freetype2/src/smooth/ftsmooth.c

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/***************************************************************************/
/* */
/* ftsmooth.c */
/* */
/* Anti-aliasing renderer interface (body). */
/* */
/* Copyright 2000 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. */
/* */
/***************************************************************************/
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#include <freetype/internal/ftobjs.h>
#include <freetype/ftoutln.h>
#ifdef FT_FLAT_COMPILE
#include "ftsmooth.h"
#include "ftgrays.h"
#else
#include <smooth/ftsmooth.h>
#include <smooth/ftgrays.h>
#endif
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/* initialize renderer -- init its raster */
static
FT_Error ft_smooth_init( FT_Renderer render )
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{
FT_Library library = FT_MODULE_LIBRARY( render );
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render->clazz->raster_class->raster_reset( render->raster,
library->raster_pool,
library->raster_pool_size );
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return 0;
}
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/* sets render-specific mode */
static
FT_Error ft_smooth_set_mode( FT_Renderer render,
FT_ULong mode_tag,
FT_Pointer data )
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{
/* we simply pass it to the raster */
return render->clazz->raster_class->raster_set_mode( render->raster,
mode_tag,
data );
}
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/* transform a given glyph image */
static
FT_Error ft_smooth_transform( FT_Renderer render,
FT_GlyphSlot slot,
FT_Matrix* matrix,
FT_Vector* delta )
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{
FT_Error error = FT_Err_Ok;
if ( slot->format != render->glyph_format )
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{
error = FT_Err_Invalid_Argument;
goto Exit;
}
if ( matrix )
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FT_Outline_Transform( &slot->outline, matrix );
if ( delta )
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FT_Outline_Translate( &slot->outline, delta->x, delta->y );
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Exit:
return error;
}
/* return the glyph's control box */
static
void ft_smooth_get_cbox( FT_Renderer render,
FT_GlyphSlot slot,
FT_BBox* cbox )
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{
MEM_Set( cbox, 0, 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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/* convert a slot's glyph image into a bitmap */
static
FT_Error ft_smooth_render( FT_Renderer render,
FT_GlyphSlot slot,
FT_UInt mode,
FT_Vector* origin )
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{
FT_Error error;
FT_Outline* outline;
FT_BBox cbox;
FT_UInt width, height, pitch;
FT_Bitmap* bitmap;
FT_Memory memory;
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FT_Raster_Params params;
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/* check glyph image format */
if ( slot->format != render->glyph_format )
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{
error = FT_Err_Invalid_Argument;
goto Exit;
}
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/* check mode */
if ( mode != ft_render_mode_normal )
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return FT_Err_Cannot_Render_Glyph;
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outline = &slot->outline;
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/* translate the outline to the new origin if needed */
if ( origin )
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FT_Outline_Translate( outline, origin->x, origin->y );
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/* compute the control box, and grid fit it */
FT_Outline_Get_CBox( outline, &cbox );
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cbox.xMin &= -64;
cbox.yMin &= -64;
cbox.xMax = ( cbox.xMax + 63 ) & -64;
cbox.yMax = ( cbox.yMax + 63 ) & -64;
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width = ( cbox.xMax - cbox.xMin ) >> 6;
height = ( cbox.yMax - cbox.yMin ) >> 6;
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bitmap = &slot->bitmap;
memory = render->root.memory;
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/* release old bitmap buffer */
if ( slot->flags & ft_glyph_own_bitmap )
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{
FREE( bitmap->buffer );
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slot->flags &= ~ft_glyph_own_bitmap;
}
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/* allocate new one, depends on pixel format */
pitch = width;
bitmap->pixel_mode = ft_pixel_mode_grays;
bitmap->num_grays = 256;
bitmap->width = width;
bitmap->rows = height;
bitmap->pitch = pitch;
if ( ALLOC( bitmap->buffer, (FT_ULong)pitch * height ) )
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goto Exit;
slot->flags |= ft_glyph_own_bitmap;
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/* 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;
/* render outline into the bitmap */
error = render->raster_render( render->raster, &params );
if ( error )
goto Exit;
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slot->format = ft_glyph_format_bitmap;
slot->bitmap_left = cbox.xMin >> 6;
slot->bitmap_top = cbox.yMax >> 6;
Exit:
return error;
}
FT_EXPORT_VAR( const FT_Renderer_Class ) ft_smooth_renderer_class =
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{
{
ft_module_renderer,
sizeof( FT_RendererRec ),
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"smooth",
0x10000L,
0x20000L,
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0, /* module specific interface */
(FT_Module_Constructor)ft_smooth_init,
(FT_Module_Destructor) 0,
(FT_Module_Requester) 0
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},
ft_glyph_format_outline,
(FTRenderer_render) ft_smooth_render,
(FTRenderer_transform)ft_smooth_transform,
(FTRenderer_getCBox) ft_smooth_get_cbox,
(FTRenderer_setMode) ft_smooth_set_mode,
(FT_Raster_Funcs*) &ft_grays_raster
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};
/* END */