Handle non-integral device pixel ratios.

[pr0n] / files / pr0n-fullscreen.js

diff --git a/files/pr0n-fullscreen.js b/files/pr0n-fullscreen.js
index fe31090131fd1b7a546482e2219ad0a5fb59c2db..789cda741f5c15ab6f4c88e31dba5489ff0025a5 100644 (file)
--- a/files/pr0n-fullscreen.js
+++ b/files/pr0n-fullscreen.js
@@ -29,7 +29,8 @@ function find_width()
 {
        if (typeof(window.innerWidth) == 'number') {
                // non-IE
-               return [window.innerWidth, window.innerHeight];
+               var dpr = find_dpr();
+               return [window.innerWidth * dpr, window.innerHeight * dpr];
        } else if (document.documentElement && (document.documentElement.clientWidth || document.documentElement.clientHeight)) {
                // IE 6+ in 'standards compliant mode'
                return [document.documentElement.clientWidth, document.documentElement.clientHeight];
@@ -40,6 +41,11 @@ function find_width()
        return [null,null];
 }
 
+function find_dpr()
+{
+       return window.devicePixelRatio || 1;
+}
+
 /*
  * pr0n can resize to any size we'd like, but we're much more likely
  * to have this set of fixed-resolution screens cached, so to increase
@@ -148,6 +154,7 @@ function display_image(width, height, evt, filename, element_id)
        var url = "http://" + global_vhost + "/" + evt + "/" + width + "x" + height + "/nobox/" + filename;
        var main = document.getElementById("iehack");
        var preload = document.getElementById("preload");
+       var dpr = find_dpr();
        var img;
        // See if we have a preload going on that we can reuse.
        if (element_id == "image" && preload !== null && preload.src == url) {
@@ -159,14 +166,23 @@ function display_image(width, height, evt, filename, element_id)
        img.style.position = "absolute";
        img.style.left = "0px";
        img.style.top = "0px";
+       img.style.transformOrigin = "top left";
+       img.style.transform = "scale(" + (1.0 / dpr) + ")";
 
        if (global_infobox != 'nobox/') {
-               var url = "http://" + global_vhost + "/" + evt + "/" + width + "x" + height + "/box/" + filename;
+               var url;
+               if (dpr == 1) {
+                       url = "http://" + global_vhost + "/" + evt + "/" + width + "x" + height + "/box/" + filename;
+               } else {
+                       url = "http://" + global_vhost + "/" + evt + "/" + width + "x" + height + "@" + dpr.toFixed(2) + "/box/" + filename;
+               }
                var boximg = replace_image_element(url, element_id + "_box", main);
 
                boximg.style.position = "absolute";
                boximg.style.left = "0px";
                boximg.style.bottom = "-1px";
+               boximg.style.transformOrigin = "bottom left";
+               boximg.style.transform = "scale(" + (1.0 / dpr) + ")";
        }
 
        return img;
@@ -267,6 +283,7 @@ function set_opacity(id, amount)
 function center_image(num)
 {
        var screen_size = find_width();
+       var dpr = find_dpr();
        var width, height;
        
        if (global_image_list[num][2] == -1) {
@@ -284,11 +301,11 @@ function center_image(num)
        // center the image on-screen
        var main = document.getElementById("main");
        main.style.position = "absolute";
-       main.style.left = (screen_size[0] - width) / 2 + "px";
-       main.style.top = (screen_size[1] - height) / 2 + "px"; 
-       main.style.width = width + "px";
-       main.style.height = height + "px";
-       main.style.lineHeight = height + "px";
+       main.style.left = (((screen_size[0] - width) / 2) / dpr) + "px";
+       main.style.top = (((screen_size[1] - height) / 2) / dpr) + "px";
+       main.style.width = (width / dpr) + "px";
+       main.style.height = (height / dpr) + "px";
+       main.style.lineHeight = (height / dpr) + "px";
 }
 
 function relayout()