Freestyle: Built-in SVG exporter.

Features:
* Both still image and animation rendering, as well as polygon
  fills are supported.
* The exporter creates a new SVG layer for every Freestyle line
  set. The different layers are correctly sorted.
* SVG paths use data from line styles, so the base color of a
  line style becomes the color of paths, idem for dashes and
  stroke thickness.
* Strokes can be split at invisible parts.  This functionality is
  useful when exporting for instance dashed lines or line styles
  with a Blue Print shader
* The exporter can be used not only in the Parameter Editor mode,
  but also from within style modules written for the Python
  Scripting mode.

Acknowledgements:
The author would like to thank Francesco Fantoni and Jarno
Leppänen for their [[ https://github.com/hvfrancesco/freestylesvg | Freestyle SVG exporter ]].

Differential revision: https://developer.blender.org/D785

Author: flokkievids (Folkert de Vries)

Reviewed by: kjym3 (Tamito Kajiyama)

5 files changed, 67 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/scene.c b/source/blender/blenkernel/intern/scene.c
index 5bfd6e8a120..bec42809cd8 100644
--- a/source/blender/blenkernel/intern/scene.c
+++ b/source/blender/blenkernel/intern/scene.c
@@ -467,6 +467,9 @@ Scene *BKE_scene_add(Main *bmain, const char *name)
 	sce->r.posthue = 0.0;
 	sce->r.postsat = 1.0;
 
+	/* Freestyle SVG Export */
+	sce->r.svg_mode = FREESTYLE_CONTROL_SVG_FRAME;
+
 	sce->r.bake_mode = 1;    /* prevent to include render stuff here */
 	sce->r.bake_filter = 16;
 	sce->r.bake_osa = 5;
diff --git a/source/blender/blenloader/intern/versioning_270.c b/source/blender/blenloader/intern/versioning_270.c
index bd1b5f2c269..86556707e6f 100644
--- a/source/blender/blenloader/intern/versioning_270.c
+++ b/source/blender/blenloader/intern/versioning_270.c
@@ -435,4 +435,17 @@ void blo_do_versions_270(FileData *fd, Library *UNUSED(lib), Main *main)
 			}
 		}
 	}
+
+	// uncomment when commiting
+		/*
+		if (!MAIN_VERSION_ATLEAST(main, 273, 0)) {
+			Scene *scene;
+
+			for (scene = main->scene.first; scene; scene = scene->id.next) {
+				scene->r.svg_mode = FREESTYLE_CONTROL_SVG_FRAME;
+			}
+		}
+	*/
+
+
 }
diff --git a/source/blender/blenloader/intern/versioning_defaults.c b/source/blender/blenloader/intern/versioning_defaults.c
index 1afcac313a2..cfe90fe042c 100644
--- a/source/blender/blenloader/intern/versioning_defaults.c
+++ b/source/blender/blenloader/intern/versioning_defaults.c
@@ -76,6 +76,7 @@ void BLO_update_defaults_startup_blend(Main *bmain)
 	for (scene = bmain->scene.first; scene; scene = scene->id.next) {
 		scene->r.im_format.planes = R_IMF_PLANES_RGBA;
 		scene->r.im_format.compress = 15;
+		scene->r.svg_mode = FREESTYLE_CONTROL_SVG_FRAME;
 
 		for (srl = scene->r.layers.first; srl; srl = srl->next) {
 			srl->freestyleConfig.sphere_radius = 0.1f;
diff --git a/source/blender/makesdna/DNA_scene_types.h b/source/blender/makesdna/DNA_scene_types.h
index f8f962107f6..04a9291ba67 100644
--- a/source/blender/makesdna/DNA_scene_types.h
+++ b/source/blender/makesdna/DNA_scene_types.h
@@ -600,6 +600,11 @@ typedef struct RenderData {
 	int line_thickness_mode;
 	float unit_line_thickness; /* in pixels */
 
+	/* Freestyle SVG Export */
+	char svg_path[1024]; /* 1024 = FILE_MAX */
+	int svg_mode;
+	int svg_flag;
+
 	/* render engine */
 	char engine[32];
 
@@ -610,6 +615,15 @@ typedef struct RenderData {
 	int pad;
 } RenderData;
 
