229 lines
6.6 KiB
C++
229 lines
6.6 KiB
C++
/*
|
|
* Copyright © 2022 Google, Inc.
|
|
*
|
|
* 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.
|
|
*
|
|
* Google Author(s): Behdad Esfahbod
|
|
*/
|
|
|
|
#ifndef HELPER_CAIRO_USER_HH
|
|
#define HELPER_CAIRO_USER_HH
|
|
|
|
#include "font-options.hh"
|
|
|
|
#include <cairo.h>
|
|
#include <hb.h>
|
|
|
|
#include "hb-blob.hh"
|
|
|
|
static void
|
|
move_to (hb_draw_funcs_t *dfuncs,
|
|
cairo_t *cr,
|
|
hb_draw_state_t *st,
|
|
float to_x, float to_y,
|
|
void *)
|
|
{
|
|
cairo_move_to (cr, to_x, to_y);
|
|
}
|
|
|
|
static void
|
|
line_to (hb_draw_funcs_t *dfuncs,
|
|
cairo_t *cr,
|
|
hb_draw_state_t *st,
|
|
float to_x, float to_y,
|
|
void *)
|
|
{
|
|
cairo_line_to (cr, to_x, to_y);
|
|
}
|
|
|
|
static void
|
|
cubic_to (hb_draw_funcs_t *dfuncs,
|
|
cairo_t *cr,
|
|
hb_draw_state_t *st,
|
|
float control1_x, float control1_y,
|
|
float control2_x, float control2_y,
|
|
float to_x, float to_y,
|
|
void *)
|
|
{
|
|
cairo_curve_to (cr, control1_x, control1_y, control2_x, control2_y, to_x, to_y);
|
|
}
|
|
|
|
static void
|
|
close_path (hb_draw_funcs_t *dfuncs,
|
|
cairo_t *cr,
|
|
hb_draw_state_t *st,
|
|
void *)
|
|
{
|
|
cairo_close_path (cr);
|
|
}
|
|
|
|
|
|
static hb_draw_funcs_t *
|
|
get_cairo_draw_funcs ()
|
|
{
|
|
static hb_draw_funcs_t *funcs;
|
|
|
|
if (!funcs)
|
|
{
|
|
funcs = hb_draw_funcs_create ();
|
|
hb_draw_funcs_set_move_to_func (funcs, (hb_draw_move_to_func_t) move_to, nullptr, nullptr);
|
|
hb_draw_funcs_set_line_to_func (funcs, (hb_draw_line_to_func_t) line_to, nullptr, nullptr);
|
|
hb_draw_funcs_set_cubic_to_func (funcs, (hb_draw_cubic_to_func_t) cubic_to, nullptr, nullptr);
|
|
hb_draw_funcs_set_close_path_func (funcs, (hb_draw_close_path_func_t) close_path, nullptr, nullptr);
|
|
}
|
|
|
|
return funcs;
|
|
}
|
|
|
|
static const cairo_user_data_key_t _hb_font_cairo_user_data_key = {0};
|
|
|
|
static cairo_status_t
|
|
render_glyph (cairo_scaled_font_t *scaled_font,
|
|
unsigned long glyph,
|
|
cairo_t *cr,
|
|
cairo_text_extents_t *extents)
|
|
{
|
|
hb_font_t *font = (hb_font_t *) (cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
|
|
&_hb_font_cairo_user_data_key));
|
|
|
|
hb_position_t x_scale, y_scale;
|
|
hb_font_get_scale (font, &x_scale, &y_scale);
|
|
cairo_scale (cr, +1./x_scale, -1./y_scale);
|
|
|
|
hb_font_get_glyph_shape (font, glyph, get_cairo_draw_funcs (), cr);
|
|
cairo_fill (cr);
|
|
|
|
return CAIRO_STATUS_SUCCESS;
|
|
}
|
|
|
|
#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
|
|
|
|
static cairo_status_t
|
|
_hb_bytes_read_func (hb_bytes_t *src,
|
|
char *data,
|
|
unsigned length)
|
|
{
|
|
if (unlikely (src->length < length))
|
|
return CAIRO_STATUS_READ_ERROR;
|
|
|
|
memcpy (data, src->arrayZ, length);
|
|
*src += length;
|
|
|
|
return CAIRO_STATUS_SUCCESS;
|
|
}
|
|
|
|
static cairo_status_t
|
|
render_color_glyph (cairo_scaled_font_t *scaled_font,
|
|
unsigned long glyph,
|
|
cairo_t *cr,
|
|
cairo_text_extents_t *extents)
|
|
{
|
|
hb_font_t *font = (hb_font_t *) (cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
