156 lines
4.5 KiB
C++
156 lines
4.5 KiB
C++
// SPDX-License-Identifier: MIT
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// Copyright 2010, SIL International, All rights reserved.
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#include "graphite2/Segment.h"
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#include "inc/UtfCodec.h"
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#include "inc/Segment.h"
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#include "inc/Font.h"
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using namespace graphite2;
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namespace
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{
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gr_segment* makeAndInitialize(const Font *font, const Face *face, uint32_t script, const Features* pFeats/*must not be NULL*/, gr_encform enc, const void* pStart, size_t nChars, int dir)
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{
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if (script == 0x20202020) script = 0;
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else if ((script & 0x00FFFFFF) == 0x00202020) script = script & 0xFF000000;
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else if ((script & 0x0000FFFF) == 0x00002020) script = script & 0xFFFF0000;
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else if ((script & 0x000000FF) == 0x00000020) script = script & 0xFFFFFF00;
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// if (!font) return NULL;
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Segment* pRes=new Segment(nChars, face, script, dir);
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if (!pRes->read_text(face, pFeats, enc, pStart, nChars) || !pRes->runGraphite())
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{
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delete pRes;
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return NULL;
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}
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pRes->finalise(font, true);
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return static_cast<gr_segment*>(pRes);
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}
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template <typename utf_iter>
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inline size_t count_unicode_chars(utf_iter first, const utf_iter last, const void **error)
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{
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size_t n_chars = 0;
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uint32_t usv = 0;
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if (last)
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{
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if (!first.validate(last))
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{
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if (error) *error = last - 1;
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return 0;
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}
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for (;first != last; ++first, ++n_chars)
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if ((usv = *first) == 0 || first.error()) break;
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}
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else
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{
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while ((usv = *first) != 0 && !first.error())
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{
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++first;
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++n_chars;
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}
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}
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if (error) *error = first.error() ? first : 0;
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return n_chars;
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}
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}
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extern "C" {
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size_t gr_count_unicode_characters(gr_encform enc, const void* buffer_begin, const void* buffer_end/*don't go on or past end, If NULL then ignored*/, const void** pError) //Also stops on nul. Any nul is not in the count
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{
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assert(buffer_begin);
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switch (enc)
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{
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case gr_utf8: return count_unicode_chars<utf8::const_iterator>(buffer_begin, buffer_end, pError); break;
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case gr_utf16: return count_unicode_chars<utf16::const_iterator>(buffer_begin, buffer_end, pError); break;
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case gr_utf32: return count_unicode_chars<utf32::const_iterator>(buffer_begin, buffer_end, pError); break;
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default: return 0;
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}
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}
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gr_segment* gr_make_seg(const gr_font *font, const gr_face *face, uint32_t script, const gr_feature_val* pFeats, gr_encform enc, const void* pStart, size_t nChars, int dir)
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{
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if (!face) return nullptr;
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const gr_feature_val * tmp_feats = 0;
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if (pFeats == 0)
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pFeats = tmp_feats = static_cast<const gr_feature_val*>(face->theSill().cloneFeatures(0));
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gr_segment * seg = makeAndInitialize(font, face, script, pFeats, enc, pStart, nChars, dir);
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delete static_cast<const FeatureVal*>(tmp_feats);
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return seg;
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}
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void gr_seg_destroy(gr_segment* p)
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{
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delete static_cast<Segment*>(p);
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}
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float gr_seg_advance_X(const gr_segment* pSeg/*not NULL*/)
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{
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assert(pSeg);
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return pSeg->advance().x;
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}
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float gr_seg_advance_Y(const gr_segment* pSeg/*not NULL*/)
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{
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assert(pSeg);
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return pSeg->advance().y;
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}
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unsigned int gr_seg_n_cinfo(const gr_segment* pSeg/*not NULL*/)
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{
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assert(pSeg);
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return static_cast<unsigned int>(pSeg->charInfoCount());
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}
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const gr_char_info* gr_seg_cinfo(const gr_segment* pSeg/*not NULL*/, unsigned int index/*must be <number_of_CharInfo*/)
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{
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assert(pSeg);
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return static_cast<const gr_char_info*>(pSeg->charinfo(index));
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}
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unsigned int gr_seg_n_slots(const gr_segment* pSeg/*not NULL*/)
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{
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assert(pSeg);
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return static_cast<unsigned int>(pSeg->slotCount());
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}
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const gr_slot* gr_seg_first_slot(gr_segment* pSeg/*not NULL*/)
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{
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assert(pSeg);
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return pSeg->slots().begin().handle();
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}
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const gr_slot* gr_seg_last_slot(gr_segment* pSeg/*not NULL*/)
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{
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assert(pSeg);
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return (--pSeg->slots().end()).handle();
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}
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float gr_seg_justify(gr_segment* pSeg/*not NULL*/, const gr_slot* pSlot/*not NULL*/, const gr_font *pFont, double width, enum gr_justFlags flags, const gr_slot *pFirst, const gr_slot *pLast)
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{
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assert(pSeg);
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assert(pSlot);
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auto const first = pFirst == nullptr ? pSeg->slots().begin() : const_cast<gr_slot *>(pFirst),
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last = pLast == nullptr ? pSeg->slots().end() : ++SlotBuffer::iterator(const_cast<gr_slot *>(pLast));
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return pSeg->justify(const_cast<gr_slot *>(pSlot), pFont, float(width), justFlags(flags), first, last);
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}
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} // extern "C"
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