269324c553
A long overdue cleanup of the src/ tree. - Moved src/drivers to src/user because it contains more than drivers - Removed src/drivers/ahci because it's unused - will restore it when I make a real AHCI driver - Removed unused src/tools - Moved kernel.ld (the only used file under src/arch) to src/kernel for now, if/when there's a multi-platform effort that should be figured out as part of it - Removed the rest of the unused src/arch - Renamed 'fb' to 'drv.uefi_fb' and 'nulldrv' to 'testapp'
59 lines
1.2 KiB
C++
59 lines
1.2 KiB
C++
#include <stdlib.h>
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#include <string.h>
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#include "font.h"
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#include "screen.h"
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#include "scrollback.h"
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scrollback::scrollback(unsigned lines, unsigned cols, unsigned margin) :
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m_rows {lines},
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m_cols {cols},
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m_count {0},
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m_margin {margin}
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{
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m_data = reinterpret_cast<char*>(malloc(lines*cols));
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memset(m_data, ' ', lines*cols);
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}
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void
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scrollback::add_line(const char *line, size_t len)
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{
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unsigned i = m_count++ % m_rows;
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if (len > m_cols)
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len = m_cols;
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char *start = m_data + (i * m_cols);
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memcpy(start, line, len);
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if (len < m_cols)
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memset(start + len, ' ', m_cols - len);
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}
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char *
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scrollback::get_line(unsigned i)
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{
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unsigned line = (i + m_count) % m_rows;
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return &m_data[line*m_cols];
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}
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void
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scrollback::render(screen &scr, font &fnt)
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{
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screen::pixel_t fg = scr.color(0xb0, 0xb0, 0xb0);
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screen::pixel_t bg = scr.color(49, 79, 128);
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const unsigned xstride = (m_margin + fnt.width());
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const unsigned ystride = (m_margin + fnt.height());
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unsigned start = m_count <= m_rows ? 0 :
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m_count % m_rows;
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for (unsigned y = 0; y < m_rows; ++y) {
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unsigned i = (start + y) % m_rows;
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char *line = &m_data[i*m_cols];
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for (unsigned x = 0; x < m_cols; ++x) {
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fnt.draw_glyph(scr, line[x], fg, bg, m_margin+x*xstride, m_margin+y*ystride);
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}
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}
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}
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