author | prr |
Wed, 30 May 2018 12:20:00 -0700 | |
changeset 50352 | 25db2c8f3cf8 |
parent 48274 | 51772bf1fb0c |
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/* |
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* Copyright © 2011,2012 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-ot-shape-normalize-private.hh" |
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#include "hb-ot-shape-complex-private.hh" |
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#include "hb-ot-shape-private.hh" |
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/* |
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* HIGHLEVEL DESIGN: |
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* |
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* This file exports one main function: _hb_ot_shape_normalize(). |
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* |
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* This function closely reflects the Unicode Normalization Algorithm, |
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* yet it's different. |
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* |
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* Each shaper specifies whether it prefers decomposed (NFD) or composed (NFC). |
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* The logic however tries to use whatever the font can support. |
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* |
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* In general what happens is that: each grapheme is decomposed in a chain |
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* of 1:2 decompositions, marks reordered, and then recomposed if desired, |
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* so far it's like Unicode Normalization. However, the decomposition and |
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* recomposition only happens if the font supports the resulting characters. |
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* |
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* The goals are: |
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* |
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* - Try to render all canonically equivalent strings similarly. To really |
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* achieve this we have to always do the full decomposition and then |
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* selectively recompose from there. It's kinda too expensive though, so |
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* we skip some cases. For example, if composed is desired, we simply |
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* don't touch 1-character clusters that are supported by the font, even |
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* though their NFC may be different. |
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* |
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* - When a font has a precomposed character for a sequence but the 'ccmp' |
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* feature in the font is not adequate, use the precomposed character |
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* which typically has better mark positioning. |
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* |
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* - When a font does not support a combining mark, but supports it precomposed |
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* with previous base, use that. This needs the itemizer to have this |
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* knowledge too. We need to provide assistance to the itemizer. |
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* |
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* - When a font does not support a character but supports its canonical |
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* decomposition, well, use the decomposition. |
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* |
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* - The complex shapers can customize the compose and decompose functions to |
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* offload some of their requirements to the normalizer. For example, the |
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* Indic shaper may want to disallow recomposing of two matras. |
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*/ |
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static bool |
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decompose_unicode (const hb_ot_shape_normalize_context_t *c, |
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hb_codepoint_t ab, |
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hb_codepoint_t *a, |
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hb_codepoint_t *b) |
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{ |
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return (bool) c->unicode->decompose (ab, a, b); |
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} |
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static bool |
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compose_unicode (const hb_ot_shape_normalize_context_t *c, |
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hb_codepoint_t a, |
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hb_codepoint_t b, |
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hb_codepoint_t *ab) |
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{ |
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return (bool) c->unicode->compose (a, b, ab); |
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} |
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static inline void |
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set_glyph (hb_glyph_info_t &info, hb_font_t *font) |
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{ |
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(void) font->get_nominal_glyph (info.codepoint, &info.glyph_index()); |
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} |
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static inline void |
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output_char (hb_buffer_t *buffer, hb_codepoint_t unichar, hb_codepoint_t glyph) |
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{ |
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buffer->cur().glyph_index() = glyph; |
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buffer->output_glyph (unichar); /* This is very confusing indeed. */ |
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_hb_glyph_info_set_unicode_props (&buffer->prev(), buffer); |
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} |
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static inline void |
