Optimise rendering of pages with flashing characters
Previously every character on the page was drawn up to six times. Now the page is drawn once, quickly copied up to five times and then only the flashing characters are redrawn on the copies.
This commit is contained in:
G.K.MacGregor
397
render.cpp
397
render.cpp
@@ -55,9 +55,11 @@ TeletextPageRender::TeletextPageRender()
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m_showControlCodes = false;
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m_flashBuffersHz = 0;
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for (int r=0; r<25; r++)
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for (int r=0; r<25; r++) {
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m_flashingRow[r] = 0;
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for (int c=0; c<40; c++)
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m_controlCodeCache[r][c] = 0x7f;
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}
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}
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TeletextPageRender::~TeletextPageRender()
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@@ -182,224 +184,201 @@ inline void TeletextPageRender::drawCharacter(QPainter &pixmapPainter, int r, in
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void TeletextPageRender::renderPage(bool force)
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{
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QPainter pixmapPainter[6];
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int previousFlashBuffersHz = m_flashBuffersHz;
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// If force-rendering (such as showing a new or different subpage) then
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// we don't render flashing cells initially as it greatly speeds things up
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// when rendering on top of an already flashing page.
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// At the end of this method, if flashing cells are present then this method
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// recursively calls itself with force=false to render the flashing cells.
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if (force) {
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m_flashBuffersHz = 0;
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previousFlashBuffersHz = 0;
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emit flashChanged(0);
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}
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pixmapPainter[0].begin(m_pagePixmap[0]);
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pixmapPainter[0].setBackgroundMode(Qt::OpaqueMode);
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if (m_flashBuffersHz != 0) {
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pixmapPainter[3].begin(m_pagePixmap[3]);
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pixmapPainter[3].setBackgroundMode(Qt::OpaqueMode);
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if (m_flashBuffersHz == 2) {
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pixmapPainter[1].begin(m_pagePixmap[1]);
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pixmapPainter[1].setBackgroundMode(Qt::OpaqueMode);
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pixmapPainter[2].begin(m_pagePixmap[2]);
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pixmapPainter[2].setBackgroundMode(Qt::OpaqueMode);
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pixmapPainter[4].begin(m_pagePixmap[4]);
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pixmapPainter[4].setBackgroundMode(Qt::OpaqueMode);
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pixmapPainter[5].begin(m_pagePixmap[5]);
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pixmapPainter[5].setBackgroundMode(Qt::OpaqueMode);
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}
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}
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for (int r=0; r<25; r++)
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for (int c=0; c<72; c++) {
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bool controlCodeChanged = false;
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// Ensure that shown control codes are refreshed
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if (m_showControlCodes && c < 40 && (m_controlCodeCache[r][c] != 0x7f || m_decoder->teletextPage()->character(r, c) < 0x20)) {
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controlCodeChanged = m_controlCodeCache[r][c] != m_decoder->teletextPage()->character(r, c);
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if (controlCodeChanged) {
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if (m_decoder->teletextPage()->character(r, c) < 0x20)
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m_controlCodeCache[r][c] = m_decoder->teletextPage()->character(r, c);
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else
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m_controlCodeCache[r][c] = 0x7f;
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}
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}
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if (m_decoder->refresh(r, c) || force || controlCodeChanged) {
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unsigned char characterCode;
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int characterSet, characterDiacritical;
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if (!m_reveal && m_decoder->cellConceal(r, c)) {
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characterCode = 0x20;
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characterSet = 0;
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characterDiacritical = 0;
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} else {
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characterCode = m_decoder->cellCharacterCode(r, c);
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characterSet = m_decoder->cellCharacterSet(r, c);
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characterDiacritical = m_decoder->cellCharacterDiacritical(r, c);
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}
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// QSet::insert won't insert a duplicate value already in the set
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// QSet::remove doesn't mind if we try to remove a value that's not there
