[util] Move shape options into shape-options.hh
This commit is contained in:
Behdad Esfahbod
parent
cfb2d6ad9e
commit
c3599fded7
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@ -7,6 +7,7 @@ HB_VIEW_sources = \
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options.cc \
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options.hh \
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shape-consumer.hh \
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shape-options.hh \
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view-cairo.hh \
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view-options.hh \
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$(NULL)
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@ -17,6 +18,7 @@ HB_SHAPE_sources = \
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options.cc \
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options.hh \
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shape-consumer.hh \
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shape-options.hh \
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$(NULL)
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HB_OT_SHAPE_CLOSURE_sources = \
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@ -24,6 +24,7 @@
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* Google Author(s): Behdad Esfahbod
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*/
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#include "shape-options.hh"
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#include "main-font-text.hh"
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const unsigned DEFAULT_FONT_SIZE = FONT_SIZE_NONE;
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@ -27,7 +27,6 @@
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#ifndef HB_MAIN_FONT_TEXT_HH
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#define HB_MAIN_FONT_TEXT_HH
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#include "hb.hh"
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#include "options.hh"
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/* main() body for utilities taking font and processing text.*/
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179
util/options.cc
179
util/options.cc
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@ -31,8 +31,6 @@
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#endif
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#include <hb-ot.h>
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#define DELIMITERS "<+>{},;&#\\xXuUnNiI\n\t\v\f\r "
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static struct supported_font_funcs_t {
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char name[4];
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void (*func) (hb_font_t *);
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@ -127,100 +125,6 @@ option_parser_t::parse (int *argc, char ***argv)
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}
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static gboolean
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parse_shapers (const char *name G_GNUC_UNUSED,
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const char *arg,
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gpointer data,
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GError **error)
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{
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shape_options_t *shape_opts = (shape_options_t *) data;
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char **shapers = g_strsplit (arg, ",", 0);
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for (char **shaper = shapers; *shaper; shaper++) {
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bool found = false;
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for (const char **hb_shaper = hb_shape_list_shapers (); *hb_shaper; hb_shaper++) {
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if (strcmp (*shaper, *hb_shaper) == 0) {
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found = true;
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break;
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}
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}
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if (!found) {
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g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
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"Unknown or unsupported shaper: %s", *shaper);
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g_strfreev (shapers);
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return false;
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}
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}
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g_strfreev (shape_opts->shapers);
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shape_opts->shapers = shapers;
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return true;
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}
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static G_GNUC_NORETURN gboolean
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list_shapers (const char *name G_GNUC_UNUSED,
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const char *arg G_GNUC_UNUSED,
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gpointer data G_GNUC_UNUSED,
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GError **error G_GNUC_UNUSED)
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{
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for (const char **shaper = hb_shape_list_shapers (); *shaper; shaper++)
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g_printf ("%s\n", *shaper);
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exit(0);
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}
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static gboolean
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parse_features (const char *name G_GNUC_UNUSED,
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const char *arg,
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gpointer data,
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GError **error G_GNUC_UNUSED)
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{
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shape_options_t *shape_opts = (shape_options_t *) data;
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char *s = (char *) arg;
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size_t l = strlen (s);
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char *p;
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shape_opts->num_features = 0;
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g_free (shape_opts->features);
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shape_opts->features = nullptr;
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/* if the string is quoted, strip the quotes */
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if (s[0] == s[l - 1] && (s[0] == '\"' || s[0] == '\''))
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{
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s[l - 1] = '\0';
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s++;
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}
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if (!*s)
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return true;
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/* count the features first, so we can allocate memory */
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p = s;
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do {
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shape_opts->num_features++;
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p = strchr (p, ',');
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if (p)
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p++;
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} while (p);
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shape_opts->features = (hb_feature_t *) calloc (shape_opts->num_features, sizeof (*shape_opts->features));
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if (!shape_opts->features)
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return false;
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/* now do the actual parsing */
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p = s;
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shape_opts->num_features = 0;
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while (p && *p) {
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char *end = strchr (p, ',');
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if (hb_feature_from_string (p, end ? end - p : -1, &shape_opts->features[shape_opts->num_features]))
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shape_opts->num_features++;
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p = end ? end + 1 : nullptr;
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}
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return true;
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}
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static gboolean
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parse_variations (const char *name G_GNUC_UNUSED,
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const char *arg,
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@ -313,6 +217,8 @@ parse_unicodes (const char *name G_GNUC_UNUSED,
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while (s && *s)
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{
