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+/***************************************************************************
+ *
+ * FreeType auto-fitter
+ *
+ * (c) 2004 David Turner
+ *
+ * The auto-fitter is a complete rewrite of the old auto-hinter.
+ * its main feature is the ability to differentiate between different
+ * scripts in order to apply language-specific rules.
+ *
+ * the code has also been compartimentized into several entities that
+ * should make algorithmic experimentation easier than with the old
+ * code.
+ *
+ * finally, we get rid of the Catharon license, since this code is
+ * released under the FreeType one.
+ */
+#ifndef __AFTYPES_H__
+#define __AFTYPES_H__
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include FT_OUTLINE_H
+#include FT_INTERNAL_OBJECTS_H
+#include FT_INTERNAL_DEBUG_H
+
+FT_BEGIN_HEADER
+
+ /**************************************************************************/
+ /**************************************************************************/
+ /***** *****/
+ /***** D E B U G G I N G *****/
+ /***** *****/
+ /**************************************************************************/
+ /**************************************************************************/
+
+#define xxAF_DEBUG
+
+#ifdef AF_DEBUG
+
+# include <stdio.h>
+# define AF_LOG( x ) printf x
+
+#else
+
+# define AF_LOG( x ) do ; while ( 0 ) /* nothing */
+
+#endif /* AF_DEBUG */
+
+ /**************************************************************************/
+ /**************************************************************************/
+ /***** *****/
+ /***** U T I L I T Y *****/
+ /***** *****/
+ /**************************************************************************/
+ /**************************************************************************/
+
+ typedef struct AF_WidthRec_
+ {
+ FT_Pos org; /* original position/width in font units */
+ FT_Pos cur; /* current/scaled position/width in device sub-pixels */
+ FT_Pos fit; /* current/fitted position/width in device sub-pixels */
+
+ } AF_WidthRec, *AF_Width;
+
+
+ FT_LOCAL( void )
+ af_sort_pos( FT_UInt count,
+ FT_Pos* table );
+
+ FT_LOCAL( void )
+ af_sort_widths( FT_UInt count,
+ AF_Width widths );
+
+
+ /**************************************************************************/
+ /**************************************************************************/
+ /***** *****/
+ /***** A N G L E T Y P E S *****/
+ /***** *****/
+ /**************************************************************************/
+ /**************************************************************************/
+
+ /*
+ * Angle type. The auto-fitter doesn't need a very high angular accuracy,
+ * and this allows us to speed up some computations considerably with a
+ * light Cordic algorithm (see afangles.c)
+ *
+ */
+
+ typedef FT_Int AF_Angle;
+
+#define AF_ANGLE_PI 256
+#define AF_ANGLE_2PI (AF_ANGLE_PI*2)
+#define AF_ANGLE_PI2 (AF_ANGLE_PI/2)
+#define AF_ANGLE_PI4 (AF_ANGLE_PI/4)
+
+ /*
+ * compute the angle of a given 2-D vector
+ *
+ */
+ FT_LOCAL( AF_Angle )
+ af_angle_atan( FT_Pos dx,
+ FT_Pos dy );
+
+
+ /*
+ * computes "angle2 - angle1", the result is always within
+ * the range [ -AF_ANGLE_PI .. AF_ANGLE_PI-1 ]
+ *
+ */
+ FT_LOCAL( AF_Angle )
+ af_angle_diff( AF_Angle angle1,
+ AF_Angle angle2 );
+
+
+ /**************************************************************************/
+ /**************************************************************************/
+ /***** *****/
+ /***** O U T L I N E S *****/
+ /***** *****/
+ /**************************************************************************/
+ /**************************************************************************/
+
+ /* opaque handle to glyph-specific hints. see "afhints.h" for more
+ * details
+ */
+ typedef struct AF_GlyphHintsRec_* AF_GlyphHints;
+
+ /* this structure is used to model an input glyph outline to
+ * the auto-hinter. The latter will set the "hints" field
+ * depending on the glyph's script
+ */
+ typedef struct AF_OutlineRec_
+ {
+ FT_Face face;
+ FT_Outline outline;
+ FT_UInt outline_resolution;
+
+ FT_Int advance;
+ FT_UInt metrics_resolution;
+
