Stopped setting assumed screen resolution in Mozilla/XULRunner 1.8 since the browser...

[videolink.git] / README

diff --git a/README b/README
index dfa4ff5fbbf3a6d8b4264eee90796d36eb85f28c..c273e4379124fa69b0882ee003b849229cc6f463 100644 (file)
--- a/README
+++ b/README
@@ -19,7 +19,7 @@ VideoLink depends on the following software:
 - expat 1.x
 - Gtkmm 2.0
 - ffmpeg or mjpegtools
-- Mozilla 1.7.x (later versions may work but are untested)
+- Mozilla 1.7.8 or later, or XULRunner
 - netpbm
 - Xvfb (from XFree86 or X.org)
 
@@ -139,12 +139,12 @@ reason VideoLink applies a stylesheet to all pages that adds 60 pixels of
 padding on all sides of the body; this doesn't apply to the
 background.
 
-Prior to Mozilla version 1.8, which I have not yet tested, Mozilla may
-signal that a page is completely loaded before any background images
-are loaded and displayed.  This results in snapshots that do not
-include background images.  You can work around this by using
-absolutely-positioned "inline" images, or attempt to build VideoLink
-against Mozilla 1.8.
+Prior to version 1.8, Mozilla may signal that a page is completely
+loaded before any background images are loaded and displayed.  This
+can result in VideoLink converting the page without the background
+images.  If VideoLink is built with an older version of Mozilla you
+can work around this by using absolutely-positioned "inline" images,
+since Mozilla will always wait for these to load.
 
 DVD players do not have "back" buttons, so you should generally
 provide links to "higher" menu pages.  However, they do have a button
@@ -176,6 +176,34 @@ aspect ratio and sample rate.  However, each chapter will run into the
 next.  If this is a real problem, let me know, and I may be able to
 provide a better solution in a later version of VideoLink.
 
+Bugs
+----
+
+Under Mozilla 1.7, VideoLink sets the assumed screen resolution to
+40 dpi, which I reckon to be the average resolution of a standard
+definition TV display.  This should mean that text with a font size
+expressed in millimetres or points will appear around the specified
+size.  Unfortunately this setting has a different effect under
+Mozilla/XULRunner 1.8:
+
+Mozilla   Assumed    Requested     Actual size
+version  resolution    size     (pixels) (inches)
+           (dpi)
+
+  1.7    default:96    20 px       20      0.5
+  1.7    default:96    36 pt       48      1.2
+  1.7        40        20 px       20      0.5
+  1.7        40        36 pt       20      0.5
+  1.8    default:96    20 px       20      0.5
+  1.8    default:96    36 pt       48      1.2
+  1.8        40        20 px       48      1.2
+  1.8        40        36 pt       48      1.2
+
+From version 0.10, until I have a proper solution, VideoLink will not
+set the assumed screen resolution under Mozilla 1.8.  I must advise
+against using font sizes in millimetres or points since they will vary
+between browser versions.
+
 Author and copyright
 --------------------