Split decoder and render
decode.* will solely decode the teletext packets into a grid of characters and colours and other attributes stored in an agnostic way, then render.* will read this grid and render the characters onto the screen with the Qt specific methods.
This commit is contained in:
G.K.MacGregor
306
decode.h
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306
decode.h
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/*
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* Copyright (C) 2020-2022 Gavin MacGregor
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*
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* This file is part of QTeletextMaker.
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*
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* QTeletextMaker is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* QTeletextMaker is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with QTeletextMaker. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef DECODE_H
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#define DECODE_H
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#include <QMap>
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#include <QMultiMap>
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#include <QPair>
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#include <vector>
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#include "levelonepage.h"
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struct textCharacter {
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unsigned char code=0x20;
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int set=0;
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int diacritical=0;
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};
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inline bool operator!=(const textCharacter &lhs, const textCharacter &rhs)
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{
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return lhs.code != rhs.code ||
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lhs.set != rhs.set ||
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lhs.diacritical != rhs.diacritical;
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}
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struct displayAttributes {
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bool doubleHeight=false;
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bool doubleWidth=false;
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bool boxingWindow=false;
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bool conceal=false;
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bool invert=false;
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bool underlineSeparated=false;
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bool forceContiguous=false;
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};
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inline bool operator!=(const displayAttributes &lhs, const displayAttributes &rhs)
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{
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return lhs.doubleHeight != rhs.doubleHeight ||
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lhs.doubleWidth != rhs.doubleWidth ||
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lhs.boxingWindow != rhs.boxingWindow ||
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lhs.conceal != rhs.conceal ||
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lhs.invert != rhs.invert ||
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lhs.underlineSeparated != rhs.underlineSeparated ||
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lhs.forceContiguous != rhs.forceContiguous;
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}
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struct textAttributes {
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int foreColour=0x07;
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int backColour=0x00;
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struct flashFunctions {
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int mode=0;
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int ratePhase=0;
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int phaseNumber=0;
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} flash;
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displayAttributes display;
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/* font style */
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};
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inline bool operator!=(const textAttributes &lhs, const textAttributes &rhs)
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{
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return lhs.foreColour != rhs.foreColour ||
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lhs.backColour != rhs.backColour ||
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lhs.flash.mode != rhs.flash.mode ||
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lhs.flash.ratePhase != rhs.flash.ratePhase ||
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lhs.flash.phaseNumber != rhs.flash.phaseNumber ||
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lhs.display != rhs.display;
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}
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struct textCell {
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textCharacter character;
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textAttributes attribute;
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bool bottomHalf=false;
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bool rightHalf=false;
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bool level1Mosaic=false;
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int level1CharSet=0;
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};
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inline bool operator!=(const textCell &lhs, const textCell &rhs)
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{
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return lhs.character != rhs.character ||
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lhs.attribute != rhs.attribute ||
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lhs.bottomHalf != rhs.bottomHalf ||
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lhs.rightHalf != rhs.rightHalf ||
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lhs.level1Mosaic != rhs.level1Mosaic ||
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lhs.level1CharSet != rhs.level1CharSet;
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}
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struct applyAttributes {
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bool applyForeColour=false;
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bool applyBackColour=false;
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bool applyFlash=false;
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bool applyDisplayAttributes=false;
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bool applyTextSizeOnly=false;
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bool applyBoxingOnly=false;
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bool applyConcealOnly=false;
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bool applyContiguousOnly=false;
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bool copyAboveAttributes=false;
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textAttributes attribute;
