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mpv/libass/ass_render.c

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#include "config.h"
#include <assert.h>
#include <math.h>
#include <stdint.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_STROKER_H
#include FT_GLYPH_H
#include FT_SYNTHESIS_H
#include "mp_msg.h"
#include "ass.h"
#include "ass_cache.h"
#include "ass_utils.h"
#include "ass_fontconfig.h"
#include "libvo/sub.h" // for utf8_get_char
#define MAX_GLYPHS 1000
#define MAX_LINES 100
char *get_path(char *);
extern char *font_name;
#ifdef HAVE_FONTCONFIG
extern int font_fontconfig;
#else
static int font_fontconfig = 0;
#endif
struct ass_instance_s {
FT_Library library;
fc_instance_t* fontconfig_priv;
ass_settings_t settings;
ass_image_t* images_root; // rendering result is stored here
int n_images;
int max_images;
};
int no_more_font_messages = 0; // don't print font warnings
typedef enum {EF_NONE = 0, EF_KARAOKE, EF_KARAOKE_KF, EF_KARAOKE_KO} effect_t;
// describes a glyph
// glyph_info_t and text_info_t are used for text centering and word-wrapping operations
typedef struct glyph_info_s {
unsigned symbol;
FT_Glyph glyph;
FT_Glyph outline_glyph;
FT_BBox bbox;
FT_Vector pos;
char linebreak; // the first (leading) glyph of some line ?
uint32_t c1, c2, c3, c4; // colors
char bitmap; // bool
FT_Vector advance; // 26.6
effect_t effect_type;
int effect_timing;
int asc, desc; // font max ascender and descender
// int height;
glyph_hash_key_t hash_key;
} glyph_info_t;
typedef struct line_info_s {
int asc, desc;
} line_info_t;
typedef struct text_info_s {
glyph_info_t* glyphs;
int length;
line_info_t lines[MAX_LINES];
int n_lines;
int height;
} text_info_t;
// Renderer state.
// Values like current font face, color, screen position, clipping and so on are stored here.
typedef struct render_context_s {
ass_event_t* event;
ass_style_t* style;
FT_Face face;
char* font_path;
int font_size;
FT_Stroker stroker;
int alignment; // alignment overrides go here; if zero, style value will be used
double rotation;
enum { EVENT_NORMAL, // "normal" top-, sub- or mid- title
EVENT_POSITIONED // happens after pos(,), margins are ignored
} evt_type;
int pos_x, pos_y; // position
int org_x, org_y; // origin
double scale_x, scale_y;
int hspacing; // distance between letters, in pixels
double border; // outline width
uint32_t c1, c2, c3, c4; // colors(Primary, Secondary, so on) in RGBA
int clip_x0, clip_y0, clip_x1, clip_y1;
char detect_collisions;
effect_t effect_type;
int effect_timing;
// face properties
char* family;
unsigned bold;
unsigned italic;
} render_context_t;
// frame-global data
typedef struct frame_context_s {
ass_instance_t* ass_priv;
int width, height; // screen dimensions
int orig_height; // frame height ( = screen height - margins )
ass_track_t* track;
int add_bottom_margin; // additional margin, used to shift subtitles in case of collision
int add_top_margin;
long long time; // frame's timestamp, ms
double font_scale_x; // x scale applied to all glyphs to preserve text aspect ratio
} frame_context_t;
static ass_instance_t* ass_instance;
static ass_settings_t* global_settings;
static text_info_t text_info;
static render_context_t render_context;
static frame_context_t frame_context;
static void ass_lazy_track_init(void)
{
ass_track_t* track = frame_context.track;
if (track->PlayResX && track->PlayResY)
return;
if (!track->PlayResX && !track->PlayResY) {
mp_msg(MSGT_GLOBAL, MSGL_WARN, "Neither PlayResX nor PlayResY defined. Assuming 384x288. \n");
track->PlayResX = 384;
track->PlayResY = 288;
} else {
double orig_aspect = (global_settings->aspect * frame_context.height) / frame_context.orig_height;
if (!track->PlayResY) {
track->PlayResY = track->PlayResX / orig_aspect + .5;
mp_msg(MSGT_GLOBAL, MSGL_WARN, "PlayResY undefined, setting %d \n", track->PlayResY);
} else if (!track->PlayResX) {
track->PlayResX = track->PlayResY * orig_aspect + .5;
mp_msg(MSGT_GLOBAL, MSGL_WARN, "PlayResX undefined, setting %d \n", track->PlayResX);
}
}
}
ass_instance_t* ass_init(void)
{
char* family = 0;
char* path = 0;
char* fonts_path = 0;
int error;
fc_instance_t* fc_priv;
FT_Library ft;
ass_instance_t* priv;
if (font_fontconfig && font_name)
family = strdup(font_name);
if (!font_fontconfig && font_name)
path = strdup(font_name);
else
path = get_path("subfont.ttf");
fonts_path = get_path("fonts");
fc_priv = fontconfig_init(fonts_path, family, path);
free(fonts_path);
if (path) free(path);
if (family) free(family);
if (!fc_priv)
return 0;
error = FT_Init_FreeType( &ft );
if ( error ) {
mp_msg(MSGT_GLOBAL, MSGL_FATAL, "FT_Init_FreeType failed\n");
fontconfig_done(fc_priv);
return 0;
}
priv = calloc(1, sizeof(ass_instance_t));
if (!priv) {
FT_Done_FreeType(ft);
fontconfig_done(fc_priv);
return 0;
}
priv->library = ft;
priv->fontconfig_priv = fc_priv;
// images_root and related stuff is zero-filled in calloc
ass_face_cache_init();
ass_glyph_cache_init();
text_info.glyphs = calloc(MAX_GLYPHS, sizeof(glyph_info_t));
return priv;
}
void ass_done(ass_instance_t* priv)
{
ass_face_cache_done();
ass_glyph_cache_done();
if (priv && priv->library) FT_Done_FreeType(priv->library);
if (priv && priv->fontconfig_priv) fontconfig_done(priv->fontconfig_priv);
if (priv) free(priv);
if (text_info.glyphs) free(text_info.glyphs);
}
/**
* \brief Create a new ass_image_t and append it to images_root
* Parameters are the same as ass_image_t fields.
*/
static void my_draw_bitmap(unsigned char* bitmap, int bitmap_w, int bitmap_h, int stride, int dst_x, int dst_y, uint32_t color)
{
ass_instance_t* priv = ass_instance;
ass_image_t* img;
assert(priv->n_images <= priv->max_images);
if (priv->n_images == priv->max_images) {
if (!priv->max_images) priv->max_images = 100;
else priv->max_images *= 2;
priv->images_root = (ass_image_t*)realloc(priv->images_root, priv->max_images * sizeof(ass_image_t));
}
assert(priv->images_root);
img = priv->images_root + priv->n_images;
img->w = bitmap_w;
img->h = bitmap_h;
img->stride = stride;
img->bitmap = bitmap;
img->color = color;
img->dst_x = dst_x;
img->dst_y = dst_y;
priv->n_images++;
}
/**
* \brief convert bitmap glyph into ass_image_t struct(s)
* \param bit freetype bitmap glyph, FT_PIXEL_MODE_GRAY
* \param dst_x bitmap x coordinate in video frame
* \param dst_y bitmap y coordinate in video frame
* \param color first color, RGBA
* \param color2 second color, RGBA
* \param brk x coordinate relative to glyph origin, color is used to the left of brk, color2 - to the right
* Performs clipping. Uses my_draw_bitmap for actual bitmap convertion.
