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author | Georges Basile Stavracas Neto <georges.stavracas@gmail.com> | 2020-12-09 14:49:02 -0300 |
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committer | Georges Basile Stavracas Neto <georges.stavracas@gmail.com> | 2020-12-14 09:45:50 -0300 |
commit | 15f5087135d454b7115226b8d58344df1b0c0783 (patch) | |
tree | 093af9a6bf3ab9dedd60f688199febc70de2f0ca | |
parent | 3440fbd35883caae70529c1e1fa7d734287dba51 (diff) | |
download | mutter-15f5087135d454b7115226b8d58344df1b0c0783.tar.gz |
Introduce ClutterBlurNode
ClutterBlurNode is a paint node based on ClutterLayerNode
that draws all children in an offscreen framebuffer, blurs
this framebuffer, and finally paints the blurred contents
according the the paint operations added.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1627>
-rw-r--r-- | clutter/clutter/clutter-paint-nodes.c | 148 | ||||
-rw-r--r-- | clutter/clutter/clutter-paint-nodes.h | 21 |
2 files changed, 169 insertions, 0 deletions
diff --git a/clutter/clutter/clutter-paint-nodes.c b/clutter/clutter/clutter-paint-nodes.c index ae0eac87e..37346d5c9 100644 --- a/clutter/clutter/clutter-paint-nodes.c +++ b/clutter/clutter/clutter-paint-nodes.c @@ -41,6 +41,7 @@ #include <cogl/cogl.h> #include "clutter-actor-private.h" +#include "clutter-blur-private.h" #include "clutter-color.h" #include "clutter-debug.h" #include "clutter-private.h" @@ -1808,3 +1809,150 @@ clutter_blit_node_add_blit_rectangle (ClutterBlitNode *blit_node, dst_x + width, dst_y + height); } + +/* + * ClutterBlurNode + */ + +struct _ClutterBlurNode +{ + ClutterLayerNode parent_instance; + + ClutterBlur *blur; + unsigned int sigma; +}; + +G_DEFINE_TYPE (ClutterBlurNode, clutter_blur_node, CLUTTER_TYPE_LAYER_NODE) + +static void +clutter_blur_node_post_draw (ClutterPaintNode *node, + ClutterPaintContext *paint_context) +{ + ClutterPaintNodeClass *parent_class = + CLUTTER_PAINT_NODE_CLASS (clutter_blur_node_parent_class); + ClutterBlurNode *blur_node = CLUTTER_BLUR_NODE (node); + + clutter_blur_apply (blur_node->blur); + + parent_class->post_draw (node, paint_context); +} + +static void +clutter_blur_node_finalize (ClutterPaintNode *node) +{ + ClutterBlurNode *blur_node = CLUTTER_BLUR_NODE (node); + + g_clear_pointer (&blur_node->blur, clutter_blur_free); + + CLUTTER_PAINT_NODE_CLASS (clutter_blur_node_parent_class)->finalize (node); +} + +static JsonNode * +clutter_blur_node_serialize (ClutterPaintNode *node) +{ + ClutterBlurNode *blur_node = CLUTTER_BLUR_NODE (node); + g_autoptr (JsonBuilder) builder = NULL; + g_autofree char *src_ptr = NULL; + + src_ptr = g_strdup_printf ("%d", blur_node->sigma); + + builder = json_builder_new (); + json_builder_begin_object (builder); + json_builder_set_member_name (builder, "sigma"); + json_builder_add_string_value (builder, src_ptr); + json_builder_end_object (builder); + + return json_builder_get_root (builder); +} + +static void +clutter_blur_node_class_init (ClutterBlurNodeClass *klass) +{ + ClutterPaintNodeClass *node_class; + + node_class = CLUTTER_PAINT_NODE_CLASS (klass); + node_class->post_draw = clutter_blur_node_post_draw; + node_class->finalize = clutter_blur_node_finalize; + node_class->serialize = clutter_blur_node_serialize; +} + +static void +clutter_blur_node_init (ClutterBlurNode *blur_node) +{ +} + +/** + * clutter_blur_node_new: + * @width width of the blur layer + * @height: height of the blur layer + * @sigma: sigma value of the blur + * + * Creates a new #ClutterBlurNode. + * + * Children of this node will be painted inside a separate framebuffer, + * which will be blurred and painted on the current draw framebuffer. + * + * Return value: (transfer full): the newly created #ClutterBlurNode. + * Use clutter_paint_node_unref() when done. + */ +ClutterPaintNode * +clutter_blur_node_new (unsigned int width, + unsigned int height, + unsigned int sigma) +{ + g_autoptr (CoglOffscreen) offscreen = NULL; + g_autoptr (GError) error = NULL; + graphene_matrix_t projection; + ClutterLayerNode *layer_node; + ClutterBlurNode *blur_node; + CoglTexture2D *tex_2d; + CoglContext *context; + CoglTexture *texture; + ClutterBlur *blur; + + blur_node = _clutter_paint_node_create (CLUTTER_TYPE_BLUR_NODE); + blur_node->sigma = sigma; + context = clutter_backend_get_cogl_context (clutter_get_default_backend ()); + tex_2d = cogl_texture_2d_new_with_size (context, width, height); + + texture = COGL_TEXTURE (tex_2d); + cogl_texture_set_premultiplied (texture, TRUE); + + offscreen = cogl_offscreen_new_with_texture (texture); + cogl_object_unref (tex_2d); + if (!cogl_framebuffer_allocate (COGL_FRAMEBUFFER (offscreen), &error)) + { + g_warning ("Unable to allocate paint node offscreen: %s", + error->message); + goto out; + } + + blur = clutter_blur_new (texture, sigma); + blur_node->blur = blur; + + if (!blur) + { + g_warning ("Failed to create blur pipeline"); + goto out; + } + + layer_node = CLUTTER_LAYER_NODE (blur_node); + layer_node->offscreen = COGL_FRAMEBUFFER (g_steal_pointer (&offscreen)); + layer_node->pipeline = cogl_pipeline_copy (default_texture_pipeline); + cogl_pipeline_set_layer_filters (layer_node->pipeline, 0, + COGL_PIPELINE_FILTER_LINEAR, + COGL_PIPELINE_FILTER_LINEAR); + cogl_pipeline_set_layer_texture (layer_node->pipeline, + 0, + clutter_blur_get_texture (blur)); + + graphene_matrix_init_translate (&projection, + &GRAPHENE_POINT3D_INIT (-(width / 2.f), + -(height / 2.f), + 0.f)); + graphene_matrix_scale (&projection, 2.f / width, -2.f / height, 1.f); + cogl_framebuffer_set_projection_matrix (layer_node->offscreen, &projection); + +out: + return (ClutterPaintNode *) blur_node; +} diff --git a/clutter/clutter/clutter-paint-nodes.h b/clutter/clutter/clutter-paint-nodes.h index 410bebc88..8c01dd7d2 100644 --- a/clutter/clutter/clutter-paint-nodes.h +++ b/clutter/clutter/clutter-paint-nodes.h @@ -263,6 +263,27 @@ void clutter_blit_node_add_blit_rectangle (ClutterBlitNode *blit_node, int width, int height); +#define CLUTTER_TYPE_BLUR_NODE (clutter_blur_node_get_type ()) +#define CLUTTER_BLUR_NODE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_BLUR_NODE, ClutterBlurNode)) +#define CLUTTER_IS_BLUR_NODE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_BLUR_NODE)) + +/** + * ClutterBlurNode: + * + * The #ClutterBurNode structure is an opaque + * type whose members cannot be directly accessed. + */ +typedef struct _ClutterBlurNode ClutterBlurNode; +typedef struct _ClutterLayerNodeClass ClutterBlurNodeClass; + +CLUTTER_EXPORT +GType clutter_blur_node_get_type (void) G_GNUC_CONST; + +CLUTTER_EXPORT +ClutterPaintNode * clutter_blur_node_new (unsigned int width, + unsigned int height, + unsigned int sigma); + G_END_DECLS #endif /* __CLUTTER_PAINT_NODES_H__ */ |