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path: root/third_party/freetype/src/base/ftoutln.c
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diff --git a/third_party/freetype/src/base/ftoutln.c b/third_party/freetype/src/base/ftoutln.c
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-/***************************************************************************/
-/* */
-/* ftoutln.c */
-/* */
-/* FreeType outline management (body). */
-/* */
-/* Copyright 1996-2017 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_CALC_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, NULL, NULL, NULL, 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) < 0 ? -( -(x) << shift ) \
- : ( (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 )
- return FT_THROW( Invalid_Outline );
-
- if ( !func_interface )
- return FT_THROW( 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 = (FT_UInt)last + 1;
- }
-
- FT_TRACE5(( "FT_Outline_Decompose: Done\n", n ));
- return FT_Err_Ok;
-
- Exit:
- FT_TRACE5(( "FT_Outline_Decompose: Error 0x%x\n", error ));
- return error;
-
- Invalid_Outline:
- return FT_THROW( 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_THROW( Invalid_Argument );
-
- *anoutline = null_outline;
-
- if ( numContours < 0 ||
- (FT_UInt)numContours > numPoints )
- return FT_THROW( Invalid_Argument );
-
- if ( numPoints > FT_OUTLINE_POINTS_MAX )
- return FT_THROW( Array_Too_Large );
-
- 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_Short)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_THROW( 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 FT_Err_Ok;
-
- /* 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 FT_Err_Ok;
- }
-
- Bad:
- return FT_THROW( 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 )
- return FT_THROW( Invalid_Outline );
-
- if ( source->n_points != target->n_points ||
- source->n_contours != target->n_contours )
- return FT_THROW( Invalid_Argument );
-
- if ( source == target )
- return FT_Err_Ok;
-
- if ( source->n_points )
- {
- FT_ARRAY_COPY( target->points, source->points, source->n_points );
- FT_ARRAY_COPY( target->tags, source->tags, source->n_points );
- }
-
- if ( source->n_contours )
- 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 ( !outline )
- return FT_THROW( Invalid_Outline );
-
- if ( !memory )
- return FT_THROW( Invalid_Argument );
-
- 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;
- }
-
-
- /* 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_THROW( 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;
-
-
- while ( p < q )
- {
- char swap;
-
-
- 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_Renderer renderer;
- FT_ListNode node;
-
-
- if ( !library )
- return FT_THROW( Invalid_Library_Handle );
-
- if ( !outline )
- return FT_THROW( Invalid_Outline );
-
- if ( !params )
- return FT_THROW( 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_ERR_NEQ( error, 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 );
- }
-
- 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_THROW( 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, &params );
- }
-
-
- /* 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 & 1;
- }
-
-
- 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 )
- {
- return FT_Outline_EmboldenXY( outline, strength, strength );
- }
-
-
- /* documentation is in ftoutln.h */
-
- FT_EXPORT_DEF( FT_Error )
- FT_Outline_EmboldenXY( FT_Outline* outline,
- FT_Pos xstrength,
- FT_Pos ystrength )
- {
- FT_Vector* points;
- FT_Int c, first, last;
- FT_Int orientation;
-
-
- if ( !outline )
- return FT_THROW( Invalid_Outline );
-
- xstrength /= 2;
- ystrength /= 2;
- if ( xstrength == 0 && ystrength == 0 )
