anne/lyx_mirror
1
0
Fork 0
mirror of https://git.lyx.org/repos/lyx.git synced 2025-01-22 07:42:02 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Do not modify the changed() status of rows when no drawing has taken place

Browse Source 
There are several places in the code where a row is painted with drawing disabled in the painter. The goal is only to recompute inset positions.

Such a case happens in BufferView::checkCursorScrollOffset, as part of the horizontal scrolling patch. Note that this particular piece of code should eventually be removed, since it is a performance problem.

It makes sense to consider that only a real painting of a row should change its status. However, I would not be surprised if this change would break other things.

Fixes: #9388
This commit is contained in:
Jean-Marc Lasgouttes 2015-01-30 11:18:04 +01:00
parent 7a2ac2f08d
commit 51cc1a1cbe
2 changed files with 18 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/BufferView.cpp
View File

@ -2970,6 +2970,19 @@ void BufferView::checkCursorScrollOffset(PainterInfo & pi)
// Set the row on which the cursor lives.
setCurrentRowSlice(rowSlice);
/** FIXME: the code below adds an extraneous computation of inset
* positions, and can therefore be bad for performance (think for
* example about a very large tabular inset. Redawing the row
* where it is means redrawing the whole screen).
*
* The bug that this fixes is the following: assume that there is
* a very large math inset. Upon entering the inset, when pressing
* `End', the row is not scrolled and the cursor is not visible. I
* am not sure why the extra row computation fixes the problem,
* actually.
*
* A proper fix should be found and this code should be removed.
*/
// Force the recomputation of inset positions
bool const drawing = pi.pain.isDrawingEnabled();
pi.pain.setDrawingEnabled(false);
@ -2978,6 +2991,7 @@ void BufferView::checkCursorScrollOffset(PainterInfo & pi)
-d->horiz_scroll_offset_, 0);
rp.paintText();
pi.pain.setDrawingEnabled(drawing);
/** END of bad code */
// Current x position of the cursor in pixels
int const cur_x = getPos(d->cursor_).x_;

6
src/TextMetrics.cpp
View File

@ -1878,7 +1878,8 @@ void TextMetrics::drawParagraph(PainterInfo & pi, pit_type const pit, int const
}
// Row signature; has row changed since last paint?
row.setCrc(pm.computeRowSignature(row, bparams));
if (pi.pain.isDrawingEnabled())
row.setCrc(pm.computeRowSignature(row, bparams));
bool row_has_changed = row.changed()
|| rowSlice == bv_->lastRowSlice();
@ -1916,7 +1917,8 @@ void TextMetrics::drawParagraph(PainterInfo & pi, pit_type const pit, int const
LYXERR(Debug::PAINTING, foreword << "pit=" << pit << " row=" << i
<< " row_selection=" << row.selection()
<< " full_repaint=" << pi.full_repaint
<< " row_has_changed=" << row_has_changed);
<< " row_has_changed=" << row_has_changed
<< " drawingEnabled=" << pi.pain.isDrawingEnabled());
}
// Backup full_repaint status and force full repaint