| /***************************************************************************/ |
| /* */ |
| /* ftsmooth.c */ |
| /* */ |
| /* Anti-aliasing renderer interface (body). */ |
| /* */ |
| /* Copyright 2000-2001, 2002 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. */ |
| /* */ |
| /***************************************************************************/ |
| |
| |
| #include <ft2build.h> |
| #include FT_INTERNAL_OBJECTS_H |
| #include FT_OUTLINE_H |
| #include "ftsmooth.h" |
| #include "ftgrays.h" |
| |
| #include "ftsmerrs.h" |
| |
| |
| /* initialize renderer -- init its raster */ |
| static FT_Error |
| ft_smooth_init( FT_Renderer render ) |
| { |
| FT_Library library = FT_MODULE_LIBRARY( render ); |
| |
| |
| render->clazz->raster_class->raster_reset( render->raster, |
| library->raster_pool, |
| library->raster_pool_size ); |
| |
| return 0; |
| } |
| |
| |
| /* sets render-specific mode */ |
| static FT_Error |
| ft_smooth_set_mode( FT_Renderer render, |
| FT_ULong mode_tag, |
| FT_Pointer data ) |
| { |
| /* we simply pass it to the raster */ |
| return render->clazz->raster_class->raster_set_mode( render->raster, |
| mode_tag, |
| data ); |
| } |
| |
| /* transform a given glyph image */ |
| static FT_Error |
| ft_smooth_transform( FT_Renderer render, |
| FT_GlyphSlot slot, |
| FT_Matrix* matrix, |
| FT_Vector* delta ) |
| { |
| FT_Error error = Smooth_Err_Ok; |
| |
| |
| if ( slot->format != render->glyph_format ) |
| { |
| error = Smooth_Err_Invalid_Argument; |
| goto Exit; |
| } |
| |
| if ( matrix ) |
| FT_Outline_Transform( &slot->outline, matrix ); |
| |
| if ( delta ) |
| FT_Outline_Translate( &slot->outline, delta->x, delta->y ); |
| |
| Exit: |
| return error; |
| } |
| |
| |
| /* return the glyph's control box */ |
| static void |
| ft_smooth_get_cbox( FT_Renderer render, |
| FT_GlyphSlot slot, |
| FT_BBox* cbox ) |
| { |
| FT_MEM_ZERO( cbox, sizeof ( *cbox ) ); |
| |
| if ( slot->format == render->glyph_format ) |
| FT_Outline_Get_CBox( &slot->outline, cbox ); |
| } |
| |
| |
| /* convert a slot's glyph image into a bitmap */ |
| static FT_Error |
| ft_smooth_render_generic( FT_Renderer render, |
| FT_GlyphSlot slot, |
| FT_Render_Mode mode, |
| FT_Vector* origin, |
| FT_Render_Mode required_mode, |
| FT_Int hmul, |
| FT_Int vmul ) |
| { |
| FT_Error error; |
| FT_Outline* outline = NULL; |
| FT_BBox cbox; |
| FT_UInt width, height, pitch; |
| FT_Bitmap* bitmap; |
| FT_Memory memory; |
| |
| FT_Raster_Params params; |
| |
| |
| /* check glyph image format */ |
| if ( slot->format != render->glyph_format ) |
| { |
| error = Smooth_Err_Invalid_Argument; |
| goto Exit; |
| } |
| |
| /* check mode */ |
| if ( mode != required_mode ) |
| return Smooth_Err_Cannot_Render_Glyph; |
| |
| outline = &slot->outline; |
| |
| /* translate the outline to the new origin if needed */ |
