/* | |
* Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies) | |
* | |
* This is part of HarfBuzz, an OpenType Layout engine 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. | |
*/ | |
#include "harfbuzz-shaper.h" | |
#include "harfbuzz-shaper-private.h" | |
#include <assert.h> | |
#ifndef NO_OPENTYPE | |
static const HB_OpenTypeFeature greek_features[] = { | |
{ HB_MAKE_TAG('c', 'c', 'm', 'p'), CcmpProperty }, | |
{ HB_MAKE_TAG('l', 'i', 'g', 'a'), CcmpProperty }, | |
{ HB_MAKE_TAG('c', 'l', 'i', 'g'), CcmpProperty }, | |
{0, 0} | |
}; | |
#endif | |
/* | |
Greek decompositions | |
*/ | |
typedef struct _hb_greek_decomposition { | |
HB_UChar16 composed; | |
HB_UChar16 base; | |
} hb_greek_decomposition; | |
static const hb_greek_decomposition decompose_0x300[] = { | |
{ 0x1FBA, 0x0391 }, | |
{ 0x1FC8, 0x0395 }, | |
{ 0x1FCA, 0x0397 }, | |
{ 0x1FDA, 0x0399 }, | |
{ 0x1FF8, 0x039F }, | |
{ 0x1FEA, 0x03A5 }, | |
{ 0x1FFA, 0x03A9 }, | |
{ 0x1F70, 0x03B1 }, | |
{ 0x1F72, 0x03B5 }, | |
{ 0x1F74, 0x03B7 }, | |
{ 0x1F76, 0x03B9 }, | |
{ 0x1F78, 0x03BF }, | |
{ 0x1F7A, 0x03C5 }, | |
{ 0x1F7C, 0x03C9 }, | |
{ 0x1FD2, 0x03CA }, | |
{ 0x1FE2, 0x03CB }, | |
{ 0x1F02, 0x1F00 }, | |
{ 0, 0 } | |
}; | |
static HB_UChar16 compose_0x300(HB_UChar16 base) | |
{ | |
if ((base ^ 0x1f00) < 0x100) { | |
if (base <= 0x1f69 && !(base & 0x6)) | |
return base + 2; | |
if (base == 0x1fbf) | |
return 0x1fcd; | |
if (base == 0x1ffe) | |
return 0x1fdd; | |
return 0; | |
} | |
{ | |
const hb_greek_decomposition *d = decompose_0x300; | |
while (d->base && d->base != base) | |
++d; | |
return d->composed; | |
} | |
} | |
static const hb_greek_decomposition decompose_0x301[] = { | |
{ 0x0386, 0x0391 }, | |
{ 0x0388, 0x0395 }, | |
{ 0x0389, 0x0397 }, | |
{ 0x038A, 0x0399 }, | |
{ 0x038C, 0x039F }, | |
{ 0x038E, 0x03A5 }, | |
{ 0x038F, 0x03A9 }, | |
{ 0x03AC, 0x03B1 }, | |
{ 0x03AD, 0x03B5 }, | |
{ 0x03AE, 0x03B7 }, | |
{ 0x03AF, 0x03B9 }, | |
{ 0x03CC, 0x03BF }, | |
{ 0x03CD, 0x03C5 }, | |
{ 0x03CE, 0x03C9 }, | |
{ 0x0390, 0x03CA }, | |
{ 0x03B0, 0x03CB }, | |
{ 0x03D3, 0x03D2 }, | |
{ 0, 0 } | |
}; | |
static HB_UChar16 compose_0x301(HB_UChar16 base) | |
{ | |
if ((base ^ 0x1f00) < 0x100) { | |
if (base <= 0x1f69 && !(base & 0x6)) | |
return base + 4; | |
if (base == 0x1fbf) | |
return 0x1fce; | |
if (base == 0x1ffe) | |
return 0x1fde; | |
} | |
{ | |
const hb_greek_decomposition *d = decompose_0x301; | |
while (d->base && d->base != base) | |
++d; | |
return d->composed; | |
} | |
} | |
static const hb_greek_decomposition decompose_0x304[] = { | |
{ 0x1FB9, 0x0391 }, | |
{ 0x1FD9, 0x0399 }, | |
{ 0x1FE9, 0x03A5 }, | |
