/* * Copyright © 2012 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 */ #include "hb-private.hh" #include "hb-old-private.hh" #include "hb-font-private.hh" #include "hb-buffer-private.hh" #include #ifndef HB_DEBUG_OLD #define HB_DEBUG_OLD (HB_DEBUG+0) #endif static HB_Script hb_old_script_from_script (hb_script_t script) { switch ((hb_tag_t) script) { default: case HB_SCRIPT_COMMON: return HB_Script_Common; case HB_SCRIPT_GREEK: return HB_Script_Greek; case HB_SCRIPT_CYRILLIC: return HB_Script_Cyrillic; case HB_SCRIPT_ARMENIAN: return HB_Script_Armenian; case HB_SCRIPT_HEBREW: return HB_Script_Hebrew; case HB_SCRIPT_ARABIC: return HB_Script_Arabic; case HB_SCRIPT_SYRIAC: return HB_Script_Syriac; case HB_SCRIPT_THAANA: return HB_Script_Thaana; case HB_SCRIPT_DEVANAGARI: return HB_Script_Devanagari; case HB_SCRIPT_BENGALI: return HB_Script_Bengali; case HB_SCRIPT_GURMUKHI: return HB_Script_Gurmukhi; case HB_SCRIPT_GUJARATI: return HB_Script_Gujarati; case HB_SCRIPT_ORIYA: return HB_Script_Oriya; case HB_SCRIPT_TAMIL: return HB_Script_Tamil; case HB_SCRIPT_TELUGU: return HB_Script_Telugu; case HB_SCRIPT_KANNADA: return HB_Script_Kannada; case HB_SCRIPT_MALAYALAM: return HB_Script_Malayalam; case HB_SCRIPT_SINHALA: return HB_Script_Sinhala; case HB_SCRIPT_THAI: return HB_Script_Thai; case HB_SCRIPT_LAO: return HB_Script_Lao; case HB_SCRIPT_TIBETAN: return HB_Script_Tibetan; case HB_SCRIPT_MYANMAR: return HB_Script_Myanmar; case HB_SCRIPT_GEORGIAN: return HB_Script_Georgian; case HB_SCRIPT_HANGUL: return HB_Script_Hangul; case HB_SCRIPT_OGHAM: return HB_Script_Ogham; case HB_SCRIPT_RUNIC: return HB_Script_Runic; case HB_SCRIPT_KHMER: return HB_Script_Khmer; case HB_SCRIPT_NKO: return HB_Script_Nko; case HB_SCRIPT_INHERITED: return HB_Script_Inherited; } } static HB_Bool hb_old_convertStringToGlyphIndices (HB_Font old_font, const HB_UChar16 *string, hb_uint32 length, HB_Glyph *glyphs, hb_uint32 *numGlyphs, HB_Bool rightToLeft) { hb_font_t *font = (hb_font_t *) old_font->userData; for (unsigned int i = 0; i < length; i++) { hb_codepoint_t u; /* TODO Handle UTF-16. Ugh */ u = string[i]; if (rightToLeft) u = hb_unicode_mirroring (hb_unicode_funcs_get_default (), u); hb_font_get_glyph (font, u, 0, &u); /* TODO Variation selectors */ glyphs[i] = u; } *numGlyphs = length; // XXX return true; } static void hb_old_getGlyphAdvances (HB_Font old_font, const HB_Glyph *glyphs, hb_uint32 numGlyphs, HB_Fixed *advances, int flags /*HB_ShaperFlag*/) { hb_font_t *font = (hb_font_t *) old_font->userData; for (unsigned int i = 0; i < numGlyphs; i++) advances[i] = hb_font_get_glyph_h_advance (font, glyphs[i]); } static HB_Bool hb_old_canRender (HB_Font old_font, const HB_UChar16 *string, hb_uint32 length) { return true; // TODO } static HB_Error hb_old_getPointInOutline (HB_Font old_font, HB_Glyph glyph, int flags /*HB_ShaperFlag*/, hb_uint32 point, HB_Fixed *xpos, HB_Fixed *ypos, hb_uint32 *nPoints) { return HB_Err_Ok; // TODO } static void hb_old_getGlyphMetrics (HB_Font old_font, HB_Glyph glyph, HB_GlyphMetrics *metrics) { // TODO } static HB_Fixed hb_old_getFontMetric (HB_Font old_font, HB_FontMetric metric) { return 0; // TODO } static const HB_FontClass hb_old_font_class = { hb_old_convertStringToGlyphIndices, hb_old_getGlyphAdvances, hb_old_canRender, hb_old_getPointInOutline, hb_old_getGlyphMetrics, hb_old_getFontMetric }; static hb_user_data_key_t hb_old_data_key; static HB_Error table_func (void *font, HB_Tag tag, HB_Byte *buffer, HB_UInt *length) { hb_face_t *face = (hb_face_t *) font; hb_blob_t *blob = hb_face_reference_table (face, (hb_tag_t) tag); unsigned int capacity = *length; *length = hb_blob_get_length (blob); memcpy (buffer, hb_blob_get_data (blob, NULL), MIN (capacity, *length)); hb_blob_destroy (blob); return HB_Err_Ok; } static HB_Face _hb_old_face_get (hb_face_t *face) { HB_Face data = (HB_Face) hb_face_get_user_data (face, &hb_old_data_key); if (likely (data)) return data; data = HB_NewFace (face, table_func); if (unlikely (!data)) { DEBUG_MSG (OLD, face, "HB_NewFace