202 lines
6.1 KiB
C++
202 lines
6.1 KiB
C++
/*
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* Copyright © 2011 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 VIEW_CAIRO_HH
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#define VIEW_CAIRO_HH
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#include "view-options.hh"
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#include "output-options.hh"
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#include "helper-cairo.hh"
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struct view_cairo_t : view_options_t, output_options_t<>
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{
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~view_cairo_t ()
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{
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cairo_debug_reset_static_data ();
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}
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void add_options (option_parser_t *parser)
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{
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parser->set_summary ("View text with given font.");
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view_options_t::add_options (parser);
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output_options_t::add_options (parser, helper_cairo_supported_formats);
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}
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void init (hb_buffer_t *buffer, const font_options_t *font_opts)
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{
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lines = g_array_new (false, false, sizeof (helper_cairo_line_t));
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subpixel_bits = font_opts->subpixel_bits;
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}
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void new_line () {}
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void consume_text (hb_buffer_t *buffer,
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const char *text,
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unsigned int text_len,
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hb_bool_t utf8_clusters) {}
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void error (const char *message)
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{ g_printerr ("%s: %s\n", g_get_prgname (), message); }
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void consume_glyphs (hb_buffer_t *buffer,
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const char *text,
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unsigned int text_len,
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hb_bool_t utf8_clusters)
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{
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direction = hb_buffer_get_direction (buffer);
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helper_cairo_line_t l (text, text_len, buffer, utf8_clusters, subpixel_bits);
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g_array_append_val (lines, l);
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}
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void finish (hb_buffer_t *buffer, const font_options_t *font_opts)
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{
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render (font_opts);
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for (unsigned int i = 0; i < lines->len; i++) {
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helper_cairo_line_t &line = g_array_index (lines, helper_cairo_line_t, i);
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line.finish ();
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}
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#if GLIB_CHECK_VERSION (2, 22, 0)
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g_array_unref (lines);
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#else
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g_array_free (lines, TRUE);
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#endif
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}
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protected:
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void render (const font_options_t *font_opts);
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hb_direction_t direction = HB_DIRECTION_INVALID; // Remove this, make segment_properties accessible
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GArray *lines = nullptr;
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unsigned subpixel_bits = 0;
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};
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inline void
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view_cairo_t::render (const font_options_t *font_opts)
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{
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bool vertical = HB_DIRECTION_IS_VERTICAL (direction);
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int vert = vertical ? 1 : 0;
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int horiz = vertical ? 0 : 1;
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int x_sign = font_opts->font_size_x < 0 ? -1 : +1;
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int y_sign = font_opts->font_size_y < 0 ? -1 : +1;
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hb_font_t *font = font_opts->font;
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if (!have_font_extents)
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{
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hb_font_extents_t hb_extents;
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hb_font_get_extents_for_direction (font, direction, &hb_extents);
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font_extents.ascent = scalbn ((double) hb_extents.ascender, - (int) subpixel_bits);
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font_extents.descent = -scalbn ((double) hb_extents.descender, - (int) subpixel_bits);
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font_extents.line_gap = scalbn ((double) hb_extents.line_gap, - (int) subpixel_bits);
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have_font_extents = true;
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}
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double ascent = y_sign * font_extents.ascent;
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double descent = y_sign * font_extents.descent;
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double line_gap = y_sign * font_extents.line_gap + line_space;
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double leading = ascent + descent + line_gap;
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/* Calculate surface size. */
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double w = 0, h = 0;
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(vertical ? w : h) = (int) lines->len * leading - (font_extents.line_gap + line_space);
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(vertical ? h : w) = 0;
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for (unsigned int i = 0; i < lines->len; i++) {
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helper_cairo_line_t &line = g_array_index (lines, helper_cairo_line_t, i);
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double x_advance, y_advance;
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line.get_advance (&x_advance, &y_advance);
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if (vertical)
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h = MAX (h, y_sign * y_advance);
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else
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w = MAX (w, x_sign * x_advance);
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}
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cairo_scaled_font_t *scaled_font = helper_cairo_create_scaled_font (font_opts);
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/* See if font needs color. */
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cairo_content_t content = CAIRO_CONTENT_ALPHA;
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if (helper_cairo_scaled_font_has_color (scaled_font))
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content = CAIRO_CONTENT_COLOR;
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/* Create surface. */
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cairo_t *cr = helper_cairo_create_context (w + margin.l + margin.r,
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h + margin.t + margin.b,
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this,
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this,
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content);
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cairo_set_scaled_font (cr, scaled_font);
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/* Setup coordinate system. */
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cairo_translate (cr, margin.l, margin.t);
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if (vertical)
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cairo_translate (cr,
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w - ascent, /* We currently always stack lines right to left */
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y_sign < 0 ? h : 0);
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else
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{
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cairo_translate (cr,
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x_sign < 0 ? w : 0,
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y_sign < 0 ? descent : ascent);
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}
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/* Draw. */
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cairo_translate (cr, +vert * leading, -horiz * leading);
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for (unsigned int i = 0; i < lines->len; i++)
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{
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helper_cairo_line_t &l = g_array_index (lines, helper_cairo_line_t, i);
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cairo_translate (cr, -vert * leading, +horiz * leading);
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if (annotate) {
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cairo_save (cr);
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/* Draw actual glyph origins */
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cairo_set_source_rgba (cr, 1., 0., 0., .5);
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cairo_set_line_width (cr, 5);
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cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
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for (unsigned i = 0; i < l.num_glyphs; i++) {
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cairo_move_to (cr, l.glyphs[i].x, l.glyphs[i].y);
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cairo_rel_line_to (cr, 0, 0);
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}
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cairo_stroke (cr);
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cairo_restore (cr);
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}
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if (l.num_clusters)
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cairo_show_text_glyphs (cr,
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l.utf8, l.utf8_len,
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l.glyphs, l.num_glyphs,
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l.clusters, l.num_clusters,
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l.cluster_flags);
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else
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cairo_show_glyphs (cr, l.glyphs, l.num_glyphs);
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}
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/* Clean up. */
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helper_cairo_destroy_context (cr);
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cairo_scaled_font_destroy (scaled_font);
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}
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#endif
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