (pattern, corner_num, rgba->red, rgba->green, rgba->blue, rgba->alpha);
+ }
+
+ static void
+ project (double angle,
+ double radius,
+ double *x_out,
+ double *y_out)
+ {
+ double x, y;
+
+ x = radius * cos (angle);
+ y = radius * sin (angle);
+ if (copysign (x, 1.0) > copysign (y, 1.0))
+ {
+ *x_out = copysign (radius, x);
+ *y_out = y * radius / copysign (x, 1.0);
+ }
+ else
+ {
+ *x_out = x * radius / copysign (y, 1.0);
+ *y_out = copysign (radius, y);
+ }
+ }
+
+ static void
+ gsk_conic_gradient_node_add_patch (cairo_pattern_t *pattern,
+ float radius,
+ float start_angle,
+ const GdkRGBA *start_color,
+ float end_angle,
+ const GdkRGBA *end_color)
+ {
+ double x, y;
+
+ cairo_mesh_pattern_begin_patch (pattern);
+
+ cairo_mesh_pattern_move_to (pattern, 0, 0);
+ project (start_angle, radius, &x, &y);
+ cairo_mesh_pattern_line_to (pattern, x, y);
+ project (end_angle, radius, &x, &y);
+ cairo_mesh_pattern_line_to (pattern, x, y);
+ cairo_mesh_pattern_line_to (pattern, 0, 0);
+
+ _cairo_mesh_pattern_set_corner_rgba (pattern, 0, start_color);
+ _cairo_mesh_pattern_set_corner_rgba (pattern, 1, start_color);
+ _cairo_mesh_pattern_set_corner_rgba (pattern, 2, end_color);
+ _cairo_mesh_pattern_set_corner_rgba (pattern, 3, end_color);
+
+ cairo_mesh_pattern_end_patch (pattern);
+ }
+
+ static void
+ gdk_rgba_color_interpolate (GdkRGBA *dest,
+ const GdkRGBA *src1,
+ const GdkRGBA *src2,
+ double progress)
+ {
+ double alpha = src1->alpha * (1.0 - progress) + src2->alpha * progress;
+
+ dest->alpha = alpha;
+ if (alpha == 0)
+ {
+ dest->red = src1->red * (1.0 - progress) + src2->red * progress;
+ dest->green = src1->green * (1.0 - progress) + src2->green * progress;
+ dest->blue = src1->blue * (1.0 - progress) + src2->blue * progress;
+ }
+ else
+ {
+ dest->red = (src1->red * src1->alpha * (1.0 - progress) + src2->red * src2->alpha * progress) / alpha;
+ dest->green = (src1->green * src1->alpha * (1.0 - progress) + src2->green * src2->alpha * progress) / alpha;
+ dest->blue = (src1->blue * src1->alpha * (1.0 - progress) + src2->blue * src2->alpha * progress) / alpha;
+ }
+ }
+
+ static void
+ gsk_conic_gradient_node_draw (GskRenderNode *node,
+ cairo_t *cr)
+ {
+ GskConicGradientNode *self = (GskConicGradientNode *) node;
+ cairo_pattern_t *pattern;
+ graphene_point_t corner;
+ float radius;
+ gsize i;
+
+ pattern = cairo_pattern_create_mesh ();
+ graphene_rect_get_top_right (&node->bounds, &corner);
+ radius = graphene_point_distance (&self->center, &corner, NULL, NULL);
+ graphene_rect_get_bottom_right (&node->bounds, &corner);
+ radius = MAX (radius, graphene_point_distance (&self->center, &corner, NULL, NULL));
+ graphene_rect_get_bottom_left (&node->bounds, &corner);
+ radius = MAX (radius, graphene_point_distance (&self->center, &corner, NULL, NULL));
+ graphene_rect_get_top_left (&node->bounds, &corner);
+ radius = MAX (radius, graphene_point_distance (&self->center, &corner, NULL, NULL));
+
+ for (i = 0; i <= self->n_stops; i++)
+ {
+ GskColorStop *stop1 = &self->stops[MAX (i, 1) - 1];
+ GskColorStop *stop2 = &self->stops[MIN (i, self->n_stops - 1)];
+ double offset1 = i > 0 ? stop1->offset : 0;
+ double offset2 = i < self->n_stops ? stop2->offset : 1;
+ double start_angle, end_angle;
+
+ offset1 = offset1 * 360 + self->rotation - 90;
+ offset2 = offset2 * 360 + self->rotation - 90;
+
+ for (start_angle = offset1; start_angle < offset2; start_angle = end_angle)
+ {
+ GdkRGBA start_color, end_color;
+ end_angle = (floor (start_angle / 45) + 1) * 45;
+ end_angle = MIN (end_angle, offset2);
+ gdk_rgba_color_interpolate (&start_color,
+ &stop1->color,
+ &stop2->color,
+ (start_angle - offset1) / (offset2 - offset1));
+ gdk_rgba_color_interpolate (&end_color,
+ &stop1->color,
+ &stop2->color,
+ (end_angle - offset1) / (offset2 - offset1));
+
+ gsk_conic_gradient_node_add_patch (pattern,
+ radius,
+ DEG_TO_RAD (start_angle),
+ &start_color,
+ DEG_TO_RAD (end_angle),
+ &end_color);
+ }
+ }
+
+ cairo_pattern_set_extend (pattern, CAIRO_EXTEND_PAD);
+
+ gsk_cairo_rectangle (cr, &node->bounds);
+ cairo_translate (cr, self->center.x, self->center.y);
+ cairo_set_source (cr, pattern);
+ cairo_fill (cr);
+
+ cairo_pattern_destroy (pattern);
+ }
+
+ static void
+ gsk_conic_gradient_node_diff (GskRenderNode *node1,
+ GskRenderNode *node2,
+ cairo_region_t *region)
+ {
+ GskConicGradientNode *self1 = (GskConicGradientNode *) node1;
+ GskConicGradientNode *self2 = (GskConicGradientNode *) node2;
+ gsize i;
+
+ if (!graphene_point_equal (&self1->center, &self2->center) ||
+ self1->rotation != self2->rotation ||
+ self1->n_stops != self2->n_stops)
+ {
+ gsk_render_node_diff_impossible (node1, node2, region);
+ return;
+ }
+
+ for (i = 0; i < self1->n_stops; i++)
+ {
+ GskColorStop *stop1 = &self1->stops[i];
+ GskColorStop *stop2 = &self2->stops[i];
+
+ if (stop1->offset != stop2->offset ||
+ !gdk_rgba_equal (&stop1->color, &stop2->color))
+ {
+ gsk_render_node_diff_impossible (node1, node2, region);
+ return;
+ }
+ }
+ }
+
+ /**
+ * gsk_conic_gradient_node_new:
+ * @bounds: the bounds of the node
+ * @center: the center of the gradient
+ * @rotation: the rotation of the gradient in degrees
+ * @color_stops: (array length=n_color_stops): a pointer to an array of #GskColorStop defining the gradient
+ * The offsets of all color steps must be increasing. The first stop's offset must be >= 0 and the last
+ * stop's offset must be <= 1.
