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kc3-lang/freetype/src/base/ftbitmap.c
Werner Lemberg
- 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 */