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#define DELIMITERS "<+>{},;&#\\xXuUnNiI\n\t\v\f\r "
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while (*s && strchr (DELIMITERS, *s))
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s++;
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if (!*s)
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@ -339,87 +245,6 @@ parse_unicodes (const char *name G_GNUC_UNUSED,
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return true;
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}
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void
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shape_options_t::add_options (option_parser_t *parser)
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{
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GOptionEntry entries[] =
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{
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{"list-shapers", 0, G_OPTION_FLAG_NO_ARG,
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G_OPTION_ARG_CALLBACK, (gpointer) &list_shapers, "List available shapers and quit", nullptr},
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{"shaper", 0, G_OPTION_FLAG_HIDDEN,
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G_OPTION_ARG_CALLBACK, (gpointer) &parse_shapers, "Hidden duplicate of --shapers", nullptr},
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{"shapers", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_shapers, "Set comma-separated list of shapers to try","list"},
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{"direction", 0, 0, G_OPTION_ARG_STRING, &this->direction, "Set text direction (default: auto)", "ltr/rtl/ttb/btt"},
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{"language", 0, 0, G_OPTION_ARG_STRING, &this->language, "Set text language (default: $LANG)", "langstr"},
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{"script", 0, 0, G_OPTION_ARG_STRING, &this->script, "Set text script (default: auto)", "ISO-15924 tag"},
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{"bot", 0, 0, G_OPTION_ARG_NONE, &this->bot, "Treat text as beginning-of-paragraph", nullptr},
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{"eot", 0, 0, G_OPTION_ARG_NONE, &this->eot, "Treat text as end-of-paragraph", nullptr},
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{"preserve-default-ignorables",0, 0, G_OPTION_ARG_NONE, &this->preserve_default_ignorables, "Preserve Default-Ignorable characters", nullptr},
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{"remove-default-ignorables",0, 0, G_OPTION_ARG_NONE, &this->remove_default_ignorables, "Remove Default-Ignorable characters", nullptr},
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{"invisible-glyph", 0, 0, G_OPTION_ARG_INT, &this->invisible_glyph, "Glyph value to replace Default-Ignorables with", nullptr},
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{"utf8-clusters", 0, 0, G_OPTION_ARG_NONE, &this->utf8_clusters, "Use UTF8 byte indices, not char indices", nullptr},
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{"cluster-level", 0, 0, G_OPTION_ARG_INT, &this->cluster_level, "Cluster merging level (default: 0)", "0/1/2"},
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{"normalize-glyphs",0, 0, G_OPTION_ARG_NONE, &this->normalize_glyphs, "Rearrange glyph clusters in nominal order", nullptr},
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{"verify", 0, 0, G_OPTION_ARG_NONE, &this->verify, "Perform sanity checks on shaping results", nullptr},
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{"num-iterations", 'n', 0, G_OPTION_ARG_INT, &this->num_iterations, "Run shaper N times (default: 1)", "N"},
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{nullptr}
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};
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parser->add_group (entries,
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"shape",
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"Shape options:",
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"Options for the shaping process",
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this);
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const gchar *features_help = "Comma-separated list of font features\n"
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"\n"
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" Features can be enabled or disabled, either globally or limited to\n"
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" specific character ranges. The format for specifying feature settings\n"
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" follows. All valid CSS font-feature-settings values other than 'normal'\n"
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" and the global values are also accepted, though not documented below.\n"
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" CSS string escapes are not supported."
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"\n"
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" The range indices refer to the positions between Unicode characters,\n"
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" unless the --utf8-clusters is provided, in which case range indices\n"
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" refer to UTF-8 byte indices. The position before the first character\n"
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" is always 0.\n"
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"\n"
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" The format is Python-esque. Here is how it all works:\n"
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"\n"
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" Syntax: Value: Start: End:\n"
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"\n"
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" Setting value:\n"
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" \"kern\" 1 0 ∞ # Turn feature on\n"
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" \"+kern\" 1 0 ∞ # Turn feature on\n"
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" \"-kern\" 0 0 ∞ # Turn feature off\n"
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" \"kern=0\" 0 0 ∞ # Turn feature off\n"
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" \"kern=1\" 1 0 ∞ # Turn feature on\n"
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" \"aalt=2\" 2 0 ∞ # Choose 2nd alternate\n"
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"\n"
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" Setting index:\n"
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" \"kern[]\" 1 0 ∞ # Turn feature on\n"
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" \"kern[:]\" 1 0 ∞ # Turn feature on\n"
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" \"kern[5:]\" 1 5 ∞ # Turn feature on, partial\n"
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" \"kern[:5]\" 1 0 5 # Turn feature on, partial\n"
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" \"kern[3:5]\" 1 3 5 # Turn feature on, range\n"
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" \"kern[3]\" 1 3 3+1 # Turn feature on, single char\n"
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"\n"
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" Mixing it all:\n"
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"\n"
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" \"aalt[3:5]=2\" 2 3 5 # Turn 2nd alternate on for range";
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GOptionEntry entries2[] =
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{
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{"features", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_features, features_help, "list"},
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{nullptr}
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};
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parser->add_group (entries2,
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"features",
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"Features options:",
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"Options for font features used",
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this);
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}
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static gboolean
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parse_font_size (const char *name G_GNUC_UNUSED,
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const char *arg,
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286
util/options.hh
286
util/options.hh
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@ -129,292 +129,6 @@ struct option_parser_t
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extern const unsigned DEFAULT_FONT_SIZE;
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extern const unsigned SUBPIXEL_BITS;
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struct shape_options_t
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{
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~shape_options_t ()
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{
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g_free (direction);
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g_free (language);
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g_free (script);
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free (features);
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g_strfreev (shapers);
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}
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void add_options (option_parser_t *parser);
