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Commit Description:
fix wrong merge
Commit Description:
fix wrong merge
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node_modules/fontkit/src/glyph/TTFGlyphEncoder.js
| 158 lines
| 4.0 KiB
| application/javascript
| JavascriptLexer
|
| r789 | import r from 'restructure'; | |||
| // Flags for simple glyphs | ||||
| const ON_CURVE = 1 << 0; | ||||
| const X_SHORT_VECTOR = 1 << 1; | ||||
| const Y_SHORT_VECTOR = 1 << 2; | ||||
| const REPEAT = 1 << 3; | ||||
| const SAME_X = 1 << 4; | ||||
| const SAME_Y = 1 << 5; | ||||
| class Point { | ||||
| static size(val) { | ||||
| return val >= 0 && val <= 255 ? 1 : 2; | ||||
| } | ||||
| static encode(stream, value) { | ||||
| if (value >= 0 && value <= 255) { | ||||
| stream.writeUInt8(value); | ||||
| } else { | ||||
| stream.writeInt16BE(value); | ||||
| } | ||||
| } | ||||
| } | ||||
| let Glyf = new r.Struct({ | ||||
| numberOfContours: r.int16, // if negative, this is a composite glyph | ||||
| xMin: r.int16, | ||||
| yMin: r.int16, | ||||
| xMax: r.int16, | ||||
| yMax: r.int16, | ||||
| endPtsOfContours: new r.Array(r.uint16, 'numberOfContours'), | ||||
| instructions: new r.Array(r.uint8, r.uint16), | ||||
| flags: new r.Array(r.uint8, 0), | ||||
| xPoints: new r.Array(Point, 0), | ||||
| yPoints: new r.Array(Point, 0) | ||||
| }); | ||||
| /** | ||||
| * Encodes TrueType glyph outlines | ||||
| */ | ||||
| export default class TTFGlyphEncoder { | ||||
| encodeSimple(path, instructions = []) { | ||||
| let endPtsOfContours = []; | ||||
| let xPoints = []; | ||||
| let yPoints = []; | ||||
| let flags = []; | ||||
| let same = 0; | ||||
| let lastX = 0, lastY = 0, lastFlag = 0; | ||||
| let pointCount = 0; | ||||
| for (let i = 0; i < path.commands.length; i++) { | ||||
| let c = path.commands[i]; | ||||
| for (let j = 0; j < c.args.length; j += 2) { | ||||
| let x = c.args[j]; | ||||
| let y = c.args[j + 1]; | ||||
| let flag = 0; | ||||
| // If the ending point of a quadratic curve is the midpoint | ||||
| // between the control point and the control point of the next | ||||
| // quadratic curve, we can omit the ending point. | ||||
| if (c.command === 'quadraticCurveTo' && j === 2) { | ||||
| let next = path.commands[i + 1]; | ||||
| if (next && next.command === 'quadraticCurveTo') { | ||||
| let midX = (lastX + next.args[0]) / 2; | ||||
| let midY = (lastY + next.args[1]) / 2; | ||||
| if (x === midX && y === midY) { | ||||
| continue; | ||||
| } | ||||
| } | ||||
| } | ||||
| // All points except control points are on curve. | ||||
| if (!(c.command === 'quadraticCurveTo' && j === 0)) { | ||||
| flag |= ON_CURVE; | ||||
| } | ||||
| flag = this._encodePoint(x, lastX, xPoints, flag, X_SHORT_VECTOR, SAME_X); | ||||
| flag = this._encodePoint(y, lastY, yPoints, flag, Y_SHORT_VECTOR, SAME_Y); | ||||
| if (flag === lastFlag && same < 255) { | ||||
| flags[flags.length - 1] |= REPEAT; | ||||
| same++; | ||||
| } else { | ||||
| if (same > 0) { | ||||
| flags.push(same); | ||||
| same = 0; | ||||
| } | ||||
| flags.push(flag); | ||||
| lastFlag = flag; | ||||
| } | ||||
| lastX = x; | ||||
| lastY = y; | ||||
| pointCount++; | ||||
| } | ||||
| if (c.command === 'closePath') { | ||||
| endPtsOfContours.push(pointCount - 1); | ||||
| } | ||||
| } | ||||
| // Close the path if the last command didn't already | ||||
| if (path.commands.length > 1 && path.commands[path.commands.length - 1].command !== 'closePath') { | ||||
| endPtsOfContours.push(pointCount - 1); | ||||
| } | ||||
| let bbox = path.bbox; | ||||
| let glyf = { | ||||
| numberOfContours: endPtsOfContours.length, | ||||
| xMin: bbox.minX, | ||||
| yMin: bbox.minY, | ||||
| xMax: bbox.maxX, | ||||
| yMax: bbox.maxY, | ||||
| endPtsOfContours: endPtsOfContours, | ||||
| instructions: instructions, | ||||
| flags: flags, | ||||
| xPoints: xPoints, | ||||
| yPoints: yPoints | ||||
| }; | ||||
| let size = Glyf.size(glyf); | ||||
| let tail = 4 - (size % 4); | ||||
| let stream = new r.EncodeStream(size + tail); | ||||
| Glyf.encode(stream, glyf); | ||||
| // Align to 4-byte length | ||||
| if (tail !== 0) { | ||||
| stream.fill(0, tail); | ||||
| } | ||||
| return stream.buffer; | ||||
| } | ||||
| _encodePoint(value, last, points, flag, shortFlag, sameFlag) { | ||||
| let diff = value - last; | ||||
| if (value === last) { | ||||
| flag |= sameFlag; | ||||
| } else { | ||||
| if (-255 <= diff && diff <= 255) { | ||||
| flag |= shortFlag; | ||||
| if (diff < 0) { | ||||
| diff = -diff; | ||||
| } else { | ||||
| flag |= sameFlag; | ||||
| } | ||||
| } | ||||
| points.push(diff); | ||||
| } | ||||
| return flag; | ||||
| } | ||||
| } | ||||