+/* RenderData::svg_flag */
+#define FREESTYLE_SVG_EXPORT                (1 << 0)
+#define FREESTYLE_SVG_SPLIT_AT_INVISIBLE    (1 << 1)
+#define FREESTYLE_SVG_OBJECT_FILL           (1 << 2)
+
+/* RenderData::svg_mode */
+#define FREESTYLE_CONTROL_SVG_FRAME      1
+#define FREESTYLE_CONTROL_SVG_ANIMATION  2
+
 /* *************************************************************** */
 /* Render Conversion/Simplfication Settings */
 
diff --git a/source/blender/makesrna/intern/rna_scene.c b/source/blender/makesrna/intern/rna_scene.c
index 70ce87ab68b..665779c03e9 100644
--- a/source/blender/makesrna/intern/rna_scene.c
+++ b/source/blender/makesrna/intern/rna_scene.c
@@ -4330,6 +4330,13 @@ static void rna_def_scene_render_data(BlenderRNA *brna)
 		{R_OUTPUT_NONE, "NONE", 0, "Keep UI", "Images are rendered without forcing UI changes"},
 		{0, NULL, 0, NULL, NULL}
 	};
+
+	/* Freestyle SVG export */
+	static EnumPropertyItem freestyle_ui_svg_mode_items[] = {
+		{FREESTYLE_CONTROL_SVG_FRAME, "FRAME", 0, "Frame", "Write a single frame to the SVG file"},
+		{FREESTYLE_CONTROL_SVG_ANIMATION, "ANIMATION", 0, "Animation", "Write an animation to the SVG file"},
+		{0, NULL, 0, NULL, NULL}
+	};
 	
 	/* Bake */
 	static EnumPropertyItem bake_mode_items[] = {
@@ -4860,6 +4867,35 @@ static void rna_def_scene_render_data(BlenderRNA *brna)
 	                         "Note: affects indirectly rendered scenes)");
 	RNA_def_property_update(prop, NC_SCENE | ND_RENDER_OPTIONS, NULL);
 
+	prop = RNA_def_property(srna, "use_svg_export", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "svg_flag", FREESTYLE_SVG_EXPORT);
+	RNA_def_property_ui_text(prop, "SVG export",
+	                         "Export the freestyle view map to the given location");
+	RNA_def_property_update(prop, NC_SCENE | ND_RENDER_OPTIONS, "rna_Scene_freestyle_update");
+
+	prop = RNA_def_property(srna, "svg_split_at_invisible", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "svg_flag", FREESTYLE_SVG_SPLIT_AT_INVISIBLE);
+	RNA_def_property_ui_text(prop, "Split at Invisible",
+	                         "Start a new SVG path when encountering an invisible stroke vertex");
+	RNA_def_property_update(prop, NC_SCENE | ND_RENDER_OPTIONS, "rna_Scene_freestyle_update");
+
+	prop = RNA_def_property(srna, "svg_use_object_fill", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "svg_flag", FREESTYLE_SVG_OBJECT_FILL);
+	RNA_def_property_ui_text(prop, "Object Fill",
+	                         "Fill surface patches within contours (doesn't always work as expected)");
+	RNA_def_property_update(prop, NC_SCENE | ND_RENDER_OPTIONS, "rna_Scene_freestyle_update");
+
+	prop = RNA_def_property(srna, "svg_path", PROP_STRING, PROP_FILEPATH);
+	RNA_def_property_string_sdna(prop, NULL, "svg_path");
+	RNA_def_property_ui_text(prop, "SVG Output Path", "Path to store the svg ouput");
+	RNA_def_property_update(prop, NC_SCENE | ND_RENDER_OPTIONS, "rna_Scene_freestyle_update");
+
+	prop = RNA_def_property(srna, "svg_mode", PROP_ENUM, PROP_NONE);
+	RNA_def_property_enum_sdna(prop, NULL, "svg_mode");
+	RNA_def_property_enum_items(prop, freestyle_ui_svg_mode_items);
+	RNA_def_property_ui_text(prop, "SVG Export Mode", "Select the SVG export mode");
+	RNA_def_property_update(prop, NC_SCENE | ND_RENDER_OPTIONS, "rna_Scene_freestyle_update");
+
 	/* Bake */
 	
 	prop = RNA_def_property(srna, "bake_type", PROP_ENUM, PROP_NONE);