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#include "vterm.h"
#include <camellia/execbuf.h>
#include <camellia/syscalls.h>
#include <string.h>
struct framebuf fb;
handle_t fb_fd;
struct rect dirty;
void dirty_mark(uint32_t x, uint32_t y) {
if (dirty.x1 > x) dirty.x1 = x;
if (dirty.x2 < x) dirty.x2 = x;
if (dirty.y1 > y) dirty.y1 = y;
if (dirty.y2 < y) dirty.y2 = y;
}
static void flush_combined(struct rect pix) {
size_t low = fb.pitch * pix.y1 + 4 * pix.x1;
size_t high = fb.pitch * pix.y2 + 4 * pix.y2 + 4;
_syscall_write(fb_fd, fb.b + low, high - low, low, 0);
}
static void flush_split(struct rect pix) {
static uint64_t execbuf[EXECBUF_MAX_LEN / sizeof(uint64_t)];
if (7 * (pix.y2 - pix.y1) * sizeof(uint64_t) >= sizeof execbuf) {
flush_combined(pix);
return;
}
size_t epos = 0;
for (uint32_t y = pix.y1; y < pix.y2; y++) {
size_t low = fb.pitch * y + 4 * pix.x1;
size_t high = fb.pitch * y + 4 * pix.x2 + 4;
execbuf[epos++] = EXECBUF_SYSCALL;
execbuf[epos++] = _SYSCALL_WRITE;
execbuf[epos++] = fb_fd;
execbuf[epos++] = fb.b + low;
execbuf[epos++] = high - low;
execbuf[epos++] = low;
execbuf[epos++] = 0;
}
_syscall_execbuf(execbuf, epos * sizeof(uint64_t));
}
void flush(void) {
if (~dirty.x1 == 0) return;
struct rect pix;
pix.x1 = dirty.x1 * font.w;
pix.x2 = dirty.x2 * font.w + font.w - 1;
pix.y1 = dirty.y1 * font.h;
pix.y2 = dirty.y2 * font.h + font.h - 1;
if (pix.x2 >= fb.width) pix.x2 = fb.width - 1;
if (pix.y2 >= fb.height) pix.y2 = fb.height - 1;
/* the threshold is mostly arbitrary, wasn't based on any real benchmarks */
if (pix.x2 - pix.x1 > fb.width - 600) flush_combined(pix);
else flush_split(pix);
dirty.x1 = ~0; dirty.y1 = ~0;
dirty.x2 = 0; dirty.y2 = 0;
}
void scroll(void) {
// TODO memmove. this is UD
size_t row_len = fb.pitch * font.h;
memcpy(fb.b, fb.b + row_len, fb.len - row_len);
memset(fb.b + fb.len - row_len, 0, row_len);
cursor.y--;
dirty.x1 = 0; dirty.y1 = 0;
dirty.x2 = ~0; dirty.y2 = ~0;
}
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