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Aegisub/aegisub/libass/ass_render.c

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/*
* Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
*
* This file is part of libass.
*
* libass is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* libass is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with libass; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <assert.h>
#include <math.h>
#include <inttypes.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_STROKER_H
#include FT_GLYPH_H
#include FT_SYNTHESIS_H
#include "ass.h"
#include "ass_font.h"
#include "ass_bitmap.h"
#include "ass_cache.h"
#include "ass_utils.h"
#include "ass_fontconfig.h"
#include "ass_library.h"
#include "ass_drawing.h"
#include "ass_render.h"
#include "ass_parse.h"
#define MAX_GLYPHS_INITIAL 1024
#define MAX_LINES_INITIAL 64
#define SUBPIXEL_MASK 63
#define SUBPIXEL_ACCURACY 7 // d6 mask for subpixel accuracy adjustment
#define GLYPH_CACHE_MAX 1000
#define BITMAP_CACHE_MAX_SIZE 50 * 1048576
static void ass_lazy_track_init(ASS_Renderer *render_priv)
{
ASS_Track *track = render_priv->track;
if (track->PlayResX && track->PlayResY)
return;
if (!track->PlayResX && !track->PlayResY) {
ass_msg(render_priv->library, MSGL_WARN,
"Neither PlayResX nor PlayResY defined. Assuming 384x288");
track->PlayResX = 384;
track->PlayResY = 288;
} else {
if (!track->PlayResY && track->PlayResX == 1280) {
track->PlayResY = 1024;
ass_msg(render_priv->library, MSGL_WARN,
"PlayResY undefined, setting to %d", track->PlayResY);
} else if (!track->PlayResY) {
track->PlayResY = track->PlayResX * 3 / 4;
ass_msg(render_priv->library, MSGL_WARN,
"PlayResY undefined, setting to %d", track->PlayResY);
} else if (!track->PlayResX && track->PlayResY == 1024) {
track->PlayResX = 1280;
ass_msg(render_priv->library, MSGL_WARN,
"PlayResX undefined, setting to %d", track->PlayResX);
} else if (!track->PlayResX) {
track->PlayResX = track->PlayResY * 4 / 3;
ass_msg(render_priv->library, MSGL_WARN,
"PlayResX undefined, setting to %d", track->PlayResX);
}
}
}
ASS_Renderer *ass_renderer_init(ASS_Library *library)
{
int error;
FT_Library ft;
ASS_Renderer *priv = 0;
int vmajor, vminor, vpatch;
error = FT_Init_FreeType(&ft);
if (error) {
ass_msg(library, MSGL_FATAL, "%s failed", "FT_Init_FreeType");
goto ass_init_exit;
}
FT_Library_Version(ft, &vmajor, &vminor, &vpatch);
ass_msg(library, MSGL_V, "FreeType library version: %d.%d.%d",
vmajor, vminor, vpatch);
ass_msg(library, MSGL_V, "FreeType headers version: %d.%d.%d",
FREETYPE_MAJOR, FREETYPE_MINOR, FREETYPE_PATCH);
priv = calloc(1, sizeof(ASS_Renderer));
if (!priv) {
FT_Done_FreeType(ft);
goto ass_init_exit;
}
priv->synth_priv = ass_synth_init(BLUR_MAX_RADIUS);
priv->library = library;
priv->ftlibrary = ft;
// images_root and related stuff is zero-filled in calloc
priv->cache.font_cache = ass_font_cache_init(library);
priv->cache.bitmap_cache = ass_bitmap_cache_init(library);
priv->cache.composite_cache = ass_composite_cache_init(library);
priv->cache.glyph_cache = ass_glyph_cache_init(library);
priv->cache.glyph_max = GLYPH_CACHE_MAX;
priv->cache.bitmap_max_size = BITMAP_CACHE_MAX_SIZE;
priv->text_info.max_glyphs = MAX_GLYPHS_INITIAL;
priv->text_info.max_lines = MAX_LINES_INITIAL;
priv->text_info.glyphs =
calloc(MAX_GLYPHS_INITIAL, sizeof(GlyphInfo));
priv->text_info.lines = calloc(MAX_LINES_INITIAL, sizeof(LineInfo));
ass_init_exit:
if (priv)
ass_msg(library, MSGL_INFO, "Init");
else
ass_msg(library, MSGL_ERR, "Init failed");
return priv;
}
void ass_set_cache_limits(ASS_Renderer *render_priv, int glyph_max,
int bitmap_max)
{
render_priv->cache.glyph_max = glyph_max ? glyph_max : GLYPH_CACHE_MAX;
render_priv->cache.bitmap_max_size = bitmap_max ? 1048576 * bitmap_max :
BITMAP_CACHE_MAX_SIZE;
}
static void free_list_clear(ASS_Renderer *render_priv)
{
if (render_priv->free_head) {
FreeList *item = render_priv->free_head;
while(item) {
FreeList *oi = item;
free(item->object);
item = item->next;
free(oi);
}
render_priv->free_head = NULL;
}
}
static void ass_free_images(ASS_Image *img);
void ass_renderer_done(ASS_Renderer *render_priv)
{
ass_font_cache_done(render_priv->cache.font_cache);
ass_bitmap_cache_done(render_priv->cache.bitmap_cache);
ass_composite_cache_done(render_priv->cache.composite_cache);
ass_glyph_cache_done(render_priv->cache.glyph_cache);
ass_free_images(render_priv->images_root);
ass_free_images(render_priv->prev_images_root);
if (render_priv->state.stroker) {
FT_Stroker_Done(render_priv->state.stroker);
render_priv->state.stroker = 0;
}
if (render_priv && render_priv->ftlibrary)
FT_Done_FreeType(render_priv->ftlibrary);
if (render_priv && render_priv->fontconfig_priv)
fontconfig_done(render_priv->fontconfig_priv);
if (render_priv && render_priv->synth_priv)
ass_synth_done(render_priv->synth_priv);
if (render_priv && render_priv->eimg)
free(render_priv->eimg);
free(render_priv->text_info.glyphs);
free(render_priv->text_info.lines);
free(render_priv->settings.default_font);
free(render_priv->settings.default_family);
free_list_clear(render_priv);
free(render_priv);
}
/**
* \brief Create a new ASS_Image
* Parameters are the same as ASS_Image fields.
*/
static ASS_Image *my_draw_bitmap(unsigned char *bitmap, int bitmap_w,
int bitmap_h, int stride, int dst_x,
int dst_y, uint32_t color)
{
ASS_Image *img = calloc(1, sizeof(ASS_Image));
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;
return img;
}
static double x2scr_pos(ASS_Renderer *render_priv, double x);
static double y2scr_pos(ASS_Renderer *render_priv, double y);
/*
* \brief Convert bitmap glyphs into ASS_Image list with inverse clipping
*
* Inverse clipping with the following strategy:
* - find rectangle from (x0, y0) to (cx0, y1)
* - find rectangle from (cx0, y0) to (cx1, cy0)
* - find rectangle from (cx0, cy1) to (cx1, y1)
* - find rectangle from (cx1, y0) to (x1, y1)
* These rectangles can be invalid and in this case are discarded.
* Afterwards, they are clipped against the screen coordinates.
* In an additional pass, the rectangles need to be split up left/right for
* karaoke effects. This can result in a lot of bitmaps (6 to be exact).
*/
static ASS_Image **render_glyph_i(ASS_Renderer *render_priv,
Bitmap *bm, int dst_x, int dst_y,
uint32_t color, uint32_t color2, int brk,
ASS_Image **tail)
{
int i, j, x0, y0, x1, y1, cx0, cy0, cx1, cy1, sx, sy, zx, zy;
Rect r[4];
ASS_Image *img;
dst_x += bm->left;
dst_y += bm->top;
// we still need to clip against screen boundaries
zx = x2scr_pos(render_priv, 0);
zy = y2scr_pos(render_priv, 0);
sx = x2scr_pos(render_priv, render_priv->track->PlayResX);
sy = y2scr_pos(render_priv, render_priv->track->PlayResY);
x0 = 0;
y0 = 0;
x1 = bm->w;
y1 = bm->h;
cx0 = render_priv->state.clip_x0 - dst_x;
cy0 = render_priv->state.clip_y0 - dst_y;
cx1 = render_priv->state.clip_x1 - dst_x;
cy1 = render_priv->state.clip_y1 - dst_y;
// calculate rectangles and discard invalid ones while we're at it.
i = 0;
r[i].x0 = x0;
r[i].y0 = y0;
r[i].x1 = (cx0 > x1) ? x1 : cx0;
r[i].y1 = y1;
if (r[i].x1 > r[i].x0 && r[i].y1 > r[i].y0) i++;
r[i].x0 = (cx0 < 0) ? x0 : cx0;
r[i].y0 = y0;
r[i].x1 = (cx1 > x1) ? x1 : cx1;
r[i].y1 = (cy0 > y1) ? y1 : cy0;
if (r[i].x1 > r[i].x0 && r[i].y1 > r[i].y0) i++;
r[i].x0 = (cx0 < 0) ? x0 : cx0;
r[i].y0 = (cy1 < 0) ? y0 : cy1;
r[i].x1 = (cx1 > x1) ? x1 : cx1;
r[i].y1 = y1;
if (r[i].x1 > r[i].x0 && r[i].y1 > r[i].y0) i++;
r[i].x0 = (cx1 < 0) ? x0 : cx1;
r[i].y0 = y0;
r[i].x1 = x1;
r[i].y1 = y1;
if (r[i].x1 > r[i].x0 && r[i].y1 > r[i].y0) i++;
// clip each rectangle to screen coordinates
for (j = 0; j < i; j++) {
r[j].x0 = (r[j].x0 + dst_x < zx) ? zx - dst_x : r[j].x0;
r[j].y0 = (r[j].y0 + dst_y < zy) ? zy - dst_y : r[j].y0;
r[j].x1 = (r[j].x1 + dst_x > sx) ? sx - dst_x : r[j].x1;
r[j].y1 = (r[j].y1 + dst_y > sy) ? sy - dst_y : r[j].y1;
}
// draw the rectangles
for (j = 0; j < i; j++) {
int lbrk = brk;
// kick out rectangles that are invalid now
if (r[j].x1 <= r[j].x0 || r[j].y1 <= r[j].y0)
continue;
// split up into left and right for karaoke, if needed
if (lbrk > r[j].x0) {
if (lbrk > r[j].x1) lbrk = r[j].x1;
img = my_draw_bitmap(bm->buffer + r[j].y0 * bm->w + r[j].x0,
lbrk - r[j].x0, r[j].y1 - r[j].y0,
bm->w, dst_x + r[j].x0, dst_y + r[j].y0, color);
*tail = img;
tail = &img->next;
}
if (lbrk < r[j].x1) {
if (lbrk < r[j].x0) lbrk = r[j].x0;
img = my_draw_bitmap(bm->buffer + r[j].y0 * bm->w + lbrk,
r[j].x1 - lbrk, r[j].y1 - r[j].y0,
bm->w, dst_x + lbrk, dst_y + r[j].y0, color2);
*tail = img;
tail = &img->next;
}
}
return tail;
}
/**
* \brief convert bitmap glyph into ASS_Image 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
* \param tail pointer to the last image's next field, head of the generated list should be stored here
* \return pointer to the new list tail
* Performs clipping. Uses my_draw_bitmap for actual bitmap convertion.