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void setup_buffer (hb_buffer_t *buffer)
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{
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hb_buffer_set_direction (buffer, hb_direction_from_string (direction, -1));
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hb_buffer_set_script (buffer, hb_script_from_string (script, -1));
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hb_buffer_set_language (buffer, hb_language_from_string (language, -1));
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hb_buffer_set_flags (buffer, (hb_buffer_flags_t)
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(HB_BUFFER_FLAG_DEFAULT |
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(bot ? HB_BUFFER_FLAG_BOT : 0) |
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(eot ? HB_BUFFER_FLAG_EOT : 0) |
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(preserve_default_ignorables ? HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES : 0) |
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(remove_default_ignorables ? HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES : 0) |
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0));
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hb_buffer_set_invisible_glyph (buffer, invisible_glyph);
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hb_buffer_set_cluster_level (buffer, cluster_level);
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hb_buffer_guess_segment_properties (buffer);
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}
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static void copy_buffer_properties (hb_buffer_t *dst, hb_buffer_t *src)
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{
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hb_segment_properties_t props;
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hb_buffer_get_segment_properties (src, &props);
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hb_buffer_set_segment_properties (dst, &props);
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hb_buffer_set_flags (dst, hb_buffer_get_flags (src));
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hb_buffer_set_cluster_level (dst, hb_buffer_get_cluster_level (src));
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}
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void populate_buffer (hb_buffer_t *buffer, const char *text, int text_len,
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const char *text_before, const char *text_after)
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{
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hb_buffer_clear_contents (buffer);
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if (text_before) {
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unsigned int len = strlen (text_before);
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hb_buffer_add_utf8 (buffer, text_before, len, len, 0);
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}
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hb_buffer_add_utf8 (buffer, text, text_len, 0, text_len);
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if (text_after) {
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hb_buffer_add_utf8 (buffer, text_after, -1, 0, 0);
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}
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if (!utf8_clusters) {
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/* Reset cluster values to refer to Unicode character index
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* instead of UTF-8 index. */
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unsigned int num_glyphs = hb_buffer_get_length (buffer);
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hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, nullptr);
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for (unsigned int i = 0; i < num_glyphs; i++)
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{
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info->cluster = i;
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info++;
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}
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}
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setup_buffer (buffer);
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}
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hb_bool_t shape (hb_font_t *font, hb_buffer_t *buffer, const char **error=nullptr)
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{
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hb_buffer_t *text_buffer = nullptr;
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if (verify)
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{
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text_buffer = hb_buffer_create ();
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hb_buffer_append (text_buffer, buffer, 0, -1);
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}
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if (!hb_shape_full (font, buffer, features, num_features, shapers))
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{
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if (error)
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*error = "all shapers failed.";
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goto fail;
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}
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if (normalize_glyphs)
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hb_buffer_normalize_glyphs (buffer);
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if (verify && !verify_buffer (buffer, text_buffer, font, error))
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goto fail;
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if (text_buffer)
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hb_buffer_destroy (text_buffer);
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return true;
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fail:
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if (text_buffer)
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hb_buffer_destroy (text_buffer);
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return false;
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}
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bool verify_buffer (hb_buffer_t *buffer,
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hb_buffer_t *text_buffer,
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hb_font_t *font,
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const char **error=nullptr)
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{
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if (!verify_buffer_monotone (buffer, error))
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return false;
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if (!verify_buffer_safe_to_break (buffer, text_buffer, font, error))
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return false;
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return true;
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}
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bool verify_buffer_monotone (hb_buffer_t *buffer, const char **error=nullptr)
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{
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/* Check that clusters are monotone. */
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if (cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES ||
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cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS)
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{
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bool is_forward = HB_DIRECTION_IS_FORWARD (hb_buffer_get_direction (buffer));
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unsigned int num_glyphs;
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hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, &num_glyphs);
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for (unsigned int i = 1; i < num_glyphs; i++)
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if (info[i-1].cluster != info[i].cluster &&
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(info[i-1].cluster < info[i].cluster) != is_forward)
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{
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if (error)
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*error = "clusters are not monotone.";
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return false;
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}
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}
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return true;
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}
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bool verify_buffer_safe_to_break (hb_buffer_t *buffer,
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hb_buffer_t *text_buffer,
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hb_font_t *font,
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const char **error=nullptr)
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{
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if (cluster_level != HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES &&
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cluster_level != HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS)
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{
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/* Cannot perform this check without monotone clusters.
