/* * Copyright © 2009 Red Hat, Inc. * Copyright © 2009 Keith Stribley * Copyright © 2015 Google, Inc. * * This is part of HarfBuzz, a text shaping library. * * Permission is hereby granted, without written agreement and without * license or royalty fees, to use, copy, modify, and distribute this * software and its documentation for any purpose, provided that the * above copyright notice and the following two paragraphs appear in * all copies of this software. * * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. * * Red Hat Author(s): Behdad Esfahbod * Google Author(s): Behdad Esfahbod */ #include "hb-private.hh" #include "hb-debug.hh" #include "hb-ft.h" #include "hb-font-private.hh" #include FT_ADVANCES_H #include FT_MULTIPLE_MASTERS_H #include FT_TRUETYPE_TABLES_H /* TODO: * * In general, this file does a fine job of what it's supposed to do. * There are, however, things that need more work: * * - I remember seeing FT_Get_Advance() without the NO_HINTING flag to be buggy. * Have not investigated. * * - FreeType works in 26.6 mode. Clients can decide to use that mode, and everything * would work fine. However, we also abuse this API for performing in font-space, * but don't pass the correct flags to FreeType. We just abuse the no-hinting mode * for that, such that no rounding etc happens. As such, we don't set ppem, and * pass NO_HINTING as load_flags. Would be much better to use NO_SCALE, and scale * ourselves, like we do in uniscribe, etc. * * - We don't handle / allow for emboldening / obliqueing. * * - In the future, we should add constructors to create fonts in font space? * * - FT_Load_Glyph() is extremely costly. Do something about it? */ struct hb_ft_font_t { FT_Face ft_face; int load_flags; bool symbol; /* Whether selected cmap is symbol cmap. */ bool unref; /* Whether to destroy ft_face when done. */ }; static hb_ft_font_t * _hb_ft_font_create (FT_Face ft_face, bool symbol, bool unref) { hb_ft_font_t *ft_font = (hb_ft_font_t *) calloc (1, sizeof (hb_ft_font_t)); if (unlikely (!ft_font)) return nullptr; ft_font->ft_face = ft_face; ft_font->symbol = symbol; ft_font->unref = unref; ft_font->load_flags = FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING; return ft_font; } static void _hb_ft_face_destroy (void *data) { FT_Done_Face ((FT_Face) data); } static void _hb_ft_font_destroy (void *data) { hb_ft_font_t *ft_font = (hb_ft_font_t *) data; if (ft_font->unref) _hb_ft_face_destroy (ft_font->ft_face); free (ft_font); } /** * hb_ft_font_set_load_flags: * @font: * @load_flags: * * * * Since: 1.0.5 **/ void hb_ft_font_set_load_flags (hb_font_t *font, int load_flags) { if (font->immutable) return; if (font->destroy != _hb_ft_font_destroy) return; hb_ft_font_t *ft_font = (hb_ft_font_t *) font->user_data; ft_font->load_flags = load_flags; } /** * hb_ft_font_get_load_flags: * @font: * * * * Return value: * Since: 1.0.5 **/ int hb_ft_font_get_load_flags (hb_font_t *font) { if (font->destroy != _hb_ft_font_destroy) return 0; const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font->user_data; return ft_font->load_flags; } FT_Face hb_ft_font_get_face (hb_font_t *font) { if (font->destroy != _hb_ft_font_destroy) return nullptr; const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font->user_data; return ft_font->ft_face; } static hb_bool_t hb_ft_get_nominal_glyph (hb_font_t *font HB_UNUSED, void *font_data, hb_codepoint_t unicode, hb_codepoint_t *glyph, void *user_data HB_UNUSED) { const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; unsigned int g = FT_Get_Char_Index (ft_font->ft_face, unicode); if (unlikely (!g)) { if (unlikely (ft_font->symbol) && unicode <= 0x00FFu) { /* For symbol-encoded OpenType fonts, we