--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libfreetype/src/base/ftoutln.c Mon Apr 25 01:46:54 2011 +0200
@@ -0,0 +1,1129 @@
+/***************************************************************************/
+/* */
+/* ftoutln.c */
+/* */
+/* FreeType outline management (body). */
+/* */
+/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2010 by */
+/* David Turner, Robert Wilhelm, and Werner Lemberg. */
+/* */
+/* This file is part of the FreeType project, and may only be used, */
+/* modified, and distributed under the terms of the FreeType project */
+/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
+/* this file you indicate that you have read the license and */
+/* understand and accept it fully. */
+/* */
+/***************************************************************************/
+
+
+ /*************************************************************************/
+ /* */
+ /* All functions are declared in freetype.h. */
+ /* */
+ /*************************************************************************/
+
+
+#include <ft2build.h>
+#include FT_OUTLINE_H
+#include FT_INTERNAL_OBJECTS_H
+#include FT_INTERNAL_DEBUG_H
+#include FT_TRIGONOMETRY_H
+
+
+ /*************************************************************************/
+ /* */
+ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
+ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
+ /* messages during execution. */
+ /* */
+#undef FT_COMPONENT
+#define FT_COMPONENT trace_outline
+
+
+ static
+ const FT_Outline null_outline = { 0, 0, 0, 0, 0, 0 };
+
+
+ /* documentation is in ftoutln.h */
+
+ FT_EXPORT_DEF( FT_Error )
+ FT_Outline_Decompose( FT_Outline* outline,
+ const FT_Outline_Funcs* func_interface,
+ void* user )
+ {
+#undef SCALED
+#define SCALED( x ) ( ( (x) << shift ) - delta )
+
+ FT_Vector v_last;
+ FT_Vector v_control;
+ FT_Vector v_start;
+
+ FT_Vector* point;
+ FT_Vector* limit;
+ char* tags;
+
+ FT_Error error;
+
+ FT_Int n; /* index of contour in outline */
+ FT_UInt first; /* index of first point in contour */
+ FT_Int tag; /* current point's state */
+
+ FT_Int shift;
+ FT_Pos delta;
+
+
+ if ( !outline || !func_interface )
+ return FT_Err_Invalid_Argument;
+
+ shift = func_interface->shift;
+ delta = func_interface->delta;
+ first = 0;
+
+ for ( n = 0; n < outline->n_contours; n++ )
+ {
+ FT_Int last; /* index of last point in contour */
+
+
+ FT_TRACE5(( "FT_Outline_Decompose: Outline %d\n", n ));
+
+ last = outline->contours[n];
+ if ( last < 0 )
+ goto Invalid_Outline;
+ limit = outline->points + last;
+
+ v_start = outline->points[first];
+ v_start.x = SCALED( v_start.x );
+ v_start.y = SCALED( v_start.y );
+
+ v_last = outline->points[last];
+ v_last.x = SCALED( v_last.x );
+ v_last.y = SCALED( v_last.y );
+
+ v_control = v_start;
+
+ point = outline->points + first;
+ tags = outline->tags + first;
+ tag = FT_CURVE_TAG( tags[0] );
+
+ /* A contour cannot start with a cubic control point! */
