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/***************************************************************************/
/* */
/* ftsmooth.c */
/* */
/* Anti-aliasing renderer interface (body). */
/* */
/* Copyright 2000-2018 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 "ftsmerrs.h"
/* initialize renderer -- init its raster */
static FT_Error
ft_smooth_init( FT_Renderer render )
{
return 0;
}
/* 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_Err_Ok;
FT_Outline* outline = &slot->outline;
FT_Bitmap* bitmap = &slot->bitmap;
FT_Memory memory = render->root.memory;
FT_Pos x_shift = 0;
FT_Pos y_shift = 0;
FT_Raster_Params params;
/* check glyph image format */
if ( slot->format != FT_GLYPH_FORMAT_OUTLINE )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
/* check mode */
if ( mode != required_mode )
{
error = FT_THROW( Cannot_Render_Glyph );
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;
}
ft_glyphslot_preset_bitmap( slot, mode, origin );
/* allocate new one */
if ( FT_ALLOC_MULT( bitmap->buffer, bitmap->rows, bitmap->pitch ) )
goto Exit;
slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
x_shift = 64 * -slot->bitmap_left;
y_shift = 64 * -slot->bitmap_top;
y_shift += 64 * (FT_Int)bitmap->rows;
if ( origin )
{
x_shift += origin->x;
y_shift += origin->y;
}
/* translate outline to render it into the bitmap */
if ( x_shift || y_shift )
FT_Outline_Translate( outline, x_shift, y_shift );
/* set up parameters */
params.target = bitmap;
params.source = outline;
params.flags = FT_RASTER_FLAG_AA;
/* grayscale */
error = render->raster_render( ¶ms );
Exit:
if ( !error )
{
/* everything is fine; the glyph is now officially a bitmap */
slot->format = FT_GLYPH_FORMAT_BITMAP;
}
else if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
{
FT_FREE( bitmap->buffer );
slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
}
if ( x_shift || y_shift )
FT_Outline_Translate( outline, -x_shift, -y_shift );
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 );
}
FT_DEFINE_RENDERER(
ft_smooth_renderer_class,
FT_MODULE_RENDERER,
sizeof ( FT_RendererRec ),
"smooth",
0x10000L,
0x20000L,
NULL, /* module specific interface */
(FT_Module_Constructor)ft_smooth_init, /* module_init */
(FT_Module_Destructor) NULL, /* module_done */
(FT_Module_Requester) NULL, /* get_interface */
(FT_Renderer_RenderFunc) ft_smooth_render, /* render_glyph */
(FT_Raster_Funcs*)&ft_grays_raster /* raster_class */
)
/* END */
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