cc9a6db853
Ref: #1379 This takes a naive approach to font-width computation, the most compute-intensive part of rendering badges. 1. Add the widths of the individual characters. - These widths are measured on startup using PDFKit. 2. For each character pair, add a kerning adjustment - The difference between the width of each character pair, and the sum of the characters' separate widths. - These are computed for each character pair on startup using PDFKit. 3. For a string with characters outside the printable ASCII character set, fall back to PDFKit. This branch averaged 0.041 ms in `makeBadge`, compared to 0.144 ms on master, a speedup of 73%. That was on a test of 10,000 consecutive requests (using the `benchmark-performance.sh` script, now checked in). The speedup applies to badges containing exclusively printable ASCII characters. It wouldn't be as dramatic on non-ASCII text. Though, we could add some frequently used non-ASCII characters to the cached set.
87 lines
2.3 KiB
JavaScript
Executable File
87 lines
2.3 KiB
JavaScript
Executable File
#!/usr/bin/env node
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'use strict';
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const { PDFKitTextMeasurer } = require('./text-measurer');
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const { makeBadge } = require('./make-badge');
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const svg2img = require('./svg-to-img');
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const colorscheme = require('./colorscheme.json');
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const defaults = require('./defaults');
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if (process.argv.length < 4) {
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console.log('Usage: badge subject status [:colorscheme] [.output] [@style]');
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console.log('Or: badge subject status right-color [left-color] [.output] [@style]');
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console.log();
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console.log(' colorscheme: one of '
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+ Object.keys(colorscheme).join(', ') + '.');
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console.log(' left-color, right-color:');
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console.log(' #xxx (three hex digits)');
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console.log(' #xxxxxx (six hex digits)');
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console.log(' color (CSS color)');
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console.log(' output:');
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console.log(' svg, png, jpg, or gif');
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console.log();
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console.log('Eg: badge cactus grown :green @flat');
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console.log();
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process.exit();
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}
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const fontPath = process.env.FONT_PATH || defaults.font.path;
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// Find a format specifier.
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let format = 'svg';
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let style = '';
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for (let i = 4; i < process.argv.length; i++) {
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if (process.argv[i][0] === '.') {
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format = process.argv[i].slice(1);
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process.argv.splice(i, 1);
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continue;
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}
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if (process.argv[i][0] === '@') {
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style = process.argv[i].slice(1);
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process.argv.splice(i, 1);
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continue;
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}
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}
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const subject = process.argv[2];
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const status = process.argv[3];
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let color = process.argv[4] || ':green';
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const colorA = process.argv[5];
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const badgeData = {text: [subject, status], format: format};
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if (style) {
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badgeData.template = style;
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}
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if (color[0] === ':') {
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color = color.slice(1);
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if (colorscheme[color] == null) {
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// Colorscheme not found.
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console.error('Invalid color scheme.');
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process.exit(1);
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}
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badgeData.colorscheme = color;
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} else {
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badgeData.colorB = color;
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if (colorA) { badgeData.colorA = colorA; }
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}
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// The widths are going to be off if Helvetica-Bold is used, though this
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// should print a warning.
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const measurer = new PDFKitTextMeasurer(fontPath, 'Helvetica-Bold');
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const svg = makeBadge(measurer, badgeData);
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if (/png|jpg|gif/.test(format)) {
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svg2img(svg, format)
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.then(data => {
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process.stdout.write(data);
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})
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.catch(err => {
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console.error(err);
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process.exit(1);
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})
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} else {
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console.log(svg);
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}
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