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
|
// src/occlusion.js
//
// A tiny "hide ぶるべー behind this" mask editor.
//
// WHY: the background is a fixed image, so hiding the character behind a tree
// is a 2D masking job, not a depth-estimation one. The user taps the object;
// a magic wand (see floodfill.js) marks it. The editor hands back two PNGs:
//
// mask - opaque where the object is, used by the export to punch the
// character out there (`destination-out`)
// inverse - transparent where the object is, used as a CSS `mask-image` on
// the WebGL canvas so the live preview hides it too
//
// Both are in the canvas' CSS pixel space, so the editor is handed the
// backdrop *as already painted* (fit, scale, offset, blur, darken applied by
// main.js) rather than the raw photo. That keeps the mask aligned with what
// the export will draw.
import { floodFill } from './floodfill.js';
const DEFAULT_TOLERANCE = 32;
/**
* @param {HTMLCanvasElement} backdrop the backdrop painted at the canvas' CSS
* size (the same pixels the export will composite)
* @param {HTMLCanvasElement|null} character a transparent-background render of
* the character, drawn faintly so the user can aim
* @param {{ left:number, top:number, width:number, height:number }} rect the
* canvas' on-screen rectangle
* @returns {Promise<{mask:string, inverse:string}|null>} null when cancelled
*/
export function openOcclusionEditor({ backdrop, character = null, rect }) {
return new Promise((resolve) => {
const width = Math.max(1, Math.round(rect.width));
const height = Math.max(1, Math.round(rect.height));
const root = document.createElement('div');
root.className = 'occlusion-editor';
root.style.cssText = [
'position:fixed',
`left:${rect.left}px`,
`top:${rect.top}px`,
`width:${width}px`,
`height:${height}px`,
'z-index:100',
'background:#111',
'overflow:hidden',
'touch-action:none',
'user-select:none',
'font:13px system-ui, "Hiragino Sans", "Yu Gothic UI", sans-serif',
].join(';');
// The backdrop, exactly as the studio paints it.
const photo = document.createElement('canvas');
photo.width = width;
photo.height = height;
photo.style.cssText = 'position:absolute;inset:0;width:100%;height:100%;cursor:crosshair;';
const pctx = photo.getContext('2d', { willReadFrequently: true });
pctx.drawImage(backdrop, 0, 0, width, height);
const pixels = pctx.getImageData(0, 0, width, height).data;
// A faint copy of ぶるべー, so the user can see what is being covered.
const ghost = document.createElement('canvas');
ghost.width = width;
ghost.height = height;
ghost.style.cssText = 'position:absolute;inset:0;width:100%;height:100%;opacity:0.55;pointer-events:none;';
if (character) ghost.getContext('2d').drawImage(character, 0, 0, width, height);
// The mask: opaque white where the object is.
const mask = document.createElement('canvas');
mask.width = width;
mask.height = height;
mask.style.cssText = 'position:absolute;inset:0;width:100%;height:100%;opacity:0.55;pointer-events:none;';
const mctx = mask.getContext('2d');
const maskImage = mctx.createImageData(width, height);
const bar = document.createElement('div');
bar.style.cssText = [
'position:absolute',
'left:0', 'right:0', 'top:0',
'display:flex', 'flex-wrap:wrap', 'gap:8px', 'align-items:center',
'padding:8px 10px',
'background:rgba(20,16,28,0.86)', 'color:#fff',
'box-sizing:border-box',
].join(';');
const title = document.createElement('strong');
title.textContent = '隠すマスク';
const hintText = document.createElement('span');
hintText.textContent = '隠したい物（木・建物など）をタップ。何回でも追加できます';
hintText.style.cssText = 'opacity:0.8;flex:1 1 220px;';
const toleranceWrap = document.createElement('label');
toleranceWrap.style.cssText = 'display:flex;gap:6px;align-items:center;white-space:nowrap;';
toleranceWrap.append(document.createTextNode('にじみ'));
const tolerance = document.createElement('input');
tolerance.type = 'range';
tolerance.min = '0';
tolerance.max = '100';
tolerance.step = '1';
tolerance.value = String(DEFAULT_TOLERANCE);
tolerance.style.width = '110px';
toleranceWrap.append(tolerance);
const button = (label, onClick) => {
const el = document.createElement('button');
el.type = 'button';
el.textContent = label;
el.style.cssText = 'padding:4px 10px;border:1px solid rgba(255,255,255,0.35);border-radius:6px;background:rgba(255,255,255,0.1);color:#fff;cursor:pointer;';
el.addEventListener('click', onClick);
return el;
};
const undoStack = [];
bar.append(
title,
hintText,
toleranceWrap,
button('クリア', () => {
undoStack.length = 0;
maskImage.data.fill(0);
mctx.putImageData(maskImage, 0, 0);
}),
button('キャンセル', () => { cleanup(); resolve(null); }),
button('決定', () => {
cleanup();
resolve({ mask: mask.toDataURL('image/png'), inverse: invertedDataUrl(mask, width, height) });
}),
);
root.append(photo, ghost, mask, bar);
document.body.append(root);
function cleanup() {
root.remove();
window.removeEventListener('keydown', onKeydown);
}
/** @param {string} dataUrl */
function invertedDataUrl(source, w, h) {
const out = document.createElement('canvas');
out.width = w;
out.height = h;
const ctx = out.getContext('2d');
ctx.fillStyle = '#fff';
ctx.fillRect(0, 0, w, h);
ctx.globalCompositeOperation = 'destination-out';
ctx.drawImage(source, 0, 0);
return out.toDataURL('image/png');
}
photo.addEventListener('pointerdown', (event) => {
if (event.button !== 0) return;
const r = photo.getBoundingClientRect();
const before = new Uint8ClampedArray(maskImage.data);
const count = floodFill({
pixels,
mask: maskImage.data,
width,
height,
x: event.clientX - r.left,
y: event.clientY - r.top,
tolerance: Number(tolerance.value),
});
if (!count) return;
undoStack.push(before);
if (undoStack.length > 5) undoStack.shift();
mctx.putImageData(maskImage, 0, 0);
});
// Ctrl/⌘+Z takes back the last tap, which is the mistake people make most.
function onKeydown(event) {
if (!(event.ctrlKey || event.metaKey) || event.key.toLowerCase() !== 'z') return;
const before = undoStack.pop();
if (!before) return;
maskImage.data.set(before);
mctx.putImageData(maskImage, 0, 0);
event.preventDefault();
}
window.addEventListener('keydown', onKeydown);
});
}
|