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* Then again, unsafe-to-break flag is much harder to use without
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* monotone clusters. */
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return true;
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}
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/* Check that breaking up shaping at safe-to-break is indeed safe. */
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hb_buffer_t *fragment = hb_buffer_create ();
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hb_buffer_t *reconstruction = hb_buffer_create ();
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copy_buffer_properties (reconstruction, buffer);
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unsigned int num_glyphs;
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hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, &num_glyphs);
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unsigned int num_chars;
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hb_glyph_info_t *text = hb_buffer_get_glyph_infos (text_buffer, &num_chars);
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/* Chop text and shape fragments. */
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bool forward = HB_DIRECTION_IS_FORWARD (hb_buffer_get_direction (buffer));
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unsigned int start = 0;
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unsigned int text_start = forward ? 0 : num_chars;
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unsigned int text_end = text_start;
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for (unsigned int end = 1; end < num_glyphs + 1; end++)
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{
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if (end < num_glyphs &&
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(info[end].cluster == info[end-1].cluster ||
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info[end-(forward?0:1)].mask & HB_GLYPH_FLAG_UNSAFE_TO_BREAK))
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continue;
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/* Shape segment corresponding to glyphs start..end. */
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if (end == num_glyphs)
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{
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if (forward)
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text_end = num_chars;
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else
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text_start = 0;
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}
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else
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{
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if (forward)
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{
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unsigned int cluster = info[end].cluster;
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while (text_end < num_chars && text[text_end].cluster < cluster)
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text_end++;
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}
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else
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{
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unsigned int cluster = info[end - 1].cluster;
|
||||
while (text_start && text[text_start - 1].cluster >= cluster)
|
||||
text_start--;
|
||||
}
|
||||
}
|
||||
assert (text_start < text_end);
|
||||
|
||||
if (0)
|
||||
printf("start %d end %d text start %d end %d\n", start, end, text_start, text_end);
|
||||
|
||||
hb_buffer_clear_contents (fragment);
|
||||
copy_buffer_properties (fragment, buffer);
|
||||
|
||||
/* TODO: Add pre/post context text. */
|
||||
hb_buffer_flags_t flags = hb_buffer_get_flags (fragment);
|
||||
if (0 < text_start)
|
||||
flags = (hb_buffer_flags_t) (flags & ~HB_BUFFER_FLAG_BOT);
|
||||
if (text_end < num_chars)
|
||||
flags = (hb_buffer_flags_t) (flags & ~HB_BUFFER_FLAG_EOT);
|
||||
hb_buffer_set_flags (fragment, flags);
|
||||
|
||||
hb_buffer_append (fragment, text_buffer, text_start, text_end);
|
||||
if (!hb_shape_full (font, fragment, features, num_features, shapers))
|
||||
{
|
||||
if (error)
|
||||
*error = "all shapers failed while shaping fragment.";
|
||||
hb_buffer_destroy (reconstruction);
|
||||
hb_buffer_destroy (fragment);
|
||||
return false;
|
||||
}
|
||||
hb_buffer_append (reconstruction, fragment, 0, -1);
|
||||
|
||||
start = end;
|
||||
if (forward)
|
||||
text_start = text_end;
|
||||
else
|
||||
text_end = text_start;
|
||||
}
|
||||
|
||||
bool ret = true;
|
||||
hb_buffer_diff_flags_t diff = hb_buffer_diff (reconstruction, buffer, (hb_codepoint_t) -1, 0);
|
||||
if (diff)
|
||||
{
|
||||
if (error)
|
||||
*error = "Safe-to-break test failed.";
|
||||
ret = false;
|
||||
|
||||
/* Return the reconstructed result instead so it can be inspected. */
|
||||
hb_buffer_set_length (buffer, 0);
|
||||
hb_buffer_append (buffer, reconstruction, 0, -1);
|
||||
}
|
||||
|
||||
hb_buffer_destroy (reconstruction);
|
||||
hb_buffer_destroy (fragment);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
void shape_closure (const char *text, int text_len,
|
||||
hb_font_t *font, hb_buffer_t *buffer,
|
||||
hb_set_t *glyphs)
|
||||
{
|
||||
hb_buffer_reset (buffer);
|
||||
hb_buffer_add_utf8 (buffer, text, text_len, 0, text_len);
|
||||
setup_buffer (buffer);
|
||||
hb_ot_shape_glyphs_closure (font, buffer, features, num_features, glyphs);
|
||||
}
|
||||
|
||||
/* Buffer properties */
|
||||
char *direction = nullptr;
|
||||
char *language = nullptr;
|
||||
char *script = nullptr;
|
||||
|
||||
/* Buffer flags */
|
||||
hb_bool_t bot = false;
|
||||
hb_bool_t eot = false;
|
||||