duplicate the * U+F000..F0FF range at U+0000..U+00FF. That's what * Windows seems to do, and that's hinted about at: * http://www.microsoft.com/typography/otspec/recom.htm * under "Non-Standard (Symbol) Fonts". */ g = FT_Get_Char_Index (ft_font->ft_face, 0xF000u + unicode); if (!g) return false; } else return false; } *glyph = g; return true; } static hb_bool_t hb_ft_get_variation_glyph (hb_font_t *font HB_UNUSED, void *font_data, hb_codepoint_t unicode, hb_codepoint_t variation_selector, hb_codepoint_t *glyph, void *user_data HB_UNUSED) { const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; unsigned int g = FT_Face_GetCharVariantIndex (ft_font->ft_face, unicode, variation_selector); if (unlikely (!g)) return false; *glyph = g; return true; } static hb_position_t hb_ft_get_glyph_h_advance (hb_font_t *font HB_UNUSED, void *font_data, hb_codepoint_t glyph, void *user_data HB_UNUSED) { const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; FT_Fixed v; if (unlikely (FT_Get_Advance (ft_font->ft_face, glyph, ft_font->load_flags, &v))) return 0; if (font->x_scale < 0) v = -v; return (v + (1<<9)) >> 10; } static hb_position_t hb_ft_get_glyph_v_advance (hb_font_t *font HB_UNUSED, void *font_data, hb_codepoint_t glyph, void *user_data HB_UNUSED) { const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; FT_Fixed v; if (unlikely (FT_Get_Advance (ft_font->ft_face, glyph, ft_font->load_flags | FT_LOAD_VERTICAL_LAYOUT, &v))) return 0; if (font->y_scale < 0) v = -v; /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates * have a Y growing upward. Hence the extra negation. */ return (-v + (1<<9)) >> 10; } static hb_bool_t hb_ft_get_glyph_v_origin (hb_font_t *font HB_UNUSED, void *font_data, hb_codepoint_t glyph, hb_position_t *x, hb_position_t *y, void *user_data HB_UNUSED) { const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; FT_Face ft_face = ft_font->ft_face; if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags))) return false; /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates * have a Y growing upward. Hence the extra negation. */ *x = ft_face->glyph->metrics.horiBearingX - ft_face->glyph->metrics.vertBearingX; *y = ft_face->glyph->metrics.horiBearingY - (-ft_face->glyph->metrics.vertBearingY); if (font->x_scale < 0) *x = -*x; if (font->y_scale < 0) *y = -*y; return true; } static hb_position_t hb_ft_get_glyph_h_kerning (hb_font_t *font, void *font_data, hb_codepoint_t left_glyph, hb_codepoint_t right_glyph, void *user_data HB_UNUSED) { const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; FT_Vector kerningv; FT_Kerning_Mode mode = font->x_ppem ? FT_KERNING_DEFAULT : FT_KERNING_UNFITTED; if (FT_Get_Kerning (ft_font->ft_face, left_glyph, right_glyph, mode, &kerningv)) return 0; return kerningv.x; } static hb_bool_t hb_ft_get_glyph_extents (hb_font_t *font HB_UNUSED, void *font_data, hb_codepoint_t glyph, hb_glyph_extents_t *extents, void *user_data HB_UNUSED) { const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; FT_Face ft_face = ft_font->ft_face; if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags))) return false; extents->x_bearing = ft_face->glyph->metrics.horiBearingX; extents->y_bearing = ft_face->glyph->metrics.horiBearingY; extents->width = ft_face->glyph->metrics.width; extents->height = -ft_face->glyph->metrics.height; if (font->x_scale < 0) { extents->x_bearing = -extents->x_bearing; extents->width = -extents->width; } if (font->y_scale < 0) { extents->y_bearing = -extents->y_bearing; extents->height = -extents->height; } return true; } static hb_bool_t hb_ft_get_glyph_contour_point (hb_font_t *font HB_UNUSED, void *font_data, hb_codepoint_t glyph, unsigned int point_index, hb_position_t *x, hb_position_t *y, void *user_data HB_UNUSED) { const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; FT_Face ft_face = ft_font->ft_face; if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags))) return false; if (unlikely (ft_face->glyph->format != FT_GLYPH_FORMAT_OUTLINE)) return false; if (unlikely (point_index >= (unsigned int) ft_face->glyph->outline.n_points)) return false; *x = ft_face->glyph->outline.points[point_index].x; *y = ft_face->glyph->outline.points[point_index].y; return true; } static hb_bool_t hb_ft_get_glyph_name (hb_font_t *font HB_UNUSED, void *font_data, hb_codepoint_t glyph, char *name, unsigned int size, void *user_data HB_UNUSED) { const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; hb_bool_t ret = !FT_Get_Glyph_Name (ft_font->ft_face, glyph, name, size); if (ret && (size && !*name)) ret = false; return ret; } static hb_bool_t hb_ft_get_glyph_from_name (hb_font_t *font HB_UNUSED, void *font_data, const char *name, int len, /* -1 means nul-terminated */ hb_codepoint_t *glyph, void *user_data HB_UNUSED) { const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; FT_Face ft_face = ft_font->ft_face; if (len < 0) *glyph = FT_Get_Name_Index (ft_face, (FT_String *) name); else { /* Make a nul-terminated version. */ char buf[128]; len = MIN (len, (int) sizeof (buf) - 1); strncpy (buf, name, len); buf[len] = '\0'; *glyph = FT_Get_Name_Index (ft_face, buf); } if (*glyph == 0) { /* Check whether the given name was actually the name of glyph 0. */ char buf[128]; if (!FT_Get_Glyph_Name(ft_face, 0, buf, sizeof (buf)) && len < 0 ? !strcmp (buf, name) : !strncmp (buf, name, len)) return true; } return *glyph != 0; } static hb_bool_t hb_ft_get_font_h_extents (hb_font_t *font HB_UNUSED, void *font_data, hb_font_extents_t *metrics, void *user_data HB_UNUSED) { const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; FT_Face ft_face = ft_font->ft_face; metrics->ascender = ft_face->size->metrics.ascender; metrics->descender = ft_face->size->metrics.descender; metrics->line_gap = ft_face->size->metrics.height - (ft_face->size->metrics.ascender - ft_face->size->metrics.descender); if (font->y_scale < 0) { metrics->ascender = -metrics->ascender; metrics->descender = -metrics->descender; metrics->line_gap = -metrics->line_gap; } return true; } static hb_font_funcs_t *static_ft_funcs = nullptr; #ifdef HB_USE_ATEXIT static void free_static_ft_funcs (void) { hb_font_funcs_destroy (static_ft_funcs); } #endif static void _hb_ft_font_set_funcs (hb_font_t *font, FT_Face ft_face, bool unref) { retry: hb_font_funcs_t *funcs = (hb_font_funcs_t *) hb_atomic_ptr_get (&static_ft_funcs); if (unlikely (!funcs)) { funcs = hb_font_funcs_create (); hb_font_funcs_set_font_h_extents_func (funcs, hb_ft_get_font_h_extents, nullptr, nullptr); //hb_font_funcs_set_font_v_extents_func (funcs, hb_ft_get_font_v_extents, nullptr, nullptr); hb_font_funcs_set_nominal_glyph_func (funcs, hb_ft_get_nominal_glyph, nullptr, nullptr); hb_font_funcs_set_variation_glyph_func (funcs, hb_ft_get_variation_glyph, nullptr, nullptr); hb_font_funcs_set_glyph_h_advance_func (funcs, hb_ft_get_glyph_h_advance, nullptr, nullptr); hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ft_get_glyph_v_advance, nullptr, nullptr); //hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ft_get_glyph_h_origin, nullptr, nullptr); hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ft_get_glyph_v_origin, nullptr, nullptr); hb_font_funcs_set_glyph_h_kerning_func (funcs, hb_ft_get_glyph_h_kerning, nullptr, nullptr); //hb_font_funcs_set_glyph_v_kerning_func (funcs, hb_ft_get_glyph_v_kerning, nullptr, nullptr); hb_font_funcs_set_glyph_extents_func (funcs, hb_ft_get_glyph_extents, nullptr, nullptr); hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ft_get_glyph_contour_point, nullptr, nullptr); hb_font_funcs_set_glyph_name_func (funcs, hb_ft_get_glyph_name, nullptr, nullptr); hb_font_funcs_set_glyph_from_name_func (funcs, hb_ft_get_glyph_from_name, nullptr, nullptr); hb_font_funcs_make_immutable (funcs); if (!hb_atomic_ptr_cmpexch (&static_ft_funcs, nullptr, funcs)) { hb_font_funcs_destroy (funcs); goto retry; } #ifdef HB_USE_ATEXIT atexit (free_static_ft_funcs); /* First person registers atexit() callback. */ #endif }; bool symbol = ft_face->charmap && ft_face->charmap->encoding == FT_ENCODING_MS_SYMBOL; hb_font_set_funcs (font, funcs, _hb_ft_font_create (ft_face, symbol, unref), _hb_ft_font_destroy); } static hb_blob_t * reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data) { FT_Face ft_face = (FT_Face) user_data; FT_Byte *buffer; FT_ULong length = 0; FT_Error error; /* Note: FreeType like HarfBuzz uses the NONE tag for fetching the entire blob */ error = FT_Load_Sfnt_Table (ft_face, tag, 0, nullptr, &length); if (error) return nullptr; buffer = (FT_Byte *) malloc (length); if (!buffer) return nullptr; error = FT_Load_Sfnt_Table (ft_face, tag, 0, buffer, &length); if (error) return nullptr; return hb_blob_create ((const char *) buffer, length, HB_MEMORY_MODE_WRITABLE, buffer, free); } /** * hb_ft_face_create: * @ft_face: (destroy destroy) (scope notified): * @destroy: * * * * Return value: (transfer full): * Since: 0.9.2 **/ hb_face_t * hb_ft_face_create (FT_Face ft_face, hb_destroy_func_t destroy) { hb_face_t *face; if (!ft_face->stream->read) { hb_blob_t *blob; blob = hb_blob_create ((const char *) ft_face->stream->base, (unsigned int) ft_face->stream->size, HB_MEMORY_MODE_READONLY, ft_face, destroy); face = hb_face_create (blob, ft_face->face_index); hb_blob_destroy (blob); } else { face = hb_face_create_for_tables (reference_table, ft_face, destroy); } hb_face_set_index (face, ft_face->face_index); hb_face_set_upem (face, ft_face->units_per_EM); return face; } /** * hb_ft_face_create_referenced: * @ft_face: * * * * Return value: (transfer full): * Since: 0.9.38 **/ hb_face_t * hb_ft_face_create_referenced (FT_Face ft_face) { FT_Reference_Face (ft_face); return hb_ft_face_create (ft_face, _hb_ft_face_destroy); } static void hb_ft_face_finalize (FT_Face ft_face) { hb_face_destroy ((hb_face_t *) ft_face->generic.data); } /** * hb_ft_face_create_cached: * @ft_face: * * * * Return value: (transfer full): * Since: 0.9.2 **/ hb_face_t * hb_ft_face_create_cached (FT_Face ft_face) { if (unlikely (!ft_face->generic.data || ft_face->generic.finalizer != (FT_Generic_Finalizer) hb_ft_face_finalize)) { if (ft_face->generic.finalizer) ft_face->generic.finalizer (ft_face); ft_face->generic.data = hb_ft_face_create (ft_face, nullptr); ft_face->generic.finalizer = (FT_Generic_Finalizer) hb_ft_face_finalize; } return hb_face_reference ((hb_face_t *) ft_face->generic.data); } /** * hb_ft_font_create: * @ft_face: (destroy destroy) (scope notified): * @destroy: * * * * Return value: (transfer full): * Since: 0.9.2 **/ hb_font_t * hb_ft_font_create (FT_Face ft_face, hb_destroy_func_t destroy) { hb_font_t *font; hb_face_t *face; face = hb_ft_face_create (ft_face, destroy); font = hb_font_create (face); hb_face_destroy (face); _hb_ft_font_set_funcs (font, ft_face, false); hb_ft_font_changed (font); return font; } void hb_ft_font_changed (hb_font_t *font) { if (font->destroy != _hb_ft_font_destroy) return; hb_ft_font_t *ft_font = (hb_ft_font_t *) font->user_data; FT_Face ft_face = ft_font->ft_face; hb_font_set_scale (font, (int) (((uint64_t) ft_face->size->metrics.x_scale * (uint64_t) ft_face->units_per_EM + (1u<<15)) >> 16), (int) (((uint64_t) ft_face->size->metrics.y_scale * (uint64_t) ft_face->units_per_EM + (1u<<15)) >> 16)); #if 0 /* hb-ft works in no-hinting model */ hb_font_set_ppem (font, ft_face->size->metrics.x_ppem, ft_face->size->metrics.y_ppem); #endif #ifdef HAVE_FT_GET_VAR_BLEND_COORDINATES FT_MM_Var *mm_var = nullptr; if (!FT_Get_MM_Var (ft_face, &mm_var)) { FT_Fixed *ft_coords = (FT_Fixed *) calloc (mm_var->num_axis, sizeof (FT_Fixed)); int *coords = (int *) calloc (mm_var->num_axis, sizeof (int)); if (coords && ft_coords) { if (!FT_Get_Var_Blend_Coordinates (ft_face, mm_var->num_axis, ft_coords)) { bool nonzero = false; for (unsigned int i = 0; i < mm_var->num_axis; ++i) { coords[i] = ft_coords[i] >>= 2; nonzero = nonzero || coords[i]; } if (nonzero) hb_font_set_var_coords_normalized (font, coords, mm_var->num_axis); else hb_font_set_var_coords_normalized (font, nullptr, 0); } } free (coords); free (ft_coords); #ifdef HAVE_FT_DONE_MM_VAR FT_Done_MM_Var (ft_face->glyph->library, mm_var); #else free (mm_var); #endif } #endif } /** * hb_ft_font_create_referenced: * @ft_face: * * * * Return value: (transfer full): * Since: 0.9.38 **/ hb_font_t * hb_ft_font_create_referenced (FT_Face ft_face) { FT_Reference_Face (ft_face); return hb_ft_font_create (ft_face, _hb_ft_face_destroy); } /* Thread-safe, lock-free, FT_Library */ static FT_Library ft_library; #ifdef HB_USE_ATEXIT static void free_ft_library (void) { FT_Done_FreeType (ft_library); } #endif static FT_Library get_ft_library (void) { retry: FT_Library library = (FT_Library) hb_atomic_ptr_get (&ft_library); if (unlikely (!library)) { /* Not found; allocate one. */ if (FT_Init_FreeType (&library)) return nullptr; if (!hb_atomic_ptr_cmpexch (&ft_library, nullptr, library)) { FT_Done_FreeType (library); goto retry; } #ifdef HB_USE_ATEXIT atexit (free_ft_library); /* First person registers atexit() callback. */ #endif } return library; } static void _release_blob (FT_Face ft_face) { hb_blob_destroy ((hb_blob_t *) ft_face->generic.data); } void hb_ft_font_set_funcs (hb_font_t *font) { hb_blob_t *blob = hb_face_reference_blob (font->face); unsigned int blob_length; const char *blob_data = hb_blob_get_data (blob, &blob_length); if (unlikely (!blob_length)) DEBUG_MSG (FT, font, "Font face has empty blob"); FT_Face ft_face = nullptr; FT_Error err = FT_New_Memory_Face (get_ft_library (), (const FT_Byte *) blob_data, blob_length, hb_face_get_index (font->face), &ft_face); if (unlikely (err)) { hb_blob_destroy (blob); DEBUG_MSG (FT, font, "Font face FT_New_Memory_Face() failed"); return; } if (FT_Select_Charmap (ft_face, FT_ENCODING_UNICODE)) FT_Select_Charmap (ft_face, FT_ENCODING_MS_SYMBOL); FT_Set_Char_Size (ft_face, abs (font->x_scale), abs (font->y_scale), 0, 0); #if 0 font->x_ppem * 72 * 64 / font->x_scale, font->y_ppem * 72 * 64 / font->y_scale); #endif if (font->x_scale < 0 || font->y_scale < 0) { FT_Matrix matrix = { font->x_scale < 0 ? -1 : +1, 0, 0, font->y_scale < 0 ? -1 : +1}; FT_Set_Transform (ft_face, &matrix, nullptr); } #ifdef HAVE_FT_SET_VAR_BLEND_COORDINATES unsigned int num_coords; const int *coords = hb_font_get_var_coords_normalized (font, &num_coords); if (num_coords) { FT_Fixed *ft_coords = (FT_Fixed *) calloc (num_coords, sizeof (FT_Fixed)); if (ft_coords) { for (unsigned int i = 0; i < num_coords; i++) ft_coords[i] = coords[i] << 2; FT_Set_Var_Blend_Coordinates (ft_face, num_coords, ft_coords); free (ft_coords); } } #endif ft_face->generic.data = blob; ft_face->generic.finalizer = (FT_Generic_Finalizer) _release_blob; _hb_ft_font_set_funcs (font, ft_face, true); hb_ft_font_set_load_flags (font, FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING); }