+++ /dev/null
-/***************************************************************************/
-/* */
-/* ftoutln.c */
-/* */
-/* FreeType outline management (body). */
-/* */
-/* Copyright 1996-2000 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 <freetype/ftoutln.h>
-#include <freetype/internal/ftobjs.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 };
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* FT_Outline_Decompose */
- /* */
- /* <Description> */
- /* Walks over an outline's structure to decompose it into individual */
- /* segments and Bezier arcs. This function is also able to emit */
- /* `move to' and `close to' operations to indicate the start and end */
- /* of new contours in the outline. */
- /* */
- /* <Input> */
- /* outline :: A pointer to the source target. */
- /* */
- /* interface :: A table of `emitters', i.e,. function pointers called */
- /* during decomposition to indicate path operations. */
- /* */
- /* user :: A typeless pointer which is passed to each emitter */
- /* during the decomposition. It can be used to store */
- /* the state during the decomposition. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means sucess. */
- /* */
- FT_EXPORT_FUNC( FT_Error ) FT_Outline_Decompose(
- FT_Outline* outline,
- FT_Outline_Funcs* 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 */
- char tag; /* current point's state */
-
- FT_Int shift;
- FT_Pos delta;
-
-
- if ( !outline || !interface )
- return FT_Err_Invalid_Argument;
-
- shift = interface->shift;
- delta = interface->delta;
- first = 0;
-
- for ( n = 0; n < outline->n_contours; n++ )
- {
- FT_Int last; /* index of last point in contour */
-
-
- last = outline->contours[n];
- limit = outline->points + last;
-
- v_start = outline->points[first];
- v_last = outline->points[last];
-
- v_start.x = SCALED( v_start.x ); v_start.y = SCALED( v_start.y );
- 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--;
- }
-
- error = 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 );
-
- error = 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 )
- {
- error = 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;
-
- error = interface->conic_to( &v_control, &v_middle, user );
- if ( error )
- goto Exit;
-
- v_control = vec;
- goto Do_Conic;
- }
-
- error = 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 );
-
- error = interface->cubic_to( &vec1, &vec2, &vec, user );
- if ( error )
- goto Exit;
- continue;
- }
-
- error = interface->cubic_to( &vec1, &vec2, &v_start, user );
- goto Close;
- }
- }
- }
-
- /* close the contour with a line segment */
- error = interface->line_to( &v_start, user );
-
- Close:
- if ( error )
- goto Exit;
-
- first = last + 1;
- }
-
- return 0;
-
- Exit:
- return error;
-
- Invalid_Outline:
- return FT_Err_Invalid_Outline;
- }
-
-
- FT_EXPORT_FUNC( FT_Error ) FT_Outline_New_Internal(
- FT_Memory memory,
- FT_UInt numPoints,
- FT_Int numContours,
- FT_Outline* outline )
- {
- FT_Error error;
-
-
- if ( !outline || !memory )
- return FT_Err_Invalid_Argument;
-
- *outline = null_outline;
-
- if ( ALLOC_ARRAY( outline->points, numPoints * 2L, FT_Pos ) ||
- ALLOC_ARRAY( outline->tags, numPoints, FT_Byte ) ||
- ALLOC_ARRAY( outline->contours, numContours, FT_UShort ) )
- goto Fail;
-
- outline->n_points = (FT_UShort)numPoints;
- outline->n_contours = (FT_Short)numContours;
- outline->flags |= ft_outline_owner;
-
- return FT_Err_Ok;
-
- Fail:
- outline->flags |= ft_outline_owner;
- FT_Outline_Done_Internal( memory, outline );
-
- return error;
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* FT_Outline_New */
- /* */
- /* <Description> */
- /* Creates a new outline of a given size. */
- /* */
- /* <Input> */
- /* library :: A handle to the library object from where the */
- /* outline is allocated. Note however that the new */
- /* outline will NOT necessarily be FREED, when */
- /* destroying the library, by FT_Done_FreeType(). */
- /* */
- /* numPoints :: The maximal number of points within the outline. */
- /* */
- /* numContours :: The maximal number of contours within the outline. */
- /* */
- /* <Output> */
- /* outline :: A handle to the new outline. NULL in case of */
- /* error. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- /* <MT-Note> */
- /* No. */
- /* */
- /* <Note> */
- /* The reason why this function takes a `library' parameter is simply */
- /* to use the library's memory allocator. */
- /* */
- FT_EXPORT_FUNC( FT_Error ) FT_Outline_New( FT_Library library,
- FT_UInt numPoints,
- FT_Int numContours,
