GList *FontSupport::layoutText(const WFont& font,
const std::string& utf8,
std::vector<PangoGlyphString *>& glyphs,
int& width)
{
PANGO_LOCK;
enabledFontFormats = enabledFontFormats_;
FontMatch match = matchFont(font);
PangoAttrList *attrs = pango_attr_list_new();
pango_context_set_font_description(context_, match.pangoFontDescription());
GList *items
= pango_itemize(context_, utf8.c_str(), 0, utf8.length(), attrs, nullptr);
width = 0;
for (GList *elem = items; elem; elem = elem->next) {
PangoItem *item = (PangoItem *)elem->data;
PangoAnalysis *analysis = &item->analysis;
PangoGlyphString *gl = pango_glyph_string_new();
pango_shape(utf8.c_str() + item->offset, item->length, analysis, gl);
glyphs.push_back(gl);
if (device_) {
currentFont_ = analysis->font;
WTextItem textItem
= device_->measureText(WString::fromUTF8(utf8.substr(item->offset,
item->length)),
-1, false);
width += pangoUnitsFromDouble(textItem.width());
currentFont_ = nullptr;
} else
width += pango_glyph_string_get_width(gl);
}
pango_attr_list_unref(attrs);
return items;
}
static VALUE
rglyph_get_width(VALUE self)
{
return INT2NUM(pango_glyph_string_get_width(_SELF(self)));
}
void FontSupport::drawText(const WFont& font, const WRectF& rect,
const WTransform& transform, Bitmap& bitmap,
WFlags<AlignmentFlag> flags,
const WString& text)
{
PANGO_LOCK;
enabledFontFormats = enabledFontFormats_;
PangoMatrix matrix;
matrix.xx = transform.m11();
matrix.xy = transform.m21();
matrix.yx = transform.m12();
matrix.yy = transform.m22();
matrix.x0 = transform.dx();
matrix.y0 = transform.dy();
std::string utf8 = text.toUTF8();
std::vector<PangoGlyphString *> glyphs;
int width;
pango_context_set_matrix(context_, &matrix);
/*
* Oh my god, somebody explain me why we need to do this...
*/
WFont f = font;
f.setSize(font.sizeLength().toPixels()
/ pango_matrix_get_font_scale_factor(&matrix));
GList *items = layoutText(f, utf8, glyphs, width);
pango_context_set_matrix(context_, nullptr);
AlignmentFlag hAlign = flags & AlignHorizontalMask;
/* FIXME handle bidi ! */
double x;
switch (hAlign) {
case AlignmentFlag::Left:
x = rect.left();
break;
case AlignmentFlag::Right:
x = rect.right() - pangoUnitsToDouble(width);
break;
case AlignmentFlag::Center:
x = rect.center().x() - pangoUnitsToDouble(width/2);
break;
default:
x = 0;
}
AlignmentFlag vAlign = flags & AlignVerticalMask;
PangoFont *pangoFont = matchFont(font).pangoFont();
PangoFontMetrics *metrics = pango_font_get_metrics(pangoFont, nullptr);
double ascent
= pangoUnitsToDouble(pango_font_metrics_get_ascent(metrics));
double descent
= pangoUnitsToDouble(pango_font_metrics_get_descent(metrics));
pango_font_metrics_unref(metrics);
double baseline = ascent;
double height = ascent + descent;
double y;
switch (vAlign) {
case AlignmentFlag::Top:
y = rect.top() + baseline;
break;
case AlignmentFlag::Middle:
y = rect.center().y() - height / 2 + baseline;
break;
case AlignmentFlag::Bottom:
y = rect.bottom() - height + baseline;
break;
default:
y = 0;
}
FT_Bitmap bmp;
bmp.buffer = bitmap.buffer();
bmp.width = bitmap.width();
bmp.rows = bitmap.height();
bmp.pitch = bitmap.pitch();
bmp.pixel_mode = FT_PIXEL_MODE_GRAY;
bmp.num_grays = 16; // ???
GList *elem;
unsigned i = 0;
for (elem = items; elem; elem = elem->next) {
PangoItem *item = (PangoItem *)elem->data;
PangoAnalysis *analysis = &item->analysis;
PangoGlyphString *gl = glyphs[i++];
pango_ft2_render_transformed(&bmp, &matrix,
analysis->font, gl,
pangoUnitsFromDouble(x),
pangoUnitsFromDouble(y));
x += pangoUnitsToDouble(pango_glyph_string_get_width(gl));
pango_glyph_string_free(gl);
pango_item_free(item);
}
g_list_free(items);
}