{ 0x1FB1, 0x03B1 }, | |
{ 0x1FD1, 0x03B9 }, | |
{ 0x1FE1, 0x03C5 }, | |
{ 0, 0 } | |
}; | |
static HB_UChar16 compose_0x304(HB_UChar16 base) | |
{ | |
const hb_greek_decomposition *d = decompose_0x304; | |
while (d->base && d->base != base) | |
++d; | |
return d->composed; | |
} | |
static const hb_greek_decomposition decompose_0x306[] = { | |
{ 0x1FB8, 0x0391 }, | |
{ 0x1FD8, 0x0399 }, | |
{ 0x1FE8, 0x03A5 }, | |
{ 0x1FB0, 0x03B1 }, | |
{ 0x1FD0, 0x03B9 }, | |
{ 0x1FE0, 0x03C5 }, | |
{ 0, 0 } | |
}; | |
static HB_UChar16 compose_0x306(HB_UChar16 base) | |
{ | |
const hb_greek_decomposition *d = decompose_0x306; | |
while (d->base && d->base != base) | |
++d; | |
return d->composed; | |
} | |
static const hb_greek_decomposition decompose_0x308[] = { | |
{ 0x03AA, 0x0399 }, | |
{ 0x03AB, 0x03A5 }, | |
{ 0x03CA, 0x03B9 }, | |
{ 0x03CB, 0x03C5 }, | |
{ 0x03D4, 0x03D2 }, | |
{ 0, 0 } | |
}; | |
static HB_UChar16 compose_0x308(HB_UChar16 base) | |
{ | |
const hb_greek_decomposition *d = decompose_0x308; | |
while (d->base && d->base != base) | |
++d; | |
return d->composed; | |
} | |
static const hb_greek_decomposition decompose_0x313[] = { | |
{ 0x1F08, 0x0391 }, | |
{ 0x1F18, 0x0395 }, | |
{ 0x1F28, 0x0397 }, | |
{ 0x1F38, 0x0399 }, | |
{ 0x1F48, 0x039F }, | |
{ 0x1F68, 0x03A9 }, | |
{ 0x1F00, 0x03B1 }, | |
{ 0x1F10, 0x03B5 }, | |
{ 0x1F20, 0x03B7 }, | |
{ 0x1F30, 0x03B9 }, | |
{ 0x1F40, 0x03BF }, | |
{ 0x1FE4, 0x03C1 }, | |
{ 0x1F50, 0x03C5 }, | |
{ 0x1F60, 0x03C9 }, | |
{ 0, 0 } | |
}; | |
static HB_UChar16 compose_0x313(HB_UChar16 base) | |
{ | |
const hb_greek_decomposition *d = decompose_0x313; | |
while (d->base && d->base != base) | |
++d; | |
return d->composed; | |
} | |
static const hb_greek_decomposition decompose_0x314[] = { | |
{ 0x1F09, 0x0391 }, | |
{ 0x1F19, 0x0395 }, | |
{ 0x1F29, 0x0397 }, | |
{ 0x1F39, 0x0399 }, | |
{ 0x1F49, 0x039F }, | |
{ 0x1FEC, 0x03A1 }, | |
{ 0x1F59, 0x03A5 }, | |
{ 0x1F69, 0x03A9 }, | |
{ 0x1F01, 0x03B1 }, | |
{ 0x1F11, 0x03B5 }, | |
{ 0x1F21, 0x03B7 }, | |
{ 0x1F31, 0x03B9 }, | |
{ 0x1F41, 0x03BF }, | |
{ 0x1FE5, 0x03C1 }, | |
{ 0x1F51, 0x03C5 }, | |
{ 0x1F61, 0x03C9 }, | |
{ 0, 0 } | |
}; | |
static HB_UChar16 compose_0x314(HB_UChar16 base) | |
{ | |
const hb_greek_decomposition *d = decompose_0x314; | |
while (d->base && d->base != base) | |
++d; | |
return d->composed; | |
} | |
static const hb_greek_decomposition decompose_0x342[] = { | |
{ 0x1FB6, 0x03B1 }, | |
{ 0x1FC6, 0x03B7 }, | |
{ 0x1FD6, 0x03B9 }, | |
{ 0x1FE6, 0x03C5 }, | |
{ 0x1FF6, 0x03C9 }, | |
{ 0x1FD7, 0x03CA }, | |
{ 0x1FE7, 0x03CB }, | |
{ 0x1F06, 0x1F00 }, | |
{ 0x1F07, 0x1F01 }, | |
