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Recognise color tags and style them appropriately #26

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Recognise color tags and style them appropriately #26

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49caacc
Recognise color tags and style them appropriately
hikari-no-yume Nov 3, 2020
817c59e
Match Soramimi color tag parsing exactly
hikari-no-yume Nov 12, 2020
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65 changes: 63 additions & 2 deletions hibikase/LineTimingDecorations.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
#include <chrono>
#include <cstdlib>
#include <memory>
#include <cctype>

#include <QBrush>
#include <QColor>
Expand All @@ -25,6 +26,7 @@
#include <QPen>
#include <QPoint>
#include <QRect>
#include <QRegularExpression>
#include <QTextCursor>
#include <QTextDocument>
#include <QWidget>
Expand Down Expand Up @@ -74,20 +76,24 @@ static QColor GetPlayedColor()
return col;
}

static void SetColor(QTextDocument* document, int start_index, int end_index, TimingState state)
static void UpdateTextCharFormat(QTextDocument* document, int start_index, int end_index, QTextCharFormat modifier)
{
QTextCursor cursor(document);
cursor.setPosition(start_index, QTextCursor::MoveAnchor);
cursor.setPosition(end_index, QTextCursor::KeepAnchor);
cursor.mergeCharFormat(modifier);
}

static void SetColor(QTextDocument* document, int start_index, int end_index, TimingState state)
{
QTextCharFormat color;
if (state == TimingState::NotPlayed)
color.setForeground(GetNotPlayedColor());
else if (state == TimingState::Playing)
color.setForeground(GetPlayingColor());
else
color.setForeground(GetPlayedColor());
cursor.setCharFormat(color);
UpdateTextCharFormat(document, start_index, end_index, color);
}

SyllableDecorations::SyllableDecorations(const QPlainTextEdit* text_edit, int start_index,
Expand Down Expand Up @@ -182,10 +188,65 @@ void SyllableDecorations::CalculateGeometry()
setGeometry(QRect(left, top, width, height));
}

static void FindAndStyleColorTags(QTextDocument* document, QString line, int start_index)
{
// Soramimi splits the lyrics into lines, then on each line matches tags
// beginning with < and ending with >, lower-cases the content, and uses
// strtok(, " ,\t\n<>=\"") to tokenise the attributes within.
// The first character (e.g. #) of the color code is ignored. There must be
// at least 6 remaining characters, and the first 6 are interpreted as hex.

#define SEP " ,\t=\"" // <>\n are excluded because they can't exist within a tag
#define REQUIRED_GAP "[" SEP "]+"
#define OPTIONAL_GAP "[" SEP "]*"
#define ANY_CHAR "[^" SEP "]"
static QRegularExpression REGEX(
"<" OPTIONAL_GAP
"font" REQUIRED_GAP
"color" REQUIRED_GAP
ANY_CHAR "(" ANY_CHAR "{6})" ANY_CHAR "*" OPTIONAL_GAP
">",
QRegularExpression::CaseInsensitiveOption);
#undef SEP
#undef REQUIRED_GAP
#undef OPTIONAL_GAP
#undef ANY_CHAR

for (QRegularExpressionMatchIterator it = REGEX.globalMatch(line); it.hasNext(); )
{
QRegularExpressionMatch m = it.next();

QString hex = m.captured(1);
int hex_start = start_index + m.capturedStart(1);
int hex_end = start_index + m.capturedEnd(1);

int channels[6] = {0};
for (unsigned i = 0; i < 6; i++)
{
int c = tolower(hex.data()[i].unicode());
const char HEX_DIGITS[] = "0123456789abcdef";
const char *pos = strchr(HEX_DIGITS, c);
if (!pos) // Soramimi treats non-hex digits as being zero
{
continue;
}
channels[i / 2] |= static_cast<int>((pos - HEX_DIGITS) << ((1 - (i & 1)) * 4));
}

QTextCharFormat format;
format.setFontFamily(QFontDatabase::systemFont(QFontDatabase::FixedFont).family());
format.setBackground(QColor(channels[0], channels[1], channels[2]));
format.setTextOutline(QPen(Qt::GlobalColor::gray));
UpdateTextCharFormat(document, hex_start, hex_end, format);
}
}

LineTimingDecorations::LineTimingDecorations(const KaraokeData::Line& line, int position,
QPlainTextEdit* text_edit, Milliseconds time, QObject* parent)
: QObject(parent), m_line(line), m_start_index(position)
{
FindAndStyleColorTags(text_edit->document(), m_line.GetText(), m_start_index);

m_state = GetTimingState(time, m_line.GetStart(), m_line.GetEnd());

const QVector<const KaraokeData::Syllable*> syllables = m_line.GetSyllables();
Expand Down