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next_char (hb_buffer_t *buffer, hb_codepoint_t glyph) |
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{ |
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buffer->cur().glyph_index() = glyph; |
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buffer->next_glyph (); |
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} |
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static inline void |
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skip_char (hb_buffer_t *buffer) |
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{ |
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buffer->skip_glyph (); |
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} |
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/* Returns 0 if didn't decompose, number of resulting characters otherwise. */ |
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static inline unsigned int |
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decompose (const hb_ot_shape_normalize_context_t *c, bool shortest, hb_codepoint_t ab) |
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{ |
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hb_codepoint_t a, b, a_glyph, b_glyph; |
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hb_buffer_t * const buffer = c->buffer; |
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hb_font_t * const font = c->font; |
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if (!c->decompose (c, ab, &a, &b) || |
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(b && !font->get_nominal_glyph (b, &b_glyph))) |
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128 |
return 0; |
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129 |
|
40435 | 130 |
bool has_a = (bool) font->get_nominal_glyph (a, &a_glyph); |
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131 |
if (shortest && has_a) { |
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132 |
/* Output a and b */ |
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133 |
output_char (buffer, a, a_glyph); |
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|
134 |
if (likely (b)) { |
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|
135 |
output_char (buffer, b, b_glyph); |
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|
136 |
return 2; |
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137 |
} |
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|
138 |
return 1; |
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|
139 |
} |
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140 |
|
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141 |
unsigned int ret; |
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142 |
if ((ret = decompose (c, shortest, a))) { |
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|
143 |
if (b) { |
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144 |
output_char (buffer, b, b_glyph); |
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|
145 |
return ret + 1; |
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|
146 |
} |
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|
147 |
return ret; |
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148 |
} |
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149 |
|
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|
150 |
if (has_a) { |
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|
151 |
output_char (buffer, a, a_glyph); |
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|
152 |
if (likely (b)) { |
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|
153 |
output_char (buffer, b, b_glyph); |
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|
154 |
return 2; |
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|
155 |
} |
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|
156 |
return 1; |
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|
157 |
} |
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|
158 |
|
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|
159 |
return 0; |
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|
160 |
} |
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161 |
|
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162 |
static inline void |
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163 |
decompose_current_character (const hb_ot_shape_normalize_context_t *c, bool shortest) |
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164 |
{ |
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165 |
hb_buffer_t * const buffer = c->buffer; |
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166 |
hb_codepoint_t u = buffer->cur().codepoint; |
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167 |
hb_codepoint_t glyph; |
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168 |
|
40435 | 169 |
if (shortest && c->font->get_nominal_glyph (u, &glyph)) |
170 |
{ |
|
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171 |
next_char (buffer, glyph); |
40435 | 172 |
return; |
173 |
} |
|
174 |
||
175 |
if (decompose (c, shortest, u)) |
|
176 |
{ |
|
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177 |
skip_char (buffer); |
40435 | 178 |
return; |
179 |
} |
|
180 |
||
181 |
if (!shortest && c->font->get_nominal_glyph (u, &glyph)) |
|
182 |
{ |
|
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183 |
next_char (buffer, glyph); |
40435 | 184 |
return; |
185 |
} |
|
186 |
||
187 |
if (_hb_glyph_info_is_unicode_space (&buffer->cur())) |
|
188 |
{ |
|
189 |
hb_codepoint_t space_glyph; |
|
190 |
hb_unicode_funcs_t::space_t space_type = buffer->unicode->space_fallback_type (u); |
|
191 |
if (space_type != hb_unicode_funcs_t::NOT_SPACE && c->font->get_nominal_glyph (0x0020u, &space_glyph)) |
|
192 |
{ |
|
193 |
_hb_glyph_info_set_unicode_space_fallback_type (&buffer->cur(), space_type); |
|
194 |
next_char (buffer, space_glyph); |
|
195 |
buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_SPACE_FALLBACK; |
|
196 |
return; |
|
197 |
} |
|
198 |
} |
|
199 |
||
200 |
if (u == 0x2011u) |
|
201 |
{ |
|
202 |
/* U+2011 is the only sensible character that is a no-break version of another character |
|
203 |
* and not a space. The space ones are handled already. Handle this lone one. */ |
|
204 |
hb_codepoint_t other_glyph; |
|
205 |
if (c->font->get_nominal_glyph (0x2010u, &other_glyph)) |
|
206 |
{ |
|
207 |
next_char (buffer, other_glyph); |
|
208 |
return; |
|
209 |
} |
|
210 |
} |
|
211 |
||
212 |
next_char (buffer, glyph); /* glyph is initialized in earlier branches. */ |
|
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213 |
} |
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|
214 |
|
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|
215 |
static inline void |
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|
216 |
handle_variation_selector_cluster (const hb_ot_shape_normalize_context_t *c, unsigned int end, bool short_circuit) |
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|
217 |
{ |
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|
218 |
/* TODO Currently if there's a variation-selector we give-up, it's just too hard. */ |
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|
219 |
hb_buffer_t * const buffer = c->buffer; |
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|
220 |
hb_font_t * const font = c->font; |
40435 | 221 |
for (; buffer->idx < end - 1 && !buffer->in_error;) { |
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|
222 |
if (unlikely (buffer->unicode->is_variation_selector (buffer->cur(+1).codepoint))) { |
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|
223 |
/* The next two lines are some ugly lines... But work. */ |
40435 | 224 |
if (font->get_variation_glyph (buffer->cur().codepoint, buffer->cur(+1).codepoint, &buffer->cur().glyph_index())) |
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|
225 |
{ |
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|
226 |
buffer->replace_glyphs (2, 1, &buffer->cur().codepoint); |
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|
227 |
} |
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|
228 |
else |
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|
229 |
{ |
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|
230 |
/* Just pass on the two characters separately, let GSUB do its magic. */ |
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|
231 |
set_glyph (buffer->cur(), font); |
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|
232 |
buffer->next_glyph (); |
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|
233 |
set_glyph (buffer->cur(), font); |
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|
234 |
buffer->next_glyph (); |
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|
235 |
} |
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|
236 |
/* Skip any further variation selectors. */ |
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|
237 |
while (buffer->idx < end && unlikely (buffer->unicode->is_variation_selector (buffer->cur().codepoint))) |
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|
238 |
{ |
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|
239 |
set_glyph (buffer->cur(), font); |
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|
240 |
buffer->next_glyph (); |
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parents:
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|
241 |
} |
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|
242 |
} else { |
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|
243 |
set_glyph (buffer->cur(), font); |
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|
244 |
buffer->next_glyph (); |
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|
245 |
} |
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|
246 |
} |
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|
247 |
if (likely (buffer->idx < end)) { |
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|
248 |
set_glyph (buffer->cur(), font); |
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parents:
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|
249 |
buffer->next_glyph (); |
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parents:
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|
250 |
} |
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|
251 |
} |
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|
252 |
|
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|
253 |
static inline void |
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|
254 |
decompose_multi_char_cluster (const hb_ot_shape_normalize_context_t *c, unsigned int end, bool short_circuit) |
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|
255 |
{ |
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|
256 |
hb_buffer_t * const buffer = c->buffer; |
40435 | 257 |
for (unsigned int i = buffer->idx; i < end && !buffer->in_error; i++) |
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|
258 |
if (unlikely (buffer->unicode->is_variation_selector (buffer->info[i].codepoint))) { |
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|
259 |
handle_variation_selector_cluster (c, end, short_circuit); |
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parents:
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|
260 |
return; |
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parents:
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changeset
|
261 |
} |
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|
262 |
|
40435 | 263 |
while (buffer->idx < end && !buffer->in_error) |
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|
264 |
decompose_current_character (c, short_circuit); |
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parents:
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|
265 |
} |
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|
266 |
|
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|
267 |
static inline void |
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|
268 |
decompose_cluster (const hb_ot_shape_normalize_context_t *c, unsigned int end, bool might_short_circuit, bool always_short_circuit) |
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|
269 |
{ |
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|
270 |
if (likely (c->buffer->idx + 1 == end)) |
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|
271 |
decompose_current_character (c, might_short_circuit); |
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|
272 |
else |
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|
273 |
decompose_multi_char_cluster (c, end, always_short_circuit); |
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|
274 |
} |
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|
275 |
|
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|
276 |
|
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|
277 |
static int |
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|
278 |
compare_combining_class (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb) |
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|
279 |
{ |
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|
280 |
unsigned int a = _hb_glyph_info_get_modified_combining_class (pa); |
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|
281 |
unsigned int b = _hb_glyph_info_get_modified_combining_class (pb); |
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parents:
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|
282 |
|
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|
283 |
return a < b ? -1 : a == b ? 0 : +1; |
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parents:
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|
284 |
} |