{ 0x1F0E, 0x1F08 }, | |
{ 0x1F0F, 0x1F09 }, | |
{ 0x1F26, 0x1F20 }, | |
{ 0x1F27, 0x1F21 }, | |
{ 0x1F2E, 0x1F28 }, | |
{ 0x1F2F, 0x1F29 }, | |
{ 0x1F36, 0x1F30 }, | |
{ 0x1F37, 0x1F31 }, | |
{ 0x1F3E, 0x1F38 }, | |
{ 0x1F3F, 0x1F39 }, | |
{ 0x1F56, 0x1F50 }, | |
{ 0x1F57, 0x1F51 }, | |
{ 0x1F5F, 0x1F59 }, | |
{ 0x1F66, 0x1F60 }, | |
{ 0x1F67, 0x1F61 }, | |
{ 0x1F6E, 0x1F68 }, | |
{ 0x1F6F, 0x1F69 }, | |
{ 0x1FCF, 0x1FBF }, | |
{ 0x1FDF, 0x1FFE }, | |
{ 0, 0 } | |
}; | |
static HB_UChar16 compose_0x342(HB_UChar16 base) | |
{ | |
const hb_greek_decomposition *d = decompose_0x342; | |
while (d->base && d->base != base) | |
++d; | |
return d->composed; | |
} | |
static const hb_greek_decomposition decompose_0x345[] = { | |
{ 0x1FBC, 0x0391 }, | |
{ 0x1FCC, 0x0397 }, | |
{ 0x1FFC, 0x03A9 }, | |
{ 0x1FB4, 0x03AC }, | |
{ 0x1FC4, 0x03AE }, | |
{ 0x1FB3, 0x03B1 }, | |
{ 0x1FC3, 0x03B7 }, | |
{ 0x1FF3, 0x03C9 }, | |
{ 0x1FF4, 0x03CE }, | |
{ 0x1F80, 0x1F00 }, | |
{ 0x1F81, 0x1F01 }, | |
{ 0x1F82, 0x1F02 }, | |
{ 0x1F83, 0x1F03 }, | |
{ 0x1F84, 0x1F04 }, | |
{ 0x1F85, 0x1F05 }, | |
{ 0x1F86, 0x1F06 }, | |
{ 0x1F87, 0x1F07 }, | |
{ 0x1F88, 0x1F08 }, | |
{ 0x1F89, 0x1F09 }, | |
{ 0x1F8A, 0x1F0A }, | |
{ 0x1F8B, 0x1F0B }, | |
{ 0x1F8C, 0x1F0C }, | |
{ 0x1F8D, 0x1F0D }, | |
{ 0x1F8E, 0x1F0E }, | |
{ 0x1F8F, 0x1F0F }, | |
{ 0x1F90, 0x1F20 }, | |
{ 0x1F91, 0x1F21 }, | |
{ 0x1F92, 0x1F22 }, | |
{ 0x1F93, 0x1F23 }, | |
{ 0x1F94, 0x1F24 }, | |
{ 0x1F95, 0x1F25 }, | |
{ 0x1F96, 0x1F26 }, | |
{ 0x1F97, 0x1F27 }, | |
{ 0x1F98, 0x1F28 }, | |
{ 0x1F99, 0x1F29 }, | |
{ 0x1F9A, 0x1F2A }, | |
{ 0x1F9B, 0x1F2B }, | |
{ 0x1F9C, 0x1F2C }, | |
{ 0x1F9D, 0x1F2D }, | |
{ 0x1F9E, 0x1F2E }, | |
{ 0x1F9F, 0x1F2F }, | |
{ 0x1FA0, 0x1F60 }, | |
{ 0x1FA1, 0x1F61 }, | |
{ 0x1FA2, 0x1F62 }, | |
{ 0x1FA3, 0x1F63 }, | |
{ 0x1FA4, 0x1F64 }, | |
{ 0x1FA5, 0x1F65 }, | |
{ 0x1FA6, 0x1F66 }, | |
{ 0x1FA7, 0x1F67 }, | |
{ 0x1FA8, 0x1F68 }, | |
{ 0x1FA9, 0x1F69 }, | |
{ 0x1FAA, 0x1F6A }, | |
{ 0x1FAB, 0x1F6B }, | |
{ 0x1FAC, 0x1F6C }, | |
{ 0x1FAD, 0x1F6D }, | |
{ 0x1FAE, 0x1F6E }, | |
{ 0x1FAF, 0x1F6F }, | |
{ 0x1FB2, 0x1F70 }, | |
{ 0x1FC2, 0x1F74 }, | |
{ 0x1FF2, 0x1F7C }, | |
{ 0x1FB7, 0x1FB6 }, | |
{ 0x1FC7, 0x1FC6 }, | |
{ 0x1FF7, 0x1FF6 }, | |
{ 0, 0 } | |
}; | |
static HB_UChar16 compose_0x345(HB_UChar16 base) | |
{ | |
const hb_greek_decomposition *d = decompose_0x345; | |
while (d->base && d->base != base) | |
++d; | |
return d->composed; | |
} | |
/* | |
Greek shaping. Heuristic positioning can't render polytonic greek correctly. We're a lot | |
better off mapping greek chars with diacritics to the characters in the extended greek | |
