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terminal: add screen renderer

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We don't want to expose the term_screen internals for rendering.
Therefore, provide an iterator that allows external renderers to draw
terminals.
This commit is contained in:
David Herrmann 2014-10-02 19:31:43 +02:00
parent 1bfa594cf2
commit be50221384
2 changed files with 78 additions and 0 deletions
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66
src/libsystemd-terminal/term-screen.c
View file

@ -3892,3 +3892,69 @@ int term_screen_set_answerback(term_screen *screen, const char *answerback) {
return 0;
}
int term_screen_draw(term_screen *screen,
int (*draw_fn) (term_screen *screen,
void *userdata,
unsigned int x,
unsigned int y,
const term_attr *attr,
const uint32_t *ch,
size_t n_ch,
unsigned int ch_width),
void *userdata,
uint64_t *fb_age) {
uint64_t cell_age, line_age, age = 0;
term_charbuf_t ch_buf;
const uint32_t *ch_str;
unsigned int i, j, cw;
term_page *page;
term_line *line;
term_cell *cell;
size_t ch_n;
int r;
assert(screen);
assert(draw_fn);
if (fb_age)
age = *fb_age;
page = screen->page;
for (j = 0; j < page->height; ++j) {
line = page->lines[j];
line_age = MAX(line->age, page->age);
for (i = 0; i < page->width; ++i) {
cell = &line->cells[i];
cell_age = MAX(cell->age, line_age);
if (age != 0 && cell_age <= age)
continue;
ch_str = term_char_resolve(cell->ch, &ch_n, &ch_buf);
/* Character-width of 0 is used for cleared cells.
* Always treat this as single-cell character, so
* renderers can assume ch_width is set properpy. */
cw = MAX(cell->cwidth, 1U);
r = draw_fn(screen,
userdata,
i,
j,
&cell->attr,
ch_str,
ch_n,
cw);
if (r != 0)
return r;
}
}
if (fb_age)
*fb_age = screen->age++;
return 0;
}

12
src/libsystemd-terminal/term.h
View file

@ -147,3 +147,15 @@ void term_screen_soft_reset(term_screen *screen);
void term_screen_hard_reset(term_screen *screen);
int term_screen_set_answerback(term_screen *screen, const char *answerback);
int term_screen_draw(term_screen *screen,
int (*draw_fn) (term_screen *screen,
void *userdata,
unsigned int x,
unsigned int y,
const term_attr *attr,
const uint32_t *ch,
size_t n_ch,
unsigned int ch_width),
void *userdata,
uint64_t *fb_age);