+ if ( tag == FT_CURVE_TAG_CUBIC )
+ goto Invalid_Outline;
+
+ /* check first point to determine origin */
+ if ( tag == FT_CURVE_TAG_CONIC )
+ {
+ /* first point is conic control. Yes, this happens. */
+ if ( FT_CURVE_TAG( outline->tags[last] ) == FT_CURVE_TAG_ON )
+ {
+ /* start at last point if it is on the curve */
+ v_start = v_last;
+ limit--;
+ }
+ else
+ {
+ /* if both first and last points are conic, */
+ /* start at their middle and record its position */
+ /* for closure */
+ v_start.x = ( v_start.x + v_last.x ) / 2;
+ v_start.y = ( v_start.y + v_last.y ) / 2;
+
+ v_last = v_start;
+ }
+ point--;
+ tags--;
+ }
+
+ FT_TRACE5(( " move to (%.2f, %.2f)\n",
+ v_start.x / 64.0, v_start.y / 64.0 ));
+ error = func_interface->move_to( &v_start, user );
+ if ( error )
+ goto Exit;
+
+ while ( point < limit )
+ {
+ point++;
+ tags++;
+
+ tag = FT_CURVE_TAG( tags[0] );
+ switch ( tag )
+ {
+ case FT_CURVE_TAG_ON: /* emit a single line_to */
+ {
+ FT_Vector vec;
+
+
+ vec.x = SCALED( point->x );
+ vec.y = SCALED( point->y );
+
+ FT_TRACE5(( " line to (%.2f, %.2f)\n",
+ vec.x / 64.0, vec.y / 64.0 ));
+ error = func_interface->line_to( &vec, user );
+ if ( error )
+ goto Exit;
+ continue;
+ }
+
+ case FT_CURVE_TAG_CONIC: /* consume conic arcs */
+ v_control.x = SCALED( point->x );
+ v_control.y = SCALED( point->y );
+
+ Do_Conic:
+ if ( point < limit )
+ {
+ FT_Vector vec;
+ FT_Vector v_middle;
+
+
+ point++;
+ tags++;
+ tag = FT_CURVE_TAG( tags[0] );
+
+ vec.x = SCALED( point->x );
+ vec.y = SCALED( point->y );
+
+ if ( tag == FT_CURVE_TAG_ON )
+ {
+ FT_TRACE5(( " conic to (%.2f, %.2f)"
+ " with control (%.2f, %.2f)\n",
+ vec.x / 64.0, vec.y / 64.0,
+ v_control.x / 64.0, v_control.y / 64.0 ));
+ error = func_interface->conic_to( &v_control, &vec, user );
+ if ( error )
+ goto Exit;
+ continue;
+ }
+
+ if ( tag != FT_CURVE_TAG_CONIC )
+ goto Invalid_Outline;
+
+ v_middle.x = ( v_control.x + vec.x ) / 2;
+ v_middle.y = ( v_control.y + vec.y ) / 2;
+
+ FT_TRACE5(( " conic to (%.2f, %.2f)"
+ " with control (%.2f, %.2f)\n",
+ v_middle.x / 64.0, v_middle.y / 64.0,
+ v_control.x / 64.0, v_control.y / 64.0 ));
+ error = func_interface->conic_to( &v_control, &v_middle, user );
+ if ( error )
+ goto Exit;
+
+ v_control = vec;
+ goto Do_Conic;
+ }
+
+ FT_TRACE5(( " conic to (%.2f, %.2f)"
+ " with control (%.2f, %.2f)\n",
+ v_start.x / 64.0, v_start.y / 64.0,
+ v_control.x / 64.0, v_control.y / 64.0 ));
+ error = func_interface->conic_to( &v_control, &v_start, user );
+ goto Close;
+
+ default: /* FT_CURVE_TAG_CUBIC */
+ {
+ FT_Vector vec1, vec2;
+
+
+ if ( point + 1 > limit ||
+ FT_CURVE_TAG( tags[1] ) != FT_CURVE_TAG_CUBIC )
+ goto Invalid_Outline;
+
+ point += 2;
+ tags += 2;
+
+ vec1.x = SCALED( point[-2].x );
+ vec1.y = SCALED( point[-2].y );
+
+ vec2.x = SCALED( point[-1].x );
+ vec2.y = SCALED( point[-1].y );
+
+ if ( point <= limit )
+ {
+ FT_Vector vec;