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parents:
diff
changeset
|
285 |
|
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|
286 |
|
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|
287 |
void |
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|
288 |
_hb_ot_shape_normalize (const hb_ot_shape_plan_t *plan, |
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|
289 |
hb_buffer_t *buffer, |
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|
290 |
hb_font_t *font) |
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|
291 |
{ |
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|
292 |
if (unlikely (!buffer->len)) return; |
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|
293 |
|
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|
294 |
_hb_buffer_assert_unicode_vars (buffer); |
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|
295 |
|
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|
296 |
hb_ot_shape_normalization_mode_t mode = plan->shaper->normalization_preference; |
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|
297 |
const hb_ot_shape_normalize_context_t c = { |
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|
298 |
plan, |
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|
299 |
buffer, |
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|
300 |
font, |
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|
301 |
buffer->unicode, |
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|
302 |
plan->shaper->decompose ? plan->shaper->decompose : decompose_unicode, |
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|
303 |
plan->shaper->compose ? plan->shaper->compose : compose_unicode |
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|
304 |
}; |
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|
305 |
|
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|
306 |
bool always_short_circuit = mode == HB_OT_SHAPE_NORMALIZATION_MODE_NONE; |
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|
307 |
bool might_short_circuit = always_short_circuit || |
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|
308 |
(mode != HB_OT_SHAPE_NORMALIZATION_MODE_DECOMPOSED && |
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parents:
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|
309 |
mode != HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT); |
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|
310 |
unsigned int count; |
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|
311 |
|
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|
312 |
/* We do a fairly straightforward yet custom normalization process in three |
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parents:
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|
313 |
* separate rounds: decompose, reorder, recompose (if desired). Currently |
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|
314 |
* this makes two buffer swaps. We can make it faster by moving the last |
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|
315 |
* two rounds into the inner loop for the first round, but it's more readable |
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|
316 |
* this way. */ |
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changeset
|
317 |
|
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changeset
|
318 |
|
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parents:
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|
319 |
/* First round, decompose */ |
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parents:
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|
320 |
|
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parents:
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changeset
|
321 |
buffer->clear_output (); |
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|
322 |
count = buffer->len; |
40435 | 323 |
for (buffer->idx = 0; buffer->idx < count && !buffer->in_error;) |
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|
324 |
{ |
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|
325 |
unsigned int end; |
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parents:
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|
326 |
for (end = buffer->idx + 1; end < count; end++) |
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parents:
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|
327 |
if (likely (!HB_UNICODE_GENERAL_CATEGORY_IS_MARK (_hb_glyph_info_get_general_category (&buffer->info[end])))) |
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parents:
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|
328 |
break; |
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parents:
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changeset
|
329 |
|
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|
330 |
decompose_cluster (&c, end, might_short_circuit, always_short_circuit); |
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parents:
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|
331 |
} |
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parents:
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|
332 |
buffer->swap_buffers (); |
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parents:
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changeset
|
333 |
|
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parents:
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changeset
|
334 |
|
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parents:
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|
335 |
/* Second round, reorder (inplace) */ |
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parents:
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|
336 |
|
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parents:
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|
337 |
count = buffer->len; |
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|
338 |
for (unsigned int i = 0; i < count; i++) |
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|
339 |
{ |
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|
340 |
if (_hb_glyph_info_get_modified_combining_class (&buffer->info[i]) == 0) |
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|
341 |
continue; |
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parents:
diff
changeset
|
342 |
|
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|
343 |
unsigned int end; |
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|
344 |
for (end = i + 1; end < count; end++) |
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|
345 |
if (_hb_glyph_info_get_modified_combining_class (&buffer->info[end]) == 0) |
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parents:
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|
346 |
break; |
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parents:
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|
347 |
|
50352 | 348 |
/* We are going to do a O(n^2). Only do this if the sequence is short. */ |
349 |
if (end - i > HB_OT_SHAPE_COMPLEX_MAX_COMBINING_MARKS) { |
|
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|
350 |
i = end; |
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parents:
diff
changeset
|
351 |
continue; |
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parents:
diff
changeset
|
352 |
} |
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parents:
diff
changeset
|
353 |
|
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parents:
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|
354 |
buffer->sort (i, end, compare_combining_class); |
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diff
changeset
|
355 |
|
48274 | 356 |
if (plan->shaper->reorder_marks) |
357 |
plan->shaper->reorder_marks (plan, buffer, i, end); |
|
358 |
||
34414
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|
359 |
i = end; |
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diff
changeset
|
360 |
} |
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parents:
diff
changeset
|
361 |
|
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prr
parents:
diff
changeset
|
362 |
|
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parents:
diff
changeset
|
363 |
if (mode == HB_OT_SHAPE_NORMALIZATION_MODE_NONE || |
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parents:
diff
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|
364 |
mode == HB_OT_SHAPE_NORMALIZATION_MODE_DECOMPOSED) |
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8143177: Integrate harfbuzz opentype layout engine per JEP 258
prr
parents:
diff
changeset
|
365 |
return; |
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prr
parents:
diff
changeset
|
366 |
|
e496a8d8fc8a
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prr
parents:
diff
changeset
|
367 |
/* Third round, recompose */ |
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parents:
diff
changeset
|
368 |
|
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parents:
diff
changeset
|
369 |
/* As noted in the comment earlier, we don't try to combine |
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parents:
diff
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|
370 |
* ccc=0 chars with their previous Starter. */ |
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parents:
diff
changeset
|
371 |
|
e496a8d8fc8a
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parents:
diff
changeset
|
372 |
buffer->clear_output (); |
e496a8d8fc8a
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parents:
diff
changeset
|
373 |
count = buffer->len; |
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prr
parents:
diff
changeset
|
374 |
unsigned int starter = 0; |
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prr
parents:
diff
changeset
|
375 |
buffer->next_glyph (); |
40435 | 376 |
while (buffer->idx < count && !buffer->in_error) |
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|
377 |
{ |
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parents:
diff
changeset
|
378 |
hb_codepoint_t composed, glyph; |
50352 | 379 |
if (/* We don't try to compose a non-mark character with it's preceding starter. |
34414
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diff
changeset
|
380 |
* This is both an optimization to avoid trying to compose every two neighboring |
e496a8d8fc8a
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parents:
diff
changeset
|
381 |
* glyphs in most scripts AND a desired feature for Hangul. Apparently Hangul |
e496a8d8fc8a
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parents:
diff
changeset
|
382 |
* fonts are not designed to mix-and-match pre-composed syllables and Jamo. */ |
48274 | 383 |
HB_UNICODE_GENERAL_CATEGORY_IS_MARK (_hb_glyph_info_get_general_category (&buffer->cur()))) |
34414
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parents:
diff
changeset
|
384 |
{ |
48274 | 385 |
if (/* If there's anything between the starter and this char, they should have CCC |
386 |
* smaller than this character's. */ |
|
387 |
(starter == buffer->out_len - 1 || |
|
388 |
info_cc (buffer->prev()) < info_cc (buffer->cur())) && |
|
389 |
/* And compose. */ |
|
390 |
c.compose (&c, |
|
391 |
buffer->out_info[starter].codepoint, |
|
392 |
buffer->cur().codepoint, |
|
393 |
&composed) && |
|
394 |
/* And the font has glyph for the composite. */ |
|
395 |
font->get_nominal_glyph (composed, &glyph)) |
|
396 |
{ |
|
397 |
/* Composes. */ |
|
398 |
buffer->next_glyph (); /* Copy to out-buffer. */ |
|
399 |
if (unlikely (buffer->in_error)) |
|
400 |
return; |
|
401 |
buffer->merge_out_clusters (starter, buffer->out_len); |
|
402 |
buffer->out_len--; /* Remove the second composable. */ |
|
403 |
/* Modify starter and carry on. */ |
|
404 |
buffer->out_info[starter].codepoint = composed; |
|
405 |
buffer->out_info[starter].glyph_index() = glyph; |
|
406 |
_hb_glyph_info_set_unicode_props (&buffer->out_info[starter], buffer); |
|
34414
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parents:
diff
changeset
|
407 |
|
48274 | 408 |
continue; |
409 |
} |
|
34414
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parents:
diff
changeset
|
410 |
} |
e496a8d8fc8a
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prr
parents:
diff
changeset
|
411 |
|
e496a8d8fc8a
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prr
parents:
diff
changeset
|
412 |
/* Blocked, or doesn't compose. */ |
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prr
parents:
diff
changeset
|
413 |
buffer->next_glyph (); |
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prr
parents:
diff
changeset
|
414 |
|
48274 | 415 |
if (info_cc (buffer->prev()) == 0) |
34414
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parents:
diff
changeset
|
416 |
starter = buffer->out_len - 1; |
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prr
parents:
diff
changeset
|
417 |
} |
e496a8d8fc8a
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prr
parents:
diff
changeset
|
418 |
buffer->swap_buffers (); |
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prr
parents:
diff
changeset
|
419 |
|
50352 | 420 |
if (buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_CGJ) |
421 |
{ |
|
422 |
/* For all CGJ, check if it prevented any reordering at all. |
|
423 |
* If it did NOT, then make it skippable. |
|
424 |
* https://github.com/harfbuzz/harfbuzz/issues/554 |
|
425 |
*/ |
|
426 |
for (unsigned int i = 1; i + 1 < buffer->len; i++) |
|
427 |
if (buffer->info[i].codepoint == 0x034Fu/*CGJ*/ && |
|
428 |
info_cc(buffer->info[i-1]) <= info_cc(buffer->info[i+1])) |
|
429 |
{ |
|
430 |
_hb_glyph_info_unhide (&buffer->info[i]); |
|
431 |
} |
|
432 |
} |
|
34414
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parents:
diff
changeset
|
433 |
} |