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[fb] Fix fb log scrolling

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While working on the double-buffering issue, I ripped out this feature
from scrollback and didn't put it back in. Also having main allocate
extra space for the message buffer since calling malloc/free over again
several times was causing malloc to panic. (Which should also separately
be fixed..)
This commit is contained in:
Justin C. Miller
2021-02-06 00:33:45 -08:00
parent eb8a3c0e09
commit a65ecb157d
2 changed files with 7 additions and 3 deletions
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4
src/drivers/fb/main.cpp
View File

@@ -92,7 +92,7 @@ main(int argc, const char **argv)
scrollback scroll(rows, cols);
int pending = 0;
constexpr int pending_threshold = 10;
constexpr int pending_threshold = 5;
j6_handle_t sys = __handle_sys;
size_t buffer_size = 0;
@@ -104,7 +104,7 @@ main(int argc, const char **argv)
if (s == j6_err_insufficient) {
free(message_buffer);
message_buffer = malloc(size);
message_buffer = malloc(size * 2);
buffer_size = size;
continue;
} else if (s != j6_status_ok) {

6
src/drivers/fb/scrollback.cpp
View File

@@ -45,8 +45,12 @@ scrollback::render(screen &scr, font &fnt)
const unsigned xstride = (m_margin + fnt.width());
const unsigned ystride = (m_margin + fnt.height());
unsigned start = m_count <= m_rows ? 0 :
m_count % m_rows;
for (unsigned y = 0; y < m_rows; ++y) {
char *line = &m_data[y*m_cols];
unsigned i = (start + y) % m_rows;
char *line = &m_data[i*m_cols];
for (unsigned x = 0; x < m_cols; ++x) {
fnt.draw_glyph(scr, line[x], fg, bg, m_margin+x*xstride, m_margin+y*ystride);
}