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remove unused resizeNearestNeighbor util

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This commit is contained in:
Julian Descottes 2016-12-24 10:24:23 +01:00
parent 8551a8546a
commit ef8060c07d
1 changed files with 0 additions and 60 deletions
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60
src/js/utils/ImageResizer.js
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@ -20,66 +20,6 @@
context.drawImage(image, -image.width / 2, -image.height / 2);
context.restore();
return canvas;
},
/**
* Manual implementation of resize using a nearest neighbour algorithm
* It is slower than relying on the native 'disabledImageSmoothing' available on CanvasRenderingContext2d.
* But it can be useful if :
* - IE < 11 (doesn't support msDisableImageSmoothing)
* - need to display a gap between pixel
*
* @param {Canvas2d} source original image to be resized, as a 2d canvas
* @param {Number} zoom ratio between desired dim / source dim
* @param {Number} margin gap to be displayed between pixels
* @param {String} color or the margin (will be transparent if not provided)
* @return {Canvas2d} the resized canvas
*/
resizeNearestNeighbour : function (source, zoom, margin, marginColor) {
margin = margin || 0;
var canvas = pskl.utils.CanvasUtils.createCanvas(zoom * source.width, zoom * source.height);
var context = canvas.getContext('2d');
var imgData = pskl.utils.CanvasUtils.getImageDataFromCanvas(source);
var yRanges = {};
var xOffset = 0;
var yOffset = 0;
// Draw the zoomed-up pixels to a different canvas context
for (var x = 0; x < source.width; x++) {
// Calculate X Range
var xRange = Math.floor((x + 1) * zoom) - xOffset;
for (var y = 0; y < source.height; y++) {
// Calculate Y Range
if (!yRanges[y + '']) {
// Cache Y Range
yRanges[y + ''] = Math.floor((y + 1) * zoom) - yOffset;
}
var yRange = yRanges[y + ''];
var i = (y * source.width + x) * 4;
var r = imgData[i];
var g = imgData[i + 1];
var b = imgData[i + 2];
var a = imgData[i + 3];
context.fillStyle = 'rgba(' + r + ',' + g + ',' + b + ',' + (a / 255) + ')';
context.fillRect(xOffset, yOffset, xRange - margin, yRange - margin);
if (margin && marginColor) {
context.fillStyle = marginColor;
context.fillRect(xOffset + xRange - margin, yOffset, margin, yRange);
context.fillRect(xOffset, yOffset + yRange - margin, xRange, margin);
}
yOffset += yRange;
}
yOffset = 0;
xOffset += xRange;
}
return canvas;
}
};