+
+
+ vec.x = SCALED( point->x );
+ vec.y = SCALED( point->y );
+
+ FT_TRACE5(( " cubic to (%.2f, %.2f)"
+ " with controls (%.2f, %.2f) and (%.2f, %.2f)\n",
+ vec.x / 64.0, vec.y / 64.0,
+ vec1.x / 64.0, vec1.y / 64.0,
+ vec2.x / 64.0, vec2.y / 64.0 ));
+ error = func_interface->cubic_to( &vec1, &vec2, &vec, user );
+ if ( error )
+ goto Exit;
+ continue;
+ }
+
+ FT_TRACE5(( " cubic to (%.2f, %.2f)"
+ " with controls (%.2f, %.2f) and (%.2f, %.2f)\n",
+ v_start.x / 64.0, v_start.y / 64.0,
+ vec1.x / 64.0, vec1.y / 64.0,
+ vec2.x / 64.0, vec2.y / 64.0 ));
+ error = func_interface->cubic_to( &vec1, &vec2, &v_start, user );
+ goto Close;
+ }
+ }
+ }
+
+ /* close the contour with a line segment */
+ FT_TRACE5(( " line to (%.2f, %.2f)\n",
+ v_start.x / 64.0, v_start.y / 64.0 ));
+ error = func_interface->line_to( &v_start, user );
+
+ Close:
+ if ( error )
+ goto Exit;
+
+ first = last + 1;
+ }
+
+ FT_TRACE5(( "FT_Outline_Decompose: Done\n", n ));
+ return FT_Err_Ok;
+
+ Exit:
+ FT_TRACE5(( "FT_Outline_Decompose: Error %d\n", error ));
+ return error;
+
+ Invalid_Outline:
+ return FT_Err_Invalid_Outline;
+ }
+
+
+ FT_EXPORT_DEF( FT_Error )
+ FT_Outline_New_Internal( FT_Memory memory,
+ FT_UInt numPoints,
+ FT_Int numContours,
+ FT_Outline *anoutline )
+ {
+ FT_Error error;
+
+
+ if ( !anoutline || !memory )
+ return FT_Err_Invalid_Argument;
+
+ *anoutline = null_outline;
+
+ if ( FT_NEW_ARRAY( anoutline->points, numPoints ) ||
+ FT_NEW_ARRAY( anoutline->tags, numPoints ) ||
+ FT_NEW_ARRAY( anoutline->contours, numContours ) )
+ goto Fail;
+
+ anoutline->n_points = (FT_UShort)numPoints;
+ anoutline->n_contours = (FT_Short)numContours;
+ anoutline->flags |= FT_OUTLINE_OWNER;
+
+ return FT_Err_Ok;
+
+ Fail:
+ anoutline->flags |= FT_OUTLINE_OWNER;
+ FT_Outline_Done_Internal( memory, anoutline );
+
+ return error;
+ }
+
+
+ /* documentation is in ftoutln.h */
+
+ FT_EXPORT_DEF( FT_Error )
+ FT_Outline_New( FT_Library library,
+ FT_UInt numPoints,
+ FT_Int numContours,
+ FT_Outline *anoutline )
+ {
+ if ( !library )
+ return FT_Err_Invalid_Library_Handle;
+
+ return FT_Outline_New_Internal( library->memory, numPoints,
+ numContours, anoutline );
+ }
+
+
+ /* documentation is in ftoutln.h */
+
+ FT_EXPORT_DEF( FT_Error )
+ FT_Outline_Check( FT_Outline* outline )
+ {
+ if ( outline )
+ {
+ FT_Int n_points = outline->n_points;
+ FT_Int n_contours = outline->n_contours;
+ FT_Int end0, end;
+ FT_Int n;
+
+
+ /* empty glyph? */
+ if ( n_points == 0 && n_contours == 0 )
+ return 0;
+
+ /* check point and contour counts */
+ if ( n_points <= 0 || n_contours <= 0 )
+ goto Bad;
+
+ end0 = end = -1;
+ for ( n = 0; n < n_contours; n++ )
+ {
+ end = outline->contours[n];
+
+ /* note that we don't accept empty contours */
+ if ( end <= end0 || end >= n_points )
+ goto Bad;
+
+ end0 = end;
+ }
+
+ if ( end != n_points - 1 )
+ goto Bad;
+
+ /* XXX: check the tags array */
+ return 0;
+ }
+
+ Bad:
