ref: c8b187f9db503465460d8bafa2d7a758bbcf59ca
dir: /libfreetype/ftsmooth.c/
/***************************************************************************/ /* */ /* 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 */