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mpv/libass/ass_parse.c

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/*
* Copyright (C) 2009 Grigori Goronzy <greg@geekmind.org>
*
* This file is part of libass.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "ass_render.h"
#include "ass_parse.h"
#define MAX_BE 127
#define NBSP 0xa0 // unicode non-breaking space character
#define skip_to(x) while ((*p != (x)) && (*p != '}') && (*p != 0)) { ++p;}
#define skip(x) if (*p == (x)) ++p; else { return p; }
#define skipopt(x) if (*p == (x)) { ++p; }
/**
* \brief Check if starting part of (*p) matches sample.
* If true, shift p to the first symbol after the matching part.
*/
static inline int mystrcmp(char **p, const char *sample)
{
int len = strlen(sample);
if (strncmp(*p, sample, len) == 0) {
(*p) += len;
return 1;
} else
return 0;
}
static void change_font_size(ASS_Renderer *render_priv, double sz)
{
double size = sz * render_priv->font_scale;
if (size < 1)
size = 1;
else if (size > render_priv->height * 2)
size = render_priv->height * 2;
ass_font_set_size(render_priv->state.font, size);
render_priv->state.font_size = sz;
}
/**
* \brief Change current font, using setting from render_priv->state.
*/
void update_font(ASS_Renderer *render_priv)
{
unsigned val;
ASS_FontDesc desc;
desc.family = strdup(render_priv->state.family);
desc.treat_family_as_pattern =
render_priv->state.treat_family_as_pattern;
val = render_priv->state.bold;
// 0 = normal, 1 = bold, >1 = exact weight
if (val == 1 || val == -1)
val = 200; // bold
else if (val <= 0)
val = 80; // normal
desc.bold = val;
val = render_priv->state.italic;
if (val == 1 || val == -1)
val = 110; // italic
else if (val <= 0)
val = 0; // normal
desc.italic = val;
render_priv->state.font =
ass_font_new(render_priv->cache.font_cache, render_priv->library,
render_priv->ftlibrary, render_priv->fontconfig_priv,
&desc);
free(desc.family);
if (render_priv->state.font)
change_font_size(render_priv, render_priv->state.font_size);
}
/**
* \brief Change border width
* negative value resets border to style value
*/
void change_border(ASS_Renderer *render_priv, double border_x,
double border_y)
{
int bord;
if (!render_priv->state.font)
return;
if (border_x < 0 && border_y < 0) {
if (render_priv->state.style->BorderStyle == 1 ||
render_priv->state.style->BorderStyle == 3)
border_x = border_y = render_priv->state.style->Outline;
else
border_x = border_y = 1.;
}
render_priv->state.border_x = border_x;
render_priv->state.border_y = border_y;
bord = 64 * border_x * render_priv->border_scale;
if (bord > 0 && border_x == border_y) {
if (!render_priv->state.stroker) {
int error;
error =
FT_Stroker_New(render_priv->ftlibrary,
&render_priv->state.stroker);
if (error) {
ass_msg(render_priv->library, MSGL_V,
"failed to get stroker");
render_priv->state.stroker = 0;
}
}
if (render_priv->state.stroker)
FT_Stroker_Set(render_priv->state.stroker, bord,
FT_STROKER_LINECAP_ROUND,
FT_STROKER_LINEJOIN_ROUND, 0);
} else {
FT_Stroker_Done(render_priv->state.stroker);
render_priv->state.stroker = 0;
}
}
/**
* \brief Calculate a weighted average of two colors
* calculates c1*(1-a) + c2*a, but separately for each component except alpha
*/
static void change_color(uint32_t *var, uint32_t new, double pwr)
{
(*var) = ((uint32_t) (_r(*var) * (1 - pwr) + _r(new) * pwr) << 24) +
((uint32_t) (_g(*var) * (1 - pwr) + _g(new) * pwr) << 16) +
((uint32_t) (_b(*var) * (1 - pwr) + _b(new) * pwr) << 8) + _a(*var);
}
// like change_color, but for alpha component only
inline void change_alpha(uint32_t *var, uint32_t new, double pwr)
{
*var =
(_r(*var) << 24) + (_g(*var) << 16) + (_b(*var) << 8) +
(uint32_t) (_a(*var) * (1 - pwr) + _a(new) * pwr);
}
/**
* \brief Multiply two alpha values
* \param a first value
* \param b second value
* \return result of multiplication
* Parameters and result are limited by 0xFF.
