487 lines
14 KiB
C++
487 lines
14 KiB
C++
/*
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* Copyright © 2012,2013 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#include "hb-buffer.hh"
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static const char *serialize_formats[] = {
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"text",
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"json",
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nullptr
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};
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/**
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* hb_buffer_serialize_list_formats:
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*
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* Returns a list of supported buffer serialization formats.
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*
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* Return value: (transfer none):
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* A string array of buffer serialization formats. Should not be freed.
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*
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* Since: 0.9.7
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**/
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const char **
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hb_buffer_serialize_list_formats (void)
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{
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return serialize_formats;
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}
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/**
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* hb_buffer_serialize_format_from_string:
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* @str: (array length=len) (element-type uint8_t): a string to parse
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* @len: length of @str, or -1 if string is %NULL terminated
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*
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* Parses a string into an #hb_buffer_serialize_format_t. Does not check if
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* @str is a valid buffer serialization format, use
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* hb_buffer_serialize_list_formats() to get the list of supported formats.
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*
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* Return value:
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* The parsed #hb_buffer_serialize_format_t.
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*
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* Since: 0.9.7
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**/
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hb_buffer_serialize_format_t
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hb_buffer_serialize_format_from_string (const char *str, int len)
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{
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/* Upper-case it. */
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return (hb_buffer_serialize_format_t) (hb_tag_from_string (str, len) & ~0x20202020u);
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}
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/**
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* hb_buffer_serialize_format_to_string:
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* @format: an #hb_buffer_serialize_format_t to convert.
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*
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* Converts @format to the string corresponding it, or %NULL if it is not a valid
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* #hb_buffer_serialize_format_t.
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*
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* Return value: (transfer none):
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* A %NULL terminated string corresponding to @format. Should not be freed.
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*
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* Since: 0.9.7
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**/
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const char *
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hb_buffer_serialize_format_to_string (hb_buffer_serialize_format_t format)
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{
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switch (format)
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{
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case HB_BUFFER_SERIALIZE_FORMAT_TEXT: return serialize_formats[0];
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case HB_BUFFER_SERIALIZE_FORMAT_JSON: return serialize_formats[1];
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default:
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case HB_BUFFER_SERIALIZE_FORMAT_INVALID: return nullptr;
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}
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}
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static unsigned int
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_hb_buffer_serialize_glyphs_json (hb_buffer_t *buffer,
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unsigned int start,
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unsigned int end,
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char *buf,
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unsigned int buf_size,
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unsigned int *buf_consumed,
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hb_font_t *font,
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hb_buffer_serialize_flags_t flags)
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{
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hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, nullptr);
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hb_glyph_position_t *pos = (flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS) ?
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nullptr : hb_buffer_get_glyph_positions (buffer, nullptr);
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*buf_consumed = 0;
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hb_position_t x = 0, y = 0;
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for (unsigned int i = start; i < end; i++)
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{
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char b[1024];
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char *p = b;
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/* In the following code, we know b is large enough that no overflow can happen. */
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#define APPEND(s) HB_STMT_START { strcpy (p, s); p += strlen (s); } HB_STMT_END
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if (i)
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*p++ = ',';
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*p++ = '{';
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APPEND ("\"g\":");
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if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES))
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{
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char g[128];
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hb_font_glyph_to_string (font, info[i].codepoint, g, sizeof (g));
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*p++ = '"';
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for (char *q = g; *q; q++) {
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if (*q == '"')
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*p++ = '\\';
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*p++ = *q;
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}
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*p++ = '"';
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}
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else
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p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "%u", info[i].codepoint));
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if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS)) {
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p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"cl\":%u", info[i].cluster));
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}
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if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS))
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{
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p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"dx\":%d,\"dy\":%d",
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x+pos[i].x_offset, y+pos[i].y_offset));
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if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES))
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p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"ax\":%d,\"ay\":%d",
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pos[i].x_advance, pos[i].y_advance));
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}
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if (flags & HB_BUFFER_SERIALIZE_FLAG_GLYPH_FLAGS)
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{
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if (info[i].mask & HB_GLYPH_FLAG_DEFINED)
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p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"fl\":%u", info[i].mask & HB_GLYPH_FLAG_DEFINED));
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}
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if (flags & HB_BUFFER_SERIALIZE_FLAG_GLYPH_EXTENTS)
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{
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hb_glyph_extents_t extents;
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hb_font_get_glyph_extents(font, info[i].codepoint, &extents);
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p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"xb\":%d,\"yb\":%d",
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extents.x_bearing, extents.y_bearing));
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p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"w\":%d,\"h\":%d",
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extents.width, extents.height));
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}
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*p++ = '}';
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unsigned int l = p - b;
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if (buf_size > l)
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{
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memcpy (buf, b, l);
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buf += l;
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buf_size -= l;
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*buf_consumed += l;
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*buf = '\0';
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} else
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return i - start;
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if (pos && (flags & HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES))
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{
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x += pos[i].x_advance;
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y += pos[i].y_advance;
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}
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}
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return end - start;
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}
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static unsigned int
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_hb_buffer_serialize_glyphs_text (hb_buffer_t *buffer,
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unsigned int start,
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unsigned int end,
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char *buf,
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unsigned int buf_size,
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unsigned int *buf_consumed,
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hb_font_t *font,
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hb_buffer_serialize_flags_t flags)
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{
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hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, nullptr);
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hb_glyph_position_t *pos = (flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS) ?
