WTextItem WPdfImage::measureText(const WString& text, double maxWidth,
bool wordWrap)
{
if (trueTypeFont_ && !trueTypeFonts_->busy())
return trueTypeFonts_->measureText(painter()->font(), text, maxWidth,
wordWrap);
else {
HPDF_REAL width = 0;
if (!wordWrap)
maxWidth = 1E9;
else
maxWidth += EPSILON;
if (trueTypeFonts_->busy())
setChanged(PainterChangeFlag::Font);
std::string s = trueTypeFont_ ? text.toUTF8() : text.narrow();
int bytes = HPDF_Page_MeasureText(page_, s.c_str(), maxWidth, wordWrap,
&width);
if (trueTypeFont_)
return WTextItem(WString::fromUTF8(s.substr(0, bytes)), width);
else
return WTextItem(text.value().substr(0, bytes), width);
}
}
WTextItem WRasterImage::measureText(const WString& text, double maxWidth,
bool wordWrap)
{
SkScalar w =
impl_->textPaint_.measureText(text.toUTF8().c_str(), text.toUTF8().size());
return WTextItem(text, SkScalarToFloat(w), -1);
// TODO: what about wordwrap?
}
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);
}
}
