git.sesse.net Git - pr0n/blob - files/pr0n-fullscreen.js

   1 var req;
   2
   3 function init_ajax()
   4 {
   5         req = new XMLHttpRequest();
   6 }
   7
   8 function find_width()
   9 {
  10         var dpr = find_dpr();
  11         return [window.innerWidth * dpr, window.innerHeight * dpr];
  12 }
  13
  14 function find_dpr()
  15 {
  16         return window.devicePixelRatio || 1;
  17 }
  18
  19 /*
  20  * pr0n can resize to any size we'd like, but we're much more likely
  21  * to have this set of fixed-resolution screens cached, so to increase
  22  * performance, we round down to the closest fit and use that. This
  23  * function is a pessimal estimate of what thumbnail size we can _always_
  24  * fit on the screen -- it's right if and only if all images are 4:3
  25  * (and landscape). If individual size information is available, use
  26  * pick_image_size, below.
  27  */
  28 var fixed_sizes = [
  29         [ 2304, 1728 ],
  30         [ 2048, 1536 ],
  31         [ 1920, 1440 ],
  32         [ 1600, 1200 ],
  33         [ 1400, 1050 ],
  34         [ 1280, 960 ],
  35         [ 1152, 864 ],
  36         [ 1024, 768 ],
  37         [ 800, 600 ],
  38         [ 640, 480 ],
  39         [ 512, 384 ],
  40         [ 320, 256 ],
  41         [ 240, 192 ],
  42         [ 120, 96 ],
  43         [ 80, 64 ]
  44 ];
  45 function max_image_size(screen_size)
  46 {
  47         var i;
  48         for (i = 0; i < fixed_sizes.length; ++i) {
  49                 if (screen_size[0] >= fixed_sizes[i][0] && screen_size[1] >= fixed_sizes[i][1]) {
  50                         return fixed_sizes[i];
  51                 }
  52         }
  53         return [ 80, 64 ];
  54 }
  55
  56 function pick_image_size(screen_size, image_size)
  57 {
  58         var i;
  59         for (i = 0; i < fixed_sizes.length; ++i) {
  60                 // this is a duplicate of pr0n's resizing code, hope for no floating-point
  61                 // inaccuracies :-)
  62                 var thumbxres = fixed_sizes[i][0];
  63                 var thumbyres = fixed_sizes[i][1];
  64                 var width = image_size[0];
  65                 var height = image_size[1];
  66
  67                 if (!(thumbxres >= width && thumbyres >= height)) {
  68                         var sfh = width / thumbxres;
  69                         var sfv = height / thumbyres;
  70                         if (sfh > sfv) {
  71                                 width  /= sfh;
  72                                 height /= sfh;
  73                         } else {
  74                                 width  /= sfv;
  75                                 height /= sfv;
  76                         }
  77                         width = Math.floor(width);
  78                         height = Math.floor(height);
  79                 }
  80
  81                 if (screen_size[0] >= width && screen_size[1] >= height) {
  82                         // be sure _not_ to return a reference
  83                         return [ fixed_sizes[i][0], fixed_sizes[i][1], width, height ];
  84                 }
  85         }
  86         return [ 80, 64 ];
  87 }
  88
  89 function replace_image_element(url, element_id, parent_node)
  90 {
  91         var img = document.getElementById(element_id);
  92         if (img !== null) {
  93                 if (img.src === url) {
  94                         return img;
  95                 }
  96                 img.parentNode.removeChild(img);
  97         }
  98
  99         img = document.createElement("img");
 100         img.id = element_id;
 101         img.alt = "";
 102         img.src = url;
 103         parent_node.appendChild(img);
 104         return img;
 105 }
 106
 107 function rename_element(old_name, new_name)
 108 {
 109         // Remove any element that's in the way.
 110         var elem = document.getElementById(new_name);
 111         if (elem !== null) {
 112                 elem.parentNode.removeChild(elem);
 113         }
 114
 115         elem = document.getElementById(old_name);
 116         if (elem !== null) {
 117                 elem.id = new_name;
 118         }
 119         return elem;
 120 }
 121
 122 function display_image(width, height, evt, filename, element_id)
 123 {
 124         var url = window.location.origin + "/" + evt + "/" + width + "x" + height + "/" + filename;
 125         var main = document.getElementById("iehack");
 126         var preload = document.getElementById("preload");
 127         var dpr = find_dpr();
 128         var img;
 129         // See if we have a preload going on that we can reuse.
 130         if (element_id == "image" && preload !== null && preload.src == url) {
 131                 rename_element("preload_box", "image_box");
 132                 img = rename_element("preload", "image");
 133         } else {
 134                 img = replace_image_element(url, element_id, main);
 135         }
 136         img.style.position = "absolute";
 137         img.style.left = "0px";
 138         img.style.top = "0px";
 139         img.style.transformOrigin = "top left";
 140         img.style.transform = "scale(" + (1.0 / dpr) + ")";
 141
 142         // Update the "download original" link.
