HarfBuzz text shaping engine
http://harfbuzz.github.io/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
126 lines
4.1 KiB
126 lines
4.1 KiB
/* |
|
* 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" |
|
|
|
void |
|
view_cairo_t::get_surface_size (cairo_scaled_font_t *scaled_font, |
|
double *w, double *h) |
|
{ |
|
cairo_font_extents_t font_extents; |
|
|
|
cairo_scaled_font_extents (scaled_font, &font_extents); |
|
|
|
bool vertical = HB_DIRECTION_IS_VERTICAL (direction); |
|
(vertical ? *w : *h) = (int) lines->len * (font_extents.height + view_options.line_space) - 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_advance); |
|
else |
|
*w = MAX (*w, x_advance); |
|
} |
|
|
|
*w += view_options.margin.l + view_options.margin.r; |
|
*h += view_options.margin.t + view_options.margin.b; |
|
} |
|
|
|
void |
|
view_cairo_t::render (const font_options_t *font_opts) |
|
{ |
|
cairo_scaled_font_t *scaled_font = helper_cairo_create_scaled_font (font_opts, view_options.font_size); |
|
double w, h; |
|
get_surface_size (scaled_font, &w, &h); |
|
cairo_t *cr = helper_cairo_create_context (w, h, &view_options, &output_options); |
|
cairo_set_scaled_font (cr, scaled_font); |
|
cairo_scaled_font_destroy (scaled_font); |
|
|
|
draw (cr); |
|
|
|
helper_cairo_destroy_context (cr); |
|
} |
|
|
|
void |
|
view_cairo_t::draw (cairo_t *cr) |
|
{ |
|
cairo_save (cr); |
|
|
|
bool vertical = HB_DIRECTION_IS_VERTICAL (direction); |
|
int v = vertical ? 1 : 0; |
|
int h = vertical ? 0 : 1; |
|
cairo_font_extents_t font_extents; |
|
cairo_font_extents (cr, &font_extents); |
|
cairo_translate (cr, view_options.margin.l, view_options.margin.t); |
|
double descent; |
|
if (vertical) |
|
descent = font_extents.height * (lines->len + .5); |
|
else |
|
descent = font_extents.height - font_extents.ascent; |
|
cairo_translate (cr, v * descent, h * -descent); |
|
for (unsigned int i = 0; i < lines->len; i++) |
|
{ |
|
helper_cairo_line_t &l = g_array_index (lines, helper_cairo_line_t, i); |
|
|
|
if (i) |
|
cairo_translate (cr, v * -view_options.line_space, h * view_options.line_space); |
|
|
|
cairo_translate (cr, v * -font_extents.height, h * font_extents.height); |
|
|
|
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); |
|
} |
|
|
|
cairo_restore (cr); |
|
}
|
|
|