ref: 82b046f36f8084a22bbb5d71edd0edd9179561eb
dir: /libfreetype/ftsmooth.c/
/***************************************************************************/
/* */
/* ftsmooth.c */
/* */
/* Anti-aliasing renderer interface (body). */
/* */
/* Copyright 2000-2001, 2002 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,
FT_Matrix* matrix,
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,
FT_Vector* origin,
FT_Render_Mode required_mode,
FT_Int hmul,
FT_Int vmul )
{
FT_Error error;
FT_Outline* outline = NULL;
FT_BBox cbox;
FT_UInt width, height, pitch;
FT_Bitmap* bitmap;
FT_Memory memory;
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 &= -64;
cbox.yMin &= -64;
cbox.xMax = ( cbox.xMax + 63 ) & -64;
cbox.yMax = ( cbox.yMax + 63 ) & -64;
width = ( cbox.xMax - cbox.xMin ) >> 6;
height = ( cbox.yMax - cbox.yMin ) >> 6;
bitmap = &slot->bitmap;
memory = render->root.memory;
/* release old bitmap buffer */
if ( slot->flags & FT_GLYPH_OWN_BITMAP )
{
FT_FREE( bitmap->buffer );
slot->flags &= ~FT_GLYPH_OWN_BITMAP;
}
/* allocate new one, depends on pixel format */
pitch = width;
if ( hmul )
{
width = width * hmul;
pitch = ( width + 3 ) & -4;
}
if ( vmul )
height *= vmul;
bitmap->pixel_mode = FT_PIXEL_MODE_GRAY;
bitmap->num_grays = 256;
bitmap->width = width;
bitmap->rows = height;
bitmap->pitch = pitch;
if ( FT_ALLOC( bitmap->buffer, (FT_ULong)pitch * height ) )
goto Exit;
slot->flags |= FT_GLYPH_OWN_BITMAP;
/* 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;
/* 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 *= hmul;
if ( vmul )
for ( vec = outline->points, n = 0; n < outline->n_points; n++, vec++ )
vec->y *= vmul;
}
/* 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 /= hmul;
if ( vmul )
for ( vec = outline->points, n = 0; n < outline->n_points; n++, vec++ )
vec->y /= vmul;
}
FT_Outline_Translate( outline, cbox.xMin, cbox.yMin );
if ( error )
goto Exit;
slot->format = FT_GLYPH_FORMAT_BITMAP;
slot->bitmap_left = (FT_Int)( cbox.xMin >> 6 );
slot->bitmap_top = (FT_Int)( cbox.yMax >> 6 );
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,
FT_Vector* origin )
{
return ft_smooth_render_generic( render, slot, mode, origin,
FT_RENDER_MODE_NORMAL,
0, 0 );
}
/* 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,
FT_Vector* origin )
{
FT_Error error;
error = ft_smooth_render_generic( render, slot, mode, origin,
FT_RENDER_MODE_LCD,
3, 0 );
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,
FT_Vector* origin )
{
FT_Error error;
error = ft_smooth_render_generic( render, slot, mode, origin,
FT_RENDER_MODE_LCD_V,
0, 3 );
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 */