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if (m_flashBuffersHz == 0 && m_decoder->cellFlashMode(r, c) != 0) {
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if (m_decoder->cellFlashRatePhase(r, c) == 0)
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m_flash1HzCells.insert(qMakePair(r, c));
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else
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m_flash2HzCells.insert(qMakePair(r, c));
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if (!force)
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updateFlashBuffers();
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} else if (m_decoder->cellFlashMode(r, c) == 0) {
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m_flash1HzCells.remove(qMakePair(r, c));
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m_flash2HzCells.remove(qMakePair(r, c));
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if (!force)
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updateFlashBuffers();
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} else if (m_decoder->cellFlashRatePhase(r, c) == 0) {
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m_flash1HzCells.insert(qMakePair(r, c));
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m_flash2HzCells.remove(qMakePair(r, c));
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if (!force)
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updateFlashBuffers();
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} else {
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m_flash1HzCells.remove(qMakePair(r, c));
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m_flash2HzCells.insert(qMakePair(r, c));
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if (!force)
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updateFlashBuffers();
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}
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// If flash rate has gone up, prepare painters for the other buffers
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if (m_flashBuffersHz > previousFlashBuffersHz) {
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if (previousFlashBuffersHz == 0) {
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pixmapPainter[3].begin(m_pagePixmap[3]);
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pixmapPainter[3].setBackgroundMode(Qt::OpaqueMode);
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}
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if (m_flashBuffersHz == 2) {
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pixmapPainter[1].begin(m_pagePixmap[1]);
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pixmapPainter[1].setBackgroundMode(Qt::OpaqueMode);
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pixmapPainter[2].begin(m_pagePixmap[2]);
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pixmapPainter[2].setBackgroundMode(Qt::OpaqueMode);
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pixmapPainter[4].begin(m_pagePixmap[4]);
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pixmapPainter[4].setBackgroundMode(Qt::OpaqueMode);
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pixmapPainter[5].begin(m_pagePixmap[5]);
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pixmapPainter[5].setBackgroundMode(Qt::OpaqueMode);
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}
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previousFlashBuffersHz = m_flashBuffersHz;
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}
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// If flash rate has gone down, end the painters so we don't crash
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// if the pixmaps get copied due to the flash rate going up again
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if (m_flashBuffersHz < previousFlashBuffersHz) {
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if (previousFlashBuffersHz == 2) {
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pixmapPainter[1].end();
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pixmapPainter[2].end();
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pixmapPainter[4].end();
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pixmapPainter[5].end();
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}
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if (m_flashBuffersHz == 0)
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pixmapPainter[3].end();
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previousFlashBuffersHz = m_flashBuffersHz;
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}
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if (m_flashBuffersHz == 0) {
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pixmapPainter[0].setPen(m_decoder->cellForegroundQColor(r, c));
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if (!m_mix || m_decoder->cellBoxed(r, c))
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pixmapPainter[0].setBackground(m_decoder->cellBackgroundQColor(r, c));
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else
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pixmapPainter[0].setBackground(Qt::transparent);
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drawCharacter(pixmapPainter[0], r, c, characterCode, characterSet, characterDiacritical, m_decoder->cellCharacterFragment(r, c));
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} else {
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for (int i=0; i<6; i++) {
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if (m_flashBuffersHz == 1 && (i == 1 || i == 2 || i == 4 || i == 5))
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continue;
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bool phaseOn;
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if (m_decoder->cellFlashRatePhase(r, c) == 0)
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phaseOn = (i < 3) ^ (m_decoder->cellFlashMode(r, c) == 2);
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else
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phaseOn = ((i == m_decoder->cellFlash2HzPhaseNumber(r, c)-1) || (i == m_decoder->cellFlash2HzPhaseNumber(r, c)+2)) ^ (m_decoder->cellFlashMode(r, c) == 2);
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if (!m_mix || m_decoder->cellBoxed(r, c))
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pixmapPainter[i].setBackground(m_decoder->cellBackgroundQColor(r, c));
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else
