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mingw-freetype/0001-pcf-Fix-handling-of-undefined-glyph-56067.patch

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Update to 2.10.0
2019-08-29 22:43:02 +00:00
diff -rupN --no-dereference freetype-2.10.0/src/pcf/pcfdrivr.c freetype-2.10.0-new/src/pcf/pcfdrivr.c
--- freetype-2.10.0/src/pcf/pcfdrivr.c 2019-02-23 09:39:04.000000000 +0100
+++ freetype-2.10.0-new/src/pcf/pcfdrivr.c 2019-08-30 00:39:51.634521511 +0200
@@ -122,9 +122,9 @@ THE SOFTWARE.
charcodeCol > enc->lastCol )
return 0;
- return (FT_UInt)enc->offset[ ( charcodeRow - enc->firstRow ) *
- ( enc->lastCol - enc->firstCol + 1 ) +
- charcodeCol - enc->firstCol ];
+ return (FT_UInt)enc->offset[( charcodeRow - enc->firstRow ) *
+ ( enc->lastCol - enc->firstCol + 1 ) +
+ charcodeCol - enc->firstCol];
}
@@ -160,9 +160,9 @@ THE SOFTWARE.
charcode = (FT_UInt32)( charcodeRow * 256 + charcodeCol );
- result = (FT_UInt)enc->offset[ ( charcodeRow - enc->firstRow ) *
- ( enc->lastCol - enc->firstCol + 1 ) +
- charcodeCol - enc->firstCol ];
+ result = (FT_UInt)enc->offset[( charcodeRow - enc->firstRow ) *
+ ( enc->lastCol - enc->firstCol + 1 ) +
+ charcodeCol - enc->firstCol];
if ( result != 0xFFFFU )
break;
}
diff -rupN --no-dereference freetype-2.10.0/src/pcf/pcf.h freetype-2.10.0-new/src/pcf/pcf.h
--- freetype-2.10.0/src/pcf/pcf.h 2019-02-23 09:39:04.000000000 +0100
+++ freetype-2.10.0-new/src/pcf/pcf.h 2019-08-30 00:39:51.634521511 +0200
@@ -99,7 +99,8 @@ FT_BEGIN_HEADER
FT_Short ascent;
FT_Short descent;
FT_Short attributes;
- FT_ULong bits;
+
+ FT_ULong bits; /* offset into the PCF_BITMAPS table */
} PCF_MetricRec, *PCF_Metric;
diff -rupN --no-dereference freetype-2.10.0/src/pcf/pcfread.c freetype-2.10.0-new/src/pcf/pcfread.c
--- freetype-2.10.0/src/pcf/pcfread.c 2019-02-23 09:39:04.000000000 +0100
+++ freetype-2.10.0-new/src/pcf/pcfread.c 2019-08-30 00:39:51.635521511 +0200
@@ -743,33 +743,39 @@ THE SOFTWARE.
if ( !orig_nmetrics )
return FT_THROW( Invalid_Table );
- /* PCF is a format from ancient times; Unicode was in its */
- /* infancy, and widely used two-byte character sets for CJK */
- /* scripts (Big 5, GB 2312, JIS X 0208, etc.) did have at most */
- /* 15000 characters. Even the more exotic CNS 11643 and CCCII */
- /* standards, which were essentially three-byte character sets, */
- /* provided less then 65536 assigned characters. */
- /* */
- /* While technically possible to have a larger number of glyphs */
- /* in PCF files, we thus limit the number to 65536. */
- if ( orig_nmetrics > 65536 )
+ /*
+ * PCF is a format from ancient times; Unicode was in its infancy, and
+ * widely used two-byte character sets for CJK scripts (Big 5, GB 2312,
+ * JIS X 0208, etc.) did have at most 15000 characters. Even the more
+ * exotic CNS 11643 and CCCII standards, which were essentially
+ * three-byte character sets, provided less then 65536 assigned
+ * characters.
+ *
+ * While technically possible to have a larger number of glyphs in PCF
+ * files, we thus limit the number to 65535, taking into account that we
+ * synthesize the metrics of glyph 0 to be a copy of the `default
+ * character', and that 0xFFFF in the encodings array indicates a
+ * missing glyph.
