[sdfb] Added new module to generate SDF from bitmap.

* src/sdfb/sdfb.c, src/sdfb/ftsdfbrend.c,
  src/sdfb/ftsdfb.c, src/sdfb/ftsdfbrend.h,
  src/sdfb/ftsdfb.h, src/sdfb/ftsdfberrs.h:
  Added files required by the `sdfb' renderer module.

* src/sdfb/rules.mk, src/sdfb/module.mk: Added
  files required to build the `sdfb' module using
  the default build system.

* CMakeLists.txt (BASE_SRCS): Add `src/sdfb/sdfb.c'
  to the variable.

* include/freetype/config/ftmodule.h: Added `sdfb'
  module declaration so that the module can be compiled
  when not compiling with GNU make.

* modules.cfg (RASTER_MODULES): Include `sdfb' module
  to the default rasterizer module list.

* include/freetype/ftmoderr.h: sdfb module error define

* src/sdf/rules.mk: Add EOF.

14 files changed, 231 insertions, 0 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index aa6360258..93d5506ed 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -348,6 +348,7 @@ set(BASE_SRCS
   src/psnames/psnames.c
   src/raster/raster.c
   src/sdf/sdf.c
+  src/sdfb/sdfb.c
   src/sfnt/sfnt.c
   src/smooth/smooth.c
   src/truetype/truetype.c
diff --git a/[GSoC]ChangeLog b/[GSoC]ChangeLog
index 7a2f7c2fa..19f339271 100644
--- a/[GSoC]ChangeLog
+++ b/[GSoC]ChangeLog
@@ -1,5 +1,32 @@
 2020-07-17  Anuj Verma  <anujv@iitbhilai.ac.in>
 
+	[sdfb] Added new module to generate SDF from bitmap.
+
+	* src/sdfb/sdfb.c, src/sdfb/ftsdfbrend.c,
+	  src/sdfb/ftsdfb.c, src/sdfb/ftsdfbrend.h,
+	  src/sdfb/ftsdfb.h, src/sdfb/ftsdfberrs.h:
+	  Added files required by the `sdfb' renderer module.
+
+	* src/sdfb/rules.mk, src/sdfb/module.mk: Added
+	  files required to build the `sdfb' module using
+	  the default build system.
+
+	* CMakeLists.txt (BASE_SRCS): Add `src/sdfb/sdfb.c'
+	  to the variable.
+
+	* include/freetype/config/ftmodule.h: Added `sdfb'
+	  module declaration so that the module can be compiled 
+	  when not compiling with GNU make.
+
+	* modules.cfg (RASTER_MODULES): Include `sdfb' module
+	  to the default rasterizer module list.
+
+	* include/freetype/ftmoderr.h: sdfb module error define
+
+	* src/sdf/rules.mk: Add EOF.
+
+2020-07-17  Anuj Verma  <anujv@iitbhilai.ac.in>
+
 	[sdf] Added memory tracker.
 
 	* src/sdf/ftsdf.c (SDF_MemoryUser): Added struct
diff --git a/include/freetype/config/ftmodule.h b/include/freetype/config/ftmodule.h
index 81b665526..839a115d2 100644
--- a/include/freetype/config/ftmodule.h
+++ b/include/freetype/config/ftmodule.h
@@ -27,5 +27,6 @@ FT_USE_MODULE( FT_Module_Class, sfnt_module_class )
 FT_USE_MODULE( FT_Renderer_Class, ft_smooth_renderer_class )
 FT_USE_MODULE( FT_Driver_ClassRec, bdf_driver_class )
 FT_USE_MODULE( FT_Renderer_Class, ft_sdf_renderer_class )
+FT_USE_MODULE( FT_Renderer_Class, ft_sdfb_renderer_class )
 
 /* EOF */
diff --git a/include/freetype/ftmoderr.h b/include/freetype/ftmoderr.h
index b2c7d609e..dbbf6acc1 100644
--- a/include/freetype/ftmoderr.h
+++ b/include/freetype/ftmoderr.h
@@ -172,6 +172,7 @@
   FT_MODERRDEF( Winfonts, 0x1500, "Windows FON/FNT module" )
   FT_MODERRDEF( GXvalid,  0x1600, "GX validation module" )
   FT_MODERRDEF( Sdf,      0x1700, "signed distance field raster module" )
+  FT_MODERRDEF( Sdfb,     0x1700, "signed distance field converter module" )
 
 
 #ifdef FT_MODERR_END_LIST
diff --git a/modules.cfg b/modules.cfg
index d64c5ff08..5673e8700 100644
--- a/modules.cfg
+++ b/modules.cfg
@@ -103,6 +103,18 @@ RASTER_MODULES += smooth
 RASTER_MODULES += sdf
 
