65f9516bc7
* src/base/ftlcdfil.c (ft_lcd_filter_fir, _ft_lcd_filter_legacy): Choose direction from bitmap's pixel_mode. * include/freetype/internal/ftobjs.c (FT_Bitmap_LcdFilterFunc): Updated. * src/smooth/ftsmooth.c (ft_smooth_render_generic): Updated.
504 lines
14 KiB
C
504 lines
14 KiB
C
/****************************************************************************
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*
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* ftsmooth.c
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*
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* Anti-aliasing renderer interface (body).
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*
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* Copyright (C) 2000-2019 by
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* David Turner, Robert Wilhelm, and Werner Lemberg.
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*
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* This file is part of the FreeType project, and may only be used,
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* modified, and distributed under the terms of the FreeType project
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* license, LICENSE.TXT. By continuing to use, modify, or distribute
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* this file you indicate that you have read the license and
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* understand and accept it fully.
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*
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*/
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#include <ft2build.h>
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_OBJECTS_H
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#include FT_OUTLINE_H
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#include "ftsmooth.h"
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#include "ftgrays.h"
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#include "ftsmerrs.h"
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/* initialize renderer -- init its raster */
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static FT_Error
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ft_smooth_init( FT_Renderer render )
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{
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#ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
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FT_Vector* sub = render->root.library->lcd_geometry;
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/* set up default subpixel geometry for striped RGB panels. */
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sub[0].x = -21;
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sub[0].y = 0;
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sub[1].x = 0;
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sub[1].y = 0;
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sub[2].x = 21;
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sub[2].y = 0;
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#elif 0 /* or else, once ClearType patents expire */
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FT_Library_SetLcdFilter( render->root.library, FT_LCD_FILTER_DEFAULT );
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#endif
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render->clazz->raster_class->raster_reset( render->raster, NULL, 0 );
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return 0;
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}
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/* sets render-specific mode */
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static FT_Error
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ft_smooth_set_mode( FT_Renderer render,
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FT_ULong mode_tag,
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FT_Pointer data )
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{
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/* we simply pass it to the raster */
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return render->clazz->raster_class->raster_set_mode( render->raster,
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mode_tag,
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data );
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}
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/* transform a given glyph image */
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static FT_Error
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ft_smooth_transform( FT_Renderer render,
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FT_GlyphSlot slot,
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const FT_Matrix* matrix,
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const FT_Vector* delta )
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{
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FT_Error error = FT_Err_Ok;
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if ( slot->format != render->glyph_format )
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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if ( matrix )
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FT_Outline_Transform( &slot->outline, matrix );
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if ( delta )
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FT_Outline_Translate( &slot->outline, delta->x, delta->y );
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Exit:
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return error;
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}
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/* return the glyph's control box */
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static void
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ft_smooth_get_cbox( FT_Renderer render,
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FT_GlyphSlot slot,
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FT_BBox* cbox )
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{
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FT_ZERO( cbox );
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if ( slot->format == render->glyph_format )
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FT_Outline_Get_CBox( &slot->outline, cbox );
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}
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/* convert a slot's glyph image into a bitmap */
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static FT_Error
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ft_smooth_render_generic( FT_Renderer render,
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FT_GlyphSlot slot,
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FT_Render_Mode mode,
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const FT_Vector* origin,
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FT_Render_Mode required_mode )
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{
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FT_Error error = FT_Err_Ok;
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FT_Outline* outline = &slot->outline;
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FT_Bitmap* bitmap = &slot->bitmap;
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FT_Memory memory = render->root.memory;
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FT_Pos x_shift = 0;
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FT_Pos y_shift = 0;
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FT_Int hmul = ( mode == FT_RENDER_MODE_LCD );
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FT_Int vmul = ( mode == FT_RENDER_MODE_LCD_V );
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FT_Raster_Params params;
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/* check glyph image format */
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if ( slot->format != render->glyph_format )
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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/* check mode */
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if ( mode != required_mode )
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{
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error = FT_THROW( Cannot_Render_Glyph );
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goto Exit;
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}
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/* release old bitmap buffer */
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if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
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{
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FT_FREE( bitmap->buffer );
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slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
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}
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if ( ft_glyphslot_preset_bitmap( slot, mode, origin ) )
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{
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error = FT_THROW( Raster_Overflow );
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goto Exit;
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}
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/* allocate new one */
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if ( FT_ALLOC_MULT( bitmap->buffer, bitmap->rows, bitmap->pitch ) )
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goto Exit;
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slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
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x_shift = 64 * -slot->bitmap_left;
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y_shift = 64 * -slot->bitmap_top;
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if ( bitmap->pixel_mode == FT_PIXEL_MODE_LCD_V )
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y_shift += 64 * (FT_Int)bitmap->rows / 3;
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else
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y_shift += 64 * (FT_Int)bitmap->rows;
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if ( origin )
