From b366200d4b80dc52f795244351f2bd362bdabc32 Mon Sep 17 00:00:00 2001
From: Pk11 <epicpkmn11@outlook.com>
Date: Sun, 1 Aug 2021 23:24:16 -0500
Subject: [PATCH] Switch to a RIFF font format
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Fix height of ラ character

I accidentally made it 1px too tall before

Add Cyrillic to default font

Make Я more like latin R

Right after I commit, looking at my screenshot I notice I forgot to tweak the Я to be more angled like this font's latin R...

Improve the default font's Kana

derp fix

Properly handle invalid UTF-8

Fix conversion PBMs with non-byte aligned rows

Rename font extension to .frf

For Font RiFf

Re-add PBM font support

Default converting to CP-437 and try guess size

Revert "Default converting to CP-437 and try guess size"

Reverts 2c9a47d224b28cbb51a3ee335fd9970265201b72 as I think the old behaviour works better given PBM font support being kept

Re-add mapping file for CP-437

Automatically use mapping file with same name as image

ex. for "font_6x10.pbm" it will use "font_6x10.txt" in the same directory
---
 README.md                      |   4 +-
 arm9/source/common/ui.c        | 348 +++++++++++++++++++++++++++------
 arm9/source/common/ui.h        |   5 +-
 arm9/source/filesys/filetype.c |   2 +
 arm9/source/filesys/filetype.h |   9 +-
 arm9/source/godmode.c          |  34 ++--
 arm9/source/system/vram0.h     |   6 +-
 data/font_default.frf          | Bin 0 -> 6756 bytes
 data/font_default.pbm          | Bin 2006 -> 0 bytes
 resources/fonts/cp_437.txt     |  16 ++
 resources/fonts/font_6x10.pbm  | Bin 2006 -> 4256 bytes
 resources/fonts/font_6x10.txt  |  35 ++++
 utils/fontriff.py              | 118 +++++++++++
 13 files changed, 489 insertions(+), 88 deletions(-)
 create mode 100644 data/font_default.frf
 delete mode 100644 data/font_default.pbm
 create mode 100644 resources/fonts/cp_437.txt
 create mode 100644 resources/fonts/font_6x10.txt
 create mode 100755 utils/fontriff.py

diff --git a/README.md b/README.md
index bdcfba2..a54835d 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,7 @@ GodMode9 is designed to be intuitive, buttons leading to the results you'd expec
 ## How to build this / developer info
 Build `GodMode9.firm` via `make firm`. This requires [firmtool](https://github.com/TuxSH/firmtool), [Python 3.5+](https://www.python.org/downloads/) and [devkitARM](https://sourceforge.net/projects/devkitpro/) installed).
 
-You may run `make release` to get a nice, release-ready package of all required files. To build __SafeMode9__ (a bricksafe variant of GodMode9, with limited write permissions) instead of GodMode9, compile with `make FLAVOR=SafeMode9`. To switch screens, compile with `make SWITCH_SCREENS=1`. For additional customization, you may choose the internal font by replacing `font_default.pbm` inside the `data` directory. You may also hardcode the brightness via `make FIXED_BRIGHTNESS=x`, whereas `x` is a value between 0...15.
+You may run `make release` to get a nice, release-ready package of all required files. To build __SafeMode9__ (a bricksafe variant of GodMode9, with limited write permissions) instead of GodMode9, compile with `make FLAVOR=SafeMode9`. To switch screens, compile with `make SWITCH_SCREENS=1`. For additional customization, you may choose the internal font by replacing `font_default.frf` inside the `data` directory. You may also hardcode the brightness via `make FIXED_BRIGHTNESS=x`, whereas `x` is a value between 0...15.
 
 Further customization is possible by hardcoding `aeskeydb.bin` (just put the file into the `data` folder when compiling). All files put into the `data` folder will turn up in the `V:` drive, but keep in mind there's a hard 3MB limit for all files inside, including overhead. A standalone script runner is compiled by providing `autorun.gm9` (again, in the `data` folder) and building with `make SCRIPT_RUNNER=1`. There's more possibility for customization, read the Makefiles to learn more.
 
@@ -88,7 +88,7 @@ GodMode9 provides access to system data via drives, a listing of what each drive
 * __`K: AESKEYDB IMAGE`__: An `aeskeydb.bin` image can be mounted and accessed via this drive. The drive shows all keys inside the aeskeydb.bin. This is read-only.
 * __`T: TICKET.DB IMAGE / BDRI IMAGE`__: Ticket database files can be mounted and accessed via this drive. This provides easy and quick access to all tickets inside the `ticket.db`. This drive also provides access to other BDRI images, such as the Title database (`title.db`).
 * __`M: MEMORY VIRTUAL`__: This provides access to various memory regions. This is protected by a special write permission, and caution is advised when doing modifications inside this drive. This drive also gives access to `boot9.bin`, `boot11.bin` (boot9strap only) and `otp.mem` (sighaxed systems only).
-* __`V: VRAM VIRTUAL`__: This drive resides in the first VRAM bank and contains files essential to GodMode9. The font (in PBM format), the splash logo (in PNG format) and the readme file are found there, as well as any file that is provided inside the `data` folder at build time. This is read-only.
+* __`V: VRAM VIRTUAL`__: This drive resides in the first VRAM bank and contains files essential to GodMode9. The font (in FRF format), the splash logo (in PNG format) and the readme file are found there, as well as any file that is provided inside the `data` folder at build time. This is read-only.
 * __`Y: TITLE MANAGER`__: The title manager is accessed via the HOME menu and provides easy access to all installed titles.
 * __`Z: LAST SEARCH`__: After a search operation, search results are found inside this drive. The drive can be accessed at a later point to return to the former search results.
 
