1 /* 2 * Copyright 2011 Google, Inc. 3 * 4 * This is part of HarfBuzz, a text shaping library. 5 * 6 * Permission is hereby granted, without written agreement and without 7 * license or royalty fees, to use, copy, modify, and distribute this 8 * software and its documentation for any purpose, provided that the 9 * above copyright notice and the following two paragraphs appear in 10 * all copies of this software. 11 * 12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 16 * DAMAGE. 17 * 18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 23 * 24 * Google Author(s): Behdad Esfahbod 25 */ 26 27 #include "view-cairo.hh" 28 29 void 30 view_cairo_t::get_surface_size (cairo_scaled_font_t *scaled_font, 31 double *w, double *h) 32 { 33 cairo_font_extents_t font_extents; 34 35 cairo_scaled_font_extents (scaled_font, &font_extents); 36 37 bool vertical = HB_DIRECTION_IS_VERTICAL (direction); 38 (vertical ? *w : *h) = (int) lines->len * (font_extents.height + view_options.line_space) - view_options.line_space; 39 (vertical ? *h : *w) = 0; 40 for (unsigned int i = 0; i < lines->len; i++) { 41 helper_cairo_line_t &line = g_array_index (lines, helper_cairo_line_t, i); 42 double x_advance, y_advance; 43 line.get_advance (&x_advance, &y_advance); 44 if (vertical) 45 *h = MAX (*h, y_advance); 46 else 47 *w = MAX (*w, x_advance); 48 } 49 50 *w += view_options.margin.l + view_options.margin.r; 51 *h += view_options.margin.t + view_options.margin.b; 52 } 53 54 void 55 view_cairo_t::render (const font_options_t *font_opts) 56 { 57 cairo_scaled_font_t *scaled_font = helper_cairo_create_scaled_font (font_opts, view_options.font_size); 58 double w, h; 59 get_surface_size (scaled_font, &w, &h); 60 cairo_t *cr = helper_cairo_create_context (w, h, &view_options, &output_options); 61 cairo_set_scaled_font (cr, scaled_font); 62 cairo_scaled_font_destroy (scaled_font); 63 64 draw (cr); 65 66 helper_cairo_destroy_context (cr); 67 } 68 69 void 70 view_cairo_t::draw (cairo_t *cr) 71 { 72 cairo_save (cr); 73 74 bool vertical = HB_DIRECTION_IS_VERTICAL (direction); 75 int v = vertical ? 1 : 0; 76 int h = vertical ? 0 : 1; 77 cairo_font_extents_t font_extents; 78 cairo_font_extents (cr, &font_extents); 79 cairo_translate (cr, view_options.margin.l, view_options.margin.t); 80 double descent; 81 if (vertical) 82 descent = font_extents.height * (lines->len + .5); 83 else 84 descent = font_extents.height - font_extents.ascent; 85 cairo_translate (cr, v * descent, h * -descent); 86 for (unsigned int i = 0; i < lines->len; i++) 87 { 88 helper_cairo_line_t &l = g_array_index (lines, helper_cairo_line_t, i); 89 90 if (i) 91 cairo_translate (cr, v * -view_options.line_space, h * view_options.line_space); 92 93 cairo_translate (cr, v * -font_extents.height, h * font_extents.height); 94 95 if (view_options.annotate) { 96 cairo_save (cr); 97 98 /* Draw actual glyph origins */ 99 cairo_set_source_rgba (cr, 1., 0., 0., .5); 100 cairo_set_line_width (cr, 5); 101 cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND); 102 for (unsigned i = 0; i < l.num_glyphs; i++) { 103 cairo_move_to (cr, l.glyphs[i].x, l.glyphs[i].y); 104 cairo_rel_line_to (cr, 0, 0); 105 } 106 cairo_stroke (cr); 107 108 cairo_restore (cr); 109 } 110 111 if (0 && cairo_surface_get_type (cairo_get_target (cr)) == CAIRO_SURFACE_TYPE_IMAGE) { 112 /* cairo_show_glyphs() doesn't support subpixel positioning */ 113 cairo_glyph_path (cr, l.glyphs, l.num_glyphs); 114 cairo_fill (cr); 115 } else if (l.num_clusters) 116 cairo_show_text_glyphs (cr, 117 l.utf8, l.utf8_len, 118 l.glyphs, l.num_glyphs, 119 l.clusters, l.num_clusters, 120 l.cluster_flags); 121 else 122 cairo_show_glyphs (cr, l.glyphs, l.num_glyphs); 123 } 124 125 cairo_restore (cr); 126 } 127