+ */
+ if ( orig_nmetrics > 65534 )
{
FT_TRACE0(( "pcf_get_metrics:"
- " only loading first 65536 metrics\n" ));
- nmetrics = 65536;
+ " only loading first 65534 metrics\n" ));
+ nmetrics = 65534;
}
else
nmetrics = orig_nmetrics;
- face->nmetrics = nmetrics;
+ face->nmetrics = nmetrics + 1;
- if ( FT_NEW_ARRAY( face->metrics, nmetrics ) )
+ if ( FT_NEW_ARRAY( face->metrics, face->nmetrics ) )
return error;
- metrics = face->metrics;
+ /* we handle glyph index 0 later on */
+ metrics = face->metrics + 1;
FT_TRACE4(( "\n" ));
- for ( i = 0; i < nmetrics; i++, metrics++ )
+ for ( i = 1; i < face->nmetrics; i++, metrics++ )
{
FT_TRACE5(( " idx %ld:", i ));
error = pcf_get_metric( stream, format, metrics );
@@ -808,12 +814,10 @@ THE SOFTWARE.
pcf_get_bitmaps( FT_Stream stream,
PCF_Face face )
{
- FT_Error error;
- FT_Memory memory = FT_FACE( face )->memory;
- FT_ULong* offsets = NULL;
- FT_ULong bitmapSizes[GLYPHPADOPTIONS];
- FT_ULong format, size;
- FT_ULong nbitmaps, orig_nbitmaps, i, sizebitmaps = 0;
+ FT_Error error;
+ FT_ULong bitmapSizes[GLYPHPADOPTIONS];
+ FT_ULong format, size, pos;
+ FT_ULong nbitmaps, orig_nbitmaps, i, sizebitmaps = 0;
error = pcf_seek_to_table_type( stream,
@@ -859,31 +863,46 @@ THE SOFTWARE.
FT_TRACE4(( " number of bitmaps: %ld\n", orig_nbitmaps ));
/* see comment in `pcf_get_metrics' */
- if ( orig_nbitmaps > 65536 )
+ if ( orig_nbitmaps > 65534 )
{
FT_TRACE0(( "pcf_get_bitmaps:"
- " only loading first 65536 bitmaps\n" ));
- nbitmaps = 65536;
+ " only loading first 65534 bitmaps\n" ));
+ nbitmaps = 65534;
}
else
nbitmaps = orig_nbitmaps;
- if ( nbitmaps != face->nmetrics )
+ /* no extra bitmap for glyph 0 */
+ if ( nbitmaps != face->nmetrics - 1 )
return FT_THROW( Invalid_File_Format );
- if ( FT_NEW_ARRAY( offsets, nbitmaps ) )
- return error;
+ /* start position of bitmap data */
+ pos = stream->pos + nbitmaps * 4 + 4 * 4;
FT_TRACE5(( "\n" ));
- for ( i = 0; i < nbitmaps; i++ )
+ for ( i = 1; i <= nbitmaps; i++ )
{
+ FT_ULong offset;
+
+
if ( PCF_BYTE_ORDER( format ) == MSBFirst )
- (void)FT_READ_ULONG( offsets[i] );
+ (void)FT_READ_ULONG( offset );
else
- (void)FT_READ_ULONG_LE( offsets[i] );
+ (void)FT_READ_ULONG_LE( offset );
FT_TRACE5(( " bitmap %lu: offset %lu (0x%lX)\n",
- i, offsets[i], offsets[i] ));
+ i, offset, offset ));
+
+ /* right now, we only check the offset with a rough estimate; */
+ /* actual bitmaps are only loaded on demand */
+ if ( offset > size )
+ {
+ FT_TRACE0(( "pcf_get_bitmaps:"
+ " invalid offset to bitmap data of glyph %lu\n", i ));
+ face->metrics[i].bits = pos;
+ }
+ else
+ face->metrics[i].bits = pos + offset;
}
if ( error )
goto Bail;
@@ -910,24 +929,9 @@ THE SOFTWARE.
