Created
April 30, 2022 19:53
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Get a map of pixel and their corresponding colors in Javascript so in other words a palette and a list of the color index (to be used with my other gist and something like RGBQuant.js)
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| _get_pixels_palette_and_list_from_image_data = (image_data) => { | |
| const image_data_data = image_data.data; | |
| let new_pxl_colors = []; | |
| let new_pxl_colors_set = new Set(); | |
| let new_pxls = new Array(image_data.width * image_data.height); | |
| for (let i = 0; i < image_data_data.length; i += 4) { | |
| const color_hex = this._get_hex_color_from_rgba_values(image_data_data[index], image_data_data[index+1], image_data_data[index+2], image_data_data[index+3]); | |
| const deja_vu_color_hex = new_pxl_colors_set.has(color_hex); | |
| let color_hex_index = deja_vu_color_hex ? new_pxl_colors.indexOf(color_hex): -1; | |
| if (color_hex_index === -1) { | |
| color_hex_index = new_pxl_colors.push(color_hex)-1; | |
| new_pxl_colors_set.add(color_hex); | |
| } | |
| new_pxls[i / 4] = color_hex_index; | |
| } | |
| return [ | |
| new_pxl_colors, | |
| new_pxls, | |
| ]; | |
| } |
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