region in Unicode if possible. | |
*/ | |
HB_Bool HB_GreekShape(HB_ShaperItem *shaper_item) | |
{ | |
const int availableGlyphs = shaper_item->num_glyphs; | |
const HB_UChar16 *uc = shaper_item->string + shaper_item->item.pos; | |
unsigned short *logClusters = shaper_item->log_clusters; | |
HB_GlyphAttributes *attributes = shaper_item->attributes; | |
HB_Bool haveGlyphs; | |
int slen = 1; | |
int cluster_start = 0; | |
hb_uint32 i; | |
HB_STACKARRAY(HB_UChar16, shapedChars, 2 * shaper_item->item.length); | |
assert(shaper_item->item.script == HB_Script_Greek); | |
*shapedChars = *uc; | |
logClusters[0] = 0; | |
for (i = 1; i < shaper_item->item.length; ++i) { | |
hb_uint16 base = shapedChars[slen-1]; | |
hb_uint16 shaped = 0; | |
if (uc[i] == 0x300) | |
shaped = compose_0x300(base); | |
else if (uc[i] == 0x301) | |
shaped = compose_0x301(base); | |
else if (uc[i] == 0x304) | |
shaped = compose_0x304(base); | |
else if (uc[i] == 0x306) | |
shaped = compose_0x306(base); | |
else if (uc[i] == 0x308) | |
shaped = compose_0x308(base); | |
else if (uc[i] == 0x313) | |
shaped = compose_0x313(base); | |
else if (uc[i] == 0x314) | |
shaped = compose_0x314(base); | |
else if (uc[i] == 0x342) | |
shaped = compose_0x342(base); | |
else if (uc[i] == 0x345) | |
shaped = compose_0x345(base); | |
if (shaped) { | |
if (shaper_item->font->klass->canRender(shaper_item->font, (HB_UChar16 *)&shaped, 1)) { | |
shapedChars[slen-1] = shaped; | |
} else { | |
shaped = 0; | |
} | |
} | |
if (!shaped) { | |
HB_CharCategory category; | |
int cmb; | |
shapedChars[slen] = uc[i]; | |
HB_GetUnicodeCharProperties(uc[i], &category, &cmb); | |
if (category != HB_Mark_NonSpacing) { | |
attributes[slen].clusterStart = TRUE; | |
attributes[slen].mark = FALSE; | |
attributes[slen].combiningClass = 0; | |
attributes[slen].dontPrint = HB_IsControlChar(uc[i]); | |
cluster_start = slen; | |
} else { | |
attributes[slen].clusterStart = FALSE; | |
attributes[slen].mark = TRUE; | |
attributes[slen].combiningClass = cmb; | |
} | |
++slen; | |
} | |
logClusters[i] = cluster_start; | |
} | |
haveGlyphs = shaper_item->font->klass | |
->convertStringToGlyphIndices(shaper_item->font, | |
shapedChars, slen, | |
shaper_item->glyphs, &shaper_item->num_glyphs, | |
shaper_item->item.bidiLevel % 2); | |
HB_FREE_STACKARRAY(shapedChars); | |
if (!haveGlyphs) | |
return FALSE; | |
#ifndef NO_OPENTYPE | |
if (HB_SelectScript(shaper_item, greek_features)) { | |
HB_OpenTypeShape(shaper_item, /*properties*/0); | |
return HB_OpenTypePosition(shaper_item, availableGlyphs, /*doLogClusters*/TRUE); | |
} | |
#endif | |
HB_HeuristicPosition(shaper_item); | |
return TRUE; | |
} | |