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git-svn-id: http://svn.code.sf.net/p/netpbm/code/trunk@1 9d0c8265-081b-0410-96cb-a4ca84ce46f8

1 files changed, 79 insertions, 0 deletions

diff --git a/converter/other/pamtosvg/pxl-outline.h b/converter/other/pamtosvg/pxl-outline.h
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+++ b/converter/other/pamtosvg/pxl-outline.h
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+/* pxl-outline.h: find a list of outlines which make up one character. */
+
+#ifndef PXL_OUTLINE_H
+#define PXL_OUTLINE_H
+
+#include "ppm.h"
+
+#include "autotrace.h"
+#include "exception.h"
+#include "bitmap.h"
+
+/* This is a list of contiguous points on the bitmap.  */
+typedef struct
+{
+  pm_pixelcoord * data;
+  unsigned length;
+  bool clockwise;
+  pixel color;
+  bool 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.  */
+pixel_outline_list_type
+find_outline_pixels (bitmap_type         const type,
+                     bool                const bg_spec,
+                     pixel               const bg_color, 
+                     at_progress_func          notify_progress,
+                     void *              const progress_data,
+                     at_testcancel_func        test_cancel,
+                     void *              const testcancel_data,
+                     at_exception_type * const exp);
+
+/* Find all pixels on the center line of the character C.  */
+pixel_outline_list_type
+find_centerline_pixels (bitmap_type         const type,
+                        pixel               const bg_color, 
+                        at_progress_func          notify_progress,
+                        void *              const progress_data,
+                        at_testcancel_func        test_cancel,
+                        void *              const testcancel_data,
+                        at_exception_type * const exp);
+
+/* Free the memory in the list.  */
+extern void
+free_pixel_outline_list (pixel_outline_list_type *);
+
+#endif /* not PXL_OUTLINE_H */