void WMeasurePaintDevice::drawText(const WRectF& rect,
WFlags<AlignmentFlag> flags,
TextFlag textFlag, const WString& text,
const WPointF *clipPoint)
{
if (clipPoint && painter()) {
if (!painter()->clipPathTransform().map(painter()->clipPath())
.isPointInPath(painter()->worldTransform().map(*clipPoint)))
return;
}
double w = 0, h = 0;
WString line = text;
WFontMetrics fm = fontMetrics();
for (;;) {
WTextItem t = measureText(line, rect.width(),
textFlag == TextWordWrap ? true : false);
h += fm.height();
w = std::max(w, t.width());
if (t.text() == line)
break;
else
line = WString
::fromUTF8(line.toUTF8().substr(t.text().toUTF8().length()));
}
AlignmentFlag horizontalAlign = flags & AlignHorizontalMask;
AlignmentFlag verticalAlign = flags & AlignVerticalMask;
double x, y;
switch (horizontalAlign) {
case AlignLeft:
x = rect.left(); break;
case AlignCenter:
x = rect.left() + (rect.width() - w) / 2; break;
case AlignRight:
default:
x = rect.right() - w; break;
}
switch (verticalAlign) {
case AlignTop:
y = rect.top(); break;
case AlignMiddle:
y = rect.top() + (rect.height() - h) / 2; break;
case AlignBottom:
default:
y = rect.bottom() - h; break;
}
expandBounds(WRectF(x, y, w, h));
}
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;
}
WTextItem FontSupport::measureText(const WFont& font, const WString& text,
double maxWidth, bool wordWrap)
{
PANGO_LOCK;
enabledFontFormats = enabledFontFormats_;
/*
* Note: accurate measuring on a bitmap requires that the transformation
* is applied, because hinting may push chars to boundaries e.g. when
* rotated (or scaled too?)
*/
std::string utf8 = text.toUTF8();
const char *s = utf8.c_str();
if (wordWrap) {
int utflen = g_utf8_strlen(s, -1);
PangoLogAttr *attrs = new PangoLogAttr[utflen + 1];
PangoLanguage *language = pango_language_from_string("en-US");
pango_get_log_attrs(s, utf8.length(), -1, language, attrs, utflen + 1);
double w = 0, nextW = -1;
int current = 0;
int measured = 0;
int end = 0;
bool maxWidthReached = false;
for (int i = 0; i < utflen + 1; ++i) {
if (i == utflen || attrs[i].is_line_break) {
int cend = g_utf8_offset_to_pointer(s, end) - s;
WTextItem ti
= measureText(font, WString::fromUTF8(utf8.substr(measured,
cend - measured)),
-1, false);
if (isEpsilonMore(w + ti.width(), maxWidth)) {
nextW = ti.width();
maxWidthReached = true;
break;
} else {
measured = cend;
current = g_utf8_offset_to_pointer(s, i) - s;
w += ti.width();
if (i == utflen) {
w += measureText(font, WString::fromUTF8(utf8.substr(measured)),
-1, false).width();
measured = utf8.length();
}
}
}
if (!attrs[i].is_white)
end = i + 1;
}
delete[] attrs;
if (maxWidthReached) {
return WTextItem(WString::fromUTF8(utf8.substr(0, current)), w, nextW);
} else {
/*
* For some reason, the sum of the individual widths is a bit less
* (for longer stretches of text), so we re-measure it !
*/
w = measureText(font, WString::fromUTF8(utf8.substr(0, measured)),
-1, false).width();
return WTextItem(text, w);
}
} else {
std::vector<PangoGlyphString *> glyphs;
int width;
GList *items = layoutText(font, utf8, glyphs, width);
double w = pangoUnitsToDouble(width);
for (unsigned i = 0; i < glyphs.size(); ++i)
pango_glyph_string_free(glyphs[i]);
g_list_foreach(items, (GFunc) pango_item_free, nullptr);
g_list_free(items);
return WTextItem(text, w);
}
}
void FontSupport::drawText(const WFont& font, const WRectF& rect,
WFlags<AlignmentFlag> flags, const WString& text)
{
PANGO_LOCK;
enabledFontFormats = enabledFontFormats_;
std::string utf8 = text.toUTF8();
std::vector<PangoGlyphString *> glyphs;
int width;
GList *items = layoutText(font, utf8, glyphs, width);
AlignmentFlag hAlign = flags & AlignHorizontalMask;
AlignmentFlag vAlign = flags & AlignVerticalMask;
/* 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;
}
unsigned i = 0;
for (GList *elem = items; elem; elem = elem->next) {
PangoItem *item = (PangoItem *)elem->data;
PangoAnalysis *analysis = &item->analysis;
PangoGlyphString *gl = glyphs[i++];
currentFont_ = analysis->font;
/*
* Note, we are actually ignoring the selected glyphs here, which
* is a pitty and possibly wrong if the device does not make the
* same selection !
*/
WString s = WString::fromUTF8(utf8.substr(item->offset,
item->length));
device_->drawText(WRectF(x, rect.y(),
1000, rect.height()),
AlignmentFlag::Left | vAlign, TextFlag::SingleLine,
s, nullptr);
WTextItem textItem = device_->measureText(s, -1, false);
x += textItem.width();
pango_item_free(item);
pango_glyph_string_free(gl);
}
g_list_free(items);
currentFont_ = nullptr;
}
