diff --git a/thirdparty/libmypaint/README b/thirdparty/libmypaint/README
index 4b0866d..d5fb270 100644
--- a/thirdparty/libmypaint/README
+++ b/thirdparty/libmypaint/README
@@ -1,4 +1,4 @@
-Scripts for cross-build libmypaint for Windows (MinGW) under Debian 8 Jessie
+Scripts for cross-build libmypaint for Windows (MinGW) under Debian 8 Jessie and Debian 9 Stretch
 
 1. install mingw toolchain (via apt-get for ex)
 
diff --git a/thirdparty/libmypaint/dist/32/include/libmypaint/mypaint-brush-settings-gen.h b/thirdparty/libmypaint/dist/32/include/libmypaint/mypaint-brush-settings-gen.h
index 77e0932..b35812b 100644
--- a/thirdparty/libmypaint/dist/32/include/libmypaint/mypaint-brush-settings-gen.h
+++ b/thirdparty/libmypaint/dist/32/include/libmypaint/mypaint-brush-settings-gen.h
@@ -7,8 +7,13 @@ typedef enum {
     MYPAINT_BRUSH_INPUT_RANDOM,
     MYPAINT_BRUSH_INPUT_STROKE,
     MYPAINT_BRUSH_INPUT_DIRECTION,
+    MYPAINT_BRUSH_INPUT_DIRECTION_ANGLE,
+    MYPAINT_BRUSH_INPUT_ATTACK_ANGLE,
     MYPAINT_BRUSH_INPUT_TILT_DECLINATION,
     MYPAINT_BRUSH_INPUT_TILT_ASCENSION,
+    MYPAINT_BRUSH_INPUT_GRIDMAP_X,
+    MYPAINT_BRUSH_INPUT_GRIDMAP_Y,
+    MYPAINT_BRUSH_INPUT_BRUSH_RADIUS,
     MYPAINT_BRUSH_INPUT_CUSTOM,
     MYPAINT_BRUSH_INPUTS_COUNT
 } MyPaintBrushInput;
@@ -23,12 +28,23 @@ typedef enum {
     MYPAINT_BRUSH_SETTING_DABS_PER_BASIC_RADIUS,
     MYPAINT_BRUSH_SETTING_DABS_PER_ACTUAL_RADIUS,
     MYPAINT_BRUSH_SETTING_DABS_PER_SECOND,
+    MYPAINT_BRUSH_SETTING_GRIDMAP_SCALE,
+    MYPAINT_BRUSH_SETTING_GRIDMAP_SCALE_X,
+    MYPAINT_BRUSH_SETTING_GRIDMAP_SCALE_Y,
     MYPAINT_BRUSH_SETTING_RADIUS_BY_RANDOM,
     MYPAINT_BRUSH_SETTING_SPEED1_SLOWNESS,
     MYPAINT_BRUSH_SETTING_SPEED2_SLOWNESS,
     MYPAINT_BRUSH_SETTING_SPEED1_GAMMA,
     MYPAINT_BRUSH_SETTING_SPEED2_GAMMA,
     MYPAINT_BRUSH_SETTING_OFFSET_BY_RANDOM,
+    MYPAINT_BRUSH_SETTING_OFFSET_Y,
+    MYPAINT_BRUSH_SETTING_OFFSET_X,
+    MYPAINT_BRUSH_SETTING_OFFSET_ANGLE,
+    MYPAINT_BRUSH_SETTING_OFFSET_ANGLE_ASC,
+    MYPAINT_BRUSH_SETTING_OFFSET_ANGLE_2,
+    MYPAINT_BRUSH_SETTING_OFFSET_ANGLE_2_ASC,
+    MYPAINT_BRUSH_SETTING_OFFSET_ANGLE_ADJ,
+    MYPAINT_BRUSH_SETTING_OFFSET_MULTIPLIER,
     MYPAINT_BRUSH_SETTING_OFFSET_BY_SPEED,
     MYPAINT_BRUSH_SETTING_OFFSET_BY_SPEED_SLOWNESS,
     MYPAINT_BRUSH_SETTING_SLOW_TRACKING,
@@ -93,6 +109,12 @@ typedef enum {
     MYPAINT_BRUSH_STATE_DIRECTION_DY,
     MYPAINT_BRUSH_STATE_DECLINATION,
     MYPAINT_BRUSH_STATE_ASCENSION,
+    MYPAINT_BRUSH_STATE_DIRECTION_ANGLE_DX,
+    MYPAINT_BRUSH_STATE_DIRECTION_ANGLE_DY,
+    MYPAINT_BRUSH_STATE_ATTACK_ANGLE,
+    MYPAINT_BRUSH_STATE_FLIP,
+    MYPAINT_BRUSH_STATE_GRIDMAP_X,
+    MYPAINT_BRUSH_STATE_GRIDMAP_Y,
     MYPAINT_BRUSH_STATES_COUNT
 } MyPaintBrushState;
 
