1 files changed, 199 insertions, 0 deletions
diff --git a/third_party/harfbuzz/src/harfbuzz-shape.h b/third_party/harfbuzz/src/harfbuzz-shape.h
new file mode 100644
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+++ b/third_party/harfbuzz/src/harfbuzz-shape.h
@@ -0,0 +1,199 @@
+/*
+ * Copyright (C) 2006  Red Hat, Inc.
+ *
+ * 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.
+ *
+ * Red Hat Author(s): Owen Taylor
+ */
+
+#include <stdint.h>
+
+/* Base Types */
+
+typedef hb_uint16 HB_CodePoint; /* UTF-16 codepoint (not character ) */
+typedef char HB_Boolean;
+typedef hb_uint32 HB_Fixed; /* 26.6 */
+typedef hb_uint32 HB_Glyph;
+typedef hb_uint32 HB_Unichar;
+
+/* Metrics reported by the font backend for use of the shaper */
+typedef struct _HB_GlyphMetrics HB_GlyphMetrics;
+struct _HB_GlyphMetrics
+{
+    HB_Fixed advance;
+    
+    /* Do we need ink/logical extents for the glyph here? */
+};
+
+/*
+ * HB_Font: Abstract font interface.
+ *  First pass of this might just have FT_Face *getFace();
+ */
+typedef struct _HB_Font HB_Font;
+typedef struct _HB_FontClass HB_FontClass;
+
+struct HB_FontClass {
+    HB_Glyph   (*charToGlyph)(HB_Font *font, HB_Unichar chr);
+    void       (*getMetrics)(HB_Font *font, HB_Glyph glyph, HB_GlyphMetrics *metrics);
+    HB_Boolean (*getSFontTable)(HB_Font *font, void **cookie, char **start, int *len);
+    HB_Boolean (*freeSFontTable)(void **cookie);
+};
+
+struct _HB_Font {
+    HB_FontClass *clazz;
+};
+
+/*
+ * Language tags, of the form en-us; represented as interned, canonicalized
+ * strings. hb_language_from_string("en_US"), hb_language_from_string("en-us")
+ * both return the same (pointer-comparable) HB_Language).
+ */
+typedef struct HB_Language_ *HB_Language;
+
+HB_Language hb_language_from_string(const char *str);
+const char *hb_language_to_string(HB_Language language);
+
+/* Special treatment for the edges of runs.
+ */
+typedef enum {
+    HB_RUN_EDGE_LINE_VISUAL_EDGE    = 1 << 0,
+    HB_RUN_EDGE_LINE_LOGICAL_EDGE   = 1 << 1,
+    HB_RUN_EDGE_LINE_ADD_HYPHEN     = 1 << 2  /* ???? */
+} HB_RunEdge;
+
+/* Defines optional informaiton in HB_ShapeInput; this allows extension
+ * of HB_ShapeInput while keeping binary compatibility
+ */
+typedef enum {
+    HB_SHAPE_START_TYPE = 1 << 0,
+    HB_SHAPE_END_TYPE   = 1 << 1
+} HB_ShapeFlags;
+
+/* Attributes types are described by "interned strings"; this is a little
+ * annoying if you want to write a switch statement, but keeps things
+ * simple.
+ */
+typedef struct _HB_AttributeType *HB_AttributeType;
+
+HB_AttributeType hb_attribute_type_from_string(const char *str);
+const char *hb_attribute_type_to_string(HB_AttributeType attribute_type);
+
+struct HB_Attribute {
+    HB_AttributeType type;
+    int start; 
+    int end;
+};
+
+
+/**
+ * You could handle this like HB_Language, but an enum seems a little nicer;
+ * another approach would be to use OpenType script tags.
+ */
+typedef enum {
+    HB_SCRIPT_LATIN
+    /* ... */
+} HB_ShapeScript;
+
+/* This is just the subset of direction information needed by the shaper */
+typedef enum {
+    HB_DIRECTION_LTR,
+    HB_DIRECTION_RTL,
+    HB_DIRECTION_TTB
+} HB_Direction;
+
+typedef struct _HB_ShapeInput HB_ShapeInput;
+struct _HB_ShapeInput {
+    /* Defines what fields the caller has initialized - fields not in
+     * the enum are mandatory.
+     */
+    HB_ShapeFlags flags;
+    
+    HB_CodePoint *text;
+    int length;       /* total length of text to shape */
+    int shape_offset; /* start of section to shape */
+    int shape_length; /* number of code points to shape */
+
+    HB_Direction direction;
+    HB_ShapeScript script;
+    HB_Language language;
+
+    HB_AttributeType *attributes;
+    int n_attributes;
+
+    HB_RunEdge start_type;
+    HB_RunEdge end_type;
+};
+
+struct HB_GlyphItem {
+    HB_Glyph glyph;
+    
+    HB_Fixed x_offset;
+    HB_Fixed y_offset;
+    HB_Fixed advance;
+
+    /* Add kashida information, etc, here */
+};
+
+typedef enum {
+    HB_RESULT_SUCCESS,
+    HB_RESULT_NO_MEMORY,
+    HB_SHAPE_RESULT_FAILED
+} HB_Result;
+
+/*
+ * Buffer for output 
+ */
+typedef struct _HB_GlyphBufer HB_GlyphBuffer;
+struct _HB_GlyphBuffer {
+    int glyph_item_size;
+    int total_glyphs;
+    
+    int *log_clusters; /* Uniscribe style */
+    int cluster_space;
+  
+    int glyph_space;
+    void *glyph_buffer;
+};
+
+/* Making this self-allocating simplifies writing shapers and
+ * also keeps things easier for caller. item_size passed in
+ * must be at least sizeof(HB_GlyphItem) but can be bigger,
+ * to accomodate application structures that extend HB_GlyphItem.
+ * The allocated items will be zero-initialized.
+ *
+ * (Hack: Harfbuzz could choose to use even a *bigger* item size
+ * and stick internal information before the public item structure.
+ * This hack could possibly be used to unify this with HB_Buffer)
+ */
+HB_GlyphBuffer *hb_glyph_buffer_new             (size_t item_size);
+void            hb_glyph_buffer_clear           (HB_GlyphBuffer *buf);
+HB_Result       hb_glyph_buffer_extend_glyphs   (HB_GlyphBuffer *buf, int n_items);
+HB_Result       hb_glyph_buffer_extend_clusters (HB_GlyphBuffer *buf, int n_clusters);
+void            hb_glyph_buffer_free            (HB_GlyphBuffer *buf);
+
+
+/* Accessor for a particular glyph */
+#define HB_GLYPH_BUFFER_ITEM(buffer, index)
+
+/*
+ * Main shaping function
+ */
+HB_Result hb_shape(HB_ShapeInput *input, HB_GlyphBuffer *output);