hb_bool_t preserve_default_ignorables = false;
|
||||
hb_bool_t remove_default_ignorables = false;
|
||||
|
||||
hb_feature_t *features = nullptr;
|
||||
unsigned int num_features = 0;
|
||||
char **shapers = nullptr;
|
||||
hb_bool_t utf8_clusters = false;
|
||||
hb_codepoint_t invisible_glyph = 0;
|
||||
hb_buffer_cluster_level_t cluster_level = HB_BUFFER_CLUSTER_LEVEL_DEFAULT;
|
||||
hb_bool_t normalize_glyphs = false;
|
||||
hb_bool_t verify = false;
|
||||
unsigned int num_iterations = 1;
|
||||
};
|
||||
|
||||
|
||||
struct face_options_t
|
||||
{
|
||||
void add_options (option_parser_t *parser);
|
||||
|
|
|
|||
|
|
@ -27,8 +27,7 @@
|
|||
#ifndef HB_SHAPE_CONSUMER_HH
|
||||
#define HB_SHAPE_CONSUMER_HH
|
||||
|
||||
#include "hb.hh"
|
||||
#include "options.hh"
|
||||
#include "shape-options.hh"
|
||||
|
||||
|
||||
template <typename output_t>
|
||||
|
|
|
|||
|
|
@ -0,0 +1,490 @@
|
|||
/*
|
||||
* 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 SHAPE_OPTIONS_HH
|
||||
#define SHAPE_OPTIONS_HH
|
||||
|
||||
#include "options.hh"
|
||||
|
||||
struct shape_options_t
|
||||
{
|
||||
~shape_options_t ()
|
||||
{
|
||||
g_free (direction);
|
||||
g_free (language);
|
||||
g_free (script);
|
||||
free (features);
|
||||
g_strfreev (shapers);
|
||||
}
|
||||
|
||||
void add_options (option_parser_t *parser);
|
||||
|
||||
void setup_buffer (hb_buffer_t *buffer)
|
||||
{
|
||||
hb_buffer_set_direction (buffer, hb_direction_from_string (direction, -1));
|
||||
hb_buffer_set_script (buffer, hb_script_from_string (script, -1));
|
||||
hb_buffer_set_language (buffer, hb_language_from_string (language, -1));
|
||||
hb_buffer_set_flags (buffer, (hb_buffer_flags_t)
|
||||
(HB_BUFFER_FLAG_DEFAULT |
|
||||
(bot ? HB_BUFFER_FLAG_BOT : 0) |
|
||||
(eot ? HB_BUFFER_FLAG_EOT : 0) |
|
||||
(preserve_default_ignorables ? HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES : 0) |
|
||||
(remove_default_ignorables ? HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES : 0) |
|
||||
0));
|
||||
hb_buffer_set_invisible_glyph (buffer, invisible_glyph);
|
||||
hb_buffer_set_cluster_level (buffer, cluster_level);
|
||||
hb_buffer_guess_segment_properties (buffer);
|
||||
}
|
||||
|
||||
static void copy_buffer_properties (hb_buffer_t *dst, hb_buffer_t *src)
|
||||
{
|
||||
hb_segment_properties_t props;
|
||||
hb_buffer_get_segment_properties (src, &props);
|
||||
hb_buffer_set_segment_properties (dst, &props);
|
||||
hb_buffer_set_flags (dst, hb_buffer_get_flags (src));
|
||||
hb_buffer_set_cluster_level (dst, hb_buffer_get_cluster_level (src));
|
||||
}
|
||||
|
||||
void populate_buffer (hb_buffer_t *buffer, const char *text, int text_len,
|
||||
const char *text_before, const char *text_after)
|
||||
{
|
||||
hb_buffer_clear_contents (buffer);
|
||||
if (text_before) {
|
||||
unsigned int len = strlen (text_before);
|
||||
hb_buffer_add_utf8 (buffer, text_before, len, len, 0);
|
||||
}
|
||||
hb_buffer_add_utf8 (buffer, text, text_len, 0, text_len);
|
||||
if (text_after) {
|
||||
hb_buffer_add_utf8 (buffer, text_after, -1, 0, 0);
|
||||
}
|
||||
|
||||
if (!utf8_clusters) {
|
||||
/* Reset cluster values to refer to Unicode character index
|
||||
* instead of UTF-8 index. */
|
||||
unsigned int num_glyphs = hb_buffer_get_length (buffer);
|
||||
hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, nullptr);
|
||||
for (unsigned int i = 0; i < num_glyphs; i++)
|
||||
{
|
||||
info->cluster = i;
|
||||
info++;
|
||||
}
|
||||
}
|
||||
|
||||
setup_buffer (buffer);
|
||||
}
|
||||
|
||||
hb_bool_t shape (hb_font_t *font, hb_buffer_t *buffer, const char **error=nullptr)
|
||||
{
|
||||
hb_buffer_t *text_buffer = nullptr;
|
||||
if (verify)
|
||||
{
|
||||
text_buffer = hb_buffer_create ();
|
||||
hb_buffer_append (text_buffer, buffer, 0, -1);
|
||||
}
|
||||
|
||||
if (!hb_shape_full (font, buffer, features, num_features, shapers))
|
||||
{
|
||||
if (error)
|
||||
*error = "all shapers failed.";
|
||||
goto fail;
|
||||
}
|
||||
|
||||
if (normalize_glyphs)
|
||||
hb_buffer_normalize_glyphs (buffer);
|
||||
|
||||
if (verify && !verify_buffer (buffer, text_buffer, font, error))
|
||||
goto fail;
|
||||
|
||||
if (text_buffer)
|
||||
hb_buffer_destroy (text_buffer);
|
||||
|
||||
return true;
|
||||
|
||||
fail:
|
||||
if (text_buffer)
|
||||
hb_buffer_destroy (text_buffer);
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
bool verify_buffer (hb_buffer_t *buffer,
|
||||
hb_buffer_t *text_buffer,
|
||||
hb_font_t *font,
|
||||
const char **error=nullptr)
|
||||
{
|
||||
if (!verify_buffer_monotone (buffer, error))
|
||||
return false;
|
||||
if (!verify_buffer_safe_to_break (buffer, text_buffer, font, error))
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
bool verify_buffer_monotone (hb_buffer_t *buffer, const char **error=nullptr)
|
||||
{
|
||||
/* Check that clusters are monotone. */
|
||||
if (cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES ||
|
||||
cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS)
|
||||
{
|
||||
bool is_forward = HB_DIRECTION_IS_FORWARD (hb_buffer_get_direction (buffer));
|
||||
|
||||
unsigned int num_glyphs;
|
||||
hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, &num_glyphs);
|
||||
|
||||
for (unsigned int i = 1; i < num_glyphs; i++)
|
||||
if (info[i-1].cluster != info[i].cluster &&
|
||||
(info[i-1].cluster < info[i].cluster) != is_forward)
|
||||
{
|
||||
if (error)
|
||||
*error = "clusters are not monotone.";
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool verify_buffer_safe_to_break (hb_buffer_t *buffer,
|
||||
hb_buffer_t *text_buffer,
|
||||
hb_font_t *font,
|
||||
const char **error=nullptr)
|
||||
{
|
||||
if (cluster_level != HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES &&
|
||||
cluster_level != HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS)
|
||||
{
|
||||
/* Cannot perform this check without monotone clusters.