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nullptr : hb_buffer_get_glyph_positions (buffer, nullptr);
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*buf_consumed = 0;
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hb_position_t x = 0, y = 0;
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for (unsigned int i = start; i < end; i++)
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{
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char b[1024];
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char *p = b;
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/* In the following code, we know b is large enough that no overflow can happen. */
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if (i)
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*p++ = '|';
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if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES))
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{
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hb_font_glyph_to_string (font, info[i].codepoint, p, 128);
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p += strlen (p);
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}
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else
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p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "%u", info[i].codepoint));
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if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS)) {
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p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "=%u", info[i].cluster));
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}
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if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS))
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{
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if (x+pos[i].x_offset || y+pos[i].y_offset)
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p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "@%d,%d", x+pos[i].x_offset, y+pos[i].y_offset));
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if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES))
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{
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*p++ = '+';
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p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "%d", pos[i].x_advance));
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if (pos[i].y_advance)
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p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",%d", pos[i].y_advance));
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}
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}
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if (flags & HB_BUFFER_SERIALIZE_FLAG_GLYPH_FLAGS)
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{
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if (info[i].mask &HB_GLYPH_FLAG_DEFINED)
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p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "#%X", info[i].mask &HB_GLYPH_FLAG_DEFINED));
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}
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if (flags & HB_BUFFER_SERIALIZE_FLAG_GLYPH_EXTENTS)
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{
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hb_glyph_extents_t extents;
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hb_font_get_glyph_extents(font, info[i].codepoint, &extents);
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p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "<%d,%d,%d,%d>", extents.x_bearing, extents.y_bearing, extents.width, extents.height));
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}
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unsigned int l = p - b;
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if (buf_size > l)
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{
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memcpy (buf, b, l);
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buf += l;
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buf_size -= l;
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*buf_consumed += l;
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*buf = '\0';
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} else
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return i - start;
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if (pos && (flags & HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES))
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{
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x += pos[i].x_advance;
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y += pos[i].y_advance;
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}
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}
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return end - start;
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}
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/**
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* hb_buffer_serialize_glyphs:
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* @buffer: an #hb_buffer_t buffer.
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* @start: the first item in @buffer to serialize.
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* @end: the last item in @buffer to serialize.
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* @buf: (out) (array length=buf_size) (element-type uint8_t): output string to
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* write serialized buffer into.
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* @buf_size: the size of @buf.
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* @buf_consumed: (out) (allow-none): if not %NULL, will be set to the number of byes written into @buf.
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* @font: (allow-none): the #hb_font_t used to shape this buffer, needed to
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* read glyph names and extents. If %NULL, and empty font will be used.
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* @format: the #hb_buffer_serialize_format_t to use for formatting the output.
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* @flags: the #hb_buffer_serialize_flags_t that control what glyph properties
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* to serialize.
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*
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* Serializes @buffer into a textual representation of its glyph content,
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* useful for showing the contents of the buffer, for example during debugging.
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* There are currently two supported serialization formats:
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*
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* ## text
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* A human-readable, plain text format.
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* The serialized glyphs will look something like:
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*
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* ```
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* [uni0651=0@518,0+0|uni0628=0+1897]
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* ```
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* - The serialized glyphs are delimited with `[` and `]`.
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* - Glyphs are separated with `|`
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* - Each glyph starts with glyph name, or glyph index if
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* #HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES flag is set. Then,
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* - If #HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS is not set, `=` then #hb_glyph_info_t.cluster.
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* - If #HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS is not set, the #hb_glyph_position_t in the format:
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* - If both #hb_glyph_position_t.x_offset and #hb_glyph_position_t.y_offset are not 0, `@x_offset,y_offset`. Then,
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* - `+x_advance`, then `,y_advance` if #hb_glyph_position_t.y_advance is not 0. Then,
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* - If #HB_BUFFER_SERIALIZE_FLAG_GLYPH_EXTENTS is set, the
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* #hb_glyph_extents_t in the format
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* `<x_bearing,y_bearing,width,height>`
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*
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* ## json
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* TODO.