 ####
+#### post processing modules -- for doing post processing on bitmaps
+####
+
+# Currently there is no seperate list for post processing modules
+# so we simply use the `RASTER_MODULES' list.
+
+# Signed distance field generator. This one uses bitmaps
+# to generate SDF unlike the `sdf' module which require
+# outlines.
+RASTER_MODULES += sdfb
+
+####
 #### auxiliary modules
 ####
 
diff --git a/src/sdf/rules.mk b/src/sdf/rules.mk
index efc8ac53e..214725eae 100644
--- a/src/sdf/rules.mk
+++ b/src/sdf/rules.mk
@@ -56,3 +56,5 @@ $(OBJ_DIR)/%.$O: $(SDF_DIR)/%.c $(FREETYPE_H) $(SDF_DRV_H)
 #
 DRV_OBJS_S += $(SDF_DRV_OBJ_S)
 DRV_OBJS_M += $(SDF_DRV_OBJ_M)
+
+# EOF
diff --git a/src/sdfb/ftsdfb.c b/src/sdfb/ftsdfb.c
new file mode 100644
index 000000000..7caf1e6b6
--- /dev/null
+++ b/src/sdfb/ftsdfb.c
@@ -0,0 +1,2 @@
+

+/* END */

diff --git a/src/sdfb/ftsdfb.h b/src/sdfb/ftsdfb.h
new file mode 100644
index 000000000..7caf1e6b6
--- /dev/null
+++ b/src/sdfb/ftsdfb.h
@@ -0,0 +1,2 @@
+

+/* END */

diff --git a/src/sdfb/ftsdfberrs.h b/src/sdfb/ftsdfberrs.h
new file mode 100644
index 000000000..1a78e459a
--- /dev/null
+++ b/src/sdfb/ftsdfberrs.h
@@ -0,0 +1,18 @@
+
+#ifndef FTSDFBERRS_H_
+#define FTSDFBERRS_H_
+
+#include <freetype/ftmoderr.h>
+
+#undef FTERRORS_H_
+
+#undef  FT_ERR_PREFIX
+#define FT_ERR_PREFIX  Sdfb_Err_
+#define FT_ERR_BASE    FT_Mod_Err_Sdfb
+
+#include <freetype/fterrors.h>
+
+#endif /* FTSDFBERRS_H_ */
+
+
+/* END */
diff --git a/src/sdfb/ftsdfbrend.c b/src/sdfb/ftsdfbrend.c
new file mode 100644
index 000000000..c0051113d
--- /dev/null
+++ b/src/sdfb/ftsdfbrend.c
@@ -0,0 +1,43 @@
+

+#include "ftsdfbrend.h"

+

+#include "ftsdfberrs.h"

+

+  /**************************************************************************

+   *

+   * The macro FT_COMPONENT is used in trace mode.  It is an implicit

+   * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log

+   * messages during execution.

+   */

+  #undef  FT_COMPONENT

+  #define FT_COMPONENT  sdfb

+

+  

+

+  FT_DEFINE_RENDERER(

+    ft_sdfb_renderer_class,

+

+    FT_MODULE_RENDERER,

+    sizeof( SDFB_Renderer_Module ),

+

+    "sdfb",

+    0x10000L,

+    0x20000L,

+

+    NULL,

+

+    (FT_Module_Constructor) NULL,

+    (FT_Module_Destructor)  NULL,

+    (FT_Module_Requester)   NULL,

+

+    FT_GLYPH_FORMAT_BITMAP,

+

+    (FT_Renderer_RenderFunc)    NULL,  /* render_glyph    */

+    (FT_Renderer_TransformFunc) NULL,  /* transform_glyph */

+    (FT_Renderer_GetCBoxFunc)   NULL,  /* get_glyph_cbox  */

+    (FT_Renderer_SetModeFunc)   NULL,  /* set_mode        */

+

+    (FT_Raster_Funcs*) NULL            /* raster_class    */

+  )