*/
static ASS_Image **
render_glyph(ASS_Renderer *render_priv, Bitmap *bm, int dst_x, int dst_y,
uint32_t color, uint32_t color2, int brk, ASS_Image **tail)
{
// Inverse clipping in use?
if (render_priv->state.clip_mode)
return render_glyph_i(render_priv, bm, dst_x, dst_y, color, color2,
brk, tail);
// 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;
ASS_Image *img;
dst_x += bm->left;
dst_y += bm->top;
brk -= bm->left;
// clipping
clip_x0 = FFMINMAX(render_priv->state.clip_x0, 0, render_priv->width);
clip_y0 = FFMINMAX(render_priv->state.clip_y0, 0, render_priv->height);
clip_x1 = FFMINMAX(render_priv->state.clip_x1, 0, render_priv->width);
clip_y1 = FFMINMAX(render_priv->state.clip_y1, 0, render_priv->height);
b_x0 = 0;
b_y0 = 0;
b_x1 = bm->w;
b_y1 = bm->h;
tmp = dst_x - clip_x0;
if (tmp < 0) {
ass_msg(render_priv->library, MSGL_DBG2, "clip left");
b_x0 = -tmp;
}
tmp = dst_y - clip_y0;
if (tmp < 0) {
ass_msg(render_priv->library, MSGL_DBG2, "clip top");
b_y0 = -tmp;
}
tmp = clip_x1 - dst_x - bm->w;
if (tmp < 0) {
ass_msg(render_priv->library, MSGL_DBG2, "clip right");
b_x1 = bm->w + tmp;
}
tmp = clip_y1 - dst_y - bm->h;
if (tmp < 0) {
ass_msg(render_priv->library, MSGL_DBG2, "clip bottom");
b_y1 = bm->h + tmp;
}
if ((b_y0 >= b_y1) || (b_x0 >= b_x1))
return tail;
if (brk > b_x0) { // draw left part
if (brk > b_x1)
brk = b_x1;
img = my_draw_bitmap(bm->buffer + bm->w * b_y0 + b_x0,
brk - b_x0, b_y1 - b_y0, bm->w,
dst_x + b_x0, dst_y + b_y0, color);
*tail = img;
tail = &img->next;
}
if (brk < b_x1) { // draw right part
if (brk < b_x0)
brk = b_x0;
img = my_draw_bitmap(bm->buffer + bm->w * b_y0 + brk,
b_x1 - brk, b_y1 - b_y0, bm->w,
dst_x + brk, dst_y + b_y0, color2);
*tail = img;
tail = &img->next;
}
return tail;
}
/**
* \brief Replace the bitmap buffer in ASS_Image with a copy
* \param img ASS_Image to operate on
* \return pointer to old bitmap buffer
*/
static unsigned char *clone_bitmap_buffer(ASS_Image *img)
{
unsigned char *old_bitmap = img->bitmap;
int size = img->stride * (img->h - 1) + img->w;
img->bitmap = malloc(size);
memcpy(img->bitmap, old_bitmap, size);
return old_bitmap;
}
/**
* \brief Calculate overlapping area of two consecutive bitmaps and in case they
* overlap, blend them together
* Mainly useful for translucent glyphs and especially borders, to avoid the
* luminance adding up where they overlap (which looks ugly)
*/
static void
render_overlap(ASS_Renderer *render_priv, ASS_Image **last_tail,
ASS_Image **tail)
{
int left, top, bottom, right;
int old_left, old_top, w, h, cur_left, cur_top;
int x, y, opos, cpos;
char m;
CompositeHashKey hk;
CompositeHashValue *hv;
CompositeHashValue chv;
int ax = (*last_tail)->dst_x;
int ay = (*last_tail)->dst_y;
int aw = (*last_tail)->w;
int as = (*last_tail)->stride;
int ah = (*last_tail)->h;
int bx = (*tail)->dst_x;
int by = (*tail)->dst_y;
int bw = (*tail)->w;
int bs = (*tail)->stride;
int bh = (*tail)->h;
unsigned char *a;
unsigned char *b;
if ((*last_tail)->bitmap == (*tail)->bitmap)
return;
if ((*last_tail)->color != (*tail)->color)
return;
// Calculate overlap coordinates
left = (ax > bx) ? ax : bx;
top = (ay > by) ? ay : by;
right = ((ax + aw) < (bx + bw)) ? (ax + aw) : (bx + bw);
bottom = ((ay + ah) < (by + bh)) ? (ay + ah) : (by + bh);
if ((right <= left) || (bottom <= top))
return;
old_left = left - ax;
old_top = top - ay;
w = right - left;
h = bottom - top;
cur_left = left - bx;
cur_top = top - by;
// Query cache
memset(&hk, 0, sizeof(hk));
hk.a = (*last_tail)->bitmap;
hk.b = (*tail)->bitmap;
hk.aw = aw;
hk.ah = ah;
hk.bw = bw;
hk.bh = bh;
hk.ax = ax;
hk.ay = ay;
hk.bx = bx;
hk.by = by;
hk.as = as;
hk.bs = bs;
hv = cache_find_composite(render_priv->cache.composite_cache, &hk);
if (hv) {
(*last_tail)->bitmap = hv->a;
(*tail)->bitmap = hv->b;
return;
}
// Allocate new bitmaps and copy over data
a = clone_bitmap_buffer(*last_tail);
b = clone_bitmap_buffer(*tail);
// Blend overlapping area
for (y = 0; y < h; y++)
for (x = 0; x < w; x++) {
opos = (old_top + y) * (as) + (old_left + x);
cpos = (cur_top + y) * (bs) + (cur_left + x);
m = FFMIN(a[opos] + b[cpos], 0xff);
(*last_tail)->bitmap[opos] = 0;
(*tail)->bitmap[cpos] = m;
}
// Insert bitmaps into the cache
chv.a = (*last_tail)->bitmap;
chv.b = (*tail)->bitmap;
cache_add_composite(render_priv->cache.composite_cache, &hk, &chv);
}
static void free_list_add(ASS_Renderer *render_priv, void *object)
{
if (!render_priv->free_head) {
render_priv->free_head = calloc(1, sizeof(FreeList));
render_priv->free_head->object = object;
render_priv->free_tail = render_priv->free_head;
} else {
FreeList *l = calloc(1, sizeof(FreeList));
l->object = object;
render_priv->free_tail->next = l;
render_priv->free_tail = render_priv->free_tail->next;
}
}
/**
* Iterate through a list of bitmaps and blend with clip vector, if
* applicable. The blended bitmaps are added to a free list which is freed
* at the start of a new frame.
*/
static void blend_vector_clip(ASS_Renderer *render_priv,
ASS_Image *head)
{
FT_Glyph glyph;
FT_BitmapGlyph clip_bm;
ASS_Image *cur;
ASS_Drawing *drawing = render_priv->state.clip_drawing;
int error;
if (!drawing)
return;
// Rasterize it
FT_Glyph_Copy((FT_Glyph) drawing->glyph, &glyph);
error = FT_Glyph_To_Bitmap(&glyph, FT_RENDER_MODE_NORMAL, 0, 1);
if (error) {
ass_msg(render_priv->library, MSGL_V,
"Clip vector rasterization failed: %d. Skipping.", error);
goto blend_vector_exit;
}
clip_bm = (FT_BitmapGlyph) glyph;
clip_bm->top = -clip_bm->top;
assert(clip_bm->bitmap.pitch >= 0);
// Iterate through bitmaps and blend/clip them
for (cur = head; cur; cur = cur->next) {
int left, top, right, bottom, apos, bpos, y, x, w, h;
int ax, ay, aw, ah, as;
int bx, by, bw, bh, bs;
int aleft, atop, bleft, btop;
unsigned char *abuffer, *bbuffer, *nbuffer;
abuffer = cur->bitmap;
bbuffer = clip_bm->bitmap.buffer;
ax = cur->dst_x;
ay = cur->dst_y;
aw = cur->w;
ah = cur->h;
as = cur->stride;
bx = clip_bm->left;
by = clip_bm->top;
bw = clip_bm->bitmap.width;
bh = clip_bm->bitmap.rows;
bs = clip_bm->bitmap.pitch;
// Calculate overlap coordinates
left = (ax > bx) ? ax : bx;
top = (ay > by) ? ay : by;
right = ((ax + aw) < (bx + bw)) ? (ax + aw) : (bx + bw);
bottom = ((ay + ah) < (by + bh)) ? (ay + ah) : (by + bh);
aleft = left - ax;
atop = top - ay;
w = right - left;
h = bottom - top;
bleft = left - bx;
btop = top - by;
if (render_priv->state.clip_drawing_mode) {
// Inverse clip
if (ax + aw < bx || ay + ah < by || ax > bx + bw ||
ay > by + bh) {
continue;
}
// Allocate new buffer and add to free list
nbuffer = malloc(as * ah);
free_list_add(render_priv, nbuffer);
// Blend together
memcpy(nbuffer, abuffer, as * (ah - 1) + aw);
for (y = 0; y < h; y++)
for (x = 0; x < w; x++) {
apos = (atop + y) * as + aleft + x;
bpos = (btop + y) * bs + bleft + x;
nbuffer[apos] = FFMAX(0, abuffer[apos] - bbuffer[bpos]);
}
} else {
// Regular clip
if (ax + aw < bx || ay + ah < by || ax > bx + bw ||
ay > by + bh) {
cur->w = cur->h = 0;
continue;
}
// Allocate new buffer and add to free list
nbuffer = calloc(as, ah);
free_list_add(render_priv, nbuffer);
// Blend together
for (y = 0; y < h; y++)
for (x = 0; x < w; x++) {
apos = (atop + y) * as + aleft + x;
bpos = (btop + y) * bs + bleft + x;
nbuffer[apos] = (abuffer[apos] * bbuffer[bpos] + 255) >> 8;
}
}
cur->bitmap = nbuffer;
}
// Free clip vector and its bitmap, we don't need it anymore
FT_Done_Glyph(glyph);
blend_vector_exit:
ass_drawing_free(render_priv->state.clip_drawing);
render_priv->state.clip_drawing = 0;
}
/**
* \brief Convert TextInfo struct to ASS_Image list
* Splits glyphs in halves when needed (for \kf karaoke).