diff --git a/arm9/source/common/ui.c b/arm9/source/common/ui.c
index 57c6fd4..33b5a1d 100644
--- a/arm9/source/common/ui.c
+++ b/arm9/source/common/ui.c
@@ -23,11 +23,103 @@
 
 static u32 font_width = 0;
 static u32 font_height = 0;
+static u32 font_count = 0;
 static u32 line_height = 0;
-static u8 font_bin[FONT_MAX_HEIGHT * 256];
+static u16 question_mark_index = 0;
+static u8* font_bin = NULL;
+static u16* font_map = NULL;
+
+// lookup table to sort CP-437 so it can be binary searched with Unicode codepoints
+static const u8 cp437_sorted[0x100] = {
+    0x00, 0xF5, 0xF6, 0xFC, 0xFD, 0xFB, 0xFA, 0xA4, 0xF3, 0xF2, 0xF4, 0xF9, 0xF8, 0xFE, 0xFF, 0xF7,
+    0xEF, 0xF1, 0xAD, 0xA5, 0x6D, 0x65, 0xED, 0xAE, 0xA9, 0xAB, 0xAA, 0xA8, 0xB2, 0xAC, 0xEE, 0xF0,
+    0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10,
+    0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20,
+    0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,
+    0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x40,
+    0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
+    0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F, 0xB8,
+    0x77, 0x95, 0x85, 0x7F, 0x80, 0x7D, 0x81, 0x83, 0x86, 0x87, 0x84, 0x8B, 0x8A, 0x88, 0x74, 0x75,
+    0x78, 0x82, 0x76, 0x8F, 0x90, 0x8D, 0x94, 0x92, 0x96, 0x7A, 0x7B, 0x62, 0x63, 0x64, 0xA7, 0x97,
+    0x7E, 0x89, 0x8E, 0x93, 0x8C, 0x79, 0x66, 0x6F, 0x73, 0xB9, 0x68, 0x72, 0x71, 0x61, 0x67, 0x70,
+    0xE9, 0xEA, 0xEB, 0xBD, 0xC3, 0xD8, 0xD9, 0xCD, 0xCC, 0xDA, 0xC8, 0xCE, 0xD4, 0xD3, 0xD2, 0xBF,
+    0xC0, 0xC5, 0xC4, 0xC2, 0xBC, 0xC6, 0xD5, 0xD6, 0xD1, 0xCB, 0xE0, 0xDD, 0xD7, 0xC7, 0xE3, 0xDE,
+    0xDF, 0xDB, 0xDC, 0xD0, 0xCF, 0xC9, 0xCA, 0xE2, 0xE1, 0xC1, 0xBE, 0xE6, 0xE5, 0xE7, 0xE8, 0xE4,
+    0x9D, 0x7C, 0x98, 0xA0, 0x9A, 0xA1, 0x6C, 0xA2, 0x9B, 0x99, 0x9C, 0x9E, 0xB1, 0xA3, 0x9F, 0xB3,
+    0xB5, 0x6A, 0xB7, 0xB6, 0xBA, 0xBB, 0x91, 0xB4, 0x69, 0xAF, 0x6E, 0xB0, 0xA6, 0x6B, 0xEC, 0x60
+};
+
+// Unicode font mapping for sorted CP-437
+static const u16 cp437_sorted_map[0x100] = {
+    0x0000, 0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027, 0x0028, 0x0029, 0x002A, 0x002B, 0x002C, 0x002D, 0x002E,
+    0x002F, 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037, 0x0038, 0x0039, 0x003A, 0x003B, 0x003C, 0x003D, 0x003E,
+    0x003F, 0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047, 0x0048, 0x0049, 0x004A, 0x004B, 0x004C, 0x004D, 0x004E,
+    0x004F, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057, 0x0058, 0x0059, 0x005A, 0x005B, 0x005C, 0x005D, 0x005E,
+    0x005F, 0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067, 0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E,
+    0x006F, 0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077, 0x0078, 0x0079, 0x007A, 0x007B, 0x007C, 0x007D, 0x007E,
+    0x00A0, 0x00A1, 0x00A2, 0x00A3, 0x00A5, 0x00A7, 0x00AA, 0x00AB, 0x00AC, 0x00B0, 0x00B1, 0x00B2, 0x00B5, 0x00B6, 0x00B7, 0x00BA,
+    0x00BB, 0x00BC, 0x00BD, 0x00BF, 0x00C4, 0x00C5, 0x00C6, 0x00C7, 0x00C9, 0x00D1, 0x00D6, 0x00DC, 0x00DF, 0x00E0, 0x00E1, 0x00E2,
+    0x00E4, 0x00E5, 0x00E6, 0x00E7, 0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF, 0x00F1, 0x00F2, 0x00F3, 0x00F4,
+    0x00F6, 0x00F7, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x00FF, 0x0192, 0x0393, 0x0398, 0x03A3, 0x03A6, 0x03A9, 0x03B1, 0x03B4, 0x03B5,
+    0x03C0, 0x03C3, 0x03C4, 0x03C6, 0x2022, 0x203C, 0x207F, 0x20A7, 0x2190, 0x2191, 0x2192, 0x2193, 0x2194, 0x2195, 0x21A8, 0x2219,
+    0x221A, 0x221E, 0x221F, 0x2229, 0x2248, 0x2261, 0x2264, 0x2265, 0x2302, 0x2310, 0x2320, 0x2321, 0x2500, 0x2502, 0x250C, 0x2510,
+    0x2514, 0x2518, 0x251C, 0x2524, 0x252C, 0x2534, 0x253C, 0x2550, 0x2551, 0x2552, 0x2553, 0x2554, 0x2555, 0x2556, 0x2557, 0x2558,
+    0x2559, 0x255A, 0x255B, 0x255C, 0x255D, 0x255E, 0x255F, 0x2560, 0x2561, 0x2562, 0x2563, 0x2564, 0x2565, 0x2566, 0x2567, 0x2568,
+    0x2569, 0x256A, 0x256B, 0x256C, 0x2580, 0x2584, 0x2588, 0x258C, 0x2590, 0x2591, 0x2592, 0x2593, 0x25A0, 0x25AC, 0x25B2, 0x25BA,
+    0x25BC, 0x25C4, 0x25CB, 0x25D8, 0x25D9, 0x263A, 0x263B, 0x263C, 0x2640, 0x2642, 0x2660, 0x2663, 0x2665, 0x2666, 0x266A, 0x266B
+};
 