+ return FT_Err_Invalid_Argument;
+ }
+
+
+ /* documentation is in ftoutln.h */
+
+ FT_EXPORT_DEF( FT_Error )
+ FT_Outline_Copy( const FT_Outline* source,
+ FT_Outline *target )
+ {
+ FT_Int is_owner;
+
+
+ if ( !source || !target ||
+ source->n_points != target->n_points ||
+ source->n_contours != target->n_contours )
+ return FT_Err_Invalid_Argument;
+
+ if ( source == target )
+ return FT_Err_Ok;
+
+ FT_ARRAY_COPY( target->points, source->points, source->n_points );
+
+ FT_ARRAY_COPY( target->tags, source->tags, source->n_points );
+
+ FT_ARRAY_COPY( target->contours, source->contours, source->n_contours );
+
+ /* copy all flags, except the `FT_OUTLINE_OWNER' one */
+ is_owner = target->flags & FT_OUTLINE_OWNER;
+ target->flags = source->flags;
+
+ target->flags &= ~FT_OUTLINE_OWNER;
+ target->flags |= is_owner;
+
+ return FT_Err_Ok;
+ }
+
+
+ FT_EXPORT_DEF( FT_Error )
+ FT_Outline_Done_Internal( FT_Memory memory,
+ FT_Outline* outline )
+ {
+ if ( memory && outline )
+ {
+ if ( outline->flags & FT_OUTLINE_OWNER )
+ {
+ FT_FREE( outline->points );
+ FT_FREE( outline->tags );
+ FT_FREE( outline->contours );
+ }
+ *outline = null_outline;
+
+ return FT_Err_Ok;
+ }
+ else
+ return FT_Err_Invalid_Argument;
+ }
+
+
+ /* documentation is in ftoutln.h */
+
+ FT_EXPORT_DEF( FT_Error )
+ FT_Outline_Done( FT_Library library,
+ FT_Outline* outline )
+ {
+ /* check for valid `outline' in FT_Outline_Done_Internal() */
+
+ if ( !library )
+ return FT_Err_Invalid_Library_Handle;
+
+ return FT_Outline_Done_Internal( library->memory, outline );
+ }
+
+
+ /* documentation is in ftoutln.h */
+
+ FT_EXPORT_DEF( void )
+ FT_Outline_Get_CBox( const FT_Outline* outline,
+ FT_BBox *acbox )
+ {
+ FT_Pos xMin, yMin, xMax, yMax;
+
+
+ if ( outline && acbox )
+ {
+ if ( outline->n_points == 0 )
+ {
+ xMin = 0;
+ yMin = 0;
+ xMax = 0;
+ yMax = 0;
+ }
+ else
+ {
+ FT_Vector* vec = outline->points;
+ FT_Vector* limit = vec + outline->n_points;
+
+
+ xMin = xMax = vec->x;
+ yMin = yMax = vec->y;
+ vec++;
+
+ for ( ; vec < limit; vec++ )
+ {
+ FT_Pos x, y;
+
+
+ x = vec->x;
+ if ( x < xMin ) xMin = x;
+ if ( x > xMax ) xMax = x;
+
+ y = vec->y;
+ if ( y < yMin ) yMin = y;
+ if ( y > yMax ) yMax = y;
+ }
+ }
+ acbox->xMin = xMin;
+ acbox->xMax = xMax;
+ acbox->yMin = yMin;
+ acbox->yMax = yMax;
+ }
+ }
+
+
+ /* documentation is in ftoutln.h */
+
+ FT_EXPORT_DEF( void )
+ FT_Outline_Translate( const FT_Outline* outline,
+ FT_Pos xOffset,
+ FT_Pos yOffset )
+ {
+ FT_UShort n;
+ FT_Vector* vec;
+
+
+ if ( !outline )
+ return;
+
+ vec = outline->points;
+
+ for ( n = 0; n < outline->n_points; n++ )
+ {
+ vec->x += xOffset;
+ vec->y += yOffset;
+ vec++;
+ }
+ }
+
+
+ /* documentation is in ftoutln.h */
+
+ FT_EXPORT_DEF( void )
+ FT_Outline_Reverse( FT_Outline* outline )
+ {
+ FT_UShort n;
+ FT_Int first, last;
+
+
+ if ( !outline )
+ return;
+
+ first = 0;
+
+ for ( n = 0; n < outline->n_contours; n++ )