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};
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class ActivePosition
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{
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public:
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ActivePosition();
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int row() const { return (m_row == -1) ? 0 : m_row; }
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int column() const { return (m_column == -1) ? 0 : m_column; }
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bool isDeployed() const { return m_row != -1; }
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bool setRow(int);
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bool setColumn(int);
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// bool setRowAndColumn(int, int);
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private:
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int m_row, m_column;
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};
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class TextLayer
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{
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public:
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// TextLayer(TeletextPage* thePage) : currentPage(thePage) { };
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virtual ~TextLayer() = default;
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void setTeletextPage(LevelOnePage *);
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virtual textCharacter character(int, int) =0;
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virtual void attributes(int, int, applyAttributes *) =0;
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virtual int fullScreenColour() const =0;
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virtual int fullRowColour(int) const =0;
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virtual bool fullRowDownwards(int) const =0;
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virtual int objectType() const =0;
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virtual int originR() const { return 0; };
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virtual int originC() const { return 0; };
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void setFullScreenColour(int);
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void setFullRowColour(int, int, bool);
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// Key QPair is row and column, value QPair is triplet mode and data
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QMultiMap<QPair<int, int>, QPair<int, int>> enhanceMap;
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protected:
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LevelOnePage* m_levelOnePage;
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int m_layerFullScreenColour=-1;
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int m_layerFullRowColour[25];
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bool m_layerFullRowDownwards[25];
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applyAttributes m_applyAttributes;
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};
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class EnhanceLayer: public TextLayer
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{
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public:
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EnhanceLayer();
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textCharacter character(int, int);
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void attributes(int, int, applyAttributes *);
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int fullScreenColour() const { return m_layerFullScreenColour; };
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int fullRowColour(int r) const { return m_layerFullRowColour[r]; };
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bool fullRowDownwards(int r) const { return m_layerFullRowDownwards[r]; };
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int objectType() const { return m_objectType; };
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int originR() const { return m_originR; };
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int originC() const { return m_originC; };
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void setObjectType(int);
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void setOrigin(int, int);
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protected:
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int m_objectType=0;
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int m_originR=0;
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int m_originC=0;
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int m_rowCached=-1;
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int m_rightMostColumn[25];
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};
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class Level1Layer: public TextLayer
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{
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public:
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enum RowHeight { Normal=-1, TopHalf, BottomHalf };
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// Level1Layer(TeletextPage *thePage) : TextLayer(thePage) { };
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Level1Layer();
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textCharacter character(int, int);
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void attributes(int, int, applyAttributes *);
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int fullScreenColour() const { return -1; };
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int fullRowColour(int) const { return -1; };
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bool fullRowDownwards(int) const { return false; };
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int objectType() const { return 0; }
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RowHeight rowHeight(int r) const { return m_rowHeight[r]; };
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private:
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void updateRowCache(int);
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struct level1CacheAttributes {
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int foreColour=0x07;
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int backColour=0x00;
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unsigned char sizeCode=0x0c;
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bool mosaics=false;
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bool separated=false;
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bool held=false;
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bool escSwitch=false;
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unsigned char holdChar=0x20;
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bool holdSeparated=false;
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};
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level1CacheAttributes m_attributeCache[40];
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int m_rowCached=-1;
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bool m_rowHasDoubleHeightAttr[25];
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RowHeight m_rowHeight[25];
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};
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class TeletextPageDecode : public QObject