 #define PIXEL_OFFSET(x, y)  (((x) * SCREEN_HEIGHT) + (SCREEN_HEIGHT - (y) - 1))
 
+
+u16 GetFontIndex(u16 c)
+{
+    int left = 0;
+    int right = font_count;
+
+    while (left <= right) {
+        int mid = left + ((right - left) / 2);
+        if (font_map[mid] == c)
+            return mid;
+
+        if (font_map[mid] < c)
+            left = mid + 1;
+        else
+            right = mid - 1;
+    }
+
+    // if not found in font, return a '?'
+    return question_mark_index;
+}
+
+// gets a u32 codepoint from a UTF-8 string and moves the pointer to the next character
+u32 GetCharacter(const char** str)
+{
+    u32 c;
+
+    if ((**str & 0x80) == 0) {
+        c = *(*str)++;
+    } else if ((**str & 0xE0) == 0xC0) {
+        c  = (*(*str)++ & 0x1F) << 6;
+        c |=  *(*str)++ & 0x3F;
+    } else if ((**str & 0xF0) == 0xE0) {
+        c  = (*(*str)++ & 0x0F) << 12;
+        c |= (*(*str)++ & 0x3F) << 6;
+        c |=  *(*str)++ & 0x3F;
+    } else if ((**str & 0xF8) == 0xF0) {
+        c  = (*(*str)++ & 0x07) << 18;
+        c |= (*(*str)++ & 0x3F) << 12;
+        c |= (*(*str)++ & 0x3F) << 6;
+        c |=  *(*str)++ & 0x3F;
+    } else {
+        // invalid UTF-8, skip to next character
+        (*str)++;
+        c = '?';
+    }
+
+    return c;
+}
+
 u8* GetFontFromPbm(const void* pbm, const u32 pbm_size, u32* w, u32* h) {
     char* hdr = (char*) pbm;
     u32 hdr_max_size = min(512, pbm_size);
@@ -90,46 +182,130 @@ u8* GetFontFromPbm(const void* pbm, const u32 pbm_size, u32* w, u32* h) {
     return (u8*) pbm + p;
 }
 
-// sets the font from a given PBM
-// if no PBM is given, the PBM is fetched from the default VRAM0 location
-bool SetFontFromPbm(const void* pbm, u32 pbm_size) {
+u8* GetFontFromRiff(const void* riff, const u32 riff_size, u32* w, u32* h, u16* count) {
+    u8 *ptr = (u8*) riff;
+    u8 riff_w = 0;
+    u8 riff_h = 0;
+    u16 riff_count = 0;
+
+    // check header magic, then skip over
+    if (memcmp(ptr, "RIFF", 4) != 0) return NULL;
+
+    // ensure enough space is allocated
+    u32 data_size;
+    memcpy(&data_size, ptr + 4, sizeof(u32));
+    if (data_size > riff_size) return NULL;
+
+    ptr += 8;
+
+    // check for and load META section
+    if (memcmp(ptr, "META", 4) == 0) {
+        riff_w = ptr[8];
+        riff_h = ptr[9];
+        memcpy(&riff_count, ptr + 10, sizeof(u16));
+
+        u32 section_size;
+        memcpy(&section_size, ptr + 4, sizeof(u32));
+        ptr += 8 + section_size;
+
+        if (riff_w > FONT_MAX_WIDTH || riff_h > FONT_MAX_HEIGHT) return NULL;
+    } else return NULL;
+
+    // all good
+    if (w) *w = riff_w;
+    if (h) *h = riff_h;
+    if (count) *count = riff_count;
+    return ptr;
+}
+
+// sets the font from a given RIFF or PBM
+// if no font is given, the font is fetched from the default VRAM0 location
+bool SetFont(const void* font, u32 font_size) {
     u32 w, h;
+    u16 count;
     u8* ptr = NULL;
 
-    if (!pbm) {
-        u64 pbm_size64 = 0;
-        pbm = FindVTarFileInfo(VRAM0_FONT_PBM, &pbm_size64);
-        pbm_size = (u32) pbm_size64;
+    if (!font) {
+        u64 font_size64 = 0;
+        font = FindVTarFileInfo(VRAM0_FONT, &font_size64);
+        font_size = (u32) font_size64;
     }
 
-    if (pbm)
-        ptr = GetFontFromPbm(pbm, pbm_size, &w, &h);
-
-    if (!ptr) {
+    if (!font)
         return false;
-    } else if (w > 8) {
-        font_width = w / 16;
-        font_height = h / 16;
-        memset(font_bin, 0x00, w * h / 8);
 
