95 lines
2.8 KiB
C++
Executable File
95 lines
2.8 KiB
C++
Executable File
#include "BufferedCGA.h"
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// Can't initialize in constructor as memory management already needs working CGA for output
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// NOTE: This has to be called when memorymanagement is active
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void BufferedCGA::init(unsigned int pages) {
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this->scrollback_buffer = new ScrollbackBuffer(ROWS, pages); // No delete since it's only off when shutting the os down
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this->screen_buffer = new CGA::cga_page_t;
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if (this->scrollback_buffer == NULL || this->screen_buffer == NULL) {
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this->print("Error initializing scrollback buffer\n", 39);
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return;
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}
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this->initialized = true;
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this->print("Initialized scrollback buffer\n", 32);
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}
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void BufferedCGA::display_scrollback() {
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if (this->initialized) {
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if (this->scrollback == 0) {
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// Use pagebuffer
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mmem::memcpy<CGA::cga_page_t>((CGA::cga_page_t*)CGA_START, this->screen_buffer);
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} else {
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// Use scrollback
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this->scrollback_buffer->get((cga_line_t*)CGA_START, this->scrollback - 1);
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}
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} else {
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this->print("ScrollbackBuffer not initialized\n", 34);
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}
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}
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void BufferedCGA::print(char* string, int n, unsigned char attrib) {
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if (this->scrollback != 0) {
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// Display newest content from buffer when new prints happen
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this->scrollback = 0;
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this->display_scrollback();
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}
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CGA::print(string, n, attrib);
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}
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void BufferedCGA::scrollup() {
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if (this->initialized) {
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this->scrollback_buffer->put((cga_line_t*)CGA_START);
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} else {
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this->print("ScrollbackBuffer not initialized\n", 34);
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}
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CGA::scrollup();
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}
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void BufferedCGA::clear() {
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CGA::clear();
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this->scrollback = 0;
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if (this->initialized) {
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this->scrollback_buffer->clear();
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mmem::zero<CGA::cga_page_t>(this->screen_buffer);
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} else {
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this->print("ScrollbackBuffer not initialized\n", 34);
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}
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}
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void BufferedCGA::scroll_page_backward() {
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if (this->initialized) {
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// If this is the first scrollback we have to save the current screen content
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if (this->scrollback == 0) {
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mmem::memcpy<CGA::cga_page_t>(this->screen_buffer, (CGA::cga_page_t*)CGA_START);
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}
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// current_page can be equal to scrollback_buffer->pages
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// as we have a separate pagebuffer for the current screen content
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if (this->scrollback < this->scrollback_buffer->pages) {
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this->scrollback = this->scrollback + 1;
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}
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this->display_scrollback();
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} else {
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this->print("ScrollbackBuffer not initialized\n", 34);
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}
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}
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void BufferedCGA::scroll_page_forward() {
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if (this->initialized) {
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if (this->scrollback > 0) {
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this->scrollback = this->scrollback - 1;
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}
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this->display_scrollback();
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} else {
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this->print("ScrollbackBuffer not initialized\n", 34);
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}
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}
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