mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-09-21 14:24:19 +00:00
329 lines
7.7 KiB
JavaScript
329 lines
7.7 KiB
JavaScript
var base64_val = [
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255, 62,255,255,255, 63,
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61,255,255,255, 0,255,255,
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255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,255,255,255,255,255,
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255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
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41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,255,255,255,255,255
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]
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function base64_8(str, index) {
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var v =
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(base64_val[str.charCodeAt(index)]) +
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(base64_val[str.charCodeAt(index+1)] << 6);
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return v;
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}
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function base64_16(str, index) {
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var v =
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(base64_val[str.charCodeAt(index)]) +
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(base64_val[str.charCodeAt(index+1)] << 6) +
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(base64_val[str.charCodeAt(index+2)] << 12);
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return v;
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}
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function base64_16s(str, index) {
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var v = base64_16(str, index);
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if (v > 32767)
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return v - 65536;
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else
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return v;
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}
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function base64_24(str, index) {
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var v =
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(base64_val[str.charCodeAt(index)]) +
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(base64_val[str.charCodeAt(index+1)] << 6) +
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(base64_val[str.charCodeAt(index+2)] << 12) +
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(base64_val[str.charCodeAt(index+3)] << 18);
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return v;
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}
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function base64_32(str, index) {
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var v =
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(base64_val[str.charCodeAt(index)]) +
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(base64_val[str.charCodeAt(index+1)] << 6) +
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(base64_val[str.charCodeAt(index+2)] << 12) +
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(base64_val[str.charCodeAt(index+3)] << 18) +
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(base64_val[str.charCodeAt(index+4)] << 24) +
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(base64_val[str.charCodeAt(index+5)] << 30);
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return v;
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}
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function createXHR()
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{
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try { return new XMLHttpRequest(); } catch(e) {}
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try { return new ActiveXObject("Msxml2.XMLHTTP.6.0"); } catch (e) {}
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try { return new ActiveXObject("Msxml2.XMLHTTP.3.0"); } catch (e) {}
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try { return new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) {}
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try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {}
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return null;
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}
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var surfaces = {};
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var outstanding_commands = new Array();
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var input_socket = null;
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function initContext(canvas, x, y, id)
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{
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canvas.surface_id = id;
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canvas.style["position"] = "absolute"
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canvas.style["left"] = x + "px"
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canvas.style["top"] = y + "px"
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canvas.style["display"] = "none"
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context = canvas.getContext("2d")
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context.globalCompositeOperation = "src-over"
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context.fillRect(0, 0, canvas.width, canvas.height);
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document.body.appendChild(canvas)
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return context
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}
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function handleCommands(cmd_obj)
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{
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var cmd = cmd_obj.data;
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var i = cmd_obj.pos;
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while (i < cmd.length) {
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var command = cmd[i++];
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switch (command) {
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/* create new surface */
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case 's':
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var id = base64_16(cmd, i);
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i = i + 3;
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var x = base64_16(cmd, i);
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i = i + 3;
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var y = base64_16(cmd, i);
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i = i + 3;
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var w = base64_16(cmd, i);
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i = i + 3;
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var h = base64_16(cmd, i);
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i = i + 3;
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var surface = document.createElement("canvas");
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surface.width = w;
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surface.height = h;
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surfaces[id] = initContext(surface, x, y, id);
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break;
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/* show a surface */
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case 'S':
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var id = base64_16(cmd, i);
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i = i + 3;
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surfaces[id].canvas.style["display"] = "inline";
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break;
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/* hide a surface */
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case 'H':
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var id = base64_16(cmd, i);
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i = i + 3;
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surfaces[id].canvas.style["display"] = "inline";
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break;
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/* delete surface */
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case 'd':
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var id = base64_16(cmd, i);
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i = i + 3;
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var canvas = surfaces[id].canvas
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delete surfaces[id]
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canvas.parentNode.removeChild(canvas);
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break;
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/* move a surface */
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case 'm':
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var id = base64_16(cmd, i);
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i = i + 3;
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var x = base64_16(cmd, i);
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i = i + 3;
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var y = base64_16(cmd, i);
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i = i + 3;
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surfaces[id].canvas.style["left"] = x + "px";
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surfaces[id].canvas.style["top"] = y + "px";
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break;
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/* resize a surface */
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case 'r':
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var id = base64_16(cmd, i);
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i = i + 3;
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var w = base64_16(cmd, i);
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i = i + 3;
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var h = base64_16(cmd, i);
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i = i + 3;
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surfaces[id].canvas.width = w;
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surfaces[id].canvas.height = h;
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break;
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/* put image data surface */
