Commit 585d5b48 authored by Laurent Aimar's avatar Laurent Aimar
Browse files

Added helpers to create text subpicture.

It creates a subpicture rendering text at the display size.
parent 1de20d44
struct subpicture_updater_sys_t {
char *text;
char *html;
int align;
int x;
int y;
bool is_fixed;
int fixed_width;
int fixed_height;
};
static int SubpictureTextValidate(subpicture_t *subpic,
bool has_src_changed, const video_format_t *fmt_src,
bool has_dst_changed, const video_format_t *fmt_dst,
mtime_t ts)
{
subpicture_updater_sys_t *sys = subpic->updater.p_sys;
VLC_UNUSED(fmt_src); VLC_UNUSED(fmt_dst); VLC_UNUSED(ts);
if (!has_src_changed && !has_dst_changed)
return VLC_SUCCESS;
if (!sys->is_fixed && subpic->b_absolute && subpic->p_region &&
subpic->i_original_picture_width > 0 &&
subpic->i_original_picture_height > 0) {
sys->is_fixed = true;
sys->x = subpic->p_region->i_x;
sys->y = subpic->p_region->i_y;
sys->fixed_width = subpic->i_original_picture_width;
sys->fixed_height = subpic->i_original_picture_height;
}
return VLC_EGENERIC;
}
static void SubpictureTextUpdate(subpicture_t *subpic,
const video_format_t *fmt_src,
const video_format_t *fmt_dst,
mtime_t ts)
{
subpicture_updater_sys_t *sys = subpic->updater.p_sys;
VLC_UNUSED(fmt_src); VLC_UNUSED(ts);
if (fmt_dst->i_sar_num <= 0 || fmt_dst->i_sar_den <= 0)
return;
subpic->i_original_picture_width = fmt_dst->i_width * fmt_dst->i_sar_num / fmt_dst->i_sar_den;
subpic->i_original_picture_height = fmt_dst->i_height;
video_format_t fmt;
video_format_Init(&fmt, VLC_CODEC_TEXT);
fmt.i_sar_num = 1;
fmt.i_sar_den = 1;
subpicture_region_t *r = subpic->p_region = subpicture_region_New(&fmt);
if (!r)
return;
r->psz_text = sys->text ? strdup(sys->text) : NULL;
r->psz_html = sys->html ? strdup(sys->html) : NULL;
r->i_align = sys->align;
if (!sys->is_fixed) {
const float margin_ratio = 0.04;
const int margin_h = margin_ratio * fmt_dst->i_visible_width;
const int margin_v = margin_ratio * fmt_dst->i_visible_height;
r->i_x = 0;
if (r->i_align & SUBPICTURE_ALIGN_LEFT)
r->i_x += margin_h + fmt_dst->i_x_offset;
else if (r->i_align & SUBPICTURE_ALIGN_RIGHT)
r->i_x += margin_h + fmt_dst->i_width - (fmt_dst->i_visible_width + fmt_dst->i_x_offset);
r->i_y = 0;
if (r->i_align & SUBPICTURE_ALIGN_TOP )
r->i_y += margin_v + fmt_dst->i_y_offset;
else if (r->i_align & SUBPICTURE_ALIGN_BOTTOM )
r->i_y += margin_v + fmt_dst->i_height - (fmt_dst->i_visible_height + fmt_dst->i_y_offset);
} else {
/* FIXME it doesn't adapt on crop settings changes */
r->i_x = sys->x * fmt_dst->i_width / sys->fixed_width;
r->i_y = sys->y * fmt_dst->i_height / sys->fixed_height;
}
}
static void SubpictureTextDestroy(subpicture_t *subpic)
{
subpicture_updater_sys_t *sys = subpic->updater.p_sys;
free(sys->text);
free(sys->html);
free(sys);
}
static inline subpicture_t *decoder_NewSubpictureText(decoder_t *decoder)
{
subpicture_updater_sys_t *sys = calloc(1, sizeof(*sys));
subpicture_updater_t updater = {
.pf_validate = SubpictureTextValidate,
.pf_update = SubpictureTextUpdate,
.pf_destroy = SubpictureTextDestroy,
.p_sys = sys,
};
subpicture_t *subpic = decoder_NewSubpicture(decoder, &updater);
if (!subpic)
free(sys);
return subpic;
}
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