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[gtk/wip/otte/lottie: 98/173] gsk: Add GskStrokeNode


commit e06801284299d253347c9240c384a95b5e1c055f
Author: Benjamin Otte <otte redhat com>
Date:   Wed Nov 11 07:36:04 2020 +0100

    gsk: Add GskStrokeNode

 gsk/broadway/gskbroadwayrenderer.c |   2 +
 gsk/gl/gskglrenderer.c             |   1 +
 gsk/gskenums.h                     |   1 +
 gsk/gskrendernode.h                |  15 ++++
 gsk/gskrendernodeimpl.c            | 180 +++++++++++++++++++++++++++++++++++++
 gsk/gskrendernodeparser.c          |  22 ++++-
 gsk/vulkan/gskvulkanrenderpass.c   |   1 +
 gtk/inspector/recorder.c           |  47 +++++++++-
 8 files changed, 265 insertions(+), 4 deletions(-)
---
diff --git a/gsk/broadway/gskbroadwayrenderer.c b/gsk/broadway/gskbroadwayrenderer.c
index 6a0b2a2aaf..8cbfa48418 100644
--- a/gsk/broadway/gskbroadwayrenderer.c
+++ b/gsk/broadway/gskbroadwayrenderer.c
@@ -270,6 +270,7 @@ collect_reused_child_nodes (GskRenderer *renderer,
     case GSK_CROSS_FADE_NODE:
     case GSK_BLUR_NODE:
     case GSK_FILL_NODE:
+    case GSK_STROKE_NODE:
 
     default:
 
@@ -857,6 +858,7 @@ gsk_broadway_renderer_add_node (GskRenderer *renderer,
     case GSK_BLUR_NODE:
     case GSK_GL_SHADER_NODE:
     case GSK_FILL_NODE:
+    case GSK_STROKE_NODE:
     default:
       break; /* Fallback */
     }
diff --git a/gsk/gl/gskglrenderer.c b/gsk/gl/gskglrenderer.c
index ad66e3b7d4..bbf4be771b 100644
--- a/gsk/gl/gskglrenderer.c
+++ b/gsk/gl/gskglrenderer.c
@@ -3814,6 +3814,7 @@ gsk_gl_renderer_add_render_ops (GskGLRenderer   *self,
     case GSK_REPEATING_LINEAR_GRADIENT_NODE:
     case GSK_REPEATING_RADIAL_GRADIENT_NODE:
     case GSK_FILL_NODE:
+    case GSK_STROKE_NODE:
     case GSK_CAIRO_NODE:
     default:
       {
diff --git a/gsk/gskenums.h b/gsk/gskenums.h
index 141bb46797..62ecc89d70 100644
--- a/gsk/gskenums.h
+++ b/gsk/gskenums.h
@@ -74,6 +74,7 @@ typedef enum {
   GSK_CLIP_NODE,
   GSK_ROUNDED_CLIP_NODE,
   GSK_FILL_NODE,
+  GSK_STROKE_NODE,
   GSK_SHADOW_NODE,
   GSK_BLEND_NODE,
   GSK_CROSS_FADE_NODE,
diff --git a/gsk/gskrendernode.h b/gsk/gskrendernode.h
index 554360da74..4b842a2db8 100644
--- a/gsk/gskrendernode.h
+++ b/gsk/gskrendernode.h
@@ -159,6 +159,7 @@ GskRenderNode *         gsk_render_node_deserialize             (GBytes
 #define GSK_TYPE_CLIP_NODE                      (gsk_clip_node_get_type())
 #define GSK_TYPE_ROUNDED_CLIP_NODE              (gsk_rounded_clip_node_get_type())
 #define GSK_TYPE_FILL_NODE                      (gsk_fill_node_get_type())
+#define GSK_TYPE_STROKE_NODE                    (gsk_stroke_node_get_type())
 #define GSK_TYPE_SHADOW_NODE                    (gsk_shadow_node_get_type())
 #define GSK_TYPE_BLEND_NODE                     (gsk_blend_node_get_type())
 #define GSK_TYPE_CROSS_FADE_NODE                (gsk_cross_fade_node_get_type())
@@ -186,6 +187,7 @@ typedef struct _GskRepeatNode                   GskRepeatNode;
 typedef struct _GskClipNode                     GskClipNode;
 typedef struct _GskRoundedClipNode              GskRoundedClipNode;
 typedef struct _GskFillNode                     GskFillNode;
+typedef struct _GskStrokeNode                   GskStrokeNode;
 typedef struct _GskShadowNode                   GskShadowNode;
 typedef struct _GskBlendNode                    GskBlendNode;
 typedef struct _GskCrossFadeNode                GskCrossFadeNode;
@@ -458,6 +460,19 @@ GskPath *               gsk_fill_node_get_path                  (GskRenderNode
 GDK_AVAILABLE_IN_ALL
 GskFillRule             gsk_fill_node_get_fill_rule             (GskRenderNode            *node);
 
