| /***************************************************************************/ |
| /* */ |
| /* ftoutln.c */ |
| /* */ |
| /* FreeType outline management (body). */ |
| /* */ |
| /* Copyright 1996-1999 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/freetype.h> |
| #include <freetype/config/ftconfig.h> |
| #include <freetype/internal/ftobjs.h> |
| |
| 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> */ |
| /* Error code. 0 means sucess. */ |
| /* */ |
| EXPORT_FUNC(int) 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; |
| |
| int n; /* index of contour in outline */ |
| int first; /* index of first point in contour */ |
| int error; |
| char tag; /* current point's state */ |
| |
| int shift = interface->shift; |
| FT_Pos delta = interface->delta; |
| |
| first = 0; |
| |
| for ( n = 0; n < outline->n_contours; n++ ) |
| { |
| 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 -1; |
| } |
| |
| /*************************************************************************/ |
| /* */ |
| /* <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 maximum number of points within the outline. */ |
| /* */ |
| /* numContours :: The maximum 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. You can copy the source */ |
| /* code of this function, replacing allocations with `malloc()' if */ |
| /* you want to control where the objects go. */ |
| /* */ |
| BASE_FUNC(FT_Error) FT_Outline_New( FT_Library library, |
| FT_UInt numPoints, |
| FT_Int numContours, |
| FT_Outline* outline ) |
| { |
| FT_Error error; |
| FT_Memory memory; |
| |
| |
| if ( !outline ) |
| return FT_Err_Invalid_Argument; |
| |
| *outline = null_outline; |
| memory = library->memory; |
| |
| 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( library, outline ); |
| |
| return error; |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <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_Alloc()/FT_Free(). You can copy the source code */ |
| /* of this function, replacing allocations with `malloc()' in your */ |
| /* application if you want something simpler. */ |
| /* */ |
| BASE_FUNC(FT_Error) FT_Outline_Done( FT_Library library, |
| FT_Outline* outline ) |
| { |
| FT_Memory memory = library->memory; |
| |
| 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_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. */ |
| /* */ |
| BASE_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. */ |
| /* */ |
| BASE_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> */ |
| /* Reverse 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.. */ |
| /* */ |
| BASE_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_Done_GlyphZone */ |
| /* */ |
| /* <Description> */ |
| /* Deallocates a glyph zone. */ |
| /* */ |
| /* <Input> */ |
| /* zone :: pointer to the target glyph zone. */ |
| /* */ |
| BASE_FUNC(void) FT_Done_GlyphZone( FT_GlyphZone* zone ) |
| { |
| FT_Memory memory = zone->memory; |
| |
| FREE( zone->contours ); |
| FREE( zone->tags ); |
| FREE( zone->cur ); |
| FREE( zone->org ); |
| |
| zone->max_points = zone->n_points = 0; |
| zone->max_contours = zone->n_contours = 0; |
| } |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* FT_New_GlyphZone */ |
| /* */ |
| /* <Description> */ |
| /* Allocates a new glyph zone. */ |
| /* */ |
| /* <Input> */ |
| /* memory :: A handle to the current memory object. */ |
| /* */ |
| /* maxPoints :: The capacity of glyph zone in points. */ |
| /* */ |
| /* maxContours :: The capacity of glyph zone in contours. */ |
| /* */ |
| /* <Output> */ |
| /* zone :: A pointer to the target glyph zone record. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. */ |
