christoph/lecture-operating-system-development
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BufferedCGA refactoring

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This commit is contained in:
churl
2022-05-17 17:50:19 +02:00
parent c1b7c4cb5b
commit 13c7d898ab
7 changed files with 78 additions and 67 deletions
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32
c_os/lib/ScrollbackBuffer.h
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@ -10,32 +10,32 @@
// The buffer dimensions must match with the destination dimensions
class ScrollbackBuffer {
private:
CGA::cga_line_t* buffer; // Circular buffer to store lines that left the screen
CGA::cga_page_t* buffer; // Circular buffer to store lines that left the screen
CGA::cga_page_t* pagebuffer; // Contains the current page separately from the scrollback.
// I thought this was easier since it also captures the little output
// generated before the scrollback buffer is initialized
// generated before the scrollback buffer is initialized by accident
// (but only if it's less than a page)
unsigned int current_linenumber;
CGA::cga_line_t* get_current_line() const; // Translate linenumber to memory location
void buffer_next_line(); // Moves the current_line one line forward
unsigned int pos;
public:
const unsigned int pageheight, // Number of lines per page
pages, // Number of pages in buffer
lines; // Total number of lines in buffer
const unsigned int pages; // Number of pages in buffer
const unsigned int rows; // Number of lines in buffer
ScrollbackBuffer(unsigned char width, unsigned char height, unsigned char pages)
: current_linenumber(0), pageheight(height), pages(pages), lines(height * pages) {
this->buffer = new CGA::cga_line_t[lines];
ScrollbackBuffer(unsigned char rows, unsigned char pages)
: pos(0), pages(pages), rows(rows * pages) {
this->buffer = new CGA::cga_page_t[pages];
this->pagebuffer = new CGA::cga_page_t;
this->clear(); // Null out the buffer so no crap gets displayed
}
~ScrollbackBuffer() {
delete[] this->buffer;
delete this->pagebuffer;
}
void line_to_buffer(CGA::cga_line_t* line);
void copy_page_from_buffer(CGA::cga_line_t* destination, unsigned char page) const;
void copy_page_from_pagebuffer(CGA::cga_page_t* destination) const;
void copy_page_to_pagebuffer(CGA::cga_page_t* source);
void put(CGA::cga_line_t* line);
void get(CGA::cga_line_t* destination, unsigned char page) const;
void copy_from_pagebuffer(CGA::cga_page_t* destination) const;
void copy_to_pagebuffer(CGA::cga_page_t* source);
void clear();
};