Hook in rough distance field support for fonts

third_party/edtaa/edtaa3.h

+/* 
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ THE SOFTWARE.
+ */
+
+#define EDTAA_UNSIGNED_CHAR_INPUT 1
+
+namespace EDTAA {
+
+#if EDTAA_UNSIGNED_CHAR_INPUT
+typedef unsigned char EdtaaImageType;
+#else
+typedef double EdtaaImageType;
+#endif
+
+void computegradient(EdtaaImageType *img, int w, int h, double *gx, double *gy);
+void edtaa3(EdtaaImageType *img, double *gx, double *gy, int w, int h, 
+                   short *distx, short *disty, double *dist);
+
+}