Import Graphite shaping backend by Martin Hosken
This commit is contained in:
Behdad Esfahbod
parent
3ba6818ba9
commit
305ba86715
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@ -33,6 +33,12 @@ if $have_icu; then
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fi
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AM_CONDITIONAL(HAVE_ICU, $have_icu)
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PKG_CHECK_MODULES(GRAPHITE, silgraphite, have_graphite=true, have_graphite=false)
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if $have_graphite; then
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AC_DEFINE(HAVE_GRAPHITE, 1, [Have Graphite library])
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fi
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AM_CONDITIONAL(HAVE_GRAPHITE, $have_graphite)
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PKG_CHECK_MODULES(FREETYPE, freetype2, have_freetype=true, have_freetype=false)
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if $have_freetype; then
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AC_DEFINE(HAVE_FREETYPE, 1, [Have FreeType 2 library])
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@ -89,6 +89,17 @@ HBHEADERS += \
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$(NULL)
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endif
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if HAVE_GRAPHITE
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HBCFLAGS += $(GRAPHITE_CFLAGS)
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HBLIBS += $(GRAPHITE_LIBS)
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HBSOURCES += \
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hb-graphite.cc \
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$(NULL)
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HBHEADERS += \
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hb-graphite.h \
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$(NULL)
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endif
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CXXLINK = $(LINK)
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libharfbuzz_la_SOURCES = $(HBSOURCES) $(HBHEADERS)
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libharfbuzz_la_CPPFLAGS = $(HBCFLAGS)
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@ -0,0 +1,308 @@
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/*
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* Copyright (C) 2009, Martin Hosken
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* Copyright (C) 2009, SIL International
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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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#include <graphite/GrClient.h>
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#include <graphite/ITextSource.h>
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#include <graphite/GrData.h>
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#include <graphite/GrConstants.h>
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#include <graphite/Segment.h>
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#include "hb-buffer-private.hh"
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#include "hb-font-private.hh"
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#include "hb-graphite.h"
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#include <map>
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namespace TtfUtil
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{
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extern int FontAscent(const void *pOS2);
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extern int FontDescent(const void *pOS2);
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extern int DesignUnits(const void *pHead);
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extern bool FontOs2Style(const void *pOS2, bool &fBold, bool &fItalic);
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}
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typedef struct _featureSetting {
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unsigned int id;
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int value;
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} featureSetting;
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class GrBufferTextSrc : public gr::ITextSource
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{
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public:
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GrBufferTextSrc(hb_buffer_t *buff, hb_feature_t *feats, unsigned int num_features)
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{
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int i;
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hb_feature_t *aFeat = feats;
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featureSetting *aNewFeat;
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buffer = hb_buffer_reference(buff);
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features = new featureSetting[num_features];
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nFeatures = num_features;
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aNewFeat = features;
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for (i = 0; i < num_features; i++, aFeat++, aNewFeat++)
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{
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aNewFeat->id = aFeat->tag;
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aNewFeat->value = aFeat->value;
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}
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};
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~GrBufferTextSrc() { hb_buffer_destroy(buffer); delete[] features; };
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virtual gr::UtfType utfEncodingForm() { return gr::kutf32; };
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virtual size_t getLength() { return buffer->len; };
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virtual size_t fetch(gr::toffset ichMin, size_t cch, gr::utf32 * prgchBuffer)
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{
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int i;
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assert(cch <= buffer->len);
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if (cch > buffer->len)
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return 0;
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for (i = ichMin; i < ichMin + cch; i++)
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prgchBuffer[i - ichMin] = buffer->info[i].codepoint;
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return (cch - ichMin);
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};
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virtual size_t fetch(gr::toffset ichMin, size_t cch, gr::utf16 * prgchBuffer) { return 0 ;};
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virtual size_t fetch(gr::toffset ichMin, size_t cch, gr::utf8 * prgchBuffer) { return 0; };
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virtual bool getRightToLeft(gr::toffset ich)
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{ return hb_buffer_get_direction(buffer) == HB_DIRECTION_RTL; };
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virtual unsigned int getDirectionDepth(gr::toffset ich)
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{ return hb_buffer_get_direction(buffer) == HB_DIRECTION_RTL ? 1 : 0; };
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virtual float getVerticalOffset(gr::toffset ich) { return 0; };
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virtual gr::isocode getLanguage(gr::toffset ich)
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{
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gr::isocode aLang;
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char *p = (char *)(buffer->language);
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int i;
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for (i = 0; i < 4; i++)
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{
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if (p != NULL)
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aLang.rgch[i] = *p;
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else
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aLang.rgch[i] = 0;
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if (p && *p)
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p++;
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}
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return aLang;
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}
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virtual std::pair<gr::toffset, gr::toffset> propertyRange(gr::toffset ich)
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{ return std::pair<gr::toffset, gr::toffset>(0, buffer->len); };
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virtual size_t getFontFeatures(gr::toffset ich, gr::FeatureSetting * prgfset)
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{
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int i;
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featureSetting *aFeat = features;
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for (i = 0; i < nFeatures; i++, aFeat++, prgfset++)
