146 lines
4.2 KiB
C++
146 lines
4.2 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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#include "view-cairo.hh"
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void
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view_cairo_t::init (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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scale = double (font_size) / hb_face_get_upem (hb_font_get_face (font_opts->get_font ()));
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}
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void
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view_cairo_t::consume_line (hb_buffer_t *buffer,
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const char *text,
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unsigned int text_len)
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{
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helper_cairo_line_t l;
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helper_cairo_line_from_buffer (&l, buffer, text, text_len, scale);
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g_array_append_val (lines, l);
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}
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void
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view_cairo_t::finish (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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g_array_unref (lines);
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}
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void
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view_cairo_t::get_surface_size (cairo_scaled_font_t *scaled_font,
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double *w, double *h)
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{
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cairo_font_extents_t font_extents;
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cairo_scaled_font_extents (scaled_font, &font_extents);
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*h = font_extents.ascent
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+ font_extents.descent
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+ ((int) lines->len - 1) * (font_extents.height + line_space);
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*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 line_width = line.get_width ();
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*w = MAX (*w, line_width);
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}
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*w += margin.l + margin.r;
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*h += margin.t + margin.b;
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}
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void
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view_cairo_t::render (const font_options_t *font_opts)
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{
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cairo_scaled_font_t *scaled_font = helper_cairo_create_scaled_font (font_opts, font_size);
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double w, h;
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get_surface_size (scaled_font, &w, &h);
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cairo_t *cr = helper_cairo_create_context (w, h, this, this);
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cairo_set_scaled_font (cr, scaled_font);
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cairo_scaled_font_destroy (scaled_font);
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draw (cr);
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helper_cairo_destroy_context (cr);
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}
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void
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view_cairo_t::draw (cairo_t *cr)
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{
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cairo_save (cr);
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cairo_font_extents_t font_extents;
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cairo_font_extents (cr, &font_extents);
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cairo_translate (cr, margin.l, margin.t);
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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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if (i)
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cairo_translate (cr, 0, line_space);
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cairo_translate (cr, 0, font_extents.ascent);
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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 (cairo_surface_get_type (cairo_get_target (cr)) == CAIRO_SURFACE_TYPE_IMAGE) {
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/* cairo_show_glyphs() doesn't support subpixel positioning */
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cairo_glyph_path (cr, l.glyphs, l.num_glyphs);
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cairo_fill (cr);
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} else 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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cairo_translate (cr, 0, font_extents.height - font_extents.ascent);
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}
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cairo_restore (cr);
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}
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