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Add ability to include only specific characters to save flash #461

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Add ability to include only specific characters to save flash #461

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968f89d
Add ability to include only specific characters to save flash
leres Jan 6, 2025
e925d6b
formatting style change the clang ci seems to want
leres Jan 7, 2025
9af3db7
try again (I can't find run-clang-format.py...)
leres Jan 7, 2025
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4 changes: 2 additions & 2 deletions fontconvert/Makefile
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Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
all: fontconvert

CC = gcc
CFLAGS = -Wall -I/usr/local/include/freetype2 -I/usr/include/freetype2 -I/usr/include
LIBS = -lfreetype
CFLAGS = -Wall -I/usr/local/include/freetype2 -I/usr/include/freetype2 -I/usr/include -I..
LIBS = -L/usr/local/lib -lfreetype

fontconvert: fontconvert.c
$(CC) $(CFLAGS) $< $(LIBS) -o $@
Expand Down
123 changes: 86 additions & 37 deletions fontconvert/fontconvert.c
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,7 @@ See notes at end for glyph nomenclature & other tidbits.
#include FT_GLYPH_H
#include FT_MODULE_H
#include FT_TRUETYPE_DRIVER_H
#include "../gfxfont.h" // Adafruit_GFX font structures
#include "gfxfont.h" // Adafruit_GFX font structures

#define DPI 141 // Approximate res. of Adafruit 2.8" TFT

Expand All @@ -50,75 +50,109 @@ void enbit(uint8_t value) {
}
}

#define NUMCHARS 0xff
static GFXglyph table[NUMCHARS];
static char used[NUMCHARS];
static char fontName[256];

int main(int argc, char *argv[]) {
int i, j, err, size, first = ' ', last = '~', bitmapOffset = 0, x, y, byte;
char *fontName, c, *ptr;
int i, j, k, err, size, first = ' ', last = '~', bitmapOffset = 0, x, y, byte;
char *cp, *ptr, *fn;
FT_Library library;
FT_Face face;
FT_Glyph glyph;
FT_Bitmap *bitmap;
FT_BitmapGlyphRec *g;
GFXglyph *table;
uint8_t bit;

// Parse command line. Valid syntaxes are:
// fontconvert [filename] [size]
// fontconvert [filename] [size] [last char]
// fontconvert [filename] [size] [first char] [last char]
// fontconvert [filename] [size] char1 char2 char2 ...
// Unless overridden, default first and last chars are
// ' ' (space) and '~', respectively
// When specific characters are used specs from the minimally
// sized space character is substitute at a cost of 6 bytes each
//
// Examples:
// # Output ., /, and 0-9
// fontconvert comic.ttf 20 46 57
// # Output ., and 0-9 (/ is included but renders as ' ')
// fontconvert comic.ttf 20 46 47 48 49 50 51 52 53 54 55 56 57

if (argc < 3) {
fprintf(stderr, "Usage: %s fontfile size [first] [last]\n", argv[0]);
fprintf(stderr, " %s fontfile size char1 char2 char3 ...\n", argv[0]);
return 1;
}

fn = argv[1];
size = atoi(argv[2]);

if (argc == 4) {
last = atoi(argv[3]);
} else if (argc == 5) {
first = atoi(argv[3]);
last = atoi(argv[4]);
}
if (argc >= 3 && argc <= 5) {
// (Optinally) pick first and last characters
if (argc == 4) {
last = atoi(argv[3]);
} else if (argc == 5) {
first = atoi(argv[3]);
last = atoi(argv[4]);
}

if (last < first) {
i = first;
first = last;
last = i;
}

if (last < first) {
i = first;
first = last;
last = i;
// Populate the used array
for (i = first; i <= last; ++i) {
used[i] = 1;
}
} else {
// Pick specific characters
first = 0x1ff;
last = 0;
for (i = 3; i < argc; ++i) {
j = atoi(argv[i]);
if (j < 0 || j > NUMCHARS) {
fprintf(stderr, "Invalid specific character %d\n", j);
return 1;
}
used[j] = 1;
if (first > j) {
first = j;
}
if (last < j) {
last = j;
}
}
}

ptr = strrchr(argv[1], '/'); // Find last slash in filename
ptr = strrchr(fn, '/'); // Find last slash in filename
if (ptr)
ptr++; // First character of filename (path stripped)
else
ptr = argv[1]; // No path; font in local dir.

