86 lines
3.5 KiB
JavaScript
86 lines
3.5 KiB
JavaScript
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function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
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import { throwError, isNodePattern } from '@jimp/utils';
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export default (function () {
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return {
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/**
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* Blits a source image on to this image
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* @param {Jimp} src the source Jimp instance
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* @param {number} x the x position to blit the image
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* @param {number} y the y position to blit the image
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* @param {number} srcx (optional) the x position from which to crop the source image
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* @param {number} srcy (optional) the y position from which to crop the source image
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* @param {number} srcw (optional) the width to which to crop the source image
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* @param {number} srch (optional) the height to which to crop the source image
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* @param {function(Error, Jimp)} cb (optional) a callback for when complete
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* @returns {Jimp} this for chaining of methods
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*/
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blit: function blit(src, x, y, srcx, srcy, srcw, srch, cb) {
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if (!(src instanceof this.constructor)) {
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return throwError.call(this, 'The source must be a Jimp image', cb);
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}
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if (typeof x !== 'number' || typeof y !== 'number') {
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return throwError.call(this, 'x and y must be numbers', cb);
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}
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if (typeof srcx === 'function') {
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cb = srcx;
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srcx = 0;
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srcy = 0;
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srcw = src.bitmap.width;
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srch = src.bitmap.height;
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} else if (_typeof(srcx) === _typeof(srcy) && _typeof(srcy) === _typeof(srcw) && _typeof(srcw) === _typeof(srch)) {
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srcx = srcx || 0;
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srcy = srcy || 0;
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srcw = srcw || src.bitmap.width;
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srch = srch || src.bitmap.height;
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} else {
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return throwError.call(this, 'srcx, srcy, srcw, srch must be numbers', cb);
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} // round input
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x = Math.round(x);
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y = Math.round(y); // round input
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srcx = Math.round(srcx);
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srcy = Math.round(srcy);
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srcw = Math.round(srcw);
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srch = Math.round(srch);
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var maxWidth = this.bitmap.width;
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var maxHeight = this.bitmap.height;
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var baseImage = this;
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src.scanQuiet(srcx, srcy, srcw, srch, function (sx, sy, idx) {
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var xOffset = x + sx - srcx;
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var yOffset = y + sy - srcy;
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if (xOffset >= 0 && yOffset >= 0 && maxWidth - xOffset > 0 && maxHeight - yOffset > 0) {
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var dstIdx = baseImage.getPixelIndex(xOffset, yOffset);
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var _src = {
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r: this.bitmap.data[idx],
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g: this.bitmap.data[idx + 1],
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b: this.bitmap.data[idx + 2],
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a: this.bitmap.data[idx + 3]
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};
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var dst = {
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r: baseImage.bitmap.data[dstIdx],
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g: baseImage.bitmap.data[dstIdx + 1],
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b: baseImage.bitmap.data[dstIdx + 2],
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a: baseImage.bitmap.data[dstIdx + 3]
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};
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baseImage.bitmap.data[dstIdx] = (_src.a * (_src.r - dst.r) - dst.r + 255 >> 8) + dst.r;
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baseImage.bitmap.data[dstIdx + 1] = (_src.a * (_src.g - dst.g) - dst.g + 255 >> 8) + dst.g;
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baseImage.bitmap.data[dstIdx + 2] = (_src.a * (_src.b - dst.b) - dst.b + 255 >> 8) + dst.b;
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baseImage.bitmap.data[dstIdx + 3] = this.constructor.limit255(dst.a + _src.a);
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}
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});
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if (isNodePattern(cb)) {
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cb.call(this, null, this);
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}
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return this;
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}
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};
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});
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//# sourceMappingURL=index.js.map
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