failed"); return NULL; } if (unlikely (!hb_face_set_user_data (face, &hb_old_data_key, data, (hb_destroy_func_t) HB_FreeFace, false))) { HB_FreeFace (data); data = (HB_Face) hb_face_get_user_data (face, &hb_old_data_key); if (data) return data; else return NULL; } return data; } static HB_Font _hb_old_font_get (hb_font_t *font) { HB_Font data = (HB_Font) calloc (1, sizeof (HB_FontRec)); if (unlikely (!data)) { DEBUG_MSG (OLD, font, "malloc()ing HB_Font failed"); return NULL; } data->klass = &hb_old_font_class; data->x_ppem = font->x_ppem; data->y_ppem = font->y_ppem; data->x_scale = font->x_scale; // XXX data->y_scale = font->y_scale; // XXX data->userData = font; if (unlikely (!hb_font_set_user_data (font, &hb_old_data_key, data, (hb_destroy_func_t) free, false))) { free (data); data = (HB_Font) hb_font_get_user_data (font, &hb_old_data_key); if (data) return data; else return NULL; } return data; } hb_bool_t _hb_old_shape (hb_font_t *font, hb_buffer_t *buffer, const hb_feature_t *features, unsigned int num_features) { if (unlikely (!buffer->len)) return true; buffer->guess_properties (); #define FAIL(...) \ HB_STMT_START { \ DEBUG_MSG (OLD, NULL, __VA_ARGS__); \ return false; \ } HB_STMT_END; HB_Face old_face = _hb_old_face_get (font->face); if (unlikely (!old_face)) FAIL ("Couldn't get old face"); HB_Font old_font = _hb_old_font_get (font); if (unlikely (!old_font)) FAIL ("Couldn't get old font"); retry: unsigned int scratch_size; char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size); #define utf16_index() var1.u32 HB_UChar16 *pchars = (HB_UChar16 *) scratch; unsigned int chars_len = 0; for (unsigned int i = 0; i < buffer->len; i++) { hb_codepoint_t c = buffer->info[i].codepoint; buffer->info[i].utf16_index() = chars_len; if (likely (c < 0x10000)) pchars[chars_len++] = c; else if (unlikely (c >= 0x110000)) pchars[chars_len++] = 0xFFFD; else { pchars[chars_len++] = 0xD800 + ((c - 0x10000) >> 10); pchars[chars_len++] = 0xDC00 + ((c - 0x10000) & ((1 << 10) - 1)); } } #undef utf16_index #define ALLOCATE_ARRAY(Type, name, len) \ name = (Type *) scratch; \ scratch += len * sizeof (name[0]); \ scratch_size -= len * sizeof (name[0]); HB_ShaperItem item = {0}; ALLOCATE_ARRAY (const HB_UChar16, item.string, chars_len); item.stringLength = chars_len; item.item.pos = 0; item.item.length = item.stringLength; item.item.script = hb_old_script_from_script (buffer->props.script); item.item.bidiLevel = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1; item.font = old_font; item.face = old_face; item.shaperFlags = 0; item.glyphIndicesPresent = false; /* TODO Alignment. */ unsigned int num_glyphs = scratch_size / (sizeof (HB_Glyph) + sizeof (HB_GlyphAttributes) + sizeof (HB_Fixed) + sizeof (HB_FixedPoint) + sizeof (unsigned short)); item.num_glyphs = num_glyphs; ALLOCATE_ARRAY (HB_Glyph, item.glyphs, num_glyphs); ALLOCATE_ARRAY (HB_GlyphAttributes, item.attributes, num_glyphs); ALLOCATE_ARRAY (HB_Fixed, item.advances, num_glyphs); ALLOCATE_ARRAY (HB_FixedPoint, item.offsets, num_glyphs); ALLOCATE_ARRAY (unsigned short, item.log_clusters, num_glyphs); if (!HB_ShapeItem (&item)) return false; if (unlikely (item.num_glyphs > num_glyphs)) { buffer->ensure (buffer->allocated * 2); if (buffer->in_error) FAIL ("Buffer resize failed"); goto retry; } num_glyphs = item.num_glyphs; #undef ALLOCATE_ARRAY hb_glyph_info_t *info = buffer->info; for (unsigned int i = 0; i < num_glyphs; i++) { info[i].codepoint = item.glyphs[i]; info[i].cluster = item.log_clusters[i]; info[i].mask = item.advances[i]; info[i].var1.u32 = item.offsets[i].x; info[i].var2.u32 = item.offsets[i].y; } buffer->len = num_glyphs; buffer->clear_positions (); unsigned int count = buffer->len; for (unsigned int i = 0; i < count; ++i) { hb_glyph_info_t *info = &buffer->info[i]; hb_glyph_position_t *pos = &buffer->pos[i]; /* TODO vertical */ pos->x_advance = info->mask; pos->x_offset = info->var1.u32; pos->y_offset = info->var2.u32; } if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction)) buffer->reverse (); return true; }