GPencil: New modules for Import and Export

This patch adds support to export and import grease pencil in several formats.

Inlude:

* Export SVG
* Export PDF (always from camera view)

* Import SVG

The import and export only support solid colors and not gradients or textures.

Requires libharu and pugixml.

For importing SVG, the NanoSVG lib is used, but this does not require installation (just a .h file embedded in the project  folder)

Example of PDF export: https://youtu.be/BMm0KeMJsI4

Reviewed By: #grease_pencil, HooglyBoogly

Maniphest Tasks: T83190, T79875, T83191, T83192

Differential Revision: https://developer.blender.org/D10482

1 files changed, 15 insertions, 0 deletions

diff --git a/source/blender/editors/gpencil/gpencil_utils.c b/source/blender/editors/gpencil/gpencil_utils.c
index 5c041134a74..574670de7ca 100644
--- a/source/blender/editors/gpencil/gpencil_utils.c
+++ b/source/blender/editors/gpencil/gpencil_utils.c
@@ -596,6 +596,21 @@ bool ED_gpencil_stroke_material_editable(Object *ob, const bGPDlayer *gpl, const
   return true;
 }
 
+/* Check whether given stroke is visible for the current material. */
+bool ED_gpencil_stroke_material_visible(Object *ob, const bGPDstroke *gps)
+{
+  /* check if the color is editable */
+  MaterialGPencilStyle *gp_style = BKE_gpencil_material_settings(ob, gps->mat_nr + 1);
+
+  if (gp_style != NULL) {
+    if (gp_style->flag & GP_MATERIAL_HIDE) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
 /* ******************************************************** */
 /* Space Conversion */