38 lines
1.6 KiB
JavaScript
38 lines
1.6 KiB
JavaScript
const _ = require('lodash');
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const Canvas = require('canvas');
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const { _drawImage } = require('./imageex');
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const logger = require('loglevel');
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logger.setLevel(process.env.LOGLEVEL || 'info');
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const { createCanvas, Image } = Canvas;
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const filters = {
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pride: (canvas, source, x, y, props) => {
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_.each(canvas.frames, frame => {
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const basicProps = { width: props.width, height: props.height };
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const tmpCanvas = createCanvas(frame.canvas.width, frame.canvas.height);
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const tmpCtx = tmpCanvas.getContext('2d');
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_drawImage(tmpCtx, frame.canvas, x, y, basicProps);
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const multiplyProps = _.extend({}, props, { attributes: { globalCompositeOperation: 'multiply' } });
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logger.debug('multiply props:', multiplyProps);
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_drawImage(tmpCtx, source.frames[0].canvas, x, y, multiplyProps);
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const tmpCanvas2 = createCanvas(frame.canvas.width, frame.canvas.height);
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const tmpCtx2 = tmpCanvas2.getContext('2d');
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_drawImage(tmpCtx2, frame.canvas, x, y, basicProps);
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const sourceInProps = _.extend({}, props, { attributes: { globalCompositeOperation: 'source-in' } });
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_drawImage(tmpCtx2, source.frames[0].canvas, x, y, sourceInProps);
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const combineProps2 = _.extend({}, basicProps, { attributes: { globalCompositeOperation: 'source-atop', globalAlpha: 1 } });
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_drawImage(frame.ctx, tmpCanvas2, x, y, combineProps2);
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const combineProps = _.extend({}, basicProps, { attributes: { globalCompositeOperation: 'source-atop', globalAlpha: 0.6 } });
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_drawImage(frame.ctx, tmpCanvas, x, y, combineProps);
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});
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return canvas;
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}
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};
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module.exports = filters;
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