*/
inline uint32_t mult_alpha(uint32_t a, uint32_t b)
{
return 0xFF - (0xFF - a) * (0xFF - b) / 0xFF;
}
/**
* \brief Calculate alpha value by piecewise linear function
* Used for \fad, \fade implementation.
*/
static unsigned
interpolate_alpha(long long now, long long t1, long long t2, long long t3,
long long t4, unsigned a1, unsigned a2, unsigned a3)
{
unsigned a;
double cf;
if (now <= t1) {
a = a1;
} else if (now >= t4) {
a = a3;
} else if (now < t2) { // and > t1
cf = ((double) (now - t1)) / (t2 - t1);
a = a1 * (1 - cf) + a2 * cf;
} else if (now > t3) {
cf = ((double) (now - t3)) / (t4 - t3);
a = a2 * (1 - cf) + a3 * cf;
} else { // t2 <= now <= t3
a = a2;
}
return a;
}
/**
* Parse a vector clip into an outline, using the proper scaling
* parameters. Translate it to correct for screen borders, if needed.
*/
static char *parse_vector_clip(ASS_Renderer *render_priv, char *p)
{
int scale = 1;
int res = 0;
ASS_Drawing *drawing;
render_priv->state.clip_drawing = ass_drawing_new(
render_priv->fontconfig_priv,
render_priv->state.font,
render_priv->settings.hinting,
render_priv->ftlibrary);
drawing = render_priv->state.clip_drawing;
skipopt('(');
res = mystrtoi(&p, &scale);
skipopt(',')
if (!res)
scale = 1;
drawing->scale = scale;
drawing->scale_x = render_priv->font_scale_x * render_priv->font_scale;
drawing->scale_y = render_priv->font_scale;
while (*p != ')' && *p != '}' && p != 0)
ass_drawing_add_char(drawing, *p++);
skipopt(')');
if (ass_drawing_parse(drawing, 1)) {
// We need to translate the clip according to screen borders
if (render_priv->settings.left_margin != 0 ||
render_priv->settings.top_margin != 0) {
FT_Vector trans = {
.x = int_to_d6(render_priv->settings.left_margin),
.y = -int_to_d6(render_priv->settings.top_margin),
};
FT_Outline_Translate(&drawing->glyph->outline, trans.x, trans.y);
}
ass_msg(render_priv->library, MSGL_DBG2,
"Parsed vector clip: scale %d, scales (%f, %f) string [%s]\n",
scale, drawing->scale_x, drawing->scale_y, drawing->text);
}
return p;
}
/**
* \brief Parse style override tag.
* \param p string to parse
* \param pwr multiplier for some tag effects (comes from \t tags)
*/
static char *parse_tag(ASS_Renderer *render_priv, char *p, double pwr)
{
skip_to('\\');
skip('\\');
if ((*p == '}') || (*p == 0))
return p;
// New tags introduced in vsfilter 2.39
if (mystrcmp(&p, "xbord")) {
double val;
if (mystrtod(&p, &val))
val = render_priv->state.border_x * (1 - pwr) + val * pwr;
else
val = -1.;
change_border(render_priv, val, render_priv->state.border_y);
} else if (mystrcmp(&p, "ybord")) {
double val;
if (mystrtod(&p, &val))
val = render_priv->state.border_y * (1 - pwr) + val * pwr;
else
val = -1.;
change_border(render_priv, render_priv->state.border_x, val);
} else if (mystrcmp(&p, "xshad")) {
double val;
if (mystrtod(&p, &val))
val = render_priv->state.shadow_x * (1 - pwr) + val * pwr;
else
val = 0.;
render_priv->state.shadow_x = val;
} else if (mystrcmp(&p, "yshad")) {
double val;
if (mystrtod(&p, &val))
val = render_priv->state.shadow_y * (1 - pwr) + val * pwr;
else
val = 0.;
render_priv->state.shadow_y = val;
} else if (mystrcmp(&p, "fax")) {
double val;
if (mystrtod(&p, &val))
render_priv->state.fax =
val * pwr + render_priv->state.fax * (1 - pwr);
else
