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54876
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/****************************************************************************
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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 (C) 2000-2019 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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49234
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17 |
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19 |
#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 "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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54876
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#ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
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FT_Vector* sub = render->root.library->lcd_geometry;
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/* set up default subpixel geometry for striped RGB panels. */
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sub[0].x = -21;
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sub[0].y = 0;
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sub[1].x = 0;
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sub[1].y = 0;
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sub[2].x = 21;
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sub[2].y = 0;
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#elif 0 /* or else, once ClearType patents expire */
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FT_Library_SetLcdFilter( render->root.library, FT_LCD_FILTER_DEFAULT );
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#endif
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49234
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53 |
render->clazz->raster_class->raster_reset( render->raster, NULL, 0 );
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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_ZERO( 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 = FT_Err_Ok;
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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_Pos x_shift = 0;
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FT_Pos y_shift = 0;
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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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/* 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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/* 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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54876
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if ( ft_glyphslot_preset_bitmap( slot, mode, origin ) )
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{
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error = FT_THROW( Raster_Overflow );
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goto Exit;
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}
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49234
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157 |
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/* allocate new one */
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if ( FT_ALLOC_MULT( bitmap->buffer, bitmap->rows, bitmap->pitch ) )
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goto Exit;
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161 |
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slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
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x_shift = 64 * -slot->bitmap_left;
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y_shift = 64 * -slot->bitmap_top;
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if ( bitmap->pixel_mode == FT_PIXEL_MODE_LCD_V )
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y_shift += 64 * (FT_Int)bitmap->rows / 3;
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else
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y_shift += 64 * (FT_Int)bitmap->rows;
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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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/* translate outline to render it into the bitmap */
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if ( x_shift || y_shift )
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FT_Outline_Translate( outline, x_shift, y_shift );
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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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185 |
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#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
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187 |
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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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206 |
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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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212 |
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213 |
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if ( hmul )
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for ( vec = points; vec < points_end; vec++ )
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216 |
vec->x /= 3;
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217 |
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218 |
if ( vmul )
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219 |
for ( vec = points; vec < points_end; vec++ )
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220 |
vec->y /= 3;
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}
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222 |
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223 |
if ( error )
