-
Notifications
You must be signed in to change notification settings - Fork 0
/
atlast.html
525 lines (419 loc) · 17.8 KB
/
atlast.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
<style>
:root { --pale: #282828; --bg: #1d2021; --bg-toggle: #fbf1f7; --shadow: #111; --border: #3c3836; --muted: #d5c4a1 }
html
{ background: var(--pale);
color: #fbf1f7;
font: 18px/1.25 'Tex Gyre Adventor', corbel, sans-serif }
body
{ min-height: 100%;
display: flex;
justify-content: center;
align-items: center;
grid-gap: 1em }
.canvas-float
{ position: sticky; top: 0 }
.canvas-float label, .canvas-float small
{ background: var(--pale);
outline: 2px solid var(--pale) }
textarea, input
{ font: inherit; color: inherit }
textarea, .option-group input
{ width: 100% }
h1, label
{ color: var(--muted) }
label
{ font-size: smaller }
a, input, textarea, canvas, button, code
{ color: inherit;
background-color: var(--bg);
border: 1px solid var(--border);
border-radius: 4px;
box-shadow: 1px 1px var(--shadow) }
code
{ padding: .2ch .5ch }
a, input, textarea, canvas, button
{ padding: .5ch 1.5ch;
font: inherit;
transition: background-color 166ms, color 166ms }
#save
{ --bg: #076678;
--border: #458588;
background-image: radial-gradient(ellipse at bottom, var(--border), transparent);
display: inline-block }
#save:hover
{ --bg: #458588 }
button:enabled
{ cursor: pointer }
button:enabled:hover
{ background: #3c3836 }
button:disabled
{ color: var(--muted);
cursor: progress }
label > .help
{ border-radius: 1ch;
padding: .3ch .9ch;
font-size: small;
vertical-align: top;
text-decoration-style: dotted }
body > div
{ max-width: 80ch; flex: 1 }
p
{ flex-grow: 1; margin: 1ch 0 }
.option-group
{ display: flex; grid-gap: 1.5ch }
.smol-button-thing
{ flex-grow: 0; display: flex; align-items: end }
hr
{ border: 0;
height: 1px;
background: var(--bg);
box-shadow: 1px 1px inset var(--shadow),
1px 1px var(--border) }
</style>
<body>
<div>
<p class="canvas-float">
<label>Preview <button id="toggleCanvasBackground" class="help">◐</button></label>
<small id="preview-details"><b>?</b>x<b>?</b>, row height <b>?</b> px, size <b>?</b> kbytes</small>
<input id="canvasBackground" type="hidden" />
<canvas></canvas>
</p>
<p><label for="text">Text</label>
<textarea id="text" rows="6">!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVW
XYZ[×]^_`abcdefghijklmnopqrstuvwxyz{}~\ẞÀÁÂÃÄÅÆÇÈÉÊËÌÍ
ÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞŸßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ¿¡«»°Š
ŒŽšœž™©®€£¢“‘”…’</textarea>
<div class="option-group">
<p><label for="font">Font <a class="help" target="_blank" href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/font">?</a></label>
<input id="font" value="18px Tex Gyre Adventor"/></input>
<p><label for="color">Color <a class="help" target="_blank" href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/fillStyle">?</a></label>
<input id="color" value="white"/></input>
</div>
<div class="option-group">
<p><label for="shadowColor">Shadow <a class="help" target="_blank" href="https://developer.mozilla.org/en-US/docs/Web/CSS/color_value">?</a></label>
<input id="shadowColor" value="rgb(33 33 33 / 80%)" size=30 /></input>
<p><label for="shadowX">X Offset<a class="help" target="_blank" href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/shadowOffsetX">?</a></label>
<input id="shadowX" value="0" /></input>
<p><label for="shadowY">Y Offset<a class="help" target="_blank" href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/shadowOffsetY">?</a></label>
<input id="shadowY" value="0"/></input>
<p><label for="shadowBlur">Blur<a class="help" target="_blank" href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/shadowBlur">?</a></label>
<input id="shadowBlur" value="0"/></input>
</div>
<div class="option-group">
<p><label for="outlineStyle">Outline<a class="help" target="_blank" href="https://developer.mozilla.org/en-US/docs/Web/CSS/color_value">?</a></label>
<input id="outlineStyle" value="rgb(33 33 33 / 80%)"/></input>
<p><label for="outlineThicc">Thickness<a class="help" target="_blank" href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/lineWidth">?</a></label>
<input id="outlineThicc" value="0"/></input>
</div>
<div>
<div class="option-group">
<p><label for="externalFontUrl">External Font URL<a class="help" target="_blank" href="https://developer.mozilla.org/en-US/docs/Web/API/FontFace/FontFace">?</a></label>
<input id="externalFontUrl" /></input>
<p class="smol-button-thing">
<button id="loadExternalFont">Load Font</button>
</div>
<p><small id="externalFontStatus"></small>
</div>
<div class="option-group">
<p><label for="saveName">Filename</label>
<input id="saveName" value="GameFont.tga"/></input>
<p class="smol-button-thing">
<a id="save" download="GameFont.tga">Save TGA</a>
</div>
<hr>
<p><small>"Advanced" options ... mostly to do with spacing.</small>
<p>The built-in font metrics seem generous sometimes, this allows shrinking font measurements from the browser. If you find the individual glyphs in the generated atlas have columns of whitespace on left or right sides, increase the trim values. But if the left and right edges are clipped, decrease them.
