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Implement DRCS rendering

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External pages with DRCS definitions can be loaded using the options in the
"DRCS pages" submenu within the "View" menu. Two DRCS pages can be loaded,
one for Global DRCS definitions and the other for Normal DRCS definitions.

Level 2.5 mode 0 PTUs are fully supported.

Partial support for Level 3.5 mode 1, 2 and 3 PTUs. DCLUTs defined in X/28/1
on the main page are not yet implemented; the characters currently appear in
the default DCLUTs described in D.1.6 and D.2.2 of the ETSI spec.
This commit is contained in:
Gavin MacGregor
2025-06-09 18:57:16 +01:00
parent 519c961cff
commit e1ba67484f
8 changed files with 536 additions and 8 deletions
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26
src/qteletextdecoder/render.cpp
View File

@@ -191,6 +191,23 @@ inline void TeletextPageRender::drawCharacter(QPainter &painter, int r, int c, u
}
}
inline bool TeletextPageRender::drawDRCSCharacter(QPainter &painter, int r, int c, TeletextPageDecode::DRCSSource drcsSource, int drcsSubTable, int drcsChar, TeletextPageDecode::CharacterFragment characterFragment, bool flashPhOn)
{
QImage drcsImage = m_decoder->drcsImage(drcsSource, drcsSubTable, drcsChar, flashPhOn);
if (drcsImage.isNull())
return false;
if (drcsImage.format() == QImage::Format_Mono)
// mode 0 (12x10x1) returned here has no colours of its own
// so apply the foreground and background colours of the cell it appears in
drcsImage.setColorTable(QVector<QRgb>{m_backgroundQColor.rgba(), m_foregroundQColor.rgba()});
drawFromBitmap(painter, r, c, drcsImage, characterFragment);
return true;
}
inline void TeletextPageRender::drawBoldOrItalicCharacter(QPainter &painter, int r, int c, unsigned char characterCode, int characterSet, TeletextPageDecode::CharacterFragment characterFragment)
{
QImage styledImage = QImage(12, 10, QImage::Format_Mono);
@@ -306,7 +323,7 @@ void TeletextPageRender::renderRow(int r, int ph, bool force)
drawCharacter(painter, r, c, 0x00, 0, 0, m_decoder->cellCharacterFragment(r, c));
else if (concealed)
drawCharacter(painter, r, c, 0x20, 0, 0, m_decoder->cellCharacterFragment(r, c));
else
else if (m_decoder->cellDrcsSource(r, c) == TeletextPageDecode::NoDRCS || !drawDRCSCharacter(painter, r, c, m_decoder->cellDrcsSource(r, c), m_decoder->cellDrcsSubTable(r, c), m_decoder->cellDrcsCharacter(r, c), m_decoder->cellCharacterFragment(r, c), flashPhOn))
drawCharacter(painter, r, c, m_decoder->cellCharacterCode(r, c), m_decoder->cellCharacterSet(r, c), m_decoder->cellCharacterDiacritical(r, c), m_decoder->cellCharacterFragment(r, c));
if (m_showControlCodes && c < 40 && m_decoder->teletextPage()->character(r, c) < 0x20) {
@@ -422,6 +439,13 @@ void TeletextPageRender::colourChanged(int index)
if (m_decoder->cellFlashMode(r, c) == 3 && ((m_decoder->cellForegroundCLUT(r, c) ^ 8) == index || (m_decoder->cellForegroundCLUT(r, c) ^ 8) == 8))
m_decoder->setRefresh(r, c, true);
}
if (m_decoder->level() == 3)
// TODO don't refresh mode 0 DRCS
for (int r=0; r<25; r++)
for (int c=0; c<72; c++)
if (m_decoder->cellDrcsSource(r, c) != TeletextPageDecode::NoDRCS)
m_decoder->setRefresh(r, c, true);
}
void TeletextPageRender::setReveal(bool reveal)