|
||||
* Then again, unsafe-to-break flag is much harder to use without
|
||||
* monotone clusters. */
|
||||
return true;
|
||||
}
|
||||
|
||||
/* Check that breaking up shaping at safe-to-break is indeed safe. */
|
||||
|
||||
hb_buffer_t *fragment = hb_buffer_create ();
|
||||
hb_buffer_t *reconstruction = hb_buffer_create ();
|
||||
copy_buffer_properties (reconstruction, buffer);
|
||||
|
||||
unsigned int num_glyphs;
|
||||
hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, &num_glyphs);
|
||||
|
||||
unsigned int num_chars;
|
||||
hb_glyph_info_t *text = hb_buffer_get_glyph_infos (text_buffer, &num_chars);
|
||||
|
||||
/* Chop text and shape fragments. */
|
||||
bool forward = HB_DIRECTION_IS_FORWARD (hb_buffer_get_direction (buffer));
|
||||
unsigned int start = 0;
|
||||
unsigned int text_start = forward ? 0 : num_chars;
|
||||
unsigned int text_end = text_start;
|
||||
for (unsigned int end = 1; end < num_glyphs + 1; end++)
|
||||
{
|
||||
if (end < num_glyphs &&
|
||||
(info[end].cluster == info[end-1].cluster ||
|
||||
info[end-(forward?0:1)].mask & HB_GLYPH_FLAG_UNSAFE_TO_BREAK))
|
||||
continue;
|
||||
|
||||
/* Shape segment corresponding to glyphs start..end. */
|
||||
if (end == num_glyphs)
|
||||
{
|
||||
if (forward)
|
||||
text_end = num_chars;
|
||||
else
|
||||
text_start = 0;
|
||||
}
|
||||
else
|
||||
{
|
||||
if (forward)
|
||||
{
|
||||
unsigned int cluster = info[end].cluster;
|
||||
while (text_end < num_chars && text[text_end].cluster < cluster)
|
||||
text_end++;
|
||||
}
|
||||
else
|
||||
{
|
||||
unsigned int cluster = info[end - 1].cluster;
|
||||
while (text_start && text[text_start - 1].cluster >= cluster)
|
||||
text_start--;
|
||||
}
|
||||
}
|
||||
assert (text_start < text_end);
|
||||
|
||||
if (0)
|
||||
printf("start %d end %d text start %d end %d\n", start, end, text_start, text_end);
|
||||
|
||||
hb_buffer_clear_contents (fragment);
|
||||
copy_buffer_properties (fragment, buffer);
|
||||
|
||||
/* TODO: Add pre/post context text. */
|
||||
hb_buffer_flags_t flags = hb_buffer_get_flags (fragment);
|
||||
if (0 < text_start)
|
||||
flags = (hb_buffer_flags_t) (flags & ~HB_BUFFER_FLAG_BOT);
|
||||
if (text_end < num_chars)
|
||||
flags = (hb_buffer_flags_t) (flags & ~HB_BUFFER_FLAG_EOT);
|
||||
hb_buffer_set_flags (fragment, flags);
|
||||
|
||||
hb_buffer_append (fragment, text_buffer, text_start, text_end);
|
||||
if (!hb_shape_full (font, fragment, features, num_features, shapers))
|
||||
{
|
||||
if (error)
|
||||
*error = "all shapers failed while shaping fragment.";
|
||||
hb_buffer_destroy (reconstruction);
|
||||
hb_buffer_destroy (fragment);
|
||||
return false;
|
||||
}
|
||||
hb_buffer_append (reconstruction, fragment, 0, -1);
|
||||
|
||||
start = end;
|
||||
if (forward)
|
||||
text_start = text_end;
|
||||
else
|
||||
text_end = text_start;
|
||||
}
|
||||
|
||||
bool ret = true;
|
||||
hb_buffer_diff_flags_t diff = hb_buffer_diff (reconstruction, buffer, (hb_codepoint_t) -1, 0);
|
||||
if (diff)
|
||||
{
|
||||
if (error)
|
||||
*error = "Safe-to-break test failed.";
|
||||
ret = false;
|
||||
|
||||
/* Return the reconstructed result instead so it can be inspected. */
|
||||
hb_buffer_set_length (buffer, 0);
|
||||
hb_buffer_append (buffer, reconstruction, 0, -1);
|
||||
}
|
||||
|
||||
hb_buffer_destroy (reconstruction);
|
||||
hb_buffer_destroy (fragment);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
void shape_closure (const char *text, int text_len,
|
||||
hb_font_t *font, hb_buffer_t *buffer,
|
||||
hb_set_t *glyphs)
|
||||
{
|
||||
hb_buffer_reset (buffer);
|
||||
hb_buffer_add_utf8 (buffer, text, text_len, 0, text_len);
|
||||
setup_buffer (buffer);
|
||||
hb_ot_shape_glyphs_closure (font, buffer, features, num_features, glyphs);
|
||||
}
|
||||
|
||||
/* Buffer properties */
|
||||
char *direction = nullptr;
|