*/
static ASS_Image *render_text(ASS_Renderer *render_priv, int dst_x,
int dst_y)
{
int pen_x, pen_y;
int i;
Bitmap *bm;
ASS_Image *head;
ASS_Image **tail = &head;
ASS_Image **last_tail = 0;
ASS_Image **here_tail = 0;
TextInfo *text_info = &render_priv->text_info;
for (i = 0; i < text_info->length; ++i) {
GlyphInfo *info = text_info->glyphs + i;
if ((info->symbol == 0) || (info->symbol == '\n') || !info->bm_s
|| (info->shadow_x == 0 && info->shadow_y == 0) || info->skip)
continue;
pen_x =
dst_x + (info->pos.x >> 6) +
(int) (info->shadow_x * render_priv->border_scale);
pen_y =
dst_y + (info->pos.y >> 6) +
(int) (info->shadow_y * render_priv->border_scale);
bm = info->bm_s;
here_tail = tail;
tail =
render_glyph(render_priv, bm, pen_x, pen_y, info->c[3], 0,
1000000, tail);
if (last_tail && tail != here_tail && ((info->c[3] & 0xff) > 0))
render_overlap(render_priv, last_tail, here_tail);
last_tail = here_tail;
}
last_tail = 0;
for (i = 0; i < text_info->length; ++i) {
GlyphInfo *info = text_info->glyphs + i;
if ((info->symbol == 0) || (info->symbol == '\n') || !info->bm_o
|| info->skip)
continue;
pen_x = dst_x + (info->pos.x >> 6);
pen_y = dst_y + (info->pos.y >> 6);
bm = info->bm_o;
if ((info->effect_type == EF_KARAOKE_KO)
&& (info->effect_timing <= (info->bbox.xMax >> 6))) {
// do nothing
} else {
here_tail = tail;
tail =
render_glyph(render_priv, bm, pen_x, pen_y, info->c[2],
0, 1000000, tail);
if (last_tail && tail != here_tail && ((info->c[2] & 0xff) > 0))
render_overlap(render_priv, last_tail, here_tail);
last_tail = here_tail;
}
}
for (i = 0; i < text_info->length; ++i) {
GlyphInfo *info = text_info->glyphs + i;
if ((info->symbol == 0) || (info->symbol == '\n') || !info->bm
|| info->skip)
continue;
pen_x = dst_x + (info->pos.x >> 6);
pen_y = dst_y + (info->pos.y >> 6);
bm = info->bm;
if ((info->effect_type == EF_KARAOKE)
|| (info->effect_type == EF_KARAOKE_KO)) {
if (info->effect_timing > (info->bbox.xMax >> 6))
tail =
render_glyph(render_priv, bm, pen_x, pen_y,
info->c[0], 0, 1000000, tail);
else
tail =
render_glyph(render_priv, bm, pen_x, pen_y,
info->c[1], 0, 1000000, tail);
} else if (info->effect_type == EF_KARAOKE_KF) {
tail =
render_glyph(render_priv, bm, pen_x, pen_y, info->c[0],
info->c[1], info->effect_timing, tail);
} else
tail =
render_glyph(render_priv, bm, pen_x, pen_y, info->c[0],
0, 1000000, tail);
}
*tail = 0;
blend_vector_clip(render_priv, head);
return head;
}
/**
* \brief Mapping between script and screen coordinates
*/
static double x2scr(ASS_Renderer *render_priv, double x)
{
return x * render_priv->orig_width_nocrop /
render_priv->track->PlayResX +
FFMAX(render_priv->settings.left_margin, 0);
}
static double x2scr_pos(ASS_Renderer *render_priv, double x)
{
return x * render_priv->orig_width / render_priv->track->PlayResX +
render_priv->settings.left_margin;
}
/**
* \brief Mapping between script and screen coordinates
*/
static double y2scr(ASS_Renderer *render_priv, double y)
{
return y * render_priv->orig_height_nocrop /
render_priv->track->PlayResY +
FFMAX(render_priv->settings.top_margin, 0);
}
static double y2scr_pos(ASS_Renderer *render_priv, double y)
{
return y * render_priv->orig_height / render_priv->track->PlayResY +
render_priv->settings.top_margin;
}
// the same for toptitles
static double y2scr_top(ASS_Renderer *render_priv, double y)
{
if (render_priv->settings.use_margins)
return y * render_priv->orig_height_nocrop /
render_priv->track->PlayResY;
else
return y * render_priv->orig_height_nocrop /
render_priv->track->PlayResY +
FFMAX(render_priv->settings.top_margin, 0);
}
// the same for subtitles
static double y2scr_sub(ASS_Renderer *render_priv, double y)
{
if (render_priv->settings.use_margins)
return y * render_priv->orig_height_nocrop /
render_priv->track->PlayResY +
FFMAX(render_priv->settings.top_margin,
0) + FFMAX(render_priv->settings.bottom_margin, 0);
else
return y * render_priv->orig_height_nocrop /
render_priv->track->PlayResY +
FFMAX(render_priv->settings.top_margin, 0);
}
static void compute_string_bbox(TextInfo *info, DBBox *bbox)
{
int i;
if (info->length > 0) {
bbox->xMin = 32000;
bbox->xMax = -32000;
bbox->yMin = -1 * info->lines[0].asc + d6_to_double(info->glyphs[0].pos.y);
bbox->yMax = info->height - info->lines[0].asc +
d6_to_double(info->glyphs[0].pos.y);
for (i = 0; i < info->length; ++i) {
if (info->glyphs[i].skip) continue;
double s = d6_to_double(info->glyphs[i].pos.x);
double e = s + d6_to_double(info->glyphs[i].advance.x);
bbox->xMin = FFMIN(bbox->xMin, s);
bbox->xMax = FFMAX(bbox->xMax, e);
}
} else
bbox->xMin = bbox->xMax = bbox->yMin = bbox->yMax = 0.;
}
static 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 partially reset render_context to style values
* Works like {\r}: resets some style overrides
*/
void reset_render_context(ASS_Renderer *render_priv)
{
render_priv->state.c[0] = render_priv->state.style->PrimaryColour;
render_priv->state.c[1] = render_priv->state.style->SecondaryColour;
render_priv->state.c[2] = render_priv->state.style->OutlineColour;
render_priv->state.c[3] = render_priv->state.style->BackColour;
render_priv->state.flags =
(render_priv->state.style->Underline ? DECO_UNDERLINE : 0) |
(render_priv->state.style->StrikeOut ? DECO_STRIKETHROUGH : 0);
render_priv->state.font_size = render_priv->state.style->FontSize;
free(render_priv->state.family);
render_priv->state.family = NULL;
render_priv->state.family = strdup(render_priv->state.style->FontName);
render_priv->state.treat_family_as_pattern =
render_priv->state.style->treat_fontname_as_pattern;
render_priv->state.bold = render_priv->state.style->Bold;
render_priv->state.italic = render_priv->state.style->Italic;
update_font(render_priv);
change_border(render_priv, -1., -1.);
render_priv->state.scale_x = render_priv->state.style->ScaleX;
render_priv->state.scale_y = render_priv->state.style->ScaleY;
render_priv->state.hspacing = render_priv->state.style->Spacing;
render_priv->state.be = 0;
render_priv->state.blur = 0.0;
render_priv->state.shadow_x = render_priv->state.style->Shadow;
render_priv->state.shadow_y = render_priv->state.style->Shadow;
render_priv->state.frx = render_priv->state.fry = 0.;
render_priv->state.frz = M_PI * render_priv->state.style->Angle / 180.;
render_priv->state.fax = render_priv->state.fay = 0.;
render_priv->state.wrap_style = render_priv->track->WrapStyle;
// FIXME: does not reset unsupported attributes.
}
/**
* \brief Start new event. Reset render_priv->state.
*/
static void
init_render_context(ASS_Renderer *render_priv, ASS_Event *event)
{
render_priv->state.event = event;
render_priv->state.style = render_priv->track->styles + event->Style;
reset_render_context(render_priv);
render_priv->state.evt_type = EVENT_NORMAL;
render_priv->state.alignment = render_priv->state.style->Alignment;
render_priv->state.pos_x = 0;
render_priv->state.pos_y = 0;
render_priv->state.org_x = 0;
render_priv->state.org_y = 0;
render_priv->state.have_origin = 0;
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;
render_priv->state.detect_collisions = 1;
render_priv->state.fade = 0;
render_priv->state.drawing_mode = 0;
render_priv->state.effect_type = EF_NONE;
render_priv->state.effect_timing = 0;
render_priv->state.effect_skip_timing = 0;
render_priv->state.drawing =
ass_drawing_new(render_priv->fontconfig_priv,
render_priv->state.font,
render_priv->settings.hinting,
render_priv->ftlibrary);
apply_transition_effects(render_priv, event);
}
static void free_render_context(ASS_Renderer *render_priv)
{
free(render_priv->state.family);
ass_drawing_free(render_priv->state.drawing);
render_priv->state.family = NULL;
render_priv->state.drawing = NULL;
}
// Calculate the cbox of a series of points
static void
get_contour_cbox(FT_BBox *box, FT_Vector *points, int start, int end)
{
box->xMin = box->yMin = INT_MAX;
box->xMax = box->yMax = INT_MIN;
int i;
for (i = start; i < end; i++) {
box->xMin = (points[i].x < box->xMin) ? points[i].x : box->xMin;
box->xMax = (points[i].x > box->xMax) ? points[i].x : box->xMax;
box->yMin = (points[i].y < box->yMin) ? points[i].y : box->yMin;
box->yMax = (points[i].y > box->yMax) ? points[i].y : box->yMax;
}
}
/**
* \brief Fix-up stroker result for huge borders by removing the contours from
* the outline that are harmful.
*/
static void fix_freetype_stroker(FT_OutlineGlyph glyph, int border_x,
int border_y)
{
int nc = glyph->outline.n_contours;
int begin, stop;
char modified = 0;
char *valid_cont;
int start = 0;
int end = -1;
FT_BBox *boxes = calloc(nc, sizeof(FT_BBox));
int i, j;
// Create a list of cboxes of the contours
for (i = 0; i < nc; i++) {
start = end + 1;
end = glyph->outline.contours[i];
get_contour_cbox(&boxes[i], glyph->outline.points, start, end);
}
// if a) contour's cbox is contained in another contours cbox
// b) contour's height or width is smaller than the border*2
// the contour can be safely removed.
valid_cont = calloc(1, nc);
for (i = 0; i < nc; i++) {
valid_cont[i] = 1;
for (j = 0; j < nc; j++) {
if (i == j)
continue;
if (boxes[i].xMin >= boxes[j].xMin &&
boxes[i].xMax <= boxes[j].xMax &&
boxes[i].yMin >= boxes[j].yMin &&
boxes[i].yMax <= boxes[j].yMax) {
int width = boxes[i].xMax - boxes[i].xMin;
int height = boxes[i].yMax - boxes[i].yMin;
if (width < border_x * 2 || height < border_y * 2) {
valid_cont[i] = 0;
modified = 1;
break;
}
}
}
}
// Zero-out contours that can be removed; much simpler than copying
if (modified) {
for (i = 0; i < nc; i++) {
if (valid_cont[i])
continue;
begin = (i == 0) ? 0 : glyph->outline.contours[i - 1] + 1;
stop = glyph->outline.contours[i];
for (j = begin; j <= stop; j++) {
glyph->outline.points[j].x = 0;
glyph->outline.points[j].y = 0;
glyph->outline.tags[j] = 0;
}
}
}
free(boxes);
free(valid_cont);
}
/*
* Replace the outline of a glyph by a contour which makes up a simple
* opaque rectangle.
