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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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3
src/qteletextdecoder/render.h
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@@ -79,9 +79,10 @@ protected:
int m_flashingRow[25];
private:
inline void drawFromBitmap(QPainter &, int, int, const QImage, TeletextPageDecode::CharacterFragment);
inline void drawFromBitmap(QPainter &painter, int r, int c, const QImage image, TeletextPageDecode::CharacterFragment characterFragment);
inline void drawFromFontBitmap(QPainter &painter, int r, int c, unsigned char characterCode, int characterSet, TeletextPageDecode::CharacterFragment characterFragment);
inline void drawCharacter(QPainter &painter, int r, int c, unsigned char characterCode, int characterSet, int characterDiacritical, TeletextPageDecode::CharacterFragment characterFragment);
inline bool drawDRCSCharacter(QPainter &painter, int r, int c, TeletextPageDecode::DRCSSource drcsSource, int drcsSubTable, int drcsChar, TeletextPageDecode::CharacterFragment characterFragment, bool flashPhOn = true);
inline void drawBoldOrItalicCharacter(QPainter &painter, int r, int c, unsigned char characterCode, int characterSet, TeletextPageDecode::CharacterFragment characterFragment);
void renderRow(int r, int ph, bool force=false);
void setRowFlashStatus(int r, int rowFlashHz);