701 lines
21 KiB
C
701 lines
21 KiB
C
/*
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* Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
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*
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* This file is part of libass.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "config.h"
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#include <inttypes.h>
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_SYNTHESIS_H
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#include FT_GLYPH_H
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#include FT_TRUETYPE_TABLES_H
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#include FT_OUTLINE_H
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#include <strings.h>
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#include "ass.h"
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#include "ass_library.h"
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#include "ass_font.h"
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#include "ass_bitmap.h"
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#include "ass_cache.h"
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#include "ass_fontconfig.h"
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#include "ass_utils.h"
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#define VERTICAL_LOWER_BOUND 0x02f1
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/**
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* Select a good charmap, prefer Microsoft Unicode charmaps.
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* Otherwise, let FreeType decide.
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*/
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static void charmap_magic(ASS_Library *library, FT_Face face)
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{
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int i;
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int ms_cmap = -1;
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// Search for a Microsoft Unicode cmap
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for (i = 0; i < face->num_charmaps; ++i) {
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FT_CharMap cmap = face->charmaps[i];
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unsigned pid = cmap->platform_id;
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unsigned eid = cmap->encoding_id;
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if (pid == 3 /*microsoft */
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&& (eid == 1 /*unicode bmp */
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|| eid == 10 /*full unicode */ )) {
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FT_Set_Charmap(face, cmap);
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return;
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} else if (pid == 3 && ms_cmap < 0)
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ms_cmap = i;
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}
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// Try the first Microsoft cmap if no Microsoft Unicode cmap was found
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if (ms_cmap >= 0) {
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FT_CharMap cmap = face->charmaps[ms_cmap];
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FT_Set_Charmap(face, cmap);
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return;
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}
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if (!face->charmap) {
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if (face->num_charmaps == 0) {
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ass_msg(library, MSGL_WARN, "Font face with no charmaps");
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return;
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}
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ass_msg(library, MSGL_WARN,
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"No charmap autodetected, trying the first one");
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FT_Set_Charmap(face, face->charmaps[0]);
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return;
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}
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}
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/**
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* \brief find a memory font by name
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*/
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static int find_font(ASS_Library *library, char *name)
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{
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int i;
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for (i = 0; i < library->num_fontdata; ++i)
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if (strcasecmp(name, library->fontdata[i].name) == 0)
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return i;
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return -1;
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}
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static void face_set_size(FT_Face face, double size);
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static void buggy_font_workaround(FT_Face face)
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{
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// Some fonts have zero Ascender/Descender fields in 'hhea' table.
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// In this case, get the information from 'os2' table or, as
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// a last resort, from face.bbox.
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if (face->ascender + face->descender == 0 || face->height == 0) {
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TT_OS2 *os2 = FT_Get_Sfnt_Table(face, ft_sfnt_os2);
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if (os2) {
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face->ascender = os2->sTypoAscender;
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face->descender = os2->sTypoDescender;
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face->height = face->ascender - face->descender;
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} else {
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face->ascender = face->bbox.yMax;
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face->descender = face->bbox.yMin;
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face->height = face->ascender - face->descender;
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}
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}
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}
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/**
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* \brief Select a face with the given charcode and add it to ASS_Font
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* \return index of the new face in font->faces, -1 if failed
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*/
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static int add_face(void *fc_priv, ASS_Font *font, uint32_t ch)
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{
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char *path;
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int index;
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FT_Face face;
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int error;
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int mem_idx;
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if (font->n_faces == ASS_FONT_MAX_FACES)
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return -1;
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path =
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fontconfig_select(font->library, fc_priv, font->desc.family,
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font->desc.treat_family_as_pattern,
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font->desc.bold, font->desc.italic, &index, ch);
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if (!path)
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return -1;
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mem_idx = find_font(font->library, path);
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if (mem_idx >= 0) {
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error =
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FT_New_Memory_Face(font->ftlibrary,
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(unsigned char *) font->library->
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fontdata[mem_idx].data,
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font->library->fontdata[mem_idx].size, index,
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&face);
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if (error) {
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ass_msg(font->library, MSGL_WARN,
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"Error opening memory font: '%s'", path);
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free(path);
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return -1;
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}
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} else {
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error = FT_New_Face(font->ftlibrary, path, index, &face);
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if (error) {
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ass_msg(font->library, MSGL_WARN,
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"Error opening font: '%s', %d", path, index);
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free(path);
