Added ability for multiple images to be imported as an atlas

This adds support for groups in the import system, which point to a single file.
Add property hint for saving files in file field

1 files changed, 45 insertions, 0 deletions

diff --git a/editor/editor_atlas_packer.h b/editor/editor_atlas_packer.h
new file mode 100644
index 0000000000..dd9caa340e
--- /dev/null
+++ b/editor/editor_atlas_packer.h
@@ -0,0 +1,45 @@
+#ifndef EDITOR_ATLAS_PACKER_H
+#define EDITOR_ATLAS_PACKER_H
+
+#include "core/math/vector2.h"
+
+#include "core/vector.h"
+#include "scene/resources/bit_map.h"
+
+class EditorAtlasPacker {
+public:
+	struct Chart {
+		Vector<Vector2> vertices;
+		struct Face {
+			int vertex[3];
+		};
+		Vector<Face> faces;
+		bool can_transpose;
+
+		Vector2 final_offset;
+		bool transposed;
+	};
+
+private:
+	struct PlottedBitmap {
+		int chart_index;
+		Vector2i offset;
+		int area;
+		Vector<int> top_heights;
+		Vector<int> bottom_heights;
+		bool transposed;
+
+		Vector2 final_pos;
+
+		bool operator<(const PlottedBitmap &p_bm) const {
+			return area > p_bm.area;
+		}
+	};
+
+	static void _plot_triangle(Ref<BitMap> p_bitmap, Vector2i *vertices);
+
+public:
+	static void chart_pack(Vector<Chart> &charts, int &r_width, int &r_height, int p_atlas_max_size = 2048, int p_cell_resolution = 4);
+};
+
+#endif // EDITOR_ATLAS_PACKER_H