-        for (u32 cy = 0; cy < 16; cy++) {
-            for (u32 row = 0; row < font_height; row++) {
-                for (u32 cx = 0; cx < 16; cx++) {
-                    u32 bp0 = (cx * font_width) >> 3;
-                    u32 bm0 = (cx * font_width) % 8;
-                    u8 byte = ((ptr[bp0] << bm0) | (ptr[bp0+1] >> (8 - bm0))) & (0xFF << (8 - font_width));
-                    font_bin[(((cy << 4) + cx) * font_height) + row] = byte;
-                }
-                ptr += font_width << 1;
-            }
-        }
-    } else {
+    if ((ptr = GetFontFromRiff(font, font_size, &w, &h, &count))) { // RIFF font
         font_width = w;
-        font_height = h / 256;
-        memcpy(font_bin, ptr, h);
+        font_height = h;
+        font_count = count;
+
+        // character data
+        if (memcmp(ptr, "CDAT", 4) == 0) {
+            u32 section_size;
+            memcpy(&section_size, ptr + 4, sizeof(u32));
+
+            if (font_bin) free(font_bin);
+            font_bin = malloc(font_height * font_count);
+            if (!font_bin) return NULL;
+
+            memcpy(font_bin, ptr + 8, font_height * font_count);
+
+            ptr += 8 + section_size;
+        } else return NULL;
+
+        // character map
+        if (memcmp(ptr, "CMAP", 4) == 0) {
+            u32 section_size;
+            memcpy(&section_size, ptr + 4, sizeof(u32));
+
+            if (font_map) free(font_map);
+            font_map = malloc(sizeof(u16) * font_count);
+            if (!font_map) return NULL;
+
+            memcpy(font_map, ptr + 8, sizeof(u16) * font_count);
+
+            ptr += 8 + section_size;
+        } else return NULL;
+    } else if ((ptr = GetFontFromPbm(font, font_size, &w, &h))) {
+        font_count = 0x100;
+
+        if (w > 8) {
+            font_width = w / 16;
+            font_height = h / 16;
+
+            if (font_bin) free(font_bin);
+            font_bin = malloc(font_height * font_count);
+            if (!font_bin) return NULL;
+
+            for (u32 cy = 0; cy < 16; cy++) {
+                for (u32 row = 0; row < font_height; row++) {
+                    for (u32 cx = 0; cx < 16; cx++) {
+                        u32 bp0 = (cx * font_width) >> 3;
+                        u32 bm0 = (cx * font_width) % 8;
+                        u8 byte = ((ptr[bp0] << bm0) | (ptr[bp0+1] >> (8 - bm0))) & (0xFF << (8 - font_width));
+                        font_bin[(cp437_sorted[(cy << 4) + cx] * font_height) + row] = byte;
+                    }
+                    ptr += font_width << 1;
+                }
+            }
+        } else {
+            font_width = w;
+            font_height = h / 256;
+            for (u32 i = 0; i < font_count; i++)
+                memcpy(font_bin + cp437_sorted[i] * font_height, ptr + i * font_height, font_height);
+        }
+
+        if (font_map) free(font_map);
+        font_map = malloc(sizeof(u16) * font_count);
+        if (!font_map) return NULL;
+
+        memcpy(font_map, cp437_sorted_map, sizeof(cp437_sorted_map));
+    } else {
+        return false;
     }
 
     line_height = min(10, font_height + 2);
+    question_mark_index = GetFontIndex('?');
     return true;
 }
 
@@ -222,14 +398,14 @@ void DrawQrCode(u16 *screen, const u8* qrcode)
     }
 }
 
-void DrawCharacter(u16 *screen, int character, int x, int y, u32 color, u32 bgcolor)
+void DrawCharacter(u16 *screen, u32 character, int x, int y, u32 color, u32 bgcolor)
 {
     for (int yy = 0; yy < (int) font_height; yy++) {
         int xDisplacement = x * SCREEN_HEIGHT;
         int yDisplacement = SCREEN_HEIGHT - (y + yy) - 1;
         u16* screenPos = screen + xDisplacement + yDisplacement;
 
-        u8 charPos = font_bin[character * font_height + yy];
+        u8 charPos = font_bin[GetFontIndex(character) * font_height + yy];
         for (int xx = 7; xx >= (8 - (int) font_width); xx--) {
             if ((charPos >> xx) & 1) {
                 *screenPos = color;
@@ -241,14 +417,12 @@ void DrawCharacter(u16 *screen, int character, int x, int y, u32 color, u32 bgco
     }
 }
 
-void DrawString(u16 *screen, const char *str, int x, int y, u32 color, u32 bgcolor, bool fix_utf8)
+void DrawString(u16 *screen, const char *str, int x, int y, u32 color, u32 bgcolor)
 {
     size_t max_len = (((screen == TOP_SCREEN) ? SCREEN_WIDTH_TOP : SCREEN_WIDTH_BOT) - x) / font_width;
-    size_t len = (strlen(str) > max_len) ? max_len : strlen(str);
 
-    for (size_t i = 0; i < len; i++) {
-        char c = (char) (fix_utf8 && str[i] >= 0x80) ? '?' : str[i];
-        DrawCharacter(screen, c, x + i * font_width, y, color, bgcolor);
+    for (size_t i = 0; i < max_len && *str; i++) {
+        DrawCharacter(screen, GetCharacter(&str), x + i * font_width, y, color, bgcolor);
     }
 }
 
@@ -261,7 +435,7 @@ void DrawStringF(u16 *screen, int x, int y, u32 color, u32 bgcolor, const char *
     va_end(va);
 
     for (char* text = strtok(str, "\n"); text != NULL; text = strtok(NULL, "\n"), y += line_height)
-        DrawString(screen, text, x, y, color, bgcolor, true);
+        DrawString(screen, text, x, y, color, bgcolor);
 }
 
 void DrawStringCenter(u16 *screen, u32 color, u32 bgcolor, const char *format, ...)
@@ -292,11 +466,21 @@ u32 GetDrawStringWidth(const char* str) {
     char* old_lf = (char*) str;
     char* str_end = (char*) str + strnlen(str, STRBUF_SIZE);
     for (char* lf = strchr(str, '\n'); lf != NULL; lf = strchr(lf + 1, '\n')) {
-        if ((u32) (lf - old_lf) > width) width = lf - old_lf;
+        u32 length = 0;
+        for (char* c = old_lf; c != lf; c++) {
+            if ((*c & 0xC0) != 0x80) length++;
+        }
+
+        if (length > width) width = length;
         old_lf = lf;
     }
-    if ((u32) (str_end - old_lf) > width)
-        width = str_end - old_lf;
+
+    u32 length = 0;
+    for (char* c = old_lf; c != str_end; c++) {
+        if ((*c & 0xC0) != 0x80) length++;
+    }
+
+    if (length > width) width = length;
     width *= font_width;
     return width;
 }
@@ -350,26 +534,60 @@ void WordWrapString(char* str, int llen) {
     }
 }
 