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pixmapPainter[i].setBackground(Qt::transparent);
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if (m_decoder->cellFlashMode(r, c) == 3 && !phaseOn)
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pixmapPainter[i].setPen(m_decoder->cellFlashForegroundQColor(r, c));
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else
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pixmapPainter[i].setPen(m_decoder->cellForegroundQColor(r, c));
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if ((m_decoder->cellFlashMode(r, c) == 1 || m_decoder->cellFlashMode(r, c) == 2) && !phaseOn)
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// Character 0x00 draws space without underline
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drawCharacter(pixmapPainter[i], r, c, 0x00, 0, 0, m_decoder->cellCharacterFragment(r, c));
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else
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drawCharacter(pixmapPainter[i], r, c, characterCode, characterSet, characterDiacritical, m_decoder->cellCharacterFragment(r, c));
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}
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}
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if (m_showControlCodes && c < 40 && m_decoder->teletextPage()->character(r, c) < 0x20) {
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pixmapPainter[0].setBackground(QColor(0, 0, 0, 128));
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pixmapPainter[0].setPen(QColor(255, 255, 255, 224));
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pixmapPainter[0].drawPixmap(c*12, r*10, *m_fontBitmap.rawBitmap(), (m_decoder->teletextPage()->character(r, c)+32)*12, 250, 12, 10);
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if (m_flashBuffersHz == 1) {
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pixmapPainter[3].setBackground(QColor(0, 0, 0, 128));
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pixmapPainter[3].setPen(QColor(255, 255, 255, 224));
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pixmapPainter[3].drawPixmap(c*12, r*10, *m_fontBitmap.rawBitmap(), (m_decoder->teletextPage()->character(r, c)+32)*12, 250, 12, 10);
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} else if (m_flashBuffersHz == 2)
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for (int i=1; i<6; i++) {
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pixmapPainter[i].setBackground(QColor(0, 0, 0, 128));
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pixmapPainter[i].setPen(QColor(255, 255, 255, 224));
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pixmapPainter[i].drawPixmap(c*12, r*10, *m_fontBitmap.rawBitmap(), (m_decoder->teletextPage()->character(r, c)+32)*12, 250, 12, 10);
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}
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}
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if (force && m_decoder->cellFlashMode(r, c) != 0)
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m_decoder->setRefresh(r, c, true);
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else
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m_decoder->setRefresh(r, c, false);
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}
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}
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pixmapPainter[0].end();
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if (m_flashBuffersHz != 0) {
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pixmapPainter[3].end();
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if (m_flashBuffersHz == 2) {
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pixmapPainter[1].end();
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pixmapPainter[2].end();
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pixmapPainter[4].end();
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pixmapPainter[5].end();
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}
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}
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if (force && (!m_flash1HzCells.isEmpty() || !m_flash2HzCells.isEmpty()))
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renderPage();
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renderRow(r, 0, force);
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}
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void TeletextPageRender::updateFlashBuffers()
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void TeletextPageRender::renderRow(int r, int ph, bool force)
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{
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int highestFlashHz;
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QPainter pixmapPainter;
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int flashingRow = 0;
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bool rowRefreshed = false;
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if (!m_flash2HzCells.isEmpty())
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highestFlashHz = 2;
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else
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highestFlashHz = !m_flash1HzCells.isEmpty();
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pixmapPainter.begin(m_pagePixmap[ph]);
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pixmapPainter.setBackgroundMode(Qt::OpaqueMode);
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if (highestFlashHz == m_flashBuffersHz)
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return;
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for (int c=0; c<72; c++) {
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bool controlCodeChanged = false;
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if (highestFlashHz > m_flashBuffersHz) {
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if (m_flashBuffersHz == 0)
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*m_pagePixmap[3] = m_pagePixmap[0]->copy();
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if (highestFlashHz == 2) {
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*m_pagePixmap[1] = m_pagePixmap[0]->copy();
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*m_pagePixmap[2] = m_pagePixmap[0]->copy();
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*m_pagePixmap[4] = m_pagePixmap[3]->copy();
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*m_pagePixmap[5] = m_pagePixmap[3]->copy();
