0,0 → 1,534 |
/***************************************************************************/ |
/* */ |
/* ftsmooth.c */ |
/* */ |
/* Anti-aliasing renderer interface (body). */ |
/* */ |
/* Copyright 2000-2006, 2009-2013 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 "ftsmooth.h" |
#include "ftgrays.h" |
#include "ftspic.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, |
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_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, |
const FT_Vector* origin, |
FT_Render_Mode required_mode ) |
{ |
FT_Error error; |
FT_Outline* outline = NULL; |
FT_BBox cbox; |
FT_Pos width, height, pitch; |
#ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING |
FT_Pos height_org, width_org; |
#endif |
FT_Bitmap* bitmap = &slot->bitmap; |
FT_Memory memory = render->root.memory; |
FT_Int hmul = mode == FT_RENDER_MODE_LCD; |
FT_Int vmul = mode == FT_RENDER_MODE_LCD_V; |
FT_Pos x_shift = 0; |
FT_Pos y_shift = 0; |
FT_Pos x_left, y_top; |
|
FT_Raster_Params params; |
|
FT_Bool have_translated_origin = FALSE; |
FT_Bool have_outline_shifted = FALSE; |
FT_Bool have_buffer = FALSE; |
|
|
/* check glyph image format */ |
if ( slot->format != render->glyph_format ) |
{ |
error = FT_THROW( Invalid_Argument ); |
goto Exit; |
} |
|
/* check mode */ |
if ( mode != required_mode ) |
{ |
error = FT_THROW( Cannot_Render_Glyph ); |
goto Exit; |
} |
|
outline = &slot->outline; |
|
/* translate the outline to the new origin if needed */ |
if ( origin ) |
{ |
FT_Outline_Translate( outline, origin->x, origin->y ); |
have_translated_origin = TRUE; |
} |
|
/* compute the control box, and grid fit it */ |
FT_Outline_Get_CBox( outline, &cbox ); |
|
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 ); |
|
if ( cbox.xMin < 0 && cbox.xMax > FT_INT_MAX + cbox.xMin ) |
{ |
FT_ERROR(( "ft_smooth_render_generic: glyph too large:" |
" xMin = %d, xMax = %d\n", |
cbox.xMin >> 6, cbox.xMax >> 6 )); |
error = FT_THROW( Raster_Overflow ); |
goto Exit; |
} |
else |
width = ( cbox.xMax - cbox.xMin ) >> 6; |
|
if ( cbox.yMin < 0 && cbox.yMax > FT_INT_MAX + cbox.yMin ) |
{ |
FT_ERROR(( "ft_smooth_render_generic: glyph too large:" |
" yMin = %d, yMax = %d\n", |
cbox.yMin >> 6, cbox.yMax >> 6 )); |
error = FT_THROW( Raster_Overflow ); |
goto Exit; |
} |
else |
height = ( cbox.yMax - cbox.yMin ) >> 6; |
|
#ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING |
width_org = width; |
height_org = height; |
#endif |
|
/* release old bitmap buffer */ |
if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) |
{ |
FT_FREE( bitmap->buffer ); |
slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; |
} |
|
/* allocate new one */ |
pitch = width; |
if ( hmul ) |
{ |
width = width * 3; |
pitch = FT_PAD_CEIL( width, 4 ); |
} |
|
if ( vmul ) |
height *= 3; |
|
x_shift = (FT_Int) cbox.xMin; |
y_shift = (FT_Int) cbox.yMin; |
x_left = (FT_Int)( cbox.xMin >> 6 ); |
y_top = (FT_Int)( cbox.yMax >> 6 ); |
|
#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING |
|
if ( slot->library->lcd_filter_func ) |
{ |
FT_Int extra = slot->library->lcd_extra; |
|
|
if ( hmul ) |
{ |
x_shift -= 64 * ( extra >> 1 ); |
width += 3 * extra; |
pitch = FT_PAD_CEIL( width, 4 ); |
x_left -= extra >> 1; |
} |
|
if ( vmul ) |
{ |
y_shift -= 64 * ( extra >> 1 ); |
height += 3 * extra; |
y_top += extra >> 1; |
} |
} |
|
#endif |
|
#if FT_UINT_MAX > 0xFFFFU |
|
/* Required check is (pitch * height < FT_ULONG_MAX), */ |
/* but we care realistic cases only. Always pitch <= width. */ |
if ( width > 0x7FFF || height > 0x7FFF ) |
{ |
FT_ERROR(( "ft_smooth_render_generic: glyph too large: %u x %u\n", |
width, height )); |
error = FT_THROW( Raster_Overflow ); |
goto Exit; |
} |
|
#endif |
|
bitmap->pixel_mode = FT_PIXEL_MODE_GRAY; |
bitmap->num_grays = 256; |
bitmap->width = width; |
bitmap->rows = height; |
bitmap->pitch = pitch; |
|
/* translate outline to render it into the bitmap */ |
FT_Outline_Translate( outline, -x_shift, -y_shift ); |
have_outline_shifted = TRUE; |