+ {
+ last = outline->contours[n];
+
+ /* reverse point table */
+ {
+ FT_Vector* p = outline->points + first;
+ FT_Vector* q = outline->points + last;
+ FT_Vector swap;
+
+
+ while ( p < q )
+ {
+ swap = *p;
+ *p = *q;
+ *q = swap;
+ p++;
+ q--;
+ }
+ }
+
+ /* reverse tags table */
+ {
+ char* p = outline->tags + first;
+ char* q = outline->tags + last;
+ char swap;
+
+
+ while ( p < q )
+ {
+ swap = *p;
+ *p = *q;
+ *q = swap;
+ p++;
+ q--;
+ }
+ }
+
+ first = last + 1;
+ }
+
+ outline->flags ^= FT_OUTLINE_REVERSE_FILL;
+ }
+
+
+ /* documentation is in ftoutln.h */
+
+ FT_EXPORT_DEF( FT_Error )
+ FT_Outline_Render( FT_Library library,
+ FT_Outline* outline,
+ FT_Raster_Params* params )
+ {
+ FT_Error error;
+ FT_Bool update = FALSE;
+ FT_Renderer renderer;
+ FT_ListNode node;
+
+
+ if ( !library )
+ return FT_Err_Invalid_Library_Handle;
+
+ if ( !outline || !params )
+ return FT_Err_Invalid_Argument;
+
+ renderer = library->cur_renderer;
+ node = library->renderers.head;
+
+ params->source = (void*)outline;
+
+ error = FT_Err_Cannot_Render_Glyph;
+ while ( renderer )
+ {
+ error = renderer->raster_render( renderer->raster, params );
+ if ( !error || FT_ERROR_BASE( error ) != FT_Err_Cannot_Render_Glyph )
+ break;
+
+ /* FT_Err_Cannot_Render_Glyph is returned if the render mode */
+ /* is unsupported by the current renderer for this glyph image */
+ /* format */
+
+ /* now, look for another renderer that supports the same */
+ /* format */
+ renderer = FT_Lookup_Renderer( library, FT_GLYPH_FORMAT_OUTLINE,
+ &node );
+ update = TRUE;
+ }
+
+ /* if we changed the current renderer for the glyph image format */
+ /* we need to select it as the next current one */
+ if ( !error && update && renderer )
+ FT_Set_Renderer( library, renderer, 0, 0 );
+
+ return error;
+ }
+
+
+ /* documentation is in ftoutln.h */
+
+ FT_EXPORT_DEF( FT_Error )
+ FT_Outline_Get_Bitmap( FT_Library library,
+ FT_Outline* outline,
+ const FT_Bitmap *abitmap )
+ {
+ FT_Raster_Params params;
+
+
+ if ( !abitmap )
+ return FT_Err_Invalid_Argument;
+
+ /* other checks are delayed to FT_Outline_Render() */
+
+ params.target = abitmap;
+ params.flags = 0;
+
+ if ( abitmap->pixel_mode == FT_PIXEL_MODE_GRAY ||
+ abitmap->pixel_mode == FT_PIXEL_MODE_LCD ||
+ abitmap->pixel_mode == FT_PIXEL_MODE_LCD_V )
+ params.flags |= FT_RASTER_FLAG_AA;
+
+ return FT_Outline_Render( library, outline, ¶ms );
+ }
+
+
+ /* documentation is in freetype.h */
+
+ FT_EXPORT_DEF( void )
+ FT_Vector_Transform( FT_Vector* vector,
+ const FT_Matrix* matrix )
+ {
+ FT_Pos xz, yz;
+
+
+ if ( !vector || !matrix )
+ return;
+
+ xz = FT_MulFix( vector->x, matrix->xx ) +
+ FT_MulFix( vector->y, matrix->xy );
+
+ yz = FT_MulFix( vector->x, matrix->yx ) +
+ FT_MulFix( vector->y, matrix->yy );
+
+ vector->x = xz;
+ vector->y = yz;
+ }
+
+
+ /* documentation is in ftoutln.h */
+
+ FT_EXPORT_DEF( void )
+ FT_Outline_Transform( const FT_Outline* outline,