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// Ensure that shown control codes are refreshed
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if (ph == 0 && m_showControlCodes && c < 40 && (m_controlCodeCache[r][c] != 0x7f || m_decoder->teletextPage()->character(r, c) < 0x20)) {
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controlCodeChanged = m_controlCodeCache[r][c] != m_decoder->teletextPage()->character(r, c);
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if (controlCodeChanged) {
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if (m_decoder->teletextPage()->character(r, c) < 0x20)
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m_controlCodeCache[r][c] = m_decoder->teletextPage()->character(r, c);
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else
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m_controlCodeCache[r][c] = 0x7f;
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}
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}
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if (ph == 0) {
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if (m_decoder->cellFlashMode(r, c) != 0)
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flashingRow = (m_decoder->cellFlashRatePhase(r, c) == 0) ? 1 : 2;
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} else
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force = m_decoder->cellFlashMode(r, c) != 0;
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// If drawing into a flash pixmap buffer, "force" is set on a flashing cell only
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// and since the refresh and controlCodeChanged variables will be false at this point
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// only flashing cells will be drawn
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if (m_decoder->refresh(r, c) || force || controlCodeChanged) {
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unsigned char characterCode;
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int characterSet, characterDiacritical;
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rowRefreshed = true;
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if (!m_reveal && m_decoder->cellConceal(r, c)) {
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characterCode = 0x20;
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characterSet = 0;
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characterDiacritical = 0;
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} else {
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characterCode = m_decoder->cellCharacterCode(r, c);
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characterSet = m_decoder->cellCharacterSet(r, c);
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characterDiacritical = m_decoder->cellCharacterDiacritical(r, c);
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}
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if (m_decoder->cellFlashMode(r, c) == 0)
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pixmapPainter.setPen(m_decoder->cellForegroundQColor(r, c));
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else {
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// Flashing cell, decide if phase in this cycle is on or off
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bool phaseOn;
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if (m_decoder->cellFlashRatePhase(r, c) == 0)
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phaseOn = (ph < 3) ^ (m_decoder->cellFlashMode(r, c) == 2);
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else
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phaseOn = ((ph == m_decoder->cellFlash2HzPhaseNumber(r, c)-1) || (ph == m_decoder->cellFlash2HzPhaseNumber(r, c)+2)) ^ (m_decoder->cellFlashMode(r, c) == 2);
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// If flashing to adjacent CLUT select the appropriate foreground colour
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if (m_decoder->cellFlashMode(r, c) == 3 && !phaseOn)
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pixmapPainter.setPen(m_decoder->cellFlashForegroundQColor(r, c));
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else
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pixmapPainter.setPen(m_decoder->cellForegroundQColor(r, c));
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// If flashing mode is Normal or Invert, draw a space instead of a character on phase
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if ((m_decoder->cellFlashMode(r, c) == 1 || m_decoder->cellFlashMode(r, c) == 2) && !phaseOn) {
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// Character 0x00 draws space without underline
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characterCode = 0x00;
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characterSet = 0;
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characterDiacritical = 0;
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}
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}
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if (!m_mix || m_decoder->cellBoxed(r, c))
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pixmapPainter.setBackground(m_decoder->cellBackgroundQColor(r, c));
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else
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pixmapPainter.setBackground(Qt::transparent);
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drawCharacter(pixmapPainter, r, c, characterCode, characterSet, characterDiacritical, m_decoder->cellCharacterFragment(r, c));
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if (m_showControlCodes && c < 40 && m_decoder->teletextPage()->character(r, c) < 0x20) {
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pixmapPainter.setBackground(QColor(0, 0, 0, 128));
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pixmapPainter.setPen(QColor(255, 255, 255, 224));
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pixmapPainter.drawPixmap(c*12, r*10, *m_fontBitmap.rawBitmap(), (m_decoder->teletextPage()->character(r, c)+32)*12, 250, 12, 10);
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}
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}
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}
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m_flashBuffersHz = highestFlashHz;
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pixmapPainter.end();
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if (ph != 0)
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return;
