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Remove redundant computation.

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Fix nsfont_split to actually conform to its API and not return split points in the middle of character byte sequences.

svn path=/trunk/netsurf/; revision=11264
This commit is contained in:
John Mark Bell 2011-01-09 00:52:00 +00:00
parent fe291f87d9
commit a145763c1d
1 changed files with 27 additions and 14 deletions
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39
gtk/font_pango.c
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@ -123,9 +123,8 @@ bool nsfont_position_in_string(const plot_font_style_t *fstyle,
pango_layout_set_font_description(layout, desc);
pango_layout_set_text(layout, string, length);
pango_layout_xy_to_index(layout, x * PANGO_SCALE, 0, &index, 0);
if (pango_layout_xy_to_index(layout, x * PANGO_SCALE,
0, &index, 0) == 0)
0, &index, 0) == FALSE)
index = length;
pango_layout_index_to_pos(layout, index, &pos);
@ -166,8 +165,6 @@ bool nsfont_split(const plot_font_style_t *fstyle,
PangoContext *context;
PangoLayout *layout;
PangoLayoutLine *line;
PangoLayoutIter *iter;
PangoRectangle rect;
desc = nsfont_style_to_description(fstyle);
context = gdk_pango_context_get();
@ -175,23 +172,39 @@ bool nsfont_split(const plot_font_style_t *fstyle,
pango_layout_set_font_description(layout, desc);
pango_layout_set_text(layout, string, length);
/* Limit width of layout to the available width */
pango_layout_set_width(layout, x * PANGO_SCALE);
pango_layout_set_wrap(layout, PANGO_WRAP_WORD);
pango_layout_set_single_paragraph_mode(layout, true);
line = pango_layout_get_line(layout, 1);
if (line)
index = line->start_index - 1;
iter = pango_layout_get_iter(layout);
pango_layout_iter_get_line_extents(iter, NULL, &rect);
pango_layout_iter_free(iter);
/* Request word wrapping */
pango_layout_set_wrap(layout, PANGO_WRAP_WORD);
/* Prevent pango treating linebreak characters as line breaks */
pango_layout_set_single_paragraph_mode(layout, TRUE);
/* Obtain the second line of the layout (if there is one) */
line = pango_layout_get_line(layout, 1);
if (line != NULL) {
/* Pango split the text. The line's start_index indicates the
* start of the character after the line break. */
index = line->start_index;
/* We must ensure that the split character is a space so that
* we meet the API postcondition. Therefore, scan backwards
* through the string and stop when we hit the start of
* the string or find a space. */
while (index > 0) {
if (string[--index] == ' ')
break;
}
}
g_object_unref(layout);
g_object_unref(context);
pango_font_description_free(desc);
*char_offset = index;
*actual_x = PANGO_PIXELS(rect.width);
/* Obtain the pixel offset of the split character */
nsfont_width(fstyle, string, index, actual_x);
return true;
}