- FT_Outline* outline )
- {
- if ( !library )
- return FT_Err_Invalid_Library_Handle;
-
- return FT_Outline_New_Internal( library->memory, numPoints,
- numContours, outline );
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* FT_Outline_Copy */
- /* */
- /* <Description> */
- /* Copies an outline into another one. Both objects must have the */
- /* same sizes (number of points & number of contours) when this */
- /* function is called. */
- /* */
- /* <Input> */
- /* source :: A handle to the source outline. */
- /* */
- /* <Output> */
- /* target :: A handle to the target outline. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- FT_EXPORT_FUNC( FT_Error ) FT_Outline_Copy( 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;
-
- MEM_Copy( target->points, source->points,
- source->n_points * sizeof ( FT_Vector ) );
-
- MEM_Copy( target->tags, source->tags,
- source->n_points * sizeof ( FT_Byte ) );
-
- MEM_Copy( target->contours, source->contours,
- source->n_contours * sizeof ( FT_Short ) );
-
- /* 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_FUNC( FT_Error ) FT_Outline_Done_Internal( FT_Memory memory,
- FT_Outline* outline )
- {
- if ( outline )
- {
- if ( outline->flags & ft_outline_owner )
- {
- FREE( outline->points );
- FREE( outline->tags );
- FREE( outline->contours );
- }
- *outline = null_outline;
-
- return FT_Err_Ok;
- }
- else
- return FT_Err_Invalid_Argument;
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* FT_Outline_Done */
- /* */
- /* <Description> */
- /* Destroys an outline created with FT_Outline_New(). */
- /* */
- /* <Input> */
- /* library :: A handle of the library object used to allocate the */
- /* outline. */
- /* */
- /* outline :: A pointer to the outline object to be discarded. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- /* <MT-Note> */
- /* No. */
- /* */
- /* <Note> */
- /* If the outline's `owner' field is not set, only the outline */
- /* descriptor will be released. */
- /* */
- /* The reason why this function takes an `outline' parameter is */
- /* simply to use FT_Free(). */
- /* */
- FT_EXPORT_FUNC( 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 );
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* FT_Outline_Get_CBox */
- /* */
- /* <Description> */
- /* Returns an outline's `control box'. The control box encloses all */
- /* the outline's points, including Bezier control points. Though it */
- /* coincides with the exact bounding box for most glyphs, it can be */
- /* slightly larger in some situations (like when rotating an outline */
- /* which contains Bezier outside arcs). */
- /* */
- /* Computing the control box is very fast, while getting the bounding */
- /* box can take much more time as it needs to walk over all segments */
- /* and arcs in the outline. To get the latter, you can use the */
- /* `ftbbox' component which is dedicated to this single task. */
- /* */
- /* <Input> */
- /* outline :: A pointer to the source outline descriptor. */
- /* */
- /* <Output> */
- /* cbox :: The outline's control box. */
- /* */
- /* <MT-Note> */
- /* Yes. */
- /* */
- FT_EXPORT_FUNC( void ) FT_Outline_Get_CBox( FT_Outline* outline,
- FT_BBox* cbox )
- {
- FT_Pos xMin, yMin, xMax, yMax;
-
-
- if ( outline && cbox )
- {
- 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;
- }
- }
- cbox->xMin = xMin;
- cbox->xMax = xMax;
- cbox->yMin = yMin;
- cbox->yMax = yMax;
- }
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* FT_Outline_Translate */
- /* */
- /* <Description> */
- /* Applies a simple translation to the points of an outline. */
- /* */
- /* <Input> */
- /* outline :: A pointer to the target outline descriptor. */
- /* */
- /* xOffset :: The horizontal offset. */
- /* */
- /* yOffset :: The vertical offset. */
- /* */
- /* <MT-Note> */
- /* Yes. */
- /* */
- FT_EXPORT_FUNC( void ) FT_Outline_Translate( FT_Outline* outline,
- FT_Pos xOffset,
- FT_Pos yOffset )
- {
- FT_UShort n;
- FT_Vector* vec = outline->points;
-
-
- for ( n = 0; n < outline->n_points; n++ )
- {
- vec->x += xOffset;
- vec->y += yOffset;
- vec++;
- }
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* FT_Outline_Reverse */
- /* */
- /* <Description> */
- /* Reverses the drawing direction of an outline. This is used to */
- /* ensure consistent fill conventions for mirrored glyphs. */
- /* */
- /* <Input> */
- /* outline :: A pointer to the target outline descriptor. */
- /* */
- /* <Note> */
- /* This functions toggles the bit flag `ft_outline_reverse_fill' in */
- /* the outline's `flags' field. */