 143         var original_url = window.location.origin + "/" + evt + "/original/" + filename;
 144         document.getElementById("origdownload").href = original_url;
 145
 146         if (global_infobox) {
 147                 var url;
 148                 if (dpr == 1) {
 149                         url = window.location.origin + "/" + evt + "/" + width + "x" + height + "/box/" + filename;
 150                 } else {
 151                         url = window.location.origin + "/" + evt + "/" + width + "x" + height + "@" + dpr.toFixed(2) + "/box/" + filename;
 152                 }
 153                 var boximg = replace_image_element(url, element_id + "_box", main);
 154
 155                 boximg.style.position = "absolute";
 156                 boximg.style.left = "0px";
 157                 boximg.style.bottom = "-1px";
 158                 boximg.style.transformOrigin = "bottom left";
 159                 boximg.style.transform = "scale(" + (1.0 / dpr) + ")";
 160         } else {
 161                 var boximg = document.getElementById(element_id + "_box");
 162                 if (boximg !== null) {
 163                         boximg.parentNode.removeChild(boximg);
 164                 }
 165         }
 166
 167         return img;
 168 }
 169
 170 function display_image_num(num, element_id)
 171 {
 172         var screen_size = find_width();
 173         var adjusted_size;
 174
 175         if (global_image_list[num][2] == -1) {
 176                 // no size information, use our pessimal guess
 177                 adjusted_size = max_image_size(screen_size);
 178         } else {
 179                 adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 180         }
 181
 182         var img = display_image(adjusted_size[0], adjusted_size[1], global_image_list[num][0], global_image_list[num][1], element_id);
 183
 184         if (element_id == "image") {
 185                 // we want to shrink the box as much as possible if we know the true
 186                 // size of the image
 187                 center_image(num);
 188
 189                 // replace the anchor part (if any) with the image number
 190                 window.location.hash = "#" + (num+1);
 191         }
 192
 193         return img;
 194 }
 195
 196 function prepare_preload(img, num)
 197 {
 198         // cancel any pending preload
 199         var preload = document.getElementById("preload");
 200         if (preload !== null) {
 201                 preload.parentNode.removeChild(preload);
 202         }
 203
 204         var preload_box = document.getElementById("preload_box");
 205         if (preload_box !== null) {
 206                 preload_box.parentNode.removeChild(preload_box);
 207         }
 208
 209         // grmf -- IE doesn't fire onload if the image was loaded from cache, so check for
 210         // completeness first; should at least be _somewhat_ better
 211         if (img.complete) {
 212                 display_image_num(num, "preload");
 213         } else {
 214                 img.onload = function() { display_image_num(num, "preload"); };
 215         }
 216 }
 217
 218 function can_go_next()
 219 {
 220         return (global_image_num < global_image_list.length - 1);
 221 }
 222
 223 function can_go_previous()
 224 {
 225         return (global_image_num > 0);
 226 }
 227
 228 function set_opacity(id, amount)
 229 {
 230         var elem = document.getElementById(id);
 231
 232         // If optionmenu is visible, options is also visible.
 233         if (id === "options" && amount < 0.7) {
 234                 var optionmenu = document.getElementById("optionmenu");
 235                 if (optionmenu.style.display === "block") {
 236                         amount = 0.7;
 237                 }
 238         }
 239         elem.style.opacity = amount;
 240 }
 241
 242 function center_image(num)
 243 {
 244         var screen_size = find_width();
 245         var dpr = find_dpr();
 246         var width, height;
 247
 248         if (global_image_list[num][2] == -1) {
 249                 // no size information, use our pessimal guess
 250                 var adjusted_size = max_image_size(screen_size);
 251                 width = adjusted_size[0];
 252                 height = adjusted_size[1];
 253         } else {
 254                 // use the exact information
 255                 var adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
 256                 width = adjusted_size[2];
 257                 height = adjusted_size[3];
 258         }
 259
 260         // center the image on-screen
 261         var main = document.getElementById("main");
 262         main.style.position = "absolute";
 263         main.style.left = (((screen_size[0] - width) / 2) / dpr) + "px";
 264         main.style.top = (((screen_size[1] - height) / 2) / dpr) + "px";
 265         main.style.width = (width / dpr) + "px";
 266         main.style.height = (height / dpr) + "px";
 267         main.style.lineHeight = (height / dpr) + "px";
 268 }
 269
 270 function relayout()
 271 {
 272         var img = display_image_num(global_image_num, "image");
 273         if (can_go_next()) {
 274                 prepare_preload(img, global_image_num + 1);
 275         }
 276
 277         set_opacity("previous", can_go_previous() ? global_default_opacity : 0.1);
 278         set_opacity("next", can_go_next() ? global_default_opacity : 0.1);
 279         set_opacity("close", global_default_opacity);
 280         set_opacity("options", global_default_opacity);
 281 }
 282
 283 function go_previous()
 284 {
 285         if (!can_go_previous()) {
 286                 return;
 287         }
 288
 289         var img = display_image_num(--global_image_num, "image");
 290         if (can_go_previous()) {
 291                 set_opacity("previous", global_default_opacity);
 292                 prepare_preload(img, global_image_num - 1);
 293         } else {
