Is automatically enabled if cairo is recent enough, and font-funcs are not 'ft'. Uses cairo-user-font backend internally.pull/3411/head
Behdad Esfahbod
3 years ago
parent
a357e5d889
commit
5d2df1208a
4 changed files with 279 additions and 71 deletions
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/*
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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 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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#ifdef HAVE_FT_SET_VAR_BLEND_COORDINATES |
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unsigned int num_coords; |
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const int *coords = hb_font_get_var_coords_normalized (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] << 2; |
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FT_Set_Var_Blend_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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@ -0,0 +1,142 @@ |
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/*
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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 |
||||
* software and its documentation for any purpose, provided that the |
||||
* 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_USER_HH |
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#define HELPER_CAIRO_USER_HH |
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#include "font-options.hh" |
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#include <cairo.h> |
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#include <hb.h> |
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static void |
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move_to (hb_draw_funcs_t *dfuncs, |
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cairo_t *cr, |
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hb_draw_state_t *st, |
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float to_x, float to_y, |
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void *) |
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{ |
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cairo_move_to (cr, to_x, to_y); |
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} |
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static void |
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line_to (hb_draw_funcs_t *dfuncs, |
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cairo_t *cr, |
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hb_draw_state_t *st, |
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float to_x, float to_y, |
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void *) |
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{ |
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cairo_line_to (cr, to_x, to_y); |
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} |
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static void |
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cubic_to (hb_draw_funcs_t *dfuncs, |
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cairo_t *cr, |
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hb_draw_state_t *st, |
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float control1_x, float control1_y, |
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float control2_x, float control2_y, |
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float to_x, float to_y, |
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void *) |
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{ |
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cairo_curve_to (cr, control1_x, control1_y, control2_x, control2_y, to_x, to_y); |
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} |
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static void |
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close_path (hb_draw_funcs_t *dfuncs, |
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cairo_t *cr, |
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hb_draw_state_t *st, |
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void *) |
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{ |
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cairo_close_path (cr); |
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} |
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static hb_draw_funcs_t * |
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get_cairo_draw_funcs () |
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{ |
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static hb_draw_funcs_t *funcs; |
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if (!funcs) |
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{ |
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funcs = hb_draw_funcs_create (); |
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hb_draw_funcs_set_move_to_func (funcs, (hb_draw_move_to_func_t) move_to, nullptr, nullptr); |
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hb_draw_funcs_set_line_to_func (funcs, (hb_draw_line_to_func_t) line_to, nullptr, nullptr); |
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hb_draw_funcs_set_cubic_to_func (funcs, (hb_draw_cubic_to_func_t) cubic_to, nullptr, nullptr); |
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hb_draw_funcs_set_close_path_func (funcs, (hb_draw_close_path_func_t) close_path, nullptr, nullptr); |
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} |
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return funcs; |
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} |
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static const cairo_user_data_key_t _hb_font_cairo_user_data_key = {0}; |
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static cairo_status_t |
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render_glyph (cairo_scaled_font_t *scaled_font, |
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unsigned long glyph, |
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cairo_t *cr, |
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cairo_text_extents_t *extents) |
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{ |
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hb_font_t *font = (hb_font_t *) (cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font), |
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&_hb_font_cairo_user_data_key)); |
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hb_position_t x_scale, y_scale; |
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hb_font_get_scale (font, &x_scale, &y_scale); |
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cairo_scale (cr, +1./x_scale, -1./y_scale); |
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hb_font_get_glyph_shape (font, glyph, get_cairo_draw_funcs (), cr); |
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cairo_fill (cr); |
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return CAIRO_STATUS_SUCCESS; |
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} |
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static inline cairo_font_face_t * |
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helper_cairo_create_user_font_face (const font_options_t *font_opts) |
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{ |
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cairo_font_face_t *cairo_face = cairo_user_font_face_create (); |
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cairo_user_font_face_set_render_glyph_func (cairo_face, render_glyph); |
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cairo_font_face_set_user_data (cairo_face, |
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&_hb_font_cairo_user_data_key, |
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hb_font_reference (font_opts->font), |
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(cairo_destroy_func_t) hb_font_destroy); |
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return cairo_face; |
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} |
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static inline bool |
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helper_cairo_user_font_face_has_data (cairo_font_face_t *font_face) |
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{ |
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return cairo_font_face_get_user_data (font_face, &_hb_font_cairo_user_data_key); |
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} |
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static inline bool |
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helper_cairo_user_scaled_font_has_color (cairo_scaled_font_t *scaled_font) |
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{ |
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/* Ignoring SVG for now, since we cannot render it. */ |
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hb_font_t *font = (hb_font_t *) (cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font), |
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&_hb_font_cairo_user_data_key)); |
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return hb_ot_color_has_png (hb_font_get_face (font)); |
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} |
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#endif |
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