diff options
Diffstat (limited to 'src/sfnt/ttsbit0.c')
| -rw-r--r-- | src/sfnt/ttsbit0.c | 56 |
1 files changed, 49 insertions, 7 deletions
diff --git a/src/sfnt/ttsbit0.c b/src/sfnt/ttsbit0.c index 3ebcbbd..38bcf21 100644 --- a/src/sfnt/ttsbit0.c +++ b/src/sfnt/ttsbit0.c @@ -62,7 +62,7 @@ if ( table_size < 8 ) { - FT_ERROR(( "tt_face_load_sbit_strikes: table too short!\n" )); + FT_ERROR(( "tt_face_load_sbit_strikes: table too short\n" )); error = SFNT_Err_Invalid_File_Format; goto Exit; } @@ -80,7 +80,7 @@ if ( version != 0x00020000UL || num_strikes >= 0x10000UL ) { - FT_ERROR(( "tt_face_load_sbit_strikes: invalid table version!\n" )); + FT_ERROR(( "tt_face_load_sbit_strikes: invalid table version\n" )); error = SFNT_Err_Invalid_File_Format; goto Fail; } @@ -469,6 +469,41 @@ } + /* + * Load a bit-aligned bitmap (with pointer `p') into a line-aligned bitmap + * (with pointer `write'). In the example below, the width is 3 pixel, + * and `x_pos' is 1 pixel. + * + * p p+1 + * | | | + * | 7 6 5 4 3 2 1 0 | 7 6 5 4 3 2 1 0 |... + * | | | + * +-------+ +-------+ +-------+ ... + * . . . + * . . . + * v . . + * +-------+ . . + * | | . + * | 7 6 5 4 3 2 1 0 | . + * | | . + * write . . + * . . + * v . + * +-------+ . + * | | + * | 7 6 5 4 3 2 1 0 | + * | | + * write+1 . + * . + * v + * +-------+ + * | | + * | 7 6 5 4 3 2 1 0 | + * | | + * write+2 + * + */ + static FT_Error tt_sbit_decoder_load_bit_aligned( TT_SBitDecoder decoder, FT_Byte* p, @@ -514,6 +549,8 @@ } /* now do the blit */ + + /* adjust `line' to point to the first byte of the bitmap */ line += y_pos * pitch + ( x_pos >> 3 ); x_pos &= 7; @@ -524,21 +561,23 @@ for ( h = height; h > 0; h--, line += pitch ) { FT_Byte* write = line; - FT_Int w = width; + FT_Int w = width; + /* handle initial byte (in target bitmap) specially if necessary */ if ( x_pos ) { w = ( width < 8 - x_pos ) ? width : 8 - x_pos; if ( h == height ) { - rval |= *p++; - nbits += x_pos; + rval = *p++; + nbits = x_pos; } else if ( nbits < w ) { - rval |= *p++; + if ( p < limit ) + rval |= *p++; nbits += 8 - w; } else @@ -554,6 +593,7 @@ w = width - w; } + /* handle medial bytes */ for ( ; w >= 8; w -= 8 ) { rval |= *p++; @@ -562,11 +602,13 @@ rval <<= 8; } + /* handle final byte if necessary */ if ( w > 0 ) { if ( nbits < w ) { - rval |= *p++; + if ( p < limit ) + rval |= *p++; *write |= ( ( rval >> nbits ) & 0xFF ) & ( 0xFF00U >> w ); nbits += 8 - w; |