*/
static void draw_opaque_box(ASS_Renderer *render_priv, uint32_t ch,
FT_Glyph glyph, int sx, int sy)
{
int asc = 0, desc = 0;
int i;
int adv = d16_to_d6(glyph->advance.x);
double scale_y = render_priv->state.scale_y;
double scale_x = render_priv->state.scale_x
* render_priv->font_scale_x;
FT_OutlineGlyph og = (FT_OutlineGlyph) glyph;
FT_Outline *ol;
// to avoid gaps
sx = FFMAX(64, sx);
sy = FFMAX(64, sy);
if (ch == -1) {
asc = render_priv->state.drawing->asc;
desc = render_priv->state.drawing->desc;
} else {
ass_font_get_asc_desc(render_priv->state.font, ch, &asc, &desc);
asc *= scale_y;
desc *= scale_y;
}
// Emulate the WTFish behavior of VSFilter, i.e. double-scale
// the sizes of the opaque box.
adv += double_to_d6(render_priv->state.hspacing * render_priv->font_scale
* scale_x);
adv *= scale_x;
sx *= scale_x;
sy *= scale_y;
desc *= scale_y;
desc += asc * (scale_y - 1.0);
FT_Vector points[4] = {
{ .x = -sx, .y = asc + sy },
{ .x = adv + sx, .y = asc + sy },
{ .x = adv + sx, .y = -desc - sy },
{ .x = -sx, .y = -desc - sy },
};
FT_Outline_Done(render_priv->ftlibrary, &og->outline);
FT_Outline_New(render_priv->ftlibrary, 4, 1, &og->outline);
ol = &og->outline;
ol->n_points = ol->n_contours = 0;
for (i = 0; i < 4; i++) {
ol->points[ol->n_points] = points[i];
ol->tags[ol->n_points++] = 1;
}
ol->contours[ol->n_contours++] = ol->n_points - 1;
}
/*
* Stroke an outline glyph in x/y direction. Applies various fixups to get
* around limitations of the FreeType stroker.
*/
static void stroke_outline_glyph(ASS_Renderer *render_priv,
FT_OutlineGlyph *glyph, int sx, int sy)
{
if (sx <= 0 && sy <= 0)
return;
fix_freetype_stroker(*glyph, sx, sy);
// Borders are equal; use the regular stroker
if (sx == sy && render_priv->state.stroker) {
int error;
error = FT_Glyph_StrokeBorder((FT_Glyph *) glyph,
render_priv->state.stroker, 0, 1);
if (error)
ass_msg(render_priv->library, MSGL_WARN,
"FT_Glyph_Stroke error: %d", error);
// "Stroke" with the outline emboldener in two passes.
// The outlines look uglier, but the emboldening never adds any points
} else {
int i;
FT_Outline *ol = &(*glyph)->outline;
FT_Outline nol;
FT_Outline_New(render_priv->ftlibrary, ol->n_points,
ol->n_contours, &nol);
FT_Outline_Copy(ol, &nol);
FT_Outline_Embolden(ol, sx * 2);
FT_Outline_Translate(ol, -sx, -sx);
FT_Outline_Embolden(&nol, sy * 2);
FT_Outline_Translate(&nol, -sy, -sy);
for (i = 0; i < ol->n_points; i++)
ol->points[i].y = nol.points[i].y;
FT_Outline_Done(render_priv->ftlibrary, &nol);
}
}
/**
* \brief Get normal and outline (border) glyphs
* \param symbol ucs4 char
* \param info out: struct filled with extracted data
* Tries to get both glyphs from cache.
* If they can't be found, gets a glyph from font face, generates outline with FT_Stroker,
* and add them to cache.
* The glyphs are returned in info->glyph and info->outline_glyph
*/
static void
get_outline_glyph(ASS_Renderer *render_priv, int symbol, GlyphInfo *info,
ASS_Drawing *drawing)
{
GlyphHashValue *val;
GlyphHashKey key;
memset(&key, 0, sizeof(key));
if (drawing->hash) {
key.scale_x = double_to_d16(render_priv->state.scale_x);
key.scale_y = double_to_d16(render_priv->state.scale_y);
key.outline.x = render_priv->state.border_x * 0xFFFF;
key.outline.y = render_priv->state.border_y * 0xFFFF;
key.border_style = render_priv->state.style->BorderStyle;
key.drawing_hash = drawing->hash;
} else {
key.font = render_priv->state.font;
key.size = render_priv->state.font_size;
key.ch = symbol;
key.bold = render_priv->state.bold;
key.italic = render_priv->state.italic;
key.scale_x = double_to_d16(render_priv->state.scale_x);
key.scale_y = double_to_d16(render_priv->state.scale_y);
key.outline.x = render_priv->state.border_x * 0xFFFF;
key.outline.y = render_priv->state.border_y * 0xFFFF;
key.flags = render_priv->state.flags;
key.border_style = render_priv->state.style->BorderStyle;
}
memset(info, 0, sizeof(GlyphInfo));
val = cache_find_glyph(render_priv->cache.glyph_cache, &key);
if (val) {
FT_Glyph_Copy(val->glyph, &info->glyph);
if (val->outline_glyph)
FT_Glyph_Copy(val->outline_glyph, &info->outline_glyph);
info->bbox = val->bbox_scaled;
info->advance.x = val->advance.x;
info->advance.y = val->advance.y;
if (drawing->hash) {
drawing->asc = val->asc;
drawing->desc = val->desc;
}
} else {
GlyphHashValue v;
if (drawing->hash) {
ass_drawing_parse(drawing, 0);
FT_Glyph_Copy((FT_Glyph) drawing->glyph, &info->glyph);
} else {
info->glyph =
ass_font_get_glyph(render_priv->fontconfig_priv,
render_priv->state.font, symbol,
render_priv->settings.hinting,
render_priv->state.flags);
}
if (!info->glyph)
return;
info->advance.x = d16_to_d6(info->glyph->advance.x);
info->advance.y = d16_to_d6(info->glyph->advance.y);
FT_Glyph_Get_CBox(info->glyph, FT_GLYPH_BBOX_SUBPIXELS, &info->bbox);
if (render_priv->state.style->BorderStyle == 3 &&
(render_priv->state.border_x > 0||
render_priv->state.border_y > 0)) {
FT_Glyph_Copy(info->glyph, &info->outline_glyph);
draw_opaque_box(render_priv, symbol, info->outline_glyph,
double_to_d6(render_priv->state.border_x *
render_priv->border_scale),
double_to_d6(render_priv->state.border_y *
render_priv->border_scale));
} else if (render_priv->state.border_x > 0 ||
render_priv->state.border_y > 0) {
FT_Glyph_Copy(info->glyph, &info->outline_glyph);
stroke_outline_glyph(render_priv,
(FT_OutlineGlyph *) &info->outline_glyph,
double_to_d6(render_priv->state.border_x *
render_priv->border_scale),
double_to_d6(render_priv->state.border_y *
render_priv->border_scale));
}
memset(&v, 0, sizeof(v));
FT_Glyph_Copy(info->glyph, &v.glyph);
if (info->outline_glyph)
FT_Glyph_Copy(info->outline_glyph, &v.outline_glyph);
v.advance = info->advance;
v.bbox_scaled = info->bbox;
if (drawing->hash) {
v.asc = drawing->asc;
v.desc = drawing->desc;
}
cache_add_glyph(render_priv->cache.glyph_cache, &key, &v);
}
}
static void transform_3d(FT_Vector shift, FT_Glyph *glyph,
FT_Glyph *glyph2, double frx, double fry,
double frz, double fax, double fay, double scale,
int yshift);
/**
* \brief Get bitmaps for a glyph
* \param info glyph info
* Tries to get glyph bitmaps from bitmap cache.
* If they can't be found, they are generated by rotating and rendering the glyph.
* After that, bitmaps are added to the cache.
* They are returned in info->bm (glyph), info->bm_o (outline) and info->bm_s (shadow).
*/
static void
get_bitmap_glyph(ASS_Renderer *render_priv, GlyphInfo *info)
{
BitmapHashValue *val;
BitmapHashKey *key = &info->hash_key;
val = cache_find_bitmap(render_priv->cache.bitmap_cache, key);
if (val) {
info->bm = val->bm;
info->bm_o = val->bm_o;
info->bm_s = val->bm_s;
} else {
FT_Vector shift;
BitmapHashValue hash_val;
int error;
double fax_scaled, fay_scaled;
info->bm = info->bm_o = info->bm_s = 0;
if (info->glyph && info->symbol != '\n' && info->symbol != 0
&& !info->skip) {
// calculating rotation shift vector (from rotation origin to the glyph basepoint)
shift.x = info->hash_key.shift_x;
shift.y = info->hash_key.shift_y;
fax_scaled = info->fax * render_priv->font_scale_x *
render_priv->state.scale_x;
fay_scaled = info->fay * render_priv->state.scale_y;
// apply rotation
transform_3d(shift, &info->glyph, &info->outline_glyph,
info->frx, info->fry, info->frz, fax_scaled,
fay_scaled, render_priv->font_scale, info->asc);
// subpixel shift
if (info->glyph)
FT_Outline_Translate(
&((FT_OutlineGlyph) info->glyph)->outline,
info->hash_key.advance.x,
-info->hash_key.advance.y);
if (info->outline_glyph)
FT_Outline_Translate(
&((FT_OutlineGlyph) info->outline_glyph)->outline,
info->hash_key.advance.x,
-info->hash_key.advance.y);
// render glyph
error = glyph_to_bitmap(render_priv->library,
render_priv->synth_priv,
info->glyph, info->outline_glyph,
&info->bm, &info->bm_o,
&info->bm_s, info->be,
info->blur * render_priv->border_scale,
info->hash_key.shadow_offset,
info->hash_key.border_style);
if (error)
info->symbol = 0;
// add bitmaps to cache
hash_val.bm_o = info->bm_o;
hash_val.bm = info->bm;
hash_val.bm_s = info->bm_s;
cache_add_bitmap(render_priv->cache.bitmap_cache,
&(info->hash_key), &hash_val);
}
}
// deallocate glyphs
if (info->glyph)
FT_Done_Glyph(info->glyph);
if (info->outline_glyph)
FT_Done_Glyph(info->outline_glyph);
}
/**
* This function goes through text_info and calculates text parameters.