<p>When Outline Thickness is used above, additional padding is added to each four sides of each glyph given by the product of Outline Thickness & Outline Spacing Factor.
<div class="option-group">
<p><label for="trimLeft">Trim Left</label>
<input id="trimLeft" value="0.12"/></input>
<p><label for="trimWidth">Trim Width</label>
<input id="trimWidth" value="0.12"/></input>
<p><label for="outlineFactor">Outline Spacing Factor</label>
<input id="outlineFactor" value="0.5"/></input>
</div>
<hr>
<h1>About</h1>
<p>Hi! This makes the text portion of a GameFont.tga for Civilization IV.
<p>The TGA file contains invisible pink <code>rgb(255 0 255 / 0%)</code> pixels as guides. With teal <code>rgb(0 255 255 / 0%)</code> pixels as baseline/descent indicators.
<p>The "Font" input field allows changing some font options like size and family. It should use fonts available to your browser; probably whatever is installed on your system. You can also try using an external font by using the font family "External" and providing a font URL and clicking "Load Font". Here are some example URLs:
<ul>
<li>Quicksand <code>url(https://fonts.gstatic.com/s/quicksand/v30/6xK-dSZaM9iE8KbpRA_LJ3z8mH9BOJvgkP8o58a-wg.woff2)</code></li>
<li>Oxygen <code>url(https://fonts.gstatic.com/s/oxygen/v5/qBSyz106i5ud7wkBU-FrPevvDin1pK8aKteLpeZ5c0A.woff2)</code></li>
</ul>
<p>If you use an external font, make sure it includes the right unicode range or it might not show up.
</div>
<script>
const BYTES_PER_PX = 4;
const FRAME_WIDTH = 1;
const FRAME_COLOR = { r: 255, g: 0, b: 255, a: 0 }
const DESCENT_COLOR = { r: 0, g: 255, b: 255, a: 0 }
const createState = (current) => (next) => [current, current = next]
const createMemo = (current) => (next) =>
current === next ? [false, current]
: [true, current, current = next]
;(() => {
const canvas = document.querySelector("canvas")
const canvasBackground = document.querySelector("#canvasBackground")
const inputs = [document.querySelector("#text"), ...document.querySelectorAll("input:not([type=hidden])")];
const options = () => Object.fromEntries(inputs.map(i => [i.id, i.value]))
const toggleCanvasBackground = () => canvasBackground.value = canvasBackground.value ? "" : "var(--bg-toggle)"
canvas.style.setProperty("--bg", canvasBackground.value)
document.querySelector("#toggleCanvasBackground")
.addEventListener("click", () => canvas.style.setProperty("--bg", toggleCanvasBackground()))
const setExternalFont = createState(null)
const setExternalFontStatus = (v) => [
(document.querySelector("#loadExternalFont").disabled = "pending" in v),
(document.querySelector("#externalFontStatus").innerText = fontStatusText(v)),
redraw({ canvas, ...options() })
]
document.querySelector("#loadExternalFont")
.addEventListener("click", () => loadExternalFont({ setExternalFont, setExternalFontStatus }))
loadExternalFont({ setExternalFont, setExternalFontStatus })
inputs.forEach(i => i.addEventListener("input", () => redraw({ canvas, ...options() })))
redraw({ canvas, ...options() })
})()
function loadExternalFont({ setExternalFont, setExternalFontStatus }) {
let { value } = document.querySelector("#externalFontUrl")
/* the external font value should be `url({url})`,
* if we just got a url then surround it in "url()" */
try {
if (new URL(value))
value = `url(${value})`
} catch (_) { }
const [oldFont, newFont] = setExternalFont(value ? new FontFace("External", value) : null);
if (oldFont)
document.fonts.delete(oldFont)
if (newFont) {
setExternalFontStatus({ "pending": newFont })
newFont.load().then((...result) => setExternalFontStatus({ "loaded": result }),
(...result) => setExternalFontStatus({ "failed": result }))
document.fonts.add(newFont)
} else {
setExternalFontStatus({})
}
}
function fontStatusText(v) {
if (!v)
return ""
if ("pending" in v)
return "pending..."