-void ResizeString(char* dest, const char* orig, int nsize, int tpos, bool align_right) {
-    int osize = strnlen(orig, 256);
-    if (nsize < osize) {
-        TruncateString(dest, orig, nsize, tpos);
+// dest must be at least 4x the size of nlength to account for UTF-8
+void ResizeString(char* dest, const char* orig, int nlength, int tpos, bool align_right) {
+    int olength = 0;
+    for (int i = 0; i < 256 && orig[i]; i++) {
+        if ((orig[i] & 0xC0) != 0x80) olength++;
+    }
+
+    if (nlength < olength) {
+        TruncateString(dest, orig, nlength, tpos);
     } else if (!align_right) {
+        int nsize = 0;
+        for (int i = 0; i < nlength || (orig[nsize] & 0xC0) == 0x80; nsize++) {
+            if ((orig[nsize] & 0xC0) != 0x80) i++;
+        }
         snprintf(dest, nsize + 1, "%-*.*s", nsize, nsize, orig);
     } else {
+        int nsize = 0;
+        for (int i = 0; i < nlength || (orig[nsize] & 0xC0) == 0x80; nsize++) {
+            if ((orig[nsize] & 0xC0) != 0x80) i++;
+        }
         snprintf(dest, nsize + 1, "%*.*s", nsize, nsize, orig);
     }
 }
 
-void TruncateString(char* dest, const char* orig, int nsize, int tpos) {
-    int osize = strnlen(orig, 256);
-    if (nsize < 0) {
+// dest must be at least 4x the size of nlength to account for UTF-8
+void TruncateString(char* dest, const char* orig, int nlength, int tpos) {
+    int osize = strnlen(orig, 256), olength = 0;
+    for (int i = 0; i < 256 && orig[i]; i++) {
+        if ((orig[i] & 0xC0) != 0x80) olength++;
+    }
+
+    if (nlength < 0) {
         return;
-    } else if ((nsize <= 3) || (nsize >= osize)) {
-        snprintf(dest, nsize + 1, "%s", orig);
+    } else if ((nlength <= 3) || (nlength >= olength)) {
+        strcpy(dest, orig);
     } else {
-        if (tpos + 3 > nsize) tpos = nsize - 3;
-        snprintf(dest, nsize + 1, "%-.*s...%-.*s", tpos, orig, nsize - (3 + tpos), orig + osize - (nsize - (3 + tpos)));
+        int nsize = 0;
+        for (int i = 0; i < nlength || (orig[nsize] & 0xC0) == 0x80; nsize++) {
+            if ((orig[nsize] & 0xC0) != 0x80) i++;
+        }
+
+        if (tpos + 3 > nlength) tpos = nlength - 3;
+
+        int tposStart = 0;
+        for (int i = 0; i < tpos || (orig[tposStart] & 0xC0) == 0x80; tposStart++) {
+            if ((orig[tposStart] & 0xC0) != 0x80) i++;
+        }
+
+        int tposEnd = 0;
+        for (int i = 0; i < nlength - tpos - 3; tposEnd++) {
+            if ((orig[osize - 1 - tposEnd] & 0xC0) != 0x80) i++;
+        }
+
+        snprintf(dest, nsize + 1, "%-.*s...%-.*s", tposStart, orig, tposEnd, orig + osize - tposEnd);
     }
 }
 
@@ -532,10 +750,10 @@ bool ShowUnlockSequence(u32 seqlvl, const char *format, ...) {
     DrawStringF(MAIN_SCREEN, x, y + str_height - 28, color_font, color_bg, "To proceed, enter this:");
 
     // generate sequence
-    const char dpad_symbols[] = { '\x1A', '\x1B', '\x18', '\x19' }; // R L U D
+    const char *dpad_symbols[] = { "→", "←", "↑", "↓" }; // R L U D
 
     u32 sequence[seqlen_max];
-    char seqsymbols[seqlen_max];
+    const char *seqsymbols[seqlen_max];
     u32 lastlsh = (u32) -1;
     for (u32 n = 0; n < (seqlen-1); n++) {
         u32 lsh = lastlsh;
@@ -545,13 +763,13 @@ bool ShowUnlockSequence(u32 seqlvl, const char *format, ...) {
         seqsymbols[n] = dpad_symbols[lsh];
     }
     sequence[seqlen-1] = BUTTON_A;
-    seqsymbols[seqlen-1] = 'A';
+    seqsymbols[seqlen-1] = "A";
 
 
     while (true) {
         for (u32 n = 0; n < seqlen; n++) {
             DrawStringF(MAIN_SCREEN, x + (n*4*FONT_WIDTH_EXT), y + str_height - 28 + line_height,
-                (lvl > n) ? color_on : color_off, color_bg, "<%c>", seqsymbols[n]);
+                (lvl > n) ? color_on : color_off, color_bg, "<%s>", seqsymbols[n]);
         }
         if (lvl == seqlen)
             break;
@@ -669,7 +887,7 @@ u32 ShowFileScrollPrompt(u32 n, const DirEntry** options, bool hide_ext, const c
             char bytestr[16];
             FormatBytes(bytestr, options[i]->size);
 
-            char content_str[64 + 1];
+            char content_str[64 * 4 + 1];
             char temp_str[256];
             strncpy(temp_str, options[i]->name, 256);
 
@@ -792,7 +1010,7 @@ bool ShowInputPrompt(char* inputstr, u32 max_size, u32 resize, const char* alpha
     ClearScreenF(true, false, COLOR_STD_BG);
     DrawStringF(MAIN_SCREEN, x, y, COLOR_STD_FONT, COLOR_STD_BG, "%s", str);
     DrawStringF(MAIN_SCREEN, x + 8, y + str_height - 40, COLOR_STD_FONT, COLOR_STD_BG,
-        "R - (\x18\x19) fast scroll\nL - clear data%s", resize ? "\nX - remove char\nY - insert char" : "");
+        "R - (↑↓) fast scroll\nL - clear data%s", resize ? "\nX - remove char\nY - insert char" : "");
 