diff --git a/thirdparty/libmypaint/dist/32/include/libmypaint/mypaint-tiled-surface.h b/thirdparty/libmypaint/dist/32/include/libmypaint/mypaint-tiled-surface.h
index b225f7b..db01e4a 100644
--- a/thirdparty/libmypaint/dist/32/include/libmypaint/mypaint-tiled-surface.h
+++ b/thirdparty/libmypaint/dist/32/include/libmypaint/mypaint-tiled-surface.h
@@ -5,15 +5,6 @@
 #include <mypaint-surface.h>
 #include <mypaint-config.h>
 
-typedef enum {
-    MYPAINT_SYMMETRY_TYPE_VERTICAL,
-    MYPAINT_SYMMETRY_TYPE_HORIZONTAL,
-    MYPAINT_SYMMETRY_TYPE_VERTHORZ,
-    MYPAINT_SYMMETRY_TYPE_ROTATIONAL,
-    MYPAINT_SYMMETRY_TYPE_SNOWFLAKE,
-    MYPAINT_SYMMETRY_TYPES_COUNT
-} MyPaintSymmetryType;
-
 G_BEGIN_DECLS
 
 typedef struct MyPaintTiledSurface MyPaintTiledSurface;
@@ -49,10 +40,7 @@ struct MyPaintTiledSurface {
     MyPaintTileRequestStartFunction tile_request_start;
     MyPaintTileRequestEndFunction tile_request_end;
     gboolean surface_do_symmetry;
-    MyPaintSymmetryType symmetry_type;
     float surface_center_x;
-    float surface_center_y;
-    int rot_symmetry_lines;
     struct OperationQueue *operation_queue;
     MyPaintRectangle dirty_bbox;
     gboolean threadsafe_tile_requests;
@@ -68,10 +56,7 @@ void
 mypaint_tiled_surface_destroy(MyPaintTiledSurface *self);
 
 void
-mypaint_tiled_surface_set_symmetry_state(MyPaintTiledSurface *self, gboolean active,
-                                         float center_x, float center_y,
-                                         MyPaintSymmetryType symmetry_type,
-                                         int rot_symmetry_lines);
+mypaint_tiled_surface_set_symmetry_state(MyPaintTiledSurface *self, gboolean active, float center_x);
 float
 mypaint_tiled_surface_get_alpha (MyPaintTiledSurface *self, float x, float y, float radius);
 