*/
static int render_glyph(FT_BitmapGlyph bit, int dst_x, int dst_y, uint32_t color, uint32_t color2, int brk)
{
// brk is relative to dst_x
// color = color left of brk
// color2 = color right of brk
int b_x0, b_y0, b_x1, b_y1; // visible part of the bitmap
int clip_x0, clip_y0, clip_x1, clip_y1;
int tmp;
FT_Bitmap* bitmap;
bitmap = &(bit->bitmap);
dst_x += bit->left;
dst_y -= bit->top;
brk -= bit->left;
if (bitmap->pixel_mode != FT_PIXEL_MODE_GRAY) {
mp_msg(MSGT_GLOBAL, MSGL_WARN, "Unsupported pixel mode: %d\n", (int)(bitmap->pixel_mode));
return 1;
}
// clipping
clip_x0 = render_context.clip_x0;
clip_y0 = render_context.clip_y0;
clip_x1 = render_context.clip_x1;
clip_y1 = render_context.clip_y1;
b_x0 = 0;
b_y0 = 0;
b_x1 = bitmap->width;
b_y1 = bitmap->rows;
tmp = dst_x - clip_x0;
if (tmp < 0) {
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "clip left\n");
b_x0 = - tmp;
}
tmp = dst_y - clip_y0;
if (tmp < 0) {
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "clip top\n");
b_y0 = - tmp;
}
tmp = clip_x1 - dst_x - bitmap->width;
if (tmp < 0) {
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "clip right\n");
b_x1 = bitmap->width + tmp;
}
tmp = clip_y1 - dst_y - bitmap->rows;
if (tmp < 0) {
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "clip bottom\n");
b_y1 = bitmap->rows + tmp;
}
if ((b_y0 >= b_y1) || (b_x0 >= b_x1))
return 0;
if (brk > b_x0) { // draw left part
if (brk > b_x1) brk = b_x1;
my_draw_bitmap(bitmap->buffer + bitmap->pitch * b_y0 + b_x0,
brk - b_x0, b_y1 - b_y0, bitmap->pitch,
dst_x + b_x0, dst_y + b_y0, color);
}
if (brk < b_x1) { // draw right part
if (brk < b_x0) brk = b_x0;
my_draw_bitmap(bitmap->buffer + bitmap->pitch * b_y0 + brk,
b_x1 - brk, b_y1 - b_y0, bitmap->pitch,
dst_x + brk, dst_y + b_y0, color2);
}
return 0;
}
/**
* \brief Render text_info_t struct into ass_images_t list
* Rasterize glyphs and put them in glyph cache.
*/
static int render_text(text_info_t* text_info, int dst_x, int dst_y)
{
int pen_x, pen_y;
int error, error2;
int i;
FT_Glyph image;
FT_BitmapGlyph bit;
glyph_hash_val_t hash_val;
for (i = 0; i < text_info->length; ++i) {
if (text_info->glyphs[i].bitmap != 1) {
if ((text_info->glyphs[i].symbol == '\n') || (text_info->glyphs[i].symbol == 0))
continue;
error = FT_Glyph_To_Bitmap( &(text_info->glyphs[i].outline_glyph), FT_RENDER_MODE_NORMAL, 0, 1);
error2 = FT_Glyph_To_Bitmap( &(text_info->glyphs[i].glyph), FT_RENDER_MODE_NORMAL, 0, 1);
if (error || error2) {
FT_Done_Glyph(text_info->glyphs[i].outline_glyph);
FT_Done_Glyph(text_info->glyphs[i].glyph);
mp_msg(MSGT_GLOBAL, MSGL_WARN, "FT_Glyph_To_Bitmap error %d %d, symbol %d, index %d\n",
error, error2, text_info->glyphs[i].symbol, text_info->glyphs[i].hash_key.index);
text_info->glyphs[i].symbol = 0; // do not render
continue;
}
// cache
text_info->glyphs[i].hash_key.bitmap = 1; // other hash_key fields were set in get_glyph()
hash_val.bbox_scaled = text_info->glyphs[i].bbox;
hash_val.outline_glyph = text_info->glyphs[i].outline_glyph;
hash_val.glyph = text_info->glyphs[i].glyph;
hash_val.advance.x = text_info->glyphs[i].advance.x;
hash_val.advance.y = text_info->glyphs[i].advance.y;
cache_add_glyph(&(text_info->glyphs[i].hash_key), &hash_val);
}
}
for (i = 0; i < text_info->length; ++i) {
glyph_info_t* info = text_info->glyphs + i;
if ((info->symbol == 0) || (info->symbol == '\n'))
continue;
pen_x = dst_x + info->pos.x;
pen_y = dst_y + info->pos.y;
image = info->outline_glyph;
bit = (FT_BitmapGlyph)image;
if ((info->effect_type == EF_KARAOKE_KO) && (info->effect_timing <= info->bbox.xMax)) {
// do nothing
} else
render_glyph(bit, pen_x, pen_y, info->c3, 0, 1000000);
}
for (i = 0; i < text_info->length; ++i) {
glyph_info_t* info = text_info->glyphs + i;
if ((info->symbol == 0) || (info->symbol == '\n'))
continue;
pen_x = dst_x + info->pos.x;
pen_y = dst_y + info->pos.y;
image = info->glyph;
bit = (FT_BitmapGlyph)image;
if ((info->effect_type == EF_KARAOKE) || (info->effect_type == EF_KARAOKE_KO)) {
if (info->effect_timing > info->bbox.xMax)
render_glyph(bit, pen_x, pen_y, info->c1, 0, 1000000);
else
render_glyph(bit, pen_x, pen_y, info->c2, 0, 1000000);
} else if (info->effect_type == EF_KARAOKE_KF) {
render_glyph(bit, pen_x, pen_y, info->c1, info->c2, info->effect_timing);
} else
render_glyph(bit, pen_x, pen_y, info->c1, 0, 1000000);
}
return 0;
}
/**
* \brief Mapping between script and screen coordinates
*/
static int x2scr(int x) {
return x*frame_context.width / frame_context.track->PlayResX;
}
/**
* \brief Mapping between script and screen coordinates
*/
static int y2scr(int y) {
return y * frame_context.orig_height / frame_context.track->PlayResY + global_settings->top_margin;
}
// the same for toptitles
static int y2scr_top(int y) {
return y * frame_context.orig_height / frame_context.track->PlayResY;
}
// the same for subtitles
static int y2scr_sub(int y) {
return y * frame_context.orig_height / frame_context.track->PlayResY + global_settings->top_margin + global_settings->bottom_margin;
}
static void vmirror_bbox(FT_BBox* orig, FT_BBox* pbbox) {
pbbox->xMin = orig->xMin;
pbbox->xMax = orig->xMax;
pbbox->yMin = - orig->yMax;
pbbox->yMax = - orig->yMin;
}
static void compute_string_bbox( text_info_t* info, FT_BBox *abbox ) {
FT_BBox bbox;
int n;
/* initialize string bbox to "empty" values */
bbox.xMin = bbox.yMin = 32000;
bbox.xMax = bbox.yMax = -32000;
/* for each glyph image, compute its bounding box, */
/* translate it, and grow the string bbox */
for ( n = 0; n < info->length; n++ ) {
FT_BBox glyph_bbox;
vmirror_bbox( &(info->glyphs[n].bbox), &glyph_bbox );
glyph_bbox.xMin += info->glyphs[n].pos.x;
glyph_bbox.xMax += info->glyphs[n].pos.x;
glyph_bbox.yMin += info->glyphs[n].pos.y;
glyph_bbox.yMax += info->glyphs[n].pos.y;
if ( glyph_bbox.xMin < bbox.xMin ) bbox.xMin = glyph_bbox.xMin;
if ( glyph_bbox.yMin < bbox.yMin ) bbox.yMin = glyph_bbox.yMin;
if ( glyph_bbox.xMax > bbox.xMax ) bbox.xMax = glyph_bbox.xMax;
if ( glyph_bbox.yMax > bbox.yMax ) bbox.yMax = glyph_bbox.yMax;
}
/* check that we really grew the string bbox */
if ( bbox.xMin > bbox.xMax ) {
bbox.xMin = 0;
bbox.yMin = 0;
bbox.xMax = 0;
bbox.yMax = 0;
}
/* return string bbox */
*abbox = bbox;
}
/**
* \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(int sz)
{
double size = (double)sz * global_settings->font_size_coeff * 0.8;
size *= frame_context.height;
size /= frame_context.track->PlayResY;
if (size < 1)
size = 1;
else if (size > frame_context.height * 2)
size = frame_context.height * 2;
FT_Set_Pixel_Sizes(render_context.face, 0, size);
render_context.font_size = sz;
}
/**
* \brief Change current font, using setting from render_context.
