Edit
kc3-lang/harfbuzz/util/view-cairo.cc
Behdad Esfahbod
- util/view-cairo.cc
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/* * Copyright © 2011 Google, Inc. * * This is part of HarfBuzz, a text shaping library. * * Permission is hereby granted, without written agreement and without * license or royalty fees, to use, copy, modify, and distribute this * software and its documentation for any purpose, provided that the * above copyright notice and the following two paragraphs appear in * all copies of this software. * * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. * * Google Author(s): Behdad Esfahbod */ #include "view-cairo.hh" #include <assert.h> void view_cairo_t::render (const font_options_t *font_opts) { bool vertical = HB_DIRECTION_IS_VERTICAL (direction); int vert = vertical ? 1 : 0; int horiz = vertical ? 0 : 1; int x_sign = font_opts->font_size_x < 0 ? -1 : +1; int y_sign = font_opts->font_size_y < 0 ? -1 : +1; hb_font_t *font = font_opts->get_font(); view_options_t::font_extents_t extents = view_options.font_extents; if (!view_options.have_font_extents) { hb_font_extents_t hb_extents; hb_font_get_extents_for_direction (font, direction, &hb_extents); extents.ascent = scalbn ((double) hb_extents.ascender, scale_bits); extents.descent = -scalbn ((double) hb_extents.descender, scale_bits); extents.line_gap = scalbn ((double) hb_extents.line_gap, scale_bits); } double ascent = y_sign * extents.ascent; double descent = y_sign * extents.descent; double line_gap = y_sign * extents.line_gap + view_options.line_space; double leading = ascent + descent + line_gap; /* Calculate surface size. */ double w = 0, h = 0; (vertical ? w : h) = (int) lines->len * leading - (extents.line_gap + view_options.line_space); (vertical ? h : w) = 0; for (unsigned int i = 0; i < lines->len; i++) { helper_cairo_line_t &line = g_array_index (lines, helper_cairo_line_t, i); double x_advance, y_advance; line.get_advance (&x_advance, &y_advance); if (vertical) h = MAX (h, y_sign * y_advance); else w = MAX (w, x_sign * x_advance); } cairo_scaled_font_t *scaled_font = helper_cairo_create_scaled_font (font_opts); /* See if font needs color. */ cairo_content_t content = CAIRO_CONTENT_ALPHA; if (helper_cairo_scaled_font_has_color (scaled_font)) content = CAIRO_CONTENT_COLOR; /* Create surface. */ cairo_t *cr = helper_cairo_create_context (w + view_options.margin.l + view_options.margin.r, h + view_options.margin.t + view_options.margin.b, &view_options, &output_options, content); cairo_set_scaled_font (cr, scaled_font); /* Setup coordinate system. */ cairo_translate (cr, view_options.margin.l, view_options.margin.t); if (vertical) cairo_translate (cr, w - ascent, /* We currently always stack lines right to left */ y_sign < 0 ? h : 0); else { cairo_translate (cr, x_sign < 0 ? w : 0, y_sign < 0 ? descent : ascent); } /* Draw. */ cairo_translate (cr, +vert * leading, -horiz * leading); for (unsigned int i = 0; i < lines->len; i++) { helper_cairo_line_t &l = g_array_index (lines, helper_cairo_line_t, i); cairo_translate (cr, -vert * leading, +horiz * leading); if (view_options.annotate) { cairo_save (cr); /* Draw actual glyph origins */ cairo_set_source_rgba (cr, 1., 0., 0., .5); cairo_set_line_width (cr, 5); cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND); for (unsigned i = 0; i < l.num_glyphs; i++) { cairo_move_to (cr, l.glyphs[i].x, l.glyphs[i].y); cairo_rel_line_to (cr, 0, 0); } cairo_stroke (cr); cairo_restore (cr); } if (0 && cairo_surface_get_type (cairo_get_target (cr)) == CAIRO_SURFACE_TYPE_IMAGE) { /* cairo_show_glyphs() doesn't support subpixel positioning */ cairo_glyph_path (cr, l.glyphs, l.num_glyphs); cairo_fill (cr); } else if (l.num_clusters) cairo_show_text_glyphs (cr, l.utf8, l.utf8_len, l.glyphs, l.num_glyphs, l.clusters, l.num_clusters, l.cluster_flags); else cairo_show_glyphs (cr, l.glyphs, l.num_glyphs); } /* Clean up. */ helper_cairo_destroy_context (cr); cairo_scaled_font_destroy (scaled_font); }