/*
* 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
- * performance, we round down to the closest fit and use that.
+ * performance, we round down to the closest fit and use that. This
+ * function is a pessimal estimate of what thumbnail size we can _always_
+ * fit on the screen -- it's right if and only if all images are 4:3
+ * (and landscape). If individual size information is available, use
+ * pick_image_size, below.
*/
-function reduce_to_fixed_width(size)
+var fixed_sizes = [
+ [ 1600, 1200 ],
+ [ 1400, 1050 ],
+ [ 1280, 960 ],
+ [ 1024, 768 ],
+ [ 800, 600 ],
+ [ 640, 480 ],
+ [ 512, 384 ],
+ [ 320, 256 ],
+ [ 240, 192 ],
+ [ 120, 96 ],
+ [ 80, 64 ]
+];
+function max_image_size(screen_size)
{
- var fixed_sizes = [
- [ 1280, 960 ],
- [ 1024, 768 ],
- [ 800, 600 ],
- [ 640, 480 ],
- [ 512, 384 ],
- [ 320, 256 ],
- [ 240, 192 ],
- [ 120, 96 ],
- [ 80, 64 ]
- ];
var i;
for (i = 0; i < fixed_sizes.length; ++i) {
- if (size[0] >= fixed_sizes[i][0] && size[1] >= fixed_sizes[i][1]) {
+ if (screen_size[0] >= fixed_sizes[i][0] && screen_size[1] >= fixed_sizes[i][1]) {
return fixed_sizes[i];
}
}
return [ 80, 64 ];
}
+
+function pick_image_size(screen_size, image_size)
+{
+ var i;
+ for (i = 0; i < fixed_sizes.length; ++i) {
+ // this is a duplicate of pr0n's resizing code, hope for no floating-point
+ // inaccuracies :-)
+ var thumbxres = fixed_sizes[i][0];
+ var thumbyres = fixed_sizes[i][1];
+ var width = image_size[0];
+ var height = image_size[1];
+
+ if (!(thumbxres >= width && thumbyres >= height)) {
+ var sfh = width / thumbxres;
+ var sfv = height / thumbyres;
+ if (sfh > sfv) {
+ width /= sfh;
+ height /= sfh;
+ } else {
+ width /= sfv;
+ height /= sfv;
+ }
+ width = Math.floor(width);
+ height = Math.floor(height);
+ }
+
+ if (screen_size[0] >= width && screen_size[1] >= height) {
+ // be sure _not_ to return a reference
+ return [ fixed_sizes[i][0], fixed_sizes[i][1] ];
+ }
+ }
+ return [ 80, 64 ];
+}
function display_image(width, height, evt, filename, element_id)
{
return img;
}
-function prepare_preload(img, width, height, evt, filename)
+function display_image_num(num, element_id)
+{
+ var screen_size = find_width();
+ var adjusted_size;
+
+ if (global_image_list[num][2] == -1) {
+ // no size information, use our pessimal guess
+ adjusted_size = max_image_size(screen_size);
+ } else {
+ adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
+ }
+
+ var img = display_image(adjusted_size[0], adjusted_size[1], global_image_list[num][0], global_image_list[num][1], element_id);
+ if (element_id == "image") {
+ center_image(num);
+ }
+ return img;
+}
+
+function prepare_preload(img, num)
{
// cancel any pending preload
var preload = document.getElementById("preload");
// grmf -- IE doesn't fire onload if the image was loaded from cache, so check for
// completeness first; should at least be _somewhat_ better
if (img.complete) {
- display_image(width, height, evt, filename, "preload");
+ display_image_num(num, "preload");
} else {
- img.onload = function() { display_image(width, height, evt, filename, "preload"); };
+ img.onload = function() { display_image_num(num, "preload"); };
}
}
}
}
-function relayout()
+function center_image(num)
{
- var size = find_width();
- var adjusted_size = reduce_to_fixed_width(size);
+ var screen_size = find_width();
+ var adjusted_size;
+
+ if (global_image_list[num][2] == -1) {
+ // no size information, use our pessimal guess
+ adjusted_size = max_image_size(screen_size);
+ } else {
+ adjusted_size = pick_image_size(screen_size, [ global_image_list[num][2], global_image_list[num][3] ]);
+ }
- var img = display_image(adjusted_size[0], adjusted_size[1], global_image_list[global_image_num][0], global_image_list[global_image_num][1], "image");
- if (can_go_next()) {
- prepare_preload(img, adjusted_size[0], adjusted_size[1], global_image_list[global_image_num + 1][0], global_image_list[global_image_num + 1]);
+ // crop the div to the screen
+ if (adjusted_size[0] > screen_size[0]) {
+ adjusted_size[0] = screen_size[0];
}
-
+ if (adjusted_size[1] > screen_size[1]) {
+ adjusted_size[1] = screen_size[1];
+ }
+
// center the image on-screen
var main = document.getElementById("main");
main.style.position = "absolute";
- main.style.left = (size[0] - adjusted_size[0]) / 2 + "px";
- main.style.top = (size[1] - adjusted_size[1]) / 2 + "px";
+ main.style.left = (screen_size[0] - adjusted_size[0]) / 2 + "px";
+ main.style.top = (screen_size[1] - adjusted_size[1]) / 2 + "px";
main.style.width = adjusted_size[0] + "px";
main.style.height = adjusted_size[1] + "px";
main.style.lineHeight = adjusted_size[1] + "px";
+}
+
+function relayout()
+{
+ var img = display_image_num(global_image_num, "image");
+ if (can_go_next()) {
+ prepare_preload(img, global_image_num + 1);
+ }
+
+ center_image(global_image_num);
+
set_opacity("previous", can_go_previous() ? 0.7 : 0.1);
set_opacity("next", can_go_next() ? 0.7 : 0.1);
set_opacity("close", 0.7);
return;
}
- --global_image_num;
-
- var adjusted_size = reduce_to_fixed_width(find_width());
-
- var img = display_image(adjusted_size[0], adjusted_size[1], global_image_list[global_image_num][0], global_image_list[global_image_num][1], "image");
+ var img = display_image_num(--global_image_num, "image");
if (can_go_previous()) {
set_opacity("previous", 0.7);
- prepare_preload(img, adjusted_size[0], adjusted_size[1], global_image_list[global_image_num - 1][0], global_image_list[global_image_num - 1][1]);
+ prepare_preload(img, global_image_num - 1);
} else {
set_opacity("previous", 0.1);
}
return;
}
- ++global_image_num;
-
- var adjusted_size = reduce_to_fixed_width(find_width());
-
- var img = display_image(adjusted_size[0], adjusted_size[1], global_image_list[global_image_num][0], global_image_list[global_image_num][1], "image");
+ var img = display_image_num(++global_image_num, "image");
if (can_go_next()) {
set_opacity("next", 0.7);
- prepare_preload(img, adjusted_size[0], adjusted_size[1], global_image_list[global_image_num + 1][0], global_image_list[global_image_num + 1][1]);
+ prepare_preload(img, global_image_num + 1);
} else {
set_opacity("next", 0.1);
}
projects / pr0n / blobdiff