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if (flashingRow == 3)
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flashingRow = 2;
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if (flashingRow != m_flashingRow[r])
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setRowFlashStatus(r, flashingRow);
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for (int c=0; c<72; c++)
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m_decoder->setRefresh(r, c, false);
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// If row had changes rendered and flashing is present anywhere on the screen,
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// copy this rendered line into the other flash pixmap buffers and then re-render
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// the flashing cells in those buffers
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if (rowRefreshed && m_flashBuffersHz > 0) {
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pixmapPainter.begin(m_pagePixmap[3]);
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pixmapPainter.setCompositionMode(QPainter::CompositionMode_Clear);
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pixmapPainter.eraseRect(0, r*10, 864, 10);
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pixmapPainter.setCompositionMode(QPainter::CompositionMode_SourceOver);
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pixmapPainter.drawPixmap(0, r*10, *m_pagePixmap[0], 0, r*10, 864, 10);
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pixmapPainter.end();
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renderRow(r, 3);
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if (m_flashBuffersHz == 2) {
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pixmapPainter.begin(m_pagePixmap[1]);
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pixmapPainter.setCompositionMode(QPainter::CompositionMode_Clear);
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pixmapPainter.eraseRect(0, r*10, 864, 10);
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pixmapPainter.setCompositionMode(QPainter::CompositionMode_SourceOver);
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pixmapPainter.drawPixmap(0, r*10, *m_pagePixmap[0], 0, r*10, 864, 10);
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pixmapPainter.end();
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pixmapPainter.begin(m_pagePixmap[2]);
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pixmapPainter.setCompositionMode(QPainter::CompositionMode_Clear);
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pixmapPainter.eraseRect(0, r*10, 864, 10);
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pixmapPainter.setCompositionMode(QPainter::CompositionMode_SourceOver);
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pixmapPainter.drawPixmap(0, r*10, *m_pagePixmap[0], 0, r*10, 864, 10);
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pixmapPainter.end();
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pixmapPainter.begin(m_pagePixmap[4]);
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pixmapPainter.setCompositionMode(QPainter::CompositionMode_Clear);
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pixmapPainter.eraseRect(0, r*10, 864, 10);
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pixmapPainter.setCompositionMode(QPainter::CompositionMode_SourceOver);
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pixmapPainter.drawPixmap(0, r*10, *m_pagePixmap[3], 0, r*10, 864, 10);
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pixmapPainter.end();
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pixmapPainter.begin(m_pagePixmap[5]);
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pixmapPainter.setCompositionMode(QPainter::CompositionMode_Clear);
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pixmapPainter.eraseRect(0, r*10, 864, 10);
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pixmapPainter.setCompositionMode(QPainter::CompositionMode_SourceOver);
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pixmapPainter.drawPixmap(0, r*10, *m_pagePixmap[3], 0, r*10, 864, 10);
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pixmapPainter.end();
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renderRow(r, 1);
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renderRow(r, 2);
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renderRow(r, 4);
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renderRow(r, 5);
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}
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}
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}
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void TeletextPageRender::setRowFlashStatus(int r, int rowFlashHz)
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{
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m_flashingRow[r] = rowFlashHz;
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if (rowFlashHz == m_flashBuffersHz)
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return;
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if (rowFlashHz < m_flashBuffersHz) {
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// New flash Hz for this row is lower than the entire screen flash Hz
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// Check the other rows if they still need flashing at the current flash Hz
|
||||
// If not, reduce the screen flash Hz
|
||||
int highestRowFlashHz = rowFlashHz;
|
||||
|
||||
for (int ri=0; ri<25; ri++)
|
||||
if (m_flashingRow[ri] > highestRowFlashHz) {
|
||||
highestRowFlashHz = m_flashingRow[ri];
|
||||
if (highestRowFlashHz == 2)
|
||||
break;
|
||||
}
|
||||
|
||||
if (highestRowFlashHz > rowFlashHz)
|
||||
rowFlashHz = highestRowFlashHz;
|
||||
if (rowFlashHz == m_flashBuffersHz)
|
||||
return;
|
||||
|
||||
m_flashBuffersHz = rowFlashHz;
|
||||
emit flashChanged(m_flashBuffersHz);
|
||||
return;
|
||||
}
|
||||
|
||||
// If we get here, new flash Hz for this row is higher than the entire flash Hz
|
||||
// so prepare the pixmap flash buffers
|
||||
if (m_flashBuffersHz == 0)
|
||||
*m_pagePixmap[3] = m_pagePixmap[0]->copy();
|
||||
if (rowFlashHz == 2) {
|
||||
*m_pagePixmap[1] = m_pagePixmap[0]->copy();
|
||||
*m_pagePixmap[2] = m_pagePixmap[0]->copy();
|
||||
*m_pagePixmap[4] = m_pagePixmap[3]->copy();
|
||||
*m_pagePixmap[5] = m_pagePixmap[3]->copy();
|
||||
}
|
||||
|
||||
m_flashBuffersHz = rowFlashHz;
|
||||
emit flashChanged(m_flashBuffersHz);
|
||||
}
|
||||
|
||||
|
||||
Reference in New Issue
Block a user