523 lines
15 KiB
C++
523 lines
15 KiB
C++
/*
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* Copyright © 2022 Red Hat, 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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* Red Hat Author(s): Matthias Clasen
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*/
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#include "hb.hh"
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#include "hb-cairo.h"
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#include "hb-cairo-utils.hh"
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#include "hb-utf.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, (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, (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, NULL, NULL);
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hb_draw_funcs_set_line_to_func (funcs, (hb_draw_line_to_func_t) line_to, NULL, NULL);
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hb_draw_funcs_set_cubic_to_func (funcs, (hb_draw_cubic_to_func_t) cubic_to, NULL, NULL);
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hb_draw_funcs_set_close_path_func (funcs, (hb_draw_close_path_func_t) close_path, NULL, NULL);
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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 hb_bool_t
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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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unsigned width,
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unsigned height,
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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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return hb_cairo_paint_glyph_image (cr, blob, width, height, 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, NULL, NULL);
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hb_paint_funcs_set_pop_transform_func (funcs, pop_transform, NULL, NULL);
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hb_paint_funcs_set_push_clip_glyph_func (funcs, push_clip_glyph, NULL, NULL);
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hb_paint_funcs_set_push_clip_rectangle_func (funcs, push_clip_rectangle, NULL, NULL);
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hb_paint_funcs_set_pop_clip_func (funcs, pop_clip, NULL, NULL);
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hb_paint_funcs_set_push_group_func (funcs, push_group, NULL, NULL);
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hb_paint_funcs_set_pop_group_func (funcs, pop_group, NULL, NULL);
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hb_paint_funcs_set_color_func (funcs, paint_color, NULL, NULL);
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hb_paint_funcs_set_image_func (funcs, paint_image, NULL, NULL);
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hb_paint_funcs_set_linear_gradient_func (funcs, paint_linear_gradient, NULL, NULL);
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hb_paint_funcs_set_radial_gradient_func (funcs, paint_radial_gradient, NULL, NULL);
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hb_paint_funcs_set_sweep_gradient_func (funcs, paint_sweep_gradient, NULL, NULL);
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}
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return funcs;
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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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#endif
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static const cairo_user_data_key_t hb_cairo_font_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;
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hb_position_t x_scale, y_scale;
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font = (hb_font_t *) cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
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&hb_cairo_font_user_data_key);
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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;
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unsigned int palette = 0;
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cairo_font_options_t *options;
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hb_color_t color;
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hb_position_t x_scale, y_scale;
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font = (hb_font_t *) cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
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&hb_cairo_font_user_data_key);
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#ifdef CAIRO_COLOR_PALETTE_DEFAULT
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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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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_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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return CAIRO_STATUS_SUCCESS;
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}
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#endif
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static cairo_font_face_t *
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user_font_face_create (hb_font_t *font)
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{
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cairo_font_face_t *cairo_face;
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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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#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
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hb_face_t *face = hb_font_get_face (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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cairo_user_font_face_set_render_color_glyph_func (cairo_face, render_color_glyph);
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#endif
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cairo_font_face_set_user_data (cairo_face,
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&hb_cairo_font_user_data_key,
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(void *) hb_font_reference (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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cairo_font_face_t *
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hb_cairo_font_face_create (hb_font_t *font)
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{
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hb_font_make_immutable (font);
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return user_font_face_create (font);
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}
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hb_font_t *
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hb_cairo_font_face_get_font (cairo_font_face_t *font_face)
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{
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return (hb_font_t *) cairo_font_face_get_user_data (font_face, &hb_cairo_font_user_data_key);