|
|
&_hb_font_cairo_user_data_key));
|
|
|
|
hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, glyph);
|
|
if (blob == hb_blob_get_empty ())
|
|
return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
|
|
|
|
hb_position_t x_scale, y_scale;
|
|
hb_font_get_scale (font, &x_scale, &y_scale);
|
|
cairo_scale (cr, +1./x_scale, -1./y_scale);
|
|
|
|
#ifdef CAIRO_HAS_PNG_FUNCTIONS
|
|
/* Draw PNG. */
|
|
hb_bytes_t bytes = blob->as_bytes ();
|
|
cairo_surface_t *surface = cairo_image_surface_create_from_png_stream ((cairo_read_func_t) _hb_bytes_read_func,
|
|
std::addressof (bytes));
|
|
hb_blob_destroy (blob);
|
|
|
|
if (unlikely (cairo_surface_status (surface)) != CAIRO_STATUS_SUCCESS)
|
|
{
|
|
cairo_surface_destroy (surface);
|
|
return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
int width = cairo_image_surface_get_width (surface);
|
|
int height = cairo_image_surface_get_width (surface);
|
|
|
|
hb_glyph_extents_t hb_extents;
|
|
if (unlikely (!hb_font_get_glyph_extents (font, glyph, &hb_extents)))
|
|
{
|
|
cairo_surface_destroy (surface);
|
|
return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
cairo_pattern_t *pattern = cairo_pattern_create_for_surface (surface);
|
|
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_PAD);
|
|
|
|
cairo_matrix_t matrix = {(double) width, 0, 0, (double) height, 0, 0};
|
|
cairo_pattern_set_matrix (pattern, &matrix);
|
|
|
|
cairo_translate (cr, hb_extents.x_bearing, hb_extents.y_bearing);
|
|
cairo_scale (cr, hb_extents.width, hb_extents.height);
|
|
cairo_set_source (cr, pattern);
|
|
|
|
cairo_rectangle (cr, 0, 0, 1, 1);
|
|
cairo_fill (cr);
|
|
cairo_pattern_destroy (pattern);
|
|
|
|
cairo_surface_destroy (surface);
|
|
return CAIRO_STATUS_SUCCESS;
|
|
#endif
|
|
return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
|
|
}
|
|
#endif
|
|
|
|
static inline cairo_font_face_t *
|
|
helper_cairo_create_user_font_face (const font_options_t *font_opts)
|
|
{
|
|
cairo_font_face_t *cairo_face = cairo_user_font_face_create ();
|
|
|
|
cairo_font_face_set_user_data (cairo_face,
|
|
&_hb_font_cairo_user_data_key,
|
|
hb_font_reference (font_opts->font),
|
|
(cairo_destroy_func_t) hb_font_destroy);
|
|
|
|
cairo_user_font_face_set_render_glyph_func (cairo_face, render_glyph);
|
|
#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
|
|
if (hb_ot_color_has_png (hb_font_get_face (font_opts->font)))
|
|
cairo_user_font_face_set_render_color_glyph_func (cairo_face, render_color_glyph);
|
|
#endif
|
|
|
|
return cairo_face;
|
|
}
|
|
|
|
static inline bool
|
|
helper_cairo_user_font_face_has_data (cairo_font_face_t *font_face)
|
|
{
|
|
return cairo_font_face_get_user_data (font_face, &_hb_font_cairo_user_data_key);
|
|
}
|
|
|
|
static inline bool
|
|
helper_cairo_user_scaled_font_has_color (cairo_scaled_font_t *scaled_font)
|
|
{
|
|
/* Ignoring SVG for now, since we cannot render it. */
|
|
hb_font_t *font = (hb_font_t *) (cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
|
|
&_hb_font_cairo_user_data_key));
|
|
return hb_ot_color_has_png (hb_font_get_face (font));
|
|
}
|
|
|
|
#endif
|