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return -1;
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}
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}
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charmap_magic(font->library, face);
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buggy_font_workaround(face);
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font->faces[font->n_faces++] = face;
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face_set_size(face, font->size);
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free(path);
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return font->n_faces - 1;
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}
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/**
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* \brief Create a new ASS_Font according to "desc" argument
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*/
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ASS_Font *ass_font_new(void *font_cache, ASS_Library *library,
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FT_Library ftlibrary, void *fc_priv,
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ASS_FontDesc *desc)
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{
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int error;
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ASS_Font *fontp;
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ASS_Font font;
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fontp = ass_font_cache_find((Hashmap *) font_cache, desc);
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if (fontp)
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return fontp;
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font.library = library;
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font.ftlibrary = ftlibrary;
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font.n_faces = 0;
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font.desc.family = strdup(desc->family);
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font.desc.treat_family_as_pattern = desc->treat_family_as_pattern;
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font.desc.bold = desc->bold;
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font.desc.italic = desc->italic;
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font.desc.vertical = desc->vertical;
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font.scale_x = font.scale_y = 1.;
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font.v.x = font.v.y = 0;
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font.size = 0.;
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error = add_face(fc_priv, &font, 0);
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if (error == -1) {
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free(font.desc.family);
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return 0;
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} else
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return ass_font_cache_add((Hashmap *) font_cache, &font);
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}
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/**
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* \brief Set font transformation matrix and shift vector
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**/
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void ass_font_set_transform(ASS_Font *font, double scale_x,
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double scale_y, FT_Vector *v)
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{
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font->scale_x = scale_x;
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font->scale_y = scale_y;
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if (v) {
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font->v.x = v->x;
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font->v.y = v->y;
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}
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}
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static void face_set_size(FT_Face face, double size)
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{
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TT_HoriHeader *hori = FT_Get_Sfnt_Table(face, ft_sfnt_hhea);
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TT_OS2 *os2 = FT_Get_Sfnt_Table(face, ft_sfnt_os2);
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double mscale = 1.;
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FT_Size_RequestRec rq;
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FT_Size_Metrics *m = &face->size->metrics;
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// VSFilter uses metrics from TrueType OS/2 table
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// The idea was borrowed from asa (http://asa.diac24.net)
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if (hori && os2) {
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int hori_height = hori->Ascender - hori->Descender;
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int os2_height = os2->usWinAscent + os2->usWinDescent;
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if (hori_height && os2_height)
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mscale = (double) hori_height / os2_height;
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}
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memset(&rq, 0, sizeof(rq));
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rq.type = FT_SIZE_REQUEST_TYPE_REAL_DIM;
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rq.width = 0;
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rq.height = double_to_d6(size * mscale);
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rq.horiResolution = rq.vertResolution = 0;
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FT_Request_Size(face, &rq);
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m->ascender /= mscale;
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m->descender /= mscale;
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m->height /= mscale;
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}
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/**
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* \brief Set font size
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**/
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void ass_font_set_size(ASS_Font *font, double size)
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{
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int i;
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if (font->size != size) {
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font->size = size;
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for (i = 0; i < font->n_faces; ++i)
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face_set_size(font->faces[i], size);
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}
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}
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/**
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* \brief Get maximal font ascender and descender.
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* \param ch character code
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* The values are extracted from the font face that provides glyphs for the given character
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**/
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void ass_font_get_asc_desc(ASS_Font *font, uint32_t ch, int *asc,
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int *desc)
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{
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int i;
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for (i = 0; i < font->n_faces; ++i) {
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FT_Face face = font->faces[i];
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TT_OS2 *os2 = FT_Get_Sfnt_Table(face, ft_sfnt_os2);
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if (FT_Get_Char_Index(face, ch)) {
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int y_scale = face->size->metrics.y_scale;
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if (os2) {
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*asc = FT_MulFix(os2->usWinAscent, y_scale);
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*desc = FT_MulFix(os2->usWinDescent, y_scale);
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} else {
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*asc = FT_MulFix(face->ascender, y_scale);
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*desc = FT_MulFix(-face->descender, y_scale);
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}
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if (font->desc.vertical && ch >= VERTICAL_LOWER_BOUND) {
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*asc = FT_MulFix(face->max_advance_width, y_scale);
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}
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return;
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}
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}
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*asc = *desc = 0;
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}
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/*
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* Strike a glyph with a horizontal line; it's possible to underline it
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* and/or strike through it. For the line's position and size, truetype
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* tables are consulted. Obviously this relies on the data in the tables
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* being accurate.
