Edit
kc3-lang/harfbuzz/src/hb-ft.cc
Behdad Esfahbod
- src/hb-ft.cc
-
/* * 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.hh" #ifdef HAVE_FREETYPE #include "hb-ft.h" #include "hb-font.hh" #include "hb-machinery.hh" #include "hb-cache.hh" #include FT_ADVANCES_H #include FT_MULTIPLE_MASTERS_H #include FT_TRUETYPE_TABLES_H /** * SECTION:hb-ft * @title: hb-ft * @short_description: FreeType integration * @include: hb-ft.h * * Functions for using HarfBuzz with the FreeType library. * * HarfBuzz supports using FreeType to provide face and * font data. * * <note>Note that FreeType is not thread-safe, therefore these * functions are not thread-safe either.</note> **/ /* TODO: * * In general, this file does a fine job of what it's supposed to do. * There are, however, things that need more work: * * - 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. * * - We don't handle / allow for emboldening / obliqueing. * * - In the future, we should add constructors to create fonts in font space? */ struct hb_ft_font_t { mutable hb_mutex_t lock; FT_Face ft_face; int load_flags; bool symbol; /* Whether selected cmap is symbol cmap. */ bool unref; /* Whether to destroy ft_face when done. */ mutable hb_atomic_int_t cached_x_scale; mutable hb_advance_cache_t advance_cache; }; 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->lock.init (); 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; ft_font->cached_x_scale.set_relaxed (0); ft_font->advance_cache.init (); 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; ft_font->advance_cache.fini (); if (ft_font->unref) _hb_ft_face_destroy (ft_font->ft_face); ft_font->lock.fini (); free (ft_font); } /** * hb_ft_font_set_load_flags: * @font: #hb_font_t to work upon * @load_flags: The FreeType load flags to set * * Sets the FT_Load_Glyph load flags for the specified #hb_font_t. * * For more information, see * https://www.freetype.org/freetype2/docs/reference/ft2-base_interface.html#ft_load_xxx * * Since: 1.0.5 **/ void hb_ft_font_set_load_flags (hb_font_t *font, int load_flags) { if (hb_object_is_immutable (font)) return; if (unlikely (font->destroy != (hb_destroy_func_t) _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: #hb_font_t to work upon * * Fetches the FT_Load_Glyph load flags of the specified #hb_font_t. * * For more information, see * https://www.freetype.org/freetype2/docs/reference/ft2-base_interface.html#ft_load_xxx * * Return value: FT_Load_Glyph flags found * * Since: 1.0.5 **/ int hb_ft_font_get_load_flags (hb_font_t *font) { if (unlikely (font->destroy != (hb_destroy_func_t) _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; } /** * hb_ft_get_face: * @font: #hb_font_t to work upon * * Fetches the FT_Face associated with the specified #hb_font_t * font object. * * Return value: the FT_Face found * * Since: 0.9.2 **/ FT_Face hb_ft_font_get_face (hb_font_t *font) { if (unlikely (font->destroy != (hb_destroy_func_t) _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; } /** * hb_ft_font_lock_face: * @font: * * * * Return value: * Since: 2.6.5 **/ FT_Face hb_ft_font_lock_face (hb_font_t *font) { if (unlikely (font->destroy != (hb_destroy_func_t) _hb_ft_font_destroy)) return nullptr; const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font->user_data; ft_font->lock.lock (); return ft_font->ft_face; } /** * hb_ft_font_unlock_face: * @font: * * * * Return value: * Since: 2.6.5 **/ void hb_ft_font_unlock_face (hb_font_t *font) { if (unlikely (font->destroy != (hb_destroy_func_t) _hb_ft_font_destroy)) return; const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font->user_data; ft_font->lock.unlock (); } 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; hb_lock_t lock (ft_font->lock); 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: * https://docs.microsoft.com/en-us/typography/opentype/spec/recom * 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 unsigned int hb_ft_get_nominal_glyphs (hb_font_t *font HB_UNUSED, void *font_data, unsigned int count, const hb_codepoint_t *first_unicode, unsigned int unicode_stride, hb_codepoint_t *first_glyph, unsigned int glyph_stride, void *user_data HB_UNUSED) { const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; hb_lock_t lock (ft_font->lock); unsigned int done; for (done = 0; done < count && (*first_glyph = FT_Get_Char_Index (ft_font->ft_face, *first_unicode)); done++) { first_unicode = &StructAtOffsetUnaligned<hb_codepoint_t> (first_unicode, unicode_stride); first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride); } /* We don't need to do ft_font->symbol dance here, since HB calls the singular * nominal_glyph() for what we don't handle here. */ return done; } 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; hb_lock_t lock (ft_font->lock); unsigned int g = FT_Face_GetCharVariantIndex (ft_font->ft_face, unicode, variation_selector); if (unlikely (!g)) return false; *glyph = g; return true; } static void hb_ft_get_glyph_h_advances (hb_font_t* font, void* font_data, unsigned count, const hb_codepoint_t *first_glyph, unsigned glyph_stride, hb_position_t *first_advance, unsigned advance_stride, void *user_data HB_UNUSED) { const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; hb_lock_t lock (ft_font->lock); FT_Face ft_face = ft_font->ft_face; int load_flags = ft_font->load_flags; int mult = font->x_scale < 0 ? -1 : +1; if (font->x_scale != ft_font->cached_x_scale.get ()) { ft_font->advance_cache.clear (); ft_font->cached_x_scale.set (font->x_scale); } for (unsigned int i = 0; i < count; i++) { FT_Fixed v = 0; hb_codepoint_t glyph = *first_glyph; unsigned int cv; if (ft_font->advance_cache.get (glyph, &cv)) v = cv; else { FT_Get_Advance (ft_face, glyph, load_flags, &v); ft_font->advance_cache.set (glyph, v); } *first_advance = (v * mult + (1<<9)) >> 10; first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride); first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride); } } static hb_position_t hb_ft_get_glyph_v_advance (hb_font_t *font, 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; hb_lock_t lock (ft_font->lock); 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, 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; hb_lock_t lock (ft_font->lock); 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; } #ifndef HB_NO_OT_SHAPE_FALLBACK 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; } #endif static hb_bool_t hb_ft_get_glyph_extents (hb_font_t *font, 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; hb_lock_t lock (ft_font->lock); 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; hb_lock_t lock (ft_font->lock); 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_lock_t lock (ft_font->lock); FT_Face ft_face = ft_font->ft_face; hb_bool_t ret = !FT_Get_Glyph_Name (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; hb_lock_t lock (ft_font->lock); 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 = hb_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; hb_lock_t lock (ft_font->lock); FT_Face ft_face = ft_font->ft_face; metrics->ascender = FT_MulFix(ft_face->ascender, ft_face->size->metrics.y_scale); metrics->descender = FT_MulFix(ft_face->descender, ft_face->size->metrics.y_scale); metrics->line_gap = FT_MulFix( ft_face->height, ft_face->size->metrics.y_scale ) - (metrics->ascender - metrics->descender); if (font->y_scale < 0) { metrics->ascender = -metrics->ascender; metrics->descender = -metrics->descender; metrics->line_gap = -metrics->line_gap; } return true; } #if HB_USE_ATEXIT static void free_static_ft_funcs (); #endif static struct hb_ft_font_funcs_lazy_loader_t : hb_font_funcs_lazy_loader_t<hb_ft_font_funcs_lazy_loader_t> { static hb_font_funcs_t *create () { hb_font_funcs_t *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_nominal_glyphs_func (funcs, hb_ft_get_nominal_glyphs, nullptr, nullptr); hb_font_funcs_set_variation_glyph_func (funcs, hb_ft_get_variation_glyph, nullptr, nullptr); hb_font_funcs_set_glyph_h_advances_func (funcs, hb_ft_get_glyph_h_advances, 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); #ifndef HB_NO_OT_SHAPE_FALLBACK hb_font_funcs_set_glyph_h_kerning_func (funcs, hb_ft_get_glyph_h_kerning, nullptr, nullptr); #endif //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_USE_ATEXIT atexit (free_static_ft_funcs); #endif return funcs; } } static_ft_funcs; #if HB_USE_ATEXIT static void free_static_ft_funcs () { static_ft_funcs.free_instance (); } #endif static hb_font_funcs_t * _hb_ft_get_font_funcs () { return static_ft_funcs.get_unconst (); } static void _hb_ft_font_set_funcs (hb_font_t *font, FT_Face ft_face, bool unref) { bool symbol = ft_face->charmap && ft_face->charmap->encoding == FT_ENCODING_MS_SYMBOL; hb_ft_font_t *ft_font = _hb_ft_font_create (ft_face, symbol, unref); if (unlikely (!ft_font)) return; hb_font_set_funcs (font, _hb_ft_get_font_funcs (), ft_font, _hb_ft_font_destroy); } static hb_blob_t * _hb_ft_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) { free (buffer); 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): FT_Face to work upon * @destroy: A callback to call when the face object is not needed anymore * * Creates an #hb_face_t face object from the specified FT_Face. * * This variant of the function does not provide any life-cycle management. * * Most client programs should use hb_ft_face_create_referenced() * (or, perhaps, hb_ft_face_create_cached()) instead. * * If you know you have valid reasons not to use hb_ft_face_create_referenced(), * then it is the client program's responsibility to destroy @ft_face * after the #hb_face_t face object has been destroyed. * * Return value: (transfer full): the new #hb_face_t face object * * 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 (_hb_ft_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: FT_Face to work upon * * Creates an #hb_face_t face object from the specified FT_Face. * * This is the preferred variant of the hb_ft_face_create* * function family, because it calls FT_Reference_Face() on @ft_face, * ensuring that @ft_face remains alive as long as the resulting * #hb_face_t face object remains alive. Also calls FT_Done_Face() * when the #hb_face_t face object is destroyed. * * Use