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Bug 337603 – Possible off-by-one in

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2006-06-06  Behdad Esfahbod  <behdad@gnome.org>

        Bug 337603 – Possible off-by-one in
        gdk_pango_layout_line_get_clip_region

        * gdk/gdkpango.c (gdk_pango_layout_line_get_clip_region): Correct
        rounding of rect members.  Improved docs.
This commit is contained in:
Behdad Esfahbod 2006-06-07 01:07:20 +00:00 committed by Behdad Esfahbod
parent e366da90d6
commit d3874d0918
3 changed files with 35 additions and 5 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2006-06-06 Behdad Esfahbod <behdad@gnome.org>
Bug 337603 – Possible off-by-one in
gdk_pango_layout_line_get_clip_region
* gdk/gdkpango.c (gdk_pango_layout_line_get_clip_region): Correct
rounding of rect members. Improved docs.
2006-06-06 Matthias Clasen <mclasen@redhat.com>
* gtk/gtkicontheme.c: Small optimization

8
ChangeLog.pre-2-10
View File

@ -1,3 +1,11 @@
2006-06-06 Behdad Esfahbod <behdad@gnome.org>
Bug 337603 – Possible off-by-one in
gdk_pango_layout_line_get_clip_region
* gdk/gdkpango.c (gdk_pango_layout_line_get_clip_region): Correct
rounding of rect members. Improved docs.
2006-06-06 Matthias Clasen <mclasen@redhat.com>
* gtk/gtkicontheme.c: Small optimization

24
gdk/gdkpango.c
View File

@ -1238,6 +1238,11 @@ gdk_pango_attr_embossed_new (gboolean embossed)
* contained inside the line. This is to draw the selection all the way
* to the side of the layout. However, the clip region is in line coordinates,
* not layout coordinates.
*
* Note that the regions returned correspond to logical extents of the text
* ranges, not ink extents. So the drawn line may in fact touch areas out of
* the clip region. The clip region is mainly useful for highlightling parts
* of text, such as when text is selected.
*
* Return value: a clip region containing the given ranges
**/
@ -1287,12 +1292,16 @@ gdk_pango_layout_line_get_clip_region (PangoLayoutLine *line,
for (j = 0; j < n_pixel_ranges; j++)
{
GdkRectangle rect;
int x_off, y_off;
rect.x = x_origin + pixel_ranges[2*j] / PANGO_SCALE - logical_rect.x / PANGO_SCALE;
rect.y = y_origin - (baseline / PANGO_SCALE - logical_rect.y / PANGO_SCALE);
rect.width = (pixel_ranges[2*j + 1] - pixel_ranges[2*j]) / PANGO_SCALE;
rect.height = logical_rect.height / PANGO_SCALE;
x_off = PANGO_PIXELS (pixel_ranges[2*j] - logical_rect.x);
y_off = PANGO_PIXELS (baseline - logical_rect.y);
rect.x = x_origin + x_off;
rect.y = y_origin - y_off;
rect.width = PANGO_PIXELS (pixel_ranges[2*j + 1] - logical_rect.x) - x_off;
rect.height = PANGO_PIXELS (baseline - logical_rect.y + logical_rect.height) - y_off;
gdk_region_union_with_rect (clip_region, &rect);
}
@ -1316,6 +1325,11 @@ gdk_pango_layout_line_get_clip_region (PangoLayoutLine *line,
* you would pass to gdk_draw_layout_line(). @index_ranges should contain
* ranges of bytes in the layout's text.
*
* Note that the regions returned correspond to logical extents of the text
* ranges, not ink extents. So the drawn line may in fact touch areas out of
* the clip region. The clip region is mainly useful for highlightling parts
* of text, such as when text is selected.
*
* Return value: a clip region containing the given ranges
**/
GdkRegion*