ref: 87e4b339a3782f1e5dd230e4cdcd393441fc4891
dir: /src/smooth/ftsmooth.c/
/***************************************************************************/
/* */
/* ftsmooth.c */
/* */
/* Anti-aliasing renderer interface (body). */
/* */
/* Copyright 2000-2001, 2002, 2003, 2004, 2005, 2006 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_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 )
{
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 = Smooth_Err_Ok;
if ( slot->format != render->glyph_format )
{
error = Smooth_Err_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 = NULL;
FT_BBox cbox;
FT_UInt width, height, height_org, width_org, pitch;
FT_Bitmap* bitmap;
FT_Memory memory;
FT_Int hmul = (mode == FT_RENDER_MODE_LCD);
FT_Int vmul = (mode == FT_RENDER_MODE_LCD_V);
FT_Pos x_shift, y_shift, x_left, y_top;
FT_Raster_Params params;
/* check glyph image format */
if ( slot->format != render->glyph_format )
{
error = Smooth_Err_Invalid_Argument;
goto Exit;
}
/* check mode */
if ( mode != required_mode )
return Smooth_Err_Cannot_Render_Glyph;
outline = &slot->outline;
/* translate the outline to the new origin if needed */
if ( origin )
FT_Outline_Translate( outline, origin->x, origin->y );
/* compute the control box, and grid fit it */
FT_Outline_Get_CBox( outline, &cbox );
cbox.xMin = FT_PIX_FLOOR( cbox.xMin );
cbox.yMin = FT_PIX_FLOOR( cbox.yMin );
cbox.xMax = FT_PIX_CEIL( cbox.xMax );
cbox.yMax = FT_PIX_CEIL( cbox.yMax );
width = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 );
height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 );
bitmap = &slot->bitmap;
memory = render->root.memory;
width_org = width;
height_org = height;
/* 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, depends on pixel format */
pitch = width;
if ( hmul )
{
width = width * 3;
pitch = FT_PAD_CEIL( width, 4 );
}
if ( vmul )
height *= 3;
x_shift = (FT_Int) cbox.xMin;
y_shift = (FT_Int) cbox.yMin;
x_left = (FT_Int)( cbox.xMin >> 6 );
y_top = (FT_Int)( cbox.yMax >> 6 );
#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
if ( slot->library->lcd_filter )
{
if ( hmul )
{
x_shift -= 64;
width += 6;
pitch = FT_PAD_CEIL( width, 4 );
x_left -= 1;
}
if ( vmul )
{
y_shift -= 64;
height += 6;
y_top += 1;
}
}
#endif
bitmap->pixel_mode = FT_PIXEL_MODE_GRAY;
bitmap->num_grays = 256;
bitmap->width = width;
bitmap->rows = height;
bitmap->pitch = pitch;
/* translate outline to render it into the bitmap */
FT_Outline_Translate( outline, -x_shift, -y_shift );
if ( FT_ALLOC( bitmap->buffer, (FT_ULong)pitch * height ) )
goto Exit;
slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
/* 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_Int n;
FT_Vector* vec;
if ( hmul )
for ( vec = outline->points, n = 0;
n < outline->n_points;
n++, vec++ )
vec->x *= 3;
if ( vmul )
for ( vec = outline->points, n = 0;
n < outline->n_points;
n++, vec++ )
vec->y *= 3;
}
/* render outline into the bitmap */
error = render->raster_render( render->raster, ¶ms );
/* deflate outline if needed */
{
FT_Int n;
FT_Vector* vec;
if ( hmul )
for ( vec = outline->points, n = 0;
n < outline->n_points;
n++, vec++ )
vec->x /= 3;
if ( vmul )
for ( vec = outline->points, n = 0;
n < outline->n_points;
n++, vec++ )
vec->y /= 3;
}
if ( slot->library->lcd_filter )
slot->library->lcd_filter( bitmap, mode,
slot->library->lcd_filter_weights );
#else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
/* render outline into bitmap */
error = render->raster_render( render->raster, ¶ms );
/* expand it horizontally */
if ( hmul )
{
FT_Byte* line = bitmap->buffer + ( height - height_org ) * pitch;
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-- )
{
memcpy( write, read, pitch );
write += pitch;
memcpy( write, read, pitch );
write += pitch;
memcpy( write, read, pitch );
write += pitch;
read += pitch;
}
}
#endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
FT_Outline_Translate( outline, x_shift, y_shift );
if ( error )
goto Exit;
slot->format = FT_GLYPH_FORMAT_BITMAP;
slot->bitmap_left = x_left;
slot->bitmap_top = y_top;
Exit:
if ( outline && origin )
FT_Outline_Translate( outline, -origin->x, -origin->y );
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_CALLBACK_TABLE_DEF
const FT_Renderer_Class 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
};
FT_CALLBACK_TABLE_DEF
const FT_Renderer_Class 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
};
FT_CALLBACK_TABLE_DEF
const FT_Renderer_Class 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
};
/* END */