diff --git a/thirdparty/libmypaint/dist/32/libiconv-2.dll b/thirdparty/libmypaint/dist/32/libiconv-2.dll
index 9f62fac..588763a 100755
--- a/thirdparty/libmypaint/dist/32/libiconv-2.dll
+++ b/thirdparty/libmypaint/dist/32/libiconv-2.dll
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:3078c54ef5c185ca5fe25d9dddc15a258bf46357b1951132b042ef661b2bc936
-size 1101423
+oid sha256:78ce0b0eebff5c7f704ae64523409cf86a2469611ca7b0c55ab3310ef6cae73c
+size 1309935
diff --git a/thirdparty/libmypaint/dist/32/libintl-8.dll b/thirdparty/libmypaint/dist/32/libintl-8.dll
index 59fbc5a..ddec722 100755
--- a/thirdparty/libmypaint/dist/32/libintl-8.dll
+++ b/thirdparty/libmypaint/dist/32/libintl-8.dll
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:fb73cf22089da6390c1def079b58e7b73cb27ce7902e48883f5becae20df97b2
-size 333677
+oid sha256:3e1e9a9bac8527f5db77898b2f72c44c3a61f1918e37434cd47c192d726e3219
+size 603361
diff --git a/thirdparty/libmypaint/dist/32/libjson-c-2.dll b/thirdparty/libmypaint/dist/32/libjson-c-2.dll
index 87f1866..b562fcb 100755
--- a/thirdparty/libmypaint/dist/32/libjson-c-2.dll
+++ b/thirdparty/libmypaint/dist/32/libjson-c-2.dll
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:03e90abbbc0c72b3832b7cb1fb62df3bc41d9fc170caf1eec777a69857dffd29
-size 216247
+oid sha256:abd13e4ed73e2fc3939e3517b3f9805c02a1fb9bb54189d8f89a1358aa2fd984
+size 428011
diff --git a/thirdparty/libmypaint/dist/32/libmypaint-1-4-0.dll b/thirdparty/libmypaint/dist/32/libmypaint-1-4-0.dll
index c6fc3f6..00730de 100755
--- a/thirdparty/libmypaint/dist/32/libmypaint-1-4-0.dll
+++ b/thirdparty/libmypaint/dist/32/libmypaint-1-4-0.dll
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:426748f0de42310541d59537396caf7f6e8c194b1c4481e29f5522407c4e0d32
-size 306114
+oid sha256:5b3daa24ead0959d6e9131abface32560b27d58031cc472b5183cc45fa5eaea3
+size 637598
diff --git a/thirdparty/libmypaint/dist/32/libmypaint.lib b/thirdparty/libmypaint/dist/32/libmypaint.lib
index 7537481..cc70a53 100755
--- a/thirdparty/libmypaint/dist/32/libmypaint.lib
+++ b/thirdparty/libmypaint/dist/32/libmypaint.lib
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:7c2ce3325bab78ac76de865e39276ccc35b16b053224d5d651e007a8672c59de
+oid sha256:8109a31daae0d3a55d9c64ebaa9170792f29bc7823cea6d8f9d3db130180fd60
 size 86606
diff --git a/thirdparty/libmypaint/dist/64/include/libmypaint/mypaint-brush-settings-gen.h b/thirdparty/libmypaint/dist/64/include/libmypaint/mypaint-brush-settings-gen.h
index 77e0932..b35812b 100644
--- a/thirdparty/libmypaint/dist/64/include/libmypaint/mypaint-brush-settings-gen.h
+++ b/thirdparty/libmypaint/dist/64/include/libmypaint/mypaint-brush-settings-gen.h
@@ -7,8 +7,13 @@ typedef enum {
     MYPAINT_BRUSH_INPUT_RANDOM,
     MYPAINT_BRUSH_INPUT_STROKE,
     MYPAINT_BRUSH_INPUT_DIRECTION,
+    MYPAINT_BRUSH_INPUT_DIRECTION_ANGLE,
+    MYPAINT_BRUSH_INPUT_ATTACK_ANGLE,
     MYPAINT_BRUSH_INPUT_TILT_DECLINATION,
     MYPAINT_BRUSH_INPUT_TILT_ASCENSION,
+    MYPAINT_BRUSH_INPUT_GRIDMAP_X,
+    MYPAINT_BRUSH_INPUT_GRIDMAP_Y,
+    MYPAINT_BRUSH_INPUT_BRUSH_RADIUS,
     MYPAINT_BRUSH_INPUT_CUSTOM,
     MYPAINT_BRUSH_INPUTS_COUNT
 } MyPaintBrushInput;
@@ -23,12 +28,23 @@ typedef enum {
     MYPAINT_BRUSH_SETTING_DABS_PER_BASIC_RADIUS,
     MYPAINT_BRUSH_SETTING_DABS_PER_ACTUAL_RADIUS,
     MYPAINT_BRUSH_SETTING_DABS_PER_SECOND,
+    MYPAINT_BRUSH_SETTING_GRIDMAP_SCALE,
+    MYPAINT_BRUSH_SETTING_GRIDMAP_SCALE_X,
+    MYPAINT_BRUSH_SETTING_GRIDMAP_SCALE_Y,
     MYPAINT_BRUSH_SETTING_RADIUS_BY_RANDOM,
     MYPAINT_BRUSH_SETTING_SPEED1_SLOWNESS,
     MYPAINT_BRUSH_SETTING_SPEED2_SLOWNESS,
     MYPAINT_BRUSH_SETTING_SPEED1_GAMMA,
     MYPAINT_BRUSH_SETTING_SPEED2_GAMMA,
     MYPAINT_BRUSH_SETTING_OFFSET_BY_RANDOM,
+    MYPAINT_BRUSH_SETTING_OFFSET_Y,
+    MYPAINT_BRUSH_SETTING_OFFSET_X,
+    MYPAINT_BRUSH_SETTING_OFFSET_ANGLE,
+    MYPAINT_BRUSH_SETTING_OFFSET_ANGLE_ASC,
+    MYPAINT_BRUSH_SETTING_OFFSET_ANGLE_2,
+    MYPAINT_BRUSH_SETTING_OFFSET_ANGLE_2_ASC,
+    MYPAINT_BRUSH_SETTING_OFFSET_ANGLE_ADJ,
+    MYPAINT_BRUSH_SETTING_OFFSET_MULTIPLIER,
     MYPAINT_BRUSH_SETTING_OFFSET_BY_SPEED,
     MYPAINT_BRUSH_SETTING_OFFSET_BY_SPEED_SLOWNESS,
     MYPAINT_BRUSH_SETTING_SLOW_TRACKING,
@@ -93,6 +109,12 @@ typedef enum {
     MYPAINT_BRUSH_STATE_DIRECTION_DY,
     MYPAINT_BRUSH_STATE_DECLINATION,
     MYPAINT_BRUSH_STATE_ASCENSION,
+    MYPAINT_BRUSH_STATE_DIRECTION_ANGLE_DX,
+    MYPAINT_BRUSH_STATE_DIRECTION_ANGLE_DY,
+    MYPAINT_BRUSH_STATE_ATTACK_ANGLE,
+    MYPAINT_BRUSH_STATE_FLIP,
+    MYPAINT_BRUSH_STATE_GRIDMAP_X,
+    MYPAINT_BRUSH_STATE_GRIDMAP_Y,
     MYPAINT_BRUSH_STATES_COUNT
 } MyPaintBrushState;
 
