1be929b9d5
Using a start and a count was redundant when we know how many lines are in the buffer already.
57 lines
1.2 KiB
C++
57 lines
1.2 KiB
C++
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "font.h"
|
|
#include "screen.h"
|
|
#include "scrollback.h"
|
|
|
|
scrollback::scrollback(unsigned lines, unsigned cols, unsigned margin) :
|
|
m_rows {lines},
|
|
m_cols {cols},
|
|
m_count {0},
|
|
m_margin {margin}
|
|
{
|
|
m_data = reinterpret_cast<char*>(malloc(lines*cols));
|
|
m_lines = reinterpret_cast<char**>(malloc(lines*sizeof(char*)));
|
|
for (unsigned i = 0; i < lines; ++i)
|
|
m_lines[i] = &m_data[i*cols];
|
|
|
|
memset(m_data, ' ', lines*cols);
|
|
}
|
|
|
|
void
|
|
scrollback::add_line(const char *line, size_t len)
|
|
{
|
|
unsigned i = m_count++ % m_rows;
|
|
|
|
if (len > m_cols)
|
|
len = m_cols;
|
|
|
|
memcpy(m_lines[i], line, len);
|
|
if (len < m_cols)
|
|
memset(m_lines[i]+len, ' ', m_cols - len);
|
|
}
|
|
|
|
char *
|
|
scrollback::get_line(unsigned i)
|
|
{
|
|
return m_lines[(i+m_count)%m_rows];
|
|
}
|
|
|
|
void
|
|
scrollback::render(screen &scr, font &fnt)
|
|
{
|
|
screen::pixel_t fg = scr.color(0xb0, 0xb0, 0xb0);
|
|
screen::pixel_t bg = scr.color(49, 79, 128);
|
|
|
|
const unsigned xstride = (m_margin + fnt.width());
|
|
const unsigned ystride = (m_margin + fnt.height());
|
|
|
|
for (unsigned y = 0; y < m_rows; ++y) {
|
|
char *line = get_line(y);
|
|
for (unsigned x = 0; x < m_cols; ++x) {
|
|
fnt.draw_glyph(scr, line[x], fg, bg, m_margin+x*xstride, m_margin+y*ystride);
|
|
}
|
|
}
|
|
}
|