void
Canvas::formatted_text(PixelRect *rc, const TCHAR *text, unsigned format) {
if (font == NULL)
return;
UPixelScalar skip = font->GetLineSpacing();
unsigned max_lines = (format & DT_CALCRECT) ? -1 :
(rc->bottom - rc->top + skip - 1) / skip;
size_t len = _tcslen(text);
TCHAR *duplicated = new TCHAR[len + 1], *p = duplicated;
unsigned lines = 1;
for (const TCHAR *i = text; *i != _T('\0'); ++i) {
TCHAR ch = *i;
if (ch == _T('\n')) {
/* explicit line break */
if (++lines >= max_lines)
break;
ch = _T('\0');
} else if (ch == _T('\r'))
/* skip */
continue;
else if ((unsigned)ch < 0x20)
/* replace non-printable characters */
ch = _T(' ');
*p++ = ch;
}
*p = _T('\0');
len = p - duplicated;
// simple wordbreak algorithm. looks for single spaces only, no tabs,
// no grouping of multiple spaces
if (format & DT_WORDBREAK) {
for (size_t i = 0; i < len; i += _tcslen(duplicated + i) + 1) {
PixelSize sz = CalcTextSize(duplicated + i);
TCHAR *prev_p = NULL;
// remove words from behind till line fits or no more space is found
while (sz.cx > rc->right - rc->left &&
(p = _tcsrchr(duplicated + i, _T(' '))) != NULL) {
if (prev_p)
*prev_p = _T(' ');
*p = _T('\0');
prev_p = p;
sz = CalcTextSize(duplicated + i);
}
if (prev_p) {
lines++;
if (lines >= max_lines)
break;
}
}
}
if (format & DT_CALCRECT) {
rc->bottom = rc->top + lines * skip;
delete[] duplicated;
return;
}
PixelScalar y = (format & DT_VCENTER) && lines < max_lines
? (PixelScalar)(rc->top + rc->bottom - lines * skip) / 2
: rc->top;
for (size_t i = 0; i < len; i += _tcslen(duplicated + i) + 1) {
if (duplicated[i] != _T('\0')) {
PixelScalar x;
if (format & (DT_RIGHT | DT_CENTER)) {
PixelSize sz = CalcTextSize(duplicated + i);
x = (format & DT_CENTER) ? (rc->left + rc->right - sz.cx)/2 :
rc->right - sz.cx; // DT_RIGHT
} else { // default is DT_LEFT
x = rc->left;
}
TextAutoClipped(x, y, duplicated + i);
}
y += skip;
if (y >= rc->bottom)
break;
}
delete[] duplicated;
}
unsigned
Canvas::DrawFormattedText(const PixelRect r, const TCHAR *text,
unsigned format)
{
assert(text != nullptr);
#ifndef UNICODE
assert(ValidateUTF8(text));
#endif
if (font == nullptr)
return 0;
unsigned skip = font->GetLineSpacing();
unsigned max_lines = (format & DT_CALCRECT) ? -1 :
(r.GetHeight() + skip - 1) / skip;
size_t len = _tcslen(text);
TCHAR *duplicated = new TCHAR[len + 1], *p = duplicated;
unsigned lines = 1;
for (const TCHAR *i = text; *i != _T('\0'); ++i) {
TCHAR ch = *i;
if (ch == _T('\n')) {
/* explicit line break */
if (++lines > max_lines)
break;
ch = _T('\0');
} else if (ch == _T('\r'))
/* skip */
continue;
else if ((unsigned)ch < 0x20)
/* replace non-printable characters */
ch = _T(' ');
*p++ = ch;
}
*p = _T('\0');
len = p - duplicated;
// simple wordbreak algorithm. looks for single spaces only, no tabs,
// no grouping of multiple spaces
for (size_t i = 0; i < len; i += _tcslen(duplicated + i) + 1) {
PixelSize sz = CalcTextSize(duplicated + i);
TCHAR *prev_p = nullptr;
// remove words from behind till line fits or no more space is found
while (unsigned(sz.cx) > r.GetWidth() &&
(p = StringFindLast(duplicated + i, _T(' '))) != nullptr) {
if (prev_p)
*prev_p = _T(' ');
*p = _T('\0');
prev_p = p;
sz = CalcTextSize(duplicated + i);
}
if (prev_p) {
lines++;
if (lines >= max_lines)
break;
}
}
if (format & DT_CALCRECT) {
delete[] duplicated;
return lines * skip;
}
int y = (format & DT_VCENTER) && lines < max_lines
? (r.top + r.bottom - lines * skip) / 2
: r.top;
for (size_t i = 0; i < len; i += _tcslen(duplicated + i) + 1) {
if (duplicated[i] != _T('\0')) {
int x;
if (format & (DT_RIGHT | DT_CENTER)) {
PixelSize sz = CalcTextSize(duplicated + i);
x = (format & DT_CENTER)
? (r.left + r.right - sz.cx) / 2
: r.right - sz.cx; // DT_RIGHT
} else { // default is DT_LEFT
x = r.left;
}
TextAutoClipped(x, y, duplicated + i);
if (format & DT_UNDERLINE)
DrawHLine(x, x + CalcTextWidth(duplicated + i),
y + font->GetAscentHeight() + 1, text_color);
}
y += skip;
if (y >= r.bottom)
break;
}
delete[] duplicated;
return lines * skip;
}
