HarfBuzz text shaping engine
http://harfbuzz.github.io/
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130 lines
3.6 KiB
130 lines
3.6 KiB
/* |
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* Copyright © 2022 Google, Inc. |
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* |
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* This is part of HarfBuzz, a text shaping library. |
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* |
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* Permission is hereby granted, without written agreement and without |
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* license or royalty fees, to use, copy, modify, and distribute this |
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* software and its documentation for any purpose, provided that the |
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* above copyright notice and the following two paragraphs appear in |
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* all copies of this software. |
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* |
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
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* DAMAGE. |
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* |
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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* |
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* Google Author(s): Behdad Esfahbod |
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*/ |
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#ifndef HELPER_CAIRO_FT_HH |
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#define HELPER_CAIRO_FT_HH |
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#include "font-options.hh" |
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#include <cairo-ft.h> |
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#include <hb-ft.h> |
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#include FT_MULTIPLE_MASTERS_H |
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static FT_Library ft_library; |
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#ifdef HAVE_ATEXIT |
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static inline |
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void free_ft_library () |
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{ |
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FT_Done_FreeType (ft_library); |
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} |
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#endif |
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static void |
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_release_blob (void *arg) |
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{ |
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FT_Face ft_face = (FT_Face) arg; |
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hb_blob_destroy ((hb_blob_t *) ft_face->generic.data); |
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} |
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static inline cairo_font_face_t * |
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helper_cairo_create_ft_font_face (const font_options_t *font_opts) |
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{ |
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cairo_font_face_t *cairo_face; |
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/* We cannot use the FT_Face from hb_font_t, as doing so will confuse hb_font_t because |
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* cairo will reset the face size. As such, create new face... |
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* TODO Perhaps add API to hb-ft to encapsulate this code. */ |
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FT_Face ft_face = nullptr;//hb_ft_font_get_face (font); |
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if (!ft_face) |
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{ |
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if (!ft_library) |
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{ |
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FT_Init_FreeType (&ft_library); |
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#ifdef HAVE_ATEXIT |
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atexit (free_ft_library); |
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#endif |
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} |
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unsigned int blob_length; |
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const char *blob_data = hb_blob_get_data (font_opts->blob, &blob_length); |
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if (FT_New_Memory_Face (ft_library, |
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(const FT_Byte *) blob_data, |
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blob_length, |
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font_opts->face_index, |
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&ft_face)) |
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fail (false, "FT_New_Memory_Face fail"); |
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} |
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if (!ft_face) |
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{ |
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/* This allows us to get some boxes at least... */ |
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cairo_face = cairo_toy_font_face_create ("@cairo:sans", |
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CAIRO_FONT_SLANT_NORMAL, |
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CAIRO_FONT_WEIGHT_NORMAL); |
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} |
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else |
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{ |
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ft_face->generic.data = hb_blob_reference (font_opts->blob); |
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ft_face->generic.finalizer = _release_blob; |
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#if !defined(HB_NO_VAR) && defined(HAVE_FT_SET_VAR_BLEND_COORDINATES) |
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unsigned int num_coords; |
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const float *coords = hb_font_get_var_coords_design (font_opts->font, &num_coords); |
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if (num_coords) |
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{ |
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FT_Fixed *ft_coords = (FT_Fixed *) calloc (num_coords, sizeof (FT_Fixed)); |
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if (ft_coords) |
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{ |
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for (unsigned int i = 0; i < num_coords; i++) |
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ft_coords[i] = coords[i] * 65536.f; |
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FT_Set_Var_Design_Coordinates (ft_face, num_coords, ft_coords); |
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free (ft_coords); |
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} |
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} |
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#endif |
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cairo_face = cairo_ft_font_face_create_for_ft_face (ft_face, font_opts->ft_load_flags); |
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} |
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return cairo_face; |
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} |
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static inline bool |
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helper_cairo_ft_scaled_font_has_color (cairo_scaled_font_t *scaled_font) |
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{ |
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bool ret = false; |
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#ifdef FT_HAS_COLOR |
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FT_Face ft_face = cairo_ft_scaled_font_lock_face (scaled_font); |
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if (ft_face) |
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{ |
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if (FT_HAS_COLOR (ft_face)) |
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ret = true; |
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cairo_ft_scaled_font_unlock_face (scaled_font); |
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} |
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#endif |
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return ret; |
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} |
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#endif
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