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*
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*/
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static int ass_strike_outline_glyph(FT_Face face, ASS_Font *font,
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FT_Glyph glyph, int under, int through)
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{
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TT_OS2 *os2 = FT_Get_Sfnt_Table(face, ft_sfnt_os2);
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TT_Postscript *ps = FT_Get_Sfnt_Table(face, ft_sfnt_post);
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FT_Outline *ol = &((FT_OutlineGlyph) glyph)->outline;
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int bear, advance, y_scale, i, dir;
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if (!under && !through)
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return 0;
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// Grow outline
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i = (under ? 4 : 0) + (through ? 4 : 0);
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ol->points = realloc(ol->points, sizeof(FT_Vector) *
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(ol->n_points + i));
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ol->tags = realloc(ol->tags, ol->n_points + i);
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i = !!under + !!through;
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ol->contours = realloc(ol->contours, sizeof(short) *
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(ol->n_contours + i));
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// If the bearing is negative, the glyph starts left of the current
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// pen position
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bear = FFMIN(face->glyph->metrics.horiBearingX, 0);
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// We're adding half a pixel to avoid small gaps
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advance = d16_to_d6(glyph->advance.x) + 32;
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y_scale = face->size->metrics.y_scale;
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// Reverse drawing direction for non-truetype fonts
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dir = FT_Outline_Get_Orientation(ol);
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// Add points to the outline
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if (under && ps) {
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int pos = FT_MulFix(ps->underlinePosition, y_scale * font->scale_y);
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int size = FT_MulFix(ps->underlineThickness,
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y_scale * font->scale_y / 2);
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FT_Vector points[4];
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if (pos > 0 || size <= 0)
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return 1;
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points[0].x = bear;
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points[0].y = pos + size;
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points[1].x = advance;
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points[1].y = pos + size;
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points[2].x = advance;
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points[2].y = pos - size;
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points[3].x = bear;
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points[3].y = pos - size;
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if (dir == FT_ORIENTATION_TRUETYPE) {
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for (i = 0; i < 4; i++) {
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ol->points[ol->n_points] = points[i];
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ol->tags[ol->n_points++] = 1;
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}
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} else {
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for (i = 3; i >= 0; i--) {
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ol->points[ol->n_points] = points[i];
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ol->tags[ol->n_points++] = 1;
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}
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}
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ol->contours[ol->n_contours++] = ol->n_points - 1;
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}
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if (through && os2) {
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int pos = FT_MulFix(os2->yStrikeoutPosition, y_scale * font->scale_y);
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int size = FT_MulFix(os2->yStrikeoutSize, y_scale * font->scale_y / 2);
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FT_Vector points[4];
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if (pos < 0 || size <= 0)
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return 1;
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points[0].x = bear;
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points[0].y = pos + size;
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points[1].x = advance;
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points[1].y = pos + size;
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points[2].x = advance;
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points[2].y = pos - size;
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points[3].x = bear;
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points[3].y = pos - size;
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if (dir == FT_ORIENTATION_TRUETYPE) {
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for (i = 0; i < 4; i++) {
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ol->points[ol->n_points] = points[i];
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ol->tags[ol->n_points++] = 1;
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}
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} else {
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for (i = 3; i >= 0; i--) {
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ol->points[ol->n_points] = points[i];
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ol->tags[ol->n_points++] = 1;
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}
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}
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ol->contours[ol->n_contours++] = ol->n_points - 1;
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}
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return 0;
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}
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/**
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* Slightly embold a glyph without touching its metrics
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*/
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static void ass_glyph_embolden(FT_GlyphSlot slot)
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{
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int str;
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if (slot->format != FT_GLYPH_FORMAT_OUTLINE)
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return;
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str = FT_MulFix(slot->face->units_per_EM,
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slot->face->size->metrics.y_scale) / 64;