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}
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void
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hb_cairo_glyphs_from_buffer (hb_buffer_t *buffer,
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const char *text,
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int text_len,
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hb_bool_t utf8_clusters,
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int scale_factor,
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cairo_glyph_t **glyphs,
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unsigned int *num_glyphs,
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cairo_text_cluster_t **clusters,
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unsigned int *num_clusters,
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cairo_text_cluster_flags_t *cluster_flags)
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{
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if (text && text_len < 0)
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text_len = strlen (text);
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*num_glyphs = hb_buffer_get_length (buffer);
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hb_glyph_info_t *hb_glyph = hb_buffer_get_glyph_infos (buffer, nullptr);
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hb_glyph_position_t *hb_position = hb_buffer_get_glyph_positions (buffer, nullptr);
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*glyphs = cairo_glyph_allocate (*num_glyphs + 1);
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if (text)
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{
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*num_clusters = *num_glyphs ? 1 : 0;
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for (unsigned int i = 1; i < *num_glyphs; i++)
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if (hb_glyph[i].cluster != hb_glyph[i-1].cluster)
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(*num_clusters)++;
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*clusters = cairo_text_cluster_allocate (*num_clusters);
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}
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else if (clusters)
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{
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*clusters = nullptr;
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*num_clusters = 0;
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*cluster_flags = (cairo_text_cluster_flags_t) 0;
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}
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if ((*num_glyphs && !*glyphs) ||
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(clusters && *num_clusters && !*clusters))
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{
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if (*glyphs)
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{
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cairo_glyph_free (*glyphs);
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*glyphs = nullptr;
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*num_glyphs = 0;
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}
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if (clusters && *clusters)
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{
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cairo_text_cluster_free (*clusters);
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*clusters = nullptr;
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*num_clusters = 0;
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*cluster_flags = (cairo_text_cluster_flags_t) 0;
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}
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return;
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}
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double iscale = scale_factor ? 1. / scale_factor : 0.;
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hb_position_t x = 0, y = 0;
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int i;
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for (i = 0; i < (int) *num_glyphs; i++)
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{
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(*glyphs)[i].index = hb_glyph[i].codepoint;
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(*glyphs)[i].x = (+hb_position->x_offset + x) * iscale;
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(*glyphs)[i].y = (-hb_position->y_offset + y) * iscale;
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x += hb_position->x_advance;
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y += -hb_position->y_advance;
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hb_position++;
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}
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(*glyphs)[i].index = -1;
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(*glyphs)[i].x = x * iscale;
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(*glyphs)[i].y = y * iscale;
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if (*num_clusters)
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{
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memset ((void *) *clusters, 0, *num_clusters * sizeof ((*clusters)[0]));
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hb_bool_t backward = HB_DIRECTION_IS_BACKWARD (hb_buffer_get_direction (buffer));
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*cluster_flags = backward ? CAIRO_TEXT_CLUSTER_FLAG_BACKWARD : (cairo_text_cluster_flags_t) 0;
|
|
unsigned int cluster = 0;
|
|
const char *start = text, *end;
|
|
(*clusters)[cluster].num_glyphs++;
|
|
if (backward)
|
|
{
|
|
for (i = *num_glyphs - 2; i >= 0; i--)
|
|
{
|
|
if (hb_glyph[i].cluster != hb_glyph[i+1].cluster)
|
|
{
|
|
assert (hb_glyph[i].cluster > hb_glyph[i+1].cluster);
|
|
if (utf8_clusters)
|
|
end = start + hb_glyph[i].cluster - hb_glyph[i+1].cluster;
|
|
else
|
|
end = (const char *) hb_utf_offset_to_pointer<hb_utf8_t> ((const uint8_t *) start,
|
|
(signed) (hb_glyph[i].cluster - hb_glyph[i+1].cluster));
|
|
(*clusters)[cluster].num_bytes = end - start;
|
|
start = end;
|
|
cluster++;
|
|
}
|
|
(*clusters)[cluster].num_glyphs++;
|
|
}
|
|
(*clusters)[cluster].num_bytes = text + text_len - start;
|
|
}
|
|
else
|
|
{
|
|
for (i = 1; i < (int) *num_glyphs; i++)
|
|
{
|
|
if (hb_glyph[i].cluster != hb_glyph[i-1].cluster)
|
|
{
|
|
assert (hb_glyph[i].cluster > hb_glyph[i-1].cluster);
|
|
if (utf8_clusters)
|
|
end = start + hb_glyph[i].cluster - hb_glyph[i-1].cluster;
|
|
else
|
|
end = (const char *) hb_utf_offset_to_pointer<hb_utf8_t> ((const uint8_t *) start,
|
|
(signed) (hb_glyph[i].cluster - hb_glyph[i-1].cluster));
|
|
(*clusters)[cluster].num_bytes = end - start;
|
|
start = end;
|
|
cluster++;
|
|
}
|
|
(*clusters)[cluster].num_glyphs++;
|
|
}
|
|
(*clusters)[cluster].num_bytes = text + text_len - start;
|
|
}
|
|
}
|
|
}
|