-// -*- c-basic-offset: 8; indent-tabs-mode: t -*-
-// vim:ts=8:sw=8:noet:ai:
/*
- Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
-
- This program 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.
-
- This program 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 this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-*/
+ * 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 FT_FREETYPE_H
#include FT_SYNTHESIS_H
#include FT_GLYPH_H
+#include FT_TRUETYPE_TABLES_H
+#include "ass.h"
+#include "ass_library.h"
#include "ass_font.h"
#include "ass_bitmap.h"
#include "ass_cache.h"
#include "ass_fontconfig.h"
-#include "mputils.h"
+#include "ass_utils.h"
/**
* Select Microfost Unicode CharMap, if the font has one.
* Otherwise, let FreeType decide.
*/
-static void charmap_magic(FT_Face face)
+static void charmap_magic(ass_library_t *library, FT_Face face)
{
- int i;
- for (i = 0; i < face->num_charmaps; ++i) {
- FT_CharMap cmap = face->charmaps[i];
- unsigned pid = cmap->platform_id;
- unsigned eid = cmap->encoding_id;
- if (pid == 3 /*microsoft*/ && (eid == 1 /*unicode bmp*/ || eid == 10 /*full unicode*/)) {
- FT_Set_Charmap(face, cmap);
- break;
- }
- }
+ int i;
+ for (i = 0; i < face->num_charmaps; ++i) {
+ FT_CharMap cmap = face->charmaps[i];
+ unsigned pid = cmap->platform_id;
+ unsigned eid = cmap->encoding_id;
+ if (pid == 3 /*microsoft */
+ && (eid == 1 /*unicode bmp */
+ || eid == 10 /*full unicode */ )) {
+ FT_Set_Charmap(face, cmap);
+ return;
+ }
+ }
+
+ if (!face->charmap) {
+ if (face->num_charmaps == 0) {
+ ass_msg(library, MSGL_WARN, "Font face with no charmaps");
+ return;
+ }
+ ass_msg(library, MSGL_WARN,
+ "No charmap autodetected, trying the first one");
+ FT_Set_Charmap(face, face->charmaps[0]);
+ return;
+ }
}
-ass_font_t* ass_font_new(FT_Library ftlibrary, void* fc_priv, ass_font_desc_t* desc)
+static void update_transform(ass_font_t *font)
{
- char* path;
- int index;
- FT_Face face;
- int error;
- ass_font_t* font;
-
- font = ass_font_cache_find(desc);
- if (font)
- return font;
-
- path = fontconfig_select(fc_priv, desc->family, desc->bold, desc->italic, &index);
-
- error = FT_New_Face(ftlibrary, path, index, &face);
- if (error) {
- mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_ErrorOpeningFont, path, index);
- return 0;
- }
-
- charmap_magic(face);
-
- font = calloc(1, sizeof(ass_font_t));
- font->ftlibrary = ftlibrary;
- font->path = strdup(path);
- font->index = index;
- font->face = face;
- font->desc.family = strdup(desc->family);
- font->desc.bold = desc->bold;
- font->desc.italic = desc->italic;
-
- font->m.xx = font->m.yy = (FT_Fixed)0x10000L;
- font->m.xy = font->m.yy = 0;
- font->v.x = font->v.y = 0;
- font->size = 0;
-
-#ifdef HAVE_FONTCONFIG
- font->charset = FcCharSetCreate();
-#endif
+ int i;
+ FT_Matrix m;
+ m.xx = double_to_d16(font->scale_x);
+ m.yy = double_to_d16(font->scale_y);
+ m.xy = m.yx = 0;
+ for (i = 0; i < font->n_faces; ++i)
+ FT_Set_Transform(font->faces[i], &m, &font->v);
+}
- ass_font_cache_add(font);
-
- return font;
+/**
+ * \brief find a memory font by name
+ */
+static int find_font(ass_library_t *library, char *name)
+{
+ int i;
+ for (i = 0; i < library->num_fontdata; ++i)
+ if (strcasecmp(name, library->fontdata[i].name) == 0)
+ return i;
+ return -1;
}
-void ass_font_set_transform(ass_font_t* font, FT_Matrix* m, FT_Vector* v)
+static void face_set_size(FT_Face face, double size);
+
+static void buggy_font_workaround(FT_Face face)
{
- if (font->m.xx != m->xx ||
- font->m.xy != m->xy ||
- font->m.yx != m->yx ||
- font->m.yy != m->yy ||
- font->v.x != v->x ||
- font->v.y != v->y
- ) {
- font->m.xx = m->xx;
- font->m.xy = m->xy;
- font->m.yx = m->yx;
- font->m.yy = m->yy;
- font->v.x = v->x;
- font->v.y = v->y;
- FT_Set_Transform(font->face, &font->m, &font->v);
- }
+ // Some fonts have zero Ascender/Descender fields in 'hhea' table.