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{
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prgfset->id = aFeat->id;
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prgfset->value = aFeat->value;
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}
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return nFeatures;
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}
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virtual bool sameSegment(gr::toffset ich1, gr::toffset ich2) {return true; };
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private:
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hb_buffer_t *buffer;
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featureSetting *features;
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unsigned int nFeatures;
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};
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class GrHbFont : public gr::Font
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{
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public:
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GrHbFont(hb_font_t *font, hb_face_t *face) : gr::Font()
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{ m_font = hb_font_reference(font); m_face = hb_face_reference(face); initfont(); };
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~GrHbFont()
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{
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std::map<hb_tag_t,hb_blob_t *>::iterator p = m_blobs.begin();
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while (p != m_blobs.end())
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{ hb_blob_destroy((p++)->second); }
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hb_font_destroy(m_font);
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hb_face_destroy(m_face);
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};
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GrHbFont (const GrHbFont &font) : gr::Font(font)
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{
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*this = font;
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m_blobs = std::map<hb_tag_t, hb_blob_t *>(font.m_blobs);
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std::map<hb_tag_t,hb_blob_t *>::iterator p=m_blobs.begin();
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while (p != m_blobs.end()) { hb_blob_reference((*p++).second); }
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hb_font_reference(m_font);
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hb_face_reference(m_face);
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};
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virtual GrHbFont *copyThis() { return new GrHbFont(*this); };
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virtual bool bold() { return m_bold; };
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virtual bool italic() { return m_italic; };
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virtual float ascent() { float asc; getFontMetrics(&asc, NULL, NULL); return asc; };
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virtual float descent() { float desc; getFontMetrics(NULL, &desc, NULL); return desc; };
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virtual float height()
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{ float asc, desc; getFontMetrics(&asc, &desc, NULL); return (asc + desc); };
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virtual unsigned int getDPIx() { return m_font->x_ppem; };
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virtual unsigned int getDPIy() { return m_font->y_ppem; };
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virtual const void *getTable(gr::fontTableId32 tableID, size_t *pcbsize)
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{
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hb_blob_t *blob;
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std::map<hb_tag_t,hb_blob_t *>::iterator p=m_blobs.find((hb_tag_t)tableID);
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if (p == m_blobs.end())
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{
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blob = hb_face_get_table(m_face, (hb_tag_t)tableID);
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m_blobs[(hb_tag_t)tableID] = blob;
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}
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else
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{ blob = p->second; }
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const char *res = hb_blob_lock(blob);
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if (pcbsize)
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*pcbsize = hb_blob_get_length(blob);
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hb_blob_unlock(blob);
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return (const void *)res;
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}
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virtual void getFontMetrics(float *pAscent, float *pDescent, float *pEmSquare)
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{
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if (pAscent) *pAscent = 1. * m_ascent * m_font->y_ppem / m_emsquare;
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if (pDescent) *pDescent = 1. * m_descent * m_font->y_ppem / m_emsquare;
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if (pEmSquare) *pEmSquare = m_font->x_scale;
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}
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virtual void getGlyphPoint(gr::gid16 glyphID, unsigned int pointNum, gr::Point &pointReturn)
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{
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hb_position_t x, y;
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hb_font_get_contour_point(m_font, m_face, pointNum, glyphID, &x, &y);
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pointReturn.x = (float)x;
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pointReturn.y = (float)y;
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}
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virtual void getGlyphMetrics(gr::gid16 glyphID, gr::Rect &boundingBox, gr::Point &advances)
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{
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hb_glyph_metrics_t metrics;
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hb_font_get_glyph_metrics(m_font, m_face, glyphID, &metrics);
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boundingBox.top = (metrics.y_offset + metrics.height);
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boundingBox.bottom = metrics.y_offset;
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boundingBox.left = metrics.x_offset;
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boundingBox.right = (metrics.x_offset + metrics.width);
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advances.x = metrics.x_advance;
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advances.y = metrics.y_advance;
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// fprintf (stderr, "%d: (%d, %d, %d, %d)+(%d, %d)\n", glyphID, metrics.x_offset, metrics.y_offset, metrics.width, metrics.height, metrics.x_advance, metrics.y_advance);
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}
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private:
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void initfont();
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hb_font_t *m_font;
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hb_face_t *m_face;
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float m_ascent;
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float m_descent;
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float m_emsquare;
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bool m_bold;
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bool m_italic;
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std::map<hb_tag_t, hb_blob_t *> m_blobs;
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};
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void GrHbFont::initfont()
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{
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const void *pOS2 = getTable(gr::kttiOs2, NULL);
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const void *pHead = getTable(gr::kttiHead, NULL);
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TtfUtil::FontOs2Style(pOS2, m_bold, m_italic);
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m_ascent = static_cast<float>(TtfUtil::FontAscent(pOS2));
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m_descent = static_cast<float>(TtfUtil::FontDescent(pOS2));
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m_emsquare = static_cast<float>(TtfUtil::DesignUnits(pHead));
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}
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void
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hb_graphite_shape (hb_font_t *font,
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hb_face_t *face,
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hb_buffer_t *buffer,
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hb_feature_t *features,
