255 lines
7.3 KiB
C
255 lines
7.3 KiB
C
|
/***************************************************************************/
|
||
|
|
/* */
|
||
|
|
/* ftrend1.c */
|
||
|
|
/* */
|
||
|
|
/* The FreeType glyph rasterizer interface (body). */
|
||
|
|
/* */
|
||
|
|
/* Copyright 1996-2016 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 )
|
||
|
|
{
|
||
|
|
FT_Library library = FT_MODULE_LIBRARY( render );
|
||
|
|
|
||
|
|
|
||
|
|
render->clazz->raster_class->raster_reset( render->raster,
|
||
|
|
library->raster_pool,
|
||
|
|
library->raster_pool_size );
|
||
|
|
|
||
|
|
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_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_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,
|
||
|
|
|
||
|
|
0, /* module specific interface */
|
||
|
|
|
||
|
|
(FT_Module_Constructor)ft_raster1_init,
|
||
|
|
(FT_Module_Destructor) 0,
|
||
|
|
(FT_Module_Requester) 0
|
||
|
|
,
|
||
|
|
|
||
|
|
FT_GLYPH_FORMAT_OUTLINE,
|
||
|
|
|
||
|
|
(FT_Renderer_RenderFunc) ft_raster1_render,
|
||
|
|
(FT_Renderer_TransformFunc)ft_raster1_transform,
|
||
|
|
(FT_Renderer_GetCBoxFunc) ft_raster1_get_cbox,
|
||
|
|
(FT_Renderer_SetModeFunc) ft_raster1_set_mode,
|
||
|
|
|
||
|
|
(FT_Raster_Funcs*) &FT_STANDARD_RASTER_GET
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
/* END */
|