* The following text_info fields are filled:
* height
* lines[].height
* lines[].asc
* lines[].desc
*/
static void measure_text(ASS_Renderer *render_priv)
{
TextInfo *text_info = &render_priv->text_info;
int cur_line = 0;
double max_asc = 0., max_desc = 0.;
GlyphInfo *last = NULL;
int i;
int empty_line = 1;
text_info->height = 0.;
for (i = 0; i < text_info->length + 1; ++i) {
if ((i == text_info->length) || text_info->glyphs[i].linebreak) {
if (empty_line && cur_line > 0 && last && i < text_info->length) {
max_asc = d6_to_double(last->asc) / 2.0;
max_desc = d6_to_double(last->desc) / 2.0;
}
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.;
empty_line = 1;
} else
empty_line = 0;
if (i < text_info->length) {
GlyphInfo *cur = text_info->glyphs + i;
if (d6_to_double(cur->asc) > max_asc)
max_asc = d6_to_double(cur->asc);
if (d6_to_double(cur->desc) > max_desc)
max_desc = d6_to_double(cur->desc);
if (cur->symbol != '\n' && cur->symbol != 0)
last = cur;
}
}
text_info->height +=
(text_info->n_lines -
1) * render_priv->settings.line_spacing;
}
/**
* Mark extra whitespace for later removal.
*/
#define IS_WHITESPACE(x) ((x->symbol == ' ' || x->symbol == '\n') \
&& !x->linebreak)
static void trim_whitespace(ASS_Renderer *render_priv)
{
int i, j;
GlyphInfo *cur;
TextInfo *ti = &render_priv->text_info;
// Mark trailing spaces
i = ti->length - 1;
cur = ti->glyphs + i;
while (i && IS_WHITESPACE(cur)) {
cur->skip++;
cur = ti->glyphs + --i;
}
// Mark leading whitespace
i = 0;
cur = ti->glyphs;
while (i < ti->length && IS_WHITESPACE(cur)) {
cur->skip++;
cur = ti->glyphs + ++i;
}
// Mark all extraneous whitespace inbetween
for (i = 0; i < ti->length; ++i) {
cur = ti->glyphs + i;
if (cur->linebreak) {
// Mark whitespace before
j = i - 1;
cur = ti->glyphs + j;
while (j && IS_WHITESPACE(cur)) {
cur->skip++;
cur = ti->glyphs + --j;
}
// A break itself can contain a whitespace, too
cur = ti->glyphs + i;
if (cur->symbol == ' ')
cur->skip++;
// Mark whitespace after
j = i + 1;
cur = ti->glyphs + j;
while (j < ti->length && IS_WHITESPACE(cur)) {
cur->skip++;
cur = ti->glyphs + ++j;
}
i = j - 1;
}
}
}
#undef IS_WHITESPACE
/**
* \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.
*
* FIXME: implement style 0 and 3 correctly, add support for style 1
*/
static void
wrap_lines_smart(ASS_Renderer *render_priv, double max_text_width)
{
int i;
GlyphInfo *cur, *s1, *e1, *s2, *s3, *w;
int last_space;
int break_type;
int exit;
double pen_shift_x;
double pen_shift_y;
int cur_line;
TextInfo *text_info = &render_priv->text_info;
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) {
int break_at;
double s_offset, len;
cur = text_info->glyphs + i;
break_at = -1;
s_offset = d6_to_double(s1->bbox.xMin + s1->pos.x);
len = d6_to_double(cur->bbox.xMax + cur->pos.x) - s_offset;
if (cur->symbol == '\n') {
break_type = 2;
break_at = i;
ass_msg(render_priv->library, MSGL_DBG2,
"forced line break at %d", break_at);
}
if ((len >= max_text_width)
&& (render_priv->state.wrap_style != 2)) {
break_type = 1;
break_at = last_space;
if (break_at == -1)
break_at = i - 1;
if (break_at == -1)
break_at = 0;
ass_msg(render_priv->library, MSGL_DBG2, "overfill at %d", i);
ass_msg(render_priv->library, MSGL_DBG2, "line break at %d",
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 >= text_info->max_lines) {
// Raise maximum number of lines
text_info->max_lines *= 2;
text_info->lines = realloc(text_info->lines,
sizeof(LineInfo) *
text_info->max_lines);
}
if (lead < text_info->length)
text_info->glyphs[lead].linebreak = break_type;
last_space = -1;
s1 = text_info->glyphs + lead;
s_offset = d6_to_double(s1->bbox.xMin + s1->pos.x);
text_info->n_lines++;
}
if (cur->symbol == ' ')
last_space = i;
// make sure the hard linebreak is not forgotten when
// there was a new soft linebreak just inserted
if (cur->symbol == '\n' && break_type == 1)
i--;
}
#define DIFF(x,y) (((x) < (y)) ? (y - x) : (x - y))
exit = 0;
while (!exit && render_priv->state.wrap_style != 1) {
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;
if (s1 && (s2->linebreak == 1)) { // have at least 2 lines, and linebreak is 'soft'
double l1, l2, l1_new, l2_new;
w = s2;
do {
--w;
} while ((w > s1) && (w->symbol == ' '));
while ((w > s1) && (w->symbol != ' ')) {
--w;
}
e1 = w;
while ((e1 > s1) && (e1->symbol == ' ')) {
--e1;
}
if (w->symbol == ' ')
++w;
l1 = d6_to_double(((s2 - 1)->bbox.xMax + (s2 - 1)->pos.x) -
(s1->bbox.xMin + s1->pos.x));
l2 = d6_to_double(((s3 - 1)->bbox.xMax + (s3 - 1)->pos.x) -
(s2->bbox.xMin + s2->pos.x));
l1_new = d6_to_double(
(e1->bbox.xMax + e1->pos.x) -
(s1->bbox.xMin + s1->pos.x));
l2_new = d6_to_double(
((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
measure_text(render_priv);
trim_whitespace(render_priv);
pen_shift_x = 0.;
pen_shift_y = 0.;
cur_line = 1;
i = 0;
cur = text_info->glyphs + i;
while (i < text_info->length && cur->skip)
cur = text_info->glyphs + ++i;
pen_shift_x = d6_to_double(-cur->pos.x);
for (i = 0; i < text_info->length; ++i) {
cur = text_info->glyphs + i;
if (cur->linebreak) {
while (i < text_info->length && cur->skip && cur->symbol != '\n')
cur = text_info->glyphs + ++i;
double height =
text_info->lines[cur_line - 1].desc +
text_info->lines[cur_line].asc;
cur_line++;
pen_shift_x = d6_to_double(-cur->pos.x);
pen_shift_y += height + render_priv->settings.line_spacing;
ass_msg(render_priv->library, MSGL_DBG2,
"shifting from %d to %d by (%f, %f)", i,
text_info->length - 1, pen_shift_x, pen_shift_y);
}
cur->pos.x += double_to_d6(pen_shift_x);
cur->pos.y += double_to_d6(pen_shift_y);
}
}
/**
* \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(ASS_Renderer *render_priv)
{
GlyphInfo *cur, *cur2;
GlyphInfo *s1, *e1; // start and end of the current word
GlyphInfo *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 = render_priv->time - render_priv->state.event->Start;
timing = 0;
s1 = s2 = 0;
for (i = 0; i <= render_priv->text_info.length; ++i) {
cur = render_priv->text_info.glyphs + i;
if ((i == render_priv->text_info.length)
|| (cur->effect_type != EF_NONE)) {
s1 = s2;
s2 = cur;
if (s1) {
e1 = s2 - 1;
tm_start = timing + s1->effect_skip_timing;
tm_end = tm_start + s1->effect_timing;
timing = tm_end;
x_start = 1000000;
x_end = -1000000;
for (cur2 = s1; cur2 <= e1; ++cur2) {
x_start = FFMIN(x_start, d6_to_int(cur2->bbox.xMin + cur2->pos.x));
x_end = FFMAX(x_end, d6_to_int(cur2->bbox.xMax + cur2->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 {
ass_msg(render_priv->library, MSGL_ERR,
"Unknown effect type");
continue;
}
for (cur2 = s1; cur2 <= e1; ++cur2) {
cur2->effect_type = s1->effect_type;
cur2->effect_timing = x - d6_to_int(cur2->pos.x);
}
}
}
}
}
/**
* \brief Calculate base point for positioning and rotation
* \param bbox text bbox
* \param alignment alignment
* \param bx, by out: base point coordinates
*/
static void get_base_point(DBBox *bbox, int alignment, double *bx, double *by)
{
const int halign = alignment & 3;
const int valign = alignment & 12;
if (bx)
switch (halign) {
case HALIGN_LEFT:
*bx = bbox->xMin;
break;
case HALIGN_CENTER:
*bx = (bbox->xMax + bbox->xMin) / 2.0;
break;
case HALIGN_RIGHT:
*bx = bbox->xMax;
break;
}
if (by)
switch (valign) {
case VALIGN_TOP:
*by = bbox->yMin;
break;
case VALIGN_CENTER:
*by = (bbox->yMax + bbox->yMin) / 2.0;
break;
case VALIGN_SUB:
*by = bbox->yMax;
break;
}
}
/**
* \brief Apply transformation to outline points of a glyph
* Applies rotations given by frx, fry and frz and projects the points back
* onto the screen plane.
*/
static void
transform_3d_points(FT_Vector shift, FT_Glyph glyph, double frx, double fry,
double frz, double fax, double fay, double scale,
int yshift)
{
double sx = sin(frx);
double sy = sin(fry);
double sz = sin(frz);
double cx = cos(frx);
double cy = cos(fry);
double cz = cos(frz);
FT_Outline *outline = &((FT_OutlineGlyph) glyph)->outline;
FT_Vector *p = outline->points;
double x, y, z, xx, yy, zz;
int i, dist;
dist = 20000 * scale;
for (i = 0; i < outline->n_points; i++) {
x = (double) p[i].x + shift.x + (fax * (yshift - p[i].y));
y = (double) p[i].y + shift.y + (-fay * p[i].x);
z = 0.;
xx = x * cz + y * sz;
yy = -(x * sz - y * cz);
zz = z;
x = xx;
y = yy * cx + zz * sx;
z = yy * sx - zz * cx;
xx = x * cy + z * sy;
yy = y;
zz = x * sy - z * cy;
zz = FFMAX(zz, 1000 - dist);
x = (xx * dist) / (zz + dist);
y = (yy * dist) / (zz + dist);
p[i].x = x - shift.x + 0.5;
p[i].y = y - shift.y + 0.5;
}
}
/**
* \brief Apply 3d transformation to several objects
* \param shift FreeType vector
* \param glyph FreeType glyph
* \param glyph2 FreeType glyph
* \param frx x-axis rotation angle
* \param fry y-axis rotation angle
* \param frz z-axis rotation angle
* Rotates both glyphs by frx, fry and frz. Shift vector is added before rotation and subtracted after it.
