Espruino/scripts/build_vector_font.js
2020-05-23 14:12:49 +01:00

536 lines
16 KiB
JavaScript
Executable File

#!/usr/bin/nodejs
/* This is a super hacky bit of code that takes a specially formatted SVG file
and creates an Espruino vector font from it.
*/
// SVG contents from http://forum.espruino.com/conversations/347368/#comment15288563
// Converted with https://nebbishhacker.github.io/svg2bangle/ tolerance 0
var polyImg = [
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];
var charData = [];
var firstChar=255, lastChar=0;
var maxPolyLen = 0;
polyImg.forEach(function(polyb64) {
let buf = new Buffer(polyb64, 'base64');
var minx=1000,maxx=-1,miny=1000,maxy=-1;
var poly = [];
for (var i=0;i<buf.length;i+=2) {
var x = buf.readUInt8(i);
var y = buf.readUInt8(i+1);
if (x<minx) minx=x;
if (y<miny) miny=y;
if (x>maxx) maxx=x;
if (y>maxy) maxy=y;
poly.push((x&15)+((y&15)<<4));
}
if (poly.length > maxPolyLen)
maxPolyLen = poly.length;
var cx = minx>>4;
var cy = miny>>4;
var dx = maxx>>4;
var dy = maxy>>4;
if (cx!=dx || cy!=dy) console.log("Char straddles boundary!");
var charNumber = cx + (cy*16);
if (charNumber < 240 && charNumber > lastChar) lastChar = charNumber;
if (charNumber < firstChar) firstChar = charNumber;
if (charData[charNumber]===undefined)
charData[charNumber] = [];
charData[charNumber].push(poly);
});
function outputCharCode(c, char) {
vector_font_c += `// ${c}\n`;
if (char!==undefined && char.length) {
var elements = 0;
char.forEach((poly,n) => {
var last = n == char.length-1;
vector_font_c += poly.join(",")+
","+(last?"VF_END_OF_CHAR":"VF_END_OF_POLY")+",\n";
elements += poly.length+1;
});
return elements;
} else {
vector_font_c += "VF_END_OF_CHAR,\n";
return 1;
}
}
var vector_font_c = `/*
* This file is part of Espruino, a JavaScript interpreter for Microcontrollers
*
* Copyright (C) 2020 Gordon Williams <gw@pur3.co.uk>
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* ----------------------------------------------------------------------------
* Machine generated vector font header (by build_vector_font.sh)
* ----------------------------------------------------------------------------
*/
#ifndef NO_VECTOR_FONT
#include "graphics.h"
const uint8_t vfFirstChar = ${firstChar};
const uint8_t vfLastChar = ${lastChar};
#define VF_END_OF_POLY 0xFE
#define VF_END_OF_CHAR 0xFF
#define VF_SCALE 12
#define VF_OFFSET_Y (0)
static const uint8_t vfPolys[] IN_FLASH_MEMORY = {
`;
for (var c=firstChar;c<=lastChar;c++) {
var char = charData[c];
outputCharCode(c, char);
}
var accentIndices = [];
vector_font_c += `};
static const uint8_t vfAccentPolys[] IN_FLASH_MEMORY = {
`;
var n = 0;
for (var c=240;c<247;c++) {
var char = charData[c];
accentIndices[c-240] = n;
n += outputCharCode(c, char);
}
vector_font_c += `
};
static const uint8_t vfAccentPolyIndices[] = {${accentIndices.join(",")}};
static const uint8_t *vfGetCharPtr(char sch, const uint8_t **accentPtr, int *accentX, int *accentY) {
unsigned char ch = (unsigned char)sch;
if (ch>=192) {
// 012345 correspond to 0=grave,1=acute,2=circumflex,3=tilde,4=umlaut,5=ring,6=i without dot
char *chrMap = "AAAAAA EEEEIIII NOOOOO UUUUY aaaaaa eeeeiiiionooooo uuuuy y";
char *accMap = "012345 01240124 301234 01241 012345 01240124+301234 01241 4";
if (ch>=192) {
int i = ch-192;
unsigned char chReplacement = (unsigned char)chrMap[i];
if (chReplacement!=' ') {
ch = chReplacement;
if (accentPtr) {
char acc = accMap[i];
*accentX = 0;
*accentY = 0;
if (acc>='0' && acc<='5') {
*accentPtr = &vfAccentPolys[vfAccentPolyIndices[acc-'0']];
if (ch>='a' && ch<='z') { // lowercase
*accentX = -2;
*accentY = -4;
} else { // uppercase
*accentY = -8;
}
if (ch=='I') *accentX -= 3;
if (ch=='i') {
*accentX -= 2;
return &vfAccentPolys[vfAccentPolyIndices[6]]; // use i without .