||||
char *language = nullptr;
|
||||
char *script = nullptr;
|
||||
|
||||
/* Buffer flags */
|
||||
hb_bool_t bot = false;
|
||||
hb_bool_t eot = false;
|
||||
hb_bool_t preserve_default_ignorables = false;
|
||||
hb_bool_t remove_default_ignorables = false;
|
||||
|
||||
hb_feature_t *features = nullptr;
|
||||
unsigned int num_features = 0;
|
||||
char **shapers = nullptr;
|
||||
hb_bool_t utf8_clusters = false;
|
||||
hb_codepoint_t invisible_glyph = 0;
|
||||
hb_buffer_cluster_level_t cluster_level = HB_BUFFER_CLUSTER_LEVEL_DEFAULT;
|
||||
hb_bool_t normalize_glyphs = false;
|
||||
hb_bool_t verify = false;
|
||||
unsigned int num_iterations = 1;
|
||||
};
|
||||
|
||||
|
||||
static gboolean
|
||||
parse_shapers (const char *name G_GNUC_UNUSED,
|
||||
const char *arg,
|
||||
gpointer data,
|
||||
GError **error)
|
||||
{
|
||||
shape_options_t *shape_opts = (shape_options_t *) data;
|
||||
char **shapers = g_strsplit (arg, ",", 0);
|
||||
|
||||
for (char **shaper = shapers; *shaper; shaper++) {
|
||||
bool found = false;
|
||||
for (const char **hb_shaper = hb_shape_list_shapers (); *hb_shaper; hb_shaper++) {
|
||||
if (strcmp (*shaper, *hb_shaper) == 0) {
|
||||
found = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (!found) {
|
||||
g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
|
||||
"Unknown or unsupported shaper: %s", *shaper);
|
||||
g_strfreev (shapers);
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
g_strfreev (shape_opts->shapers);
|
||||
shape_opts->shapers = shapers;
|
||||
return true;
|
||||
}
|
||||
|
||||
static G_GNUC_NORETURN gboolean
|
||||
list_shapers (const char *name G_GNUC_UNUSED,
|
||||
const char *arg G_GNUC_UNUSED,
|
||||
gpointer data G_GNUC_UNUSED,
|
||||
GError **error G_GNUC_UNUSED)
|
||||
{
|
||||
for (const char **shaper = hb_shape_list_shapers (); *shaper; shaper++)
|
||||
g_printf ("%s\n", *shaper);
|
||||
|
||||
exit(0);
|
||||
}
|
||||
|
||||
|
||||
static gboolean
|
||||
parse_features (const char *name G_GNUC_UNUSED,
|
||||
const char *arg,
|
||||
gpointer data,
|
||||
GError **error G_GNUC_UNUSED)
|
||||
{
|
||||
shape_options_t *shape_opts = (shape_options_t *) data;
|
||||
char *s = (char *) arg;
|
||||
size_t l = strlen (s);
|
||||
char *p;
|
||||
|
||||
shape_opts->num_features = 0;
|
||||
g_free (shape_opts->features);
|
||||
shape_opts->features = nullptr;
|
||||
|
||||
/* if the string is quoted, strip the quotes */
|
||||
if (s[0] == s[l - 1] && (s[0] == '\"' || s[0] == '\''))
|
||||
{
|
||||
s[l - 1] = '\0';
|
||||
s++;
|
||||
}
|
||||
|
||||
if (!*s)
|
||||
return true;
|
||||
|
||||
/* count the features first, so we can allocate memory */
|
||||
p = s;
|
||||
do {
|
||||
shape_opts->num_features++;
|
||||
p = strchr (p, ',');
|
||||
if (p)
|
||||
p++;
|
||||
} while (p);
|
||||
|
||||
shape_opts->features = (hb_feature_t *) calloc (shape_opts->num_features, sizeof (*shape_opts->features));
|
||||
if (!shape_opts->features)
|
||||
return false;
|
||||
|
||||
/* now do the actual parsing */
|
||||
p = s;
|
||||
shape_opts->num_features = 0;
|
||||
while (p && *p) {
|
||||
char *end = strchr (p, ',');
|
||||
if (hb_feature_from_string (p, end ? end - p : -1, &shape_opts->features[shape_opts->num_features]))
|
||||
shape_opts->num_features++;
|
||||
p = end ? end + 1 : nullptr;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
void
|
||||
shape_options_t::add_options (option_parser_t *parser)
|
||||
{
|
||||
GOptionEntry entries[] =
|
||||
{
|
||||
{"list-shapers", 0, G_OPTION_FLAG_NO_ARG,
|
||||
G_OPTION_ARG_CALLBACK, (gpointer) &list_shapers, "List available shapers and quit", nullptr},
|
||||
{"shaper", 0, G_OPTION_FLAG_HIDDEN,
|
||||
G_OPTION_ARG_CALLBACK, (gpointer) &parse_shapers, "Hidden duplicate of --shapers", nullptr},
|
||||
{"shapers", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_shapers, "Set comma-separated list of shapers to try","list"},