     // wait for all keys released
     while (HID_ReadState() & BUTTON_ANY);
@@ -1068,8 +1286,8 @@ bool ShowProgress(u64 current, u64 total, const char* opstr)
     const u32 text_pos_y = bar_pos_y + bar_height + 2;
     u32 prog_width = ((total > 0) && (current <= total)) ? (current * (bar_width-4)) / total : 0;
     u32 prog_percent = ((total > 0) && (current <= total)) ? (current * 100) / total : 0;
-    char tempstr[64];
-    char progstr[64];
+    char tempstr[256];
+    char progstr[256];
 
     static u64 last_msec_elapsed = 0;
     static u64 last_sec_remain = 0;
@@ -1095,14 +1313,14 @@ bool ShowProgress(u64 current, u64 total, const char* opstr)
     TruncateString(progstr, opstr, min(63, (bar_width / FONT_WIDTH_EXT) - 7), 8);
     snprintf(tempstr, 64, "%s (%lu%%)", progstr, prog_percent);
     ResizeString(progstr, tempstr, bar_width / FONT_WIDTH_EXT, 8, false);
-    DrawString(MAIN_SCREEN, progstr, bar_pos_x, text_pos_y, COLOR_STD_FONT, COLOR_STD_BG, true);
+    DrawString(MAIN_SCREEN, progstr, bar_pos_x, text_pos_y, COLOR_STD_FONT, COLOR_STD_BG);
     if (sec_elapsed >= 1) {
         snprintf(tempstr, 16, "ETA %02llum%02llus", sec_remain / 60, sec_remain % 60);
         ResizeString(progstr, tempstr, 16, 8, true);
         DrawString(MAIN_SCREEN, progstr, bar_pos_x + bar_width - 1 - (FONT_WIDTH_EXT * 16),
-            bar_pos_y - line_height - 1, COLOR_STD_FONT, COLOR_STD_BG, true);
+            bar_pos_y - line_height - 1, COLOR_STD_FONT, COLOR_STD_BG);
     }
-    DrawString(MAIN_SCREEN, "(hold B to cancel)", bar_pos_x + 2, text_pos_y + 14, COLOR_STD_FONT, COLOR_STD_BG, false);
+    DrawString(MAIN_SCREEN, "(hold B to cancel)", bar_pos_x + 2, text_pos_y + 14, COLOR_STD_FONT, COLOR_STD_BG);
 
     last_prog_width = prog_width;
 
@@ -1116,8 +1334,8 @@ int ShowBrightnessConfig(int set_brightness)
     int bar_x_pos, bar_y_pos, bar_width, bar_height;
 
     const char *brightness_str =
-        "[\x1B] Decrease brightness\n"
-        "[\x1A] Increase brightness\n"
+        "[←] Decrease brightness\n"
+        "[→] Increase brightness\n"
         " \n"
         "[X] Use volume slider control\n"
         "[A] Set current brightness\n"
diff --git a/arm9/source/common/ui.h b/arm9/source/common/ui.h
index be61beb..00c625c 100644
--- a/arm9/source/common/ui.h
+++ b/arm9/source/common/ui.h
@@ -45,8 +45,9 @@ bool ShowUnlockSequence(u32 seqlvl, const char *format, ...);
 #define ShowUnlockSequence ShowPrompt
 #endif
 
-u8* GetFontFromPbm(const void* pbm, const u32 pbm_size, u32* w, u32* h);
-bool SetFontFromPbm(const void* pbm, const u32 pbm_size);
+u8* GetFontFromPbm(const void* pbm, const u32 riff_size, u32* w, u32* h);
+u8* GetFontFromRiff(const void* riff, const u32 riff_size, u32* w, u32* h, u16* count);
+bool SetFont(const void* font, const u32 font_size);
 
 u16 GetColor(const u16 *screen, int x, int y);
 
diff --git a/arm9/source/filesys/filetype.c b/arm9/source/filesys/filetype.c
index aa4f483..19a81e2 100644
--- a/arm9/source/filesys/filetype.c
+++ b/arm9/source/filesys/filetype.c
@@ -127,6 +127,8 @@ u64 IdentifyFileType(const char* path) {
         }
     } else if (GetFontFromPbm(data, fsize, NULL, NULL)) {
         return FONT_PBM;
+    } else if (GetFontFromRiff(data, fsize, NULL, NULL, NULL)) {
+        return FONT_RIFF;
     } else if ((fsize > sizeof(AgbHeader)) &&
         (ValidateAgbHeader((AgbHeader*) data) == 0)) {
         return GAME_GBA;
diff --git a/arm9/source/filesys/filetype.h b/arm9/source/filesys/filetype.h
index 31b53a6..d60e330 100644
--- a/arm9/source/filesys/filetype.h
+++ b/arm9/source/filesys/filetype.h
@@ -35,8 +35,9 @@
 #define TXT_GENERIC (1ULL<<30)
 #define GFX_PNG     (1ULL<<31)
 #define FONT_PBM    (1ULL<<32)
-#define NOIMG_NAND  (1ULL<<33)
-#define HDR_NAND    (1ULL<<34)
+#define FONT_RIFF   (1ULL<<33)
+#define NOIMG_NAND  (1ULL<<34)
+#define HDR_NAND    (1ULL<<35)
 #define TYPE_BASE   0xFFFFFFFFFFULL // 40 bit reserved for base types
 