+GDK_AVAILABLE_IN_ALL
+GType                   gsk_stroke_node_get_type                (void) G_GNUC_CONST;
+GDK_AVAILABLE_IN_ALL
+GskRenderNode *         gsk_stroke_node_new                     (GskRenderNode            *child,
+                                                                 GskPath                  *path,
+                                                                 const GskStroke          *stroke);
+GDK_AVAILABLE_IN_ALL
+GskRenderNode *         gsk_stroke_node_get_child               (GskRenderNode            *node);
+GDK_AVAILABLE_IN_ALL
+GskPath *               gsk_stroke_node_get_path                (GskRenderNode            *node);
+GDK_AVAILABLE_IN_ALL
+const GskStroke *       gsk_stroke_node_get_stroke              (GskRenderNode            *node);
+
 GDK_AVAILABLE_IN_ALL
 GType                   gsk_shadow_node_get_type                (void) G_GNUC_CONST;
 GDK_AVAILABLE_IN_ALL
diff --git a/gsk/gskrendernodeimpl.c b/gsk/gskrendernodeimpl.c
index 777bbe3a14..11141dce43 100644
--- a/gsk/gskrendernodeimpl.c
+++ b/gsk/gskrendernodeimpl.c
@@ -26,6 +26,7 @@
 #include "gskpath.h"
 #include "gskrendererprivate.h"
 #include "gskroundedrectprivate.h"
+#include "gskstrokeprivate.h"
 #include "gsktransformprivate.h"
 
 #include "gdk/gdktextureprivate.h"
@@ -3855,6 +3856,168 @@ gsk_fill_node_get_fill_rule (GskRenderNode *node)
   return self->fill_rule;
 }
 