+ const FT_Matrix* matrix )
+ {
+ FT_Vector* vec;
+ FT_Vector* limit;
+
+
+ if ( !outline || !matrix )
+ return;
+
+ vec = outline->points;
+ limit = vec + outline->n_points;
+
+ for ( ; vec < limit; vec++ )
+ FT_Vector_Transform( vec, matrix );
+ }
+
+
+#if 0
+
+#define FT_OUTLINE_GET_CONTOUR( outline, c, first, last ) \
+ do { \
+ (first) = ( c > 0 ) ? (outline)->points + \
+ (outline)->contours[c - 1] + 1 \
+ : (outline)->points; \
+ (last) = (outline)->points + (outline)->contours[c]; \
+ } while ( 0 )
+
+
+ /* Is a point in some contour? */
+ /* */
+ /* We treat every point of the contour as if it */
+ /* it were ON. That is, we allow false positives, */
+ /* but disallow false negatives. (XXX really?) */
+ static FT_Bool
+ ft_contour_has( FT_Outline* outline,
+ FT_Short c,
+ FT_Vector* point )
+ {
+ FT_Vector* first;
+ FT_Vector* last;
+ FT_Vector* a;
+ FT_Vector* b;
+ FT_UInt n = 0;
+
+
+ FT_OUTLINE_GET_CONTOUR( outline, c, first, last );
+
+ for ( a = first; a <= last; a++ )
+ {
+ FT_Pos x;
+ FT_Int intersect;
+
+
+ b = ( a == last ) ? first : a + 1;
+
+ intersect = ( a->y - point->y ) ^ ( b->y - point->y );
+
+ /* a and b are on the same side */
+ if ( intersect >= 0 )
+ {
+ if ( intersect == 0 && a->y == point->y )
+ {
+ if ( ( a->x <= point->x && b->x >= point->x ) ||
+ ( a->x >= point->x && b->x <= point->x ) )
+ return 1;
+ }
+
+ continue;
+ }
+
+ x = a->x + ( b->x - a->x ) * (point->y - a->y ) / ( b->y - a->y );
+
+ if ( x < point->x )
+ n++;
+ else if ( x == point->x )
+ return 1;
+ }
+
+ return ( n % 2 );
+ }
+
+
+ static FT_Bool
+ ft_contour_enclosed( FT_Outline* outline,
+ FT_UShort c )
+ {
+ FT_Vector* first;
+ FT_Vector* last;
+ FT_Short i;
+
+
+ FT_OUTLINE_GET_CONTOUR( outline, c, first, last );
+
+ for ( i = 0; i < outline->n_contours; i++ )
+ {
+ if ( i != c && ft_contour_has( outline, i, first ) )
+ {
+ FT_Vector* pt;
+
+
+ for ( pt = first + 1; pt <= last; pt++ )
+ if ( !ft_contour_has( outline, i, pt ) )
+ return 0;
+
+ return 1;
+ }
+ }
+
+ return 0;
+ }
+
+
+ /* This version differs from the public one in that each */
+ /* part (contour not enclosed in another contour) of the */
+ /* outline is checked for orientation. This is */
+ /* necessary for some buggy CJK fonts. */
+ static FT_Orientation
+ ft_outline_get_orientation( FT_Outline* outline )
+ {
+ FT_Short i;
+ FT_Vector* first;
+ FT_Vector* last;
+ FT_Orientation orient = FT_ORIENTATION_NONE;
+
+
+ first = outline->points;
+ for ( i = 0; i < outline->n_contours; i++, first = last + 1 )
+ {
+ FT_Vector* point;
+ FT_Vector* xmin_point;
+ FT_Pos xmin;
+
+
+ last = outline->points + outline->contours[i];
+
+ /* skip degenerate contours */
+ if ( last < first + 2 )
+ continue;
+
+ if ( ft_contour_enclosed( outline, i ) )
+ continue;
+
+ xmin = first->x;
+ xmin_point = first;
+
+ for ( point = first + 1; point <= last; point++ )
+ {
+ if ( point->x < xmin )
+ {
+ xmin = point->x;
