512 lines
13 KiB
C
512 lines
13 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 2000-2016 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 "ftspic.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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FT_Library library = FT_MODULE_LIBRARY( render );
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render->clazz->raster_class->raster_reset( render->raster,
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library->raster_pool,
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library->raster_pool_size );
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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_MEM_ZERO( cbox, sizeof ( *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;
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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_BBox cbox;
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FT_Pos x_shift = 0;
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FT_Pos y_shift = 0;
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FT_Pos x_left, y_top;
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FT_Pos width, height, pitch;
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#ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
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FT_Pos height_org, width_org;
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#endif
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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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FT_Bool have_outline_shifted = FALSE;
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FT_Bool have_buffer = FALSE;
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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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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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/* compute the control box, and grid fit it */
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/* taking into account the origin shift */
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FT_Outline_Get_CBox( outline, &cbox );
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cbox.xMin = FT_PIX_FLOOR( cbox.xMin + x_shift );
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cbox.yMin = FT_PIX_FLOOR( cbox.yMin + y_shift );
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cbox.xMax = FT_PIX_CEIL( cbox.xMax + x_shift );
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cbox.yMax = FT_PIX_CEIL( cbox.yMax + y_shift );
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x_shift -= cbox.xMin;
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y_shift -= cbox.yMin;
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x_left = cbox.xMin >> 6;
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y_top = cbox.yMax >> 6;
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width = (FT_ULong)( cbox.xMax - cbox.xMin ) >> 6;
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height = (FT_ULong)( cbox.yMax - cbox.yMin ) >> 6;
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#ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
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width_org = width;
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height_org = height;
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#endif
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pitch = width;
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if ( hmul )
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{
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width *= 3;
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pitch = FT_PAD_CEIL( width, 4 );
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}
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if ( vmul )
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height *= 3;
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#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
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if ( slot->library->lcd_filter_func )
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{
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FT_Int extra = slot->library->lcd_extra;
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if ( hmul )
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{
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x_shift += 64 * ( extra >> 1 );
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x_left -= extra >> 1;
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width += 3 * extra;
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pitch = FT_PAD_CEIL( width, 4 );
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}
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if ( vmul )
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{
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y_shift += 64 * ( extra >> 1 );
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y_top += extra >> 1;
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height += 3 * extra;
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}
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}
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#endif
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/*
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* XXX: on 16bit system, we return an error for huge bitmap
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* to prevent an overflow.
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*/
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if ( x_left > FT_INT_MAX || y_top > FT_INT_MAX ||
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x_left < FT_INT_MIN || y_top < FT_INT_MIN )
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{
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error = FT_THROW( Invalid_Pixel_Size );
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goto Exit;
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}
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/* Required check is (pitch * height < FT_ULONG_MAX), */
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/* but we care realistic cases only. Always pitch <= width. */
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if ( width > 0x7FFF || height > 0x7FFF )
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{
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FT_ERROR(( "ft_smooth_render_generic: glyph too large: %u x %u\n",
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width, height ));
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error = FT_THROW( Raster_Overflow );
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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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/* allocate new one */
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if ( FT_ALLOC( bitmap->buffer, (FT_ULong)( pitch * height ) ) )
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goto Exit;
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else
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have_buffer = TRUE;
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slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
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slot->format = FT_GLYPH_FORMAT_BITMAP;
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slot->bitmap_left = (FT_Int)x_left;
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slot->bitmap_top = (FT_Int)y_top;
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bitmap->pixel_mode = FT_PIXEL_MODE_GRAY;
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bitmap->num_grays = 256;
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bitmap->width = (unsigned int)width;
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bitmap->rows = (unsigned int)height;
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bitmap->pitch = pitch;
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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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{
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FT_Outline_Translate( outline, x_shift, y_shift );
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have_outline_shifted = TRUE;
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}
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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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if ( slot->library->lcd_filter_func )