+ // In this case, get the information from 'os2' table or, as
+ // a last resort, from face.bbox.
+ if (face->ascender + face->descender == 0 || face->height == 0) {
+ TT_OS2 *os2 = FT_Get_Sfnt_Table(face, ft_sfnt_os2);
+ if (os2) {
+ face->ascender = os2->sTypoAscender;
+ face->descender = os2->sTypoDescender;
+ face->height = face->ascender - face->descender;
+ } else {
+ face->ascender = face->bbox.yMax;
+ face->descender = face->bbox.yMin;
+ face->height = face->ascender - face->descender;
+ }
+ }
}
-void ass_font_set_size(ass_font_t* font, int size)
+/**
+ * \brief Select a face with the given charcode and add it to ass_font_t
+ * \return index of the new face in font->faces, -1 if failed
+ */
+static int add_face(void *fc_priv, ass_font_t *font, uint32_t ch)
{
- if (font->size != size) {
- font->size = size;
- FT_Set_Pixel_Sizes(font->face, 0, size);
- }
+ char *path;
+ int index;
+ FT_Face face;
+ int error;
+ int mem_idx;
+
+ if (font->n_faces == ASS_FONT_MAX_FACES)
+ return -1;
+
+ path =
+ fontconfig_select(font->library, fc_priv, font->desc.family,
+ font->desc.treat_family_as_pattern,
+ font->desc.bold, font->desc.italic, &index, ch);
+ if (!path)
+ return -1;
+
+ mem_idx = find_font(font->library, path);
+ if (mem_idx >= 0) {
+ error =
+ FT_New_Memory_Face(font->ftlibrary,
+ (unsigned char *) font->library->
+ fontdata[mem_idx].data,
+ font->library->fontdata[mem_idx].size, 0,
+ &face);
+ if (error) {
+ ass_msg(font->library, MSGL_WARN,
+ "Error opening memory font: '%s'", path);
+ free(path);
+ return -1;
+ }
+ } else {
+ error = FT_New_Face(font->ftlibrary, path, index, &face);
+ if (error) {
+ ass_msg(font->library, MSGL_WARN,
+ "Error opening font: '%s', %d", path, index);
+ free(path);
+ return -1;
+ }
+ }
+ charmap_magic(font->library, face);
+ buggy_font_workaround(face);
+
+ font->faces[font->n_faces++] = face;
+ update_transform(font);
+ face_set_size(face, font->size);
+ free(path);
+ return font->n_faces - 1;
}
-#ifdef HAVE_FONTCONFIG
-static void ass_font_reselect(void* fontconfig_priv, ass_font_t* font)
+/**
+ * \brief Create a new ass_font_t according to "desc" argument
+ */
+ass_font_t *ass_font_new(void *font_cache, ass_library_t *library,
+ FT_Library ftlibrary, void *fc_priv,
+ ass_font_desc_t *desc)
+{
+ int error;
+ ass_font_t *fontp;
+ ass_font_t font;
+
+ fontp = ass_font_cache_find((hashmap_t *) font_cache, desc);
+ if (fontp)
+ return fontp;
+
+ font.library = library;
+ font.ftlibrary = ftlibrary;
+ font.n_faces = 0;
+ font.desc.family = strdup(desc->family);
+ font.desc.treat_family_as_pattern = desc->treat_family_as_pattern;
+ font.desc.bold = desc->bold;
+ font.desc.italic = desc->italic;
+
+ font.scale_x = font.scale_y = 1.;
+ font.v.x = font.v.y = 0;
+ font.size = 0.;
+
+ error = add_face(fc_priv, &font, 0);
+ if (error == -1) {
+ free(font.desc.family);
+ return 0;
+ } else
+ return ass_font_cache_add((hashmap_t *) font_cache, &font);
+}
+
+/**
+ * \brief Set font transformation matrix and shift vector
+ **/
+void ass_font_set_transform(ass_font_t *font, double scale_x,
