421 lines
12 KiB
C++
421 lines
12 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 "config.h"
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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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#include "hb-cairo-utils.h"
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static const cairo_user_data_key_t _hb_font_cairo_user_data_key = {0};
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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 (void)
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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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#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
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static void
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push_transform (hb_paint_funcs_t *funcs,
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void *paint_data,
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float xx, float yx,
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float xy, float yy,
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float dx, float dy,
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void *user_data)
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{
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cairo_t *cr = (cairo_t *)paint_data;
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cairo_matrix_t m;
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cairo_save (cr);
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cairo_matrix_init (&m, (double)xx, (double)yx,
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(double)xy, (double)yy,
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(double)dx, (double)dy);
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cairo_transform (cr, &m);
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}
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static void
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pop_transform (hb_paint_funcs_t *funcs,
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void *paint_data,
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void *user_data)
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{
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cairo_t *cr = (cairo_t *)paint_data;
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cairo_restore (cr);
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}
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static void
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push_clip_glyph (hb_paint_funcs_t *funcs,
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void *paint_data,
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hb_codepoint_t glyph,
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hb_font_t *font,
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void *user_data)
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{
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cairo_t *cr = (cairo_t *)paint_data;
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cairo_save (cr);
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cairo_new_path (cr);
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hb_font_draw_glyph (font, glyph, get_cairo_draw_funcs (), cr);
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cairo_close_path (cr);
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cairo_clip (cr);
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}
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static void
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push_clip_rectangle (hb_paint_funcs_t *funcs,
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void *paint_data,
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float xmin, float ymin, float xmax, float ymax,
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void *user_data)
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{
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cairo_t *cr = (cairo_t *)paint_data;
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cairo_save (cr);
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cairo_rectangle (cr,
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(double)xmin, (double)ymin,
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(double)(xmax - xmin), (double)(ymax - ymin));
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cairo_clip (cr);
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}
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static void
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pop_clip (hb_paint_funcs_t *funcs,
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void *paint_data,
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void *user_data)
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{
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cairo_t *cr = (cairo_t *)paint_data;
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cairo_restore (cr);
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}
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static void
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push_group (hb_paint_funcs_t *funcs,
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void *paint_data,
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void *user_data)
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{
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cairo_t *cr = (cairo_t *)paint_data;
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cairo_save (cr);
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cairo_push_group (cr);
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}
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static void
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pop_group (hb_paint_funcs_t *funcs,
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void *paint_data,
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hb_paint_composite_mode_t mode,
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void *user_data)
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{
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cairo_t *cr = (cairo_t *)paint_data;
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cairo_pop_group_to_source (cr);
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cairo_set_operator (cr, hb_paint_composite_mode_to_cairo (mode));
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cairo_paint (cr);
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cairo_restore (cr);
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}
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static void
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paint_color (hb_paint_funcs_t *funcs,
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void *paint_data,
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hb_bool_t use_foreground,
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hb_color_t color,
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void *user_data)
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{
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cairo_t *cr = (cairo_t *)paint_data;
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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_paint (cr);
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}
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static void
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paint_image (hb_paint_funcs_t *funcs,
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void *paint_data,
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hb_blob_t *blob,
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hb_tag_t format,
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float slant,
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hb_glyph_extents_t *extents,
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void *user_data)
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{
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cairo_t *cr = (cairo_t *)paint_data;
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hb_cairo_paint_glyph_image (cr, blob, format, slant, extents);
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}
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static void
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paint_linear_gradient (hb_paint_funcs_t *funcs,
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void *paint_data,
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hb_color_line_t *color_line,
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float x0, float y0,
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float x1, float y1,
