263 lines
6.8 KiB
C
263 lines
6.8 KiB
C
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/***************************************************************************/
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/* */
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/* ftbitmap.c */
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/* */
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/* FreeType utility functions for converting 1bpp, 2bpp, 4bpp, and 8bpp */
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/* bitmaps into 8bpp format (body). */
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/* */
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/* Copyright 2004 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_IMAGE_H
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#include FT_INTERNAL_OBJECTS_H
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static
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const FT_Bitmap null_bitmap = { 0, 0, 0, 0, 0, 0, 0, 0 };
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/* documentation is in ftbitmap.h */
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FT_EXPORT_DEF( void )
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FT_Bitmap_New( FT_Bitmap *abitmap )
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{
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*abitmap = null_bitmap;
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}
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/* documentation is in ftbitmap.h */
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FT_EXPORT_DEF( FT_Error )
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FT_Bitmap_Convert( FT_Library library,
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const FT_Bitmap *source,
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FT_Bitmap *target,
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FT_Int alignment )
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{
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FT_Error error;
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FT_Memory memory;
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FT_Int i, j, old_size;
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FT_Byte *s, *ss, *t, *tt;
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if ( !library )
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return FT_Err_Invalid_Library_Handle;
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memory = library->memory;
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switch ( source->pixel_mode )
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{
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case FT_PIXEL_MODE_MONO:
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case FT_PIXEL_MODE_GRAY:
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case FT_PIXEL_MODE_GRAY2:
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case FT_PIXEL_MODE_GRAY4:
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old_size = target->rows * target->pitch;
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target->pixel_mode = FT_PIXEL_MODE_GRAY;
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target->rows = source->rows;
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target->width = source->width;
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target->pitch = ( source->width + alignment - 1 )
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/ alignment * alignment;
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if ( target->rows * target->pitch > old_size )
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if ( FT_QREALLOC( target->buffer,
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old_size, target->rows * target->pitch ) )
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return error;
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break;
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default:
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error = FT_Err_Invalid_Argument;
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}
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s = source->buffer;
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t = target->buffer;
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switch ( source->pixel_mode )
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{
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case FT_PIXEL_MODE_MONO:
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target->num_grays = 2;
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for ( i = 0; i < source->rows; i++ )
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{
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ss = s;
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tt = t;
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/* get the full bytes */
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for ( j = 0; j < ( source->width >> 3 ); j++ )
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{
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*(tt++) = (FT_Byte)( ( *ss & 0x80 ) >> 7 );
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*(tt++) = (FT_Byte)( ( *ss & 0x40 ) >> 6 );
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*(tt++) = (FT_Byte)( ( *ss & 0x20 ) >> 5 );
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*(tt++) = (FT_Byte)( ( *ss & 0x10 ) >> 4 );
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*(tt++) = (FT_Byte)( ( *ss & 0x08 ) >> 3 );
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*(tt++) = (FT_Byte)( ( *ss & 0x04 ) >> 2 );
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*(tt++) = (FT_Byte)( ( *ss & 0x02 ) >> 1 );
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*(tt++) = (FT_Byte)( *ss & 0x01 );
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ss++;
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}
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/* get remaining pixels (if any) */
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switch ( source->width & 7 )
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{
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case 7:
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*(tt++) = (FT_Byte)( ( *ss & 0x80 ) >> 7 );
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/* fall through */
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case 6:
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*(tt++) = (FT_Byte)( ( *ss & 0x40 ) >> 6 );
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/* fall through */
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case 5:
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*(tt++) = (FT_Byte)( ( *ss & 0x20 ) >> 5 );
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/* fall through */
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case 4:
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*(tt++) = (FT_Byte)( ( *ss & 0x10 ) >> 4 );
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/* fall through */
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case 3:
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*(tt++) = (FT_Byte)( ( *ss & 0x08 ) >> 3 );
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/* fall through */
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case 2:
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*(tt++) = (FT_Byte)( ( *ss & 0x04 ) >> 2 );
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/* fall through */
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case 1:
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*(tt++) = (FT_Byte)( ( *ss & 0x02 ) >> 1 );
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/* fall through */
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case 0:
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break;
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}
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s += source->pitch;
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t += target->pitch;
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}
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break;
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case FT_PIXEL_MODE_GRAY:
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target->num_grays = 256;
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for ( i = 0; i < source->rows; i++ )
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{
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ss = s;
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tt = t;
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for ( j = 0; j < source->width; j++ )
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*(tt++) = *(ss++);
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s += source->pitch;
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t += target->pitch;
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}
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break;
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case FT_PIXEL_MODE_GRAY2:
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target->num_grays = 4;
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for ( i = 0; i < source->rows; i++ )
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{
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ss = s;
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tt = t;
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/* get the full bytes */
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for ( j = 0; j < ( source->width >> 2 ); j++ )
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{
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*(tt++) = (FT_Byte)( ( *ss & 0xC0 ) >> 6 );
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*(tt++) = (FT_Byte)( ( *ss & 0x30 ) >> 4 );
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*(tt++) = (FT_Byte)( ( *ss & 0x0C ) >> 2 );
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*(tt++) = (FT_Byte)( *ss & 0x03 );
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ss++;
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}
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/* get remaining pixels (if any) */
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switch ( source->width & 3 )
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{
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case 3:
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*(tt++) = (FT_Byte)( ( *ss & 0xC0 ) >> 6 );
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/* fall through */
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case 2:
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*(tt++) = (FT_Byte)( ( *ss & 0x30 ) >> 4 );
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/* fall through */
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case 1:
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*(tt++) = (FT_Byte)( ( *ss & 0x0C ) >> 2 );
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/* fall through */
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case 0:
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break;
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}
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s += source->pitch;
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t += target->pitch;
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}
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break;
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case FT_PIXEL_MODE_GRAY4:
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target->num_grays = 16;
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for ( i = 0; i < source->rows; i++ )
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{
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ss = s;
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tt = t;
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/* get the full bytes */
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for ( j = 0; j < ( source->width >> 1 ); j++ )
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{
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*(tt++) = (FT_Byte)( ( *ss & 0xF0 ) >> 4 );
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*(tt++) = (FT_Byte)( *ss & 0x0F );
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ss++;
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}
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/* get remaining pixels (if any) */
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switch ( source->width & 1 )
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{
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case 1:
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*(tt++) = (FT_Byte)( ( *ss & 0xF0 ) >> 4 );
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/* fall through */
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case 0:
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break;
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}
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s += source->pitch;
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t += target->pitch;
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}
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break;
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}
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return error;
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}
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/* documentation is in ftbitmap.h */
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FT_EXPORT_DEF( FT_Error )
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FT_Bitmap_Done( FT_Library library,
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FT_Bitmap *bitmap )
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{
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FT_Memory memory;
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if ( !library )
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return FT_Err_Invalid_Library_Handle;
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if ( !bitmap )
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return FT_Err_Invalid_Argument;
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memory = library->memory;
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FT_FREE( bitmap->buffer );
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*bitmap = null_bitmap;
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return FT_Err_Ok;
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}
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/* END */
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