+ double scale_y, FT_Vector *v)
{
- char* path;
- int index;
- FT_Face face;
- int error;
-
- path = fontconfig_select_with_charset(fontconfig_priv, font->desc.family, font->desc.bold,
- font->desc.italic, &index, font->charset);
- if (strcasecmp(path, font->path) == 0 && index == font->index) {
- free(path);
- return;
- }
-
- error = FT_New_Face(font->ftlibrary, path, index, &face);
- if (error) {
- mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_ErrorOpeningFont, path, index);
- return;
- }
- charmap_magic(face);
-
- if (font->face) FT_Done_Face(font->face);
- free(font->path);
-
- font->face = face;
- font->path = strdup(path);
- font->index = index;
-
- FT_Set_Transform(font->face, &font->m, &font->v);
- FT_Set_Pixel_Sizes(font->face, 0, font->size);
+ font->scale_x = scale_x;
+ font->scale_y = scale_y;
+ font->v.x = v->x;
+ font->v.y = v->y;
+ update_transform(font);
}
+
+static void face_set_size(FT_Face face, double size)
+{
+#if (FREETYPE_MAJOR > 2) || ((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR > 1))
+ TT_HoriHeader *hori = FT_Get_Sfnt_Table(face, ft_sfnt_hhea);
+ TT_OS2 *os2 = FT_Get_Sfnt_Table(face, ft_sfnt_os2);
+ double mscale = 1.;
+ FT_Size_RequestRec rq;
+ FT_Size_Metrics *m = &face->size->metrics;
+ // VSFilter uses metrics from TrueType OS/2 table
+ // The idea was borrowed from asa (http://asa.diac24.net)
+ if (hori && os2) {
+ int hori_height = hori->Ascender - hori->Descender;
+ int os2_height = os2->usWinAscent + os2->usWinDescent;
+ if (hori_height && os2_height)
+ mscale = (double) hori_height / os2_height;
+ }
+ memset(&rq, 0, sizeof(rq));
+ rq.type = FT_SIZE_REQUEST_TYPE_REAL_DIM;
+ rq.width = 0;
+ rq.height = double_to_d6(size * mscale);
+ rq.horiResolution = rq.vertResolution = 0;
+ FT_Request_Size(face, &rq);
+ m->ascender /= mscale;
+ m->descender /= mscale;
+ m->height /= mscale;
+#else
+ FT_Set_Char_Size(face, 0, double_to_d6(size), 0, 0);
#endif
+}
+
+/**
+ * \brief Set font size
+ **/
+void ass_font_set_size(ass_font_t *font, double size)
+{
+ int i;
+ if (font->size != size) {
+ font->size = size;
+ for (i = 0; i < font->n_faces; ++i)
+ face_set_size(font->faces[i], size);
+ }
+}
+
+/**
+ * \brief Get maximal font ascender and descender.
+ * \param ch character code
+ * The values are extracted from the font face that provides glyphs for the given character
+ **/
+void ass_font_get_asc_desc(ass_font_t *font, uint32_t ch, int *asc,
+ int *desc)
+{
+ int i;
+ for (i = 0; i < font->n_faces; ++i) {
+ FT_Face face = font->faces[i];
+ if (FT_Get_Char_Index(face, ch)) {
+ *asc = face->size->metrics.ascender;
+ *desc = -face->size->metrics.descender;
+ return;
+ }
+ }
-FT_Glyph ass_font_get_glyph(void* fontconfig_priv, ass_font_t* font, uint32_t ch)
+ *asc = *desc = 0;
+}
+
+/*
+ * Strike a glyph with a horizontal line; it's possible to underline it
+ * and/or strike through it. For the line's position and size, truetype
+ * tables are consulted. Obviously this relies on the data in the tables
+ * being accurate.