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goto Exit;
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225 |
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226 |
/* finally apply filtering */
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227 |
if ( hmul || vmul )
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{
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229 |
FT_Byte* lcd_weights;
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230 |
FT_Bitmap_LcdFilterFunc lcd_filter_func;
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231 |
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232 |
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233 |
/* Per-face LCD filtering takes priority if set up. */
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234 |
if ( slot->face && slot->face->internal->lcd_filter_func )
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{
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236 |
lcd_weights = slot->face->internal->lcd_weights;
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237 |
lcd_filter_func = slot->face->internal->lcd_filter_func;
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238 |
}
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239 |
else
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240 |
{
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241 |
lcd_weights = slot->library->lcd_weights;
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242 |
lcd_filter_func = slot->library->lcd_filter_func;
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243 |
}
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244 |
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245 |
if ( lcd_filter_func )
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246 |
lcd_filter_func( bitmap, mode, lcd_weights );
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247 |
}
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248 |
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249 |
#else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
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250 |
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251 |
if ( hmul ) /* lcd */
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252 |
{
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253 |
FT_Byte* line;
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254 |
FT_Byte* temp = NULL;
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255 |
FT_UInt i, j;
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256 |
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257 |
unsigned int height = bitmap->rows;
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258 |
unsigned int width = bitmap->width;
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259 |
int pitch = bitmap->pitch;
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260 |
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54876
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261 |
FT_Vector* sub = slot->library->lcd_geometry;
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49234
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262 |
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54876
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263 |
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264 |
/* Render 3 separate monochrome bitmaps, shifting the outline. */
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49234
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265 |
width /= 3;
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266 |
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54876
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267 |
FT_Outline_Translate( outline,
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268 |
-sub[0].x,
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269 |
-sub[0].y );
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49234
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270 |
error = render->raster_render( render->raster, ¶ms );
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271 |
if ( error )
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272 |
goto Exit;
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273 |
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274 |
bitmap->buffer += width;
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54876
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275 |
FT_Outline_Translate( outline,
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276 |
sub[0].x - sub[1].x,
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277 |
sub[0].y - sub[1].y );
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49234
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278 |
error = render->raster_render( render->raster, ¶ms );
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54876
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279 |
bitmap->buffer -= width;
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49234
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280 |
if ( error )
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281 |
goto Exit;
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282 |
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54876
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283 |
bitmap->buffer += 2 * width;
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284 |
FT_Outline_Translate( outline,
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285 |
sub[1].x - sub[2].x,
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286 |
sub[1].y - sub[2].y );
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287 |
error = render->raster_render( render->raster, ¶ms );
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49234
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288 |
bitmap->buffer -= 2 * width;
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289 |
if ( error )
