1 files changed, 58 insertions, 0 deletions
diff --git a/src/3rdparty/autotrace/pxl-outline.h b/src/3rdparty/autotrace/pxl-outline.h
new file mode 100644
index 0000000..e00d802
--- /dev/null
+++ b/src/3rdparty/autotrace/pxl-outline.h
@@ -0,0 +1,58 @@
+/* pxl-outline.h: find a list of outlines which make up one character. */
+
+#ifndef PXL_OUTLINE_H
+#define PXL_OUTLINE_H
+
+#include "autotrace.h"
+#include "exception.h"
+#include "bitmap.h"
+#include "color.h"
+
+/* This is a list of contiguous points on the bitmap.  */
+typedef struct {
+  at_coord *data;
+  unsigned length;
+  gboolean clockwise;
+  at_color color;
+  gboolean open;
+} pixel_outline_type;
+
+/* The Nth coordinate in the list.  */
+#define O_COORDINATE(p_o, n) ((p_o).data[n])
+
+/* The length of the list.  */
+#define O_LENGTH(p_o) ((p_o).length)
+
+/* Whether the outline moves clockwise or counterclockwise.  */
+#define O_CLOCKWISE(p_o) ((p_o).clockwise)
+
+/* Since a pixel outline is cyclic, the index of the next coordinate
+   after the last is the first, and the previous coordinate before the
+   first is the last.  */
+#define O_NEXT(p_o, n) (((n) + 1) % O_LENGTH (p_o))
+#define O_PREV(p_o, n) ((n) == 0				\
+                         ? O_LENGTH (p_o) - 1			\
+                         : (n) - 1)
+
+/* And the character turns into a list of such lists.  */
+typedef struct {
+  pixel_outline_type *data;
+  unsigned length;
+} pixel_outline_list_type;
+
+/* The Nth list in the list of lists.  */
+#define O_LIST_OUTLINE(p_o_l, n) ((p_o_l).data[n])
+
+/* The length of the list of lists.  */
+#define O_LIST_LENGTH(p_o_l) ((p_o_l).length)
+
+/* Find all pixels on the outline in the character C.  */
+extern pixel_outline_list_type find_outline_pixels(at_bitmap * bitmap, at_color * bg_color, at_progress_func notify_progress, gpointer progress_data, at_testcancel_func test_cancel, gpointer testcancel_data, at_exception_type * exp);
+
+/* Find all pixels on the center line of the character C.  */
+extern pixel_outline_list_type find_centerline_pixels(at_bitmap * bitmap, at_color bg_color, at_progress_func notify_progress, gpointer progress_data, at_testcancel_func test_cancel, gpointer testcancel_data, at_exception_type * exp);
+
+/* Free the memory in the list.  */
+extern void free_pixel_outline_list(pixel_outline_list_type *);
+
+#endif /* not PXL_OUTLINE_H */