143 lines
4.1 KiB
C++
143 lines
4.1 KiB
C++
/*
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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_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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