|
||||
{"direction", 0, 0, G_OPTION_ARG_STRING, &this->direction, "Set text direction (default: auto)", "ltr/rtl/ttb/btt"},
|
||||
{"language", 0, 0, G_OPTION_ARG_STRING, &this->language, "Set text language (default: $LANG)", "langstr"},
|
||||
{"script", 0, 0, G_OPTION_ARG_STRING, &this->script, "Set text script (default: auto)", "ISO-15924 tag"},
|
||||
{"bot", 0, 0, G_OPTION_ARG_NONE, &this->bot, "Treat text as beginning-of-paragraph", nullptr},
|
||||
{"eot", 0, 0, G_OPTION_ARG_NONE, &this->eot, "Treat text as end-of-paragraph", nullptr},
|
||||
{"preserve-default-ignorables",0, 0, G_OPTION_ARG_NONE, &this->preserve_default_ignorables, "Preserve Default-Ignorable characters", nullptr},
|
||||
{"remove-default-ignorables",0, 0, G_OPTION_ARG_NONE, &this->remove_default_ignorables, "Remove Default-Ignorable characters", nullptr},
|
||||
{"invisible-glyph", 0, 0, G_OPTION_ARG_INT, &this->invisible_glyph, "Glyph value to replace Default-Ignorables with", nullptr},
|
||||
{"utf8-clusters", 0, 0, G_OPTION_ARG_NONE, &this->utf8_clusters, "Use UTF8 byte indices, not char indices", nullptr},
|
||||
{"cluster-level", 0, 0, G_OPTION_ARG_INT, &this->cluster_level, "Cluster merging level (default: 0)", "0/1/2"},
|
||||
{"normalize-glyphs",0, 0, G_OPTION_ARG_NONE, &this->normalize_glyphs, "Rearrange glyph clusters in nominal order", nullptr},
|
||||
{"verify", 0, 0, G_OPTION_ARG_NONE, &this->verify, "Perform sanity checks on shaping results", nullptr},
|
||||
{"num-iterations", 'n', 0, G_OPTION_ARG_INT, &this->num_iterations, "Run shaper N times (default: 1)", "N"},
|
||||
{nullptr}
|
||||
};
|
||||
parser->add_group (entries,
|
||||
"shape",
|
||||
"Shape options:",
|
||||
"Options for the shaping process",
|
||||
this);
|
||||
|
||||
const gchar *features_help = "Comma-separated list of font features\n"
|
||||
"\n"
|
||||
" Features can be enabled or disabled, either globally or limited to\n"
|
||||
" specific character ranges. The format for specifying feature settings\n"
|
||||
" follows. All valid CSS font-feature-settings values other than 'normal'\n"
|
||||
" and the global values are also accepted, though not documented below.\n"
|
||||
" CSS string escapes are not supported."
|
||||
"\n"
|
||||
" The range indices refer to the positions between Unicode characters,\n"
|
||||
" unless the --utf8-clusters is provided, in which case range indices\n"
|
||||
" refer to UTF-8 byte indices. The position before the first character\n"
|
||||
" is always 0.\n"
|
||||
"\n"
|
||||
" The format is Python-esque. Here is how it all works:\n"
|
||||
"\n"
|
||||
" Syntax: Value: Start: End:\n"
|
||||
"\n"
|
||||
" Setting value:\n"
|
||||
" \"kern\" 1 0 ∞ # Turn feature on\n"
|
||||
" \"+kern\" 1 0 ∞ # Turn feature on\n"
|
||||
" \"-kern\" 0 0 ∞ # Turn feature off\n"
|
||||
" \"kern=0\" 0 0 ∞ # Turn feature off\n"
|
||||
" \"kern=1\" 1 0 ∞ # Turn feature on\n"
|
||||
" \"aalt=2\" 2 0 ∞ # Choose 2nd alternate\n"
|
||||
"\n"
|
||||
" Setting index:\n"
|
||||
" \"kern[]\" 1 0 ∞ # Turn feature on\n"
|
||||
" \"kern[:]\" 1 0 ∞ # Turn feature on\n"
|
||||
" \"kern[5:]\" 1 5 ∞ # Turn feature on, partial\n"
|
||||
" \"kern[:5]\" 1 0 5 # Turn feature on, partial\n"
|
||||
" \"kern[3:5]\" 1 3 5 # Turn feature on, range\n"
|
||||
" \"kern[3]\" 1 3 3+1 # Turn feature on, single char\n"
|
||||
"\n"
|
||||
" Mixing it all:\n"
|
||||
"\n"
|
||||
" \"aalt[3:5]=2\" 2 3 5 # Turn 2nd alternate on for range";
|
||||
|
||||
GOptionEntry entries2[] =
|
||||
{
|
||||
{"features", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_features, features_help, "list"},
|
||||
{nullptr}
|
||||
};
|
||||
parser->add_group (entries2,
|
||||
"features",
|
||||
"Features options:",
|
||||
"Options for font features used",
|
||||
this);
|
||||
}
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue