walkero
/
harfbuzz
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
harfbuzz/util/hb-view.cc

610 lines
15 KiB
C++
Raw Blame History

/*
* Copyright © 2010 Behdad Esfahbod
* 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
*/
#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 <locale.h>
#include <glib.h>
#include <glib/gprintf.h>
#include <cairo-ft.h>
#include <hb-ft.h>
/* Controlled by cmd-line options */
struct margin_t {
double t, r, b, l;
};
static margin_t opt_margin = {18, 18, 18, 18};
static char **opt_shapers;
static double line_space = 0;
static int face_index = 0;
static double font_size = 36;
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 *direction = NULL;
static const char *script = NULL;
static const char *language = NULL;
static hb_bool_t annotate = FALSE;
static hb_bool_t debug = FALSE;
static hb_feature_t *features = NULL;
static unsigned int num_features;
/* 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 cairo_font_face_t *cairo_face;
static gchar *
shapers_to_string (void)
{
GString *shapers = g_string_new (NULL);
const char **shaper_list = hb_shape_list_shapers ();
for (; *shaper_list; shaper_list++) {
g_string_append (shapers, *shaper_list);
g_string_append_c (shapers, ',');
}
g_string_truncate (shapers, MAX (0, (gint)shapers->len - 1));
return g_string_free (shapers, FALSE);
}
static G_GNUC_NORETURN gboolean
show_version (const char *name G_GNUC_UNUSED,
const char *arg G_GNUC_UNUSED,
gpointer data G_GNUC_UNUSED,
GError **error G_GNUC_UNUSED)
{
g_printf ("%s (%s) %s\n", g_get_prgname (), PACKAGE_NAME, PACKAGE_VERSION);
char *shapers = shapers_to_string ();
g_printf ("Available shapers: %s\n", shapers);
g_free (shapers);
if (strcmp (HB_VERSION_STRING, hb_version_string ()))
g_printf ("Linked HarfBuzz library has a different version: %s\n", hb_version_string ());
exit(0);
}
static gboolean
parse_features (const char *name G_GNUC_UNUSED,
const char *arg,
gpointer data G_GNUC_UNUSED,
GError **error G_GNUC_UNUSED);
static gboolean
parse_margin (const char *name G_GNUC_UNUSED,
const char *arg,
gpointer data G_GNUC_UNUSED,
GError **error G_GNUC_UNUSED)
{
switch (sscanf (arg, "%f %f %f %f", &opt_margin.t, &opt_margin.r, &opt_margin.b, &opt_margin.l)) {
case 1: opt_margin.r = opt_margin.t;
case 2: opt_margin.b = opt_margin.t;
case 3: opt_margin.l = opt_margin.r;
case 4: return TRUE;
default:
g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
"%s argument should be one to four space-separated numbers",
name);
return FALSE;
}
}
static gboolean
parse_shapers (const char *name G_GNUC_UNUSED,
const char *arg,
gpointer data G_GNUC_UNUSED,
GError **error G_GNUC_UNUSED)
{
opt_shapers = g_strsplit (arg, ",", 0);
return TRUE;
}
void
fail (const char *format, ...)
{
const char *msg;
va_list vap;
va_start (vap, format);
msg = g_strdup_vprintf (format, vap);
g_printerr ("%s: %s\n", g_get_prgname (), msg);
exit (1);
}
void
parse_options (int argc, char *argv[])
{
GOptionEntry entries[] =
{
{"version", 0, G_OPTION_FLAG_NO_ARG,
G_OPTION_ARG_CALLBACK, (gpointer) &show_version, "Show version numbers", NULL},
{"debug", 0, 0, G_OPTION_ARG_NONE, &debug, "Free all resources before exit", NULL},
{"output", 0, 0, G_OPTION_ARG_STRING, &out_file, "Set output file name", "filename"},
{"annotate", 0, 0, G_OPTION_ARG_NONE, &annotate, "Annotate output rendering", NULL},
{"background", 0, 0, G_OPTION_ARG_STRING, &back, "Set background color", "red/#rrggbb/#rrggbbaa"},
{"foreground", 0, 0, G_OPTION_ARG_STRING, &fore, "Set foreground color", "red/#rrggbb/#rrggbbaa"},
{"line-space", 0, 0, G_OPTION_ARG_DOUBLE, &font_size, "Set space between lines (default: 0)", "units"},
{"margin", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_margin, "Margin around output", "one to four numbers"},
{"shapers", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_shapers, "Comma-separated list of shapers", "list"},
{"direction", 0, 0, G_OPTION_ARG_STRING, &direction, "Set text direction (default: auto)", "ltr/rtl/ttb/btt"},
{"language", 0, 0, G_OPTION_ARG_STRING, &language, "Set text language (default: $LANG)", "langstr"},
{"script", 0, 0, G_OPTION_ARG_STRING, &script, "Set text script (default: auto)", "ISO-15924 tag"},
{"features", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_features, "Font features to apply to text", "TODO"},
{"face-index", 0, 0, G_OPTION_ARG_INT, &face_index, "Face index (default: 0)", "index"},
{"font-size", 0, 0, G_OPTION_ARG_DOUBLE, &font_size, "Font size", "size"},
{NULL}
};
GError *error = NULL;
GError *parse_error = NULL;
GOptionContext *context;
size_t len;
context = g_option_context_new ("- FONT-FILE TEXT");
g_option_context_add_main_entries (context, entries, NULL);
if (!g_option_context_parse (context, &argc, &argv, &parse_error))
{
if (parse_error != NULL)
fail ("%s", parse_error->message);
else
fail ("Option parse error");
exit(1);
}
g_option_context_free(context);
if (argc != 3) {
g_printerr ("Usage: %s [OPTION...] FONT-FILE TEXT\n", g_get_prgname ());
exit (1);
}
font_file = argv[1];
text = argv[2];
}
static void
parse_space (char **pp)
{
char c;
#define ISSPACE(c) ((c)==' '||(c)=='\f'||(c)=='\n'||(c)=='\r'||(c)=='\t'||(c)=='\v')
while (c = **pp, ISSPACE (c))
(*pp)++;
#undef ISSPACE
}
static hb_bool_t
parse_char (char **pp, char c)
{
parse_space (pp);
if (**pp != c)
return FALSE;
(*pp)++;
return TRUE;
}
static hb_bool_t
parse_uint (char **pp, unsigned int *pv)
{
char *p = *pp;
unsigned int v;
v = strtol (p, pp, 0);
if (p == *pp)
return FALSE;
*pv = v;
return TRUE;
}
static hb_bool_t
parse_feature_value_prefix (char **pp, hb_feature_t *feature)
{
if (parse_char (pp, '-'))
feature->value = 0;
else {
parse_char (pp, '+');
feature->value = 1;
}
return TRUE;
}
static hb_bool_t
parse_feature_tag (char **pp, hb_feature_t *feature)
{
char *p = *pp, c;
parse_space (pp);
#define ISALNUM(c) (('a' <= (c) && (c) <= 'z') || ('A' <= (c) && (c) <= 'Z') || ('0' <= (c) && (c) <= '9'))
while (c = **pp, ISALNUM(c))
(*pp)++;
#undef ISALNUM
if (p == *pp)
return FALSE;
**pp = '\0';
feature->tag = hb_tag_from_string (p);
**pp = c;
return TRUE;
}
static hb_bool_t
parse_feature_indices (char **pp, hb_feature_t *feature)
{
hb_bool_t has_start;
feature->start = 0;
feature->end = (unsigned int) -1;
if (!parse_char (pp, '['))
return TRUE;
has_start = parse_uint (pp, &feature->start);
if (parse_char (pp, ':')) {
parse_uint (pp, &feature->end);
} else {
if (has_start)
feature->end = feature->start + 1;
}
return parse_char (pp, ']');
}
static hb_bool_t
parse_feature_value_postfix (char **pp, hb_feature_t *feature)
{
return !parse_char (pp, '=') || parse_uint (pp, &feature->value);
}
static hb_bool_t
parse_one_feature (char **pp, hb_feature_t *feature)
{
return parse_feature_value_prefix (pp, feature) &&
parse_feature_tag (pp, feature) &&
parse_feature_indices (pp, feature) &&
parse_feature_value_postfix (pp, feature) &&
(parse_char (pp, ',') || **pp == '\0');
}
static void
skip_one_feature (char **pp)
{
char *e;
e = strchr (*pp, ',');
if (e)
*pp = e + 1;
else
*pp = *pp + strlen (*pp);
}
static gboolean
parse_features (const char *name G_GNUC_UNUSED,
const char *arg,
gpointer data G_GNUC_UNUSED,
GError **error G_GNUC_UNUSED)
{
char *s = (char *) arg;
char *p;
num_features = 0;
features = NULL;
if (!*s)
return TRUE;
/* count the features first, so we can allocate memory */
p = s;
do {
num_features++;
p = strchr (p, ',');
if (p)
p++;
} while (p);
features = (hb_feature_t *) calloc (num_features, sizeof (*features));
/* now do the actual parsing */
p = s;
num_features = 0;
while (*p) {
if (parse_one_feature (&p, &features[num_features]))
num_features++;
else
skip_one_feature (&p);
}
return TRUE;
}
static cairo_glyph_t *
_hb_cr_text_glyphs (cairo_t *cr,
const char *utf8, 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_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, y;
hb_buffer = hb_buffer_create (0);
if (direction)
hb_buffer_set_direction (hb_buffer, hb_direction_from_string (direction));
if (script)
hb_buffer_set_script (hb_buffer, hb_script_from_string (script));
if (language)
hb_buffer_set_language (hb_buffer, hb_language_from_string (language));
if (len < 0)
len = strlen (utf8);
hb_buffer_add_utf8 (hb_buffer, utf8, len, 0, len);
if (!hb_shape_full (hb_font, hb_buffer, features, num_features, NULL, opt_shapers))
fail ("All shapers failed");
num_glyphs = hb_buffer_get_length (hb_buffer);
hb_glyph = hb_buffer_get_glyph_infos (hb_buffer, NULL);
hb_position = hb_buffer_get_glyph_positions (hb_buffer, NULL);
cairo_glyphs = cairo_glyph_allocate (num_glyphs);
x = 0;
y = 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 + y) * (1./64);
x += hb_position->x_advance;
y += -hb_position->y_advance;
hb_glyph++;
hb_position++;
}
hb_buffer_destroy (hb_buffer);
hb_font_destroy (hb_font);
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 (!annotate && 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 = opt_margin.l;
y = opt_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);
if (annotate) {
unsigned int i;
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 (i = 0; i < num_glyphs; i++) {
cairo_move_to (cr, glyphs[i].x, glyphs[i].y);
cairo_rel_line_to (cr, 0, 0);
}
cairo_stroke (cr);
cairo_restore (cr);
}
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 + opt_margin.b;
width += opt_margin.l + opt_margin.r;
cairo_destroy (cr);
}
int
main (int argc, char **argv)
{
static FT_Library ft_library;
static FT_Face ft_face;
cairo_status_t status;
setlocale (LC_ALL, "");
parse_options (argc, argv);
FT_Init_FreeType (&ft_library);
if (FT_New_Face (ft_library, font_file, face_index, &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 ();
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);
}
if (debug) {
free (features);
g_free (opt_shapers);
cairo_pattern_destroy (fore_pattern);
cairo_pattern_destroy (back_pattern);
cairo_surface_destroy (surface);
cairo_font_face_destroy (cairo_face);
cairo_debug_reset_static_data ();
FT_Done_Face (ft_face);
FT_Done_FreeType (ft_library);
}
return 0;
}
Reference in New Issue View Git Blame Copy Permalink