 // #define FLAG_FIRM   (1ULL<<58) // <--- for CXIs containing FIRMs
@@ -73,9 +74,9 @@
 #define FTYPE_KEYINIT(tp)       (tp&(BIN_KEYDB))
 #define FTYPE_KEYINSTALL(tp)    (tp&(BIN_KEYDB))
 #define FTYPE_SCRIPT(tp)        (tp&(TXT_SCRIPT))
-#define FTYPE_FONT(tp)          (tp&(FONT_PBM))
+#define FTYPE_FONT(tp)          (tp&(FONT_PBM|FONT_RIFF))
 #define FTYPE_GFX(tp)           (tp&(GFX_PNG))
-#define FTYPE_SETABLE(tp)       (tp&(FONT_PBM))
+#define FTYPE_SETABLE(tp)       (tp&(FONT_PBM|FONT_RIFF))
 #define FTYPE_BOOTABLE(tp)      (tp&(SYS_FIRM))
 #define FTYPE_INSTALLABLE(tp)   (tp&(SYS_FIRM))
 #define FTYPE_AGBSAVE(tp)       (tp&(SYS_AGBSAVE))
diff --git a/arm9/source/godmode.c b/arm9/source/godmode.c
index de652c2..994b846 100644
--- a/arm9/source/godmode.c
+++ b/arm9/source/godmode.c
@@ -1216,7 +1216,7 @@ u32 FileHandlerMenu(char* current_path, u32* cursor, u32* scroll, PaneData** pan
         (filetype & BIN_LEGKEY) ? "Build " KEYDB_NAME     :
         (filetype & BIN_NCCHNFO)? "NCCHinfo options..."   :
         (filetype & TXT_SCRIPT) ? "Execute GM9 script"    :
-        (filetype & FONT_RIFF)  ? "Font options..."       :
+        (FTYPE_FONT(filetype))  ? "Font options..."       :
         (filetype & GFX_PNG)    ? "View PNG file"         :
         (filetype & HDR_NAND)   ? "Rebuild NCSD header"   :
         (filetype & NOIMG_NAND) ? "Rebuild NCSD header" : "???";
@@ -2056,12 +2056,12 @@ u32 FileHandlerMenu(char* current_path, u32* cursor, u32* scroll, PaneData** pan
         return 0;
     }
     else if (user_select == font) { // set font
-        u8* riff = (u8*) malloc(0x10000); // arbitrary, should be enough by far
-        if (!riff) return 1;
-        u32 riff_size = FileGetData(file_path, riff, 0x10000, 0);
-        if (riff_size) SetFontFromRiff(riff, riff_size);
+        u8* font = (u8*) malloc(0x10000); // arbitrary, should be enough by far
+        if (!font) return 1;
+        u32 font_size = FileGetData(file_path, font, 0x10000, 0);
+        if (font_size) SetFont(font, font_size);
         ClearScreenF(true, true, COLOR_STD_BG);
-        free(riff);
+        free(font);
         return 0;
     }
     else if (user_select == view) { // view gfx
@@ -2087,7 +2087,10 @@ u32 FileHandlerMenu(char* current_path, u32* cursor, u32* scroll, PaneData** pan
     }
     else if (user_select == setup) { // set as default (font)
         if (filetype & FONT_RIFF) {
-            if (SetAsSupportFile("font.riff", file_path))
+            if (SetAsSupportFile("font.frf", file_path))
+                ShowPrompt(false, "%s\nFont will be active on next boot", pathstr);
+        } else if (filetype & FONT_PBM) {
+            if (SetAsSupportFile("font.pbm", file_path))
                 ShowPrompt(false, "%s\nFont will be active on next boot", pathstr);
         }
         return 0;
@@ -2300,7 +2303,7 @@ u32 GodMode(int entrypoint) {
     #endif
 
     // init font
-    if (!SetFontFromRiff(NULL, 0)) return exit_mode;
+    if (!SetFont(NULL, 0)) return exit_mode;
 
     // show splash screen (if enabled)
     ClearScreenF(true, true, COLOR_STD_BG);
@@ -2320,13 +2323,20 @@ u32 GodMode(int entrypoint) {
         SetScreenBrightness(brightness);
 
     // custom font handling
-    if (CheckSupportFile("font.riff")) {
+    if (CheckSupportFile("font.frf")) {
         u8* riff = (u8*) malloc(0x10000); // arbitrary, should be enough by far
         if (riff) {
-            u32 riff_size = LoadSupportFile("font.riff", riff, 0x10000);
-            if (riff_size) SetFontFromRiff(riff, riff_size);
+            u32 riff_size = LoadSupportFile("font.frf", riff, 0x10000);
+            if (riff_size) SetFont(riff, riff_size);
             free(riff);
         }
+    } else if (CheckSupportFile("font.pbm")) {
+        u8* pbm = (u8*) malloc(0x10000); // arbitrary, should be enough by far
+        if (pbm) {
+            u32 pbm_size = LoadSupportFile("font.pbm", pbm, 0x10000);
+            if (pbm_size) SetFont(pbm, pbm_size);
+            free(pbm);
+        }
     }
 
     // check for embedded essential backup
@@ -2877,7 +2887,7 @@ u32 GodMode(int entrypoint) {
 #else
 u32 ScriptRunner(int entrypoint) {
     // init font and show splash
-    if (!SetFontFromPbm(NULL, 0)) return GODMODE_EXIT_POWEROFF;
+    if (!SetFont(NULL, 0)) return GODMODE_EXIT_POWEROFF;
     SplashInit("scriptrunner mode");
     u64 timer = timer_start();
 
diff --git a/arm9/source/system/vram0.h b/arm9/source/system/vram0.h
index 490e11a..62811a7 100644
--- a/arm9/source/system/vram0.h
+++ b/arm9/source/system/vram0.h
@@ -6,19 +6,19 @@
 
 // set default font
 #ifndef DEFAULT_FONT
-#define DEFAULT_FONT           "font_default.pbm"
+#define DEFAULT_FONT           "font_default.frf"
 #endif
 
 // known file names inside VRAM0 TAR
 #define VRAM0_AUTORUN_GM9      "autorun.gm9"
-#define VRAM0_FONT_PBM         DEFAULT_FONT
+#define VRAM0_FONT             DEFAULT_FONT
 #define VRAM0_SCRIPTS          "scripts"
 #define VRAM0_README_MD        "README_internal.md"
 #define VRAM0_SPLASH_PNG       FLAVOR "_splash.png"
 #define VRAM0_EASTER_BIN       "easter.bin"
 
