221 lines
6.8 KiB
C++
221 lines
6.8 KiB
C++
/*
|
|
* 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
|
|
*/
|
|
|
|
#ifndef VIEW_CAIRO_HH
|
|
#define VIEW_CAIRO_HH
|
|
|
|
#include "view-options.hh"
|
|
#include "output-options.hh"
|
|
#include "helper-cairo.hh"
|
|
|
|
struct view_cairo_t : view_options_t, output_options_t<>
|
|
{
|
|
~view_cairo_t ()
|
|
{
|
|
cairo_debug_reset_static_data ();
|
|
}
|
|
|
|
void add_options (option_parser_t *parser)
|
|
{
|
|
parser->set_summary ("View text with given font.");
|
|
view_options_t::add_options (parser);
|
|
output_options_t::add_options (parser, helper_cairo_supported_formats);
|
|
}
|
|
|
|
void init (hb_buffer_t *buffer, const font_options_t *font_opts)
|
|
{
|
|
lines = g_array_new (false, false, sizeof (helper_cairo_line_t));
|
|
subpixel_bits = font_opts->subpixel_bits;
|
|
}
|
|
void new_line () {}
|
|
void consume_text (hb_buffer_t *buffer,
|
|
const char *text,
|
|
unsigned int text_len,
|
|
hb_bool_t utf8_clusters) {}
|
|
void error (const char *message)
|
|
{ g_printerr ("%s: %s\n", g_get_prgname (), message); }
|
|
void consume_glyphs (hb_buffer_t *buffer,
|
|
const char *text,
|
|
unsigned int text_len,
|
|
hb_bool_t utf8_clusters)
|
|
{
|
|
direction = hb_buffer_get_direction (buffer);
|
|
helper_cairo_line_t l (text, text_len, buffer, utf8_clusters, subpixel_bits);
|
|
g_array_append_val (lines, l);
|
|
}
|
|
void finish (hb_buffer_t *buffer, const font_options_t *font_opts)
|
|
{
|
|
render (font_opts);
|
|
|
|
for (unsigned int i = 0; i < lines->len; i++) {
|
|
helper_cairo_line_t &line = g_array_index (lines, helper_cairo_line_t, i);
|
|
line.finish ();
|
|
}
|
|
#if GLIB_CHECK_VERSION (2, 22, 0)
|
|
g_array_unref (lines);
|
|
#else
|
|
g_array_free (lines, TRUE);
|
|
#endif
|
|
}
|
|
|
|
protected:
|
|
|
|
void render (const font_options_t *font_opts);
|
|
|
|
hb_direction_t direction = HB_DIRECTION_INVALID; // Remove this, make segment_properties accessible
|
|
GArray *lines = nullptr;
|
|
unsigned subpixel_bits = 0;
|
|
};
|
|
|
|
inline 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->font;
|
|
|
|
if (!have_font_extents)
|
|
{
|
|
hb_font_extents_t hb_extents;
|
|
hb_font_get_extents_for_direction (font, direction, &hb_extents);
|
|
font_extents.ascent = scalbn ((double) hb_extents.ascender, - (int) subpixel_bits);
|
|
font_extents.descent = -scalbn ((double) hb_extents.descender, - (int) subpixel_bits);
|
|
font_extents.line_gap = scalbn ((double) hb_extents.line_gap, - (int) subpixel_bits);
|
|
have_font_extents = true;
|
|
}
|
|
|
|
double ascent = y_sign * font_extents.ascent;
|
|
double descent = y_sign * font_extents.descent;
|
|
double line_gap = y_sign * font_extents.line_gap + line_space;
|
|
double leading = ascent + descent + line_gap;
|
|
|
|
/* Calculate surface size. */
|
|
double w = 0, h = 0;
|
|
(vertical ? w : h) = (int) lines->len * leading - (font_extents.line_gap + 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,
|
|
this);
|
|
|
|
/* 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 + margin.l + margin.r,
|
|
h + margin.t + margin.b,
|
|
this,
|
|
this,
|
|
content);
|
|
cairo_set_scaled_font (cr, scaled_font);
|
|
|
|
/* Setup coordinate system. */
|
|
cairo_translate (cr, margin.l, 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 (show_extents)
|
|
{
|
|
cairo_save (cr);
|
|
|
|
cairo_set_source_rgba (cr, 1., 0., 0., .5);
|
|
cairo_set_line_width (cr, 10);
|
|
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);
|
|
cairo_save (cr);
|
|
|
|
cairo_set_source_rgba (cr, 1., 0., 1., .5);
|
|
cairo_set_line_width (cr, 3);
|
|
for (unsigned i = 0; i < l.num_glyphs; i++)
|
|
{
|
|
hb_glyph_extents_t hb_extents;
|
|
hb_font_get_glyph_extents (font, l.glyphs[i].index, &hb_extents);
|
|
double x1 = scalbn ((double) hb_extents.x_bearing, - (int) subpixel_bits);
|
|
double y1 = -scalbn ((double) hb_extents.y_bearing, - (int) subpixel_bits);
|
|
double width = scalbn ((double) hb_extents.width, - (int) subpixel_bits);
|
|
double height = -scalbn ((double) hb_extents.height, - (int) subpixel_bits);
|
|
|
|
cairo_rectangle (cr, l.glyphs[i].x + x1, l.glyphs[i].y + y1, width, height);
|
|
}
|
|
cairo_stroke (cr);
|
|
|
|
cairo_restore (cr);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
#endif
|