diff --git a/thirdparty/libmypaint/dist/64/include/libmypaint/mypaint-tiled-surface.h b/thirdparty/libmypaint/dist/64/include/libmypaint/mypaint-tiled-surface.h
index b225f7b..db01e4a 100644
--- a/thirdparty/libmypaint/dist/64/include/libmypaint/mypaint-tiled-surface.h
+++ b/thirdparty/libmypaint/dist/64/include/libmypaint/mypaint-tiled-surface.h
@@ -5,15 +5,6 @@
 #include <mypaint-surface.h>
 #include <mypaint-config.h>
 
-typedef enum {
-    MYPAINT_SYMMETRY_TYPE_VERTICAL,
-    MYPAINT_SYMMETRY_TYPE_HORIZONTAL,
-    MYPAINT_SYMMETRY_TYPE_VERTHORZ,
-    MYPAINT_SYMMETRY_TYPE_ROTATIONAL,
-    MYPAINT_SYMMETRY_TYPE_SNOWFLAKE,
-    MYPAINT_SYMMETRY_TYPES_COUNT
-} MyPaintSymmetryType;
-
 G_BEGIN_DECLS
 
 typedef struct MyPaintTiledSurface MyPaintTiledSurface;
@@ -49,10 +40,7 @@ struct MyPaintTiledSurface {
     MyPaintTileRequestStartFunction tile_request_start;
     MyPaintTileRequestEndFunction tile_request_end;
     gboolean surface_do_symmetry;
-    MyPaintSymmetryType symmetry_type;
     float surface_center_x;
-    float surface_center_y;
-    int rot_symmetry_lines;
     struct OperationQueue *operation_queue;
     MyPaintRectangle dirty_bbox;
     gboolean threadsafe_tile_requests;
@@ -68,10 +56,7 @@ void
 mypaint_tiled_surface_destroy(MyPaintTiledSurface *self);
 
 void
-mypaint_tiled_surface_set_symmetry_state(MyPaintTiledSurface *self, gboolean active,
-                                         float center_x, float center_y,
-                                         MyPaintSymmetryType symmetry_type,
-                                         int rot_symmetry_lines);
+mypaint_tiled_surface_set_symmetry_state(MyPaintTiledSurface *self, gboolean active, float center_x);
 float
 mypaint_tiled_surface_get_alpha (MyPaintTiledSurface *self, float x, float y, float radius);
 