| /* */ |
| BASE_FUNC(FT_Error) FT_New_GlyphZone( FT_Memory memory, |
| FT_UShort maxPoints, |
| FT_Short maxContours, |
| FT_GlyphZone* zone ) |
| { |
| FT_Error error; |
| |
| if (maxPoints > 0) |
| maxPoints += 2; |
| |
| MEM_Set( zone, 0, sizeof(*zone) ); |
| zone->memory = memory; |
| |
| if ( ALLOC_ARRAY( zone->org, maxPoints*2, FT_F26Dot6 ) || |
| ALLOC_ARRAY( zone->cur, maxPoints*2, FT_F26Dot6 ) || |
| ALLOC_ARRAY( zone->tags, maxPoints, FT_Byte ) || |
| ALLOC_ARRAY( zone->contours, maxContours, FT_UShort ) ) |
| { |
| FT_Done_GlyphZone(zone); |
| } |
| return error; |
| } |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* FT_Update_GlyphZone */ |
| /* */ |
| /* <Description> */ |
| /* Checks the size of a zone and reallocates it if necessary. */ |
| /* */ |
| /* <Input> */ |
| /* newPoints :: The new capacity for points. We add two slots for */ |
| /* phantom points. */ |
| /* */ |
| /* newContours :: The new capacity for contours. */ |
| /* */ |
| /* <InOut> */ |
| /* zone :: The address of the target zone. */ |
| /* */ |
| /* maxPoints :: The address of the zone's current capacity for */ |
| /* points. */ |
| /* */ |
| /* maxContours :: The address of the zone's current capacity for */ |
| /* contours. */ |
| /* */ |
| BASE_FUNC(FT_Error) FT_Update_GlyphZone( FT_GlyphZone* zone, |
| FT_UShort newPoints, |
| FT_Short newContours ) |
| { |
| FT_Error error = FT_Err_Ok; |
| FT_Memory memory = zone->memory; |
| |
| newPoints += 2; |
| if ( zone->max_points < newPoints ) |
| { |
| /* reallocate the points arrays */ |
| if ( REALLOC_ARRAY( zone->org, zone->max_points*2, newPoints*2, FT_F26Dot6 ) || |
| REALLOC_ARRAY( zone->cur, zone->max_points*2, newPoints*2, FT_F26Dot6 ) || |
| REALLOC_ARRAY( zone->tags, zone->max_points*2, newPoints, FT_Byte ) ) |
| goto Exit; |
| |
| zone->max_points = newPoints; |
| } |
| |
| if ( zone->max_contours < newContours ) |
| { |
| /* reallocate the contours array */ |
| if ( REALLOC_ARRAY( zone->contours, zone->max_contours, newContours, FT_UShort ) ) |
| goto Exit; |
| |
| zone->max_contours = newContours; |
| } |
| Exit: |
| 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. */ |
| /* */ |
| EXPORT_FUNC(FT_Error) FT_Outline_Get_Bitmap( FT_Library library, |
| FT_Outline* outline, |
| FT_Bitmap* map ) |
| { |
| FT_Error error; |
| FT_Raster raster; |
| FT_Raster_Funcs funcs; |
| FT_Raster_Params params; |
| |
| error = FT_Err_Invalid_Glyph_Format; |
| raster = FT_Get_Raster( library, ft_glyph_format_outline, &funcs ); |
| if (!raster) goto Exit; |
| |
| params.target = map; |
| params.source = outline; |
| params.flags = 0; |
| if (map->pixel_mode == ft_pixel_mode_grays) |
| params.flags |= ft_raster_flag_aa; |
| |
| error = funcs.raster_render( raster, ¶ms ); |
| Exit: |
| return error; |
| } |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* FT_Outline_Render */ |
| /* */ |
| /* <Description> */ |
| /* Renders an outline within a bitmap using the current scan-convert */ |
| /* This functions uses a FT_Raster_Params as 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 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're doing and the role of FT_Raster_Params */ |
| /* 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 it */ |
| /* is actually ignored.. */ |
| /* */ |
| EXPORT_FUNC(FT_Error) FT_Outline_Render( FT_Library library, |
| FT_Outline* outline, |
| FT_Raster_Params* params ) |
| { |
| FT_Error error; |
| FT_Raster raster; |
| FT_Raster_Funcs funcs; |
| |
| error = FT_Err_Invalid_Glyph_Format; |
| raster = FT_Get_Raster( library, ft_glyph_format_outline, &funcs ); |
| if (!raster) goto Exit; |
| |
| params->source = (void*)outline; |
