harfbuzz/src/hb-view.c

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/*
* Copyright (C) 2010 Behdad Esfahbod
* Copyright (C) 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
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <unistd.h>
#include <getopt.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <glib.h>
#include <hb-glib.h>
#include <cairo-ft.h>
#include <hb-ft.h>
/* Controlled by cmd-line options */
static int margin_t = 10;
static int margin_b = 10;
static int margin_l = 10;
static int margin_r = 10;
static int line_space = 0;
static double font_size = 18;
static const char *fore = "#000000";
static const char *back = "#ffffff";
static const char *text = NULL;
static const char *font_file = NULL;
static const char *out_file = "/dev/stdout";
static const char *language = NULL;
static const char *script = NULL;
/* Ugh, global vars. Ugly, but does the job */
static int width = 0;
static int height = 0;
static cairo_surface_t *surface = NULL;
static cairo_pattern_t *fore_pattern = NULL;
static cairo_pattern_t *back_pattern = NULL;
static FT_Library ft_library;
static FT_Face ft_face;
static cairo_font_face_t *cairo_face;
G_GNUC_NORETURN static void
usage (FILE *f, int status)
{
fprintf (f, "usage: hb-view [OPTS...] font-file text\n");
exit (status);
}
G_GNUC_NORETURN static void
version (void)
{
printf ("hb-view (harfbuzz) %s\n", PACKAGE_VERSION);
exit (0);
}
static void
parse_opts (int argc, char **argv)
{
argv[0] = (char *) "hb-view";
while (1)
{
int option_index = 0, c;
static struct option long_options[] = {
{"help", 0, 0, 'h'},
{"version", 0, 0, 'v'},
{"margin", 1, 0, 'm'},
{"line-space", 1, 0, 'l'},
{"font-size", 1, 0, 's'},
{"foreground", 1, 0, 'F'},
{"background", 1, 0, 'B'},
{"language", 1, 0, 'L'},
{"script", 1, 0, 'S'},
{"output", 1, 0, 'o'},
{0, 0, 0, 0}
};
c = getopt_long (argc, argv, "", long_options, &option_index);
if (c == -1)
break;
switch (c)
{
case 0:
break;
case 'h':
usage (stdout, 0);
break;
case 'v':
version ();
break;
case 'l':
line_space = atoi (optarg);
break;
case 'm':
switch (sscanf (optarg, "%d %d %d %d", &margin_t, &margin_r, &margin_b, &margin_l)) {
case 1: margin_r = margin_t;
case 2: margin_b = margin_t;
case 3: margin_l = margin_r;
}
break;
case 's':
font_size = strtod (optarg, NULL);
break;
case 'f':
font_file = optarg;
break;
case 'F':
fore = optarg;
break;
case 'B':
back = optarg;
break;
case 't':
text = optarg;
break;
case 'L':
language = optarg;
break;
case 'S':
script = optarg;
break;
case 'o':
out_file = optarg;
break;
case '?':
usage (stdout, 1);
break;
default:
break;
}
}
if (optind + 2 != argc)
usage (stderr, 1);
font_file = argv[optind++];
text = argv[optind++];
}
static cairo_glyph_t *
_hb_cr_text_glyphs (cairo_t *cr,
const char *text, int len,
unsigned int *pnum_glyphs)
{
cairo_scaled_font_t *scaled_font = cairo_get_scaled_font (cr);
FT_Face ft_face = cairo_ft_scaled_font_lock_face (scaled_font);
hb_face_t *hb_face = hb_ft_face_create (ft_face, NULL);
hb_font_t *hb_font = hb_ft_font_create (ft_face, NULL);
hb_buffer_t *hb_buffer;
cairo_glyph_t *cairo_glyphs;
hb_glyph_info_t *hb_glyph;
hb_glyph_position_t *hb_position;
unsigned int num_glyphs, i;
hb_position_t x;
if (len < 0)
len = strlen (text);
hb_buffer = hb_buffer_create (len);
hb_buffer_set_unicode_funcs (hb_buffer, hb_glib_get_unicode_funcs ());
hb_buffer_add_utf8 (hb_buffer, text, len, 0, len);
if (script)
hb_buffer_set_script (hb_buffer, hb_script_from_iso15924_tag (hb_tag_from_string (script)));
else
hb_buffer_set_script (hb_buffer, HB_SCRIPT_INVALID);
hb_buffer_set_direction (hb_buffer, HB_DIRECTION_INVALID);
hb_buffer_set_language (hb_buffer, hb_language_from_string (language));
hb_shape (hb_font, hb_face, hb_buffer, NULL, 0);
num_glyphs = hb_buffer_get_length (hb_buffer);
hb_glyph = hb_buffer_get_glyph_infos (hb_buffer);
hb_position = hb_buffer_get_glyph_positions (hb_buffer);
cairo_glyphs = cairo_glyph_allocate (num_glyphs + 1);
x = 0;
for (i = 0; i < num_glyphs; i++)
{
cairo_glyphs[i].index = hb_glyph->codepoint;
cairo_glyphs[i].x = (hb_position->x_offset + x) * (1./64);
cairo_glyphs[i].y = -(hb_position->y_offset) * (1./64);
x += hb_position->x_advance;
hb_glyph++;
hb_position++;
}
cairo_glyphs[i].x = x * (1./64);
hb_buffer_destroy (hb_buffer);
hb_font_destroy (hb_font);
hb_face_destroy (hb_face);
cairo_ft_scaled_font_unlock_face (scaled_font);
if (pnum_glyphs)
*pnum_glyphs = num_glyphs;
return cairo_glyphs;
}
static cairo_t *
create_context (void)
{
cairo_t *cr;
unsigned int fr, fg, fb, fa, br, bg, bb, ba;
if (surface)
cairo_surface_destroy (surface);
if (back_pattern)
cairo_pattern_destroy (back_pattern);
if (fore_pattern)
cairo_pattern_destroy (fore_pattern);
br = bg = bb = ba = 255;
sscanf (back + (*back=='#'), "%2x%2x%2x%2x", &br, &bg, &bb, &ba);
fr = fg = fb = 0; fa = 255;
sscanf (fore + (*fore=='#'), "%2x%2x%2x%2x", &fr, &fg, &fb, &fa);
if (ba == 255 && fa == 255 && br == bg && bg == bb && fr == fg && fg == fb) {
/* grayscale. use A8 surface */
surface = cairo_image_surface_create (CAIRO_FORMAT_A8, width, height);
cr = cairo_create (surface);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_rgba (cr, 1., 1., 1., br / 255.);
cairo_paint (cr);
back_pattern = cairo_pattern_reference (cairo_get_source (cr));
cairo_set_source_rgba (cr, 1., 1., 1., fr / 255.);
fore_pattern = cairo_pattern_reference (cairo_get_source (cr));
} else {
/* color. use (A)RGB surface */
if (ba != 255)
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
else
surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, width, height);
cr = cairo_create (surface);
cairo_set_source_rgba (cr, br / 255., bg / 255., bb / 255., ba / 255.);
cairo_paint (cr);
back_pattern = cairo_pattern_reference (cairo_get_source (cr));
cairo_set_source_rgba (cr, fr / 255., fg / 255., fb / 255., fa / 255.);
fore_pattern = cairo_pattern_reference (cairo_get_source (cr));
}
cairo_set_font_face (cr, cairo_face);
return cr;
}
static void
draw (void)
{
cairo_t *cr;
cairo_font_extents_t font_extents;
cairo_glyph_t *glyphs = NULL;
unsigned int num_glyphs = 0;
const char *end, *p = text;
double x, y;
cr= create_context ();
cairo_set_font_size (cr, font_size);
cairo_font_extents (cr, &font_extents);
height = 0;
width = 0;
x = margin_l;
y = margin_t;
do {
cairo_text_extents_t extents;
end = strchr (p, '\n');
if (!end)
end = p + strlen (p);
if (p != text)
y += line_space;
if (p != end) {
glyphs = _hb_cr_text_glyphs (cr, p, end - p, &num_glyphs);
cairo_glyph_extents (cr, glyphs, num_glyphs, &extents);
y += ceil (font_extents.ascent);
width = MAX (width, extents.x_advance);
cairo_save (cr);
cairo_translate (cr, x, y);
cairo_show_glyphs (cr, glyphs, num_glyphs);
cairo_restore (cr);
y += ceil (font_extents.height - ceil (font_extents.ascent));
cairo_glyph_free (glyphs);
}
p = end + 1;
} while (*end);
height = y + margin_b;
width += margin_l + margin_r;
cairo_destroy (cr);
}
int
main (int argc, char **argv)
{
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cairo_status_t status;
parse_opts (argc, argv);
FT_Init_FreeType (&ft_library);
if (FT_New_Face (ft_library, font_file, 0, &ft_face)) {
fprintf (stderr, "Failed to open font file `%s'\n", font_file);
exit (1);
}
cairo_face = cairo_ft_font_face_create_for_ft_face (ft_face, 0);
draw ();
draw ();
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status = cairo_surface_write_to_png (surface, out_file);
if (status != CAIRO_STATUS_SUCCESS) {
fprintf (stderr, "Failed to write output file `%s': %s\n",
out_file, cairo_status_to_string (status));
exit (1);
}
return 0;
}