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Unsightly hack around flickering to white in nsgtk. This needs to be sorted out properly as a matter of urgency.

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svn path=/trunk/netsurf/; revision=4005
This commit is contained in:
John Mark Bell 2008-03-21 00:14:01 +00:00
parent 7bc2306612
commit c1efc9c275
1 changed files with 37 additions and 0 deletions
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37
render/layout.c
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@ -187,7 +187,44 @@ bool layout_block_context(struct box *block, struct content *content)
assert(block->width != UNKNOWN_WIDTH);
assert(block->width != AUTO);
#ifdef riscos
/* Why the ifdef? You don't really want to know. If you do, read on.
*
* So, the only way into this function is through the rest of the
* layout code. The only external entry points into the layout code
* are layout_document and layout_inline_container. The latter is only
* ever called when editing text in form textareas, so we can ignore it
* for the purposes of this discussion.
*
* layout_document is only ever called from html_reformat, which itself
* is only ever called from content_reformat. content_reformat locks
* the content structure while reformatting is taking place.
*
* If we call gui_multitask here, then any pending UI events will get
* processed. This includes window expose/redraw events. Upon receipt
* of these events, the UI code will call content_redraw for the
* window's content. content_redraw will return immediately if the
* content is currently locked (which it will be if we're still doing
* layout).
*
* On RISC OS, this isn't a problem as the UI code's window redraw
* handler explicitly checks for locked contents and does nothing
* in that case. This effectively means that the window contents
* aren't updated, so whatever's already in the window will remain
* on-screen. On GTK, however, redraw is not direct-to-screen, but
* to a pixmap which is then blitted to screen. If we perform no
* redraw, then the pixmap will be flat white. When this is
* subsequently blitted, the user gets greeted with an unsightly
* flicker to white (and then back to the document when the content
* is redrawn when unlocked).
*
* In the long term, this upcall into the GUI event dispatch code needs
* to disappear. It needs to remain for the timebeing, however, as
* document reflow can be fairly time consuming and we need to remain
* responsive to user input.
*/
gui_multitask();
#endif
block->float_children = 0;