pixel-editor/js/_loadPalette.js

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JavaScript
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//this is called when a user picks a file after selecting "load palette" from the new pixel dialogue
// TODO: load palette from .lpe file
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document.getElementById('load-palette-browse-holder').addEventListener('change', function () {
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if (this.files && this.files[0]) {
//make sure file is allowed filetype
var fileContentType = this.files[0].type;
if (fileContentType == 'image/png' || fileContentType == 'image/gif') {
//load file
var fileReader = new FileReader();
fileReader.onload = function(e) {
var img = new Image();
img.onload = function() {
//draw image onto the temporary canvas
var loadPaletteCanvas = document.getElementById('load-palette-canvas-holder');
var loadPaletteContext = loadPaletteCanvas.getContext('2d');
loadPaletteCanvas.width = img.width;
loadPaletteCanvas.height = img.height;
loadPaletteContext.drawImage(img, 0, 0);
//create array to hold found colors
var colorPalette = [];
var imagePixelData = loadPaletteContext.getImageData(0,0,this.width, this.height).data;
//loop through pixels looking for colors to add to palette
for (var i = 0; i < imagePixelData.length; i += 4) {
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const newColor = {r:imagePixelData[i],g:imagePixelData[i + 1],b:imagePixelData[i + 2]};
var color = '#' + Color.rgbToHex(newColor);
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if (colorPalette.indexOf(color) == -1) {
colorPalette.push(color);
}
}
//add to palettes so that it can be loaded when they click okay
palettes['Loaded palette'] = {};
palettes['Loaded palette'].colors = colorPalette;
Util.setText('palette-button', 'Loaded palette');
Util.setText('palette-button-splash', 'Loaded palette');
toggle('palette-menu-splash');
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};
img.src = e.target.result;
};
fileReader.readAsDataURL(this.files[0]);
}
else alert('Only PNG and GIF files are supported at this time.');
}
});