+ *
+ */
+static int ass_strike_outline_glyph(FT_Face face, ass_font_t *font,
+ FT_Glyph glyph, int under, int through)
{
- int error;
- int index;
- FT_Glyph glyph;
-
- if (ch < 0x20)
- return 0;
-
- index = FT_Get_Char_Index(font->face, ch);
-#ifdef HAVE_FONTCONFIG
- FcCharSetAddChar(font->charset, ch);
- if (index == 0) {
- mp_msg(MSGT_ASS, MSGL_INFO, MSGTR_LIBASS_GlyphNotFoundReselectingFont,
- ch, font->desc.family, font->desc.bold, font->desc.italic);
- ass_font_reselect(fontconfig_priv, font);
- index = FT_Get_Char_Index(font->face, ch);
- if (index == 0) {
- mp_msg(MSGT_ASS, MSGL_ERR, MSGTR_LIBASS_GlyphNotFound,
- ch, font->desc.family, font->desc.bold, font->desc.italic);
- }
- }
+ TT_OS2 *os2 = FT_Get_Sfnt_Table(face, ft_sfnt_os2);
+ TT_Postscript *ps = FT_Get_Sfnt_Table(face, ft_sfnt_post);
+ FT_Outline *ol = &((FT_OutlineGlyph) glyph)->outline;
+ int bear, advance, y_scale, i;
+
+ // Grow outline
+ i = (under ? 4 : 0) + (through ? 4 : 0);
+ ol->points = realloc(ol->points, sizeof(FT_Vector) *
+ (ol->n_points + i));
+ ol->tags = realloc(ol->tags, ol->n_points + i);
+ i = !!under + !!through;
+ ol->contours = realloc(ol->contours, sizeof(short) *
+ (ol->n_contours + i));
+
+ // If the bearing is negative, the glyph starts left of the current
+ // pen position
+ bear = FFMIN(face->glyph->metrics.horiBearingX, 0);
+ // We're adding half a pixel to avoid small gaps
+ advance = d16_to_d6(glyph->advance.x) + 32;
+ y_scale = face->size->metrics.y_scale;
+
+ // Add points to the outline
+ if (under) {
+ int pos, size;
+ pos = FT_MulFix(ps->underlinePosition, y_scale * font->scale_y);
+ size = FT_MulFix(ps->underlineThickness,
+ y_scale * font->scale_y / 2);
+
+ if (pos > 0 || size <= 0)
+ return 0;
+
+ FT_Vector points[4] = {
+ {.x = bear, .y = pos + size},
+ {.x = advance, .y = pos + size},
+ {.x = advance, .y = pos - size},
+ {.x = bear, .y = pos - size},
+ };
+
+ 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;
+ }
+
+ if (through) {
+ int pos, size;
+ pos = FT_MulFix(os2->yStrikeoutPosition, y_scale * font->scale_y);
+ size = FT_MulFix(os2->yStrikeoutSize, y_scale * font->scale_y / 2);
+
+ if (pos < 0 || size <= 0)
+ return 0;
+
+ FT_Vector points[4] = {
+ {.x = bear, .y = pos + size},
+ {.x = advance, .y = pos + size},
+ {.x = advance, .y = pos - size},
+ {.x = bear, .y = pos - size},
+ };
+
+ 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;
+ }
+
+ return 1;
+}
+
+/**
+ * \brief Get a glyph
+ * \param ch character code
+ **/
+FT_Glyph ass_font_get_glyph(void *fontconfig_priv, ass_font_t *font,
+ uint32_t ch, ass_hinting_t hinting, int deco)
+{
+ int error;
+ int index = 0;
+ int i;
+ FT_Glyph glyph;
+ FT_Face face = 0;
+ int flags = 0;
+
+ if (ch < 0x20)
+ return 0;
+ if (font->n_faces == 0)
+ return 0;
+
+ for (i = 0; i < font->n_faces; ++i) {
+ face = font->faces[i];
+ index = FT_Get_Char_Index(face, ch);
+ if (index)
+ break;