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{
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x_shift += origin->x;
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y_shift += origin->y;
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}
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/* translate outline to render it into the bitmap */
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if ( x_shift || y_shift )
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FT_Outline_Translate( outline, x_shift, y_shift );
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/* set up parameters */
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params.target = bitmap;
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params.source = outline;
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params.flags = FT_RASTER_FLAG_AA;
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#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
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/* implode outline if needed */
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{
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FT_Vector* points = outline->points;
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FT_Vector* points_end = points + outline->n_points;
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FT_Vector* vec;
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if ( hmul )
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for ( vec = points; vec < points_end; vec++ )
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vec->x *= 3;
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if ( vmul )
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for ( vec = points; vec < points_end; vec++ )
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vec->y *= 3;
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}
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/* render outline into the bitmap */
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error = render->raster_render( render->raster, ¶ms );
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/* deflate outline if needed */
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{
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FT_Vector* points = outline->points;
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FT_Vector* points_end = points + outline->n_points;
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FT_Vector* vec;
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if ( hmul )
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for ( vec = points; vec < points_end; vec++ )
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vec->x /= 3;
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if ( vmul )
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for ( vec = points; vec < points_end; vec++ )
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vec->y /= 3;
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}
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if ( error )
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goto Exit;
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/* finally apply filtering */
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if ( hmul || vmul )
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{
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FT_Byte* lcd_weights;
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FT_Bitmap_LcdFilterFunc lcd_filter_func;
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/* Per-face LCD filtering takes priority if set up. */
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if ( slot->face && slot->face->internal->lcd_filter_func )
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{
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lcd_weights = slot->face->internal->lcd_weights;
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lcd_filter_func = slot->face->internal->lcd_filter_func;
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}
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else
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{
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lcd_weights = slot->library->lcd_weights;
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lcd_filter_func = slot->library->lcd_filter_func;
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}
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if ( lcd_filter_func )
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lcd_filter_func( bitmap, lcd_weights );
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}
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#else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
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if ( hmul ) /* lcd */
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{
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FT_Byte* line;
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FT_Byte* temp = NULL;
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FT_UInt i, j;
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unsigned int height = bitmap->rows;
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unsigned int width = bitmap->width;
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int pitch = bitmap->pitch;
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FT_Vector* sub = slot->library->lcd_geometry;
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/* Render 3 separate monochrome bitmaps, shifting the outline. */
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width /= 3;
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FT_Outline_Translate( outline,
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-sub[0].x,
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-sub[0].y );
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error = render->raster_render( render->raster, ¶ms );
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if ( error )
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goto Exit;
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bitmap->buffer += width;
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FT_Outline_Translate( outline,
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sub[0].x - sub[1].x,
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sub[0].y - sub[1].y );
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error = render->raster_render( render->raster, ¶ms );
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bitmap->buffer -= width;
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if ( error )
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goto Exit;
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bitmap->buffer += 2 * width;
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FT_Outline_Translate( outline,
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sub[1].x - sub[2].x,
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sub[1].y - sub[2].y );
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error = render->raster_render( render->raster, ¶ms );
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bitmap->buffer -= 2 * width;
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if ( error )
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goto Exit;
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x_shift -= sub[2].x;
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y_shift -= sub[2].y;
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/* XXX: Rearrange the bytes according to FT_PIXEL_MODE_LCD. */
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/* XXX: It is more efficient to render every third byte above. */
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if ( FT_ALLOC( temp, (FT_ULong)pitch ) )
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goto Exit;
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for ( i = 0; i < height; i++ )
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{
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line = bitmap->buffer + i * (FT_ULong)pitch;
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for ( j = 0; j < width; j++ )
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{
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temp[3 * j ] = line[j];
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temp[3 * j + 1] = line[j + width];
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temp[3 * j + 2] = line[j + width + width];
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}
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FT_MEM_COPY( line, temp, pitch );
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}
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FT_FREE( temp );
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}
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else if ( vmul ) /* lcd_v */
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{
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int pitch = bitmap->pitch;
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FT_Vector* sub = slot->library->lcd_geometry;
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/* Render 3 separate monochrome bitmaps, shifting the outline. */
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/* Notice that the subpixel geometry vectors are rotated. */
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/* Triple the pitch to render on each third row. */
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bitmap->pitch *= 3;
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bitmap->rows /= 3;
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FT_Outline_Translate( outline,
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-sub[0].y,
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sub[0].x );
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error = render->raster_render( render->raster, ¶ms );
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if ( error )
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goto Exit;
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bitmap->buffer += pitch;
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FT_Outline_Translate( outline,
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sub[0].y - sub[1].y,
