rpicamera: convert font into C header during compilation (#1638)

README.md

@@ -578,6 +578,7 @@ The server can be compiled with native support for the Raspberry Pi Camera. Comp
 * Go ≥ 1.20
 * `libcamera-dev`
 * `libfreetype-dev`
+* `xxd`
 * `patchelf`
 
 Download the repository, open a terminal in it and run:

internal/rpicamera/exe/Makefile

@@ -36,7 +36,10 @@ OBJS = \
 
 all: exe
 
-%.o: %.c
+text_font.h: text_font.ttf
+	xxd --include $< > text_font.h
+
+%.o: %.c text_font.h
 	$(CC) $(CFLAGS) -c $< -o $@
 
 %.o: %.cpp

internal/rpicamera/exe/text.c

@@ -42,8 +42,8 @@ bool text_create(const parameters_t *params, text_t **text) {
 
         error = FT_New_Memory_Face(
             textp->library,
-            IBMPlexMono_Medium,
-            sizeof(IBMPlexMono_Medium),
+            text_font_ttf,
+            sizeof(text_font_ttf),
             0,
             &textp->face);
         if (error) {