*/
static void
transform_3d(FT_Vector shift, FT_Glyph *glyph, FT_Glyph *glyph2,
double frx, double fry, double frz, double fax, double fay,
double scale, int yshift)
{
frx = -frx;
frz = -frz;
if (frx != 0. || fry != 0. || frz != 0. || fax != 0. || fay != 0.) {
if (glyph && *glyph)
transform_3d_points(shift, *glyph, frx, fry, frz,
fax, fay, scale, yshift);
if (glyph2 && *glyph2)
transform_3d_points(shift, *glyph2, frx, fry, frz,
fax, fay, scale, yshift);
}
}
/**
* \brief Main ass rendering function, glues everything together
* \param event event to render
* \param event_images struct containing resulting images, will also be initialized
* Process event, appending resulting ASS_Image's to images_root.
*/
static int
ass_render_event(ASS_Renderer *render_priv, ASS_Event *event,
EventImages *event_images)
{
char *p;
FT_UInt previous;
FT_UInt num_glyphs;
FT_Vector pen;
unsigned code;
DBBox bbox;
int i, j;
int MarginL, MarginR, MarginV;
int last_break;
int alignment, halign, valign;
double device_x = 0;
double device_y = 0;
TextInfo *text_info = &render_priv->text_info;
ASS_Drawing *drawing;
if (event->Style >= render_priv->track->n_styles) {
ass_msg(render_priv->library, MSGL_WARN, "No style found");
return 1;
}
if (!event->Text) {
ass_msg(render_priv->library, MSGL_WARN, "Empty event");
return 1;
}
init_render_context(render_priv, event);
drawing = render_priv->state.drawing;
text_info->length = 0;
pen.x = 0;
pen.y = 0;
previous = 0;
num_glyphs = 0;
p = event->Text;
// Event parsing.
while (1) {
// get next char, executing style override
// this affects render_context
do {
code = get_next_char(render_priv, &p);
if (render_priv->state.drawing_mode && code)
ass_drawing_add_char(drawing, (char) code);
} while (code && render_priv->state.drawing_mode); // skip everything in drawing mode
// Parse drawing
if (drawing->i) {
drawing->scale_x = render_priv->state.scale_x *
render_priv->font_scale_x *
render_priv->font_scale;
drawing->scale_y = render_priv->state.scale_y *
render_priv->font_scale;
ass_drawing_hash(drawing);
p--;
code = -1;
}
// face could have been changed in get_next_char
if (!render_priv->state.font) {
free_render_context(render_priv);
return 1;
}
if (code == 0)
break;
if (text_info->length >= text_info->max_glyphs) {
// Raise maximum number of glyphs
text_info->max_glyphs *= 2;
text_info->glyphs =
realloc(text_info->glyphs,
sizeof(GlyphInfo) * text_info->max_glyphs);
}
// Add kerning to pen
if (previous && code && !drawing->hash) {
FT_Vector delta;
delta =
ass_font_get_kerning(render_priv->state.font, previous,
code);
pen.x += delta.x * render_priv->state.scale_x
* render_priv->font_scale_x;
pen.y += delta.y * render_priv->state.scale_y
* render_priv->font_scale_x;
}
ass_font_set_transform(render_priv->state.font,
render_priv->state.scale_x *
render_priv->font_scale_x,
render_priv->state.scale_y, NULL);
get_outline_glyph(render_priv, code,
text_info->glyphs + text_info->length, drawing);
// Add additional space after italic to non-italic style changes
if (text_info->length &&
text_info->glyphs[text_info->length - 1].hash_key.italic &&
!render_priv->state.italic) {
int back = text_info->length - 1;
GlyphInfo *og = &text_info->glyphs[back];
while (back && og->bbox.xMax - og->bbox.xMin == 0
&& og->hash_key.italic)
og = &text_info->glyphs[--back];
if (og->bbox.xMax > og->advance.x) {
// The FreeType oblique slants by 6/16
pen.x += og->bbox.yMax * 0.375;
}
}
text_info->glyphs[text_info->length].pos.x = pen.x;
text_info->glyphs[text_info->length].pos.y = pen.y;
pen.x += text_info->glyphs[text_info->length].advance.x;
pen.x += double_to_d6(render_priv->state.hspacing *
render_priv->font_scale
* render_priv->state.scale_x);
pen.y += text_info->glyphs[text_info->length].advance.y;
pen.y += (render_priv->state.fay * render_priv->state.scale_y) *
text_info->glyphs[text_info->length].advance.x;
previous = code;
text_info->glyphs[text_info->length].symbol = code;
text_info->glyphs[text_info->length].linebreak = 0;
for (i = 0; i < 4; ++i) {
uint32_t clr = render_priv->state.c[i];
change_alpha(&clr,
mult_alpha(_a(clr), render_priv->state.fade), 1.);
text_info->glyphs[text_info->length].c[i] = clr;
}
text_info->glyphs[text_info->length].effect_type =
render_priv->state.effect_type;
text_info->glyphs[text_info->length].effect_timing =
render_priv->state.effect_timing;
text_info->glyphs[text_info->length].effect_skip_timing =
render_priv->state.effect_skip_timing;
text_info->glyphs[text_info->length].be = render_priv->state.be;
text_info->glyphs[text_info->length].blur = render_priv->state.blur;
text_info->glyphs[text_info->length].shadow_x =
render_priv->state.shadow_x;
text_info->glyphs[text_info->length].shadow_y =
render_priv->state.shadow_y;
text_info->glyphs[text_info->length].frx = render_priv->state.frx;
text_info->glyphs[text_info->length].fry = render_priv->state.fry;
text_info->glyphs[text_info->length].frz = render_priv->state.frz;
text_info->glyphs[text_info->length].fax = render_priv->state.fax;
text_info->glyphs[text_info->length].fay = render_priv->state.fay;
if (drawing->hash) {
text_info->glyphs[text_info->length].asc = drawing->asc;
text_info->glyphs[text_info->length].desc = drawing->desc;
} else {
ass_font_get_asc_desc(render_priv->state.font, code,
&text_info->glyphs[text_info->length].asc,
&text_info->glyphs[text_info->length].desc);
text_info->glyphs[text_info->length].asc *=
render_priv->state.scale_y;
text_info->glyphs[text_info->length].desc *=
render_priv->state.scale_y;
}
// fill bitmap_hash_key
if (!drawing->hash) {
text_info->glyphs[text_info->length].hash_key.font =
render_priv->state.font;
text_info->glyphs[text_info->length].hash_key.size =
render_priv->state.font_size;
text_info->glyphs[text_info->length].hash_key.bold =
render_priv->state.bold;
text_info->glyphs[text_info->length].hash_key.italic =
render_priv->state.italic;
} else
text_info->glyphs[text_info->length].hash_key.drawing_hash =
drawing->hash;
text_info->glyphs[text_info->length].hash_key.ch = code;
text_info->glyphs[text_info->length].hash_key.outline.x =
render_priv->state.border_x * 0xFFFF;
text_info->glyphs[text_info->length].hash_key.outline.y =
render_priv->state.border_y * 0xFFFF;
text_info->glyphs[text_info->length].hash_key.scale_x =
render_priv->state.scale_x * 0xFFFF;
text_info->glyphs[text_info->length].hash_key.scale_y =
render_priv->state.scale_y * 0xFFFF;
text_info->glyphs[text_info->length].hash_key.frx =
render_priv->state.frx * 0xFFFF;
text_info->glyphs[text_info->length].hash_key.fry =
render_priv->state.fry * 0xFFFF;
text_info->glyphs[text_info->length].hash_key.frz =
render_priv->state.frz * 0xFFFF;
text_info->glyphs[text_info->length].hash_key.fax =
render_priv->state.fax * 0xFFFF;
text_info->glyphs[text_info->length].hash_key.fay =
render_priv->state.fay * 0xFFFF;
text_info->glyphs[text_info->length].hash_key.advance.x = pen.x;
text_info->glyphs[text_info->length].hash_key.advance.y = pen.y;
text_info->glyphs[text_info->length].hash_key.be =
render_priv->state.be;
text_info->glyphs[text_info->length].hash_key.blur =
render_priv->state.blur;
text_info->glyphs[text_info->length].hash_key.border_style =
render_priv->state.style->BorderStyle;
text_info->glyphs[text_info->length].hash_key.shadow_offset.x =
double_to_d6(
render_priv->state.shadow_x * render_priv->border_scale -
(int) (render_priv->state.shadow_x *
render_priv->border_scale));
text_info->glyphs[text_info->length].hash_key.shadow_offset.y =
double_to_d6(
render_priv->state.shadow_y * render_priv->border_scale -
(int) (render_priv->state.shadow_y *
render_priv->border_scale));
text_info->glyphs[text_info->length].hash_key.flags =
render_priv->state.flags;
text_info->length++;
render_priv->state.effect_type = EF_NONE;
render_priv->state.effect_timing = 0;
render_priv->state.effect_skip_timing = 0;
if (drawing->hash) {
ass_drawing_free(drawing);
drawing = render_priv->state.drawing =
ass_drawing_new(render_priv->fontconfig_priv,
render_priv->state.font,
render_priv->settings.hinting,
render_priv->ftlibrary);
}
}
if (text_info->length == 0) {
// no valid symbols in the event; this can be smth like {comment}
free_render_context(render_priv);
return 1;
}
// depends on glyph x coordinates being monotonous, so it should be done before line wrap
process_karaoke_effects(render_priv);
// alignments
alignment = render_priv->state.alignment;
halign = alignment & 3;
valign = alignment & 12;
MarginL =
(event->MarginL) ? event->MarginL : render_priv->state.style->
MarginL;
MarginR =
(event->MarginR) ? event->MarginR : render_priv->state.style->
MarginR;
MarginV =
(event->MarginV) ? event->MarginV : render_priv->state.style->
MarginV;
if (render_priv->state.evt_type != EVENT_HSCROLL) {
double max_text_width;
// calculate max length of a line
max_text_width =
x2scr(render_priv,
render_priv->track->PlayResX - MarginR) -
x2scr(render_priv, MarginL);
// rearrange text in several lines
wrap_lines_smart(render_priv, max_text_width);
// 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) {
double width, shift = 0;
GlyphInfo *first_glyph =
