font-edit: Unify the build system

The 'font-edit' tool previously used a simple Makefile for building, but
has now been integrated into the unified build system used across all
modules.

.gitignore

@@ -4,6 +4,8 @@
 *.a
 demo-*
 .demo-*
+font-edit
+.font-edit
 
 # Swap
 [._]*.s[a-v][a-z]
@@ -28,8 +30,5 @@ __pycache__/
 .config.old
 config.h
 
-# Tools
-tools/ttf/twin-ttf
-
 # CI pipeline
-expected-format
+expected-format

Makefile

@@ -142,6 +142,20 @@ demo-$(BACKEND)_ldflags-y := \
 	$(TARGET_LIBS)
 endif
 
+ifeq ($(CONFIG_TOOLS), y)
+target-$(CONFIG_TOOL_FONTEDIT) += font-edit
+font-edit_files-y = \
+    tools/font-edit/sfit.c \
+    tools/font-edit/font-edit.c
+font-edit_includes-y := tools/font-edit
+font-edit_cflags-y := \
+    $(shell pkg-config --cflags cairo) \
+    $(shell sdl2-config --cflags)
+font-edit_ldflags-y := \
+    $(shell pkg-config --libs cairo) \
+    $(shell sdl2-config --libs)
+endif
+
 CFLAGS += -include config.h
 
 check_goal := $(strip $(MAKECMDGOALS))

configs/Kconfig

@@ -123,4 +123,18 @@ config DEMO_IMAGE
     select LOADER_TVG
     default y
     depends on DEMO_APPLICATIONS 
+
+endmenu
+
+menu "Tools"
+
+config TOOLS
+    bool "Build tools"
+    default y
+
+config TOOL_FONTEDIT
+    bool "Build scalable font editor"
+    default y
+    depends on TOOLS
+
 endmenu

tools/font-edit/README.md

@@ -1,5 +1,5 @@
-# twin-fedit
-`twin-fedit` is a tool allowing users to edit specific scalable fonts
+# font-edit
+`font-edit` is a tool allowing users to edit specific scalable fonts
 which are expected to fit the requirements of embedded systems with larger screens.
 
 <p align="center">
@@ -13,14 +13,13 @@ sudo apt-get install libsdl2-dev libcairo2-dev
 
 ## Usage
 ```shell
-make
-./twin-fedit nchars
+./font-edit nchars
 ```
 
 ## Background
-The glyphs in `twin-fedit` is originated from [Hershey vector fonts](https://en.wikipedia.org/wiki/Hershey_fonts), which were created by Dr. A. V. Hershey while working at the U. S. National Bureau of Standards.
+The glyphs in `font-edit` is originated from [Hershey vector fonts](https://en.wikipedia.org/wiki/Hershey_fonts), which were created by Dr. A. V. Hershey while working at the U. S. National Bureau of Standards.
 
-The Hershey vector fonts set of `twin-fedit` is [`nchars`](nchars), for example, the interpolation points and operations used to draw the glyph `1` are as follows
+The Hershey vector fonts set of `font-edit` is [`nchars`](nchars), for example, the interpolation points and operations used to draw the glyph `1` are as follows
 ```
 /* 0x31 '1'  offset 666 */
     0, 10, 42, 0, 2, 3,
@@ -51,7 +50,7 @@ According to the steps outlined above for drawing glyph `1`, it can be split int
 3. `'l' 10,0`: Starting from `10,-42` and ending at `10,0`, draw a straight line.  
 4. `'e'`: End the drawing of glyph `1`.
 
-Each point seen in `twin-fedit` corresponds to an operation. By selecting a point in `twin-fedit`, you can modify the coordinates to edit any glyph.
+Each point seen in `font-edit` corresponds to an operation. By selecting a point in `font-edit`, you can modify the coordinates to edit any glyph.
 
 ## Quick Guide
 For each glyph, there are the following shortcut keys used for editing the glyph.
@@ -90,4 +89,4 @@ To delete a point
 2. Use d key to delete the selected point.
 
 To undo any operations above
-1. Use u key.
+1. Use u key.

tools/font-edit/twin-fedit.c → tools/font-edit/font-edit.c

@@ -21,13 +21,13 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include "twin-fedit.h"
-
 #include <SDL.h>
 #include <SDL_keycode.h>
 #include <cairo.h>
 #include <stdbool.h>
 
+#include "font-edit.h"
+
 static SDL_Window *window;
 static cairo_t *cr;
 static cairo_surface_t *surface;

tools/font-edit/sfit.c

@@ -20,7 +20,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include "twin-fedit.h"
+#include "font-edit.h"
 
 static double min(double a, double b)
 {