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text: Support explicit direction even with harfbuzz disabled

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Fixes #1591
This commit is contained in:
rdb 2024-01-23 16:45:39 +01:00
parent ca9b5dd44a
commit 23772c4722
1 changed files with 41 additions and 0 deletions
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41
panda/src/text/textAssembler.cxx
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@ -1411,6 +1411,10 @@ assemble_row(TextAssembler::TextRow &row,
PN_stdfloat xpos = 0.0f;
align = TextProperties::A_left;
TextProperties::Direction dir = TextProperties::D_ltr;
size_t rtl_begin = 0;
PN_stdfloat rtl_begin_xpos = 0.0f;
// Remember previous character, for kerning.
int prev_char = -1;
@ -1472,6 +1476,8 @@ assemble_row(TextAssembler::TextRow &row,
// Shape the buffer accumulated so far.
shape_buffer(harfbuff, placed_glyphs, xpos, prev_cprops->_properties);
hb_buffer_reset(harfbuff);
rtl_begin = placed_glyphs.size();
rtl_begin_xpos = xpos;
} else if (harfbuff == nullptr && text_use_harfbuzz &&
font->is_of_type(DynamicTextFont::get_class_type())) {
@ -1486,6 +1492,29 @@ assemble_row(TextAssembler::TextRow &row,
}
#endif
// When not using harfbuzz, check if the direction was set explicitly.
if (properties->has_direction() && properties->get_direction() != dir) {
if (dir == TextProperties::D_rtl) {
// Flip the preceding characters.
PN_stdfloat xpos2 = xpos;
size_t i = placed_glyphs.size();
while (i > rtl_begin) {
--i;
PN_stdfloat new_xpos = rtl_begin_xpos + (xpos - xpos2);
xpos2 = placed_glyphs[i]._xpos;
placed_glyphs[i]._xpos = new_xpos;
}
dir = TextProperties::D_ltr;
}
else if (dir == TextProperties::D_ltr) {
// When switching to right-to-left, keep track of the first glyph that
// was RTL so that we can later offset the X positions.
dir = TextProperties::D_rtl;
rtl_begin = placed_glyphs.size();
rtl_begin_xpos = xpos;
}
}
if (character == ' ') {
// A space is a special case.
xpos += properties->get_glyph_scale() * properties->get_text_scale() * font->get_space_advance();
@ -1651,6 +1680,18 @@ assemble_row(TextAssembler::TextRow &row,
}
}
if (dir == TextProperties::D_rtl) {
// Flip the preceding characters.
PN_stdfloat xpos2 = xpos;
size_t i = placed_glyphs.size();
while (i > rtl_begin) {
--i;
PN_stdfloat new_xpos = rtl_begin_xpos + (xpos - xpos2);
xpos2 = placed_glyphs[i]._xpos;
placed_glyphs[i]._xpos = new_xpos;
}
}
#ifdef HAVE_HARFBUZZ
if (harfbuff != nullptr && hb_buffer_get_length(harfbuff) > 0) {
shape_buffer(harfbuff, placed_glyphs, xpos, prev_cprops->_properties);