+/*** GSK_STROKE_NODE ***/
+
+struct _GskStrokeNode
+{
+  GskRenderNode render_node;
+
+  GskRenderNode *child;
+  GskPath *path;
+  GskStroke stroke;
+};
+
+static void
+gsk_stroke_node_finalize (GskRenderNode *node)
+{
+  GskStrokeNode *self = (GskStrokeNode *) node;
+  GskRenderNodeClass *parent_class = g_type_class_peek (g_type_parent (GSK_TYPE_STROKE_NODE));
+
+  gsk_render_node_unref (self->child);
+  gsk_path_unref (self->path);
+  gsk_stroke_clear (&self->stroke);
+
+  parent_class->finalize (node);
+}
+
+static void
+gsk_stroke_node_draw (GskRenderNode *node,
+                      cairo_t       *cr)
+{
+  GskStrokeNode *self = (GskStrokeNode *) node;
+
+  cairo_save (cr);
+
+  gsk_cairo_rectangle (cr, &self->child->bounds);
+  cairo_clip (cr);
+
+  cairo_push_group (cr);
+  gsk_render_node_draw (self->child, cr);
+  cairo_pop_group_to_source (cr);
+
+  gsk_stroke_to_cairo (&self->stroke, cr);
+
+  gsk_path_to_cairo (self->path, cr);
+  cairo_stroke (cr);
+
+  cairo_restore (cr);
+}
+
+static void
+gsk_stroke_node_diff (GskRenderNode  *node1,
+                    GskRenderNode  *node2,
+                    cairo_region_t *region)
+{
+  GskStrokeNode *self1 = (GskStrokeNode *) node1;
+  GskStrokeNode *self2 = (GskStrokeNode *) node2;
+
+  if (self1->path == self2->path &&
+      gsk_stroke_equal (&self1->stroke, &self2->stroke))
+    {
+      cairo_region_t *sub;
+
+      sub = cairo_region_create();
+      gsk_render_node_diff (self1->child, self2->child, sub);
+      cairo_region_union (region, sub);
+      cairo_region_destroy (sub);
+    }
+  else
+    {
+      gsk_render_node_diff_impossible (node1, node2, region);
+    }
+}
+
+/**
+ * gsk_stroke_node_new:
+ * @child: The node to stroke the area with
+ * @path: (transfer none): The path describing the area to stroke
+ * @stroke: (transfer none): The stroke attributes to use
+ *
+ * Creates a #GskRenderNode that will stroke the @child along the given
+ * @path using the attributes defined in @stroke.
+ *
+ * Returns: (transfer none) (type GskStrokeNode): A new #GskRenderNode
+ */
+GskRenderNode *
+gsk_stroke_node_new (GskRenderNode   *child,
+                     GskPath         *path,
+                     const GskStroke *stroke)
+{
+  GskStrokeNode *self;
+  GskRenderNode *node;
+
+  g_return_val_if_fail (GSK_IS_RENDER_NODE (child), NULL);
+  g_return_val_if_fail (path != NULL, NULL);
+  g_return_val_if_fail (stroke != NULL, NULL);
+
+  self = gsk_render_node_alloc (GSK_STROKE_NODE);
+  node = (GskRenderNode *) self;
+
+  self->child = gsk_render_node_ref (child);
+  self->path = gsk_path_ref (path);
+  gsk_stroke_init_copy (&self->stroke, stroke);
+
+  /* XXX: Figure out a way to compute bounds from the path */
+  graphene_rect_init_from_rect (&node->bounds, &child->bounds);
+
+  return node;
+}
+
+/**
+ * gsk_stroke_node_get_child:
+ * @node: (type GskStrokeNode): a stroke #GskRenderNode
+ *
+ * Gets the child node that is getting drawn by the given @node.
+ *
+ * Returns: (transfer none): The child that is getting drawn
+ **/
+GskRenderNode *
+gsk_stroke_node_get_child (GskRenderNode *node)
+{
+  GskStrokeNode *self = (GskStrokeNode *) node;
+
+  g_return_val_if_fail (GSK_IS_RENDER_NODE_TYPE (node, GSK_STROKE_NODE), NULL);
+
+  return self->child;
+}
+
+/**
+ * gsk_stroke_node_get_path:
+ * @node: (type GskStrokeNode): a stroke #GskRenderNode
+ *
+ * Retrievs the path that will be stroked with the contents of
+ * the @node.
+ *
+ * Returns: (transfer none): a #GskPath
+ */
+GskPath *
+gsk_stroke_node_get_path (GskRenderNode *node)
+{
+  GskStrokeNode *self = (GskStrokeNode *) node;
+
+  g_return_val_if_fail (GSK_IS_RENDER_NODE_TYPE (node, GSK_STROKE_NODE), NULL);
+
+  return self->path;
+}
+
+/**
+ * gsk_stroke_node_get_stroke:
+ * @node: (type GskStrokeNode): a stroke #GskRenderNode
+ *
+ * Retrievs the stroke attributes used in this @node.
+ *
+ * Returns: a #GskStroke
+ */
+const GskStroke *
+gsk_stroke_node_get_stroke (GskRenderNode *node)
+{
+  GskStrokeNode *self = (GskStrokeNode *) node;
+
+  g_return_val_if_fail (GSK_IS_RENDER_NODE_TYPE (node, GSK_STROKE_NODE), NULL);
+
+  return &self->stroke;
+}
+
 /*** GSK_SHADOW_NODE ***/
 
