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Introduce ClutterBlitNode
It is not possible to express a blit operation using paint nodes as of now. This is a requirement for GNOME Shell, e.g., to implement its blur effect. Add a new ClutterBlitNode node that takes two framebuffers as input, and blits the source framebuffer into the current one according to added rectangles. Because this paint node uses the rectangles in a different way compared to all the other nodes, add an auxiliary method to ensure all blit operations are valid. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1340>
This commit is contained in:
Georges Basile Stavracas Neto
Marge Bot
parent
4c75389baa
commit
033423f6db
@ -1627,3 +1627,184 @@ clutter_layer_node_new_to_framebuffer (CoglFramebuffer *framebuffer,
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return (ClutterPaintNode *) res;
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}
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/*
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* ClutterBlitNode
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*/
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struct _ClutterBlitNode
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{
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ClutterPaintNode parent_instance;
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CoglFramebuffer *src;
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};
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G_DEFINE_TYPE (ClutterBlitNode, clutter_blit_node, CLUTTER_TYPE_PAINT_NODE)
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static gboolean
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clutter_blit_node_pre_draw (ClutterPaintNode *node,
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ClutterPaintContext *paint_context)
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{
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return TRUE;
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}
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static void
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clutter_blit_node_draw (ClutterPaintNode *node,
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ClutterPaintContext *paint_context)
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{
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ClutterBlitNode *blit_node = CLUTTER_BLIT_NODE (node);
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g_autoptr (GError) error = NULL;
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CoglFramebuffer *framebuffer;
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unsigned int i;
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if (node->operations == NULL)
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return;
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framebuffer = get_target_framebuffer (node, paint_context);
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for (i = 0; i < node->operations->len; i++)
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{
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const ClutterPaintOperation *op;
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float op_width, op_height;
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op = &g_array_index (node->operations, ClutterPaintOperation, i);
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switch (op->opcode)
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{
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case PAINT_OP_INVALID:
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break;
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case PAINT_OP_TEX_RECT:
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op_width = op->op.texrect[6] - op->op.texrect[4];
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op_height = op->op.texrect[7] - op->op.texrect[5];
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cogl_blit_framebuffer (blit_node->src,
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framebuffer,
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op->op.texrect[0],
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op->op.texrect[1],
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op->op.texrect[4],
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op->op.texrect[5],
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op_width,
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op_height,
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&error);
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if (error)
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{
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g_warning ("Error blitting framebuffers: %s", error->message);
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return;
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}
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break;
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case PAINT_OP_MULTITEX_RECT:
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case PAINT_OP_PRIMITIVE:
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break;
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}
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}
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}
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static void
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clutter_blit_node_finalize (ClutterPaintNode *node)
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{
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ClutterBlitNode *blit_node = CLUTTER_BLIT_NODE (node);
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g_clear_object (&blit_node->src);
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CLUTTER_PAINT_NODE_CLASS (clutter_blit_node_parent_class)->finalize (node);
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}
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static JsonNode *
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clutter_blit_node_serialize (ClutterPaintNode *node)
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{
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ClutterBlitNode *blit_node = CLUTTER_BLIT_NODE (node);
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g_autoptr (JsonBuilder) builder = NULL;
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g_autofree char *src_ptr = NULL;
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src_ptr = g_strdup_printf ("%p", blit_node->src);
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builder = json_builder_new ();
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json_builder_begin_object (builder);
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json_builder_set_member_name (builder, "source");
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json_builder_add_string_value (builder, src_ptr);
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json_builder_end_object (builder);
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return json_builder_get_root (builder);
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}
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static void
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clutter_blit_node_class_init (ClutterTransformNodeClass *klass)
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{
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ClutterPaintNodeClass *node_class;
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node_class = CLUTTER_PAINT_NODE_CLASS (klass);
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node_class->pre_draw = clutter_blit_node_pre_draw;
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node_class->draw = clutter_blit_node_draw;
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node_class->finalize = clutter_blit_node_finalize;
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node_class->serialize = clutter_blit_node_serialize;
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}
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static void
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clutter_blit_node_init (ClutterBlitNode *self)
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{
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}
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/**
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* clutter_blit_node_new:
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* @src: the source #CoglFramebuffer
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*
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* Creates a new #ClutterBlitNode that blits @src into the current
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* draw framebuffer.
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*
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* You must only add rectangles using clutter_blit_node_add_blit_rectangle().
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*
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* Return value: (transfer full): the newly created #ClutterBlitNode.
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* Use clutter_paint_node_unref() when done.
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*/
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ClutterPaintNode *
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clutter_blit_node_new (CoglFramebuffer *src)
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{
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ClutterBlitNode *res;
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g_return_val_if_fail (COGL_IS_FRAMEBUFFER (src), NULL);
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res = _clutter_paint_node_create (CLUTTER_TYPE_BLIT_NODE);
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res->src = cogl_object_ref (src);
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return (ClutterPaintNode *) res;
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}
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/**
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* clutter_blit_node_add_blit_rectangle:
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* @blit_node: a #ClutterBlitNode
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* @src_x: Source x position
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* @src_y: Source y position
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* @dst_x: Destination x position
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* @dst_y: Destination y position
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* @width: Width of region to copy
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* @height: Height of region to copy
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*
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* Adds a new blit rectangle to the stack of rectangles. All the
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* constraints of cogl_blit_framebuffer() apply here.
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*/
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void
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clutter_blit_node_add_blit_rectangle (ClutterBlitNode *blit_node,
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int src_x,
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int src_y,
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int dst_x,
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int dst_y,
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int width,
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int height)
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{
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g_return_if_fail (CLUTTER_IS_BLIT_NODE (blit_node));
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clutter_paint_node_add_texture_rectangle (CLUTTER_PAINT_NODE (blit_node),
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&(ClutterActorBox) {
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.x1 = src_x,
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.y1 = src_y,
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.x2 = src_x + width,
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.y2 = src_y + height,
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},
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dst_x,
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dst_y,
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dst_x + width,
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dst_y + height);
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}
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@ -235,6 +235,34 @@ GType clutter_transform_node_get_type (void) G_GNUC_CONST;
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CLUTTER_EXPORT
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ClutterPaintNode * clutter_transform_node_new (const graphene_matrix_t *projection);
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#define CLUTTER_TYPE_BLIT_NODE (clutter_blit_node_get_type ())
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#define CLUTTER_BLIT_NODE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_BLIT_NODE, ClutterBlitNode))
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#define CLUTTER_IS_BLIT_NODE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_BLIT_NODE))
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/*
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* ClutterBlitNode:
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*
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* The #ClutterBlitNode structure is an opaque
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* type whose members cannot be directly accessed.
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*/
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typedef struct _ClutterBlitNode ClutterBlitNode;
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typedef struct _ClutterPaintNodeClass ClutterBlitNodeClass;
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CLUTTER_EXPORT
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GType clutter_blit_node_get_type (void) G_GNUC_CONST;
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CLUTTER_EXPORT
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ClutterPaintNode * clutter_blit_node_new (CoglFramebuffer *src);
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CLUTTER_EXPORT
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void clutter_blit_node_add_blit_rectangle (ClutterBlitNode *blit_node,
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int src_x,
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int src_y,
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int dst_x,
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int dst_y,
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int width,
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int height);
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G_END_DECLS
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#endif /* __CLUTTER_PAINT_NODES_H__ */
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