--- /dev/null
+/*
+ * Copyright (C) 2009, Martin Hosken
+ * Copyright (C) 2009, SIL International
+ *
+ * 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.
+ */
+
+#include <graphite/GrClient.h>
+#include <graphite/ITextSource.h>
+#include <graphite/GrData.h>
+#include <graphite/GrConstants.h>
+#include <graphite/Segment.h>
+#include "hb-buffer-private.hh"
+#include "hb-font-private.hh"
+#include "hb-graphite.h"
+#include <map>
+
+namespace TtfUtil
+{
+extern int FontAscent(const void *pOS2);
+extern int FontDescent(const void *pOS2);
+extern int DesignUnits(const void *pHead);
+extern bool FontOs2Style(const void *pOS2, bool &fBold, bool &fItalic);
+}
+
+typedef struct _featureSetting {
+ unsigned int id;
+ int value;
+} featureSetting;
+
+class GrBufferTextSrc : public gr::ITextSource
+{
+public:
+ GrBufferTextSrc(hb_buffer_t *buff, hb_feature_t *feats, unsigned int num_features)
+ {
+ int i;
+ hb_feature_t *aFeat = feats;
+ featureSetting *aNewFeat;
+
+ buffer = hb_buffer_reference(buff);
+ features = new featureSetting[num_features];
+ nFeatures = num_features;
+ aNewFeat = features;
+ for (i = 0; i < num_features; i++, aFeat++, aNewFeat++)
+ {
+ aNewFeat->id = aFeat->tag;
+ aNewFeat->value = aFeat->value;
+ }
+ };
+ ~GrBufferTextSrc() { hb_buffer_destroy(buffer); delete[] features; };
+ virtual gr::UtfType utfEncodingForm() { return gr::kutf32; };
+ virtual size_t getLength() { return buffer->len; };
+ virtual size_t fetch(gr::toffset ichMin, size_t cch, gr::utf32 * prgchBuffer)
+ {
+ int i;
+
+ assert(cch <= buffer->len);
+ if (cch > buffer->len)
+ return 0;
+ for (i = ichMin; i < ichMin + cch; i++)
+ prgchBuffer[i - ichMin] = buffer->info[i].codepoint;
+ return (cch - ichMin);
+ };
+ virtual size_t fetch(gr::toffset ichMin, size_t cch, gr::utf16 * prgchBuffer) { return 0 ;};
+ virtual size_t fetch(gr::toffset ichMin, size_t cch, gr::utf8 * prgchBuffer) { return 0; };
+ virtual bool getRightToLeft(gr::toffset ich)
+ { return hb_buffer_get_direction(buffer) == HB_DIRECTION_RTL; };
+ virtual unsigned int getDirectionDepth(gr::toffset ich)
+ { return hb_buffer_get_direction(buffer) == HB_DIRECTION_RTL ? 1 : 0; };
+ virtual float getVerticalOffset(gr::toffset ich) { return 0; };
+ virtual gr::isocode getLanguage(gr::toffset ich)
+ {
+ gr::isocode aLang;
+ char *p = (char *)(buffer->language);
+ int i;
+ for (i = 0; i < 4; i++)
+ {
+ if (p != NULL)
+ aLang.rgch[i] = *p;
+ else
+ aLang.rgch[i] = 0;
+ if (p && *p)
+ p++;
+ }
+ return aLang;
+ }
+
+ virtual std::pair<gr::toffset, gr::toffset> propertyRange(gr::toffset ich)
+ { return std::pair<gr::toffset, gr::toffset>(0, buffer->len); };
+ virtual size_t getFontFeatures(gr::toffset ich, gr::FeatureSetting * prgfset)
+ {
+ int i;
+ featureSetting *aFeat = features;
+ for (i = 0; i < nFeatures; i++, aFeat++, prgfset++)
+ {
+ prgfset->id = aFeat->id;
+ prgfset->value = aFeat->value;
+ }
+ return nFeatures;
+ }
+ virtual bool sameSegment(gr::toffset ich1, gr::toffset ich2) {return true; };
+
+private:
+ hb_buffer_t *buffer;
+ featureSetting *features;