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float x2, float y2,
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void *user_data)
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{
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cairo_t *cr = (cairo_t *)paint_data;
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hb_cairo_paint_linear_gradient (cr, color_line, x0, y0, x1, y1, x2, y2);
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}
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static void
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paint_radial_gradient (hb_paint_funcs_t *funcs,
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void *paint_data,
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hb_color_line_t *color_line,
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float x0, float y0, float r0,
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float x1, float y1, float r1,
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void *user_data)
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{
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cairo_t *cr = (cairo_t *)paint_data;
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hb_cairo_paint_radial_gradient (cr, color_line, x0, y0, r0, x1, y1, r1);
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}
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static void
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paint_sweep_gradient (hb_paint_funcs_t *funcs,
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void *paint_data,
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hb_color_line_t *color_line,
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float x0, float y0,
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float start_angle, float end_angle,
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void *user_data)
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{
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cairo_t *cr = (cairo_t *)paint_data;
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hb_cairo_paint_sweep_gradient (cr, color_line, x0, y0, start_angle, end_angle);
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}
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static hb_paint_funcs_t *
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get_cairo_paint_funcs ()
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{
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static hb_paint_funcs_t *funcs;
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if (!funcs)
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{
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funcs = hb_paint_funcs_create ();
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hb_paint_funcs_set_push_transform_func (funcs, push_transform, nullptr, nullptr);
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hb_paint_funcs_set_pop_transform_func (funcs, pop_transform, nullptr, nullptr);
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hb_paint_funcs_set_push_clip_glyph_func (funcs, push_clip_glyph, nullptr, nullptr);
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hb_paint_funcs_set_push_clip_rectangle_func (funcs, push_clip_rectangle, nullptr, nullptr);
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hb_paint_funcs_set_pop_clip_func (funcs, pop_clip, nullptr, nullptr);
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hb_paint_funcs_set_push_group_func (funcs, push_group, nullptr, nullptr);
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hb_paint_funcs_set_pop_group_func (funcs, pop_group, nullptr, nullptr);
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hb_paint_funcs_set_color_func (funcs, paint_color, nullptr, nullptr);
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hb_paint_funcs_set_image_func (funcs, paint_image, nullptr, nullptr);
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hb_paint_funcs_set_linear_gradient_func (funcs, paint_linear_gradient, nullptr, nullptr);
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hb_paint_funcs_set_radial_gradient_func (funcs, paint_radial_gradient, nullptr, nullptr);
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hb_paint_funcs_set_sweep_gradient_func (funcs, paint_sweep_gradient, nullptr, nullptr);
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}
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return funcs;
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}
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#endif
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#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
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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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#endif
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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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#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
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static char *p = getenv ("HB_DRAW");
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if (p && atoi (p) >= 2)
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return render_color_glyph (scaled_font, glyph, cr, extents);
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#endif
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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_draw_glyph (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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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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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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unsigned int palette = 0;
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#ifdef CAIRO_COLOR_PALETTE_DEFAULT
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cairo_font_options_t *options = cairo_font_options_create ();
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cairo_scaled_font_get_font_options (scaled_font, options);
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palette = cairo_font_options_get_color_palette (options);
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cairo_font_options_destroy (options);
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#endif
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hb_color_t color = HB_COLOR (0, 0, 0, 255);
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cairo_pattern_t *pattern = cairo_get_source (cr);
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if (cairo_pattern_get_type (pattern) == CAIRO_PATTERN_TYPE_SOLID)
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{
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double r, g, b, a;
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cairo_pattern_get_rgba (pattern, &r, &g, &b, &a);
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color = HB_COLOR ((int)(b * 255.), (int)(g * 255.), (int) (r * 255.), (int)(a * 255.));
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}
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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_paint_glyph (font, glyph, get_cairo_paint_funcs (), cr, palette, color);
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hb_glyph_extents_t hb_extents;
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hb_font_get_glyph_extents (font, glyph, &hb_extents);
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extents->x_bearing = (double) hb_extents.x_bearing / x_scale;
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extents->y_bearing = (double)-hb_extents.y_bearing / y_scale;
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extents->width = (double) hb_extents.width / x_scale;
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extents->height = (double)-hb_extents.height / y_scale;
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return CAIRO_STATUS_SUCCESS;
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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) || hb_ot_color_has_paint (face))
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{
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cairo_user_font_face_set_render_color_glyph_func (cairo_face, render_color_glyph);
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}
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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) || hb_ot_color_has_paint (face);
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}
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#endif
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