ref: dc736a6ac0d6abe15da0139a00e205e84f82deec
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;
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:
{
FT_Int pad;
FT_Long old_size;
old_size = target->rows * target->pitch;
if ( old_size < 0 )
old_size = -old_size;
target->pixel_mode = FT_PIXEL_MODE_GRAY;
target->rows = source->rows;
target->width = source->width;
pad = 0;
if ( alignment > 0 )
{
pad = source->width % alignment;
if ( pad != 0 )
pad = alignment - pad;
}
target->pitch = source->width + pad;
if ( target->rows * target->pitch > old_size &&
FT_QREALLOC( target->buffer,
old_size, target->rows * target->pitch ) )
return error;
}
break;
default:
error = FT_Err_Invalid_Argument;
}
switch ( source->pixel_mode )
{
case FT_PIXEL_MODE_MONO:
{
FT_Byte* s = source->buffer;
FT_Byte* t = target->buffer;
FT_Int i;
target->num_grays = 2;
for ( i = source->rows; i > 0; i-- )
{
FT_Byte* ss = s;
FT_Byte* tt = t;
FT_Int j;
/* get the full bytes */
for ( j = source->width >> 3; j > 0; j-- )
{
FT_Int val = ss[0]; /* avoid a byte->int cast on each line */
tt[0] = (FT_Byte)( ( val & 0x80 ) >> 7 );
tt[1] = (FT_Byte)( ( val & 0x40 ) >> 6 );
tt[2] = (FT_Byte)( ( val & 0x20 ) >> 5 );
tt[3] = (FT_Byte)( ( val & 0x10 ) >> 4 );
tt[4] = (FT_Byte)( ( val & 0x08 ) >> 3 );
tt[5] = (FT_Byte)( ( val & 0x04 ) >> 2 );
tt[6] = (FT_Byte)( ( val & 0x02 ) >> 1 );
tt[7] = (FT_Byte)( val & 0x01 );
tt += 8;
ss += 1;
}
/* get remaining pixels (if any) */
j = source->width & 7;
if ( j > 0 )
{
FT_Int val = *ss;
for ( ; j > 0; j-- )
{
tt[0] = (FT_Byte)( ( val & 0x80 ) >> 7);
val <<= 1;
tt += 1;
}
}
s += source->pitch;
t += target->pitch;
}
}
break;
case FT_PIXEL_MODE_GRAY:
{
FT_Int width = source->width;
FT_Byte* s = source->buffer;
FT_Byte* t = target->buffer;
FT_Int s_pitch = source->pitch;
FT_Int t_pitch = target->pitch;
FT_Int i;
target->num_grays = 256;
for ( i = source->rows; i > 0; i-- )
{
FT_ARRAY_COPY( t, s, width );
s += s_pitch;
t += t_pitch;
}
}
break;
case FT_PIXEL_MODE_GRAY2:
{
FT_Byte* s = source->buffer;
FT_Byte* t = target->buffer;
FT_Int i;
target->num_grays = 4;
for ( i = source->rows; i > 0; i-- )
{
FT_Byte* ss = s;
FT_Byte* tt = t;
FT_Int j;
/* get the full bytes */
for ( j = source->width >> 2; j > 0; j-- )
{
FT_Int val = ss[0];
tt[0] = (FT_Byte)( ( val & 0xC0 ) >> 6 );
tt[1] = (FT_Byte)( ( val & 0x30 ) >> 4 );
tt[2] = (FT_Byte)( ( val & 0x0C ) >> 2 );
tt[3] = (FT_Byte)( ( val & 0x03 ) );
ss += 1;
tt += 4;
}
j = source->width & 3;
if ( j > 0 )
{
FT_Int val = ss[0];
for ( ; j > 0; j-- )
{
tt[0] = (FT_Byte)( ( val & 0xC0 ) >> 6 );
val <<= 2;
tt += 1;
}
}
s += source->pitch;
t += target->pitch;
}
}
break;
case FT_PIXEL_MODE_GRAY4:
{
FT_Byte* s = source->buffer;
FT_Byte* t = target->buffer;
FT_Int i;
target->num_grays = 16;
for ( i = source->rows; i > 0; i-- )
{
FT_Byte* ss = s;
FT_Byte* tt = t;
FT_Int j;
/* get the full bytes */
for ( j = source->width >> 1; j > 0; j-- )
{
FT_Int val = ss[0];
tt[0] = (FT_Byte)( ( val & 0xF0 ) >> 4 );
tt[1] = (FT_Byte)( ( val & 0x0F ) );
ss += 1;
tt += 2;
}
if ( source->width & 1 )
tt[0] = (FT_Byte)( ( ss[0] & 0xF0 ) >> 4 );
s += source->pitch;
t += target->pitch;
}
}
break;
default:
;
}
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 */