+ xmin_point = point;
+ }
+ }
+
+ /* check the orientation of the contour */
+ {
+ FT_Vector* prev;
+ FT_Vector* next;
+ FT_Orientation o;
+
+
+ prev = ( xmin_point == first ) ? last : xmin_point - 1;
+ next = ( xmin_point == last ) ? first : xmin_point + 1;
+
+ if ( FT_Atan2( prev->x - xmin_point->x, prev->y - xmin_point->y ) >
+ FT_Atan2( next->x - xmin_point->x, next->y - xmin_point->y ) )
+ o = FT_ORIENTATION_POSTSCRIPT;
+ else
+ o = FT_ORIENTATION_TRUETYPE;
+
+ if ( orient == FT_ORIENTATION_NONE )
+ orient = o;
+ else if ( orient != o )
+ return FT_ORIENTATION_NONE;
+ }
+ }
+
+ return orient;
+ }
+
+#endif /* 0 */
+
+
+ /* documentation is in ftoutln.h */
+
+ FT_EXPORT_DEF( FT_Error )
+ FT_Outline_Embolden( FT_Outline* outline,
+ FT_Pos strength )
+ {
+ FT_Vector* points;
+ FT_Vector v_prev, v_first, v_next, v_cur;
+ FT_Angle rotate, angle_in, angle_out;
+ FT_Int c, n, first;
+ FT_Int orientation;
+
+
+ if ( !outline )
+ return FT_Err_Invalid_Argument;
+
+ strength /= 2;
+ if ( strength == 0 )
+ return FT_Err_Ok;
+
+ orientation = FT_Outline_Get_Orientation( outline );
+ if ( orientation == FT_ORIENTATION_NONE )
+ {
+ if ( outline->n_contours )
+ return FT_Err_Invalid_Argument;
+ else
+ return FT_Err_Ok;
+ }
+
+ if ( orientation == FT_ORIENTATION_TRUETYPE )
+ rotate = -FT_ANGLE_PI2;
+ else
+ rotate = FT_ANGLE_PI2;
+
+ points = outline->points;
+
+ first = 0;
+ for ( c = 0; c < outline->n_contours; c++ )
+ {
+ int last = outline->contours[c];
+
+
+ v_first = points[first];
+ v_prev = points[last];
+ v_cur = v_first;
+
+ for ( n = first; n <= last; n++ )
+ {
+ FT_Vector in, out;
+ FT_Angle angle_diff;
+ FT_Pos d;
+ FT_Fixed scale;
+
+
+ if ( n < last )
+ v_next = points[n + 1];
+ else
+ v_next = v_first;
+
+ /* compute the in and out vectors */
+ in.x = v_cur.x - v_prev.x;
+ in.y = v_cur.y - v_prev.y;
+
+ out.x = v_next.x - v_cur.x;
+ out.y = v_next.y - v_cur.y;
+
+ angle_in = FT_Atan2( in.x, in.y );
+ angle_out = FT_Atan2( out.x, out.y );
+ angle_diff = FT_Angle_Diff( angle_in, angle_out );
+ scale = FT_Cos( angle_diff / 2 );
+
+ if ( scale < 0x4000L && scale > -0x4000L )
+ in.x = in.y = 0;
+ else
+ {
+ d = FT_DivFix( strength, scale );
+
+ FT_Vector_From_Polar( &in, d, angle_in + angle_diff / 2 - rotate );
+ }
+
+ outline->points[n].x = v_cur.x + strength + in.x;
+ outline->points[n].y = v_cur.y + strength + in.y;
+
+ v_prev = v_cur;
+ v_cur = v_next;
+ }
+
+ first = last + 1;
+ }
+
+ return FT_Err_Ok;
+ }
+
+
+ /* documentation is in ftoutln.h */
+
+ FT_EXPORT_DEF( FT_Orientation )
+ FT_Outline_Get_Orientation( FT_Outline* outline )
+ {
+ FT_Pos xmin = 32768L;
+ FT_Pos xmin_ymin = 32768L;
+ FT_Pos xmin_ymax = -32768L;
+ FT_Vector* xmin_first = NULL;
+ FT_Vector* xmin_last = NULL;
+
+ short* contour;
+
+ FT_Vector* first;
+ FT_Vector* last;
+ FT_Vector* prev;
+ FT_Vector* point;
+
+ int i;
+ FT_Pos ray_y[3];
+ FT_Orientation result[3] =
