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path: root/src/freetype2/sfnt/ttsbit0.c
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Diffstat (limited to 'src/freetype2/sfnt/ttsbit0.c')
-rw-r--r--src/freetype2/sfnt/ttsbit0.c179
1 files changed, 97 insertions, 82 deletions
diff --git a/src/freetype2/sfnt/ttsbit0.c b/src/freetype2/sfnt/ttsbit0.c
index f8adc64..38bcf21 100644
--- a/src/freetype2/sfnt/ttsbit0.c
+++ b/src/freetype2/sfnt/ttsbit0.c
@@ -5,7 +5,7 @@
/* TrueType and OpenType embedded bitmap support (body). */
/* This is a heap-optimized version. */
/* */
-/* Copyright 2005, 2006, 2007 by */
+/* Copyright 2005, 2006, 2007, 2008, 2009 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@@ -39,65 +39,16 @@
#define FT_COMPONENT trace_ttsbit
- static const FT_Frame_Field tt_sbit_line_metrics_fields[] =
- {
-#undef FT_STRUCTURE
-#define FT_STRUCTURE TT_SBit_LineMetricsRec
-
- /* no FT_FRAME_START */
- FT_FRAME_CHAR( ascender ),
- FT_FRAME_CHAR( descender ),
- FT_FRAME_BYTE( max_width ),
-
- FT_FRAME_CHAR( caret_slope_numerator ),
- FT_FRAME_CHAR( caret_slope_denominator ),
- FT_FRAME_CHAR( caret_offset ),
-
- FT_FRAME_CHAR( min_origin_SB ),
- FT_FRAME_CHAR( min_advance_SB ),
- FT_FRAME_CHAR( max_before_BL ),
- FT_FRAME_CHAR( min_after_BL ),
- FT_FRAME_CHAR( pads[0] ),
- FT_FRAME_CHAR( pads[1] ),
- FT_FRAME_END
- };
-
- static const FT_Frame_Field tt_strike_start_fields[] =
- {
-#undef FT_STRUCTURE
-#define FT_STRUCTURE TT_SBit_StrikeRec
-
- /* no FT_FRAME_START */
- FT_FRAME_ULONG( ranges_offset ),
- FT_FRAME_SKIP_LONG,
- FT_FRAME_ULONG( num_ranges ),
- FT_FRAME_ULONG( color_ref ),
- FT_FRAME_END
- };
-
- static const FT_Frame_Field tt_strike_end_fields[] =
- {
- /* no FT_FRAME_START */
- FT_FRAME_USHORT( start_glyph ),
- FT_FRAME_USHORT( end_glyph ),
- FT_FRAME_BYTE ( x_ppem ),
- FT_FRAME_BYTE ( y_ppem ),
- FT_FRAME_BYTE ( bit_depth ),
- FT_FRAME_CHAR ( flags ),
- FT_FRAME_END
- };
-
-
FT_LOCAL_DEF( FT_Error )
tt_face_load_eblc( TT_Face face,
FT_Stream stream )
{
- FT_Error error = SFNT_Err_Ok;
- FT_Fixed version;
- FT_ULong num_strikes, table_size;
- FT_Byte* p;
- FT_Byte* p_limit;
- FT_UInt count;
+ FT_Error error = SFNT_Err_Ok;
+ FT_Fixed version;
+ FT_ULong num_strikes, table_size;
+ FT_Byte* p;
+ FT_Byte* p_limit;
+ FT_UInt count;
face->sbit_num_strikes = 0;
@@ -111,7 +62,7 @@
if ( table_size < 8 )
{
- FT_ERROR(( "%s: table too short!\n", "tt_face_load_sbit_strikes" ));
+ FT_ERROR(( "tt_face_load_sbit_strikes: table too short\n" ));
error = SFNT_Err_Invalid_File_Format;
goto Exit;
}
@@ -129,8 +80,7 @@
if ( version != 0x00020000UL || num_strikes >= 0x10000UL )
{
- FT_ERROR(( "%s: invalid table version!\n",
- "tt_face_load_sbit_strikes" ));
+ FT_ERROR(( "tt_face_load_sbit_strikes: invalid table version\n" ));
error = SFNT_Err_Invalid_File_Format;
goto Fail;
}
@@ -182,7 +132,7 @@
FT_ULong strike_index,
FT_Size_Metrics* metrics )
{
- FT_Byte* strike;
+ FT_Byte* strike;
if ( strike_index >= (FT_ULong)face->sbit_num_strikes )
@@ -207,7 +157,7 @@
}
- typedef struct
+ typedef struct TT_SBitDecoderRec_
{
TT_Face face;
FT_Stream stream;
@@ -374,14 +324,11 @@
