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index.js
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index.js
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/* External JavaScript Imports */
import $ from "jquery";
/* JavaScript Imports */
import "./template/bootstrap.min.js";
import { load_wasm_module, native_support } from "./modules";
import { AsmjsModule } from "./modules";
import { WasmModule } from "./modules";
import { ImageMemory } from "./image_memory";
import { JsKmeansPainter } from "./js_kmeans_painter";
import { AsmjsKmeansPainter } from "./asmjs_kmeans_painter";
import { WasmKmeansPainter } from "./wasm_kmeans_painter";
/* CSS Imports */
import "./template/bootstrap.css";
import "./template/landing-page.css";
import "./template/font-awesome/css/font-awesome.min.css";
import "./style.css";
/* Image Imports */
import default_image_filepath from "../../img/default.jpg";
let STOP = false;
const image2image_data = (image) => {
const temp_canvas = document.createElement("canvas");
const temp_canvas_context = temp_canvas.getContext("2d");
temp_canvas.width = image.width;
temp_canvas.height = image.height;
temp_canvas_context.drawImage(image, 0, 0);
return temp_canvas_context.getImageData(0, 0, image.width, image.height);
};
const filepath2image_data = (filepath) => (
new Promise((resolve, reject) => {
const image = new Image();
image.onload = () => resolve(image2image_data(image));
image.onabort = (event) => reject(event);
image.onerror = (event) => reject(event);
image.src = filepath;
})
);
const file2image_data = (file) => (
new Promise((resolve, reject) => {
const reader = new FileReader();
const image = new Image();
reader.onload = (event) => {
image.onload = () => resolve(image2image_data(image));
image.src = event.target.result;
};
reader.onabort = (event) => reject(event);
reader.onerror = (event) => reject(event);
reader.readAsDataURL(file);
})
);
const draw_image_data = (image_data, canvas) => {
const canvas_context = canvas.getContext("2d");
const temp_canvas = document.createElement("canvas");
const temp_canvas_context = temp_canvas.getContext("2d");
temp_canvas.width = image_data.width;
temp_canvas.height = image_data.height;
temp_canvas_context.putImageData(image_data, 0, 0);
canvas.width = window.innerWidth;
canvas.height = (temp_canvas.height / temp_canvas.width) * canvas.width;
canvas_context.drawImage(temp_canvas, 0, 0, temp_canvas.width, temp_canvas.height,
0, 0, canvas.width, canvas.height);
};
const add_stats = (painter, image_data, times) => {
times.sort();
const length = times.length;
let total = times.reduce((acc, val) => acc + val, 0);
const average = total / length;
const half = Math.floor(length / 2);
let median;
if (length % 2) { median = times[half]; }
else { median = (times[half - 1] + times[half]) / 2.0; }
const min = times[0];
const max = times[length - 1];
if ($("#results_table tbody tr").first().hasClass("no-results-row")) {
$("#results_table tr:last").remove();
}
$("#results_table").prepend(
"<tr>" +
` <td>${painter.get_identifier()}</td>` +
` <td>${painter.get_k()}</td>` +
` <td>${length}</td>` +
` <td>${image_data.width}x${image_data.height}</td>` +
` <td> ${Math.round(total)}</td>` +
` <td> ${Math.round(average)}</td>` +
` <td> ${Math.round(median)}</td>` +
` <td> ${Math.round(min)}</td>` +
` <td> ${Math.round(max)}</td>` +
"</tr>"
);
};
const paint_canvas = (painter, steps, image_memory, canvas, times = []) => {
if (steps > 0 && !STOP) {
$("#spinner").show();
setTimeout(() => {
const start = performance.now();
painter.step(1);
const end = performance.now();
times.push(end - start);
draw_image_data(image_memory.get_image_data(), canvas);
paint_canvas(painter, steps - 1, image_memory, canvas, times);
}, 20);
} else {
$("#spinner").hide();
STOP = false;
add_stats(painter, image_memory.get_image_data(), times);
painter.free();
}
};
