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+/*
+ * Copyright (C) 2008 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.
+ */
+
+#ifndef HARFBUZZ_SHAPER_H
+#define HARFBUZZ_SHAPER_H
+
+#include "harfbuzz-global.h"
+#include "harfbuzz-gdef.h"
+#include "harfbuzz-gpos.h"
+#include "harfbuzz-gsub.h"
+#include "harfbuzz-external.h"
+#include "harfbuzz-stream-private.h"
+
+HB_BEGIN_HEADER
+
+typedef enum {
+ HB_Script_Common,
+ HB_Script_Greek,
+ HB_Script_Cyrillic,
+ HB_Script_Armenian,
+ HB_Script_Hebrew,
+ HB_Script_Arabic,
+ HB_Script_Syriac,
+ HB_Script_Thaana,
+ HB_Script_Devanagari,
+ HB_Script_Bengali,
+ HB_Script_Gurmukhi,
+ HB_Script_Gujarati,
+ HB_Script_Oriya,
+ HB_Script_Tamil,
+ HB_Script_Telugu,
+ HB_Script_Kannada,
+ HB_Script_Malayalam,
+ HB_Script_Sinhala,
+ HB_Script_Thai,
+ HB_Script_Lao,
+ HB_Script_Tibetan,
+ HB_Script_Myanmar,
+ HB_Script_Georgian,
+ HB_Script_Hangul,
+ HB_Script_Ogham,
+ HB_Script_Runic,
+ HB_Script_Khmer,
+ HB_Script_Inherited,
+ HB_ScriptCount = HB_Script_Inherited
+ /*
+ HB_Script_Latin = Common,
+ HB_Script_Ethiopic = Common,
+ HB_Script_Cherokee = Common,
+ HB_Script_CanadianAboriginal = Common,
+ HB_Script_Mongolian = Common,
+ HB_Script_Hiragana = Common,
+ HB_Script_Katakana = Common,
+ HB_Script_Bopomofo = Common,
+ HB_Script_Han = Common,
+ HB_Script_Yi = Common,
+ HB_Script_OldItalic = Common,
+ HB_Script_Gothic = Common,
+ HB_Script_Deseret = Common,
+ HB_Script_Tagalog = Common,
+ HB_Script_Hanunoo = Common,
+ HB_Script_Buhid = Common,
+ HB_Script_Tagbanwa = Common,
+ HB_Script_Limbu = Common,
+ HB_Script_TaiLe = Common,
+ HB_Script_LinearB = Common,
+ HB_Script_Ugaritic = Common,
+ HB_Script_Shavian = Common,
+ HB_Script_Osmanya = Common,
+ HB_Script_Cypriot = Common,
+ HB_Script_Braille = Common,
+ HB_Script_Buginese = Common,
+ HB_Script_Coptic = Common,
+ HB_Script_NewTaiLue = Common,
+ HB_Script_Glagolitic = Common,
+ HB_Script_Tifinagh = Common,
+ HB_Script_SylotiNagri = Common,
+ HB_Script_OldPersian = Common,
+ HB_Script_Kharoshthi = Common,
+ HB_Script_Balinese = Common,
+ HB_Script_Cuneiform = Common,
+ HB_Script_Phoenician = Common,
+ HB_Script_PhagsPa = Common,
+ HB_Script_Nko = Common
+ */
+} HB_Script;
+
+typedef struct
+{
+ hb_uint32 pos;
+ hb_uint32 length;
+ HB_Script script;
+ hb_uint8 bidiLevel;
+} HB_ScriptItem;
+
+typedef enum {
+ HB_NoBreak,
+ HB_SoftHyphen,
+ HB_Break,
+ HB_ForcedBreak
+} HB_LineBreakType;
+
+
+typedef struct {
+ /*HB_LineBreakType*/ unsigned lineBreakType :2;
+ /*HB_Bool*/ unsigned whiteSpace :1; /* A unicode whitespace character, except NBSP, ZWNBSP */
+ /*HB_Bool*/ unsigned charStop :1; /* Valid cursor position (for left/right arrow) */
+ /*HB_Bool*/ unsigned wordBoundary :1;
+ /*HB_Bool*/ unsigned sentenceBoundary :1;
+ unsigned unused :2;
+} HB_CharAttributes;
+
+void HB_GetCharAttributes(const HB_UChar16 *string, hb_uint32 stringLength,
+ const HB_ScriptItem *items, hb_uint32 numItems,
+ HB_CharAttributes *attributes);
+
+/* requires HB_GetCharAttributes to be called before */
+void HB_GetWordBoundaries(const HB_UChar16 *string, hb_uint32 stringLength,
+ const HB_ScriptItem *items, hb_uint32 numItems,
+ HB_CharAttributes *attributes);
+
+/* requires HB_GetCharAttributes to be called before */
+void HB_GetSentenceBoundaries(const HB_UChar16 *string, hb_uint32 stringLength,
+ const HB_ScriptItem *items, hb_uint32 numItems,
+ HB_CharAttributes *attributes);
+
+
+typedef enum {
+ HB_LeftToRight = 0,
+ HB_RightToLeft = 1
+} HB_StringToGlyphsFlags;
+
+typedef enum {
+ HB_ShaperFlag_Default = 0,
+ HB_ShaperFlag_NoKerning = 1,
+ HB_ShaperFlag_UseDesignMetrics = 2
+} HB_ShaperFlag;
+
+/*
+ highest value means highest priority for justification. Justification is done by first inserting kashidas
+ starting with the highest priority positions, then stretching spaces, afterwards extending inter char
+ spacing, and last spacing between arabic words.