| error = funcs.raster_render( raster, params ); |
| Exit: |
| return error; |
| } |
| |
| |
| |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /**** ****/ |
| /**** The following functions are not used by the font drivers ****/ |
| /**** but they are provided as a convenience for client apps. ****/ |
| /**** ****/ |
| /**** Note that they will not be compiled if the configuration ****/ |
| /**** macro FT_CONFIG_OPTION_NO_CONVENIENCE_FUNCS is defined ****/ |
| /**** ****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| #ifndef FT_CONFIG_OPTION_NO_CONVENIENCE_FUNCS |
| |
| /*************************************************************************/ |
| /* */ |
| /* <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. */ |
| /* target :: A handle to the target outline. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. */ |
| /* */ |
| BASE_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 * 2 * sizeof ( FT_Pos ) ); |
| |
| 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; |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <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. */ |
| /* */ |
| BASE_FUNC(void) FT_Outline_Transform( FT_Outline* outline, |
| FT_Matrix* matrix ) |
| { |
| FT_UShort n; |
| FT_Vector* vec; |
| |
| |
| vec = outline->points; |
| for ( n = 0; n < outline->n_points; n++ ) |
| { |
| FT_Pos x, y; |
| |
| x = FT_MulFix( vec->x, matrix->xx ) + |
| FT_MulFix( vec->y, matrix->xy ); |
| |
| y = FT_MulFix( vec->x, matrix->yx ) + |
| FT_MulFix( vec->y, matrix->yy ); |
| |
| vec->x = x; |
| vec->y = y; |
| vec++; |
| } |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <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. */ |
| /* */ |
| EXPORT_FUNC(void) FT_Vector_Transform( FT_Vector* vector, |
| FT_Matrix* matrix ) |
| { |
| FT_Pos xz, yz; |
| |
| 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_Matrix_Multiply */ |
| /* */ |
| /* <Description> */ |
| /* Performs the matrix operation `b = a*b'. */ |
| /* */ |
| /* <Input> */ |
| /* a :: A pointer to matrix `a'. */ |
| /* */ |
| /* <InOut> */ |
| /* b :: A pointer to matrix `b'. */ |
| /* */ |
| /* <MT-Note> */ |
| /* Yes. */ |
| /* */ |
| BASE_FUNC(void) FT_Matrix_Multiply( FT_Matrix* a, |
| FT_Matrix* b ) |
| { |
| FT_Fixed xx, xy, yx, yy; |
| |
| |
| xx = FT_MulFix( a->xx, b->xx ) + FT_MulFix( a->xy, b->yx ); |
| xy = FT_MulFix( a->xx, b->xy ) + FT_MulFix( a->xy, b->yy ); |
| yx = FT_MulFix( a->yx, b->xx ) + FT_MulFix( a->yy, b->yx ); |
| yy = FT_MulFix( a->yx, b->xy ) + FT_MulFix( a->yy, b->yy ); |
| |
| b->xx = xx; b->xy = xy; |
| b->yx = yx; b->yy = yy; |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* FT_Matrix_Invert */ |
| /* */ |
| /* <Description> */ |
| /* Inverts a 2x2 matrix. Returns an error if it can't be inverted. */ |
| /* */ |
| /* <InOut> */ |
| /* matrix :: A pointer to the target matrix. Remains untouched in */ |
| /* case of error. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. */ |
| /* */ |
| /* <MT-Note> */ |
| /* Yes. */ |
| /* */ |
| BASE_FUNC(FT_Error) FT_Matrix_Invert( FT_Matrix* matrix ) |
| { |
| FT_Pos delta, xx, yy; |
| |
| |
| /* compute discriminant */ |
| delta = FT_MulFix( matrix->xx, matrix->yy ) - |
| FT_MulFix( matrix->xy, matrix->yx ); |
| |
| if ( !delta ) |
| return FT_Err_Invalid_Argument; /* matrix can't be inverted */ |
| |
| matrix->xy = - FT_DivFix( matrix->xy, delta ); |
| matrix->yx = - FT_DivFix( matrix->yx, delta ); |
| |
| xx = matrix->xx; |
| yy = matrix->yy; |
| |
| matrix->xx = FT_DivFix( yy, delta ); |
| matrix->yy = FT_DivFix( xx, delta ); |
| |
| return FT_Err_Ok; |
| } |
| |
| #endif |
| |
| /* END */ |
