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https://github.com/love2d/megasource.git
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add harfbuzz library
This commit is contained in:
Sasha Szpakowski
@@ -0,0 +1,316 @@
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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_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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#include "hb-blob.hh"
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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,
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(double) to_x, (double) 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,
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(double) to_x, (double) 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,
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(double) control1_x, (double) control1_y,
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(double) control2_x, (double) control2_y,
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(double) to_x, (double) 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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#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
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#ifdef CAIRO_HAS_PNG_FUNCTIONS
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static inline cairo_status_t
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_hb_bytes_read_func (hb_bytes_t *src,
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char *data,
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unsigned length)
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{
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if (unlikely (src->length < length))
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return CAIRO_STATUS_READ_ERROR;
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memcpy (data, src->arrayZ, length);
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*src += length;
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return CAIRO_STATUS_SUCCESS;
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}
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static cairo_status_t
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render_color_glyph_png (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_blob_t *blob = hb_ot_color_glyph_reference_png (font, glyph);
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if (blob == hb_blob_get_empty ())
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return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
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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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/* Draw PNG. */
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hb_bytes_t bytes = blob->as_bytes ();
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cairo_surface_t *surface = cairo_image_surface_create_from_png_stream ((cairo_read_func_t) _hb_bytes_read_func,
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std::addressof (bytes));
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hb_blob_destroy (blob);
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if (unlikely (cairo_surface_status (surface)) != CAIRO_STATUS_SUCCESS)
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{
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cairo_surface_destroy (surface);
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return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
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}
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int width = cairo_image_surface_get_width (surface);
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int height = cairo_image_surface_get_width (surface);
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hb_glyph_extents_t hb_extents;
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if (unlikely (!hb_font_get_glyph_extents (font, glyph, &hb_extents)))
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{
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cairo_surface_destroy (surface);
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return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
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}
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cairo_pattern_t *pattern = cairo_pattern_create_for_surface (surface);
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cairo_pattern_set_extend (pattern, CAIRO_EXTEND_PAD);
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cairo_matrix_t matrix = {(double) width, 0, 0, (double) height, 0, 0};
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cairo_pattern_set_matrix (pattern, &matrix);
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cairo_translate (cr, hb_extents.x_bearing, hb_extents.y_bearing);
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cairo_scale (cr, hb_extents.width, hb_extents.height);
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cairo_set_source (cr, pattern);
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cairo_rectangle (cr, 0, 0, 1, 1);
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cairo_fill (cr);
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cairo_pattern_destroy (pattern);
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cairo_surface_destroy (surface);
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return CAIRO_STATUS_SUCCESS;
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}
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#endif
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static cairo_status_t
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render_color_glyph_layers (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_face_t *face = hb_font_get_face (font);
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unsigned count = hb_ot_color_glyph_get_layers (face, glyph, 0, nullptr, nullptr);
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if (!count)
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return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
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hb_ot_color_layer_t layers[16];
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unsigned offset = 0, len;
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do {
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len = ARRAY_LENGTH (layers);
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hb_ot_color_glyph_get_layers (face, glyph,
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offset,
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&len,
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layers);
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for (unsigned i = 0; i < len; i++)
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{
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hb_color_t color;
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unsigned clen = 1;
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unsigned color_index = layers[i].color_index;
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bool is_foreground = color_index == 65535;
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if (!is_foreground)
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{
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hb_ot_color_palette_get_colors (face,
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0/*palette_index*/,
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color_index/*start_offset*/,
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&clen/*color_count*/,
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&color);
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if (clen < 1)
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continue;
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}
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cairo_save (cr);
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{
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if (!is_foreground)
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cairo_set_source_rgba (cr,
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hb_color_get_red (color) / 255.,
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hb_color_get_green (color) / 255.,
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hb_color_get_blue (color) / 255.,
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hb_color_get_alpha (color) / 255.);
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cairo_status_t ret = render_glyph (scaled_font, layers[i].glyph, cr, extents);
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if (ret != CAIRO_STATUS_SUCCESS)
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return ret;
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}
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cairo_restore (cr);
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}
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}
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while (len == ARRAY_LENGTH (layers));
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return CAIRO_STATUS_SUCCESS;
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}
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static cairo_status_t
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render_color_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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cairo_status_t ret = CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
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#ifdef CAIRO_HAS_PNG_FUNCTIONS
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ret = render_color_glyph_png (scaled_font, glyph, cr, extents);
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if (ret != CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED)
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return ret;
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#endif
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ret = render_color_glyph_layers (scaled_font, glyph, cr, extents);
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if (ret != CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED)
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return ret;
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return render_glyph (scaled_font, glyph, cr, extents);
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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_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_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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cairo_user_font_face_set_render_glyph_func (cairo_face, render_glyph);
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#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
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hb_face_t *face = hb_font_get_face (font_opts->font);
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if (hb_ot_color_has_png (face) || hb_ot_color_has_layers (face))
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cairo_user_font_face_set_render_color_glyph_func (cairo_face, render_color_glyph);
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#endif
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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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hb_face_t *face = hb_font_get_face (font);
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return hb_ot_color_has_png (face) || hb_ot_color_has_layers (face);
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}
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#endif
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