+ NoJustification is for example set for arabic where no Kashida can be inserted or for diacritics.
+*/
+typedef enum {
+ HB_NoJustification= 0, /* Justification can't be applied after this glyph */
+ HB_Arabic_Space = 1, /* This glyph represents a space inside arabic text */
+ HB_Character = 2, /* Inter-character justification point follows this glyph */
+ HB_Space = 4, /* This glyph represents a blank outside an Arabic run */
+ HB_Arabic_Normal = 7, /* Normal Middle-Of-Word glyph that connects to the right (begin) */
+ HB_Arabic_Waw = 8, /* Next character is final form of Waw/Ain/Qaf/Fa */
+ HB_Arabic_BaRa = 9, /* Next two chars are Ba + Ra/Ya/AlefMaksura */
+ HB_Arabic_Alef = 10, /* Next character is final form of Alef/Tah/Lam/Kaf/Gaf */
+ HB_Arabic_HaaDal = 11, /* Next character is final form of Haa/Dal/Taa Marbutah */
+ HB_Arabic_Seen = 12, /* Initial or Medial form Of Seen/Sad */
+ HB_Arabic_Kashida = 13 /* Kashida(U+640) in middle of word */
+} HB_JustificationClass;
+
+/* This structure is binary compatible with Uniscribe's SCRIPT_VISATTR. Would be nice to keep
+ * it like that. If this is a problem please tell Trolltech :)
+ */
+typedef struct {
+ unsigned justification :4; /* Justification class */
+ unsigned clusterStart :1; /* First glyph of representation of cluster */
+ unsigned mark :1; /* needs to be positioned around base char */
+ unsigned zeroWidth :1; /* ZWJ, ZWNJ etc, with no width */
+ unsigned dontPrint :1;
+ unsigned combiningClass :8;
+} HB_GlyphAttributes;
+
+typedef struct HB_FaceRec_ {
+ HB_Bool isSymbolFont;
+
+ HB_GDEF gdef;
+ HB_GSUB gsub;
+ HB_GPOS gpos;
+ HB_Bool supported_scripts[HB_ScriptCount];
+ HB_Buffer buffer;
+ HB_Script current_script;
+ int current_flags; /* HB_ShaperFlags */
+ HB_Bool has_opentype_kerning;
+ HB_Bool glyphs_substituted;
+ HB_GlyphAttributes *tmpAttributes;
+ unsigned int *tmpLogClusters;
+ int length;
+ int orig_nglyphs;
+} HB_FaceRec;
+
+typedef HB_Error (*HB_GetFontTableFunc)(void *font, HB_Tag tag, HB_Byte *buffer, HB_UInt *length);
+
+HB_Face HB_NewFace(void *font, HB_GetFontTableFunc tableFunc);
+void HB_FreeFace(HB_Face face);
+
+typedef struct {
+ HB_Fixed x, y;
+ HB_Fixed width, height;
+ HB_Fixed xOffset, yOffset;
+} HB_GlyphMetrics;
+
+typedef enum {
+ HB_FontAscent
+} HB_FontMetric;
+
+typedef struct {
+ HB_Bool (*convertStringToGlyphIndices)(HB_Font font, const HB_UChar16 *string, hb_uint32 length, HB_Glyph *glyphs, hb_uint32 *numGlyphs, HB_Bool rightToLeft);
+ void (*getGlyphAdvances)(HB_Font font, const HB_Glyph *glyphs, hb_uint32 numGlyphs, HB_Fixed *advances, int flags /*HB_ShaperFlag*/);
+ HB_Bool (*canRender)(HB_Font font, const HB_UChar16 *string, hb_uint32 length);
+ /* implementation needs to make sure to load a scaled glyph, so /no/ FT_LOAD_NO_SCALE */
+ HB_Error (*getPointInOutline)(HB_Font font, HB_Glyph glyph, int flags /*HB_ShaperFlag*/, hb_uint32 point, HB_Fixed *xpos, HB_Fixed *ypos, hb_uint32 *nPoints);
+ void (*getGlyphMetrics)(HB_Font font, HB_Glyph glyph, HB_GlyphMetrics *metrics);
+ HB_Fixed (*getFontMetric)(HB_Font font, HB_FontMetric metric);
+} HB_FontClass;
+
+typedef struct HB_Font_ {
+ const HB_FontClass *klass;
+
+ /* Metrics */
+ HB_UShort x_ppem, y_ppem;
+ HB_16Dot16 x_scale, y_scale;
+
+ void *userData;
+} HB_FontRec;
+
+typedef struct HB_ShaperItem_ HB_ShaperItem;
+
+struct HB_ShaperItem_ {
+ const HB_UChar16 *string;
+ hb_uint32 stringLength;
+ HB_ScriptItem item;
+ HB_Font font;
+ HB_Face face;
+ int shaperFlags; /* HB_ShaperFlags */
+
+ HB_Bool glyphIndicesPresent; /* set to true if the glyph indicies are already setup in the glyphs array */
+ hb_uint32 initialGlyphCount;
+
+ hb_uint32 num_glyphs; /* in: available glyphs out: glyphs used/needed */
+ HB_Glyph *glyphs; /* out parameter */
+ HB_GlyphAttributes *attributes; /* out */
+ HB_Fixed *advances; /* out */
+ HB_FixedPoint *offsets; /* out */
+ unsigned short *log_clusters; /* out */
+
+ /* internal */
+ HB_Bool kerning_applied; /* out: kerning applied by shaper */
+};
+
+HB_Bool HB_ShapeItem(HB_ShaperItem *item);
+
+HB_END_HEADER
+
+#endif
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