diff --git a/thirdparty/libmypaint/dist/64/libiconv-2.dll b/thirdparty/libmypaint/dist/64/libiconv-2.dll
index 9585920..5be1886 100755
--- a/thirdparty/libmypaint/dist/64/libiconv-2.dll
+++ b/thirdparty/libmypaint/dist/64/libiconv-2.dll
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:4093b53b91565729564d539403aca91737ee094f902be60b6e261d78a67f0fae
-size 1157325
+oid sha256:3b94187cac17bd48b4f144d9bba611755998d9bdfcd1078a823c0010e3c8560a
+size 1362892
diff --git a/thirdparty/libmypaint/dist/64/libintl-8.dll b/thirdparty/libmypaint/dist/64/libintl-8.dll
index 3f7f8d6..60500d5 100755
--- a/thirdparty/libmypaint/dist/64/libintl-8.dll
+++ b/thirdparty/libmypaint/dist/64/libintl-8.dll
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:8eb37af030cff310ff94a43b68a16e0336af0828b62d1bd35e9e26bb2d2aad69
-size 404063
+oid sha256:2a45496ef731b54d588ec162359e5e15d408e3b1a6cd1615178c83b0baf126d2
+size 671955
diff --git a/thirdparty/libmypaint/dist/64/libjson-c-2.dll b/thirdparty/libmypaint/dist/64/libjson-c-2.dll
index 7af6fa0..0f9342d 100755
--- a/thirdparty/libmypaint/dist/64/libjson-c-2.dll
+++ b/thirdparty/libmypaint/dist/64/libjson-c-2.dll
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:1d8e9efd3f204804c88f362d20b182e3c222a025b28a811b8dc3abf627f6fd36
-size 276980
+oid sha256:01d84e22de39f5422aa41aa4e3d68b4474cfd47954209cb4bd004a55b180c57c
+size 505255
diff --git a/thirdparty/libmypaint/dist/64/libmypaint-1-4-0.dll b/thirdparty/libmypaint/dist/64/libmypaint-1-4-0.dll
index 9420a1a..cdc1fd6 100755
--- a/thirdparty/libmypaint/dist/64/libmypaint-1-4-0.dll
+++ b/thirdparty/libmypaint/dist/64/libmypaint-1-4-0.dll
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:2747ff3cd4d107bcc7ddbd73099aac91b2b5bbcd69f1839f4d79418356d667b1
-size 392455
+oid sha256:b5573a9acc5735e33ee458d575bc8d37a1e441eaeeae0d73553d6d39d854a2ae
+size 728685
diff --git a/thirdparty/libmypaint/dist/64/libmypaint.lib b/thirdparty/libmypaint/dist/64/libmypaint.lib
index fac0dfa..be146c5 100755
--- a/thirdparty/libmypaint/dist/64/libmypaint.lib
+++ b/thirdparty/libmypaint/dist/64/libmypaint.lib
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:704fc5310b5a3f0b7b77ce530f39a04b0d1c07d0cdfe26dad79159cf01f4a2a6
+oid sha256:e037b8df494cdac7850aef76632d0fe91ec2583233ca25a2394433c99ec9db98
 size 84848
diff --git a/thirdparty/libmypaint/download-all.sh b/thirdparty/libmypaint/download-all.sh
index fa95a15..8f2ff05 100755
--- a/thirdparty/libmypaint/download-all.sh
+++ b/thirdparty/libmypaint/download-all.sh
@@ -31,11 +31,11 @@ echo ""
 echo "checkout libmypaint"
 echo ""
 
-BRANCH="testing"
+BRANCH="libmypaint-v1"
 if [ -d "libmypaint/.git" ]; then
     cd libmypaint && git fetch && git reset --hard "origin/$BRANCH" && cd ..
 else
-    git clone https://github.com/blackwarthog/libmypaint.git --branch $BRANCH
+    git clone https://github.com/mypaint/libmypaint.git --branch $BRANCH
 fi
 
 cd ..
diff --git a/thirdparty/libmypaint/mingw-vars.sh b/thirdparty/libmypaint/mingw-vars.sh
index 2903331..2b9da26 100644
--- a/thirdparty/libmypaint/mingw-vars.sh
+++ b/thirdparty/libmypaint/mingw-vars.sh
@@ -64,7 +64,8 @@ export LDFLAGS="-L$PREFIX/lib $LDFLAGS"
 export CFLAGS="-I$PREFIX/include $CFLAGS"
 export CPPFLAGS="-I$PREFIX/include $CPPFLAGS"
 export CXXFLAGS="-I$PREFIX/include $CXXFLAGS"
-export PKG_CONFIG_PATH="$PREFIX/lib/pkgconfig:$PREFIX/share/pkgconfig:$PKG_CONFIG_PATH"
+export PKG_CONFIG="/usr/bin/pkg-config"
+export PKG_CONFIG_PATH="$PREFIX/lib/pkgconfig:$PREFIX/share/pkgconfig"
 export PKG_CONFIG_LIBDIR="$PREFIX/lib:$PKG_CONFIG_LIBDIR"
 export PKG_CONFIG_SYSROOT_DIR="/"
 export XDG_DATA_DIRS="$PREFIX/share:$XDG_DATA_DIRS"