ref: c9114b99269c9121e93f8c8d3684120f4c77c34c
dir: /src/base/ftbitmap.c/
/***************************************************************************/
/* */
/* ftbitmap.c */
/* */
/* FreeType utility functions for converting 1bpp, 2bpp, 4bpp, and 8bpp */
/* bitmaps into 8bpp format (body). */
/* */
/* Copyright 2004 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_FREETYPE_H
#include FT_IMAGE_H
#include FT_INTERNAL_OBJECTS_H
static
const FT_Bitmap null_bitmap = { 0, 0, 0, 0, 0, 0, 0, 0 };
/* documentation is in ftbitmap.h */
FT_EXPORT_DEF( void )
FT_Bitmap_New( FT_Bitmap *abitmap )
{
*abitmap = null_bitmap;
}
/* documentation is in ftbitmap.h */
FT_EXPORT_DEF( FT_Error )
FT_Bitmap_Convert( FT_Library library,
const FT_Bitmap *source,
FT_Bitmap *target,
FT_Int alignment )
{
FT_Error error = FT_Err_Ok;
FT_Memory memory;
FT_Int i, j, old_size;
FT_Byte *s, *ss, *t, *tt;
if ( !library )
return FT_Err_Invalid_Library_Handle;
memory = library->memory;
switch ( source->pixel_mode )
{
case FT_PIXEL_MODE_MONO:
case FT_PIXEL_MODE_GRAY:
case FT_PIXEL_MODE_GRAY2:
case FT_PIXEL_MODE_GRAY4:
old_size = target->rows * target->pitch;
target->pixel_mode = FT_PIXEL_MODE_GRAY;
target->rows = source->rows;
target->width = source->width;
target->pitch = ( source->width + alignment - 1 )
/ alignment * alignment;
if ( target->rows * target->pitch > old_size )
if ( FT_QREALLOC( target->buffer,
old_size, target->rows * target->pitch ) )
return error;
break;
default:
error = FT_Err_Invalid_Argument;
}
s = source->buffer;
t = target->buffer;
switch ( source->pixel_mode )
{
case FT_PIXEL_MODE_MONO:
target->num_grays = 2;
for ( i = 0; i < source->rows; i++ )
{
ss = s;
tt = t;
/* get the full bytes */
for ( j = 0; j < ( source->width >> 3 ); j++ )
{
*(tt++) = (FT_Byte)( ( *ss & 0x80 ) >> 7 );
*(tt++) = (FT_Byte)( ( *ss & 0x40 ) >> 6 );
*(tt++) = (FT_Byte)( ( *ss & 0x20 ) >> 5 );
*(tt++) = (FT_Byte)( ( *ss & 0x10 ) >> 4 );
*(tt++) = (FT_Byte)( ( *ss & 0x08 ) >> 3 );
*(tt++) = (FT_Byte)( ( *ss & 0x04 ) >> 2 );
*(tt++) = (FT_Byte)( ( *ss & 0x02 ) >> 1 );
*(tt++) = (FT_Byte)( *ss & 0x01 );
ss++;
}
/* get remaining pixels (if any) */
switch ( source->width & 7 )
{
case 7:
*(tt++) = (FT_Byte)( ( *ss & 0x80 ) >> 7 );
/* fall through */
case 6:
*(tt++) = (FT_Byte)( ( *ss & 0x40 ) >> 6 );
/* fall through */
case 5:
*(tt++) = (FT_Byte)( ( *ss & 0x20 ) >> 5 );
/* fall through */
case 4:
*(tt++) = (FT_Byte)( ( *ss & 0x10 ) >> 4 );
/* fall through */
case 3:
*(tt++) = (FT_Byte)( ( *ss & 0x08 ) >> 3 );
/* fall through */
case 2:
*(tt++) = (FT_Byte)( ( *ss & 0x04 ) >> 2 );
/* fall through */
case 1:
*(tt++) = (FT_Byte)( ( *ss & 0x02 ) >> 1 );
/* fall through */
case 0:
break;
}
s += source->pitch;
t += target->pitch;
}
break;
case FT_PIXEL_MODE_GRAY:
target->num_grays = 256;
for ( i = 0; i < source->rows; i++ )
{
ss = s;
tt = t;
for ( j = 0; j < source->width; j++ )
*(tt++) = *(ss++);
s += source->pitch;
t += target->pitch;
}
break;
case FT_PIXEL_MODE_GRAY2:
target->num_grays = 4;
for ( i = 0; i < source->rows; i++ )
{
ss = s;
tt = t;
/* get the full bytes */
for ( j = 0; j < ( source->width >> 2 ); j++ )
{
*(tt++) = (FT_Byte)( ( *ss & 0xC0 ) >> 6 );
*(tt++) = (FT_Byte)( ( *ss & 0x30 ) >> 4 );
*(tt++) = (FT_Byte)( ( *ss & 0x0C ) >> 2 );
*(tt++) = (FT_Byte)( *ss & 0x03 );
ss++;
}
/* get remaining pixels (if any) */
switch ( source->width & 3 )
{
case 3:
*(tt++) = (FT_Byte)( ( *ss & 0xC0 ) >> 6 );
/* fall through */
case 2:
*(tt++) = (FT_Byte)( ( *ss & 0x30 ) >> 4 );
/* fall through */
case 1:
*(tt++) = (FT_Byte)( ( *ss & 0x0C ) >> 2 );
/* fall through */
case 0:
break;
}
s += source->pitch;
t += target->pitch;
}
break;
case FT_PIXEL_MODE_GRAY4:
target->num_grays = 16;
for ( i = 0; i < source->rows; i++ )
{
ss = s;
tt = t;
/* get the full bytes */
for ( j = 0; j < ( source->width >> 1 ); j++ )
{
*(tt++) = (FT_Byte)( ( *ss & 0xF0 ) >> 4 );
*(tt++) = (FT_Byte)( *ss & 0x0F );
ss++;
}
/* get remaining pixels (if any) */
switch ( source->width & 1 )
{
case 1:
*(tt++) = (FT_Byte)( ( *ss & 0xF0 ) >> 4 );
/* fall through */
case 0:
break;
}
s += source->pitch;
t += target->pitch;
}
break;
}
return error;
}
/* documentation is in ftbitmap.h */
FT_EXPORT_DEF( FT_Error )
FT_Bitmap_Done( FT_Library library,
FT_Bitmap *bitmap )
{
FT_Memory memory;
if ( !library )
return FT_Err_Invalid_Library_Handle;
if ( !bitmap )
return FT_Err_Invalid_Argument;
memory = library->memory;
FT_FREE( bitmap->buffer );
*bitmap = null_bitmap;
return FT_Err_Ok;
}
/* END */