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slot->library->lcd_filter_func( bitmap, mode, slot->library );
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#else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
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/* render outline into bitmap */
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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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/* expand it horizontally */
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if ( hmul )
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{
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FT_Byte* line = bitmap->buffer;
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FT_UInt hh;
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for ( hh = height_org; hh > 0; hh--, line += pitch )
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{
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FT_UInt xx;
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FT_Byte* end = line + width;
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for ( xx = width_org; xx > 0; xx-- )
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{
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FT_UInt pixel = line[xx-1];
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end[-3] = (FT_Byte)pixel;
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end[-2] = (FT_Byte)pixel;
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end[-1] = (FT_Byte)pixel;
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end -= 3;
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}
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}
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}
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/* expand it vertically */
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if ( vmul )
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{
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FT_Byte* read = bitmap->buffer + ( height - height_org ) * pitch;
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FT_Byte* write = bitmap->buffer;
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FT_UInt hh;
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for ( hh = height_org; hh > 0; hh-- )
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{
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ft_memcpy( write, read, pitch );
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write += pitch;
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ft_memcpy( write, read, pitch );
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write += pitch;
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ft_memcpy( write, read, pitch );
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write += pitch;
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read += pitch;
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}
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}
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#endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
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/* everything is fine; don't deallocate buffer */
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have_buffer = FALSE;
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error = FT_Err_Ok;
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Exit:
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if ( have_outline_shifted )
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FT_Outline_Translate( outline, -x_shift, -y_shift );
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if ( have_buffer )
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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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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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FT_Error error;
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error = ft_smooth_render_generic( render, slot, mode, origin,
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FT_RENDER_MODE_LCD );
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if ( !error )
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slot->bitmap.pixel_mode = FT_PIXEL_MODE_LCD;
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return error;
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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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FT_Error error;
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error = ft_smooth_render_generic( render, slot, mode, origin,
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FT_RENDER_MODE_LCD_V );
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if ( !error )
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slot->bitmap.pixel_mode = FT_PIXEL_MODE_LCD_V;
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return error;
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}
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FT_DEFINE_RENDERER( 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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0, /* module specific interface */
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(FT_Module_Constructor)ft_smooth_init,
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(FT_Module_Destructor) 0,
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(FT_Module_Requester) 0
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,
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FT_GLYPH_FORMAT_OUTLINE,
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(FT_Renderer_RenderFunc) ft_smooth_render,
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(FT_Renderer_TransformFunc)ft_smooth_transform,
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(FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox,
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(FT_Renderer_SetModeFunc) ft_smooth_set_mode,
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(FT_Raster_Funcs*) &FT_GRAYS_RASTER_GET
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)
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FT_DEFINE_RENDERER( 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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0, /* module specific interface */
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(FT_Module_Constructor)ft_smooth_init,
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(FT_Module_Destructor) 0,
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(FT_Module_Requester) 0
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,
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FT_GLYPH_FORMAT_OUTLINE,
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(FT_Renderer_RenderFunc) ft_smooth_render_lcd,
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(FT_Renderer_TransformFunc)ft_smooth_transform,
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(FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox,
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(FT_Renderer_SetModeFunc) ft_smooth_set_mode,
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(FT_Raster_Funcs*) &FT_GRAYS_RASTER_GET
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)
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FT_DEFINE_RENDERER( 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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0, /* module specific interface */
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(FT_Module_Constructor)ft_smooth_init,
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(FT_Module_Destructor) 0,
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(FT_Module_Requester) 0
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,
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FT_GLYPH_FORMAT_OUTLINE,
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(FT_Renderer_RenderFunc) ft_smooth_render_lcd_v,
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(FT_Renderer_TransformFunc)ft_smooth_transform,
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(FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox,
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(FT_Renderer_SetModeFunc) ft_smooth_set_mode,
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(FT_Raster_Funcs*) &FT_GRAYS_RASTER_GET
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)
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/* END */
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