+ { FT_ORIENTATION_NONE, FT_ORIENTATION_NONE, FT_ORIENTATION_NONE };
+
+
+ if ( !outline || outline->n_points <= 0 )
+ return FT_ORIENTATION_TRUETYPE;
+
+ /* We use the nonzero winding rule to find the orientation. */
+ /* Since glyph outlines behave much more `regular' than arbitrary */
+ /* cubic or quadratic curves, this test deals with the polygon */
+ /* only which is spanned up by the control points. */
+
+ first = outline->points;
+ for ( contour = outline->contours;
+ contour < outline->contours + outline->n_contours;
+ contour++, first = last + 1 )
+ {
+ FT_Pos contour_xmin = 32768L;
+ FT_Pos contour_xmax = -32768L;
+ FT_Pos contour_ymin = 32768L;
+ FT_Pos contour_ymax = -32768L;
+
+
+ last = outline->points + *contour;
+
+ /* skip degenerate contours */
+ if ( last < first + 2 )
+ continue;
+
+ for ( point = first; point <= last; ++point )
+ {
+ if ( point->x < contour_xmin )
+ contour_xmin = point->x;
+
+ if ( point->x > contour_xmax )
+ contour_xmax = point->x;
+
+ if ( point->y < contour_ymin )
+ contour_ymin = point->y;
+
+ if ( point->y > contour_ymax )
+ contour_ymax = point->y;
+ }
+
+ if ( contour_xmin < xmin &&
+ contour_xmin != contour_xmax &&
+ contour_ymin != contour_ymax )
+ {
+ xmin = contour_xmin;
+ xmin_ymin = contour_ymin;
+ xmin_ymax = contour_ymax;
+ xmin_first = first;
+ xmin_last = last;
+ }
+ }
+
+ if ( xmin == 32768L )
+ return FT_ORIENTATION_TRUETYPE;
+
+ ray_y[0] = ( xmin_ymin * 3 + xmin_ymax ) >> 2;
+ ray_y[1] = ( xmin_ymin + xmin_ymax ) >> 1;
+ ray_y[2] = ( xmin_ymin + xmin_ymax * 3 ) >> 2;
+
+ for ( i = 0; i < 3; i++ )
+ {
+ FT_Pos left_x;
+ FT_Pos right_x;
+ FT_Vector* left1;
+ FT_Vector* left2;
+ FT_Vector* right1;
+ FT_Vector* right2;
+
+
+ RedoRay:
+ left_x = 32768L;
+ right_x = -32768L;
+
+ left1 = left2 = right1 = right2 = NULL;
+
+ prev = xmin_last;
+ for ( point = xmin_first; point <= xmin_last; prev = point, ++point )
+ {
+ FT_Pos tmp_x;
+
+
+ if ( point->y == ray_y[i] || prev->y == ray_y[i] )
+ {
+ ray_y[i]++;
+ goto RedoRay;
+ }
+
+ if ( ( point->y < ray_y[i] && prev->y < ray_y[i] ) ||
+ ( point->y > ray_y[i] && prev->y > ray_y[i] ) )
+ continue;
+
+ tmp_x = FT_MulDiv( point->x - prev->x,
+ ray_y[i] - prev->y,
+ point->y - prev->y ) + prev->x;
+
+ if ( tmp_x < left_x )
+ {
+ left_x = tmp_x;
+ left1 = prev;
+ left2 = point;
+ }
+
+ if ( tmp_x > right_x )
+ {
+ right_x = tmp_x;
+ right1 = prev;
+ right2 = point;
+ }
+ }
+
+ if ( left1 && right1 )
+ {
+ if ( left1->y < left2->y && right1->y > right2->y )
+ result[i] = FT_ORIENTATION_TRUETYPE;
+ else if ( left1->y > left2->y && right1->y < right2->y )
+ result[i] = FT_ORIENTATION_POSTSCRIPT;
+ else
+ result[i] = FT_ORIENTATION_NONE;
+ }
+ }
+
+ if ( result[0] != FT_ORIENTATION_NONE &&
+ ( result[0] == result[1] || result[0] == result[2] ) )
+ return result[0];
+
+ if ( result[1] != FT_ORIENTATION_NONE && result[1] == result[2] )
+ return result[1];
+
+ return FT_ORIENTATION_TRUETYPE;
+ }
+
+
+/* END */