Squashed 'external/libwebp/libwebp/' content from commit dd7364c3c

git-subtree-dir: external/libwebp/libwebp git-subtree-split: dd7364c3cefe0f5c0b3c18c3b1887d353f90fc1f
2023-08-02 14:57:22 +02:00
commit 67653bbe50
331 changed files with 116119 additions and 0 deletions
--- a/webp_js/index_wasm.html
+++ b/webp_js/index_wasm.html
@ -0,0 +1,90 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <title>simple Javascript WebP decoding demo, using Web-Assembly (WASM)</title>
+  <script type="text/javascript">
+    var Module = {
+      noInitialRun : true
+    };
+  </script>
+  <script type="text/javascript">
+
+'use strict';
+
+// main wrapper for the function decoding a WebP into a canvas object
+var WebpToCanvas;
+
+function init() {
+  var xhr = new XMLHttpRequest();
+  xhr.open('GET', 'webp_wasm.wasm', true);
+  xhr.responseType = 'arraybuffer';
+  xhr.onload = function() {
+    Module.wasmBinary = xhr.response;
+    var script = document.createElement('script');
+    script.src = "webp_wasm.js";
+    document.body.appendChild(script);
+  };
+  xhr.send(null);
+}
+window.onload = init;
+
+function decode(webp_data, canvas_id) {
+  var result;
+  if (Module["asm"] != undefined) {
+    // wrapper for the function decoding a WebP into a canvas object
+    WebpToCanvas = Module.cwrap('WebPToSDL', 'number', ['array', 'number']);
+    // get the canvas to decode into
+    var canvas = document.getElementById(canvas_id);
+    if (canvas == null) return;
+    // clear previous picture (if any)
+    Module.canvas = canvas;
+    canvas.getContext('2d').clearRect(0, 0, canvas.width, canvas.height);
+    // decode and measure timing
+    var start = new Date();
+    var ret = WebpToCanvas(webp_data, webp_data.length);
+    var end = new Date();
+    var decode_time = end - start;
+    result = 'decoding time: ' + decode_time +' ms.';
+  } else {
+    result = "WASM module not finished loading! Please retry";
+  }
+  // display timing result
+  var speed_result = document.getElementById('timing');
+  if (speed_result != null) {
+    speed_result.innerHTML = '<p>'+ result + '</p>';
+  }
+}
+
+function loadfile(filename, canvas_id) {
+  var xhr = new XMLHttpRequest();
+  xhr.open('GET', filename);
+  xhr.responseType = 'arraybuffer';
+  xhr.onreadystatechange = function() {
+    if (xhr.readyState == 4 && xhr.status == 200) {
+      var webp_data = new Uint8Array(xhr.response);
+      decode(webp_data, canvas_id);
+    }
+  };
+  xhr.send();
+}
+  </script>
+</head>
+
+<body>
+  <p>
+    <strong>WebP demo using Web-Assembly</strong> -
+  </p>
+  <p>
+    WASM version of the WebP decoder, using libwebp compiled with
+    <a href="https://github.com/kripken/emscripten/wiki">Emscripten</a>.
+  </p>
+  <p id="image_buttons">
+    <input type="button" value="test image!"
+           onclick="loadfile('./test_webp_wasm.webp', 'output_canvas')">
+  </p>
+  <p id="timing">Timing: N/A</p>
+  <canvas id="output_canvas">Your browser does not support canvas</canvas>
+</body>
+</html>