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290 |
goto Exit;
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291 |
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54876
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292 |
x_shift -= sub[2].x;
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293 |
y_shift -= sub[2].y;
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294 |
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49234
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295 |
/* XXX: Rearrange the bytes according to FT_PIXEL_MODE_LCD. */
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296 |
/* XXX: It is more efficient to render every third byte above. */
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297 |
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298 |
if ( FT_ALLOC( temp, (FT_ULong)pitch ) )
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299 |
goto Exit;
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300 |
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301 |
for ( i = 0; i < height; i++ )
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302 |
{
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303 |
line = bitmap->buffer + i * (FT_ULong)pitch;
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304 |
for ( j = 0; j < width; j++ )
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305 |
{
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306 |
temp[3 * j ] = line[j];
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307 |
temp[3 * j + 1] = line[j + width];
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308 |
temp[3 * j + 2] = line[j + width + width];
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309 |
}
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310 |
FT_MEM_COPY( line, temp, pitch );
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311 |
}
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312 |
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313 |
FT_FREE( temp );
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314 |
}
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315 |
else if ( vmul ) /* lcd_v */
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316 |
{
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317 |
int pitch = bitmap->pitch;
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318 |
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54876
|
319 |
FT_Vector* sub = slot->library->lcd_geometry;
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49234
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320 |
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54876
|
321 |
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322 |
/* Render 3 separate monochrome bitmaps, shifting the outline. */
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323 |
/* Notice that the subpixel geometry vectors are rotated. */
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324 |
/* Triple the pitch to render on each third row. */
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49234
|
325 |
bitmap->pitch *= 3;
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326 |
bitmap->rows /= 3;
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327 |
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54876
|
328 |
FT_Outline_Translate( outline,
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329 |
-sub[0].y,
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330 |
sub[0].x );
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49234
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331 |
error = render->raster_render( render->raster, ¶ms );
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|
332 |
if ( error )
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|
333 |
goto Exit;
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334 |
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|
335 |
bitmap->buffer += pitch;
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54876
|
336 |
FT_Outline_Translate( outline,
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|
337 |
sub[0].y - sub[1].y,
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|
338 |
sub[1].x - sub[0].x );
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49234
|
339 |
error = render->raster_render( render->raster, ¶ms );
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54876
|
340 |
bitmap->buffer -= pitch;
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49234
|
341 |
if ( error )
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342 |
goto Exit;
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343 |
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54876
|
344 |
bitmap->buffer += 2 * pitch;
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345 |
FT_Outline_Translate( outline,
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346 |
sub[1].y - sub[2].y,
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347 |
sub[2].x - sub[1].x );
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|
348 |
error = render->raster_render( render->raster, ¶ms );
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49234
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349 |
bitmap->buffer -= 2 * pitch;
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350 |
if ( error )
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351 |
goto Exit;
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352 |
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54876
|
353 |
x_shift -= sub[2].y;
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354 |
y_shift += sub[2].x;
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355 |
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49234
|
356 |
bitmap->pitch /= 3;
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|
357 |
bitmap->rows *= 3;
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|
358 |
}
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|
359 |
else /* grayscale */