 294                 set_opacity("previous", 0.1);
 295         }
 296         set_opacity("next", can_go_next() ? global_default_opacity : 0.1);
 297 }
 298
 299 function go_next()
 300 {
 301         if (!can_go_next()) {
 302                 return;
 303         }
 304
 305         var img = display_image_num(++global_image_num, "image");
 306         if (can_go_next()) {
 307                 set_opacity("next", global_default_opacity);
 308                 prepare_preload(img, global_image_num + 1);
 309         } else {
 310                 set_opacity("next", 0.1);
 311         }
 312         set_opacity("previous", can_go_previous() ? global_default_opacity : 0.1);
 313 }
 314
 315 function do_close()
 316 {
 317         window.location = global_return_url;
 318 }
 319
 320 function toggle_optionmenu()
 321 {
 322         var optionmenu = document.getElementById("optionmenu");
 323         if (optionmenu.style.display === "block") {
 324                 optionmenu.style.display = "none";
 325         } else {
 326                 optionmenu.style.display = "block";
 327                 set_opacity("options", 0.7);
 328         }
 329 }
 330
 331 function draw_text(msg)
 332 {
 333         // remove any text we might have left
 334         var text = document.getElementById("text");
 335         if (text !== null) {
 336                 text.parentNode.removeChild(text);
 337         }
 338
 339         text = document.createElement("p");
 340         text.id = "text";
 341         text.style.position = "absolute";
 342         text.style.color = "white";
 343         text.style.lineHeight = "24px";
 344         text.style.font = "24px verdana, arial, sans-serif";
 345         text.innerHTML = msg;
 346
 347         var main = document.getElementById("main");
 348         main.appendChild(text);
 349
 350         text.style.left = (main.clientWidth - text.clientWidth) / 2 + "px";
 351         text.style.top = (main.clientHeight - text.clientHeight) / 2 + "px";
 352 }
 353
 354 function fade_text(opacity)
 355 {
 356         set_opacity("text", opacity);
 357         if (opacity > 0.0) {
 358                 opacity -= 0.03;
 359                 if (opacity < 0.0) {
 360                         opacity = 0.0;
 361                 }
 362                 setTimeout("fade_text(" + opacity + ")", 30);
 363         } else {
 364                 var text = document.getElementById("text");
 365                 if (text !== null) {
 366                         text.parentNode.removeChild(text);
 367                 }
 368         }
 369 }
 370
 371 function select_image(evt, filename, selected)
 372 {
 373         if (!req) {
 374                 return;
 375         }
 376
 377         if (selected) {
 378                 draw_text("Selecting " + filename + "...");
 379         } else {
 380                 draw_text("Unselecting " + filename + "...");
 381         }
 382
 383         req.open("POST", window.location.origin + "/select", false);
 384         req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
 385         req.send("event=" + evt + "&filename=" + filename + "&selected=" + selected);
 386
 387         setTimeout("fade_text(0.99)", 30);
 388 }
 389
 390 function key_down(which)
 391 {
 392         if (which == 39) {   // right
 393                 if (can_go_next()) {
 394                         set_opacity("next", 0.99);
 395                 }
 396         } else if (which == 37) {   // left
 397                 if (can_go_previous()) {
 398                         set_opacity("previous", 0.99);
 399                 }
 400         } else if (which == 27) {   // escape
 401                 set_opacity("close", 0.99);
 402         } else {
 403                 check_for_hash_change();
 404         }
 405 }
 406
 407 function key_up(which) {
 408         if (which == 39) {   // right
 409                 if (can_go_next()) {
 410                         set_opacity("next", global_default_opacity);
 411                         go_next();
 412                 }
 413         } else if (which == 37) {   // left
 414                 if (can_go_previous()) {
 415                         set_opacity("previous", global_default_opacity);
 416                         go_previous();
 417                 }
 418         } else if (which == 27) {   // escape
 419                 set_opacity("close", global_default_opacity);
 420                 do_close();
 421         } else if (which == 32 && global_select) {   // space
 422                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 1);
 423         } else if (which == 85 && global_select) {   // u
 424                 select_image(global_image_list[global_image_num][0], global_image_list[global_image_num][1], 0);
 425         } else {
 426                 check_for_hash_change();
 427         }
 428 }
 429
 430 function parse_image_num(default_value) {
 431         var num = parseInt(window.location.hash.substr(1));
 432         if (num >= 1 && num <= global_image_list.length) {  // and then num != NaN
 433                 return (num - 1);
 434         } else {
 435                 return default_value;
 436         }
 437 }
 438
 439 function check_for_hash_change() {
 440         var num = parse_image_num(-1);
 441         if (num != -1 && num != global_image_num) {
 442                 global_image_num = num;
 443                 relayout();
 444         }
 445 }
 446
 447 function toggle_immersive() {
 448         if (global_default_opacity == 0.7) {
 449                 global_default_opacity = 0.0;
 450                 global_infobox = false;
 451                 document.getElementById('immersivetoggle').innerHTML = 'Show decorations';
 452         } else {
 453                 global_default_opacity = 0.7;
 454                 global_infobox = true;
 455                 document.getElementById('immersivetoggle').innerHTML = 'Hide all decorations';
 456         }
 457         relayout();
 458 }