}
} else if (acc!=' ') {
*accentPtr = vfGetCharPtr(acc, NULL,NULL,NULL);
if (acc=='+') *accentY = -4;
}
}
}
}
}
if (ch<vfFirstChar || ch>vfLastChar) return NULL;
if (ch==vfFirstChar) return vfPolys;
int charCounter = ((uint8_t)ch) - vfFirstChar;
for (unsigned int p=0;p < sizeof(vfPolys);p++) {
if (vfPolys[p] == VF_END_OF_CHAR) {
charCounter--;
if (charCounter==0)
return &vfPolys[p+1];
}
}
return 0; // we went past the end
}
// prints character, returns width
unsigned int vfDrawCharPtr(JsGraphics *gfx, int x1, int y1, int size, const uint8_t *charPtr) {
x1 = x1<<4;
y1 = y1<<4;
short poly[${maxPolyLen*2}];
int polyLen = 0;
int w = 0;
while (*charPtr!=VF_END_OF_CHAR) {
if (*charPtr==VF_END_OF_POLY) {
graphicsFillPoly(gfx, polyLen, poly);
polyLen = 0;
} else {
uint8_t vertex = *charPtr;
int vx = vertex&15;
int vy = vertex>>4;
if (vx>w) w=vx;
poly[polyLen*2 ] = (short)(x1 + vx*size*16/VF_SCALE);
poly[polyLen*2+1] = (short)(y1 + (vy+VF_OFFSET_Y)*size*16/VF_SCALE);
polyLen++;
}
charPtr++;
}
graphicsFillPoly(gfx, polyLen, poly);
return (unsigned int)(((w+1)*size*16/VF_SCALE+7)>>4);
}
// returns the width of a character
unsigned int graphicsVectorCharWidth(JsGraphics *gfx, unsigned int size, char ch) {
NOT_USED(gfx);
const uint8_t *p = vfGetCharPtr(ch, NULL,NULL,NULL);
if (!p) return (unsigned int)(size/2);
int w = 0;
while (*p!=VF_END_OF_CHAR) {
if (*p!=VF_END_OF_POLY) {
uint8_t vertex = *p;
int vx = vertex&15;
if (vx>w) w=vx;
}
p++;
}
return (unsigned int)(((w+1)*size*16/VF_SCALE+7)>>4);
}
// prints character, returns width
unsigned int graphicsFillVectorChar(JsGraphics *gfx, int x1, int y1, int size, char ch) {
const uint8_t *accentPtr = 0;
int accentX, accentY;
const uint8_t *charPtr = vfGetCharPtr(ch, &accentPtr, &accentX, &accentY);
if (!charPtr) return (unsigned int)(size/2);
unsigned int w = vfDrawCharPtr(gfx, x1, y1, size, charPtr);
unsigned int w2 = 0;
if (accentPtr)
w2 = vfDrawCharPtr(gfx, x1 + ((accentX*size*16/VF_SCALE)>>4), y1 + ((accentY*size*16/VF_SCALE)>>4), size, accentPtr);
return (w2>w)?w2:w;
}
#endif
`;
var vector_font_h = `/*
* This file is part of Espruino, a JavaScript interpreter for Microcontrollers
*
* Copyright (C) 2020 Gordon Williams <gw@pur3.co.uk>
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* ----------------------------------------------------------------------------
* Machine generated vector font header (by build_vector_font.sh)
* ----------------------------------------------------------------------------
*/
#ifndef NO_VECTOR_FONT
#include "graphics.h"
// returns the width of a character
unsigned int graphicsVectorCharWidth(JsGraphics *gfx, unsigned int size, char ch);
// prints character, returns width
unsigned int graphicsFillVectorChar(JsGraphics *gfx, int x1, int y1, int size, char ch);
#endif
`;
require("fs").writeFileSync(__dirname + "/../libs/graphics/vector_font.c", vector_font_c);
require("fs").writeFileSync(__dirname + "/../libs/graphics/vector_font.h", vector_font_h);