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|
360 |
error = render->raster_render( render->raster, ¶ms );
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361 |
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362 |
#endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
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|
363 |
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|
364 |
Exit:
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|
365 |
if ( !error )
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|
366 |
{
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|
367 |
/* everything is fine; the glyph is now officially a bitmap */
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|
368 |
slot->format = FT_GLYPH_FORMAT_BITMAP;
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|
369 |
}
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|
370 |
else if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
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|
371 |
{
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|
372 |
FT_FREE( bitmap->buffer );
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|
373 |
slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
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|
374 |
}
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|
375 |
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|
376 |
if ( x_shift || y_shift )
|
|
|
377 |
FT_Outline_Translate( outline, -x_shift, -y_shift );
|
|
|
378 |
|
|
|
379 |
return error;
|
|
|
380 |
}
|
|
|
381 |
|
|
|
382 |
|
|
|
383 |
/* convert a slot's glyph image into a bitmap */
|
|
|
384 |
static FT_Error
|
|
|
385 |
ft_smooth_render( FT_Renderer render,
|
|
|
386 |
FT_GlyphSlot slot,
|
|
|
387 |
FT_Render_Mode mode,
|
|
|
388 |
const FT_Vector* origin )
|
|
|
389 |
{
|
|
|
390 |
if ( mode == FT_RENDER_MODE_LIGHT )
|
|
|
391 |
mode = FT_RENDER_MODE_NORMAL;
|
|
|
392 |
|
|
|
393 |
return ft_smooth_render_generic( render, slot, mode, origin,
|
|
|
394 |
FT_RENDER_MODE_NORMAL );
|
|
|
395 |
}
|
|
|
396 |
|
|
|
397 |
|
|
|
398 |
/* convert a slot's glyph image into a horizontal LCD bitmap */
|
|
|
399 |
static FT_Error
|
|
|
400 |
ft_smooth_render_lcd( FT_Renderer render,
|
|
|
401 |
FT_GlyphSlot slot,
|
|
|
402 |
FT_Render_Mode mode,
|
|
|
403 |
const FT_Vector* origin )
|
|
|
404 |
{
|
|
|
405 |
return ft_smooth_render_generic( render, slot, mode, origin,
|
|
|
406 |
FT_RENDER_MODE_LCD );
|
|
|
407 |
}
|
|
|
408 |
|
|
|
409 |
|
|
|
410 |
/* convert a slot's glyph image into a vertical LCD bitmap */
|
|
|
411 |
static FT_Error
|
|
|
412 |
ft_smooth_render_lcd_v( FT_Renderer render,
|
|
|
413 |
FT_GlyphSlot slot,
|
|
|
414 |
FT_Render_Mode mode,
|
|
|
415 |
const FT_Vector* origin )
|
|
|
416 |
{
|
|
|
417 |
return ft_smooth_render_generic( render, slot, mode, origin,
|
|
|
418 |
FT_RENDER_MODE_LCD_V );
|
|
|
419 |
}
|
|
|
420 |
|
|
|
421 |
|
|
|
422 |
FT_DEFINE_RENDERER(
|
|
|
423 |
ft_smooth_renderer_class,
|
|
|
424 |
|
|
|
425 |
FT_MODULE_RENDERER,
|
|
|
426 |
sizeof ( FT_RendererRec ),
|
|
|
427 |
|
|
|
428 |
"smooth",
|
|
|
429 |
0x10000L,
|
|
|
430 |
0x20000L,
|
|
|
431 |
|
|
|
432 |
NULL, /* module specific interface */
|
|
|
433 |
|
|
|
434 |
(FT_Module_Constructor)ft_smooth_init, /* module_init */
|
|
|
435 |
(FT_Module_Destructor) NULL, /* module_done */
|
|
|
436 |
(FT_Module_Requester) NULL, /* get_interface */
|
|
|
437 |
|
|
|
438 |
FT_GLYPH_FORMAT_OUTLINE,
|
|
|
439 |
|
|
|
440 |
(FT_Renderer_RenderFunc) ft_smooth_render, /* render_glyph */
|
|
|
441 |
(FT_Renderer_TransformFunc)ft_smooth_transform, /* transform_glyph */
|
|
|
442 |
(FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox, /* get_glyph_cbox */
|
|
|
443 |
(FT_Renderer_SetModeFunc) ft_smooth_set_mode, /* set_mode */
|
|
|
444 |
|
|
54876
|
445 |
(FT_Raster_Funcs*)&ft_grays_raster /* raster_class */
|
|
49234
|
446 |
)
|
|
|
447 |
|
|
|
448 |
|
|
|
449 |
FT_DEFINE_RENDERER(
|
|
|
450 |
ft_smooth_lcd_renderer_class,
|
|
|
451 |
|
|
|
452 |
FT_MODULE_RENDERER,
|
|
|
453 |
sizeof ( FT_RendererRec ),
|
|
|
454 |
|
|
|
455 |
"smooth-lcd",
|
|
|
456 |
0x10000L,
|
|
|
457 |
0x20000L,
|
|
|
458 |
|
|
|
459 |
NULL, /* module specific interface */
|
|
|
460 |
|
|
|
461 |
(FT_Module_Constructor)ft_smooth_init, /* module_init */
|
|
|
462 |
(FT_Module_Destructor) NULL, /* module_done */
|
|
|
463 |
(FT_Module_Requester) NULL, /* get_interface */
|
|
|
464 |
|
|
|
465 |
FT_GLYPH_FORMAT_OUTLINE,
|
|
|
466 |
|
|
|
467 |
(FT_Renderer_RenderFunc) ft_smooth_render_lcd, /* render_glyph */
|
|
|
468 |
(FT_Renderer_TransformFunc)ft_smooth_transform, /* transform_glyph */
|
|
|
469 |
(FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox, /* get_glyph_cbox */
|
|
|
470 |
(FT_Renderer_SetModeFunc) ft_smooth_set_mode, /* set_mode */
|
|
|
471 |
|
|
54876
|
472 |
(FT_Raster_Funcs*)&ft_grays_raster /* raster_class */
|
|
49234
|
473 |
)
|
|
|
474 |
|
|
|
475 |
|
|
|
476 |
FT_DEFINE_RENDERER(
|
|
|
477 |
ft_smooth_lcdv_renderer_class,
|
|
|
478 |
|
|
|
479 |
FT_MODULE_RENDERER,
|
|
|
480 |
sizeof ( FT_RendererRec ),
|
|
|
481 |
|
|
|
482 |
"smooth-lcdv",
|
|
|
483 |
0x10000L,
|
|
|
484 |
0x20000L,
|
|
|
485 |
|
|
|
486 |
NULL, /* module specific interface */
|
|
|
487 |
|
|
|
488 |
(FT_Module_Constructor)ft_smooth_init, /* module_init */
|
|
|
489 |
(FT_Module_Destructor) NULL, /* module_done */
|
|
|
490 |
(FT_Module_Requester) NULL, /* get_interface */
|
|
|
491 |
|
|
|
492 |
FT_GLYPH_FORMAT_OUTLINE,
|
|
|
493 |
|
|
|
494 |
(FT_Renderer_RenderFunc) ft_smooth_render_lcd_v, /* render_glyph */
|
|
|
495 |
(FT_Renderer_TransformFunc)ft_smooth_transform, /* transform_glyph */
|
|
|
496 |
(FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox, /* get_glyph_cbox */
|
|
|
497 |
(FT_Renderer_SetModeFunc) ft_smooth_set_mode, /* set_mode */
|
|
|
498 |
|
|
54876
|
499 |
(FT_Raster_Funcs*)&ft_grays_raster /* raster_class */
|
|
49234
|
500 |
)
|
|
|
501 |
|
|
|
502 |
|
|
|
503 |
/* END */
|