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unsigned int num_features)
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{
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/* create text source */
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GrBufferTextSrc textSrc(buffer, features, num_features);
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/* create grfont */
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GrHbFont grfont(font, face);
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/* create segment */
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int *firsts;
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bool *flags;
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int numChars;
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int numGlyphs;
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gr::LayoutEnvironment layout;
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std::pair<gr::GlyphIterator, gr::GlyphIterator>glyph_range;
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gr::GlyphIterator iGlyph;
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hb_codepoint_t *glyph_infos, *pGlyph;
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hb_glyph_position_t *pPosition;
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int cGlyph = 0;
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int cChar = 0;
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layout.setStartOfLine(0);
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layout.setEndOfLine(0);
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layout.setDumbFallback(true);
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layout.setJustifier(NULL);
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layout.setRightToLeft(false);
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gr::RangeSegment pSegment(&grfont, &textSrc, &layout, (gr::toffset)0,
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static_cast<gr::toffset>(buffer->len), (gr::Segment *)NULL);
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/* fill in buffer from segment */
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_hb_buffer_clear_output(buffer);
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pSegment.getUniscribeClusters(NULL, 0, &numChars, NULL, 0, &numGlyphs);
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firsts = new int[numChars];
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flags = new bool[numGlyphs];
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glyph_infos = new hb_codepoint_t[numGlyphs];
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hb_buffer_ensure(buffer, numGlyphs);
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pSegment.getUniscribeClusters(firsts, numChars, NULL, flags, numGlyphs, NULL);
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glyph_range = pSegment.glyphs();
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for (pGlyph = glyph_infos, iGlyph = glyph_range.first; iGlyph != glyph_range.second;
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iGlyph++, pGlyph++)
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{ *pGlyph = iGlyph->glyphID(); }
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while (cGlyph < numGlyphs)
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{
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if (flags[cGlyph])
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{
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int oldcChar = cChar++;
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int oldcGlyph = cGlyph++;
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while (cChar < numChars && firsts[cChar] == firsts[oldcChar]) cChar++;
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while (cGlyph < numGlyphs && !flags[cGlyph]) cGlyph++;
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_hb_buffer_add_output_glyphs(buffer, cChar - oldcChar, cGlyph - oldcGlyph,
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glyph_infos + oldcGlyph, 0xFFFF, 0xFFFF);
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}
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else
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{ cGlyph++; } /* This should never happen */
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}
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float curradvx = 0., curradvy = 0.;
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for (pPosition = hb_buffer_get_glyph_positions(buffer), iGlyph = glyph_range.first;
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iGlyph != glyph_range.second; pPosition++, iGlyph++)
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{
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pPosition->x_offset = iGlyph->origin() - curradvx;
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pPosition->y_offset = iGlyph->yOffset() - curradvy;
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pPosition->x_advance = pPosition->x_offset + iGlyph->advanceWidth();
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pPosition->y_advance = pPosition->y_offset + iGlyph->advanceHeight();
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// if (pPosition->x_advance < 0)
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// pPosition->x_advance = 0;
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curradvx += pPosition->x_advance;
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curradvy += pPosition->y_advance;
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// fprintf(stderr, "%d@(%f, %f)+(%f, %f)\n", iGlyph->glyphID(), iGlyph->origin(), iGlyph->yOffset(), iGlyph->advanceWidth(), iGlyph->advanceHeight());
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}
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delete[] glyph_infos;
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delete[] firsts;
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delete[] flags;
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}
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@ -0,0 +1,46 @@
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/*
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* Copyright (C) 2009, Martin Hosken
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* Copyright (C) 2009, SIL International
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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
|
||||
* 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.
|
||||
*
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* Red Hat Author(s): Behdad Esfahbod
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*/
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#ifndef HB_GRAPHITE_H
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#define HB_GRAPHITE_H
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#include "hb-shape.h"
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HB_BEGIN_DECLS
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#define HB_GRAPHITE_TAG_Silf HB_TAG('S','i','l','f')
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void hb_graphite_shape (hb_font_t *font,
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hb_face_t *face,
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hb_buffer_t *buffer,
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hb_feature_t *features,
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unsigned int num_features);
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HB_END_DECLS
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#endif /* HB_GRAPHITE_H */
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@ -32,6 +32,9 @@
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#include "hb-ot-shape-private.hh"
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#ifdef HAVE_GRAPHITE
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#include "hb-graphite.h"
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#endif
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/* Prepare */
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@ -220,6 +223,18 @@ hb_shape (hb_font_t *font,
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hb_direction_t original_direction;
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hb_bool_t substitute_fallback, position_fallback;
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#ifdef HAVE_GRAPHITE
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hb_blob_t *silf_blob;
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silf_blob = hb_face_get_table (face, HB_GRAPHITE_TAG_Silf);
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if (hb_blob_get_length(silf_blob))
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{
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hb_graphite_shape(font, face, buffer, features, num_features);
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hb_blob_destroy(silf_blob);
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return;
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}
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hb_blob_destroy(silf_blob);
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#endif
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hb_form_clusters (buffer);
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hb_substitute_default (font, face, buffer, features, num_features);
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