[sdf] Added makefiles to build the `sdf' module.

* src/sdf/ftsdf.c (module.mk, rules.mk): Added makefiled to build the `sdf' module.

* src/sdf/ftsdf.c (ft_sdf_raster): Added forward declaration of the `sdf' rasterizer.

src/sdf/ftsdf.h

@@ -64,6 +64,9 @@ FT_BEGIN_HEADER
 
   } SDF_Raster_Params;
 
+  /* rasterizer to convert outline to SDF */
+  FT_EXPORT_VAR( const FT_Raster_Funcs ) ft_sdf_raster;
+
 FT_END_HEADER
 
 #endif /* FTSDF_H_ */

src/sdf/module.mk

@@ -0,0 +1,63 @@
+
+
+# sdf driver directory
+#
+SDF_DIR := $(SRC_DIR)/sdf
+
+
+# compilation flags for the driver
+#
+SDF_COMPILE := $(CC) $(ANSIFLAGS)                            \
+                     $I$(subst /,$(COMPILER_SEP),$(SDF_DIR)) \
+                     $(INCLUDE_FLAGS)                        \
+                     $(FT_CFLAGS)
+
+
+# sdf driver sources (i.e., C files)
+#
+SDF_DRV_SRC := $(SDF_DIR)/ftsdfrend.c  \
+               $(SDF_DIR)/ftsdf.c      \
+               $(SDF_DIR)/ftbsdf.c
+
+
+# sdf driver headers
+#
+SDF_DRV_H := $(SDF_DIR)/ftsdfrend.h  \
+             $(SDF_DIR)/ftsdf.h      \
+             $(SDF_DIR)/ftsdferrs.h  \
+             $(SDF_DIR)/ftsdfcommon.h
+
+
+# sdf driver object(s)
+#
+#   SDF_DRV_OBJ_M is used during `multi' builds.
+#   SDF_DRV_OBJ_S is used during `single' builds.
+#
+SDF_DRV_OBJ_M := $(SDF_DRV_SRC:$(SDF_DIR)/%.c=$(OBJ_DIR)/%.$O)
+SDF_DRV_OBJ_S := $(OBJ_DIR)/sdf.$O
+
+
+# sdf driver source file for single build
+#
+SDF_DRV_SRC_S := $(SDF_DIR)/sdf.c
+
+
+# sdf driver - single object
+#
+$(SDF_DRV_OBJ_S): $(SDF_DRV_SRC_S) $(SDF_DRV_SRC) \
+                  $(FREETYPE_H) $(SDF_DRV_H)
+	$(SDF_COMPILE) $T$(subst /,$(COMPILER_SEP),$@ $(SDF_DRV_SRC_S))
+
+
+# sdf driver - multiple objects
+#
+$(OBJ_DIR)/%.$O: $(SDF_DIR)/%.c $(FREETYPE_H) $(SDF_DRV_H)
+	$(SDF_COMPILE) $T$(subst /,$(COMPILER_SEP),$@ $<)
+
+
+# update main driver list
+#
+DRV_OBJS_S += $(SDF_DRV_OBJ_S)
+DRV_OBJS_M += $(SDF_DRV_OBJ_M)
+
+# EOF

src/sdf/rules.mk

@@ -0,0 +1,16 @@
+
+
+FTMODULE_H_COMMANDS += SDF_RENDERER
+FTMODULE_H_COMMANDS += BSDF_RENDERER
+
+define SDF_RENDERER
+$(OPEN_DRIVER) FT_Renderer_Class, ft_sdf_renderer_class $(CLOSE_DRIVER)
+$(ECHO_DRIVER)sdf       $(ECHO_DRIVER_DESC)signed distance field renderer$(ECHO_DRIVER_DONE)
+endef
+
+define BSDF_RENDERER
+$(OPEN_DRIVER) FT_Renderer_Class, ft_bitmap_sdf_renderer_class $(CLOSE_DRIVER)
+$(ECHO_DRIVER)bsdf      $(ECHO_DRIVER_DESC)bitmap to signed distance field converter$(ECHO_DRIVER_DONE)
+endef
+
+#EOF