43 lines
1.4 KiB
C++
Executable File
43 lines
1.4 KiB
C++
Executable File
#include "ScrollbackBuffer.h"
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// NOTE: I added this file
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void ScrollbackBuffer::put(CGA::cga_line_t* line) {
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CGA::cga_line_t* destination = (CGA::cga_line_t*)this->buffer + this->pos;
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mmem::memcpy<CGA::cga_line_t>(destination, line);
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this->pos = (this->pos + 1) % this->rows;
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}
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void ScrollbackBuffer::get(CGA::cga_line_t* destination, unsigned char page) const {
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if (page < 0 || page >= this->pages) {
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return;
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}
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// We reverse the pagenumber so page 0 is always the newest page
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unsigned char rpage = this->pages - page - 1;
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// Copy linewise because page may wrap around buffer borders
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unsigned int wrapline;
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for (unsigned int line = 0; line < (this->rows / this->pages); ++line) {
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wrapline = (this->pos + rpage * (this->rows / this->pages) + line) % this->rows;
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mmem::memcpy<CGA::cga_line_t>(destination + line, (CGA::cga_line_t*)this->buffer + wrapline);
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}
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}
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void ScrollbackBuffer::save_screen(CGA::cga_page_t* destination) const {
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mmem::memcpy<CGA::cga_page_t>(destination, this->pagebuffer);
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}
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void ScrollbackBuffer::restore_screen(CGA::cga_page_t* source) {
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mmem::memcpy<CGA::cga_page_t>(this->pagebuffer, source);
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}
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void ScrollbackBuffer::clear() {
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for (unsigned char page = 0; page < this->pages; ++page) {
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mmem::zero<CGA::cga_page_t>(this->buffer + page);
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}
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mmem::zero<CGA::cga_page_t>(this->pagebuffer);
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this->pos = 0;
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}
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