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FT_Outline_Embolden(&slot->outline, str);
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}
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/**
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* \brief Get a glyph
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* \param ch character code
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**/
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FT_Glyph ass_font_get_glyph(void *fontconfig_priv, ASS_Font *font,
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uint32_t ch, ASS_Hinting hinting, int deco)
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{
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int error;
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int index = 0;
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int i;
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FT_Glyph glyph;
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FT_Face face = 0;
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int flags = 0;
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int vertical = font->desc.vertical;
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if (ch < 0x20)
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return 0;
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// Handle NBSP like a regular space when rendering the glyph
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if (ch == 0xa0)
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ch = ' ';
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if (font->n_faces == 0)
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return 0;
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for (i = 0; i < font->n_faces; ++i) {
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face = font->faces[i];
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index = FT_Get_Char_Index(face, ch);
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if (index)
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break;
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}
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#ifdef CONFIG_FONTCONFIG
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if (index == 0) {
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int face_idx;
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ass_msg(font->library, MSGL_INFO,
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"Glyph 0x%X not found, selecting one more "
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"font for (%s, %d, %d)", ch, font->desc.family,
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font->desc.bold, font->desc.italic);
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face_idx = add_face(fontconfig_priv, font, ch);
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if (face_idx >= 0) {
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face = font->faces[face_idx];
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index = FT_Get_Char_Index(face, ch);
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if (index == 0 && face->num_charmaps > 0) {
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FT_CharMap cur = face->charmap;
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ass_msg(font->library, MSGL_WARN,
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"Glyph 0x%X not found, falling back to first charmap", ch);
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FT_Set_Charmap(face, face->charmaps[0]);
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index = FT_Get_Char_Index(face, ch);
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FT_Set_Charmap(face, cur);
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}
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if (index == 0) {
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ass_msg(font->library, MSGL_ERR,
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"Glyph 0x%X not found in font for (%s, %d, %d)",
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ch, font->desc.family, font->desc.bold,
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font->desc.italic);
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}
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}
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}
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#endif
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flags = FT_LOAD_NO_BITMAP | FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH
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| FT_LOAD_IGNORE_TRANSFORM;
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switch (hinting) {
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case ASS_HINTING_NONE:
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flags |= FT_LOAD_NO_HINTING;
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break;
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case ASS_HINTING_LIGHT:
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flags |= FT_LOAD_FORCE_AUTOHINT | FT_LOAD_TARGET_LIGHT;
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break;
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case ASS_HINTING_NORMAL:
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flags |= FT_LOAD_FORCE_AUTOHINT;
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break;
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case ASS_HINTING_NATIVE:
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break;
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}
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error = FT_Load_Glyph(face, index, flags);
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if (error) {
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ass_msg(font->library, MSGL_WARN, "Error loading glyph, index %d",
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index);
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return 0;
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}
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if (!(face->style_flags & FT_STYLE_FLAG_ITALIC) &&
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(font->desc.italic > 55)) {
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FT_GlyphSlot_Oblique(face->glyph);
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}
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if (!(face->style_flags & FT_STYLE_FLAG_BOLD) &&
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(font->desc.bold > 80)) {
|
|
ass_glyph_embolden(face->glyph);
|
|
}
|
|
error = FT_Get_Glyph(face->glyph, &glyph);
|
|
if (error) {
|
|
ass_msg(font->library, MSGL_WARN, "Error loading glyph, index %d",
|
|
index);
|
|
return 0;
|
|
}
|
|
|
|
// Rotate glyph, if needed
|
|
if (vertical && ch >= VERTICAL_LOWER_BOUND) {
|
|
FT_Matrix m = { 0, double_to_d16(-1.0), double_to_d16(1.0), 0 };
|
|
FT_Outline_Transform(&((FT_OutlineGlyph) glyph)->outline, &m);
|
|
FT_Outline_Translate(&((FT_OutlineGlyph) glyph)->outline,
|
|
face->glyph->metrics.vertAdvance,
|
|
0);
|
|
glyph->advance.x = face->glyph->linearVertAdvance;
|
|
}
|
|
|
|
// Apply scaling and shift
|
|
{
|
|
FT_Matrix scale = { double_to_d16(font->scale_x), 0, 0,
|
|
double_to_d16(font->scale_y) };
|
|
FT_Outline *outl = &((FT_OutlineGlyph) glyph)->outline;
|
|
FT_Outline_Transform(outl, &scale);
|
|
FT_Outline_Translate(outl, font->v.x, font->v.y);
|
|
glyph->advance.x *= font->scale_x;
|
|
|
|
ass_strike_outline_glyph(face, font, glyph, deco & DECO_UNDERLINE,
|
|
deco & DECO_STRIKETHROUGH);
|
|
}
|
|
|
|
return glyph;
|
|
}
|
|
|
|
/**
|
|
* \brief Get kerning for the pair of glyphs.
