thedesk/app/node_modules/@jimp/plugin-rotate/es/index.js
2019-09-12 23:38:13 +09:00

148 lines
4.9 KiB
JavaScript

import { throwError, isNodePattern } from '@jimp/utils';
function rotate90degrees(bitmap, dstBuffer, clockwise) {
var dstOffsetStep = clockwise ? -4 : 4;
var dstOffset = clockwise ? dstBuffer.length - 4 : 0;
var tmp;
var x;
var y;
var srcOffset;
for (x = 0; x < bitmap.width; x++) {
for (y = bitmap.height - 1; y >= 0; y--) {
srcOffset = bitmap.width * y + x << 2;
tmp = bitmap.data.readUInt32BE(srcOffset, true);
dstBuffer.writeUInt32BE(tmp, dstOffset, true);
dstOffset += dstOffsetStep;
}
}
}
/**
* Rotates an image clockwise by an arbitrary number of degrees. NB: 'this' must be a Jimp object.
* @param {number} deg the number of degrees to rotate the image by
* @param {string|boolean} mode (optional) resize mode or a boolean, if false then the width and height of the image will not be changed
*/
function advancedRotate(deg, mode) {
deg %= 360;
var rad = deg * Math.PI / 180;
var cosine = Math.cos(rad);
var sine = Math.sin(rad); // the final width and height will change if resize == true
var w = this.bitmap.width;
var h = this.bitmap.height;
if (mode === true || typeof mode === 'string') {
// resize the image to it maximum dimension and blit the existing image
// onto the center so that when it is rotated the image is kept in bounds
// http://stackoverflow.com/questions/3231176/how-to-get-size-of-a-rotated-rectangle
// Plus 1 border pixel to ensure to show all rotated result for some cases.
w = Math.ceil(Math.abs(this.bitmap.width * cosine) + Math.abs(this.bitmap.height * sine)) + 1;
h = Math.ceil(Math.abs(this.bitmap.width * sine) + Math.abs(this.bitmap.height * cosine)) + 1; // Ensure destination to have even size to a better result.
if (w % 2 !== 0) {
w++;
}
if (h % 2 !== 0) {
h++;
}
var c = this.cloneQuiet();
this.scanQuiet(0, 0, this.bitmap.width, this.bitmap.height, function (x, y, idx) {
this.bitmap.data.writeUInt32BE(this._background, idx);
});
var max = Math.max(w, h, this.bitmap.width, this.bitmap.height);
this.resize(max, max, mode);
this.blit(c, this.bitmap.width / 2 - c.bitmap.width / 2, this.bitmap.height / 2 - c.bitmap.height / 2);
}
var bW = this.bitmap.width;
var bH = this.bitmap.height;
var dstBuffer = Buffer.alloc(this.bitmap.data.length);
function createTranslationFunction(deltaX, deltaY) {
return function (x, y) {
return {
x: x + deltaX,
y: y + deltaY
};
};
}
var translate2Cartesian = createTranslationFunction(-(bW / 2), -(bH / 2));
var translate2Screen = createTranslationFunction(bW / 2 + 0.5, bH / 2 + 0.5);
for (var y = 1; y <= bH; y++) {
for (var x = 1; x <= bW; x++) {
var cartesian = translate2Cartesian(x, y);
var source = translate2Screen(cosine * cartesian.x - sine * cartesian.y, cosine * cartesian.y + sine * cartesian.x);
var dstIdx = bW * (y - 1) + x - 1 << 2;
if (source.x >= 0 && source.x < bW && source.y >= 0 && source.y < bH) {
var srcIdx = (bW * (source.y | 0) + source.x | 0) << 2;
var pixelRGBA = this.bitmap.data.readUInt32BE(srcIdx);
dstBuffer.writeUInt32BE(pixelRGBA, dstIdx);
} else {
// reset off-image pixels
dstBuffer.writeUInt32BE(this._background, dstIdx);
}
}
}
this.bitmap.data = dstBuffer;
if (mode === true || typeof mode === 'string') {
// now crop the image to the final size
var _x = bW / 2 - w / 2;
var _y = bH / 2 - h / 2;
this.crop(_x, _y, w, h);
}
}
export default (function () {
return {
/**
* Rotates the image clockwise by a number of degrees. By default the width and height of the image will be resized appropriately.
* @param {number} deg the number of degrees to rotate the image by
* @param {string|boolean} mode (optional) resize mode or a boolean, if false then the width and height of the image will not be changed
* @param {function(Error, Jimp)} cb (optional) a callback for when complete
* @returns {Jimp} this for chaining of methods
*/
rotate: function rotate(deg, mode, cb) {
// enable overloading
if (typeof mode === 'undefined' || mode === null) {
// e.g. image.resize(120);
// e.g. image.resize(120, null, cb);
// e.g. image.resize(120, undefined, cb);
mode = true;
}
if (typeof mode === 'function' && typeof cb === 'undefined') {
// e.g. image.resize(120, cb);
cb = mode;
mode = true;
}
if (typeof deg !== 'number') {
return throwError.call(this, 'deg must be a number', cb);
}
if (typeof mode !== 'boolean' && typeof mode !== 'string') {
return throwError.call(this, 'mode must be a boolean or a string', cb);
}
advancedRotate.call(this, deg, mode, cb);
if (isNodePattern(cb)) {
cb.call(this, null, this);
}
return this;
}
};
});
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