render_priv->state.fax = 0.;
} else if (mystrcmp(&p, "fay")) {
double val;
if (mystrtod(&p, &val))
render_priv->state.fay =
val * pwr + render_priv->state.fay * (1 - pwr);
else
render_priv->state.fay = 0.;
} else if (mystrcmp(&p, "iclip")) {
int x0, y0, x1, y1;
int res = 1;
char *start = p;
skipopt('(');
res &= mystrtoi(&p, &x0);
skipopt(',');
res &= mystrtoi(&p, &y0);
skipopt(',');
res &= mystrtoi(&p, &x1);
skipopt(',');
res &= mystrtoi(&p, &y1);
skipopt(')');
if (res) {
render_priv->state.clip_x0 =
render_priv->state.clip_x0 * (1 - pwr) + x0 * pwr;
render_priv->state.clip_x1 =
render_priv->state.clip_x1 * (1 - pwr) + x1 * pwr;
render_priv->state.clip_y0 =
render_priv->state.clip_y0 * (1 - pwr) + y0 * pwr;
render_priv->state.clip_y1 =
render_priv->state.clip_y1 * (1 - pwr) + y1 * pwr;
render_priv->state.clip_mode = 1;
} else if (!render_priv->state.clip_drawing) {
p = parse_vector_clip(render_priv, start);
render_priv->state.clip_drawing_mode = 1;
} else
render_priv->state.clip_mode = 0;
} else if (mystrcmp(&p, "blur")) {
double val;
if (mystrtod(&p, &val)) {
val = render_priv->state.blur * (1 - pwr) + val * pwr;
val = (val < 0) ? 0 : val;
val = (val > BLUR_MAX_RADIUS) ? BLUR_MAX_RADIUS : val;
render_priv->state.blur = val;
} else
render_priv->state.blur = 0.0;
// ASS standard tags
} else if (mystrcmp(&p, "fsc")) {
char tp = *p++;
double val;
if (tp == 'x') {
if (mystrtod(&p, &val)) {
val /= 100;
render_priv->state.scale_x =
render_priv->state.scale_x * (1 - pwr) + val * pwr;
} else
render_priv->state.scale_x =
render_priv->state.style->ScaleX;
} else if (tp == 'y') {
if (mystrtod(&p, &val)) {
val /= 100;
render_priv->state.scale_y =
render_priv->state.scale_y * (1 - pwr) + val * pwr;
} else
render_priv->state.scale_y =
render_priv->state.style->ScaleY;
}
} else if (mystrcmp(&p, "fsp")) {
double val;
if (mystrtod(&p, &val))
render_priv->state.hspacing =
render_priv->state.hspacing * (1 - pwr) + val * pwr;
else
render_priv->state.hspacing = render_priv->state.style->Spacing;
} else if (mystrcmp(&p, "fs")) {
double val;
if (mystrtod(&p, &val))
val = render_priv->state.font_size * (1 - pwr) + val * pwr;
else
val = render_priv->state.style->FontSize;
if (render_priv->state.font)
change_font_size(render_priv, val);
} else if (mystrcmp(&p, "bord")) {
double val;
if (mystrtod(&p, &val)) {
if (render_priv->state.border_x == render_priv->state.border_y)
val = render_priv->state.border_x * (1 - pwr) + val * pwr;
} else
val = -1.; // reset to default
change_border(render_priv, val, val);
} else if (mystrcmp(&p, "move")) {
double x1, x2, y1, y2;
long long t1, t2, delta_t, t;
double x, y;
double k;
skip('(');
mystrtod(&p, &x1);
skip(',');
mystrtod(&p, &y1);
skip(',');
mystrtod(&p, &x2);
skip(',');
mystrtod(&p, &y2);
if (*p == ',') {
skip(',');
mystrtoll(&p, &t1);
skip(',');
mystrtoll(&p, &t2);
ass_msg(render_priv->library, MSGL_DBG2,
"movement6: (%f, %f) -> (%f, %f), (%" PRId64 " .. %"
PRId64 ")\n", x1, y1, x2, y2, (int64_t) t1,
(int64_t) t2);
} else {
t1 = 0;
t2 = render_priv->state.event->Duration;
ass_msg(render_priv->library, MSGL_DBG2,
"movement: (%f, %f) -> (%f, %f)", x1, y1, x2, y2);
}
skip(')');
delta_t = t2 - t1;
t = render_priv->time - render_priv->state.event->Start;
if (t < t1)
k = 0.;
else if (t > t2)
