diff options
Diffstat (limited to 'Build/source/libs/harfbuzz/harfbuzz-0.9.20/src/hb-ft.cc')
-rw-r--r-- | Build/source/libs/harfbuzz/harfbuzz-0.9.20/src/hb-ft.cc | 494 |
1 files changed, 494 insertions, 0 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-0.9.20/src/hb-ft.cc b/Build/source/libs/harfbuzz/harfbuzz-0.9.20/src/hb-ft.cc new file mode 100644 index 00000000000..a4f4bbdc01c --- /dev/null +++ b/Build/source/libs/harfbuzz/harfbuzz-0.9.20/src/hb-ft.cc @@ -0,0 +1,494 @@ +/* + * 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. + * + * - In the future, we should add constructors to create fonts in font space? + * + * - 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); + return *glyph != 0; + } +#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)) + 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) +{ + 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); + } + + 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_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<hb_font_funcs_t *> (&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; +} |