| /***************************************************************************/ |
| /* */ |
| /* ftsmooth.c */ |
| /* */ |
| /* Anti-aliasing renderer interface (body). */ |
| /* */ |
| /* Copyright 2000-2015 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_DEBUG_H |
| #include FT_INTERNAL_OBJECTS_H |
| #include FT_OUTLINE_H |
| #include "ftsmooth.h" |
| #include "ftgrays.h" |
| #include "ftspic.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, |
| const FT_Matrix* matrix, |
| const FT_Vector* delta ) |
| { |
| FT_Error error = FT_Err_Ok; |
| |
| |
| if ( slot->format != render->glyph_format ) |
| { |
| error = FT_THROW( 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, |
| const FT_Vector* origin, |
| FT_Render_Mode required_mode ) |
| { |
| FT_Error error; |
| FT_Outline* outline = &slot->outline; |
| FT_Bitmap* bitmap = &slot->bitmap; |
| FT_Memory memory = render->root.memory; |
| FT_BBox cbox; |
| FT_Pos x_shift = 0; |
| FT_Pos y_shift = 0; |
| FT_Pos x_left, y_top; |
| FT_Pos width, height, pitch; |
| #ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING |
| FT_Pos height_org, width_org; |
| #endif |
| FT_Int hmul = mode == FT_RENDER_MODE_LCD; |
| FT_Int vmul = mode == FT_RENDER_MODE_LCD_V; |
| |
| FT_Raster_Params params; |
| |
| FT_Bool have_outline_shifted = FALSE; |
| FT_Bool have_buffer = FALSE; |
| |
| |
| /* check glyph image format */ |
| if ( slot->format != render->glyph_format ) |
| { |
| error = FT_THROW( Invalid_Argument ); |
| goto Exit; |
| } |
| |
| /* check mode */ |
| if ( mode != required_mode ) |
| { |
| error = FT_THROW( Cannot_Render_Glyph ); |
| goto Exit; |
| } |
| |
| if ( origin ) |
| { |
| x_shift = origin->x; |
| y_shift = origin->y; |
| } |
| |
| /* compute the control box, and grid fit it */ |
| /* taking into account the origin shift */ |
| FT_Outline_Get_CBox( outline, &cbox ); |
| |
| cbox.xMin = FT_PIX_FLOOR( cbox.xMin + x_shift ); |
| cbox.yMin = FT_PIX_FLOOR( cbox.yMin + y_shift ); |
| cbox.xMax = FT_PIX_CEIL( cbox.xMax + x_shift ); |
| cbox.yMax = FT_PIX_CEIL( cbox.yMax + y_shift ); |
| |
| x_shift -= cbox.xMin; |
| y_shift -= cbox.yMin; |
| |
| x_left = cbox.xMin >> 6; |
| y_top = cbox.yMax >> 6; |
| |
| width = (FT_ULong)( cbox.xMax - cbox.xMin ) >> 6; |
| height = (FT_ULong)( cbox.yMax - cbox.yMin ) >> 6; |
| |
| #ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING |
| width_org = width; |
| height_org = height; |
| #endif |
| |
| pitch = width; |
| if ( hmul ) |
| { |
| width *= 3; |
| pitch = FT_PAD_CEIL( width, 4 ); |
| } |
| |
| if ( vmul ) |
| height *= 3; |
| |
| #ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING |
| |
| if ( slot->library->lcd_filter_func ) |
| { |
| FT_Int extra = slot->library->lcd_extra; |
| |
| |
| if ( hmul ) |
| { |
| x_shift += 64 * ( extra >> 1 ); |
| x_left -= extra >> 1; |
| width += 3 * extra; |
| pitch = FT_PAD_CEIL( width, 4 ); |
| } |
| |
| if ( vmul ) |
| { |
| y_shift += 64 * ( extra >> 1 ); |
| y_top += extra >> 1; |
| height += 3 * extra; |
| } |
| } |
| |
| #endif |
| |
| /* |
| * XXX: on 16bit system, we return an error for huge bitmap |
| * to prevent an overflow. |
| */ |
| if ( x_left > FT_INT_MAX || y_top > FT_INT_MAX || |
| x_left < FT_INT_MIN || y_top < FT_INT_MIN ) |
| { |
| error = FT_THROW( Invalid_Pixel_Size ); |
| goto Exit; |
| } |
| |
| /* Required check is (pitch * height < FT_ULONG_MAX), */ |
| /* but we care realistic cases only. Always pitch <= width. */ |
| if ( width > 0x7FFF || height > 0x7FFF ) |
| { |
| FT_ERROR(( "ft_smooth_render_generic: glyph too large: %u x %u\n", |
| width, height )); |
| error = FT_THROW( Raster_Overflow ); |
| goto Exit; |
| } |
| |
| /* release old bitmap buffer */ |
| if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) |
| { |
| FT_FREE( bitmap->buffer ); |
| slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; |
| } |
| |
| /* allocate new one */ |
| if ( FT_ALLOC( bitmap->buffer, (FT_ULong)( pitch * height ) ) ) |
| goto Exit; |
| else |
| have_buffer = TRUE; |
| |
| slot->internal->flags |= FT_GLYPH_OWN_BITMAP; |
| |
| slot->format = FT_GLYPH_FORMAT_BITMAP; |
| slot->bitmap_left = (FT_Int)x_left; |