k = 1.;
else
k = ((double) (t - t1)) / delta_t;
x = k * (x2 - x1) + x1;
y = k * (y2 - y1) + y1;
if (render_priv->state.evt_type != EVENT_POSITIONED) {
render_priv->state.pos_x = x;
render_priv->state.pos_y = y;
render_priv->state.detect_collisions = 0;
render_priv->state.evt_type = EVENT_POSITIONED;
}
} else if (mystrcmp(&p, "frx")) {
double val;
if (mystrtod(&p, &val)) {
val *= M_PI / 180;
render_priv->state.frx =
val * pwr + render_priv->state.frx * (1 - pwr);
} else
render_priv->state.frx = 0.;
} else if (mystrcmp(&p, "fry")) {
double val;
if (mystrtod(&p, &val)) {
val *= M_PI / 180;
render_priv->state.fry =
val * pwr + render_priv->state.fry * (1 - pwr);
} else
render_priv->state.fry = 0.;
} else if (mystrcmp(&p, "frz") || mystrcmp(&p, "fr")) {
double val;
if (mystrtod(&p, &val)) {
val *= M_PI / 180;
render_priv->state.frz =
val * pwr + render_priv->state.frz * (1 - pwr);
} else
render_priv->state.frz =
M_PI * render_priv->state.style->Angle / 180.;
} else if (mystrcmp(&p, "fn")) {
char *start = p;
char *family;
skip_to('\\');
if (p > start) {
family = malloc(p - start + 1);
strncpy(family, start, p - start);
family[p - start] = '\0';
} else
family = strdup(render_priv->state.style->FontName);
if (render_priv->state.family)
free(render_priv->state.family);
render_priv->state.family = family;
update_font(render_priv);
} else if (mystrcmp(&p, "alpha")) {
uint32_t val;
int i;
int hex = render_priv->track->track_type == TRACK_TYPE_ASS;
if (strtocolor(render_priv->library, &p, &val, hex)) {
unsigned char a = val >> 24;
for (i = 0; i < 4; ++i)
change_alpha(&render_priv->state.c[i], a, pwr);
} else {
change_alpha(&render_priv->state.c[0],
render_priv->state.style->PrimaryColour, pwr);
change_alpha(&render_priv->state.c[1],
render_priv->state.style->SecondaryColour, pwr);
change_alpha(&render_priv->state.c[2],
render_priv->state.style->OutlineColour, pwr);
change_alpha(&render_priv->state.c[3],
render_priv->state.style->BackColour, pwr);
}
// FIXME: simplify
} else if (mystrcmp(&p, "an")) {
int val;
if (mystrtoi(&p, &val) && val) {
int v = (val - 1) / 3; // 0, 1 or 2 for vertical alignment
ass_msg(render_priv->library, MSGL_DBG2, "an %d", val);
if (v != 0)
v = 3 - v;
val = ((val - 1) % 3) + 1; // horizontal alignment
val += v * 4;
ass_msg(render_priv->library, MSGL_DBG2, "align %d", val);
render_priv->state.alignment = val;
} else
render_priv->state.alignment =
render_priv->state.style->Alignment;
} else if (mystrcmp(&p, "a")) {
int val;
if (mystrtoi(&p, &val) && val)
// take care of a vsfilter quirk: handle illegal \a8 like \a5
render_priv->state.alignment = (val == 8) ? 5 : val;
else
render_priv->state.alignment =
render_priv->state.style->Alignment;
} else if (mystrcmp(&p, "pos")) {
double v1, v2;
skip('(');
mystrtod(&p, &v1);
skip(',');
mystrtod(&p, &v2);
skip(')');
ass_msg(render_priv->library, MSGL_DBG2, "pos(%f, %f)", v1, v2);
if (render_priv->state.evt_type == EVENT_POSITIONED) {
ass_msg(render_priv->library, MSGL_V, "Subtitle has a new \\pos "
"after \\move or \\pos, ignoring");
} else {
render_priv->state.evt_type = EVENT_POSITIONED;
render_priv->state.detect_collisions = 0;
render_priv->state.pos_x = v1;
render_priv->state.pos_y = v2;
}
} else if (mystrcmp(&p, "fad")) {
int a1, a2, a3;
long long t1, t2, t3, t4;
if (*p == 'e')
++p; // either \fad or \fade
skip('(');
mystrtoi(&p, &a1);
skip(',');
mystrtoi(&p, &a2);
if (*p == ')') {
// 2-argument version (\fad, according to specs)
// a1 and a2 are fade-in and fade-out durations
t1 = 0;
t4 = render_priv->state.event->Duration;
t2 = a1;
t3 = t4 - a2;
a1 = 0xFF;
a2 = 0;
a3 = 0xFF;
} else {
// 6-argument version (\fade)
// a1 and a2 (and a3) are opacity values
skip(',');
mystrtoi(&p, &a3);
skip(',');
mystrtoll(&p, &t1);
skip(',');
mystrtoll(&p, &t2);
skip(',');
mystrtoll(&p, &t3);
skip(',');
mystrtoll(&p, &t4);
}
skip(')');
render_priv->state.fade =
interpolate_alpha(render_priv->time -
render_priv->state.event->Start, t1, t2,
t3, t4, a1, a2, a3);
} else if (mystrcmp(&p, "org")) {
int v1, v2;
skip('(');
mystrtoi(&p, &v1);
skip(',');
mystrtoi(&p, &v2);
skip(')');
ass_msg(render_priv->library, MSGL_DBG2, "org(%d, %d)", v1, v2);
if (!render_priv->state.have_origin) {
render_priv->state.org_x = v1;
render_priv->state.org_y = v2;
render_priv->state.have_origin = 1;
render_priv->state.detect_collisions = 0;
}
} else if (mystrcmp(&p, "t")) {
double v[3];
int v1, v2;
double v3;
int cnt;
long long t1, t2, t, delta_t;
double k;
skip('(');
for (cnt = 0; cnt < 3; ++cnt) {
if (*p == '\\')
break;
v[cnt] = strtod(p, &p);
skip(',');
}
if (cnt == 3) {
v1 = v[0];
v2 = (v[1] < v1) ? render_priv->state.event->Duration : v[1];
v3 = v[2];
} else if (cnt == 2) {
v1 = v[0];
v2 = (v[1] < v1) ? render_priv->state.event->Duration : v[1];
v3 = 1.;
} else if (cnt == 1) {
v1 = 0;
v2 = render_priv->state.event->Duration;
v3 = v[0];
} else { // cnt == 0
v1 = 0;
v2 = render_priv->state.event->Duration;
v3 = 1.;
}
render_priv->state.detect_collisions = 0;
t1 = v1;
t2 = v2;
delta_t = v2 - v1;
if (v3 < 0.)
v3 = 0.;
t = render_priv->time - render_priv->state.event->Start; // FIXME: move to render_context
if (t <= t1)
k = 0.;
else if (t >= t2)
k = 1.;
else {
assert(delta_t != 0.);
k = pow(((double) (t - t1)) / delta_t, v3);
}
while (*p == '\\')
p = parse_tag(render_priv, p, k); // maybe k*pwr ? no, specs forbid nested \t's
skip_to(')'); // in case there is some unknown tag or a comment
skip(')');
} else if (mystrcmp(&p, "clip")) {
char *start = p;
int x0, y0, x1, y1;
int res = 1;
skipopt('(');
res &= mystrtoi(&p, &x0);
skipopt(',');
res &= mystrtoi(&p, &y0);
skipopt(',');
res &= mystrtoi(&p, &x1);
skipopt(',');
res &= mystrtoi(&p, &y1);
skipopt(')');
if (res) {
render_priv->state.clip_x0 =
render_priv->state.clip_x0 * (1 - pwr) + x0 * pwr;
render_priv->state.clip_x1 =
render_priv->state.clip_x1 * (1 - pwr) + x1 * pwr;
render_priv->state.clip_y0 =
render_priv->state.clip_y0 * (1 - pwr) + y0 * pwr;
render_priv->state.clip_y1 =
render_priv->state.clip_y1 * (1 - pwr) + y1 * pwr;
// Might be a vector clip
} else if (!render_priv->state.clip_drawing) {
p = parse_vector_clip(render_priv, start);
render_priv->state.clip_drawing_mode = 0;
} else {
render_priv->state.clip_x0 = 0;
render_priv->state.clip_y0 = 0;
render_priv->state.clip_x1 = render_priv->track->PlayResX;
render_priv->state.clip_y1 = render_priv->track->PlayResY;
}
} else if (mystrcmp(&p, "c")) {
uint32_t val;
int hex = render_priv->track->track_type == TRACK_TYPE_ASS;
if (!strtocolor(render_priv->library, &p, &val, hex))
val = render_priv->state.style->PrimaryColour;
ass_msg(render_priv->library, MSGL_DBG2, "color: %X", val);
change_color(&render_priv->state.c[0], val, pwr);
} else if ((*p >= '1') && (*p <= '4') && (++p)
&& (mystrcmp(&p, "c") || mystrcmp(&p, "a"))) {
char n = *(p - 2);
int cidx = n - '1';
char cmd = *(p - 1);
uint32_t val;
int hex = render_priv->track->track_type == TRACK_TYPE_ASS;
assert((n >= '1') && (n <= '4'));
if (!strtocolor(render_priv->library, &p, &val, hex))
switch (n) {
case '1':
val = render_priv->state.style->PrimaryColour;
break;
case '2':
val = render_priv->state.style->SecondaryColour;
break;
case '3':
val = render_priv->state.style->OutlineColour;
break;
case '4':
val = render_priv->state.style->BackColour;
break;
default:
val = 0;
break; // impossible due to assert; avoid compilation warning
}
switch (cmd) {
case 'c':
change_color(render_priv->state.c + cidx, val, pwr);
break;
case 'a':
change_alpha(render_priv->state.c + cidx, val >> 24, pwr);
break;
default:
ass_msg(render_priv->library, MSGL_WARN, "Bad command: %c%c",
n, cmd);
break;
}
ass_msg(render_priv->library, MSGL_DBG2, "single c/a at %f: %c%c = %X",
pwr, n, cmd, render_priv->state.c[cidx]);
} else if (mystrcmp(&p, "r")) {
reset_render_context(render_priv);
} else if (mystrcmp(&p, "be")) {
int val;
if (mystrtoi(&p, &val)) {
// Clamp to a safe upper limit, since high values need excessive CPU
val = (val < 0) ? 0 : val;
val = (val > MAX_BE) ? MAX_BE : val;
render_priv->state.be = val;
} else
render_priv->state.be = 0;
} else if (mystrcmp(&p, "b")) {
int b;
if (mystrtoi(&p, &b)) {
if (pwr >= .5)
render_priv->state.bold = b;
} else
render_priv->state.bold = render_priv->state.style->Bold;
update_font(render_priv);
} else if (mystrcmp(&p, "i")) {
int i;
if (mystrtoi(&p, &i)) {
if (pwr >= .5)
render_priv->state.italic = i;
} else
render_priv->state.italic = render_priv->state.style->Italic;
update_font(render_priv);
} else if (mystrcmp(&p, "kf") || mystrcmp(&p, "K")) {
int val = 0;
mystrtoi(&p, &val);
render_priv->state.effect_type = EF_KARAOKE_KF;
if (render_priv->state.effect_timing)
render_priv->state.effect_skip_timing +=
render_priv->state.effect_timing;
render_priv->state.effect_timing = val * 10;
} else if (mystrcmp(&p, "ko")) {
int val = 0;
mystrtoi(&p, &val);
render_priv->state.effect_type = EF_KARAOKE_KO;
if (render_priv->state.effect_timing)
render_priv->state.effect_skip_timing +=
render_priv->state.effect_timing;
render_priv->state.effect_timing = val * 10;
} else if (mystrcmp(&p, "k")) {
int val = 0;
mystrtoi(&p, &val);
render_priv->state.effect_type = EF_KARAOKE;
if (render_priv->state.effect_timing)
render_priv->state.effect_skip_timing +=
render_priv->state.effect_timing;
render_priv->state.effect_timing = val * 10;
} else if (mystrcmp(&p, "shad")) {
double val;
if (mystrtod(&p, &val)) {
if (render_priv->state.shadow_x == render_priv->state.shadow_y)
val = render_priv->state.shadow_x * (1 - pwr) + val * pwr;
} else
val = 0.;
render_priv->state.shadow_x = render_priv->state.shadow_y = val;
} else if (mystrcmp(&p, "s")) {
int val;
if (mystrtoi(&p, &val) && val)
render_priv->state.flags |= DECO_STRIKETHROUGH;
else
render_priv->state.flags &= ~DECO_STRIKETHROUGH;
} else if (mystrcmp(&p, "u")) {
int val;
if (mystrtoi(&p, &val) && val)
render_priv->state.flags |= DECO_UNDERLINE;
else
render_priv->state.flags &= ~DECO_UNDERLINE;
} else if (mystrcmp(&p, "pbo")) {
double val = 0;
if (mystrtod(&p, &val))
render_priv->state.drawing->pbo = val;
} else if (mystrcmp(&p, "p")) {
int val;
if (!mystrtoi(&p, &val))
val = 0;
if (val)
render_priv->state.drawing->scale = val;
render_priv->state.drawing_mode = !!val;
} else if (mystrcmp(&p, "q")) {
int val;
if (!mystrtoi(&p, &val))
val = render_priv->track->WrapStyle;
render_priv->state.wrap_style = val;
}
return p;
}
void apply_transition_effects(ASS_Renderer *render_priv, ASS_Event *event)
{
int v[4];
int cnt;
char *p = event->Effect;
if (!p || !*p)
return;
cnt = 0;
while (cnt < 4 && (p = strchr(p, ';'))) {
v[cnt++] = atoi(++p);
}
if (strncmp(event->Effect, "Banner;", 7) == 0) {
int delay;
if (cnt < 1) {
ass_msg(render_priv->library, MSGL_V,
"Error parsing effect: '%s'", event->Effect);
return;
}
if (cnt >= 2 && v[1] == 0) // right-to-left
render_priv->state.scroll_direction = SCROLL_RL;
else // left-to-right
render_priv->state.scroll_direction = SCROLL_LR;
delay = v[0];
if (delay == 0)
delay = 1; // ?
render_priv->state.scroll_shift =
(render_priv->time - render_priv->state.event->Start) / delay;
render_priv->state.evt_type = EVENT_HSCROLL;
return;
}
if (strncmp(event->Effect, "Scroll up;", 10) == 0) {
render_priv->state.scroll_direction = SCROLL_BT;
} else if (strncmp(event->Effect, "Scroll down;", 12) == 0) {
render_priv->state.scroll_direction = SCROLL_TB;
} else {
ass_msg(render_priv->library, MSGL_V,
"Unknown transition effect: '%s'", event->Effect);
return;
}
// parse scroll up/down parameters
{
int delay;
int y0, y1;
if (cnt < 3) {
ass_msg(render_priv->library, MSGL_V,
"Error parsing effect: '%s'", event->Effect);
return;
}
delay = v[2];
if (delay == 0)
delay = 1; // ?
render_priv->state.scroll_shift =
(render_priv->time - render_priv->state.event->Start) / delay;
if (v[0] < v[1]) {
y0 = v[0];
y1 = v[1];
} else {
y0 = v[1];
y1 = v[0];
}
if (y1 == 0)
y1 = render_priv->track->PlayResY; // y0=y1=0 means fullscreen scrolling
render_priv->state.clip_y0 = y0;
render_priv->state.clip_y1 = y1;
render_priv->state.evt_type = EVENT_VSCROLL;
render_priv->state.detect_collisions = 0;
}
}
/**
* \brief Get next ucs4 char from string, parsing and executing style overrides
* \param str string pointer
* \return ucs4 code of the next char
* On return str points to the unparsed part of the string
*/
unsigned get_next_char(ASS_Renderer *render_priv, char **str)
{
char *p = *str;
unsigned chr;
if (*p == '{') { // '\0' goes here
p++;
while (1) {
p = parse_tag(render_priv, p, 1.);
if (*p == '}') { // end of tag
p++;
if (*p == '{') {
p++;
continue;
} else
break;
} else if (*p != '\\')
ass_msg(render_priv->library, MSGL_V,
"Unable to parse: '%s'", p);
if (*p == 0)
break;
}
}
if (*p == '\t') {
++p;
*str = p;
return ' ';
}
if (*p == '\\') {
if ((p[1] == 'N') || ((p[1] == 'n') &&
(render_priv->state.wrap_style == 2))) {
p += 2;
*str = p;
return '\n';
} else if (p[1] == 'n') {
p += 2;
*str = p;
return ' ';
} else if (p[1] == 'h') {
p += 2;
*str = p;
return NBSP;
}
}
chr = ass_utf8_get_char((char **) &p);
*str = p;
return chr;
}
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