else if ("loaded" in v)
return `loaded font family as "External" (try "18px External" in the font field to use it)`
else
return Object.entries(v).map(([k, v]) => `${k}: ${v}`)
}
function redraw({ canvas, text, font, color, shadowColor, shadowX, shadowY, shadowBlur, outlineStyle, outlineThicc, trimLeft, trimWidth, outlineFactor, saveName }) {
const ctx = canvas.getContext("2d")
ctx.font = font
ctx.fillStyle = color
ctx.shadowColor = shadowColor
ctx.shadowOffsetX = shadowX
ctx.shadowOffsetY = shadowY
ctx.shadowBlur = shadowBlur
outlineThicc = parseFloat(outlineThicc) || 0
outlineFactor = parseFloat(outlineFactor) || 0
/* this is mostly made up, the shadowBlur doesn't seem right at all */
const shadowLeft = Math.min(ctx.shadowOffsetX, 0)/* - 0.5 * ctx.shadowBlur */ - outlineFactor * outlineThicc
const shadowRight = Math.max(ctx.shadowOffsetX, 0)/* + 0.5 * ctx.shadowBlur */ + outlineFactor * outlineThicc
const shadowUp = Math.min(ctx.shadowOffsetY, 0)/* - 0.5 * ctx.shadowBlur */ - outlineFactor * outlineThicc
const shadowDown = Math.max(ctx.shadowOffsetY, 0)/* + 0.5 * ctx.shadowBlur */ + outlineFactor * outlineThicc
trimLeft = parseFloat(trimLeft) || 0;
trimWidth = parseFloat(trimWidth) || 0;
const metrics = Array.from(text)
.map(s => {
const {
/* usually negative */
actualBoundingBoxLeft: leftf,
actualBoundingBoxRight: rightf,
actualBoundingBoxAscent: ascentf,
/* positive for low hanging things like g, negative for high up stuff like ` */
actualBoundingBoxDescent: descentf,
} = ctx.measureText(s)
return {
s,
isLineWrap: !leftf && !rightf,
left: Math.ceil(leftf - shadowLeft - trimLeft),
width: Math.ceil(leftf - shadowLeft - trimLeft) + Math.ceil(rightf + shadowRight - trimWidth),
/* ascent is the distance from the bottom or baseline to the top of the glyph.
* descent is same distance but to the bottom of the glyph. */
height: Math.ceil(ascentf - shadowUp + descentf + shadowDown),
/* A positive descent means the character draws below the y passed to
* fillText(). Decrease y so we draw higher as to not rasterize past
* textHeight. Use descent later to draw the cyan descent marker pixel
* in the frame.
*
* A positive shadowY is shadowDown, is added to the descent as it
* increases the hangy-downyness of what is drawn. */
descent: Math.max(Math.ceil(descentf + shadowDown), 0),
}
})
const textHeight = Math.max(0, ...metrics.map(({ height }) => height))
const lineHeight = textHeight + FRAME_WIDTH
{ /* update canvas width and height to fit the given text */
const w = longest_line_width(metrics) || 1
const h = line_count(metrics) * lineHeight
set_canvas_size(canvas, { w, h })
}
{ /* draw text */
let x = 0;
let y = textHeight;
metrics.forEach(({ s, isLineWrap, left, width, descent }) => {
if (isLineWrap) {
x = 0
y += lineHeight
return
}
/* drawn with bottom-left at the given x and y */
if (parseFloat(outlineThicc) > 0) {
ctx.save();
/* This feature probably sucks compared to drawing the shadow multiple
* times. Instead of lineJoin round, setting miterLimit to 4 with font
* '24px Times' looks a bit * better but makes artifacting for roundier
* fonts. This is okay more generally. Uhg... */
ctx.lineJoin = 'round'
ctx.lineWidth = outlineThicc
ctx.strokeStyle = outlineStyle
ctx.strokeText(s, x + left, y - descent)
ctx.restore();
}
ctx.fillText(s, x + left, y - descent)
x += width + FRAME_WIDTH
})
}
const buf = ctx.getImageData(0, 0, canvas.width, canvas.height)
const pixelsPerRow = buf.width
{ /* draw pink and teal frame */
let x = 0;
let y = 0;
[...metrics, { isLineWrap: true }].forEach(({ s, isLineWrap, width, descent }, i) => {
if (isLineWrap) {
/* fill the end of the this line with pink rows */
for (let nextLine = y + lineHeight; y < nextLine; y++)
for (let nextRow = (y + 1) * pixelsPerRow,
p = y * pixelsPerRow + x; p < nextRow; p++)
set_rgba(buf, p, FRAME_COLOR)
x = 0
return
}
const bottomRight = x + width + (y + textHeight) * pixelsPerRow
/* right edge frame */
for (let p = y * pixelsPerRow + x + width; p <= bottomRight; p += pixelsPerRow)
set_rgba(buf, p, FRAME_COLOR)
/* bottom edge frame */
for (let p = (y + textHeight) * pixelsPerRow + x; p < bottomRight; p++)
set_rgba(buf, p, FRAME_COLOR)
/* descent pixel */
if (descent > 0)
set_rgba(buf, bottomRight - (descent + 1) * pixelsPerRow, DESCENT_COLOR)
x += width + FRAME_WIDTH
})
/* This doesn't seem to update the canvas with our transparent pixels.