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*
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* Return value:
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* The number of serialized items.
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*
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* Since: 0.9.7
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**/
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unsigned int
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hb_buffer_serialize_glyphs (hb_buffer_t *buffer,
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unsigned int start,
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unsigned int end,
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char *buf,
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unsigned int buf_size,
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unsigned int *buf_consumed,
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hb_font_t *font,
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hb_buffer_serialize_format_t format,
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hb_buffer_serialize_flags_t flags)
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{
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assert (start <= end && end <= buffer->len);
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unsigned int sconsumed;
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if (!buf_consumed)
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buf_consumed = &sconsumed;
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*buf_consumed = 0;
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if (buf_size)
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*buf = '\0';
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assert ((!buffer->len && buffer->content_type == HB_BUFFER_CONTENT_TYPE_INVALID) ||
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buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS);
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if (!buffer->have_positions)
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flags |= HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS;
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if (unlikely (start == end))
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return 0;
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if (!font)
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font = hb_font_get_empty ();
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switch (format)
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{
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case HB_BUFFER_SERIALIZE_FORMAT_TEXT:
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return _hb_buffer_serialize_glyphs_text (buffer, start, end,
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buf, buf_size, buf_consumed,
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font, flags);
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case HB_BUFFER_SERIALIZE_FORMAT_JSON:
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return _hb_buffer_serialize_glyphs_json (buffer, start, end,
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buf, buf_size, buf_consumed,
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font, flags);
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default:
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case HB_BUFFER_SERIALIZE_FORMAT_INVALID:
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return 0;
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}
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}
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static hb_bool_t
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parse_uint (const char *pp, const char *end, uint32_t *pv)
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{
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char buf[32];
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unsigned int len = MIN (ARRAY_LENGTH (buf) - 1, (unsigned int) (end - pp));
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strncpy (buf, pp, len);
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buf[len] = '\0';
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char *p = buf;
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char *pend = p;
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uint32_t v;
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errno = 0;
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v = strtol (p, &pend, 10);
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if (errno || p == pend || pend - p != end - pp)
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return false;
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*pv = v;
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return true;
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}
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static hb_bool_t
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parse_int (const char *pp, const char *end, int32_t *pv)
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{
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char buf[32];
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unsigned int len = MIN (ARRAY_LENGTH (buf) - 1, (unsigned int) (end - pp));
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strncpy (buf, pp, len);
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buf[len] = '\0';
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char *p = buf;
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char *pend = p;
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int32_t v;
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errno = 0;
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v = strtol (p, &pend, 10);
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if (errno || p == pend || pend - p != end - pp)
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return false;
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*pv = v;
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return true;
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}
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#include "hb-buffer-deserialize-json.hh"
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#include "hb-buffer-deserialize-text.hh"
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/**
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* hb_buffer_deserialize_glyphs:
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* @buffer: an #hb_buffer_t buffer.
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* @buf: (array length=buf_len):
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* @buf_len:
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* @end_ptr: (out):
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* @font:
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* @format:
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*
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*
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*
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* Return value:
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*
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* Since: 0.9.7
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**/
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hb_bool_t
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hb_buffer_deserialize_glyphs (hb_buffer_t *buffer,
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const char *buf,
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int buf_len, /* -1 means nul-terminated */
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const char **end_ptr, /* May be nullptr */
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hb_font_t *font, /* May be nullptr */
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hb_buffer_serialize_format_t format)
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{
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const char *end;
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if (!end_ptr)
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end_ptr = &end;
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*end_ptr = buf;
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assert ((!buffer->len && buffer->content_type == HB_BUFFER_CONTENT_TYPE_INVALID) ||
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buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS);
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if (buf_len == -1)
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buf_len = strlen (buf);
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if (!buf_len)
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{
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*end_ptr = buf;
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return false;
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}
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hb_buffer_set_content_type (buffer, HB_BUFFER_CONTENT_TYPE_GLYPHS);
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if (!font)
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font = hb_font_get_empty ();
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switch (format)
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{
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case HB_BUFFER_SERIALIZE_FORMAT_TEXT:
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return _hb_buffer_deserialize_glyphs_text (buffer,
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buf, buf_len, end_ptr,
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font);
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case HB_BUFFER_SERIALIZE_FORMAT_JSON:
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return _hb_buffer_deserialize_glyphs_json (buffer,
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buf, buf_len, end_ptr,
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font);
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default:
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case HB_BUFFER_SERIALIZE_FORMAT_INVALID:
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return false;
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}
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}
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