*/
static void update_font(void)
{
int error;
unsigned val;
ass_instance_t* priv = frame_context.ass_priv;
face_desc_t desc;
desc.family = strdup(render_context.family);
val = render_context.bold;
// 0 = normal, 1 = bold, >1 = exact weight
if (val == 0) val = 80; // normal
else if (val == 1) val = 200; // bold
desc.bold = val;
val = render_context.italic;
if (val == 0) val = 0; // normal
else if (val == 1) val = 110; //italic
desc.italic = val;
error = ass_new_face(priv->library, priv->fontconfig_priv, &desc, &(render_context.face));
if (error) {
render_context.face = 0;
}
if (render_context.face)
{
change_font_size(render_context.font_size);
}
}
/**
* \brief Change border width
*/
static void change_border(double border)
{
if (!render_context.stroker) {
if (!no_more_font_messages)
mp_msg(MSGT_GLOBAL, MSGL_WARN, "No stroker!\n");
} else {
render_context.border = border;
FT_Stroker_Set( render_context.stroker,
(int)(64 * border),
FT_STROKER_LINECAP_ROUND,
FT_STROKER_LINEJOIN_ROUND,
0 );
}
}
#define _r(c) ((c)>>24)
#define _g(c) (((c)>>16)&0xFF)
#define _b(c) (((c)>>8)&0xFF)
#define _a(c) ((c)&0xFF)
/**
* \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
static void change_alpha(uint32_t* var, uint32_t new, double pwr)
{
*var = (_r(*var) << 24) + (_g(*var) << 16) + (_b(*var) << 8) + (_a(*var) * (1 - pwr) + _a(new) * pwr);
}
/**
* \brief Calculate alpha value by piecewise linear function
* Used for \fad, \fade implementation.
*/
static void 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;
}
change_alpha(&render_context.c1, a, 1.);
change_alpha(&render_context.c2, a, 1.);
change_alpha(&render_context.c3, a, 1.);
change_alpha(&render_context.c4, a, 1.);
}
/**
* \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(char* p, double pwr) {
#define skip_all(x) if (*p == (x)) ++p; else { \
while ((*p != (x)) && (*p != '}') && (*p != 0)) {++p;} }
#define skip(x) if (*p == (x)) ++p; else { return p; }
skip_all('\\');
if ((*p == '}') || (*p == 0))
return p;
if (mystrcmp(&p, "fsc")) {
char tp = *p++;
double val;
if (tp == 'x') {
if (mystrtod(&p, &val)) {
val /= 100;
render_context.scale_x = (val - 1.) * pwr + 1.;
} else
render_context.scale_x = render_context.style->ScaleX;
} else if (tp == 'y') {
if (mystrtod(&p, &val)) {
val /= 100;
render_context.scale_y = (val - 1.) * pwr + 1.;
} else
render_context.scale_y = render_context.style->ScaleY;
}
} else if (mystrcmp(&p, "fsp")) {
int val;
if (mystrtoi(&p, 10, &val))
render_context.hspacing = val * pwr;
else
render_context.hspacing = 0;
} else if (mystrcmp(&p, "fs")) {
int val;
if (mystrtoi(&p, 10, &val))
val = render_context.font_size * ( 1 - pwr ) + val * pwr;
else
val = render_context.style->FontSize;
if (render_context.face)
change_font_size(val);
} else if (mystrcmp(&p, "bord")) {
double val;
if (mystrtod(&p, &val))
val = render_context.border * ( 1 - pwr ) + val * pwr;
else
val = (render_context.style->BorderStyle == 1) ? render_context.style->Outline : 1.;
change_border(val);
} else if (mystrcmp(&p, "move")) {
int x1, x2, y1, y2;
long long t1, t2, delta_t, t;
int x, y;
double k;
skip('(');
x1 = strtol(p, &p, 10);
skip(',');
y1 = strtol(p, &p, 10);
skip(',');
x2 = strtol(p, &p, 10);
skip(',');
y2 = strtol(p, &p, 10);
if (*p == ',') {
skip(',');
t1 = strtoll(p, &p, 10);
skip(',');
t2 = strtoll(p, &p, 10);
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "movement6: (%d, %d) -> (%d, %d), (%lld .. %lld)\n", x1, y1, x2, y2, t1, t2);
} else {
t1 = 0;
t2 = render_context.event->Duration;
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "movement: (%d, %d) -> (%d, %d)\n", x1, y1, x2, y2);
}
skip(')');
delta_t = t2 - t1;
t = frame_context.time - render_context.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;
render_context.pos_x = x;
render_context.pos_y = y;
render_context.detect_collisions = 0;
render_context.evt_type = EVENT_POSITIONED;
} else if (mystrcmp(&p, "frx") || mystrcmp(&p, "fry")) {
int val;
mystrtoi(&p, 10, &val);
mp_msg(MSGT_GLOBAL, MSGL_V, "frx/fry unimplemented \n");
} else if (mystrcmp(&p, "frz") || mystrcmp(&p, "fr")) {
double angle;
int val;
val = strtol(p, &p, 10);
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "setting rotation to %.2f\n", val * pwr);
angle = M_PI * val / 180;
render_context.rotation = angle * pwr;
} else if (mystrcmp(&p, "fn")) {
char* start = p;
char* family;
skip_all('\\');
family = malloc(p - start + 1);
strncpy(family, start, p - start);
family[p - start] = '\0';
if (render_context.family)
free(render_context.family);
render_context.family = family;
update_font();
} else if (mystrcmp(&p, "alpha")) {
uint32_t val;
if (strtocolor(&p, &val)) {
unsigned char a = val >> 24;
change_alpha(&render_context.c1, a, pwr);
change_alpha(&render_context.c2, a, pwr);
change_alpha(&render_context.c3, a, pwr);
change_alpha(&render_context.c4, a, pwr);
} else {
change_alpha(&render_context.c1, render_context.style->PrimaryColour, pwr);
change_alpha(&render_context.c2, render_context.style->SecondaryColour, pwr);
change_alpha(&render_context.c3, render_context.style->OutlineColour, pwr);
change_alpha(&render_context.c4, render_context.style->BackColour, pwr);
}
// FIXME: simplify
} else if (mystrcmp(&p, "an")) {
int val = strtol(p, &p, 10);
int v = (val - 1) / 3; // 0, 1 or 2 for vertical alignment
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "an %d\n", val);
if (v != 0) v = 3 - v;
val = ((val - 1) % 3) + 1; // horizontal alignment
val += v*4;
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "align %d\n", val);
render_context.alignment = val;
} else if (mystrcmp(&p, "a")) {
int val = strtol(p, &p, 10);
render_context.alignment = val;
} else if (mystrcmp(&p, "pos")) {
int v1, v2;
skip('(');
v1 = strtol(p, &p, 10);
skip(',');
v2 = strtol(p, &p, 10);
skip(')');
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "pos(%d, %d)\n", v1, v2);
render_context.evt_type = EVENT_POSITIONED;
render_context.detect_collisions = 0;
render_context.pos_x = v1;
render_context.pos_y = v2;
} else if (mystrcmp(&p, "fade")) {
int a1, a2, a3, v1, v2, v3, v4;
skip('(');
a1 = strtol(p, &p, 10);
skip(',');
a2 = strtol(p, &p, 10);
skip(',');
a3 = strtol(p, &p, 10);
skip(',');
v1 = strtol(p, &p, 10);
skip(',');
v2 = strtol(p, &p, 10);
skip(',');
v3 = strtol(p, &p, 10);
skip(',');
v4 = strtol(p, &p, 10);
skip(')');
interpolate_alpha(frame_context.time - render_context.event->Start, v1, v2, v3, v4, a1, a2, a3);
} else if (mystrcmp(&p, "fad")) {
int v1, v2;
long long now, t1, t2, t3, t4;
skip('(');
v1 = strtol(p, &p, 10);
skip(',');
v2 = strtol(p, &p, 10);
skip(')');
now = frame_context.time;
t1 = render_context.event->Start;
t2 = t1 + v1;
t4 = render_context.event->Start + render_context.event->Duration;
t3 = t4 - v2;
interpolate_alpha(now, t1, t2, t3, t4, 0xFF, 0, 0xFF);
} else if (mystrcmp(&p, "org")) {
int v1, v2;
skip('(');
v1 = strtol(p, &p, 10);
skip(',');
v2 = strtol(p, &p, 10);
skip(')');
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "org(%d, %d)\n", v1, v2);
// render_context.evt_type = EVENT_POSITIONED;
render_context.org_x = v1;
render_context.org_y = v2;
} 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]; v3 = v[2];
} else if (cnt == 2) {
v1 = v[0]; v2 = v[1]; v3 = 1.;
} else if (cnt == 1) {
v1 = 0; v2 = render_context.event->Duration; v3 = v[0];
} else { // cnt == 0
v1 = 0; v2 = render_context.event->Duration; v3 = 1.;
}
render_context.detect_collisions = 0;
t1 = v1;
t2 = v2;
delta_t = v2 - v1;
t = frame_context.time - render_context.event->Start; // FIXME: move to render_context
if (t < t1)
k = 0.;
else if (t > t2)
k = 1.;
else k = ((double)(t - t1)) / delta_t;
while (*p == '\\')
p = parse_tag(p, k); // maybe k*pwr ? no, specs forbid nested \t's
skip_all(')'); // FIXME: better skip(')'), but much more tags support required
} else if (mystrcmp(&p, "clip")) {
int x0, y0, x1, y1;
int res = 1;
skip('(');
res &= mystrtoi(&p, 10, &x0);
skip(',');
res &= mystrtoi(&p, 10, &y0);
skip(',');
res &= mystrtoi(&p, 10, &x1);
skip(',');
res &= mystrtoi(&p, 10, &y1);
skip(')');
if (res) {
render_context.clip_x0 = render_context.clip_x0 * (1-pwr) + x0 * pwr;
render_context.clip_x1 = render_context.clip_x1 * (1-pwr) + x1 * pwr;
render_context.clip_y0 = render_context.clip_y0 * (1-pwr) + y0 * pwr;
render_context.clip_y1 = render_context.clip_y1 * (1-pwr) + y1 * pwr;
} else {
render_context.clip_x0 = 0;
render_context.clip_y0 = 0;
render_context.clip_x1 = frame_context.track->PlayResX;
render_context.clip_y1 = frame_context.track->PlayResY;
}
} else if (mystrcmp(&p, "c")) {
uint32_t val;
if (!strtocolor(&p, &val))
val = render_context.style->PrimaryColour;
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "color: %X\n", val);
change_color(&render_context.c1, val, pwr);
} else if ((*p >= '1') && (*p <= '4') && (++p) && (mystrcmp(&p, "c") || mystrcmp(&p, "a"))) {
char n = *(p-2);
char cmd = *(p-1);
uint32_t* pcolor;
uint32_t val;
assert((n >= '1') && (n <= '4'));
if (!strtocolor(&p, &val))
switch(n) {
case '1': val = render_context.style->PrimaryColour; break;
case '2': val = render_context.style->SecondaryColour; break;
case '3': val = render_context.style->OutlineColour; break;
case '4': val = render_context.style->BackColour; break;
default : val = 0; break; // impossible due to assert; avoid compilation warning
}
switch (n) {
case '1': pcolor = &render_context.c1; break;
case '2': pcolor = &render_context.c2; break;
case '3': pcolor = &render_context.c3; break;
case '4': pcolor = &render_context.c4; break;
default : pcolor = 0; break;
}
switch (cmd) {
case 'c': change_color(pcolor, val, pwr); break;
case 'a': change_alpha(pcolor, val >> 24, pwr); break;
default: mp_msg(MSGT_GLOBAL, MSGL_WARN, "Bad command: %c%c\n", n, cmd); break;
}
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "single c/a at %f: %c%c = %X \n", pwr, n, cmd, *pcolor);
} else if (mystrcmp(&p, "r")) {
render_context.c1 = render_context.style->PrimaryColour;
render_context.c2 = render_context.style->SecondaryColour;
render_context.c3 = render_context.style->OutlineColour;
render_context.c4 = render_context.style->BackColour;
render_context.font_size = render_context.style->FontSize;
if (render_context.family)
free(render_context.family);
render_context.family = strdup(render_context.style->FontName);
render_context.bold = - render_context.style->Bold;
render_context.italic = - render_context.style->Italic;
update_font();
if (render_context.stroker) {
double border = (render_context.style->BorderStyle == 1) ? render_context.style->Outline : 1.;
change_border(border);
}
render_context.scale_x = render_context.style->ScaleX;
render_context.scale_y = render_context.style->ScaleY;
render_context.hspacing = 0; // FIXME
// FIXME: does not reset unsupported attributes.
} else if (mystrcmp(&p, "be")) {
int val;
mystrtoi(&p, 10, &val);
mp_msg(MSGT_GLOBAL, MSGL_V, "be unimplemented \n");
} else if (mystrcmp(&p, "b")) {
int b;
if (mystrtoi(&p, 10, &b))
render_context.bold = b;
else
render_context.bold = - render_context.style->Bold;
update_font();
} else if (mystrcmp(&p, "i")) {
int i;
if (mystrtoi(&p, 10, &i))
render_context.italic = i;
else
render_context.italic = - render_context.style->Italic;
update_font();
} else if (mystrcmp(&p, "kf") || mystrcmp(&p, "K")) {
int val = strtol(p, &p, 10);
render_context.effect_type = EF_KARAOKE_KF;
render_context.effect_timing = val * 10;
} else if (mystrcmp(&p, "ko")) {
int val = strtol(p, &p, 10);
render_context.effect_type = EF_KARAOKE_KO;
render_context.effect_timing = val * 10;
} else if (mystrcmp(&p, "k")) {
int val = strtol(p, &p, 10);
render_context.effect_type = EF_KARAOKE;
render_context.effect_timing = val * 10;
}
return p;
#undef skip
#undef skip_all
}
/**
* \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
*/
static unsigned get_next_char(char** str)
{
char* p = *str;
unsigned chr;
if (*p == '{') { // '\0' goes here
p++;
while (1) {
p = parse_tag(p, 1.);
if (*p == '}') { // end of tag
p++;
if (*p == '{') {
p++;
continue;
} else
break;
} else if (*p != '\\')
mp_msg(MSGT_GLOBAL, MSGL_V, "Unable to parse: \"%s\" \n", p);
if (*p == 0)
break;
}
}
if (*p == '\t') {
++p;
*str = p;
return ' ';
}
if (*p == '\\') {
if ((*(p+1) == 'N') || ((*(p+1) == 'n') && (frame_context.track->WrapStyle == 2))) {
p += 2;
*str = p;
return '\n';
} else if (*(p+1) == 'n') {
p += 2;
*str = p;
return ' ';
}
}
chr = utf8_get_char(&p);
*str = p;
return chr;
}
/**
* \brief Start new event. Reset render_context.
*/
static int init_render_context(ass_event_t* event)
{
int error;
// init render_context
render_context.event = event;
render_context.style = frame_context.track->styles + event->Style;
render_context.font_size = render_context.style->FontSize;
render_context.evt_type = EVENT_NORMAL;
render_context.alignment = 0;
render_context.rotation = 0.;
render_context.pos_x = 0;
render_context.pos_y = 0;
render_context.org_x = 0;
render_context.org_y = 0;
render_context.scale_x = render_context.style->ScaleX;
render_context.scale_y = render_context.style->ScaleY;
render_context.hspacing = 0;
render_context.c1 = render_context.style->PrimaryColour;
render_context.c2 = render_context.style->SecondaryColour;
render_context.c3 = render_context.style->OutlineColour;
render_context.c4 = render_context.style->BackColour;
render_context.clip_x0 = 0;
render_context.clip_y0 = 0;
render_context.clip_x1 = frame_context.track->PlayResX;
render_context.clip_y1 = frame_context.track->PlayResY;
render_context.detect_collisions = 1;
if (render_context.family)
free(render_context.family);
render_context.family = strdup(render_context.style->FontName);
render_context.bold = - render_context.style->Bold; // style value for bold text is -1
render_context.italic = - render_context.style->Italic;
update_font();
if (render_context.face) {
#if (FREETYPE_MAJOR > 2) || ((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR > 1))
error = FT_Stroker_New( ass_instance->library, &render_context.stroker );
#else // < 2.2
error = FT_Stroker_New( render_context.face->memory, &render_context.stroker );
#endif
if ( error ) {
mp_msg(MSGT_GLOBAL, MSGL_V, "failed to get stroker\n");
render_context.stroker = 0;
} else {
// FIXME: probably wrong when render_context.Border == 3
double border = (render_context.style->BorderStyle == 1) ? render_context.style->Outline : 1.;
change_border(border);
}
}
return 0;
}
static int free_render_context(void)
{
if (render_context.stroker != 0) {
FT_Stroker_Done(render_context.stroker);
render_context.stroker = 0;
}
return 0;
}
/**
* \brief Get normal and outline glyphs from cache (if possible) or font face
* \param index face glyph index
* \param symbol ucs4 char
* \param info out: struct filled with extracted data
* \param advance advance vector of the extracted glyph
* \return 0 on success
*/
static int get_glyph(int index, int symbol, glyph_info_t* info, FT_Vector* advance)
{
int error;
glyph_hash_val_t* val;
glyph_hash_key_t* key = &(info->hash_key);
key->face = render_context.face;
key->size = render_context.font_size;
key->index = index;
key->outline = (render_context.border * 0xFFFF); // convert to 16.16
key->scale_x = (render_context.scale_x * 0xFFFF);
key->scale_y = (render_context.scale_y * 0xFFFF);
key->angle = (render_context.rotation * 0xFFFF);
key->advance = *advance;
key->bold = render_context.bold;
key->italic = render_context.italic;
key->bitmap = 1; // looking for bitmap glyph
val = cache_find_glyph(key);
// val = 0;
if (val) {
// bitmap glyph found, no need for FT_Glyph_Copy
info->glyph = val->glyph;
info->outline_glyph = val->outline_glyph;
info->bbox = val->bbox_scaled;
info->advance.x = val->advance.x;
info->advance.y = val->advance.y;
info->bitmap = 1; // bitmap glyph
return 0;
}
// not found, get a new outline glyph from face
// mp_msg(MSGT_GLOBAL, MSGL_INFO, "miss, index = %d, symbol = %c, adv = (%d, %d)\n", index, symbol, advance->x, advance->y);
error = FT_Load_Glyph(render_context.face, index, FT_LOAD_NO_BITMAP );
if (error) {
mp_msg(MSGT_GLOBAL, MSGL_WARN, "Error loading glyph\n");
return error;
}
#if (FREETYPE_MAJOR > 2) || \
((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR >= 2)) || \
((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR == 1) && (FREETYPE_PATCH >= 10))
// FreeType >= 2.1.10 required
if (!(render_context.face->style_flags & FT_STYLE_FLAG_ITALIC) &&
((render_context.italic == 1) || (render_context.italic > 55))) {
FT_GlyphSlot_Oblique(render_context.face->glyph);
}
#endif
error = FT_Get_Glyph(render_context.face->glyph, &(info->glyph));
if (error) {
mp_msg(MSGT_GLOBAL, MSGL_WARN, "Error getting glyph\n");
return error;
}
info->advance.x = info->glyph->advance.x >> 10;
info->advance.y = info->glyph->advance.y >> 10;
info->outline_glyph = info->glyph;
error = FT_Glyph_Stroke( &(info->outline_glyph), render_context.stroker, 0 ); // don't destroy original
if (error) {
mp_msg(MSGT_GLOBAL, MSGL_WARN, "FT_Glyph_Stroke error %d \n", error);
FT_Glyph_Copy(info->glyph, &info->outline_glyph);
}
info->bitmap = 0; // outline glyph
return 0;
}
/**
* \brief rearrange text between lines
* \param max_text_width maximal text line width in pixels
* The algo is similar to the one in libvo/sub.c:
* 1. Place text, wrapping it when current line is full
* 2. Try moving words from the end of a line to the beginning of the next one while it reduces
* the difference in lengths between this two lines.
* The result may not be optimal, but usually is good enough.
*/
static void wrap_lines_smart(int max_text_width)
{
int i, j;
glyph_info_t *cur, *s1, *e1, *s2, *s3, *w;
int last_space;
int break_type;
int exit;
int pen_shift_x;
int pen_shift_y;
int max_asc, max_desc;
int cur_line;
last_space = -1;
text_info.n_lines = 1;
break_type = 0;
s1 = text_info.glyphs; // current line start
for (i = 0; i < text_info.length; ++i) {
cur = text_info.glyphs + i;
int break_at = -1;
int s_offset = s1->bbox.xMin + s1->pos.x;
int len = (cur->bbox.xMax + cur->pos.x) - s_offset;
if (cur->symbol == '\n') {
break_type = 2;
break_at = i;
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "forced line break at %d\n", break_at);
}
if (len >= max_text_width) {
break_type = 1;
break_at = last_space;
if (break_at == -1)
break_at = i - 1;
if (break_at == -1)
break_at = 0;
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "overfill at %d\n", i);
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "line break at %d\n", break_at);
}
if (break_at != -1) {
// need to use one more line
// marking break_at+1 as start of a new line
int lead = break_at + 1; // the first symbol of the new line
if (text_info.n_lines >= MAX_LINES) {
// to many lines !
// no more linebreaks
for (j = lead; j < text_info.length; ++j)
text_info.glyphs[j].linebreak = 0;
break;
}
if (lead < text_info.length)
text_info.glyphs[lead].linebreak = break_type;
last_space = -1;
s1 = text_info.glyphs + lead;
s_offset = s1->bbox.xMin + s1->pos.x;
text_info.n_lines ++;
}
if (cur->symbol == ' ')
last_space = i;
}
#define DIFF(x,y) (((x) < (y)) ? (y - x) : (x - y))
exit = 0;
while (!exit) {
exit = 1;
w = s3 = text_info.glyphs;
s1 = s2 = 0;
for (i = 0; i <= text_info.length; ++i) {
cur = text_info.glyphs + i;
if ((i == text_info.length) || cur->linebreak) {
s1 = s2;
s2 = s3;
s3 = cur;
// printf("line: %d, %d, %d \n", s1 - text_info.glyphs, s2 - text_info.glyphs, s3 - text_info.glyphs);
if (s1 && (s2->linebreak == 1)) { // have at least 2 lines, and linebreak is 'soft'
int l1, l2, l1_new, l2_new;
w = s2;
do { --w; } while ((w > s1) && (w->symbol == ' '));
do { --w; } while ((w > s1) && (w->symbol != ' '));
e1 = w;
do { --e1; } while ((e1 > s1) && (e1->symbol == ' '));
if (w->symbol == ' ') ++w;
// printf("check: %d, %d, %d, w: %d, e: %d \n", s1 - text_info.glyphs, s2 - text_info.glyphs, s3 - text_info.glyphs,
// w - text_info.glyphs, e1 - text_info.glyphs);
l1 = ((s2-1)->bbox.xMax + (s2-1)->pos.x) - (s1->bbox.xMin + s1->pos.x);
l2 = ((s3-1)->bbox.xMax + (s3-1)->pos.x) - (s2->bbox.xMin + s2->pos.x);
l1_new = (e1->bbox.xMax + e1->pos.x) - (s1->bbox.xMin + s1->pos.x);
l2_new = ((s3-1)->bbox.xMax + (s3-1)->pos.x) - (w->bbox.xMin + w->pos.x);
if (DIFF(l1_new, l2_new) < DIFF(l1, l2)) {
w->linebreak = 1;
s2->linebreak = 0;
exit = 0;
}
}
}
if (i == text_info.length)
break;
}
}
assert(text_info.n_lines >= 1);
#undef DIFF
text_info.height = 0;
max_asc = max_desc = 0;
cur_line = 0;
for (i = 0; i < text_info.length + 1; ++i) {
if ((i == text_info.length) || text_info.glyphs[i].linebreak) {
text_info.lines[cur_line].asc = max_asc;
text_info.lines[cur_line].desc = max_desc;
text_info.height += max_asc + max_desc;
cur_line ++;
max_asc = max_desc = 0;
}
if (i < text_info.length) {
cur = text_info.glyphs + i;
if (cur->asc > max_asc)
max_asc = cur->asc * render_context.scale_y;
if (cur->desc > max_desc)
max_desc = cur->desc * render_context.scale_y;
}
}
pen_shift_x = 0;
pen_shift_y = 0;
cur_line = 1;
for (i = 0; i < text_info.length; ++i) {
cur = text_info.glyphs + i;
if (cur->linebreak) {
int height = text_info.lines[cur_line - 1].desc + text_info.lines[cur_line].asc;
cur_line ++;
pen_shift_x = - cur->pos.x;
pen_shift_y += (height >> 6) + global_settings->line_spacing;
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "shifting from %d to %d by (%d, %d)\n", i, text_info.length - 1, pen_shift_x, pen_shift_y);
}
cur->pos.x += pen_shift_x;
cur->pos.y += pen_shift_y;
}
// printf("============= \n");
}
/**
* \brief determine karaoke effects
* Karaoke effects cannot be calculated during parse stage (get_next_char()),
* so they are done in a separate step.
* Parse stage: when karaoke style override is found, its parameters are stored in the next glyph's
* (the first glyph of the karaoke word)'s effect_type and effect_timing.
* This function:
* 1. sets effect_type for all glyphs in the word (_karaoke_ word)
* 2. sets effect_timing for all glyphs to x coordinate of the border line between the left and right karaoke parts
* (left part is filled with PrimaryColour, right one - with SecondaryColour).
*/
static void process_karaoke_effects(void)
{
glyph_info_t *cur, *cur2;
glyph_info_t *s1, *e1; // start and end of the current word
glyph_info_t *s2; // start of the next word
int i;
int timing; // current timing
int tm_start, tm_end; // timings at start and end of the current word
int tm_current;
double dt;
int x;
int x_start, x_end;
tm_current = frame_context.time - render_context.event->Start;
timing = 0;
s1 = s2 = 0;
for (i = 0; i <= text_info.length; ++i) {
cur = text_info.glyphs + i;
if ((i == text_info.length) || (cur->effect_type != EF_NONE)) {
s1 = s2;
s2 = cur;
if (s1) {
e1 = s2 - 1;
tm_start = timing;
tm_end = timing + s1->effect_timing;
timing = tm_end;
x_start = s1->bbox.xMin + s1->pos.x;
x_end = e1->bbox.xMax + e1->pos.x;
dt = (tm_current - tm_start);
if ((s1->effect_type == EF_KARAOKE) || (s1->effect_type == EF_KARAOKE_KO)) {
if (dt > 0)
x = x_end + 1;
else
x = x_start;
} else if (s1->effect_type == EF_KARAOKE_KF) {
dt /= (tm_end - tm_start);
x = x_start + (x_end - x_start) * dt;
} else {
mp_msg(MSGT_GLOBAL, MSGL_ERR, "Unknown effect type (internal error) \n");
continue;
}
for (cur2 = s1; cur2 <= e1; ++cur2) {
cur2->effect_type = s1->effect_type;
cur2->effect_timing = x - cur2->pos.x;
}
}
}
}
}
static int get_face_ascender(FT_Face face)
{
int v = face->size->metrics.ascender;
if (!v)
v = FT_MulFix(face->bbox.yMax, face->size->metrics.y_scale);
return v;
}
static int get_face_descender(FT_Face face)
{
int v = face->size->metrics.descender;
if (!v)
v = FT_MulFix(face->bbox.yMin, face->size->metrics.y_scale);
return -v;
}
/**
* \brief Main ass rendering function, glues everything together
* \param event event to render
* Process event, appending resulting ass_image_t's to images_root.
*/
int ass_render_event(ass_event_t* event)
{
char* p;
FT_UInt glyph_index;
FT_Bool use_kerning;
FT_UInt previous;
FT_UInt num_glyphs;
FT_Vector pen;
int error;
unsigned code;
FT_BBox bbox;
int i, j;
FT_Vector shift;
int MarginL, MarginR, MarginV;
int max_text_width;
ass_style_t* style = frame_context.track->styles + event->Style;
int last_break;
int alignment, halign, valign;
int device_x, device_y;
init_render_context(event);
text_info.length = 0;
pen.x = 0;
pen.y = 0;
previous = 0;
num_glyphs = 0;
p = event->Text;
if (!p) {
mp_msg(MSGT_GLOBAL, MSGL_WARN, "Empty event!\n");
return 0;
}
// Event parsing.
while (1) {
render_context.effect_type = EF_NONE;
// get next char, executing style override
// this affects render_context
code = get_next_char(&p);
// face could have been changed in get_next_char
if (!render_context.face) {
free_render_context();
return 0;
}
if (code == 0)
break;
use_kerning = FT_HAS_KERNING(render_context.face);
if (text_info.length >= MAX_GLYPHS) {
mp_msg(MSGT_GLOBAL, MSGL_WARN, "\nMAX_GLYPHS reached: event %d, start = %llu, duration = %llu\n Text = %s\n",
(int)(event - frame_context.track->events), event->Start, event->Duration, event->Text);
break;
}
glyph_index = FT_Get_Char_Index( render_context.face, code);
if ( use_kerning && previous && glyph_index ) {
FT_Vector delta;
FT_Get_Kerning( render_context.face, previous, glyph_index, FT_KERNING_DEFAULT, &delta );
pen.x += delta.x;
pen.y += delta.y;
}
shift.x = pen.x & 63;
shift.y = pen.y & 63;
if ((render_context.scale_x != 1.) || (render_context.scale_y != 1.) ||
(frame_context.font_scale_x != 1.)) {
FT_Matrix matrix;
matrix.xx = (FT_Fixed)( render_context.scale_x * frame_context.font_scale_x * 0x10000L );
matrix.xy = (FT_Fixed)( 0 * 0x10000L );
matrix.yx = (FT_Fixed)( 0 * 0x10000L );
matrix.yy = (FT_Fixed)( render_context.scale_y * 0x10000L );
FT_Set_Transform( render_context.face, &matrix, &shift );
} else {
FT_Set_Transform(render_context.face, 0, &shift);
}
error = get_glyph(glyph_index, code, text_info.glyphs + text_info.length, &shift);
if (error) {
continue;
}
text_info.glyphs[text_info.length].pos.x = pen.x >> 6;
text_info.glyphs[text_info.length].pos.y = pen.y >> 6;
pen.x += text_info.glyphs[text_info.length].advance.x;
pen.x += render_context.hspacing;
pen.y += text_info.glyphs[text_info.length].advance.y;
// if it's an outline glyph, we still need to fill the bbox
if (text_info.glyphs[text_info.length].bitmap != 1) {
FT_Glyph_Get_CBox( text_info.glyphs[text_info.length].glyph, FT_GLYPH_BBOX_PIXELS, &(text_info.glyphs[text_info.length].bbox) );
}
previous = glyph_index;
text_info.glyphs[text_info.length].symbol = code;
text_info.glyphs[text_info.length].linebreak = 0;
text_info.glyphs[text_info.length].c1 = render_context.c1;
text_info.glyphs[text_info.length].c2 = render_context.c2;
text_info.glyphs[text_info.length].c3 = render_context.c3;
text_info.glyphs[text_info.length].c4 = render_context.c4;
text_info.glyphs[text_info.length].effect_type = render_context.effect_type;
text_info.glyphs[text_info.length].effect_timing = render_context.effect_timing;
text_info.glyphs[text_info.length].asc = get_face_ascender(render_context.face);
text_info.glyphs[text_info.length].desc = get_face_descender(render_context.face);
text_info.length++;
}
if (text_info.length == 0) {
// no valid symbols in the event; this can be smth like {comment}
free_render_context();
return 0;
}
// depends on glyph x coordinates being monotonous, so it should be done before line wrap
process_karaoke_effects();
// calculate max length of a line
MarginL = (event->MarginL) ? event->MarginL : style->MarginL;
MarginR = (event->MarginR) ? event->MarginR : style->MarginR;
MarginV = (event->MarginV) ? event->MarginV : style->MarginV;
max_text_width = x2scr(frame_context.track->PlayResX - MarginR) - x2scr(MarginL);
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "normal text width: %d\n", max_text_width);
// rearrange text in several lines
wrap_lines_smart(max_text_width);
// alignments
alignment = render_context.alignment;
if (!alignment)
alignment = render_context.style->Alignment;
halign = alignment & 3;
valign = alignment & 12;
// align text
last_break = -1;
for (i = 1; i < text_info.length + 1; ++i) { // (text_info.length + 1) is the end of the last line
if ((i == text_info.length) || text_info.glyphs[i].linebreak) {
glyph_info_t* first_glyph = text_info.glyphs + last_break + 1;
glyph_info_t* last_glyph = text_info.glyphs + i - 1;
while ((last_glyph >= first_glyph) && ((last_glyph->symbol == '\n') || (last_glyph->symbol == 0)))
last_glyph --;
int width = last_glyph->pos.x + last_glyph->bbox.xMax - first_glyph->pos.x - first_glyph->bbox.xMin;
int shift = - first_glyph->bbox.xMin; // now text line starts exactly at 0 (left margin)
if (halign == HALIGN_LEFT) { // left aligned, no action
} else if (halign == HALIGN_RIGHT) { // right aligned
shift = max_text_width - width;
} else if (halign == HALIGN_CENTER) { // centered
shift = (max_text_width - width) / 2;
}
for (j = last_break + 1; j < i; ++j) {
text_info.glyphs[j].pos.x += shift;
}
last_break = i - 1;
}
}
// determing text bounding box
compute_string_bbox(&text_info, &bbox);
// determine device coordinates for text
// FIXME: using current font descender, ascender and height here is wrong.
// correct way is using max(descender) over all the fonts used in a line
// the same for height and ascender
if (render_context.evt_type == EVENT_NORMAL) {
device_x = x2scr(MarginL);
if (valign == VALIGN_TOP) { // toptitle
device_y = y2scr_top(MarginV) + (text_info.lines[0].asc >> 6);
if (render_context.detect_collisions) {
device_y += frame_context.add_top_margin;
frame_context.add_top_margin += (text_info.height >> 6);
}
} else if (valign == VALIGN_CENTER) { // midtitle
int scr_y = y2scr(frame_context.track->PlayResY / 2);
device_y = scr_y - (bbox.yMax - bbox.yMin) / 2;
} else { // subtitle
int scr_y;
if (valign != VALIGN_SUB)
mp_msg(MSGT_GLOBAL, MSGL_V, "Invalid valign, supposing 0 (subtitle)\n");
scr_y = y2scr_sub(frame_context.track->PlayResY - MarginV);
device_y = scr_y;
device_y -= (text_info.height >> 6);
device_y += (text_info.lines[0].asc >> 6);
if (render_context.detect_collisions) {
device_y -= frame_context.add_bottom_margin;
frame_context.add_bottom_margin += (text_info.height >> 6);
}
}
} else if (render_context.evt_type == EVENT_POSITIONED) {
int align_shift_x = 0;
int align_shift_y = 0;
mp_msg(MSGT_GLOBAL, MSGL_DBG2, "positioned event at %d, %d\n", render_context.pos_x, render_context.pos_y);
switch(halign) {
case HALIGN_LEFT:
align_shift_x = - bbox.xMin;
break;
case HALIGN_CENTER:
align_shift_x = - (bbox.xMax + bbox.xMin) /2;
break;
case HALIGN_RIGHT:
align_shift_x = - bbox.xMax;
break;
}
switch(valign) {
case VALIGN_TOP:
align_shift_y = - bbox.yMin;
break;
case VALIGN_CENTER:
align_shift_y = - (bbox.yMax + bbox.yMin) /2;
break;
case VALIGN_SUB:
align_shift_y = - bbox.yMax;
break;
}
device_x = x2scr(render_context.pos_x) + align_shift_x;
device_y = y2scr(render_context.pos_y) + align_shift_y;
} else {
mp_msg(MSGT_GLOBAL, MSGL_V, "unknown evt_type\n");
device_x = 10;
device_y = 10;
}
// fix clip coordinates (they depend on alignment)
render_context.clip_x0 = x2scr(render_context.clip_x0);
render_context.clip_x1 = x2scr(render_context.clip_x1);
if (render_context.evt_type == EVENT_NORMAL) {
if (valign == VALIGN_TOP) {
render_context.clip_y0 = y2scr_top(render_context.clip_y0);
render_context.clip_y1 = y2scr_top(render_context.clip_y1);
} else if (valign == VALIGN_CENTER) {
render_context.clip_y0 = y2scr(render_context.clip_y0);
render_context.clip_y1 = y2scr(render_context.clip_y1);
} else if (valign == VALIGN_SUB) {
render_context.clip_y0 = y2scr_sub(render_context.clip_y0);
render_context.clip_y1 = y2scr_sub(render_context.clip_y1);
}
} else if (render_context.evt_type == EVENT_POSITIONED) {
render_context.clip_y0 = y2scr(render_context.clip_y0);
render_context.clip_y1 = y2scr(render_context.clip_y1);
}
// rotate glyphs if needed
if (render_context.rotation != 0.) {
double angle = render_context.rotation;
FT_Vector center;
FT_Matrix matrix_rotate;
matrix_rotate.xx = (FT_Fixed)( cos( angle ) * 0x10000L );
matrix_rotate.xy = (FT_Fixed)( -sin( angle ) * 0x10000L );
matrix_rotate.yx = (FT_Fixed)( sin( angle ) * 0x10000L );
matrix_rotate.yy = (FT_Fixed)( cos( angle ) * 0x10000L );
if (((render_context.org_x != 0) || (render_context.org_y != 0)) && (render_context.evt_type == EVENT_POSITIONED)) {
center.x = render_context.org_x;
center.y = render_context.org_y;
} else {
FT_BBox str_bbox;
center.x = text_info.glyphs[0].pos.x + device_x;
center.y = text_info.glyphs[0].pos.y + device_y;
compute_string_bbox(&text_info, &str_bbox);
center.x += (str_bbox.xMax - str_bbox.xMin) / 2;
center.y += (str_bbox.yMax - str_bbox.yMin) / 2;
}
// mp_msg(MSGT_GLOBAL, MSGL_DBG2, "\ncenter: %d, %d\n", center.x, center.y);
for (i = 0; i < text_info.length; ++i) {
glyph_info_t* info = text_info.glyphs + i;
// calculating shift vector
// shift = (position - center)*M - (position - center)
FT_Vector start;
FT_Vector start_old;
// mp_msg(MSGT_GLOBAL, MSGL_INFO, "start: (%d, %d) + (%d, %d) - (%d, %d) = (%d, %d)\n", info->pos.x, info->pos.y, device_x, device_y, center.x, center.y,
// info->pos.x + device_x - center.x, info->pos.y + device_y - center.y);
start.x = (info->pos.x + device_x - center.x) << 6;
start.y = - (info->pos.y + device_y - center.y) << 6;
start_old.x = start.x;
start_old.y = start.y;
// mp_msg(MSGT_GLOBAL, MSGL_INFO, "start: %d, %d\n", start.x / 64, start.y / 64);
FT_Vector_Transform(&start, &matrix_rotate);
start.x -= start_old.x;
start.y -= start_old.y;
info->pos.x += start.x >> 6;
info->pos.y -= start.y >> 6;
// mp_msg(MSGT_GLOBAL, MSGL_DBG2, "shift: %d, %d\n", start.x / 64, start.y / 64);
if (info->bitmap != 1) {
FT_Glyph_Transform( info->glyph, &matrix_rotate, 0 );
FT_Glyph_Transform( info->outline_glyph, &matrix_rotate, 0 );
}
}
}
// render
render_text(&text_info, device_x, device_y);
free_render_context();
return 0;
}
void ass_configure(ass_instance_t* priv, const ass_settings_t* config)
{
memcpy(&priv->settings, config, sizeof(ass_settings_t));
}
/**
* \brief Start a new frame
*/
int ass_start_frame(ass_instance_t *priv, ass_track_t* track, long long now)
{
ass_instance = priv;
global_settings = &priv->settings;
if (!priv->settings.frame_width && !priv->settings.frame_height)
return 1; // library not initialized
frame_context.ass_priv = priv;
frame_context.width = global_settings->frame_width;
frame_context.height = global_settings->frame_height;
frame_context.orig_height = global_settings->frame_height - global_settings->top_margin - global_settings->bottom_margin;
frame_context.track = track;
frame_context.add_bottom_margin = 0;
frame_context.add_top_margin = 0;
frame_context.time = now;
ass_lazy_track_init();
if (frame_context.width * track->PlayResY == frame_context.height * track->PlayResX)
frame_context.font_scale_x = 1.;
else
frame_context.font_scale_x = ((double)(frame_context.width * track->PlayResY)) / (frame_context.height * track->PlayResX);
priv->n_images = 0;
return 0;
}
/**
* \brief End a frame, give out rendering results
* \return list of ass_image_t
*/
ass_image_t* ass_end_frame(void)
{
ass_instance_t* priv = ass_instance;
if (priv->n_images) {
int i;
for (i = 0; i < priv->n_images - 1; ++i)
priv->images_root[i].next = priv->images_root + i + 1;
priv->images_root[priv->n_images - 1].next = 0;
return priv->images_root;
} else {
return 0;
}
}
/**
* \brief render a frame
* \param priv library handle
* \param track track
* \param now current video timestamp (ms)
*/
ass_image_t* ass_render_frame(ass_instance_t *priv, ass_track_t* track, long long now)
{
int i, rc;
rc = ass_start_frame(priv, track, now);
if (rc != 0) // some error
return 0;
for (i = 0; i < track->n_events; ++i) {
ass_event_t* event = track->events + i;
if ( (event->Start <= now) && (now < (event->Start + event->Duration)) ) {
ass_render_event(event);
}
}
return ass_end_frame();
}
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