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Tweak flashing logic

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This commit is contained in:
Gavin MacGregor
2025-06-01 12:50:33 +01:00
parent 07c6eed3fe
commit 519c961cff
1 changed files with 13 additions and 26 deletions
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39
src/qteletextdecoder/render.cpp
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@@ -272,46 +272,26 @@ void TeletextPageRender::renderRow(int r, int ph, bool force)
// and since the refresh and controlCodeChanged variables will be false at this point
// only flashing cells will be drawn
if (m_decoder->refresh(r, c) || force || controlCodeChanged) {
unsigned char characterCode;
int characterSet, characterDiacritical;
bool flashPhOn = true; // Must remain "true" on non-flashing cell
const bool concealed = !m_reveal && m_decoder->cellConceal(r, c);
rowRefreshed = true;
if (!m_reveal && m_decoder->cellConceal(r, c)) {
characterCode = 0x20;
characterSet = 0;
characterDiacritical = 0;
} else {
characterCode = m_decoder->cellCharacterCode(r, c);
characterSet = m_decoder->cellCharacterSet(r, c);
characterDiacritical = m_decoder->cellCharacterDiacritical(r, c);
}
if (m_renderMode < RenderWhiteOnBlack) {
if (m_decoder->cellFlashMode(r, c) == 0)
m_foregroundQColor = m_decoder->cellForegroundQColor(r, c);
else {
// Flashing cell, decide if phase in this cycle is on or off
bool phaseOn;
if (m_decoder->cellFlashRatePhase(r, c) == 0)
phaseOn = (ph < 3) ^ (m_decoder->cellFlashMode(r, c) == 2);
flashPhOn = (ph < 3) ^ (m_decoder->cellFlashMode(r, c) == 2);
else
phaseOn = ((ph == m_decoder->cellFlash2HzPhaseNumber(r, c)-1) || (ph == m_decoder->cellFlash2HzPhaseNumber(r, c)+2)) ^ (m_decoder->cellFlashMode(r, c) == 2);
flashPhOn = ((ph == m_decoder->cellFlash2HzPhaseNumber(r, c)-1) || (ph == m_decoder->cellFlash2HzPhaseNumber(r, c)+2)) ^ (m_decoder->cellFlashMode(r, c) == 2);
// If flashing to adjacent CLUT select the appropriate foreground colour
if (m_decoder->cellFlashMode(r, c) == 3 && !phaseOn)
if (m_decoder->cellFlashMode(r, c) == 3 && !flashPhOn)
m_foregroundQColor = m_decoder->cellFlashForegroundQColor(r, c);
else
m_foregroundQColor = m_decoder->cellForegroundQColor(r, c);
// If flashing mode is Normal or Invert, draw a space instead of a character on phase
if ((m_decoder->cellFlashMode(r, c) == 1 || m_decoder->cellFlashMode(r, c) == 2) && !phaseOn) {
// Character 0x00 draws space without underline
characterCode = 0x00;
characterSet = 0;
characterDiacritical = 0;
}
}
if (m_renderMode != RenderMix || m_decoder->cellBoxed(r, c))
@@ -320,7 +300,14 @@ void TeletextPageRender::renderRow(int r, int ph, bool force)
m_backgroundQColor = Qt::transparent;
}
drawCharacter(painter, r, c, characterCode, characterSet, characterDiacritical, m_decoder->cellCharacterFragment(r, c));
if (((m_decoder->cellFlashMode(r, c) == 1 || m_decoder->cellFlashMode(r, c) == 2) && !flashPhOn))
// If flashing mode is Normal or Invert, draw a space instead of a character on phase
// Character 0x00 draws space without underline
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
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) {
painter.setCompositionMode(QPainter::CompositionMode_SourceOver);