if ( p + 5 > limit )
goto Fail;
- if ( !decoder->metrics_loaded )
- {
- metrics->height = p[0];
- metrics->width = p[1];
- metrics->horiBearingX = (FT_Char)p[2];
- metrics->horiBearingY = (FT_Char)p[3];
- metrics->horiAdvance = p[4];
- }
+ metrics->height = p[0];
+ metrics->width = p[1];
+ metrics->horiBearingX = (FT_Char)p[2];
+ metrics->horiBearingY = (FT_Char)p[3];
+ metrics->horiAdvance = p[4];
p += 5;
if ( big )
@@ -389,19 +336,16 @@
if ( p + 3 > limit )
goto Fail;
- if ( !decoder->metrics_loaded )
- {
- metrics->vertBearingX = (FT_Char)p[0];
- metrics->vertBearingY = (FT_Char)p[1];
- metrics->vertAdvance = p[2];
- }
+ metrics->vertBearingX = (FT_Char)p[0];
+ metrics->vertBearingY = (FT_Char)p[1];
+ metrics->vertAdvance = p[2];
p += 3;
}
decoder->metrics_loaded = 1;
*pp = p;
- return 0;
+ return SFNT_Err_Ok;
Fail:
return SFNT_Err_Invalid_Argument;
@@ -507,7 +451,7 @@
if ( w > 0 )
wval = (FT_UInt)( wval | ( *p++ & ( 0xFF00U >> w ) ) );
- /* all bits read and there are ( x_pos + w ) bits to be written */
+ /* all bits read and there are `x_pos + w' bits to be written */
write[0] = (FT_Byte)( write[0] | ( wval >> x_pos ) );
@@ -525,6 +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,
@@ -570,6 +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;
@@ -580,16 +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 ( nbits < w )
+ if ( h == height )
{
- rval |= *p++;
+ rval = *p++;
+ nbits = x_pos;
+ }
+ else if ( nbits < w )
+ {
+ if ( p < limit )
+ rval |= *p++;
nbits += 8 - w;
}
else
@@ -598,12 +586,14 @@
nbits -= w;
}
- *write++ |= ( ( rval >> nbits ) & 0xFF ) & ~( 0xFF << w );
+ *write++ |= ( ( rval >> nbits ) & 0xFF ) &
+ ( ~( 0xFF << w ) << ( 8 - w - x_pos ) );
rval <<= 8;
w = width - w;
}
+ /* handle medial bytes */
for ( ; w >= 8; w -= 8 )
{
rval |= *p++;
@@ -612,11 +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;
@@ -645,6 +637,13 @@
FT_Error error = SFNT_Err_Ok;
FT_UInt num_components, nn;
+ FT_Char horiBearingX = decoder->metrics->horiBearingX;
+ FT_Char horiBearingY = decoder->metrics->horiBearingY;
+ FT_Byte horiAdvance = decoder->metrics->horiAdvance;
+ FT_Char vertBearingX = decoder->metrics->vertBearingX;
+ FT_Char vertBearingY = decoder->metrics->vertBearingY;
+ FT_Byte vertAdvance = decoder->metrics->vertAdvance;
+
if ( p + 2 > limit )
goto Fail;
@@ -653,6 +652,13 @@
if ( p + 4 * num_components > limit )
goto Fail;
+ if ( !decoder->bitmap_allocated )
+ {
+ error = tt_sbit_decoder_alloc_bitmap( decoder );
+ if ( error )
+ goto Exit;
+ }
+
for ( nn = 0; nn < num_components; nn++ )
{
FT_UInt gindex = FT_NEXT_USHORT( p );
@@ -667,6 +673,15 @@
break;
}
+ decoder->metrics->horiBearingX = horiBearingX;
+ decoder->metrics->horiBearingY = horiBearingY;
+ decoder->metrics->horiAdvance = horiAdvance;
+ decoder->metrics->vertBearingX = vertBearingX;
+ decoder->metrics->vertBearingY = vertBearingY;
+ decoder->metrics->vertAdvance = vertAdvance;
+ decoder->metrics->width = (FT_UInt)decoder->bitmap->width;
+ decoder->metrics->height = (FT_UInt)decoder->bitmap->rows;
+
Exit:
return error;
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-01 19:51:35 +0000