christoph/lecture-operating-system-development
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Buffered CGA refactor finish

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This commit is contained in:
churl
2022-05-20 16:15:43 +02:00
parent 80cbe0900d
commit 5e2196c898
5 changed files with 29 additions and 36 deletions
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13
c_os/devices/BufferedCGA.cc
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@ -4,8 +4,14 @@
// NOTE: This has to be called when memorymanagement is active
void BufferedCGA::init(unsigned int pages) {
this->scrollback_buffer = new ScrollbackBuffer(ROWS, pages);
this->initialized = true;
this->screen_buffer = new CGA::cga_page_t;
if (this->scrollback_buffer == NULL || this->screen_buffer == NULL) {
this->print("\nError initializing scrollback buffer\n\n", 39);
return;
}
this->initialized = true;
this->print("\nInitialized scrollback buffer\n\n", 32);
}
@ -13,7 +19,7 @@ void BufferedCGA::display_scrollback() {
if (this->initialized) {
if (this->scrollback == 0) {
// Use pagebuffer
this->scrollback_buffer->save_screen((cga_page_t*)CGA_START);
mmem::memcpy<CGA::cga_page_t>((CGA::cga_page_t*)CGA_START, this->screen_buffer);
} else {
// Use scrollback
this->scrollback_buffer->get((cga_line_t*)CGA_START, this->scrollback - 1);
@ -50,6 +56,7 @@ void BufferedCGA::clear() {
if (this->initialized) {
this->scrollback_buffer->clear();
mmem::zero<CGA::cga_page_t>(this->screen_buffer);
} else {
this->print("ScrollbackBuffer not initialized\n\n", 34);
}
@ -60,7 +67,7 @@ void BufferedCGA::scroll_page_backward() {
// If this is the first scrollback we have to save the current screen content
if (this->scrollback == 0) {
this->scrollback_buffer->restore_screen((cga_page_t*)CGA_START);
mmem::memcpy<CGA::cga_page_t>(this->screen_buffer, (CGA::cga_page_t*)CGA_START);
}
// current_page can be equal to scrollback_buffer->pages