+ }
+
+#ifdef CONFIG_FONTCONFIG
+ if (index == 0) {
+ int face_idx;
+ ass_msg(font->library, MSGL_INFO,
+ "Glyph 0x%X not found, selecting one more "
+ "font for (%s, %d, %d)", ch, font->desc.family,
+ font->desc.bold, font->desc.italic);
+ face_idx = add_face(fontconfig_priv, font, ch);
+ if (face_idx >= 0) {
+ face = font->faces[face_idx];
+ index = FT_Get_Char_Index(face, ch);
+ if (index == 0) {
+ ass_msg(font->library, MSGL_ERR,
+ "Glyph 0x%X not found in font for (%s, %d, %d)",
+ ch, font->desc.family, font->desc.bold,
+ font->desc.italic);
+ }
+ }
+ }
#endif
- error = FT_Load_Glyph(font->face, index, FT_LOAD_NO_BITMAP );
- if (error) {
- mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_ErrorLoadingGlyph);
- return 0;
- }
-
+ switch (hinting) {
+ case ASS_HINTING_NONE:
+ flags = FT_LOAD_NO_HINTING;
+ break;
+ case ASS_HINTING_LIGHT:
+ flags = FT_LOAD_FORCE_AUTOHINT | FT_LOAD_TARGET_LIGHT;
+ break;
+ case ASS_HINTING_NORMAL:
+ flags = FT_LOAD_FORCE_AUTOHINT;
+ break;
+ case ASS_HINTING_NATIVE:
+ flags = 0;
+ break;
+ }
+
+ error = FT_Load_Glyph(face, index, FT_LOAD_NO_BITMAP | flags);
+ if (error) {
+ ass_msg(font->library, MSGL_WARN, "Error loading glyph, index %d",
+ index);
+ return 0;
+ }
#if (FREETYPE_MAJOR > 2) || \
((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR >= 2)) || \
((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR == 1) && (FREETYPE_PATCH >= 10))
// FreeType >= 2.1.10 required
- if (!(font->face->style_flags & FT_STYLE_FLAG_ITALIC) &&
- (font->desc.italic > 55)) {
- FT_GlyphSlot_Oblique(font->face->glyph);
- }
+ if (!(face->style_flags & FT_STYLE_FLAG_ITALIC) &&
+ (font->desc.italic > 55)) {
+ FT_GlyphSlot_Oblique(face->glyph);
+ }
#endif
- error = FT_Get_Glyph(font->face->glyph, &glyph);
- if (error) {
- mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_ErrorLoadingGlyph);
- return 0;
- }
-
- return glyph;
+ error = FT_Get_Glyph(face->glyph, &glyph);
+ if (error) {
+ ass_msg(font->library, MSGL_WARN, "Error loading glyph, index %d",
+ index);
+ return 0;
+ }
+
+ ass_strike_outline_glyph(face, font, glyph, deco & DECO_UNDERLINE,
+ deco & DECO_STRIKETHROUGH);
+
+ return glyph;
}
-void ass_font_free(ass_font_t* font)
+/**
+ * \brief Get kerning for the pair of glyphs.
+ **/
+FT_Vector ass_font_get_kerning(ass_font_t *font, uint32_t c1, uint32_t c2)
{
- if (font->face) FT_Done_Face(font->face);
- if (font->path) free(font->path);
- if (font->desc.family) free(font->desc.family);
-#ifdef HAVE_FONTCONFIG
- if (font->charset) FcCharSetDestroy(font->charset);
-#endif
- free(font);
+ FT_Vector v = { 0, 0 };
+ int i;
+
+ 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_t
+ **/
+void ass_font_free(ass_font_t *font)
+{
+ int i;
+ for (i = 0; i < font->n_faces; ++i)
+ if (font->faces[i])
+ FT_Done_Face(font->faces[i]);
+ if (font->desc.family)
+ free(font->desc.family);
+ free(font);
}
projects / libass / blobdiff