- return FT_Err_Ok;
-
- orientation = FT_Outline_Get_Orientation( outline );
- if ( orientation == FT_ORIENTATION_NONE )
- {
- if ( outline->n_contours )
- return FT_THROW( Invalid_Argument );
- else
- return FT_Err_Ok;
- }
-
- points = outline->points;
-
- first = 0;
- for ( c = 0; c < outline->n_contours; c++ )
- {
- FT_Vector in, out, anchor, shift;
- FT_Fixed l_in, l_out, l_anchor = 0, l, q, d;
- FT_Int i, j, k;
-
-
- l_in = 0;
- last = outline->contours[c];
-
- /* pacify compiler */
- in.x = in.y = anchor.x = anchor.y = 0;
-
- /* Counter j cycles though the points; counter i advances only */
- /* when points are moved; anchor k marks the first moved point. */
- for ( i = last, j = first, k = -1;
- j != i && i != k;
- j = j < last ? j + 1 : first )
- {
- if ( j != k )
- {
- out.x = points[j].x - points[i].x;
- out.y = points[j].y - points[i].y;
- l_out = (FT_Fixed)FT_Vector_NormLen( &out );
-
- if ( l_out == 0 )
- continue;
- }
- else
- {
- out = anchor;
- l_out = l_anchor;
- }
-
- if ( l_in != 0 )
- {
- if ( k < 0 )
- {
- k = i;
- anchor = in;
- l_anchor = l_in;
- }
-
- d = FT_MulFix( in.x, out.x ) + FT_MulFix( in.y, out.y );
-
- /* shift only if turn is less than ~160 degrees */
- if ( d > -0xF000L )
- {
- d = d + 0x10000L;
-
- /* shift components along lateral bisector in proper orientation */
- shift.x = in.y + out.y;
- shift.y = in.x + out.x;
-
- if ( orientation == FT_ORIENTATION_TRUETYPE )
- shift.x = -shift.x;
- else
- shift.y = -shift.y;
-
- /* restrict shift magnitude to better handle collapsing segments */
- q = FT_MulFix( out.x, in.y ) - FT_MulFix( out.y, in.x );
- if ( orientation == FT_ORIENTATION_TRUETYPE )
- q = -q;
-
- l = FT_MIN( l_in, l_out );
-
- /* non-strict inequalities avoid divide-by-zero when q == l == 0 */
- if ( FT_MulFix( xstrength, q ) <= FT_MulFix( l, d ) )
- shift.x = FT_MulDiv( shift.x, xstrength, d );
- else
- shift.x = FT_MulDiv( shift.x, l, q );
-
-
- if ( FT_MulFix( ystrength, q ) <= FT_MulFix( l, d ) )
- shift.y = FT_MulDiv( shift.y, ystrength, d );
- else
- shift.y = FT_MulDiv( shift.y, l, q );
- }
- else
- shift.x = shift.y = 0;
-
- for ( ;
- i != j;
- i = i < last ? i + 1 : first )
- {
- points[i].x += xstrength + shift.x;
- points[i].y += ystrength + shift.y;
- }
- }
- else
- i = j;
-
- in = out;
- l_in = l_out;
- }
-
- 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_BBox cbox;
- FT_Int xshift, yshift;
- FT_Vector* points;
- FT_Vector v_prev, v_cur;
- FT_Int c, n, first;
- FT_Pos area = 0;
-
-
- 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 that is spanned up by the control points. */
-
- FT_Outline_Get_CBox( outline, &cbox );
-
- /* Handle collapsed outlines to avoid undefined FT_MSB. */
- if ( cbox.xMin == cbox.xMax || cbox.yMin == cbox.yMax )
- return FT_ORIENTATION_NONE;
-
- xshift = FT_MSB( (FT_UInt32)( FT_ABS( cbox.xMax ) |
- FT_ABS( cbox.xMin ) ) ) - 14;
- xshift = FT_MAX( xshift, 0 );
-
- yshift = FT_MSB( (FT_UInt32)( cbox.yMax - cbox.yMin ) ) - 14;
- yshift = FT_MAX( yshift, 0 );
-
- points = outline->points;
-
- first = 0;
- for ( c = 0; c < outline->n_contours; c++ )
- {
- FT_Int last = outline->contours[c];
-
-
- v_prev.x = points[last].x >> xshift;
- v_prev.y = points[last].y >> yshift;
-
- for ( n = first; n <= last; n++ )
- {
- v_cur.x = points[n].x >> xshift;
- v_cur.y = points[n].y >> yshift;
-
- area += ( v_cur.y - v_prev.y ) * ( v_cur.x + v_prev.x );
-
- v_prev = v_cur;
- }
-
- first = last + 1;
- }
-
- if ( area > 0 )
- return FT_ORIENTATION_POSTSCRIPT;
- else if ( area < 0 )
- return FT_ORIENTATION_TRUETYPE;
- else
- return FT_ORIENTATION_NONE;
- }
-
-
-/* END */
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-08 07:20:35 +0000