| slot->bitmap_top = (FT_Int)y_top; |
| |
| bitmap->pixel_mode = FT_PIXEL_MODE_GRAY; |
| bitmap->num_grays = 256; |
| bitmap->width = (unsigned int)width; |
| bitmap->rows = (unsigned int)height; |
| bitmap->pitch = pitch; |
| |
| /* translate outline to render it into the bitmap */ |
| if ( x_shift || y_shift ) |
| { |
| FT_Outline_Translate( outline, x_shift, y_shift ); |
| have_outline_shifted = TRUE; |
| } |
| |
| /* set up parameters */ |
| params.target = bitmap; |
| params.source = outline; |
| params.flags = FT_RASTER_FLAG_AA; |
| |
| #ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING |
| |
| /* implode outline if needed */ |
| { |
| FT_Vector* points = outline->points; |
| FT_Vector* points_end = points + outline->n_points; |
| FT_Vector* vec; |
| |
| |
| if ( hmul ) |
| for ( vec = points; vec < points_end; vec++ ) |
| vec->x *= 3; |
| |
| if ( vmul ) |
| for ( vec = points; vec < points_end; vec++ ) |
| vec->y *= 3; |
| } |
| |
| /* render outline into the bitmap */ |
| error = render->raster_render( render->raster, ¶ms ); |
| |
| /* deflate outline if needed */ |
| { |
| FT_Vector* points = outline->points; |
| FT_Vector* points_end = points + outline->n_points; |
| FT_Vector* vec; |
| |
| |
| if ( hmul ) |
| for ( vec = points; vec < points_end; vec++ ) |
| vec->x /= 3; |
| |
| if ( vmul ) |
| for ( vec = points; vec < points_end; vec++ ) |
| vec->y /= 3; |
| } |
| |
| if ( error ) |
| goto Exit; |
| |
| if ( slot->library->lcd_filter_func ) |
| slot->library->lcd_filter_func( bitmap, mode, slot->library ); |
| |
| #else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */ |
| |
| /* render outline into bitmap */ |
| error = render->raster_render( render->raster, ¶ms ); |
| if ( error ) |
| goto Exit; |
| |
| /* expand it horizontally */ |
| if ( hmul ) |
| { |
| FT_Byte* line = bitmap->buffer; |
| FT_UInt hh; |
| |
| |
| for ( hh = height_org; hh > 0; hh--, line += pitch ) |
| { |
| FT_UInt xx; |
| FT_Byte* end = line + width; |
| |
| |
| for ( xx = width_org; xx > 0; xx-- ) |
| { |
| FT_UInt pixel = line[xx-1]; |
| |
| |
| end[-3] = (FT_Byte)pixel; |
| end[-2] = (FT_Byte)pixel; |
| end[-1] = (FT_Byte)pixel; |
| end -= 3; |
| } |
| } |
| } |
| |
| /* expand it vertically */ |
| if ( vmul ) |
| { |
| FT_Byte* read = bitmap->buffer + ( height - height_org ) * pitch; |
| FT_Byte* write = bitmap->buffer; |
| FT_UInt hh; |
| |
| |
| for ( hh = height_org; hh > 0; hh-- ) |
| { |
| ft_memcpy( write, read, pitch ); |
| write += pitch; |
| |
| ft_memcpy( write, read, pitch ); |
| write += pitch; |
| |
| ft_memcpy( write, read, pitch ); |
| write += pitch; |
| read += pitch; |
| } |
| } |
| |
| #endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */ |
| |
| /* everything is fine; don't deallocate buffer */ |
| have_buffer = FALSE; |
| |
| error = FT_Err_Ok; |
| |
| Exit: |
| if ( have_outline_shifted ) |
| FT_Outline_Translate( outline, -x_shift, -y_shift ); |
| if ( have_buffer ) |
| { |
| FT_FREE( bitmap->buffer ); |
| slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; |
| } |
| |
| 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, |
| const FT_Vector* origin ) |
| { |
| if ( mode == FT_RENDER_MODE_LIGHT ) |
| mode = FT_RENDER_MODE_NORMAL; |
| |
| return ft_smooth_render_generic( render, slot, mode, origin, |
| FT_RENDER_MODE_NORMAL ); |
| } |
| |
| |
| /* 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, |
| const FT_Vector* origin ) |
| { |
| FT_Error error; |
| |
| error = ft_smooth_render_generic( render, slot, mode, origin, |
| FT_RENDER_MODE_LCD ); |
| 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, |
| const FT_Vector* origin ) |
| { |
| FT_Error error; |
| |
| error = ft_smooth_render_generic( render, slot, mode, origin, |
| FT_RENDER_MODE_LCD_V ); |
| if ( !error ) |
| slot->bitmap.pixel_mode = FT_PIXEL_MODE_LCD_V; |
| |
| return error; |
| } |
| |
| |
| FT_DEFINE_RENDERER( 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_GET |
| ) |
| |
| |
| FT_DEFINE_RENDERER( 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_GET |
| ) |
| |
| FT_DEFINE_RENDERER( 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_GET |
| ) |
| |
| |
| /* END */ |