+ unsigned int nFeatures;
+};
+
+class GrHbFont : public gr::Font
+{
+public:
+ GrHbFont(hb_font_t *font, hb_face_t *face) : gr::Font()
+ { m_font = hb_font_reference(font); m_face = hb_face_reference(face); initfont(); };
+ ~GrHbFont()
+ {
+ std::map<hb_tag_t,hb_blob_t *>::iterator p = m_blobs.begin();
+ while (p != m_blobs.end())
+ { hb_blob_destroy((p++)->second); }
+ hb_font_destroy(m_font);
+ hb_face_destroy(m_face);
+ };
+ GrHbFont (const GrHbFont &font) : gr::Font(font)
+ {
+ *this = font;
+ m_blobs = std::map<hb_tag_t, hb_blob_t *>(font.m_blobs);
+ std::map<hb_tag_t,hb_blob_t *>::iterator p=m_blobs.begin();
+ while (p != m_blobs.end()) { hb_blob_reference((*p++).second); }
+ hb_font_reference(m_font);
+ hb_face_reference(m_face);
+ };
+ virtual GrHbFont *copyThis() { return new GrHbFont(*this); };
+ virtual bool bold() { return m_bold; };
+ virtual bool italic() { return m_italic; };
+ virtual float ascent() { float asc; getFontMetrics(&asc, NULL, NULL); return asc; };
+ virtual float descent() { float desc; getFontMetrics(NULL, &desc, NULL); return desc; };
+ virtual float height()
+ { float asc, desc; getFontMetrics(&asc, &desc, NULL); return (asc + desc); };
+ virtual unsigned int getDPIx() { return m_font->x_ppem; };
+ virtual unsigned int getDPIy() { return m_font->y_ppem; };
+ virtual const void *getTable(gr::fontTableId32 tableID, size_t *pcbsize)
+ {
+ hb_blob_t *blob;
+ std::map<hb_tag_t,hb_blob_t *>::iterator p=m_blobs.find((hb_tag_t)tableID);
+ if (p == m_blobs.end())
+ {
+ blob = hb_face_get_table(m_face, (hb_tag_t)tableID);
+ m_blobs[(hb_tag_t)tableID] = blob;
+ }
+ else
+ { blob = p->second; }
+
+ const char *res = hb_blob_lock(blob);
+ if (pcbsize)
+ *pcbsize = hb_blob_get_length(blob);
+ hb_blob_unlock(blob);
+ return (const void *)res;
+ }
+
+ virtual void getFontMetrics(float *pAscent, float *pDescent, float *pEmSquare)
+ {
+ if (pAscent) *pAscent = 1. * m_ascent * m_font->y_ppem / m_emsquare;
+ if (pDescent) *pDescent = 1. * m_descent * m_font->y_ppem / m_emsquare;
+ if (pEmSquare) *pEmSquare = m_font->x_scale;
+ }
+ virtual void getGlyphPoint(gr::gid16 glyphID, unsigned int pointNum, gr::Point &pointReturn)
+ {
+ hb_position_t x, y;
+ hb_font_get_contour_point(m_font, m_face, pointNum, glyphID, &x, &y);
+ pointReturn.x = (float)x;
+ pointReturn.y = (float)y;
+ }
+
+ virtual void getGlyphMetrics(gr::gid16 glyphID, gr::Rect &boundingBox, gr::Point &advances)
+ {
+ hb_glyph_metrics_t metrics;
+ hb_font_get_glyph_metrics(m_font, m_face, glyphID, &metrics);
+ boundingBox.top = (metrics.y_offset + metrics.height);
+ boundingBox.bottom = metrics.y_offset;
+ boundingBox.left = metrics.x_offset;
+ boundingBox.right = (metrics.x_offset + metrics.width);
+ advances.x = metrics.x_advance;
+ advances.y = metrics.y_advance;
+// 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);
+ }
+
+private:
+ void initfont();
+
+ hb_font_t *m_font;
+ hb_face_t *m_face;
+ float m_ascent;
+ float m_descent;
+ float m_emsquare;
+ bool m_bold;
+ bool m_italic;
+ std::map<hb_tag_t, hb_blob_t *> m_blobs;
+};
+
+void GrHbFont::initfont()