 /**
@@ -5404,6 +5567,7 @@ GSK_DEFINE_RENDER_NODE_TYPE (gsk_repeat_node, GSK_REPEAT_NODE)
 GSK_DEFINE_RENDER_NODE_TYPE (gsk_clip_node, GSK_CLIP_NODE)
 GSK_DEFINE_RENDER_NODE_TYPE (gsk_rounded_clip_node, GSK_ROUNDED_CLIP_NODE)
 GSK_DEFINE_RENDER_NODE_TYPE (gsk_fill_node, GSK_FILL_NODE)
+GSK_DEFINE_RENDER_NODE_TYPE (gsk_stroke_node, GSK_STROKE_NODE)
 GSK_DEFINE_RENDER_NODE_TYPE (gsk_shadow_node, GSK_SHADOW_NODE)
 GSK_DEFINE_RENDER_NODE_TYPE (gsk_blend_node, GSK_BLEND_NODE)
 GSK_DEFINE_RENDER_NODE_TYPE (gsk_cross_fade_node, GSK_CROSS_FADE_NODE)
@@ -5719,6 +5883,22 @@ gsk_render_node_init_types_once (void)
     gsk_render_node_types[GSK_FILL_NODE] = node_type;
   }
 
+  {
+    const GskRenderNodeTypeInfo node_info =
+    {
+      GSK_STROKE_NODE,
+      sizeof (GskStrokeNode),
+      NULL,
+      gsk_stroke_node_finalize,
+      gsk_stroke_node_draw,
+      NULL,
+      gsk_stroke_node_diff,
+    };
+
+    GType node_type = gsk_render_node_type_register_static (I_("GskStrokeNode"), &node_info);
+    gsk_render_node_types[GSK_STROKE_NODE] = node_type;
+  }
+
   {
     const GskRenderNodeTypeInfo node_info =
     {
diff --git a/gsk/gskrendernodeparser.c b/gsk/gskrendernodeparser.c
index a678e28df5..1263dd4bad 100644
--- a/gsk/gskrendernodeparser.c
+++ b/gsk/gskrendernodeparser.c
@@ -26,6 +26,7 @@
 #include "gskpath.h"
 #include "gskroundedrectprivate.h"
 #include "gskrendernodeprivate.h"
+#include "gskstroke.h"
 #include "gsktransformprivate.h"
 
 #include "gdk/gdkrgbaprivate.h"
@@ -2101,7 +2102,7 @@ append_float_param (Printer    *p,
                     float       value,
                     float       default_value)
 {
-  /* Don't approximate-compare here, better be topo verbose */
+  /* Don't approximate-compare here, better be too verbose */
   if (value == default_value)
     return;
 
@@ -2556,6 +2557,25 @@ render_node_print (Printer       *p,
       }
       break;
 
+    case GSK_STROKE_NODE:
+      {
+        const GskStroke *stroke;
+        char *path_str;
+
+        start_node (p, "stroke");
+
+        append_node_param (p, "child", gsk_stroke_node_get_child (node));
+        path_str = gsk_path_to_string (gsk_stroke_node_get_path (node));
+        append_string_param (p, "path", path_str);
+        g_free (path_str);
+
+        stroke = gsk_stroke_node_get_stroke (node);
+        append_float_param (p, "line-width", gsk_stroke_get_line_width (stroke), 0.0);
+
+        end_node (p);
+      }
+      break;
+
     case GSK_TRANSFORM_NODE:
       {
         GskTransform *transform = gsk_transform_node_get_transform (node);
diff --git a/gsk/vulkan/gskvulkanrenderpass.c b/gsk/vulkan/gskvulkanrenderpass.c
index 253157ac5d..d403c0c5b6 100644
--- a/gsk/vulkan/gskvulkanrenderpass.c
+++ b/gsk/vulkan/gskvulkanrenderpass.c
@@ -261,6 +261,7 @@ gsk_vulkan_render_pass_add_node (GskVulkanRenderPass           *self,
     case GSK_REPEATING_RADIAL_GRADIENT_NODE:
     case GSK_CONIC_GRADIENT_NODE:
     case GSK_FILL_NODE:
+    case GSK_STROKE_NODE:
     default:
       FALLBACK ("Unsupported node '%s'", g_type_name_from_instance ((GTypeInstance *) node));
 
diff --git a/gtk/inspector/recorder.c b/gtk/inspector/recorder.c
index 3fc884884a..7f1824c561 100644
--- a/gtk/inspector/recorder.c
+++ b/gtk/inspector/recorder.c
@@ -164,6 +164,9 @@ create_list_model_for_render_node (GskRenderNode *node)
     case GSK_FILL_NODE:
       return create_render_node_list_model ((GskRenderNode *[1]) { gsk_fill_node_get_child (node) }, 1);
 
+    case GSK_STROKE_NODE:
+      return create_render_node_list_model ((GskRenderNode *[1]) { gsk_stroke_node_get_child (node) }, 1);
+
     case GSK_SHADOW_NODE:
       return create_render_node_list_model ((GskRenderNode *[1]) { gsk_shadow_node_get_child (node) }, 1);
 
@@ -287,6 +290,8 @@ node_type_name (GskRenderNodeType type)
       return "Rounded Clip";
     case GSK_FILL_NODE:
       return "Fill";
+    case GSK_STROKE_NODE:
+      return "Stroke";
     case GSK_SHADOW_NODE:
       return "Shadow";
     case GSK_BLEND_NODE:
@@ -327,6 +332,7 @@ node_name (GskRenderNode *node)
     case GSK_CLIP_NODE:
     case GSK_ROUNDED_CLIP_NODE:
     case GSK_FILL_NODE:
+    case GSK_STROKE_NODE:
     case GSK_SHADOW_NODE:
     case GSK_BLEND_NODE:
     case GSK_CROSS_FADE_NODE:
@@ -581,6 +587,20 @@ add_float_row (GtkListStore  *store,
   g_free (text);
 }
 
+static const char *
+enum_to_nick (GType type,
+              int   value)
+{
+  GEnumClass *class;
+  GEnumValue *v;
+
+  class = g_type_class_ref (type);
+  v = g_enum_get_value (class, value);
+  g_type_class_unref (class);
+
+  return v->value_nick;
+}
+
 static void
 populate_render_node_properties (GtkListStore  *store,
                                  GskRenderNode *node)
@@ -843,9 +863,7 @@ populate_render_node_properties (GtkListStore  *store,
     case GSK_BLEND_NODE:
       {
         GskBlendMode mode = gsk_blend_node_get_blend_mode (node);
-        tmp = g_enum_to_string (GSK_TYPE_BLEND_MODE, mode);
-        add_text_row (store, "Blendmode", tmp);
-        g_free (tmp);
+        add_text_row (store, "Blendmode", enum_to_nick (GSK_TYPE_BLEND_MODE, mode));
       }
       break;
 
@@ -1081,10 +1099,33 @@ populate_render_node_properties (GtkListStore  *store,
     case GSK_FILL_NODE:
       {
         GskPath *path = gsk_fill_node_get_path (node);
+        GskFillRule fill_rule = gsk_fill_node_get_fill_rule (node);
+
+        tmp = gsk_path_to_string (path);
+        add_text_row (store, "Path", tmp);
+        g_free (tmp);
+
+        add_text_row (store, "Fill rule", enum_to_nick (GSK_TYPE_FILL_RULE, fill_rule));
+      }
+      break;
+
+    case GSK_STROKE_NODE:
+      {
+        GskPath *path = gsk_stroke_node_get_path (node);
+        const GskStroke *stroke = gsk_stroke_node_get_stroke (node);
+        GskLineCap line_cap = gsk_stroke_get_line_cap (stroke);
+        GskLineJoin line_join = gsk_stroke_get_line_join (stroke);
 
         tmp = gsk_path_to_string (path);
         add_text_row (store, "Path", tmp);
         g_free (tmp);
+
+        tmp = g_strdup_printf ("%.2f", gsk_stroke_get_line_width (stroke));
+        add_text_row (store, "Line width", tmp);
+        g_free (tmp);
+
+        add_text_row (store, "Line cap", enum_to_nick (GSK_TYPE_LINE_CAP, line_cap));
+        add_text_row (store, "Line join", enum_to_nick (GSK_TYPE_LINE_JOIN, line_join));
       }
       break;
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