text_info->glyphs + last_break + 1;
GlyphInfo *last_glyph = text_info->glyphs + i - 1;
while (first_glyph < last_glyph && first_glyph->skip)
first_glyph++;
while ((last_glyph > first_glyph)
&& ((last_glyph->symbol == '\n')
|| (last_glyph->symbol == 0)
|| (last_glyph->skip)))
last_glyph--;
width = d6_to_double(
last_glyph->pos.x + last_glyph->advance.x -
first_glyph->pos.x);
if (halign == HALIGN_LEFT) { // left aligned, no action
shift = 0;
} else if (halign == HALIGN_RIGHT) { // right aligned
shift = max_text_width - width;
} else if (halign == HALIGN_CENTER) { // centered
shift = (max_text_width - width) / 2.0;
}
for (j = last_break + 1; j < i; ++j) {
text_info->glyphs[j].pos.x += double_to_d6(shift);
}
last_break = i - 1;
}
}
} else { // render_priv->state.evt_type == EVENT_HSCROLL
measure_text(render_priv);
}
// determing text bounding box
compute_string_bbox(text_info, &bbox);
// determine device coordinates for text
// x coordinate for everything except positioned events
if (render_priv->state.evt_type == EVENT_NORMAL ||
render_priv->state.evt_type == EVENT_VSCROLL) {
device_x = x2scr(render_priv, MarginL);
} else if (render_priv->state.evt_type == EVENT_HSCROLL) {
if (render_priv->state.scroll_direction == SCROLL_RL)
device_x =
x2scr(render_priv,
render_priv->track->PlayResX -
render_priv->state.scroll_shift);
else if (render_priv->state.scroll_direction == SCROLL_LR)
device_x =
x2scr(render_priv,
render_priv->state.scroll_shift) - (bbox.xMax -
bbox.xMin);
}
// y coordinate for everything except positioned events
if (render_priv->state.evt_type == EVENT_NORMAL ||
render_priv->state.evt_type == EVENT_HSCROLL) {
if (valign == VALIGN_TOP) { // toptitle
device_y =
y2scr_top(render_priv,
MarginV) + text_info->lines[0].asc;
} else if (valign == VALIGN_CENTER) { // midtitle
double scr_y =
y2scr(render_priv, render_priv->track->PlayResY / 2.0);
device_y = scr_y - (bbox.yMax + bbox.yMin) / 2.0;
} else { // subtitle
double scr_y;
if (valign != VALIGN_SUB)
ass_msg(render_priv->library, MSGL_V,
"Invalid valign, supposing 0 (subtitle)");
scr_y =
y2scr_sub(render_priv,
render_priv->track->PlayResY - MarginV);
device_y = scr_y;
device_y -= text_info->height;
device_y += text_info->lines[0].asc;
}
} else if (render_priv->state.evt_type == EVENT_VSCROLL) {
if (render_priv->state.scroll_direction == SCROLL_TB)
device_y =
y2scr(render_priv,
render_priv->state.clip_y0 +
render_priv->state.scroll_shift) - (bbox.yMax -
bbox.yMin);
else if (render_priv->state.scroll_direction == SCROLL_BT)
device_y =
y2scr(render_priv,
render_priv->state.clip_y1 -
render_priv->state.scroll_shift);
}
// positioned events are totally different
if (render_priv->state.evt_type == EVENT_POSITIONED) {
double base_x = 0;
double base_y = 0;
ass_msg(render_priv->library, MSGL_DBG2, "positioned event at %f, %f",
render_priv->state.pos_x, render_priv->state.pos_y);
get_base_point(&bbox, alignment, &base_x, &base_y);
device_x =
x2scr_pos(render_priv, render_priv->state.pos_x) - base_x;
device_y =
y2scr_pos(render_priv, render_priv->state.pos_y) - base_y;
}
// fix clip coordinates (they depend on alignment)
if (render_priv->state.evt_type == EVENT_NORMAL ||
render_priv->state.evt_type == EVENT_HSCROLL ||
render_priv->state.evt_type == EVENT_VSCROLL) {
render_priv->state.clip_x0 =
x2scr(render_priv, render_priv->state.clip_x0);
render_priv->state.clip_x1 =
x2scr(render_priv, render_priv->state.clip_x1);
if (valign == VALIGN_TOP) {
render_priv->state.clip_y0 =
y2scr_top(render_priv, render_priv->state.clip_y0);
render_priv->state.clip_y1 =
y2scr_top(render_priv, render_priv->state.clip_y1);
} else if (valign == VALIGN_CENTER) {
render_priv->state.clip_y0 =
y2scr(render_priv, render_priv->state.clip_y0);
render_priv->state.clip_y1 =
y2scr(render_priv, render_priv->state.clip_y1);
} else if (valign == VALIGN_SUB) {
render_priv->state.clip_y0 =
y2scr_sub(render_priv, render_priv->state.clip_y0);
render_priv->state.clip_y1 =
y2scr_sub(render_priv, render_priv->state.clip_y1);
}
} else if (render_priv->state.evt_type == EVENT_POSITIONED) {
render_priv->state.clip_x0 =
x2scr_pos(render_priv, render_priv->state.clip_x0);
render_priv->state.clip_x1 =
x2scr_pos(render_priv, render_priv->state.clip_x1);
render_priv->state.clip_y0 =
y2scr_pos(render_priv, render_priv->state.clip_y0);
render_priv->state.clip_y1 =
y2scr_pos(render_priv, render_priv->state.clip_y1);
}
// calculate rotation parameters
{
DVector center;
if (render_priv->state.have_origin) {
center.x = x2scr(render_priv, render_priv->state.org_x);
center.y = y2scr(render_priv, render_priv->state.org_y);
} else {
double bx = 0., by = 0.;
get_base_point(&bbox, alignment, &bx, &by);
center.x = device_x + bx;
center.y = device_y + by;
}
for (i = 0; i < text_info->length; ++i) {
GlyphInfo *info = text_info->glyphs + i;
if (info->hash_key.frx || info->hash_key.fry
|| info->hash_key.frz || info->hash_key.fax
|| info->hash_key.fay) {
info->hash_key.shift_x = info->pos.x + double_to_d6(device_x - center.x);
info->hash_key.shift_y =
-(info->pos.y + double_to_d6(device_y - center.y));
} else {
info->hash_key.shift_x = 0;
info->hash_key.shift_y = 0;
}
}
}
// convert glyphs to bitmaps
for (i = 0; i < text_info->length; ++i) {
GlyphInfo *g = text_info->glyphs + i;
g->hash_key.advance.x =
double_to_d6(device_x - (int) device_x +
d6_to_double(g->pos.x & SUBPIXEL_MASK)) & ~SUBPIXEL_ACCURACY;
g->hash_key.advance.y =
double_to_d6(device_y - (int) device_y +
d6_to_double(g->pos.y & SUBPIXEL_MASK)) & ~SUBPIXEL_ACCURACY;
get_bitmap_glyph(render_priv, text_info->glyphs + i);
}
memset(event_images, 0, sizeof(*event_images));
event_images->top = device_y - text_info->lines[0].asc;
event_images->height = text_info->height;
event_images->left = device_x + bbox.xMin + 0.5;
event_images->width = bbox.xMax - bbox.xMin + 0.5;
event_images->detect_collisions = render_priv->state.detect_collisions;
event_images->shift_direction = (valign == VALIGN_TOP) ? 1 : -1;
event_images->event = event;
event_images->imgs = render_text(render_priv, (int) device_x, (int) device_y);
free_render_context(render_priv);
return 0;
}
/**
* \brief deallocate image list
* \param img list pointer
*/
static void ass_free_images(ASS_Image *img)
{
while (img) {
ASS_Image *next = img->next;
free(img);
img = next;
}
}
static void ass_reconfigure(ASS_Renderer *priv)
{
priv->render_id++;
priv->cache.glyph_cache =
ass_glyph_cache_reset(priv->cache.glyph_cache);
priv->cache.bitmap_cache =
ass_bitmap_cache_reset(priv->cache.bitmap_cache);
priv->cache.composite_cache =
ass_composite_cache_reset(priv->cache.composite_cache);
ass_free_images(priv->prev_images_root);
priv->prev_images_root = 0;
}
void ass_set_frame_size(ASS_Renderer *priv, int w, int h)
{
if (priv->settings.frame_width != w || priv->settings.frame_height != h) {
priv->settings.frame_width = w;
priv->settings.frame_height = h;
if (priv->settings.aspect == 0.) {
priv->settings.aspect = ((double) w) / h;
priv->settings.storage_aspect = ((double) w) / h;
}
ass_reconfigure(priv);
}
}
void ass_set_margins(ASS_Renderer *priv, int t, int b, int l, int r)
{
if (priv->settings.left_margin != l ||
priv->settings.right_margin != r ||
priv->settings.top_margin != t
|| priv->settings.bottom_margin != b) {
priv->settings.left_margin = l;
priv->settings.right_margin = r;
priv->settings.top_margin = t;
priv->settings.bottom_margin = b;
ass_reconfigure(priv);
}
}
void ass_set_use_margins(ASS_Renderer *priv, int use)
{
priv->settings.use_margins = use;
}
void ass_set_aspect_ratio(ASS_Renderer *priv, double dar, double sar)
{
if (priv->settings.aspect != dar || priv->settings.storage_aspect != sar) {
priv->settings.aspect = dar;
priv->settings.storage_aspect = sar;
ass_reconfigure(priv);
}
}
void ass_set_font_scale(ASS_Renderer *priv, double font_scale)
{
if (priv->settings.font_size_coeff != font_scale) {
priv->settings.font_size_coeff = font_scale;
ass_reconfigure(priv);
}
}
void ass_set_hinting(ASS_Renderer *priv, ASS_Hinting ht)
{
if (priv->settings.hinting != ht) {
priv->settings.hinting = ht;
ass_reconfigure(priv);
}
}
void ass_set_line_spacing(ASS_Renderer *priv, double line_spacing)
{
priv->settings.line_spacing = line_spacing;
}
void ass_set_fonts(ASS_Renderer *priv, const char *default_font,
const char *default_family, int fc, const char *config,
int update)
{
free(priv->settings.default_font);
free(priv->settings.default_family);
priv->settings.default_font = default_font ? strdup(default_font) : 0;
priv->settings.default_family =
default_family ? strdup(default_family) : 0;
if (priv->fontconfig_priv)
fontconfig_done(priv->fontconfig_priv);
priv->fontconfig_priv =
fontconfig_init(priv->library, priv->ftlibrary, default_family,
default_font, fc, config, update);
}
int ass_fonts_update(ASS_Renderer *render_priv)
{
return fontconfig_update(render_priv->fontconfig_priv);
}
/**
* \brief Start a new frame
*/
static int
ass_start_frame(ASS_Renderer *render_priv, ASS_Track *track,
long long now)
{
ASS_Settings *settings_priv = &render_priv->settings;
CacheStore *cache = &render_priv->cache;