| if ( origin ) |
| FT_Outline_Translate( outline, origin->x, origin->y ); |
| |
| /* compute the control box, and grid fit it */ |
| FT_Outline_Get_CBox( outline, &cbox ); |
| |
| cbox.xMin &= -64; |
| cbox.yMin &= -64; |
| cbox.xMax = ( cbox.xMax + 63 ) & -64; |
| cbox.yMax = ( cbox.yMax + 63 ) & -64; |
| |
| width = ( cbox.xMax - cbox.xMin ) >> 6; |
| height = ( cbox.yMax - cbox.yMin ) >> 6; |
| bitmap = &slot->bitmap; |
| memory = render->root.memory; |
| |
| /* release old bitmap buffer */ |
| if ( slot->flags & FT_GLYPH_OWN_BITMAP ) |
| { |
| FT_FREE( bitmap->buffer ); |
| slot->flags &= ~FT_GLYPH_OWN_BITMAP; |
| } |
| |
| /* allocate new one, depends on pixel format */ |
| pitch = width; |
| if ( hmul ) |
| { |
| width = width * hmul; |
| pitch = ( width + 3 ) & -4; |
| } |
| |
| if ( vmul ) |
| height *= vmul; |
| |
| bitmap->pixel_mode = FT_PIXEL_MODE_GRAY; |
| bitmap->num_grays = 256; |
| bitmap->width = width; |
| bitmap->rows = height; |
| bitmap->pitch = pitch; |
| |
| if ( FT_ALLOC( bitmap->buffer, (FT_ULong)pitch * height ) ) |
| goto Exit; |
| |
| slot->flags |= FT_GLYPH_OWN_BITMAP; |
| |
| /* translate outline to render it into the bitmap */ |
| FT_Outline_Translate( outline, -cbox.xMin, -cbox.yMin ); |
| |
| /* set up parameters */ |
| params.target = bitmap; |
| params.source = outline; |
| params.flags = FT_RASTER_FLAG_AA; |
| |
| /* implode outline if needed */ |
| { |
| FT_Int n; |
| FT_Vector* vec; |
| |
| |
| if ( hmul ) |
| for ( vec = outline->points, n = 0; n < outline->n_points; n++, vec++ ) |
| vec->x *= hmul; |
| |
| if ( vmul ) |
| for ( vec = outline->points, n = 0; n < outline->n_points; n++, vec++ ) |
| vec->y *= vmul; |
| } |
| |
| /* render outline into the bitmap */ |
| error = render->raster_render( render->raster, ¶ms ); |
| |
| /* deflate outline if needed */ |
| { |
| FT_Int n; |
| FT_Vector* vec; |
| |
| |
| if ( hmul ) |
| for ( vec = outline->points, n = 0; n < outline->n_points; n++, vec++ ) |
| vec->x /= hmul; |
| |
| if ( vmul ) |
| for ( vec = outline->points, n = 0; n < outline->n_points; n++, vec++ ) |
| vec->y /= vmul; |
| } |
| |
| FT_Outline_Translate( outline, cbox.xMin, cbox.yMin ); |
| |
| if ( error ) |
| goto Exit; |
| |
| slot->format = FT_GLYPH_FORMAT_BITMAP; |
| slot->bitmap_left = (FT_Int)( cbox.xMin >> 6 ); |
| slot->bitmap_top = (FT_Int)( cbox.yMax >> 6 ); |
| |
| Exit: |
| if ( outline && origin ) |
| FT_Outline_Translate( outline, -origin->x, -origin->y ); |
| |
| return error; |
| } |
| |
| |
| /* convert a slot's glyph image into a bitmap */ |
| static FT_Error |
| ft_smooth_render( FT_Renderer render, |
| FT_GlyphSlot slot, |
| FT_Render_Mode mode, |
| FT_Vector* origin ) |
| { |
| return ft_smooth_render_generic( render, slot, mode, origin, |
| FT_RENDER_MODE_NORMAL, |
| 0, 0 ); |
| } |
| |
| |
| /* convert a slot's glyph image into a horizontal LCD bitmap */ |