* At least in Firefox, after calling putImageData(), if we get the buffer
* back with getImageData() the FRAME_COLOR pixels set above will just be
* black. So putImageData() is useful when making visual changes, when
* testing with a non-zero alpha channel, but doesn't really do anything
* here normally. */
ctx.putImageData(buf, 0, 0)
}
const tga = new Blob([tga_header(buf), tga_data(buf)], { type: "image/x-tga" })
{ /* update save button */
const a = document.querySelector("#save")
if (a.href)
URL.revokeObjectURL(a.href)
a.href = URL.createObjectURL(tga)
a.download = saveName
}
{
/* update preview details */
const details = document.querySelector("#preview-details").children;
[canvas.width, canvas.height, lineHeight, tga.size / 1000]
.map(i => i.toLocaleString())
.forEach((v, i) => (details[i].innerText = v))
}
}
/* https://stackoverflow.com/questions/15661339/how-do-i-fix-blurry-text-in-my-html5-canvas */
function set_canvas_size(canvas, { w, h }) {
let ctx = canvas.getContext("2d")
const { font, fillStyle, shadowColor, shadowOffsetX, shadowOffsetY, shadowBlur, lineWidth, strokeStyle } = ctx
const dpr = window.devicePixelRatio || 1
canvas.width = w
canvas.height = h
canvas.style.width = (w / dpr) + "px"
canvas.style.height = (h / dpr) + "px"
ctx.font = font
ctx.fillStyle = fillStyle
ctx.shadowColor = shadowColor
ctx.shadowOffsetX = shadowOffsetX
ctx.shadowOffsetY = shadowOffsetY
ctx.shadowBlur = shadowBlur
ctx.lineWidth = lineWidth
ctx.strokeStyle = strokeStyle
return dpr
}
/* takes an `ImageData` from `CanvasRenderingContext2D.getImageData()`
* returns Uint8Array
*
* At least in Firefox, canvas.toBlob() and canvas.toDataURL() both fuck up
* transparent pixels and drop rgb channel data. It's so stupid. Probably
* has something to do how it encodes pngs. So we encode it as a TGA because
* it's stupid simple in this case. */
function tga_header(image) {
// https://en.wikipedia.org/wiki/Truevision_TGA#Header
const TYPE = 0x02
const WIDTH = 0x0c
const HEIGHT = 0x0e
const DEPTH = 0x10
const FLAGS = 0x11
const tga = new Uint8Array(0x12)
tga[TYPE] = 0x02 /* uncompressed true-color image */
tga[WIDTH] = image.width
tga[WIDTH+1] = image.width >> 8
tga[HEIGHT] = image.height
tga[HEIGHT+1] = image.height >> 8
tga[DEPTH] = 32
tga[FLAGS] = 0b10_1000 /* top to bottom & left to right + 8 bit alpha channel bit depth */
return tga
}
/* Image data appears to be BGRA instead of RGBA? wut
*
* Copies image buffer into a new Uint8Array with channels in BGRA order. */
function tga_data(image) {
const tga = new Uint8Array(image.data.length)
for (let i = 0; i < image.width * image.height; i++) {
tga[i * 4 + 2] = image.data[i * 4 + 0] /* r */
tga[i * 4 + 1] = image.data[i * 4 + 1] /* g */
tga[i * 4 + 0] = image.data[i * 4 + 2] /* b */
tga[i * 4 + 3] = image.data[i * 4 + 3] /* a */
}
return tga
}
/* longest line by glyph width, not number of glyphs.
*
* sums ceil width plus one invisible frame pixel */
function longest_line_width(metrics) {
let longest = 0
let run = 0
metrics.forEach(({ isLineWrap, width }) => {
if (isLineWrap) {
longest = Math.max(longest, run)
run = 0
} else {
run += width + FRAME_WIDTH
}
})
return Math.max(longest, run)
}
/* one plus the number of line wraps */
function line_count(metrics) {
return 1 + metrics.filter(({ isLineWrap }) => isLineWrap).length
}
function set_rgba(image, p, { r, g, b, a }) {
p *= BYTES_PER_PX
image.data[p + 0] = r
image.data[p + 1] = g
image.data[p + 2] = b
image.data[p + 3] = a
}
</script>
</body>