if (!render_priv->settings.frame_width
&& !render_priv->settings.frame_height)
return 1; // library not initialized
if (render_priv->library != track->library)
return 1;
free_list_clear(render_priv);
if (track->n_events == 0)
return 1; // nothing to do
render_priv->width = settings_priv->frame_width;
render_priv->height = settings_priv->frame_height;
render_priv->orig_width =
settings_priv->frame_width - settings_priv->left_margin -
settings_priv->right_margin;
render_priv->orig_height =
settings_priv->frame_height - settings_priv->top_margin -
settings_priv->bottom_margin;
render_priv->orig_width_nocrop =
settings_priv->frame_width - FFMAX(settings_priv->left_margin,
0) -
FFMAX(settings_priv->right_margin, 0);
render_priv->orig_height_nocrop =
settings_priv->frame_height - FFMAX(settings_priv->top_margin,
0) -
FFMAX(settings_priv->bottom_margin, 0);
render_priv->track = track;
render_priv->time = now;
ass_lazy_track_init(render_priv);
render_priv->font_scale = settings_priv->font_size_coeff *
render_priv->orig_height / render_priv->track->PlayResY;
if (render_priv->track->ScaledBorderAndShadow)
render_priv->border_scale =
((double) render_priv->orig_height) /
render_priv->track->PlayResY;
else
render_priv->border_scale = 1.;
// PAR correction
render_priv->font_scale_x = render_priv->settings.aspect /
render_priv->settings.storage_aspect;
render_priv->prev_images_root = render_priv->images_root;
render_priv->images_root = 0;
if (cache->bitmap_cache->cache_size > cache->bitmap_max_size) {
ass_msg(render_priv->library, MSGL_V,
"Hitting hard bitmap cache limit (was: %ld bytes), "
"resetting.", (long) cache->bitmap_cache->cache_size);
cache->bitmap_cache = ass_bitmap_cache_reset(cache->bitmap_cache);
cache->composite_cache = ass_composite_cache_reset(
cache->composite_cache);
ass_free_images(render_priv->prev_images_root);
render_priv->prev_images_root = 0;
}
if (cache->glyph_cache->count > cache->glyph_max) {
ass_msg(render_priv->library, MSGL_V,
"Hitting hard glyph cache limit (was: %ld glyphs), resetting.",
(long) cache->glyph_cache->count);
cache->glyph_cache = ass_glyph_cache_reset(cache->glyph_cache);
}
return 0;
}
static int cmp_event_layer(const void *p1, const void *p2)
{
ASS_Event *e1 = ((EventImages *) p1)->event;
ASS_Event *e2 = ((EventImages *) p2)->event;
if (e1->Layer < e2->Layer)
return -1;
if (e1->Layer > e2->Layer)
return 1;
if (e1->ReadOrder < e2->ReadOrder)
return -1;
if (e1->ReadOrder > e2->ReadOrder)
return 1;
return 0;
}
static ASS_RenderPriv *get_render_priv(ASS_Renderer *render_priv,
ASS_Event *event)
{
if (!event->render_priv)
event->render_priv = calloc(1, sizeof(ASS_RenderPriv));
if (render_priv->render_id != event->render_priv->render_id) {
memset(event->render_priv, 0, sizeof(ASS_RenderPriv));
event->render_priv->render_id = render_priv->render_id;
}
return event->render_priv;
}
static int overlap(Segment *s1, Segment *s2)
{
if (s1->a >= s2->b || s2->a >= s1->b ||
s1->ha >= s2->hb || s2->ha >= s1->hb)
return 0;
return 1;
}
static int cmp_segment(const void *p1, const void *p2)
{
return ((Segment *) p1)->a - ((Segment *) p2)->a;
}
static void
shift_event(ASS_Renderer *render_priv, EventImages *ei, int shift)
{
ASS_Image *cur = ei->imgs;
while (cur) {
cur->dst_y += shift;
// clip top and bottom
if (cur->dst_y < 0) {
int clip = -cur->dst_y;
cur->h -= clip;
cur->bitmap += clip * cur->stride;
cur->dst_y = 0;
}
if (cur->dst_y + cur->h >= render_priv->height) {
int clip = cur->dst_y + cur->h - render_priv->height;
cur->h -= clip;
}
if (cur->h <= 0) {
cur->h = 0;
cur->dst_y = 0;
}
cur = cur->next;
}
ei->top += shift;
}
// dir: 1 - move down
// -1 - move up
static int fit_segment(Segment *s, Segment *fixed, int *cnt, int dir)
{
int i;
int shift = 0;
if (dir == 1) // move down
for (i = 0; i < *cnt; ++i) {
if (s->b + shift <= fixed[i].a || s->a + shift >= fixed[i].b ||
s->hb <= fixed[i].ha || s->ha >= fixed[i].hb)
continue;
shift = fixed[i].b - s->a;
} else // dir == -1, move up
for (i = *cnt - 1; i >= 0; --i) {
if (s->b + shift <= fixed[i].a || s->a + shift >= fixed[i].b ||
s->hb <= fixed[i].ha || s->ha >= fixed[i].hb)
continue;
shift = fixed[i].a - s->b;
}
fixed[*cnt].a = s->a + shift;
fixed[*cnt].b = s->b + shift;
fixed[*cnt].ha = s->ha;
fixed[*cnt].hb = s->hb;
(*cnt)++;
qsort(fixed, *cnt, sizeof(Segment), cmp_segment);
return shift;
}
static void
fix_collisions(ASS_Renderer *render_priv, EventImages *imgs, int cnt)
{
Segment *used = malloc(cnt * sizeof(*used));
int cnt_used = 0;
int i, j;
// fill used[] with fixed events
for (i = 0; i < cnt; ++i) {
ASS_RenderPriv *priv;
if (!imgs[i].detect_collisions)
continue;
priv = get_render_priv(render_priv, imgs[i].event);
if (priv->height > 0) { // it's a fixed event
Segment s;
s.a = priv->top;
s.b = priv->top + priv->height;
s.ha = priv->left;
s.hb = priv->left + priv->width;
if (priv->height != imgs[i].height) { // no, it's not
ass_msg(render_priv->library, MSGL_WARN,
"Warning! Event height has changed");
priv->top = 0;
priv->height = 0;
priv->left = 0;
priv->width = 0;
}
for (j = 0; j < cnt_used; ++j)
if (overlap(&s, used + j)) { // no, it's not
priv->top = 0;
priv->height = 0;
priv->left = 0;
priv->width = 0;
}
if (priv->height > 0) { // still a fixed event
used[cnt_used].a = priv->top;
used[cnt_used].b = priv->top + priv->height;
used[cnt_used].ha = priv->left;
used[cnt_used].hb = priv->left + priv->width;
cnt_used++;
shift_event(render_priv, imgs + i, priv->top - imgs[i].top);
}
}
}
qsort(used, cnt_used, sizeof(Segment), cmp_segment);
// try to fit other events in free spaces
for (i = 0; i < cnt; ++i) {
ASS_RenderPriv *priv;
if (!imgs[i].detect_collisions)
continue;
priv = get_render_priv(render_priv, imgs[i].event);
if (priv->height == 0) { // not a fixed event
int shift;
Segment s;
s.a = imgs[i].top;
s.b = imgs[i].top + imgs[i].height;
s.ha = imgs[i].left;
s.hb = imgs[i].left + imgs[i].width;
shift = fit_segment(&s, used, &cnt_used, imgs[i].shift_direction);
if (shift)
shift_event(render_priv, imgs + i, shift);
// make it fixed
priv->top = imgs[i].top;
priv->height = imgs[i].height;
priv->left = imgs[i].left;
priv->width = imgs[i].width;
}
}
free(used);
}
/**
* \brief compare two images
* \param i1 first image
* \param i2 second image
* \return 0 if identical, 1 if different positions, 2 if different content
*/
static int ass_image_compare(ASS_Image *i1, ASS_Image *i2)
{
if (i1->w != i2->w)
return 2;
if (i1->h != i2->h)
return 2;
if (i1->stride != i2->stride)
return 2;
if (i1->color != i2->color)
return 2;
if (i1->bitmap != i2->bitmap)
return 2;
if (i1->dst_x != i2->dst_x)
return 1;
if (i1->dst_y != i2->dst_y)
return 1;
return 0;
}
/**
* \brief compare current and previous image list
* \param priv library handle
* \return 0 if identical, 1 if different positions, 2 if different content
*/
static int ass_detect_change(ASS_Renderer *priv)
{
ASS_Image *img, *img2;
int diff;
img = priv->prev_images_root;
img2 = priv->images_root;
diff = 0;
while (img && diff < 2) {
ASS_Image *next, *next2;
next = img->next;
if (img2) {
int d = ass_image_compare(img, img2);
if (d > diff)
diff = d;
next2 = img2->next;
} else {
// previous list is shorter
diff = 2;
break;
}
img = next;
img2 = next2;
}
// is the previous list longer?
if (img2)
diff = 2;
return diff;
}
/**
* \brief render a frame
* \param priv library handle
* \param track track
* \param now current video timestamp (ms)
* \param detect_change a value describing how the new images differ from the previous ones will be written here:
* 0 if identical, 1 if different positions, 2 if different content.
* Can be NULL, in that case no detection is performed.
*/
ASS_Image *ass_render_frame(ASS_Renderer *priv, ASS_Track *track,
long long now, int *detect_change)
{
int i, cnt, rc;
EventImages *last;
ASS_Image **tail;
// init frame
rc = ass_start_frame(priv, track, now);
if (rc != 0)
return 0;
// render events separately
cnt = 0;
for (i = 0; i < track->n_events; ++i) {
ASS_Event *event = track->events + i;
if ((event->Start <= now)
&& (now < (event->Start + event->Duration))) {
if (cnt >= priv->eimg_size) {
priv->eimg_size += 100;
priv->eimg =
realloc(priv->eimg,
priv->eimg_size * sizeof(EventImages));
}
rc = ass_render_event(priv, event, priv->eimg + cnt);
if (!rc)
++cnt;
}
}
// sort by layer
qsort(priv->eimg, cnt, sizeof(EventImages), cmp_event_layer);
// call fix_collisions for each group of events with the same layer
last = priv->eimg;
for (i = 1; i < cnt; ++i)
if (last->event->Layer != priv->eimg[i].event->Layer) {
fix_collisions(priv, last, priv->eimg + i - last);
last = priv->eimg + i;
}
if (cnt > 0)
fix_collisions(priv, last, priv->eimg + cnt - last);
// concat lists
tail = &priv->images_root;
for (i = 0; i < cnt; ++i) {
ASS_Image *cur = priv->eimg[i].imgs;
while (cur) {
*tail = cur;
tail = &cur->next;
cur = cur->next;
}
}
if (detect_change)
*detect_change = ass_detect_change(priv);
// free the previous image list
ass_free_images(priv->prev_images_root);
priv->prev_images_root = 0;
return priv->images_root;
}
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