- /* */
- FT_EXPORT_FUNC( void ) FT_Outline_Reverse( FT_Outline* outline )
- {
- FT_UShort n;
- FT_Int first, last;
-
-
- 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;
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* FT_Outline_Render */
- /* */
- /* <Description> */
- /* Renders an outline within a bitmap using the current scan-convert. */
- /* This functions uses an FT_Raster_Params structure as an argument, */
- /* allowing advanced features like direct composition, translucency, */
- /* etc. */
- /* */
- /* <Input> */
- /* library :: A handle to a FreeType library object. */
- /* */
- /* outline :: A pointer to the source outline descriptor. */
- /* */
- /* params :: A pointer to a FT_Raster_Params structure used to */
- /* describe the rendering operation. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- /* <MT-Note> */
- /* YES. Rendering is synchronized, so that concurrent calls to the */
- /* scan-line converter will be serialized. */
- /* */
- /* <Note> */
- /* You should know what you are doing and how FT_Raster_Params works */
- /* to use this function. */
- /* */
- /* The field `params.source' will be set to `outline' before the scan */
- /* converter is called, which means that the value you give to it is */
- /* actually ignored. */
- /* */
- FT_EXPORT_FUNC( FT_Error ) FT_Outline_Render( FT_Library library,
- FT_Outline* outline,
- FT_Raster_Params* params )
- {
- FT_Error error;
- FT_Bool update = 0;
- FT_Renderer renderer;
- FT_ListNode node;
-
-
- if ( !library )
- return FT_Err_Invalid_Library_Handle;
-
- if ( !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 || 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 = 1;
- }
-
- /* 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;
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* FT_Outline_Get_Bitmap */
- /* */
- /* <Description> */
- /* Renders an outline within a bitmap. The outline's image is simply */
- /* OR-ed to the target bitmap. */
- /* */
- /* <Input> */
- /* library :: A handle to a FreeType library object. */
- /* */
- /* outline :: A pointer to the source outline descriptor. */
- /* */
- /* map :: A pointer to the target bitmap descriptor. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- /* <MT-Note> */
- /* YES. Rendering is synchronized, so that concurrent calls to the */
- /* scan-line converter will be serialized. */
- /* */
- /* <Note> */
- /* This function does NOT CREATE the bitmap, it only renders an */
- /* outline image within the one you pass to it! */
- /* */
- /* It will use the raster correponding to the default glyph format. */
- /* */
- FT_EXPORT_FUNC( FT_Error ) FT_Outline_Get_Bitmap( FT_Library library,
- FT_Outline* outline,
- FT_Bitmap* bitmap )
- {
- FT_Raster_Params params;
-
-
- if ( !bitmap )
- return FT_Err_Invalid_Argument;
-
- /* other checks are delayed to FT_Outline_Render() */
-
- params.target = bitmap;
- params.flags = 0;
-
- if ( bitmap->pixel_mode == ft_pixel_mode_grays )
- params.flags |= ft_raster_flag_aa;
-
- return FT_Outline_Render( library, outline, ¶ms );
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* FT_Vector_Transform */
- /* */
- /* <Description> */
- /* Transforms a single vector through a 2x2 matrix. */
- /* */
- /* <InOut> */
- /* vector :: The target vector to transform. */
- /* */
- /* <Input> */
- /* matrix :: A pointer to the source 2x2 matrix. */
- /* */
- /* <MT-Note> */
- /* Yes. */
- /* */
- /* <Note> */
- /* The result is undefined if either `vector' or `matrix' is invalid. */
- /* */
- FT_EXPORT_FUNC( void ) FT_Vector_Transform( FT_Vector* vector,
- 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;
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* FT_Outline_Transform */
- /* */
- /* <Description> */
- /* Applies a simple 2x2 matrix to all of an outline's points. Useful */
- /* for applying rotations, slanting, flipping, etc. */
- /* */
- /* <Input> */
- /* outline :: A pointer to the target outline descriptor. */
- /* */
- /* matrix :: A pointer to the transformation matrix. */
- /* */
- /* <MT-Note> */
- /* Yes. */
- /* */
- /* <Note> */
- /* You can use FT_Outline_Translate() if you need to translate the */
- /* outline's points. */
- /* */
- FT_EXPORT_FUNC( void ) FT_Outline_Transform( FT_Outline* outline,
- FT_Matrix* matrix )
- {
- FT_Vector* vec = outline->points;
- FT_Vector* limit = vec + outline->n_points;
-
-
- for ( ; vec < limit; vec++ )
- FT_Vector_Transform( vec, matrix );
- }
-
-/* END */
git://git.jankratochvil.net / reactos.git / blobdiff