+{
+ const void *pOS2 = getTable(gr::kttiOs2, NULL);
+ const void *pHead = getTable(gr::kttiHead, NULL);
+ TtfUtil::FontOs2Style(pOS2, m_bold, m_italic);
+ m_ascent = static_cast<float>(TtfUtil::FontAscent(pOS2));
+ m_descent = static_cast<float>(TtfUtil::FontDescent(pOS2));
+ m_emsquare = static_cast<float>(TtfUtil::DesignUnits(pHead));
+}
+
+void
+hb_graphite_shape (hb_font_t *font,
+ hb_face_t *face,
+ hb_buffer_t *buffer,
+ hb_feature_t *features,
+ unsigned int num_features)
+{
+ /* create text source */
+ GrBufferTextSrc textSrc(buffer, features, num_features);
+
+ /* create grfont */
+ GrHbFont grfont(font, face);
+
+ /* create segment */
+ int *firsts;
+ bool *flags;
+ int numChars;
+ int numGlyphs;
+ gr::LayoutEnvironment layout;
+ std::pair<gr::GlyphIterator, gr::GlyphIterator>glyph_range;
+ gr::GlyphIterator iGlyph;
+ hb_codepoint_t *glyph_infos, *pGlyph;
+ hb_glyph_position_t *pPosition;
+ int cGlyph = 0;
+ int cChar = 0;
+
+ layout.setStartOfLine(0);
+ layout.setEndOfLine(0);
+ layout.setDumbFallback(true);
+ layout.setJustifier(NULL);
+ layout.setRightToLeft(false);
+
+ gr::RangeSegment pSegment(&grfont, &textSrc, &layout, (gr::toffset)0,
+ static_cast<gr::toffset>(buffer->len), (gr::Segment *)NULL);
+
+ /* fill in buffer from segment */
+ _hb_buffer_clear_output(buffer);
+ pSegment.getUniscribeClusters(NULL, 0, &numChars, NULL, 0, &numGlyphs);
+ firsts = new int[numChars];
+ flags = new bool[numGlyphs];
+ glyph_infos = new hb_codepoint_t[numGlyphs];
+ hb_buffer_ensure(buffer, numGlyphs);
+ pSegment.getUniscribeClusters(firsts, numChars, NULL, flags, numGlyphs, NULL);
+ glyph_range = pSegment.glyphs();
+ for (pGlyph = glyph_infos, iGlyph = glyph_range.first; iGlyph != glyph_range.second;
+ iGlyph++, pGlyph++)
+ { *pGlyph = iGlyph->glyphID(); }
+
+ while (cGlyph < numGlyphs)
+ {
+ if (flags[cGlyph])
+ {
+ int oldcChar = cChar++;
+ int oldcGlyph = cGlyph++;
+ while (cChar < numChars && firsts[cChar] == firsts[oldcChar]) cChar++;
+ while (cGlyph < numGlyphs && !flags[cGlyph]) cGlyph++;
+ _hb_buffer_add_output_glyphs(buffer, cChar - oldcChar, cGlyph - oldcGlyph,
+ glyph_infos + oldcGlyph, 0xFFFF, 0xFFFF);
+ }
+ else
+ { cGlyph++; } /* This should never happen */
+ }
+
+ float curradvx = 0., curradvy = 0.;
+ for (pPosition = hb_buffer_get_glyph_positions(buffer), iGlyph = glyph_range.first;
+ iGlyph != glyph_range.second; pPosition++, iGlyph++)
+ {
+ pPosition->x_offset = iGlyph->origin() - curradvx;
+ pPosition->y_offset = iGlyph->yOffset() - curradvy;
+ pPosition->x_advance = pPosition->x_offset + iGlyph->advanceWidth();
+ pPosition->y_advance = pPosition->y_offset + iGlyph->advanceHeight();
+// if (pPosition->x_advance < 0)
+// pPosition->x_advance = 0;
+ curradvx += pPosition->x_advance;
+ curradvy += pPosition->y_advance;
+// fprintf(stderr, "%d@(%f, %f)+(%f, %f)\n", iGlyph->glyphID(), iGlyph->origin(), iGlyph->yOffset(), iGlyph->advanceWidth(), iGlyph->advanceHeight());
+ }
+
+ delete[] glyph_infos;
+ delete[] firsts;
+ delete[] flags;
+}
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