// Allocate space for font name and glyph table
if ((!(fontName = malloc(strlen(ptr) + 20))) ||
(!(table = (GFXglyph *)malloc((last - first + 1) * sizeof(GFXglyph))))) {
fprintf(stderr, "Malloc error\n");
return 1;
}
ptr = fn; // No path; font in local dir.

// Derive font table names from filename. Period (filename
// extension) is truncated and replaced with the font size & bits.
strcpy(fontName, ptr);
strlcpy(fontName, ptr, sizeof(fontName));
ptr = strrchr(fontName, '.'); // Find last period (file ext)
if (!ptr)
ptr = &fontName[strlen(fontName)]; // If none, append
// Insert font size and 7/8 bit. fontName was alloc'd w/extra
// space to allow this, we're not sprintfing into Forbidden Zone.
sprintf(ptr, "%dpt%db", size, (last > 127) ? 8 : 7);
// Insert font size and 7/8 bit.
snprintf(ptr, sizeof(fontName) - (strlen(fontName) + 1), "%dpt%db", size,
(last > 127) ? 8 : 7);
// Space and punctuation chars in name replaced w/ underscores.
for (i = 0; (c = fontName[i]); i++) {
if (isspace(c) || ispunct(c))
fontName[i] = '_';
for (cp = fontName; *cp != '\0'; ++cp) {
if (isspace(*cp) || ispunct(*cp))
*cp = '_';
}

// Init FreeType lib, load font
if ((err = FT_Init_FreeType(&library))) {
fprintf(stderr, "FreeType init error: %d", err);
fprintf(stderr, "FreeType init error: %d\n", err);
return err;
}

Expand All @@ -130,8 +164,8 @@ int main(int argc, char *argv[]) {
FT_Property_Set(library, "truetype", "interpreter-version",
&interpreter_version);

if ((err = FT_New_Face(library, argv[1], 0, &face))) {
fprintf(stderr, "Font load error: %d", err);
if ((err = FT_New_Face(library, fn, 0, &face))) {
fprintf(stderr, "Font load error: %d\n", err);
FT_Done_FreeType(library);
return err;
}
Expand All @@ -145,13 +179,26 @@ int main(int argc, char *argv[]) {
// the right symbols, and that's not done yet.
// fprintf(stderr, "%ld glyphs\n", face->num_glyphs);

// Output the command line as a comment */
cp = strrchr(argv[0], '/');
if (cp == NULL)
cp = argv[0];
else
++cp;
printf("/* %s", cp);
for (i = 1; i < argc; ++i) {
printf(" %s", argv[i]);
}
printf(" */\n");
printf("const uint8_t %sBitmaps[] PROGMEM = {\n ", fontName);

// Process glyphs and output huge bitmap data array
for (i = first, j = 0; i <= last; i++, j++) {
// Use minimal sized blank for unused characters
k = used[i] ? i : ' ';
// MONO renderer provides clean image with perfect crop
// (no wasted pixels) via bitmap struct.
if ((err = FT_Load_Char(face, i, FT_LOAD_TARGET_MONO))) {
if ((err = FT_Load_Char(face, k, FT_LOAD_TARGET_MONO))) {
fprintf(stderr, "Error %d loading char '%c'\n", err, i);
continue;
}
Expand Down Expand Up @@ -215,7 +262,7 @@ int main(int argc, char *argv[]) {
if (i < last) {
printf(", // 0x%02X", i);
if ((i >= ' ') && (i <= '~')) {
printf(" '%c'", i);
printf(" '%c'", used[i] ? i : ' ');
}
putchar('\n');
}
Expand All @@ -231,11 +278,13 @@ int main(int argc, char *argv[]) {
printf(" (GFXglyph *)%sGlyphs,\n", fontName);
if (face->size->metrics.height == 0) {
// No face height info, assume fixed width and get from a glyph.
printf(" 0x%02X, 0x%02X, %d };\n\n", first, last, table[0].height);
printf(" 0x%02X, 0x%02X, %d ", first, last, table[0].height);
} else {
printf(" 0x%02X, 0x%02X, %ld };\n\n", first, last,
printf(" 0x%02X, 0x%02X, %ld ", first, last,
face->size->metrics.height >> 6);
}
// Make braces match
printf("};\n\n");
printf("// Approx. %d bytes\n", bitmapOffset + (last - first + 1) * 7 + 7);
// Size estimate is based on AVR struct and pointer sizes;
// actual size may vary.
Expand Down
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