+

+/* END */

diff --git a/src/sdfb/ftsdfbrend.h b/src/sdfb/ftsdfbrend.h
new file mode 100644
index 000000000..5805c518a
--- /dev/null
+++ b/src/sdfb/ftsdfbrend.h
@@ -0,0 +1,43 @@
+
+#ifndef FTSDFBREND_H_
+#define FTSDFBREND_H_
+
+
+#include <freetype/ftrender.h>
+#include <freetype/ftmodapi.h>
+#include <freetype/internal/ftobjs.h>
+
+
+FT_BEGIN_HEADER
+
+  /**************************************************************************
+   *
+   * @struct:
+   *   SDFB_Renderer_Module
+   *
+   * @description:
+   *   [TODO]
+   *
+   * @fields:
+   *   [TODO]
+   *
+   */
+  typedef struct  SDFB_Renderer_Module_
+  {
+    FT_RendererRec  root;
+    FT_UInt         spread;
+    FT_Bool         flip_sign;
+    FT_Bool         flip_y;
+
+  } SDFB_Renderer_Module, *SDFB_Renderer;
+
+
+  FT_DECLARE_RENDERER( ft_sdfb_renderer_class )
+
+
+FT_END_HEADER
+
+#endif /* FTSDFBREND_H_ */
+
+
+/* END */
diff --git a/src/sdfb/module.mk b/src/sdfb/module.mk
new file mode 100644
index 000000000..0bb308ca1
--- /dev/null
+++ b/src/sdfb/module.mk
@@ -0,0 +1,10 @@
+
+
+FTMODULE_H_COMMANDS += SDFB_RENDERER
+
+define SDFB_RENDERER
+$(OPEN_DRIVER) FT_Renderer_Class, ft_sdfb_renderer_class $(CLOSE_DRIVER)
+$(ECHO_DRIVER)sdfb      $(ECHO_DRIVER_DESC)signed distance field converter$(ECHO_DRIVER_DONE)
+endef
+
+#EOF
diff --git a/src/sdfb/rules.mk b/src/sdfb/rules.mk
new file mode 100644
index 000000000..b17b008ff
--- /dev/null
+++ b/src/sdfb/rules.mk
@@ -0,0 +1,60 @@
+
+
+# sdf bitmap driver directory
+#
+SDFB_DIR := $(SRC_DIR)/sdfb
+
+
+# compilation flags for the driver
+#
+SDFB_COMPILE := $(CC) $(ANSIFLAGS)                             \
+                     $I$(subst /,$(COMPILER_SEP),$(SDFB_DIR))  \
+                     $(INCLUDE_FLAGS)                          \
+                     $(FT_CFLAGS)
+
+
+# sdf bitmap driver sources (i.e., C files)
+#
+SDFB_DRV_SRC := $(SDFB_DIR)/ftsdfbrend.c  \
+               $(SDFB_DIR)/ftsdfb.c
+
+
+# sdf bitmap driver headers
+#
+SDFB_DRV_H := $(SDFB_DRV_SRC:%.c=%.h)  \
+             $(SDFB_DIR)/ftsdferrs.h
+
+
+# sdf bitmap driver object(s)
+#
+#   SDFB_DRV_OBJ_M is used during `multi' builds.
+#   SDFB_DRV_OBJ_S is used during `single' builds.
+#
+SDFB_DRV_OBJ_M := $(SDFB_DRV_SRC:$(SDFB_DIR)/%.c=$(OBJ_DIR)/%.$O)
+SDFB_DRV_OBJ_S := $(OBJ_DIR)/sdfb.$O
+
+
+# sdf driver source file for single build
+#
+SDFB_DRV_SRC_S := $(SDFB_DIR)/sdfb.c
+
+
+# sdf bitmap driver - single object
+#
+$(SDFB_DRV_OBJ_S): $(SDFB_DRV_SRC_S) $(SDFB_DRV_SRC) \
+                  $(FREETYPE_H) $(SDFB_DRV_H)
+	$(SDFB_COMPILE) $T$(subst /,$(COMPILER_SEP),$@ $(SDFB_DRV_SRC_S))
+
+
+# sdf bitmap driver - multiple objects
+#
+$(OBJ_DIR)/%.$O: $(SDFB_DIR)/%.c $(FREETYPE_H) $(SDFB_DRV_H)
+	$(SDFB_COMPILE) $T$(subst /,$(COMPILER_SEP),$@ $<)
+
+
+# update main driver list
+#
+DRV_OBJS_S += $(SDFB_DRV_OBJ_S)
+DRV_OBJS_M += $(SDFB_DRV_OBJ_M)
+
+# EOF
diff --git a/src/sdfb/sdfb.c b/src/sdfb/sdfb.c
new file mode 100644
index 000000000..67a683329
--- /dev/null
+++ b/src/sdfb/sdfb.c
@@ -0,0 +1,9 @@
+
+
+#define FT_MAKE_OPTION_SINGLE_OBJECT
+
+#include "ftsdfbrend.c"
+#include "ftsdfb.c"
+
+
+/* END */