|
if ( FT_ALLOC( bitmap->buffer, (FT_ULong)pitch * height ) ) |
goto Exit; |
else |
have_buffer = TRUE; |
|
slot->internal->flags |= FT_GLYPH_OWN_BITMAP; |
|
/* set up parameters */ |
params.target = bitmap; |
params.source = outline; |
params.flags = FT_RASTER_FLAG_AA; |
|
#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING |
|
/* implode outline if needed */ |
{ |
FT_Vector* points = outline->points; |
FT_Vector* points_end = points + outline->n_points; |
FT_Vector* vec; |
|
|
if ( hmul ) |
for ( vec = points; vec < points_end; vec++ ) |
vec->x *= 3; |
|
if ( vmul ) |
for ( vec = points; vec < points_end; vec++ ) |
vec->y *= 3; |
} |
|
/* render outline into the bitmap */ |
error = render->raster_render( render->raster, ¶ms ); |
|
/* deflate outline if needed */ |
{ |
FT_Vector* points = outline->points; |
FT_Vector* points_end = points + outline->n_points; |
FT_Vector* vec; |
|
|
if ( hmul ) |
for ( vec = points; vec < points_end; vec++ ) |
vec->x /= 3; |
|
if ( vmul ) |
for ( vec = points; vec < points_end; vec++ ) |
vec->y /= 3; |
} |
|
if ( error ) |
goto Exit; |
|
if ( slot->library->lcd_filter_func ) |
slot->library->lcd_filter_func( bitmap, mode, slot->library ); |
|
#else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */ |
|
/* render outline into bitmap */ |
error = render->raster_render( render->raster, ¶ms ); |
if ( error ) |
goto Exit; |
|
/* expand it horizontally */ |
if ( hmul ) |
{ |
FT_Byte* line = bitmap->buffer; |
FT_UInt hh; |
|
|
for ( hh = height_org; hh > 0; hh--, line += pitch ) |
{ |
FT_UInt xx; |
FT_Byte* end = line + width; |
|
|
for ( xx = width_org; xx > 0; xx-- ) |
{ |
FT_UInt pixel = line[xx-1]; |
|
|
end[-3] = (FT_Byte)pixel; |
end[-2] = (FT_Byte)pixel; |
end[-1] = (FT_Byte)pixel; |
end -= 3; |
} |
} |
} |
|
/* expand it vertically */ |
if ( vmul ) |
{ |
FT_Byte* read = bitmap->buffer + ( height - height_org ) * pitch; |
FT_Byte* write = bitmap->buffer; |
FT_UInt hh; |
|
|
for ( hh = height_org; hh > 0; hh-- ) |
{ |
ft_memcpy( write, read, pitch ); |
write += pitch; |
|
ft_memcpy( write, read, pitch ); |
write += pitch; |
|
ft_memcpy( write, read, pitch ); |
write += pitch; |
read += pitch; |
} |
} |
|
#endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */ |
|
/* |
* XXX: on 16bit system, we return an error for huge bitmap |
* to prevent an overflow. |
*/ |
if ( x_left > FT_INT_MAX || y_top > FT_INT_MAX ) |
{ |
error = FT_THROW( Invalid_Pixel_Size ); |
goto Exit; |
} |
|
slot->format = FT_GLYPH_FORMAT_BITMAP; |
slot->bitmap_left = (FT_Int)x_left; |
slot->bitmap_top = (FT_Int)y_top; |
|
/* everything is fine; don't deallocate buffer */ |
have_buffer = FALSE; |
|
error = FT_Err_Ok; |
|
Exit: |
if ( have_outline_shifted ) |
FT_Outline_Translate( outline, x_shift, y_shift ); |
if ( have_translated_origin ) |
FT_Outline_Translate( outline, -origin->x, -origin->y ); |
if ( have_buffer ) |
{ |
FT_FREE( bitmap->buffer ); |
slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; |
} |
|
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, |
const FT_Vector* origin ) |
{ |
if ( mode == FT_RENDER_MODE_LIGHT ) |
mode = FT_RENDER_MODE_NORMAL; |
|
return ft_smooth_render_generic( render, slot, mode, origin, |
FT_RENDER_MODE_NORMAL ); |
} |
|
|
/* 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, |
const FT_Vector* origin ) |
{ |
FT_Error error; |
|
error = ft_smooth_render_generic( render, slot, mode, origin, |
FT_RENDER_MODE_LCD ); |
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, |
const FT_Vector* origin ) |
{ |
FT_Error error; |
|
error = ft_smooth_render_generic( render, slot, mode, origin, |
FT_RENDER_MODE_LCD_V ); |
if ( !error ) |
slot->bitmap.pixel_mode = FT_PIXEL_MODE_LCD_V; |
|
return error; |
} |
|
|
FT_DEFINE_RENDERER( 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_GET |
) |
|
|
FT_DEFINE_RENDERER( 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_GET |
) |
|
FT_DEFINE_RENDERER( 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_GET |
) |
|
|
/* END */ |