ref: ce367774d20072018d46bfe26f7c7b823dfad79c
dir: /src/raster/ftrend1.c/
/***************************************************************************/
/* */
/* ftrend1.c */
/* */
/* The FreeType glyph rasterizer interface (body). */
/* */
/* Copyright 1996-2017 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 "ftrend1.h"
#include "ftraster.h"
#include "rastpic.h"
#include "rasterrs.h"
/* initialize renderer -- init its raster */
static FT_Error
ft_raster1_init( FT_Renderer render )
{
render->clazz->raster_class->raster_reset( render->raster, NULL, 0 );
return FT_Err_Ok;
}
/* set render-specific mode */
static FT_Error
ft_raster1_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_raster1_transform( FT_Renderer render,
FT_GlyphSlot slot,
const FT_Matrix* matrix,
const FT_Vector* delta )
{
FT_Error error = FT_Err_Ok;
if ( slot->format != render->glyph_format )
{
error = FT_THROW( 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_raster1_get_cbox( FT_Renderer render,
FT_GlyphSlot slot,
FT_BBox* cbox )
{
FT_ZERO( 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_raster1_render( FT_Renderer render,
FT_GlyphSlot slot,
FT_Render_Mode mode,
const FT_Vector* origin )
{
FT_Error error;
FT_Outline* outline;
FT_BBox cbox, cbox0;
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 = FT_THROW( Invalid_Argument );
goto Exit;
}
/* check rendering mode */
if ( mode != FT_RENDER_MODE_MONO )
{
/* raster1 is only capable of producing monochrome bitmaps */
return FT_THROW( 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, &cbox0 );
/* undocumented but confirmed: bbox values get rounded */
#if 1
cbox.xMin = FT_PIX_ROUND( cbox0.xMin );
cbox.yMin = FT_PIX_ROUND( cbox0.yMin );
cbox.xMax = FT_PIX_ROUND( cbox0.xMax );
cbox.yMax = FT_PIX_ROUND( cbox0.yMax );
#else
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 );
#endif
/* If either `width' or `height' round to 0, try */
/* explicitly rounding up/down. In the case of */
/* glyphs containing only one very narrow feature, */
/* this gives the drop-out compensation in the scan */
/* conversion code a chance to do its stuff. */
width = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 );
if ( width == 0 )
{
cbox.xMin = FT_PIX_FLOOR( cbox0.xMin );
cbox.xMax = FT_PIX_CEIL( cbox0.xMax );
width = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 );
}
height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 );
if ( height == 0 )
{
cbox.yMin = FT_PIX_FLOOR( cbox0.yMin );
cbox.yMax = FT_PIX_CEIL( cbox0.yMax );
height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 );
}
if ( width > FT_USHORT_MAX || height > FT_USHORT_MAX )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
bitmap = &slot->bitmap;
memory = render->root.memory;
/* release old bitmap buffer */
if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
{
FT_FREE( bitmap->buffer );
slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
}
pitch = ( ( width + 15 ) >> 4 ) << 1;
bitmap->pixel_mode = FT_PIXEL_MODE_MONO;
bitmap->width = width;
bitmap->rows = height;
bitmap->pitch = (int)pitch;
if ( FT_ALLOC_MULT( bitmap->buffer, pitch, height ) )
goto Exit;
slot->internal->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 = 0;
/* render outline into the bitmap */
error = render->raster_render( render->raster, ¶ms );
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:
return error;
}
FT_DEFINE_RENDERER(
ft_raster1_renderer_class,
FT_MODULE_RENDERER,
sizeof ( FT_RendererRec ),
"raster1",
0x10000L,
0x20000L,
NULL, /* module specific interface */
(FT_Module_Constructor)ft_raster1_init, /* module_init */
(FT_Module_Destructor) NULL, /* module_done */
(FT_Module_Requester) NULL, /* get_interface */
FT_GLYPH_FORMAT_OUTLINE,
(FT_Renderer_RenderFunc) ft_raster1_render, /* render_glyph */
(FT_Renderer_TransformFunc)ft_raster1_transform, /* transform_glyph */
(FT_Renderer_GetCBoxFunc) ft_raster1_get_cbox, /* get_glyph_cbox */
(FT_Renderer_SetModeFunc) ft_raster1_set_mode, /* set_mode */
(FT_Raster_Funcs*)&FT_STANDARD_RASTER_GET /* raster_class */
)
/* END */