const get_val = (element) => (
(element.val() && parseInt(element.val())) > 0 ? parseInt(element.val()) : 1
);
$(document).ready(() => {
const file_upload = $("#file_upload");
const reset_button = $("#reset_button");
const k_range = $("#k_range");
const steps_range = $("#steps_range");
const javascript_button = $("#javascript_button");
const asmjs_button = $("#asmjs_button");
const wasm_button = $("#wasm_button");
const canvas = document.getElementById("image_canvas");
/* Setup the numeric-input elements. */
$(".numeric-input").each((_, numeric_input) => {
const input = $(numeric_input).find("input");
/* Only allow numbers. */
input.keydown((event) => {
return (event.ctrlKey || event.altKey
|| (47 < event.keyCode && event.keyCode < 58 && event.shiftKey == false)
|| (95 < event.keyCode && event.keyCode < 106)
|| (event.keyCode == 8) || (event.keyCode == 9)
|| (event.keyCode > 34 && event.keyCode < 40)
|| (event.keyCode == 46));
});
const buttons = $(numeric_input).find("button");
const increase = $(buttons[0]);
const decrease = $(buttons[1]);
increase.click(() => input.val(get_val(input) + 1));
decrease.click(() => {
if (get_val(input) > 1) {
input.val(get_val(input) - 1);
}
});
});
/* Set event handler for custom file upload. */
$("#file_upload_button").click(() => file_upload.click());
/* Set event handler for stop button. */
$("#stop_button").click(() => STOP = true);
/* Remove focus from button after being pressed. Use function to access 'this'. */
$(".btn").mouseup(function () { $(this).blur(); });
/* Load the default image. */
load_wasm_module().then(() => {
if (!native_support()) {
$("#web_assembly_support").show();
wasm_button.prop("disabled", true);
}
return filepath2image_data(default_image_filepath);
}).then((default_image_data) => {
let asmjs_image_memory = null;
let wasm_image_memory = null;
const new_image = (new_image_data) => {
javascript_button.prop("disabled", false);
asmjs_button.prop("disabled", false);
if (asmjs_image_memory) { asmjs_image_memory.free(); }
asmjs_image_memory = new ImageMemory(new_image_data, AsmjsModule);
if (native_support()) {
if (wasm_image_memory) { wasm_image_memory.free(); }
wasm_button.prop("disabled", false);
wasm_image_memory = new ImageMemory(new_image_data, WasmModule);
}
draw_image_data(asmjs_image_memory.get_image_data(), canvas);
};
/* Set event handler for reset button. */
reset_button.click(() => {
if (native_support()) { wasm_image_memory.reset(); }
new_image(asmjs_image_memory.reset(), canvas);
});
const paint = (painter_class) => {
STOP = false;
javascript_button.prop("disabled", true);
asmjs_button.prop("disabled", true);
wasm_button.prop("disabled", true);
let image_memory = asmjs_image_memory;
if (painter_class === WasmKmeansPainter) {
image_memory = wasm_image_memory;
}
const painter = new painter_class(get_val(k_range), image_memory);
paint_canvas(painter, get_val(steps_range), image_memory, canvas);
};
file_upload.change((event) => {
if (!event.originalEvent) { /* The default image case. */
new_image(default_image_data);
} else if (event.target.files.length > 0) { /* New file selected case. */
const file = event.target.files[0];
file2image_data(file).then((image_data) => new_image(image_data));
} else { return; } /* No new file selected case. */
javascript_button.off(); asmjs_button.off(); wasm_button.off();
javascript_button.click(() => paint(JsKmeansPainter));
asmjs_button.click(() => paint(AsmjsKmeansPainter));
wasm_button.click(() => paint(WasmKmeansPainter));
});
/* Trigger a change to load the default image. */
/* TODO: For some reason there is a bug where the WebAssembly module _malloc call hangs
if we do not wait a little bit. I assume this is because the module is somehow not fully
initialized put a delay here to try and avoid that. I have only noticed this problem in
Firefox. */
setTimeout(() => file_upload.change(), 500);
});
});