HarfBuzz text shaping engine
http://harfbuzz.github.io/
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145 lines
4.2 KiB
145 lines
4.2 KiB
/* |
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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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