+ AF_GlyphHints hints;
+
+ } AF_OutlineRec;
+
+
+ /**************************************************************************/
+ /**************************************************************************/
+ /***** *****/
+ /***** S C A L E R S *****/
+ /***** *****/
+ /**************************************************************************/
+ /**************************************************************************/
+
+ /*
+ * A scaler models the target pixel device that will receive the
+ * auto-hinted glyph image
+ *
+ */
+
+ typedef enum
+ {
+ AF_SCALER_FLAG_NO_HORIZONTAL = 1, /* disable horizontal hinting */
+ AF_SCALER_FLAG_NO_VERTICAL = 2, /* disable vertical hinting */
+ AF_SCALER_FLAG_NO_ADVANCE = 4 /* disable advance hinting */
+
+ } AF_ScalerFlags;
+
+
+ typedef struct AF_ScalerRec_
+ {
+ FT_Face face; /* source font face */
+ FT_Fixed x_scale; /* from font units to 1/64th device pixels */
+ FT_Fixed y_scale; /* from font units to 1/64th device pixels */
+ FT_Pos x_delta; /* in 1/64th device pixels */
+ FT_Pos y_delta; /* in 1/64th device pixels */
+ FT_Render_Mode render_mode; /* monochrome, anti-aliased, LCD, etc.. */
+ FT_UInt32 flags; /* additionnal control flags, see above */
+
+ } AF_ScalerRec, *AF_Scaler;
+
+
+#define AF_SCALER_EQUAL_SCALES(a,b) \
+ ( (a)->x_scale == (b)->x_scale && \
+ (a)->y_scale == (b)->y_scale && \
+ (a)->x_delta == (b)->x_delta && \
+ (a)->y_delta == (b)->y_delta )
+
+
+ /**************************************************************************/
+ /**************************************************************************/
+ /***** *****/
+ /***** S C R I P T S *****/
+ /***** *****/
+ /**************************************************************************/
+ /**************************************************************************/
+
+ /*
+ * the list of know scripts. Each different script correspond to the
+ * following information:
+ *
+ * - a set of Unicode ranges to test weither the face supports the
+ * script
+ *
+ * - a specific global analyzer that will compute global metrics
+ * specific to the script.
+ *
+ * - a specific glyph analyzer that will compute segments and
+ * edges for each glyph covered by the script
+ *
+ * - a specific grid-fitting algorithm that will distort the
+ * scaled glyph outline according to the results of the glyph
+ * analyzer
+ *
+ * note that a given analyzer and/or grid-fitting algorithm can be
+ * used by more than one script
+ */
+ typedef enum
+ {
+ AF_SCRIPT_NONE = 0,
+ AF_SCRIPT_LATIN = 1,
+ /* add new scripts here. don't forget to update the list in "afglobal.c" */
+
+ AF_SCRIPT_MAX /* do not remove */
+
+ } AF_Script;
+
+
+
+ typedef struct AF_ScriptClassRec_ const* AF_ScriptClass;
+
+ typedef struct AF_ScriptMetricsRec_
+ {
+ AF_ScriptClass clazz;
+ AF_ScalerRec scaler;
+
+ } AF_ScriptMetricsRec, *AF_ScriptMetrics;
+
+
+ /* this function parses a FT_Face to compute global metrics for
+ * a specific script
+ */
+ typedef FT_Error (*AF_Script_InitMetricsFunc)( AF_ScriptMetrics metrics,
+ FT_Face face );
+
+ typedef void (*AF_Script_ScaleMetricsFunc)( AF_ScriptMetrics metrics,
+ AF_Scaler scaler );
+
+ typedef void (*AF_Script_DoneMetricsFunc)( AF_ScriptMetrics metrics );
+
+
+ typedef FT_Error (*AF_Script_InitHintsFunc)( AF_GlyphHints hints,
+ AF_ScriptMetrics metrics );
+
+ typedef void (*AF_Script_ApplyHintsFunc)( AF_GlyphHints hints,
+ FT_Outline* outline,
+ AF_ScriptMetrics metrics );
+
+
+ typedef struct AF_Script_UniRangeRec_
+ {
+ FT_UInt32 first;
+ FT_UInt32 last;
+
+ } AF_Script_UniRangeRec;
+
+ typedef const AF_Script_UniRangeRec * AF_Script_UniRange;
+
+ typedef struct AF_ScriptClassRec_
+ {
+ AF_Script script;
+ AF_Script_UniRange script_uni_ranges; /* last must be { 0, 0 } */
+
+ FT_UInt script_metrics_size;
+ AF_Script_InitMetricsFunc script_metrics_init;
+ AF_Script_ScaleMetricsFunc script_metrics_scale;
+ AF_Script_DoneMetricsFunc script_metrics_done;
+
+ AF_Script_InitHintsFunc script_hints_init;
+ AF_Script_ApplyHintsFunc script_hints_apply;
+
+ } AF_ScriptClassRec;
+
+
+/* */
+
+FT_END_HEADER
+
+#endif /* __AFTYPES_H__ */
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