[sdf] Add build infrastructure.

* src/sdf/module.mk, src/sfd/rules.mk: New files.

* src/sdf/ftsdf.h (ft_sdf_raster): New forward declaration.

* include/freetype/ftmoderr.h (FT_MODERRDEF): Add error definition
for the 'sdf' module.

* include/freetype/internal/fttrace.h (FT_TRACE_DEF): Add trace
definition for the `sdf' module.

* modules.cfg (RASTER_MODULES): Add the `sdf' module to the list of
rasterizers.

7 files changed, 106 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 0142b3b25..37e0e824d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,22 @@
 2020-08-19  Anuj Verma  <anujv@iitbhilai.ac.in>
 
+	[sdf] Add build infrastructure.
+
+	* src/sdf/module.mk, src/sfd/rules.mk: New files.
+
+	* src/sdf/ftsdf.h (ft_sdf_raster): New forward declaration.
+
+	* include/freetype/ftmoderr.h (FT_MODERRDEF): Add error definition
+	for the 'sdf' module.
+
+	* include/freetype/internal/fttrace.h (FT_TRACE_DEF): Add trace
+	definition for the `sdf' module.
+
+	* modules.cfg (RASTER_MODULES): Add the `sdf' module to the list of
+	rasterizers.
+
+2020-08-19  Anuj Verma  <anujv@iitbhilai.ac.in>
+
 	[sdf] Add interface functions for the 'sdf' rasterizer.
 
 	* src/sdf/ftsdf.c (sdf_raster_new, sdf_raster_reset,
diff --git a/include/freetype/ftmoderr.h b/include/freetype/ftmoderr.h
index f05fc53aa..fc3665158 100644
--- a/include/freetype/ftmoderr.h
+++ b/include/freetype/ftmoderr.h
@@ -171,6 +171,7 @@
   FT_MODERRDEF( Type42,   0x1400, "Type 42 module" )
   FT_MODERRDEF( Winfonts, 0x1500, "Windows FON/FNT module" )
   FT_MODERRDEF( GXvalid,  0x1600, "GX validation module" )
+  FT_MODERRDEF( Sdf,      0x1700, "Signed distance field raster module" )
 
 
 #ifdef FT_MODERR_END_LIST
diff --git a/include/freetype/internal/fttrace.h b/include/freetype/internal/fttrace.h
index 2df204512..39cdf3644 100644
--- a/include/freetype/internal/fttrace.h
+++ b/include/freetype/internal/fttrace.h
@@ -44,6 +44,7 @@ FT_TRACE_DEF( psprops )   /* PS driver properties    (ftpsprop.c) */
 FT_TRACE_DEF( raccess )   /* resource fork accessor  (ftrfork.c)  */
 FT_TRACE_DEF( raster )    /* monochrome rasterizer   (ftraster.c) */
 FT_TRACE_DEF( smooth )    /* anti-aliasing raster    (ftgrays.c)  */
+FT_TRACE_DEF( sdf )       /* signed distance raster  (ftsdf.c)    */
 FT_TRACE_DEF( synth )     /* bold/slant synthesizer  (ftsynth.c)  */
 
   /* Cache sub-system */
diff --git a/modules.cfg b/modules.cfg
index d6cdbe523..15a631b11 100644
--- a/modules.cfg
+++ b/modules.cfg
@@ -99,6 +99,9 @@ RASTER_MODULES += raster
 # Anti-aliasing rasterizer.
 RASTER_MODULES += smooth
 
+# Signed distance field rasterizer.
+RASTER_MODULES += sdf
+
 
 ####
 #### auxiliary modules
diff --git a/src/sdf/ftsdf.h b/src/sdf/ftsdf.h
index eda86d9a4..0275f516a 100644
--- a/src/sdf/ftsdf.h
+++ b/src/sdf/ftsdf.h
@@ -63,6 +63,10 @@ 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_ */
diff --git a/src/sdf/module.mk b/src/sdf/module.mk
new file mode 100644
index 000000000..978e13f13
--- /dev/null
+++ b/src/sdf/module.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
diff --git a/src/sdf/rules.mk b/src/sdf/rules.mk
new file mode 100644
index 000000000..a410d733c
--- /dev/null
+++ b/src/sdf/rules.mk
@@ -0,0 +1,64 @@
+
+
+# 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