| static FT_Error |
| ft_smooth_render_lcd( FT_Renderer render, |
| FT_GlyphSlot slot, |
| FT_Render_Mode mode, |
| FT_Vector* origin ) |
| { |
| FT_Error error; |
| |
| error = ft_smooth_render_generic( render, slot, mode, origin, |
| FT_RENDER_MODE_LCD, |
| 3, 0 ); |
| if ( !error ) |
| slot->bitmap.pixel_mode = FT_PIXEL_MODE_LCD; |
| |
| return error; |
| } |
| |
| |
| /* convert a slot's glyph image into a vertical LCD bitmap */ |
| static FT_Error |
| ft_smooth_render_lcd_v( FT_Renderer render, |
| FT_GlyphSlot slot, |
| FT_Render_Mode mode, |
| FT_Vector* origin ) |
| { |
| FT_Error error; |
| |
| error = ft_smooth_render_generic( render, slot, mode, origin, |
| FT_RENDER_MODE_LCD_V, |
| 0, 3 ); |
| if ( !error ) |
| slot->bitmap.pixel_mode = FT_PIXEL_MODE_LCD_V; |
| |
| return error; |
| } |
| |
| |
| FT_CALLBACK_TABLE_DEF |
| const FT_Renderer_Class ft_smooth_renderer_class = |
| { |
| { |
| ft_module_renderer, |
| sizeof( FT_RendererRec ), |
| |
| "smooth", |
| 0x10000L, |
| 0x20000L, |
| |
| 0, /* module specific interface */ |
| |
| (FT_Module_Constructor)ft_smooth_init, |
| (FT_Module_Destructor) 0, |
| (FT_Module_Requester) 0 |
| }, |
| |
| FT_GLYPH_FORMAT_OUTLINE, |
| |
| (FT_Renderer_RenderFunc) ft_smooth_render, |
| (FT_Renderer_TransformFunc)ft_smooth_transform, |
| (FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox, |
| (FT_Renderer_SetModeFunc) ft_smooth_set_mode, |
| |
| (FT_Raster_Funcs*) &ft_grays_raster |
| }; |
| |
| |
| FT_CALLBACK_TABLE_DEF |
| const FT_Renderer_Class ft_smooth_lcd_renderer_class = |
| { |
| { |
| ft_module_renderer, |
| sizeof( FT_RendererRec ), |
| |
| "smooth-lcd", |
| 0x10000L, |
| 0x20000L, |
| |
| 0, /* module specific interface */ |
| |
| (FT_Module_Constructor)ft_smooth_init, |
| (FT_Module_Destructor) 0, |
| (FT_Module_Requester) 0 |
| }, |
| |
| FT_GLYPH_FORMAT_OUTLINE, |
| |
| (FT_Renderer_RenderFunc) ft_smooth_render_lcd, |
| (FT_Renderer_TransformFunc)ft_smooth_transform, |
| (FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox, |
| (FT_Renderer_SetModeFunc) ft_smooth_set_mode, |
| |
| (FT_Raster_Funcs*) &ft_grays_raster |
| }; |
| |
| |
| |
| FT_CALLBACK_TABLE_DEF |
| const FT_Renderer_Class ft_smooth_lcdv_renderer_class = |
| { |
| { |
| ft_module_renderer, |
| sizeof( FT_RendererRec ), |
| |
| "smooth-lcdv", |
| 0x10000L, |
| 0x20000L, |
| |
| 0, /* module specific interface */ |
| |
| (FT_Module_Constructor)ft_smooth_init, |
| (FT_Module_Destructor) 0, |
| (FT_Module_Requester) 0 |
| }, |
| |
| FT_GLYPH_FORMAT_OUTLINE, |
| |
| (FT_Renderer_RenderFunc) ft_smooth_render_lcd_v, |
| (FT_Renderer_TransformFunc)ft_smooth_transform, |
| (FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox, |
| (FT_Renderer_SetModeFunc) ft_smooth_set_mode, |
| |
| (FT_Raster_Funcs*) &ft_grays_raster |
| }; |
| |
| |
| /* END */ |