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case 'i':
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var id = base64_16(cmd, i);
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i = i + 3;
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var x = base64_16(cmd, i);
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i = i + 3;
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var y = base64_16(cmd, i);
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i = i + 3;
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var size = base64_32(cmd, i);
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i = i + 6;
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var url = cmd.slice(i, i + size);
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i = i + size;
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var img = new Image();
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img.src = url
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if (img.complete) {
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surfaces[id].drawImage(img, x, y);
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} else {
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cmd_obj.pos = i;
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img.onload = function() { surfaces[id].drawImage(img, x, y); handleOutstanding(); }
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return false
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}
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break;
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/* copy rects */
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case 'b':
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var id = base64_16(cmd, i);
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i = i + 3;
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var nrects = base64_16(cmd, i);
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i = i + 3;
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var context = surfaces[id];
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context.save();
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var minx;
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var miny;
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var maxx;
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var maxy;
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for (var r = 0; r < nrects; r++) {
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var x = base64_16(cmd, i);
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i = i + 3;
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var y = base64_16(cmd, i);
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i = i + 3;
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var w = base64_16(cmd, i);
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i = i + 3;
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var h = base64_16(cmd, i);
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i = i + 3;
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context.rect(x, y, w, h);
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if (r == 0) {
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minx = x;
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miny = y;
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maxx = x + w;
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maxy = y + h;
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} else {
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if (x < minx)
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minx = x;
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if (y < miny)
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miny = y;
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if (x + w > maxx)
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maxx = x + w;
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if (y + h > maxy)
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maxy = y + h;
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}
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}
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context.clip()
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var dx = base64_16s(cmd, i);
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i = i + 3;
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var dy = base64_16s(cmd, i);
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i = i + 3;
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context.drawImage(context.canvas,
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minx - dx, miny - dy, maxx - minx, maxy - miny,
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minx, miny, maxx - minx, maxy - miny);
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context.restore();
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break;
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default:
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alert("Unknown op " + command);
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}
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}
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return true;
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}
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function handleOutstanding()
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{
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while (outstanding_commands.length > 0) {
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var cmd = outstanding_commands.shift();
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if (!handleCommands(cmd)) {
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outstanding_commands.unshift(cmd);
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return;
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}
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}
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}
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function handleLoad(event)
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{
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var cmd_obj = {};
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cmd_obj.data = event.target.responseText;
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cmd_obj.pos = 0;
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outstanding_commands.push(cmd_obj);
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if (outstanding_commands.length == 1) {
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handleOutstanding()
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}
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if ("WebSocket" in window) {
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var loc = window.location.toString().replace("http:", "ws:");
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loc = loc.substr(0, loc.lastIndexOf('/')) + "/input";
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var ws = new WebSocket(loc, "broadway");
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ws.onopen = function() {
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input_socket = ws;
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};
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ws.onclose = function() {
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input_socket = null;
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};
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} else {
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alert("WebSocket not supported, input will not work!");
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}
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}
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function get_surface_id(ev) {
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var id = ev.target.surface_id;
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if (id != undefined)
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return id;
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return 0;
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}
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function send_input(cmd, args)
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{
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if (input_socket != null) {
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input_socket.send(cmd + args.join(","));
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}
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}
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function on_mouse_move (ev) {
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send_input ("m", [get_surface_id(ev), ev.pageX, ev.pageY, ev.timeStamp])
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}
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function on_mouse_down (ev) {
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send_input ("b", [get_surface_id(ev), ev.pageX, ev.pageY, ev.button, ev.timeStamp])
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}
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function on_mouse_up (ev) {
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send_input ("B", [get_surface_id(ev), ev.pageX, ev.pageY, ev.button, ev.timeStamp])
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}
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function connect()
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{
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var xhr = createXHR();
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if (xhr) {
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if (typeof xhr.multipart == 'undefined') {
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alert("Sorry, this example only works in browsers that support multipart.");
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return;
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}
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xhr.multipart = true;
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xhr.open("GET", "/output", true);
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xhr.onload = handleLoad;
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xhr.send(null);
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}
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document.onmousemove = on_mouse_move;
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document.onmousedown = on_mouse_down;
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document.onmouseup = on_mouse_up;
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}
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