 
-#define VRAM0_OFFSET	0x080C0000
+#define VRAM0_OFFSET    0x080C0000
 #define VRAM0_LIMIT     0x00040000
 
 #define TARDATA         ((void*) VRAM0_OFFSET)
diff --git a/data/font_default.frf b/data/font_default.frf
new file mode 100644
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diff --git a/resources/fonts/cp_437.txt b/resources/fonts/cp_437.txt
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diff --git a/resources/fonts/font_6x10.txt b/resources/fonts/font_6x10.txt
new file mode 100644
index 0000000..4ad1b89
--- /dev/null
+++ b/resources/fonts/font_6x10.txt
@@ -0,0 +1,35 @@
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diff --git a/utils/fontriff.py b/utils/fontriff.py
new file mode 100755
index 0000000..12ad52a
--- /dev/null
+++ b/utils/fontriff.py
@@ -0,0 +1,118 @@
+#!/usr/bin/env python3
+
+from argparse import ArgumentParser
+import struct
+from os import path
+
+parser = ArgumentParser(description="Creates an FRF font for GodMode9 from a PBM image")
+parser.add_argument("input", type=str, help="PBM image to convert from")
+parser.add_argument("output", type=str, help="out.to output to")
+parser.add_argument("width", type=int, help="character width")
+parser.add_argument("height", type=int, help="character height")
+parser.add_argument("-m", "--map", metavar="map.txt", type=str, help="character map (whitespace separated Unicode codepoints)")
+
+args = parser.parse_args()
+
+if(args.width > 8):
+    print("Fatal: Font width too large (Maximum is 8)")
+    exit(1)
+
+if(args.height > 10):
+    print("Fatal: Font height too large (Maximum is 10)")
+    exit(1)
+
+with open(args.input, "rb") as f:
+    # read PBM
+    pbm = f.read()
+    split = pbm.split(b"\n")
+    if split[0] != b"P4":
+        print("Fatal: Input is not a PBM file")
+        exit(1)
+
+    # skip comments
+    for i in range(1, len(split)):
+        if split[i][0] != ord("#"):
+            imgWidth = int(split[i].split()[0])
+            imgHeight = int(split[i].split()[1])
+            imgData = b"\n".join(split[i + 1:])
+            break
+
+    count = imgWidth * imgHeight // args.width // args.height
+    columns = imgWidth // args.width
+    fontMap = []
+
+    # prepare map
+    mapPath = args.map
+    if not mapPath and path.exists(args.input[:args.input.rfind(".")] + ".txt"):
+        mapPath = args.input[:args.input.rfind(".")] + ".txt"
+        print("Info: Using %s for font mappings" % mapPath)
+    if mapPath:
+        with open(mapPath, "r") as fontMapFile:
+            fontMapTemp = fontMapFile.read().split()
+            if (len(fontMapTemp) > count):
+                print("Fatal: Font map has more items than possible in image (%d items in map)" % count)
+                exit(1)
+            elif len(fontMapTemp) < count:
+                count = len(fontMapTemp)
+                print("Info: Font map has fewer items than possible in image, only using first %d" % count)
+
+            for item in fontMapTemp:
+                fontMap.append({"mapping": int(item, 16)})
+    else:
+        print("Warning: Font mapping not found, mapping directly to Unicode codepoints")
+        for i in range(count):
+            fontMap.append({"mapping": i})
+
+    # add unsorted tiles to map
+    for c in range(count):
+        fontMap[c]["bitmap"] = []
+        for row in range(args.height):
+            ofs = ((c // columns * args.height + row) * (imgWidth + ((8 - (imgWidth % 8)) if imgWidth % 8 != 0 else 0)) // 8)
+            bp0 = ((c % columns) * args.width) >> 3
+            bm0 = ((c % columns) * args.width) % 8
+            byte = (((imgData[ofs + bp0] << bm0) | ((imgData[ofs + bp0 + 1] >> (8 - bm0)) if ofs + bp0 + 1 < len(imgData) else 0)) & (0xFF << (8 - args.width))) & 0xFF
+            fontMap[c]["bitmap"].append(byte)
+
+    # remove duplicates
+    fontMap = list({x["mapping"]: x for x in fontMap}.values())
+    if len(fontMap) != count:
+        print("Info: %d duplicate mappings were removed" % (count - len(fontMap)))
+        count = len(fontMap)
+
+    # sort map
+    fontMap = sorted(fontMap, key=lambda x: x["mapping"])
+
+    # write file
+    with open(args.output, "wb") as out:
+        out.write(b"RIFF")
+        out.write(struct.pack("<L", 0))  # Filled at end
+
+        # metadata
+        out.write(b"META")
+        out.write(struct.pack("<LBBH", 4, args.width, args.height, count))
+
+        # character data
+        out.write(b"CDAT")
+        sectionSize = count * args.height
+        padding = 4 - sectionSize % 4 if sectionSize % 4 else 0
+        out.write(struct.pack("<L", sectionSize + padding))
+        for item in fontMap:
+            for px in item["bitmap"]:
+                out.write(struct.pack("B", px))
+        out.write(b"\0" * padding)
+
+        # character map
+        out.write(b"CMAP")
+        sectionSize = count * 2
+        padding = 4 - sectionSize % 4 if sectionSize % 4 else 0
+        out.write(struct.pack("<L", sectionSize + padding))
+        for item in fontMap:
+            out.write(struct.pack("<H", item["mapping"]))
+        out.write(b"\0" * padding)
+
+        # write final size
+        outSize = out.tell()
+        out.seek(4)
+        out.write(struct.pack("<L", outSize - 8))
+
+        print("Info: %s created with %d tiles." % (args.output, count))