88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
/*
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* Copyright (C) 2020-2025 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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#include <QByteArray>
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#include "drcspage.h"
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DRCSPage::DRCSPage(const PageBase &other)
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{
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for (int y=0; y<26; y++)
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if (other.packetExists(y))
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setPacket(y, other.packet(y));
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for (int y=26; y<29; y++)
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for (int d=0; d<16; d++)
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if (other.packetExists(y, d))
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setPacket(y, d, other.packet(y, d));
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for (int b=PageBase::C4ErasePage; b<=PageBase::C14NOS; b++)
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setControlBit(b, other.controlBit(b));
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}
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PageBase::PageFunctionEnum DRCSPage::pageFunction() const
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{
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return PFGlobalPOP;
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}
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int DRCSPage::drcsMode(int c) const
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{
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if (!packetExists(28, 3))
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return 0;
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const QByteArray pkt = packet(28, 3);
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// Some tricky bit juggling to extract 4 bits from part of a 6-bit triplet
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switch (c % 3) {
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case 0:
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return pkt.at(c/3*2 + 4) & 0xf;
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case 1:
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return ((pkt.at((c-1)/3*2 + 4) & 0x30) >> 4) | ((pkt.at((c-1)/3*2 + 5) & 0x3) << 2);
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case 2:
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return pkt.at(((c-2)/3*2 + 5) & 0x3f) >> 2;
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}
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return 0; // Won't get here; used to suppress a compiler warning
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}
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bool DRCSPage::ptu(int c, uchar *data) const
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{
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const int pktNo = (c+2)/2;
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if (!packetExists(pktNo))
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return false;
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const int start = c%2 * 20;
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// FIXME should we check all 20 D-bytes for SPACE instead of just the first D-byte?
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if (packet(pktNo).at(start) < 0x40)
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return false;
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if (data != nullptr) {
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const int end = start + 20;
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for (int i=start, j=0; i<end; i+=2, j+=2) {
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data[j] = ((packet(pktNo).at(i) & 0x3f) << 2) | ((packet(pktNo).at(i+1) & 0x30) >> 4);
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data[j+1] = (packet(pktNo).at(i+1) & 0x0f) << 4;
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}
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}
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return true;
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}
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