+ * @n_color_stops: the number of elements in @color_stops
+ *
+ * Creates a #GskRenderNode that draws a conic gradient. The conic gradient
+ * starts around @center in the direction of @rotation. A rotation of 0 means
+ * that the gradient points up. Color stops are then added clockwise.
+ *
+ * Returns: (transfer full) (type GskConicGradientNode): A new #GskRenderNode
+ */
+ GskRenderNode *
+ gsk_conic_gradient_node_new (const graphene_rect_t *bounds,
+ const graphene_point_t *center,
+ float rotation,
+ const GskColorStop *color_stops,
+ gsize n_color_stops)
+ {
+ GskConicGradientNode *self;
+ GskRenderNode *node;
+ gsize i;
+
+ g_return_val_if_fail (bounds != NULL, NULL);
+ g_return_val_if_fail (center != NULL, NULL);
+ g_return_val_if_fail (color_stops != NULL, NULL);
+ g_return_val_if_fail (n_color_stops >= 2, NULL);
+ g_return_val_if_fail (color_stops[0].offset >= 0, NULL);
+ for (i = 1; i < n_color_stops; i++)
+ g_return_val_if_fail (color_stops[i].offset >= color_stops[i - 1].offset, NULL);
+ g_return_val_if_fail (color_stops[n_color_stops - 1].offset <= 1, NULL);
+
+ self = gsk_render_node_alloc (GSK_CONIC_GRADIENT_NODE);
+ node = (GskRenderNode *) self;
+
+ graphene_rect_init_from_rect (&node->bounds, bounds);
+ graphene_point_init_from_point (&self->center, center);
+
+ self->rotation = rotation;
+
+ self->n_stops = n_color_stops;
+ self->stops = g_malloc_n (n_color_stops, sizeof (GskColorStop));
+ memcpy (self->stops, color_stops, n_color_stops * sizeof (GskColorStop));
+
+ return node;
+ }
+
+ /**
+ * gsk_conic_gradient_node_get_n_color_stops:
+ * @node: (type GskConicGradientNode): a #GskRenderNode for a conic gradient
+ *
+ * Retrieves the number of color stops in the gradient.
+ *
+ * Returns: the number of color stops
+ */
+ gsize
+ gsk_conic_gradient_node_get_n_color_stops (GskRenderNode *node)
+ {
+ GskConicGradientNode *self = (GskConicGradientNode *) node;
+
+ return self->n_stops;
+ }
+
+ /**
+ * gsk_conic_gradient_node_get_color_stops:
+ * @node: (type GskConicGradientNode): a #GskRenderNode for a conic gradient
+ * @n_stops: (out) (optional): the number of color stops in the returned array
+ *
+ * Retrieves the color stops in the gradient.
+ *
+ * Returns: (array length=n_stops): the color stops in the gradient
+ */
+ const GskColorStop *
+ gsk_conic_gradient_node_get_color_stops (GskRenderNode *node,
+ gsize *n_stops)
+ {
+ GskConicGradientNode *self = (GskConicGradientNode *) node;
+
+ if (n_stops != NULL)
+ *n_stops = self->n_stops;
+
+ return self->stops;
+ }
+
+ /**
+ * gsk_conic_gradient_node_get_center:
+ * @node: (type GskConicGradientNode): a #GskRenderNode for a conic gradient
+ *
+ * Retrieves the center pointer for the gradient.
+ *
+ * Returns: the center point for the gradient
+ */
+ const graphene_point_t *
+ gsk_conic_gradient_node_get_center (GskRenderNode *node)
+ {
+ GskConicGradientNode *self = (GskConicGradientNode *) node;
+
+ return &self->center;
+ }
+
+ /**
+ * gsk_conic_gradient_node_get_rotation:
+ * @node: (type GskConicGradientNode): a #GskRenderNode for a conic gradient
+ *
+ * Retrieves the rotation for the gradient in degrees.
+ *
+ * Returns: the rotation for the gradient
+ */
+ float
+ gsk_conic_gradient_node_get_rotation (GskRenderNode *node)
+ {
+ GskConicGradientNode *self = (GskConicGradientNode *) node;
+
+ return self->rotation;
+ }
+
/*** GSK_BORDER_NODE ***/
+/**
+ * GskBorderNode:
+ *
+ * A render node for a border.
+ */
struct _GskBorderNode
{
GskRenderNode render_node;
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