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, 1 deletions

diff --git a/source/blender/blenkernel/BKE_gpencil_geom.h b/source/blender/blenkernel/BKE_gpencil_geom.h
index 89a794f2df3..a9bd0a524c4 100644
--- a/source/blender/blenkernel/BKE_gpencil_geom.h
+++ b/source/blender/blenkernel/BKE_gpencil_geom.h
@@ -27,10 +27,10 @@
 extern "C" {
 #endif
 
-struct BoundBox;
 struct Depsgraph;
 struct Main;
 struct Object;
+struct RegionView3D;
 struct Scene;
 struct bGPDcurve;
 struct bGPDframe;
@@ -173,6 +173,20 @@ void BKE_gpencil_stroke_uniform_subdivide(struct bGPdata *gpd,
                                           const uint32_t target_number,
                                           const bool select);
 
+void BKE_gpencil_stroke_to_view_space(struct RegionView3D *rv3d,
+                                      struct bGPDstroke *gps,
+                                      const float diff_mat[4][4]);
+void BKE_gpencil_stroke_from_view_space(struct RegionView3D *rv3d,
+                                        struct bGPDstroke *gps,
+                                        const float diff_mat[4][4]);
+struct bGPDstroke *BKE_gpencil_stroke_perimeter_from_view(struct RegionView3D *rv3d,
+                                                          struct bGPdata *gpd,
+                                                          const struct bGPDlayer *gpl,
+                                                          struct bGPDstroke *gps,
+                                                          const int subdivisions,
+                                                          const float diff_mat[4][4]);
+float BKE_gpencil_stroke_average_pressure_get(struct bGPDstroke *gps);
+bool BKE_gpencil_stroke_is_pressure_constant(struct bGPDstroke *gps);
 #ifdef __cplusplus
 }
 #endif