487 lines
14 KiB
C
487 lines
14 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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* libass is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* libass is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with libass; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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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 "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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/**
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* Select Microfost Unicode CharMap, if the font has one.
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* Otherwise, let FreeType decide.
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*/
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static void charmap_magic(ass_library_t *library, FT_Face face)
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{
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int i;
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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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}
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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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static void update_transform(ass_font_t *font)
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{
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int i;
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FT_Matrix m;
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m.xx = double_to_d16(font->scale_x);
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m.yy = double_to_d16(font->scale_y);
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m.xy = m.yx = 0;
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for (i = 0; i < font->n_faces; ++i)
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FT_Set_Transform(font->faces[i], &m, &font->v);
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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_t *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_t
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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_t *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, 0,
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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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update_transform(font);
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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_t according to "desc" argument
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*/
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ass_font_t *ass_font_new(void *font_cache, ass_library_t *library,
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FT_Library ftlibrary, void *fc_priv,
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ass_font_desc_t *desc)
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{
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int error;
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ass_font_t *fontp;
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ass_font_t font;
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fontp = ass_font_cache_find((hashmap_t *) 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.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_t *) 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_t *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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font->v.x = v->x;
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font->v.y = v->y;
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update_transform(font);
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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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#if (FREETYPE_MAJOR > 2) || ((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR > 1))
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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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#else
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FT_Set_Char_Size(face, 0, double_to_d6(size), 0, 0);
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#endif
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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_t *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_t *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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if (FT_Get_Char_Index(face, ch)) {
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int y_scale = face->size->metrics.y_scale;
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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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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_t *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;
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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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// Add points to the outline
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if (under) {
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int pos, size;
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pos = FT_MulFix(ps->underlinePosition, y_scale * font->scale_y);
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size = FT_MulFix(ps->underlineThickness,
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y_scale * font->scale_y / 2);
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if (pos > 0 || size <= 0)
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return 0;
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FT_Vector points[4] = {
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{.x = bear, .y = pos + size},
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{.x = advance, .y = pos + size},
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{.x = advance, .y = pos - size},
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{.x = bear, .y = pos - size},
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};
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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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ol->contours[ol->n_contours++] = ol->n_points - 1;
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}
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if (through) {
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int pos, size;
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pos = FT_MulFix(os2->yStrikeoutPosition, y_scale * font->scale_y);
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size = FT_MulFix(os2->yStrikeoutSize, y_scale * font->scale_y / 2);
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if (pos < 0 || size <= 0)
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return 0;
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FT_Vector points[4] = {
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{.x = bear, .y = pos + size},
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{.x = advance, .y = pos + size},
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{.x = advance, .y = pos - size},
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{.x = bear, .y = pos - size},
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};
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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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ol->contours[ol->n_contours++] = ol->n_points - 1;
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}
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return 1;
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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_t *font,
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uint32_t ch, ass_hinting_t 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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if (ch < 0x20)
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return 0;
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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) {
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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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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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flags = 0;
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break;
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}
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error = FT_Load_Glyph(face, index, FT_LOAD_NO_BITMAP | 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 (FREETYPE_MAJOR > 2) || \
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((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR >= 2)) || \
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((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR == 1) && (FREETYPE_PATCH >= 10))
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// FreeType >= 2.1.10 required
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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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#endif
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error = FT_Get_Glyph(face->glyph, &glyph);
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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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ass_strike_outline_glyph(face, font, glyph, deco & DECO_UNDERLINE,
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deco & DECO_STRIKETHROUGH);
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return glyph;
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}
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/**
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* \brief Get kerning for the pair of glyphs.
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**/
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FT_Vector ass_font_get_kerning(ass_font_t *font, uint32_t c1, uint32_t c2)
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{
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FT_Vector v = { 0, 0 };
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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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int i1 = FT_Get_Char_Index(face, c1);
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int i2 = FT_Get_Char_Index(face, c2);
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if (i1 && i2) {
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if (FT_HAS_KERNING(face))
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FT_Get_Kerning(face, i1, i2, FT_KERNING_DEFAULT, &v);
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return v;
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}
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if (i1 || i2) // these glyphs are from different font faces, no kerning information
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return v;
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}
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return v;
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}
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/**
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* \brief Deallocate ass_font_t
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**/
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void ass_font_free(ass_font_t *font)
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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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if (font->faces[i])
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FT_Done_Face(font->faces[i]);
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if (font->desc.family)
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free(font->desc.family);
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free(font);
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}
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