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sub[1].x - sub[0].x );
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error = render->raster_render( render->raster, ¶ms );
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bitmap->buffer -= pitch;
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if ( error )
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goto Exit;
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bitmap->buffer += 2 * pitch;
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FT_Outline_Translate( outline,
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sub[1].y - sub[2].y,
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sub[2].x - sub[1].x );
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error = render->raster_render( render->raster, ¶ms );
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bitmap->buffer -= 2 * pitch;
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if ( error )
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goto Exit;
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x_shift -= sub[2].y;
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y_shift += sub[2].x;
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bitmap->pitch /= 3;
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bitmap->rows *= 3;
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}
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else /* grayscale */
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error = render->raster_render( render->raster, ¶ms );
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#endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
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Exit:
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if ( !error )
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{
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/* everything is fine; the glyph is now officially a bitmap */
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slot->format = FT_GLYPH_FORMAT_BITMAP;
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}
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else if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
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{
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FT_FREE( bitmap->buffer );
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slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
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}
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if ( x_shift || y_shift )
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FT_Outline_Translate( outline, -x_shift, -y_shift );
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return error;
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}
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/* convert a slot's glyph image into a bitmap */
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static FT_Error
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ft_smooth_render( FT_Renderer render,
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FT_GlyphSlot slot,
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FT_Render_Mode mode,
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const FT_Vector* origin )
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{
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if ( mode == FT_RENDER_MODE_LIGHT )
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mode = FT_RENDER_MODE_NORMAL;
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return ft_smooth_render_generic( render, slot, mode, origin,
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FT_RENDER_MODE_NORMAL );
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}
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/* convert a slot's glyph image into a horizontal LCD bitmap */
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static FT_Error
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ft_smooth_render_lcd( FT_Renderer render,
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FT_GlyphSlot slot,
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FT_Render_Mode mode,
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const FT_Vector* origin )
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{
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return ft_smooth_render_generic( render, slot, mode, origin,
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FT_RENDER_MODE_LCD );
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}
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/* convert a slot's glyph image into a vertical LCD bitmap */
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static FT_Error
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ft_smooth_render_lcd_v( FT_Renderer render,
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FT_GlyphSlot slot,
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FT_Render_Mode mode,
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const FT_Vector* origin )
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{
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return ft_smooth_render_generic( render, slot, mode, origin,
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FT_RENDER_MODE_LCD_V );
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}
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FT_DEFINE_RENDERER(
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ft_smooth_renderer_class,
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FT_MODULE_RENDERER,
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sizeof ( FT_RendererRec ),
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"smooth",
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0x10000L,
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0x20000L,
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NULL, /* module specific interface */
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(FT_Module_Constructor)ft_smooth_init, /* module_init */
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(FT_Module_Destructor) NULL, /* module_done */
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(FT_Module_Requester) NULL, /* get_interface */
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FT_GLYPH_FORMAT_OUTLINE,
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(FT_Renderer_RenderFunc) ft_smooth_render, /* render_glyph */
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(FT_Renderer_TransformFunc)ft_smooth_transform, /* transform_glyph */
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(FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox, /* get_glyph_cbox */
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(FT_Renderer_SetModeFunc) ft_smooth_set_mode, /* set_mode */
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(FT_Raster_Funcs*)&ft_grays_raster /* raster_class */
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)
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FT_DEFINE_RENDERER(
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ft_smooth_lcd_renderer_class,
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FT_MODULE_RENDERER,
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sizeof ( FT_RendererRec ),
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"smooth-lcd",
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0x10000L,
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0x20000L,
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NULL, /* module specific interface */
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(FT_Module_Constructor)ft_smooth_init, /* module_init */
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(FT_Module_Destructor) NULL, /* module_done */
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(FT_Module_Requester) NULL, /* get_interface */
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FT_GLYPH_FORMAT_OUTLINE,
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(FT_Renderer_RenderFunc) ft_smooth_render_lcd, /* render_glyph */
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(FT_Renderer_TransformFunc)ft_smooth_transform, /* transform_glyph */
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(FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox, /* get_glyph_cbox */
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(FT_Renderer_SetModeFunc) ft_smooth_set_mode, /* set_mode */
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(FT_Raster_Funcs*)&ft_grays_raster /* raster_class */
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)
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FT_DEFINE_RENDERER(
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ft_smooth_lcdv_renderer_class,
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FT_MODULE_RENDERER,
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sizeof ( FT_RendererRec ),
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"smooth-lcdv",
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0x10000L,
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0x20000L,
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NULL, /* module specific interface */
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(FT_Module_Constructor)ft_smooth_init, /* module_init */
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(FT_Module_Destructor) NULL, /* module_done */
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(FT_Module_Requester) NULL, /* get_interface */
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FT_GLYPH_FORMAT_OUTLINE,
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(FT_Renderer_RenderFunc) ft_smooth_render_lcd_v, /* render_glyph */
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(FT_Renderer_TransformFunc)ft_smooth_transform, /* transform_glyph */
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(FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox, /* get_glyph_cbox */
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(FT_Renderer_SetModeFunc) ft_smooth_set_mode, /* set_mode */
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(FT_Raster_Funcs*)&ft_grays_raster /* raster_class */
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)
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/* END */
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