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{
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Q_OBJECT
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public:
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enum CharacterFragment { NormalSize, DoubleHeightTopHalf, DoubleHeightBottomHalf, DoubleWidthLeftHalf, DoubleWidthRightHalf, DoubleSizeTopLeftQuarter, DoubleSizeTopRightQuarter, DoubleSizeBottomLeftQuarter, DoubleSizeBottomRightQuarter };
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TeletextPageDecode();
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~TeletextPageDecode();
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bool refresh(int r, int c) const { return m_refresh[r][c]; }
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void setRefresh(int, int, bool);
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void decodePage();
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void decodeRow(int r);
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LevelOnePage *teletextPage() const { return m_levelOnePage; };
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void setTeletextPage(LevelOnePage *);
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void updateSidePanels();
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void buildEnhanceMap(TextLayer *, int=0);
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unsigned char cellCharacterCode(int r, int c) { return cellAtCharacterOrigin(r, c).character.code; };
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int cellCharacterSet(int r, int c) { return cellAtCharacterOrigin(r, c).character.set; };
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int cellCharacterDiacritical(int r, int c) { return cellAtCharacterOrigin(r, c).character.diacritical; };
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int cellForegroundCLUT(int r, int c) { return cellAtCharacterOrigin(r, c).attribute.foreColour; };
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int cellBackgroundCLUT(int r, int c) { return cellAtCharacterOrigin(r, c).attribute.backColour; };
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QColor cellForegroundQColor(int, int);
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QColor cellBackgroundQColor(int, int);
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QColor cellFlashForegroundQColor(int, int);
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int cellFlashMode(int r, int c) { return cellAtCharacterOrigin(r, c).attribute.flash.mode; };
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int cellFlashRatePhase(int r, int c) { return cellAtCharacterOrigin(r, c).attribute.flash.ratePhase; };
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int cellFlash2HzPhaseNumber(int r, int c) { return cellAtCharacterOrigin(r, c).attribute.flash.phaseNumber; };
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CharacterFragment cellCharacterFragment(int, int) const;
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bool cellBoxed(int r, int c) { return cellAtCharacterOrigin(r, c).attribute.display.boxingWindow; };
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bool cellConceal(int r, int c) { return cellAtCharacterOrigin(r, c).attribute.display.conceal; };
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bool cellUnderlined(int r, int c) { return cellAtCharacterOrigin(r, c).attribute.display.underlineSeparated && cellAtCharacterOrigin(r, c).character.set < 24; };
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bool level1MosaicAttribute(int r, int c) const { return m_cell[r][c].level1Mosaic; };
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int level1CharSet(int r, int c) const { return m_cell[r][c].level1CharSet; };
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QColor fullScreenQColor() const { return m_finalFullScreenQColor; };
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QColor fullRowQColor(int r) const { return m_fullRowQColor[r]; };
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int leftSidePanelColumns() const { return m_leftSidePanelColumns; };
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int rightSidePanelColumns() const { return m_rightSidePanelColumns; };
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public slots:
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void setRenderLevel(int);
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signals:
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void fullScreenColourChanged(QColor);
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void fullRowColourChanged(int, QColor);
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void sidePanelsChanged();
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protected:
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inline void setFullScreenColour(int);
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inline void setFullRowColour(int, int);
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textCell& cellAtCharacterOrigin(int, int);
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int m_finalFullScreenColour, m_renderLevel;
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QColor m_finalFullScreenQColor;
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int m_leftSidePanelColumns, m_rightSidePanelColumns;
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Level1Layer m_level1Layer;
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std::vector<TextLayer *> m_textLayer;
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const int m_foregroundRemap[8] = { 0, 0, 0, 8, 8, 16, 16, 16 };
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const int m_backgroundRemap[8] = { 0, 8, 16, 8, 16, 8, 16, 24 };
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private:
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enum ColourPart { Foreground, Background, FlashForeground };
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QColor cellQColor(int, int, ColourPart);
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textCell m_cell[25][72];
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bool m_refresh[25][72];
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LevelOnePage* m_levelOnePage;
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int m_fullRowColour[25];
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QColor m_fullRowQColor[25];
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};
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static const QMap<int, int> g0CharacterMap {
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{ 0x00, 12 }, { 0x01, 15 }, { 0x02, 22 }, { 0x03, 16 }, { 0x04, 14 }, { 0x05, 19 }, { 0x06, 11 },
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{ 0x08, 18 }, { 0x09, 15 }, { 0x0a, 22 }, { 0x0b, 16 }, { 0x0c, 14 }, { 0x0e, 11 },
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{ 0x10, 12 }, { 0x11, 15 }, { 0x12, 22 }, { 0x13, 16 }, { 0x14, 14 }, { 0x15, 19 }, { 0x16, 23 },
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{ 0x1d, 21 }, { 0x1f, 20 },
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{ 0x20, 1 }, { 0x21, 15 }, { 0x22, 13 }, { 0x23, 17 }, { 0x24, 2 }, { 0x25, 3 }, { 0x26, 11 },
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{ 0x36, 23 }, { 0x37, 4 },
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{ 0x40, 12 }, { 0x44, 14 }, { 0x47, 5 },
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{ 0x55, 6 }, { 0x57, 5 }
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};
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#endif
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