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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; 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 */