/* * Copyright © 2009 Red Hat, Inc. * Copyright © 2009 Keith Stribley * * 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 */ #include "hb-private.hh" #include "hb-ft.h" #include "hb-font-private.hh" #include FT_ADVANCES_H #include FT_TRUETYPE_TABLES_H #ifndef HB_DEBUG_FT #define HB_DEBUG_FT (HB_DEBUG+0) #endif /* TODO: * * In general, this file does a fine job of what it's supposed to do. * There are, however, things that need more work: * * - We don't handle any load_flags. That definitely has API implications. :( * I believe hb_ft_font_create() should take load_flags input. * In particular, FT_Get_Advance() without the NO_HINTING flag seems to be * buggy. * * - We don't handle / allow for emboldening / obliqueing. * * - Rounding, etc? * * - In the future, we should add constructors to create fonts in font space. * * - I believe transforms are not correctly implemented. FreeType does not * provide any API to get to the transform/delta set on the face. :( * * - Always use FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH? * * - FT_Load_Glyph() is exteremely costly. Do something about it? */ static hb_bool_t hb_ft_get_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) { FT_Face ft_face = (FT_Face) font_data; #ifdef HAVE_FT_FACE_GETCHARVARIANTINDEX if (unlikely (variation_selector)) { *glyph = FT_Face_GetCharVariantIndex (ft_face, unicode, variation_selector); if (*glyph) return true; } #endif *glyph = FT_Get_Char_Index (ft_face, unicode); return *glyph != 0; } 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) { FT_Face ft_face = (FT_Face) font_data; int load_flags = FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING; FT_Fixed v; if (unlikely (FT_Get_Advance (ft_face, glyph, load_flags, &v))) return 0; return v >> 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) { FT_Face ft_face = (FT_Face) font_data; int load_flags = FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING | FT_LOAD_VERTICAL_LAYOUT; FT_Fixed v; if (unlikely (FT_Get_Advance (ft_face, glyph, load_flags, &v))) return 0; /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates * have a Y growing upward. Hence the extra negation. */ return -v >> 10; } static hb_bool_t hb_ft_get_glyph_h_origin (hb_font_t *font HB_UNUSED, void *font_data HB_UNUSED, hb_codepoint_t glyph HB_UNUSED, hb_position_t *x HB_UNUSED, hb_position_t *y HB_UNUSED, void *user_data HB_UNUSED) { /* We always work in the horizontal coordinates. */ return true; } 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) { FT_Face ft_face = (FT_Face) font_data; int load_flags = FT_LOAD_DEFAULT; if (unlikely (FT_Load_Glyph (ft_face, glyph, 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); 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) { FT_Face ft_face = (FT_Face) font_data; FT_Vector kerningv; FT_Kerning_Mode mode = font->x_ppem ? FT_KERNING_DEFAULT : FT_KERNING_UNFITTED; if (FT_Get_Kerning (ft_face, left_glyph, right_glyph, mode, &kerningv)) return 0; return kerningv.x; } static hb_position_t hb_ft_get_glyph_v_kerning (hb_font_t *font HB_UNUSED, void *font_data HB_UNUSED, hb_codepoint_t top_glyph HB_UNUSED, hb_codepoint_t bottom_glyph HB_UNUSED, void *user_data HB_UNUSED) { /* FreeType API doesn't support vertical kerning */ return 0; } 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) { FT_Face ft_face = (FT_Face) font_data; int load_flags = FT_LOAD_DEFAULT; if (unlikely (FT_Load_Glyph (ft_face, glyph, 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; 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) { FT_Face ft_face = (FT_Face) font_data; int load_flags = FT_LOAD_DEFAULT; if (unlikely (FT_Load_Glyph (ft_face, glyph, 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) { FT_Face ft_face = (FT_Face) font_data; hb_bool_t ret = !FT_Get_Glyph_Name (ft_face, glyph, name, size); if (!ret || (size && !*name)) snprintf (name, size, "gid%u", glyph); 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) { FT_Face ft_face = (FT_Face) font_data; 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); } return *glyph != 0; } static hb_font_funcs_t * _hb_ft_get_font_funcs (void) { static const hb_font_funcs_t ft_ffuncs = { HB_OBJECT_HEADER_STATIC, true, /* immutable */ { #define HB_FONT_FUNC_IMPLEMENT(name) hb_ft_get_##name, HB_FONT_FUNCS_IMPLEMENT_CALLBACKS #undef HB_FONT_FUNC_IMPLEMENT } }; return const_cast (&ft_ffuncs); } 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, NULL, &length); if (error) return NULL; buffer = (FT_Byte *) malloc (length); if (buffer == NULL) return NULL; error = FT_Load_Sfnt_Table (ft_face, tag, 0, buffer, &length); if (error) return NULL; return hb_blob_create ((const char *) buffer, length, HB_MEMORY_MODE_WRITABLE, buffer, free); } 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 == NULL) { hb_blob_t *blob; blob = hb_blob_create ((const char *) ft_face->stream->base, (unsigned int) ft_face->stream->size, /* TODO: We assume that it's mmap()'ed, but FreeType code * suggests that there are cases we reach here but font is * not mmapped. For example, when mmap() fails. No idea * how to deal with it better here. */ HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE, 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; } static void hb_ft_face_finalize (FT_Face ft_face) { hb_face_destroy ((hb_face_t *) ft_face->generic.data); } 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, NULL); ft_face->generic.finalizer = (FT_Generic_Finalizer) hb_ft_face_finalize; } return hb_face_reference ((hb_face_t *) ft_face->generic.data); } static void _do_nothing (void) { } 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_font_set_funcs (font, _hb_ft_get_font_funcs (), ft_face, (hb_destroy_func_t) _do_nothing); hb_font_set_scale (font, ((uint64_t) ft_face->size->metrics.x_scale * (uint64_t) ft_face->units_per_EM) >> 16, ((uint64_t) ft_face->size->metrics.y_scale * (uint64_t) ft_face->units_per_EM) >> 16); hb_font_set_ppem (font, ft_face->size->metrics.x_ppem, ft_face->size->metrics.y_ppem); return font; } /* Thread-safe, lock-free, FT_Library */ static FT_Library ft_library; static inline void free_ft_library (void) { FT_Done_FreeType (ft_library); } 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 NULL; if (!hb_atomic_ptr_cmpexch (&ft_library, NULL, library)) { FT_Done_FreeType (library); goto retry; } #ifdef HAVE_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 = NULL; 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; } FT_Select_Charmap (ft_face, FT_ENCODING_UNICODE); assert (font->y_scale >= 0); FT_Set_Char_Size (ft_face, font->x_scale, font->y_scale, 0, 0); #if 0 font->x_ppem * 72 * 64 / font->x_scale, font->y_ppem * 72 * 64 / font->y_scale); #endif ft_face->generic.data = blob; ft_face->generic.finalizer = (FT_Generic_Finalizer) _release_blob; hb_font_set_funcs (font, _hb_ft_get_font_funcs (), ft_face, (hb_destroy_func_t) FT_Done_Face); } FT_Face hb_ft_font_get_face (hb_font_t *font) { if (font->destroy == (hb_destroy_func_t) FT_Done_Face || font->destroy == (hb_destroy_func_t) _do_nothing) return (FT_Face) font->user_data; return NULL; }