Move font to shared

shared/fonts/README.md

@@ -0,0 +1,35 @@
+Fonts
+=====
+
+In order to work with [LVGL], fonts need to be converted to bitmaps, stored as C arrays. BuffyBox currently uses a combination of the [OpenSans] font for text and the [FontAwesome] font for pictograms. For both fonts only limited character ranges are included to reduce the binary size. To (re)generate the C file containing the combined font, run the following command
+
+```
+$ ./regenerate.sh
+```
+
+Below is a short explanation of the different unicode ranges used above.
+
+- [OpenSans]
+  - Basic Latin (`0x0020-0x007F`)
+  - Latin-1 supplement (`0x00A0-0x00FF`)
+  - Latin extended A (`0x0100-0x017F`)
+  - Greek and Coptic (`0x0370-0x03FF`)
+  - General punctuation (`0x2000-0x206F`)
+  - Currency symbols (`0x20A0-0x20CF`)
+  - Mathematical operators (`0x2200-0x22FF`)
+- [FontAwesome]
+  - Standard `LV_SYMBOL_*` glyphs (`0xF001,0xF008,0xF00B,0xF00C,0xF00D,0xF011,0xF013,0xF015,0xF019,0xF01C,0xF021,0xF026,0xF027,0xF028,0xF03E,0xF0E0,0xF304,0xF043,0xF048,0xF04B,0xF04C,0xF04D,0xF051,0xF052,0xF053,0xF054,0xF067,0xF068,0xF06E,0xF070,0xF071,0xF074,0xF077,0xF078,0xF079,0xF07B,0xF093,0xF095,0xF0C4,0xF0C5,0xF0C7,0xF0C9,0xF0E7,0xF0EA,0xF0F3,0xF11C,0xF124,0xF158,0xF1EB,0xF240,0xF241,0xF242,0xF243,0xF244,0xF287,0xF293,0xF2ED,0xF55A,0xF7C2,0xF8A2`)
+  - [adjust] (`0xF042`)
+  - [arrow-alt-circle-up] (`0xF35B`)
+
+## License
+
+The [OpenSans] font is licensed under the Apache License 2.0.
+
+The [FontAwesome] font is licensed under the Open Font License version 1.1.
+
+[LVGL]: https://lvgl.io
+[FontAwesome]: https://fontawesome.com/
+[OpenSans]: https://fonts.google.com/specimen/Open+Sans
+[adjust](https://fontawesome.com/v5/icons/adjust)
+[arrow-alt-circle-up](https://fontawesome.com/v5/icons/arrow-alt-circle-up)

shared/fonts/regenerate.sh

@@ -0,0 +1,25 @@
+#!/bin/sh -ex
+
+# Copyright 2022 Johannes Marbach
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+
+npx lv_font_conv --bpp 4 --size 32 --no-compress -o font_32.c --format lvgl \
+    --font OpenSans-Regular.ttf \
+      --range '0x0020-0x007F' \
+      --range '0x00A0-0x00FF' \
+      --range '0x0100-0x017F' \
+      --range '0x0370-0x03FF' \
+      --range '0x2000-0x206F' \
+      --range '0x20A0-0x20CF' \
+      --range '0x2200-0x22FF' \
+    --font FontAwesome5-Solid+Brands+Regular.woff \
+      --range '0xF001,0xF008,0xF00B,0xF00C,0xF00D,0xF011,0xF013,0xF015,0xF019,0xF01C,0xF021,0xF026,0xF027,0xF028,0xF03E,0xF0E0,0xF304,0xF043,0xF048,0xF04B,0xF04C,0xF04D,0xF051,0xF052,0xF053,0xF054,0xF067,0xF068,0xF06E,0xF070,0xF071,0xF074,0xF077,0xF078,0xF079,0xF07B,0xF093,0xF095,0xF0C4,0xF0C5,0xF0C7,0xF0C9,0xF0E7,0xF0EA,0xF0F3,0xF11C,0xF124,0xF158,0xF1EB,0xF240,0xF241,0xF242,0xF243,0xF244,0xF287,0xF293,0xF2ED,0xF55A,0xF7C2,0xF8A2' \
+      --range '0xF042' \
+      --range '0xF35B'
+
+# Fix type qualifier for compatibility with LV_FONT_DECLARE and add prefix
+sed 's/^lv_font_t /const lv_font_t /g' font_32.c \
+    | sed 's/lv_font_t font_32/lv_font_t bb_font_32/g' \
+    > font_32.c.tmp
+mv font_32.c.tmp font_32.c

shared/theme.c

@@ -86,7 +86,7 @@ static void keyboard_draw_task_added_cb(lv_event_t *event);
 
 static void init_styles(const bb_theme *theme) {
     reset_style(&(styles.widget));
-    lv_style_set_text_font(&(styles.widget), &font_32);
+    lv_style_set_text_font(&(styles.widget), &bb_font_32);
 
     reset_style(&(styles.window));
     lv_style_set_bg_opa(&(styles.window), LV_OPA_COVER);
@@ -376,9 +376,9 @@ void bb_theme_apply(const bb_theme *theme) {
     }
 
     lv_theme.disp = NULL;
-    lv_theme.font_small = &font_32;
-    lv_theme.font_normal = &font_32;
-    lv_theme.font_large = &font_32;
+    lv_theme.font_small = &bb_font_32;
+    lv_theme.font_normal = &bb_font_32;
+    lv_theme.font_large = &bb_font_32;
     lv_theme.apply_cb = apply_theme_cb;
 
     current_theme = *theme;