this version unless you know you have good reasons not to. * * Return value: (transfer full): the new #hb_face_t face object * * 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: FT_Face to work upon * * Creates an #hb_face_t face object from the specified FT_Face. * * This variant of the function caches the newly created #hb_face_t * face object, using the @generic pointer of @ft_face. Subsequent function * calls that are passed the same @ft_face parameter will have the same * #hb_face_t returned to them, and that #hb_face_t will be correctly * reference counted. * * However, client programs are still responsible for destroying * @ft_face after the last #hb_face_t face object has been destroyed. * * Return value: (transfer full): the new #hb_face_t face object * * 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): FT_Face to work upon * @destroy: (optional): A callback to call when the font object is not needed anymore * * Creates an #hb_font_t font object from the specified FT_Face. * * <note>Note: You must set the face size on @ft_face before calling * hb_ft_font_create() on it. Otherwise, HarfBuzz will not pick up * the face size.</note> * * This variant of the function does not provide any life-cycle management. * * Most client programs should use hb_ft_font_create_referenced() * instead. * * If you know you have valid reasons not to use hb_ft_font_create_referenced(), * then it is the client program's responsibility to destroy @ft_face * after the #hb_font_t font object has been destroyed. * * HarfBuzz will use the @destroy callback on the #hb_font_t font object * if it is supplied when you use this function. However, even if @destroy * is provided, it is the client program's responsibility to destroy @ft_face, * and it is the client program's responsibility to ensure that @ft_face is * destroyed only after the #hb_font_t font object has been destroyed. * * Return value: (transfer full): the new #hb_font_t font object * * 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; } /** * hb_ft_font_has_changed: * @font: #hb_font_t to work upon * * Refreshes the state of @font when the underlying FT_Face has changed. * This function should be called after changing the size or * variation-axis settings on the FT_Face. * * Since: 1.0.5 **/ void hb_ft_font_changed (hb_font_t *font) { if (font->destroy != (hb_destroy_func_t) _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 #if defined(HAVE_FT_GET_VAR_BLEND_COORDINATES) && !defined(HB_NO_VAR) 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: FT_Face to work upon * * Creates an #hb_font_t font object from the specified FT_Face. * * <note>Note: You must set the face size on @ft_face before calling * hb_ft_font_create_references() on it. Otherwise, HarfBuzz will not pick up * the face size.</note> * * This is the preferred variant of the hb_ft_font_create* * function family, because it calls FT_Reference_Face() on @ft_face, * ensuring that @ft_face remains alive as long as the resulting * #hb_font_t font object remains alive. * * Use this version unless you know you have good reasons not to. * * Return value: (transfer full): the new #hb_font_t font object * * 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); } #if HB_USE_ATEXIT static void free_static_ft_library (); #endif static struct hb_ft_library_lazy_loader_t : hb_lazy_loader_t<hb_remove_pointer<FT_Library>, hb_ft_library_lazy_loader_t> { static FT_Library create () { FT_Library l; if (FT_Init_FreeType (&l)) return nullptr; #if HB_USE_ATEXIT atexit (free_static_ft_library); #endif return l; } static void destroy (FT_Library l) { FT_Done_FreeType (l); } static FT_Library get_null () { return nullptr; } } static_ft_library; #if HB_USE_ATEXIT static void free_static_ft_library () { static_ft_library.free_instance (); } #endif static FT_Library get_ft_library () { return static_ft_library.get_unconst (); } static void _release_blob (FT_Face ft_face) { hb_blob_destroy ((hb_blob_t *) ft_face->generic.data); } /** * hb_ft_font_set_funcs: * @font: #hb_font_t to work upon * * Configures the font-functions structure of the specified * #hb_font_t font object to use FreeType font functions. * * In particular, you can use this function to configure an * existing #hb_face_t face object for use with FreeType font * functions even if that #hb_face_t face object was initially * created with hb_face_create(), and therefore was not * initially configured to use FreeType font functions. * * An #hb_face_t face object created with hb_ft_face_create() * is preconfigured for FreeType font functions and does not * require this function to be used. * * <note>Note: Internally, this function creates an FT_Face. * </note> * * Since: 1.0.5 **/ 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_MS_SYMBOL)) FT_Select_Charmap (ft_face, FT_ENCODING_UNICODE); 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); } #if defined(HAVE_FT_GET_VAR_BLEND_COORDINATES) && !defined(HB_NO_VAR) 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] * 4; 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); } #endif