FT_UNUSED( sizebitmaps ); /* only used for debugging */
- /* right now, we only check the bitmap offsets; */
- /* actual bitmaps are only loaded on demand */
- for ( i = 0; i < nbitmaps; i++ )
- {
- /* rough estimate */
- if ( offsets[i] > size )
- {
- FT_TRACE0(( "pcf_get_bitmaps:"
- " invalid offset to bitmap data of glyph %lu\n", i ));
- }
- else
- face->metrics[i].bits = stream->pos + offsets[i];
- }
-
face->bitmapsFormat = format;
Bail:
- FT_FREE( offsets );
return error;
}
@@ -1062,41 +1066,52 @@ THE SOFTWARE.
defaultCharCol = enc->firstCol;
}
- /* FreeType mandates that glyph index 0 is the `undefined glyph', */
- /* which PCF calls the `default character'. For this reason, we */
- /* swap the positions of glyph index 0 and the index corresponding */
- /* to `defaultChar' in case they are different. */
-
- /* `stream->cursor' still points at the beginning of the frame; */
- /* we can thus easily get the offset to the default character */
+ /*
+ * FreeType mandates that glyph index 0 is the `undefined glyph', which
+ * PCF calls the `default character'. However, FreeType needs glyph
+ * index 0 to be used for the undefined glyph only, which is is not the
+ * case for PCF. For this reason, we add one slot for glyph index 0 and
+ * simply copy the default character to it.
+ *
+ * `stream->cursor' still points to the beginning of the frame; we can
+ * thus easily get the offset to the default character.
+ */
pos = stream->cursor +
2 * ( ( defaultCharRow - enc->firstRow ) *
- ( enc->lastCol - enc->firstCol + 1 ) +
- defaultCharCol - enc->firstCol );
+ ( enc->lastCol - enc->firstCol + 1 ) +
+ defaultCharCol - enc->firstCol );
if ( PCF_BYTE_ORDER( format ) == MSBFirst )
defaultCharEncodingOffset = FT_PEEK_USHORT( pos );
else
defaultCharEncodingOffset = FT_PEEK_USHORT_LE( pos );
- if ( defaultCharEncodingOffset >= face->nmetrics )
+ if ( defaultCharEncodingOffset == 0xFFFF )
{
FT_TRACE0(( "pcf_get_encodings:"
- " Invalid glyph index for default character,"
- " setting to zero\n" ));
- defaultCharEncodingOffset = 0;
+ " No glyph for default character,\n"
+ " "
+ " setting it to the first glyph of the font\n" ));
+ defaultCharEncodingOffset = 1;
}
-
- if ( defaultCharEncodingOffset )
+ else
{
- /* do the swapping */
- PCF_MetricRec tmp = face->metrics[defaultCharEncodingOffset];
-
+ defaultCharEncodingOffset++;
- face->metrics[defaultCharEncodingOffset] = face->metrics[0];
- face->metrics[0] = tmp;
+ if ( defaultCharEncodingOffset >= face->nmetrics )
+ {
+ FT_TRACE0(( "pcf_get_encodings:"
+ " Invalid glyph index for default character,\n"
+ " "
+ " setting it to the first glyph of the font\n" ));
+ defaultCharEncodingOffset = 1;
+ }
}
+ /* copy metrics of default character to index 0 */
+ face->metrics[0] = face->metrics[defaultCharEncodingOffset];
+
+ /* now loop over all values */
offset = enc->offset;
for ( i = enc->firstRow; i <= enc->lastRow; i++ )
{
@@ -1111,15 +1126,9 @@ THE SOFTWARE.
else
encodingOffset = FT_GET_USHORT_LE();
- if ( encodingOffset != 0xFFFFU )
- {
- if ( encodingOffset == defaultCharEncodingOffset )
- encodingOffset = 0;
- else if ( encodingOffset == 0 )
- encodingOffset = defaultCharEncodingOffset;
- }
-
- *offset++ = encodingOffset;
+ /* everything is off by 1 due to the artificial glyph 0 */
+ *offset++ = encodingOffset == 0xFFFF ? 0xFFFF
+ : encodingOffset + 1;
}
}
FT_Stream_ExitFrame( stream );
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