/***************************************************************************/ | |
/* */ | |
/* ftrend1.c */ | |
/* */ | |
/* The FreeType glyph rasterizer interface (body). */ | |
/* */ | |
/* Copyright 1996-2015 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 */ |