ENH:update mo of dailytip

Change-Id: I168159af60bbda827d24238f656aeaa192fd4299

src/slic3r/GUI/HintNotification.cpp

@@ -590,6 +590,76 @@ void NotificationManager::HintNotification::count_spaces()
 	m_window_width = m_line_height * 25;
 }
 
+static int get_utf8_seq_length(const char* seq, size_t size)
+{
+	int length = 0;
+	unsigned char c = seq[0];
+	if (c < 0x80) { // 0x00-0x7F
+		// is ASCII letter
+		length++;
+	}
+	// Bytes 0x80 to 0xBD are trailer bytes in a multibyte sequence.
+	// pos is in the middle of a utf-8 sequence. Add the utf-8 trailer bytes.
+	else if (c < 0xC0) { // 0x80-0xBF
+		length++;
+		while (length < size) {
+			c = seq[length];
+			if (c < 0x80 || c >= 0xC0) {
+				break; // prevent overrun
+			}
+			length++; // add a utf-8 trailer byte
+		}
+	}
+	// Bytes 0xC0 to 0xFD are header bytes in a multibyte sequence.
+	// The number of one bits above the topmost zero bit indicates the number of bytes (including this one) in the whole sequence.
+	else if (c < 0xE0) { // 0xC0-0xDF
+	 // add a utf-8 sequence (2 bytes)
+		if (2 > size) {
+			return size; // prevent overrun
+		}
+		length += 2;
+	}
+	else if (c < 0xF0) { // 0xE0-0xEF
+	 // add a utf-8 sequence (3 bytes)
+		if (3 > size) {
+			return size; // prevent overrun
+		}
+		length += 3;
+	}
+	else if (c < 0xF8) { // 0xF0-0xF7
+	 // add a utf-8 sequence (4 bytes)
+		if (4 > size) {
+			return size; // prevent overrun
+		}
+		length += 4;
+	}
+	else if (c < 0xFC) { // 0xF8-0xFB
+	 // add a utf-8 sequence (5 bytes)
+		if (5 > size) {
+			return size; // prevent overrun
+		}
+		length += 5;
+	}
+	else if (c < 0xFE) { // 0xFC-0xFD
+	 // add a utf-8 sequence (6 bytes)
+		if (6 > size) {
+			return size; // prevent overrun
+		}
+		length += 6;
+	}
+	else { // 0xFE-0xFF
+	 // not a utf-8 sequence
+		length++;
+	}
+	return length;
+}
+
+static int get_utf8_seq_length(const std::string& text, size_t pos)
+{
+	assert(pos < text.size());
+	return get_utf8_seq_length(text.c_str() + pos, text.size() - pos);
+}
+
 void NotificationManager::HintNotification::count_lines()
 {
 	std::string text = m_text1;
@@ -630,7 +700,7 @@ void NotificationManager::HintNotification::count_lines()
 					float width_of_a = ImGui::CalcTextSize("a").x;
 					int letter_count = (int)((m_window_width - m_window_width_offset) / width_of_a);
 					while (last_end + letter_count < text.size() && ImGui::CalcTextSize(text.substr(last_end, letter_count).c_str()).x < m_window_width - m_window_width_offset) {
-						//letter_count += get_utf8_sequence_length(text, last_end + letter_count);
+						letter_count += get_utf8_seq_length(text, last_end + letter_count);
 					}
 					m_endlines.push_back(last_end + letter_count);
 					last_end += letter_count;
@@ -702,7 +772,7 @@ void NotificationManager::HintNotification::count_lines()
 						float width_of_a = ImGui::CalcTextSize("a").x;
 						int letter_count = (int)((m_window_width - m_window_width_offset - size_of_last_line) / width_of_a);
 						while (last_end + letter_count < text.size() && ImGui::CalcTextSize(text.substr(last_end, letter_count).c_str()).x < m_window_width - m_window_width_offset - size_of_last_line) {
-							//letter_count += get_utf8_sequence_length(text, last_end + letter_count);
+							letter_count += get_utf8_seq_length(text, last_end + letter_count);
 						}
 						m_endlines2.push_back(last_end + letter_count);
 						last_end += letter_count;