|
|
**/
|
|
FT_Vector ass_font_get_kerning(ASS_Font *font, uint32_t c1, uint32_t c2)
|
|
{
|
|
FT_Vector v = { 0, 0 };
|
|
int i;
|
|
|
|
if (font->desc.vertical)
|
|
return v;
|
|
|
|
for (i = 0; i < font->n_faces; ++i) {
|
|
FT_Face face = font->faces[i];
|
|
int i1 = FT_Get_Char_Index(face, c1);
|
|
int i2 = FT_Get_Char_Index(face, c2);
|
|
if (i1 && i2) {
|
|
if (FT_HAS_KERNING(face))
|
|
FT_Get_Kerning(face, i1, i2, FT_KERNING_DEFAULT, &v);
|
|
return v;
|
|
}
|
|
if (i1 || i2) // these glyphs are from different font faces, no kerning information
|
|
return v;
|
|
}
|
|
return v;
|
|
}
|
|
|
|
/**
|
|
* \brief Deallocate ASS_Font
|
|
**/
|
|
void ass_font_free(ASS_Font *font)
|
|
{
|
|
int i;
|
|
for (i = 0; i < font->n_faces; ++i)
|
|
if (font->faces[i])
|
|
FT_Done_Face(font->faces[i]);
|
|
free(font->desc.family);
|
|
free(font);
|
|
}
|
|
|
|
/**
|
|
* \brief Calculate the cbox of a series of points
|
|
*/
|
|
static void
|
|
get_contour_cbox(FT_BBox *box, FT_Vector *points, int start, int end)
|
|
{
|
|
int i;
|
|
box->xMin = box->yMin = INT_MAX;
|
|
box->xMax = box->yMax = INT_MIN;
|
|
|
|
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 Determine winding direction of a contour
|
|
* \return direction; 0 = clockwise
|
|
*/
|
|
static int get_contour_direction(FT_Vector *points, int start, int end)
|
|
{
|
|
int i;
|
|
long long sum = 0;
|
|
int x = points[start].x;
|
|
int y = points[start].y;
|
|
for (i = start + 1; i <= end; i++) {
|
|
sum += x * (points[i].y - y) - y * (points[i].x - x);
|
|
x = points[i].x;
|
|
y = points[i].y;
|
|
}
|
|
sum += x * (points[start].y - y) - y * (points[start].x - x);
|
|
return sum > 0;
|
|
}
|
|
|
|
/**
|
|
* \brief Fix-up stroker result for huge borders by removing inside contours
|
|
* that would reverse in size
|
|
*/
|
|
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 = malloc(nc);
|
|
int start = 0;
|
|
int end = -1;
|
|
FT_BBox *boxes = malloc(nc * sizeof(FT_BBox));
|
|
int i, j;
|
|
int inside_direction;
|
|
|
|
inside_direction = FT_Outline_Get_Orientation(&glyph->outline) ==
|
|
FT_ORIENTATION_TRUETYPE;
|
|
|
|
// 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);
|
|
}
|
|
|
|
// for each contour, check direction and whether it's "outside"
|
|
// or contained in another contour
|
|
end = -1;
|
|
for (i = 0; i < nc; i++) {
|
|
int dir;
|
|
start = end + 1;
|
|
end = glyph->outline.contours[i];
|
|
dir = get_contour_direction(glyph->outline.points, start, end);
|
|
valid_cont[i] = 1;
|
|
if (dir == inside_direction) {
|
|
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)
|
|
goto check_inside;
|
|
}
|
|
/* "inside" contour but we can't find anything it could be
|
|
* inside of - assume the font is buggy and it should be
|
|
* an "outside" contour, and reverse it */
|
|
for (j = 0; j < (end + 1 - start) / 2; j++) {
|
|
FT_Vector temp = glyph->outline.points[start + j];
|
|
char temp2 = glyph->outline.tags[start + j];
|
|
glyph->outline.points[start + j] = glyph->outline.points[end - j];
|
|
glyph->outline.points[end - j] = temp;
|
|
glyph->outline.tags[start + j] = glyph->outline.tags[end - j];
|
|
glyph->outline.tags[end - j] = temp2;
|
|
}
|
|
dir ^= 1;
|
|
}
|
|
check_inside:
|
|
if (dir == inside_direction) {
|
|
FT_BBox box;
|
|
int width, height;
|
|
get_contour_cbox(&box, glyph->outline.points, start, end);
|
|
width = box.xMax - box.xMin;
|
|
height = box.yMax - box.yMin;
|
|
if (width < border_x * 2 || height < border_y * 2) {
|
|
valid_cont[i] = 0;
|
|
modified = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
// 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);
|
|
}
|
|
|