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Unified Diff: third_party/freetype2/src/src/truetype/ttgxvar.c

Issue 1524973002: Update freetype sources (2.6.2) in third party. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 5 years ago
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Index: third_party/freetype2/src/src/truetype/ttgxvar.c
diff --git a/third_party/freetype2/src/src/truetype/ttgxvar.c b/third_party/freetype2/src/src/truetype/ttgxvar.c
new file mode 100644
index 0000000000000000000000000000000000000000..5d4384eabb293dcc6869b1ed2e70da6eca768487
--- /dev/null
+++ b/third_party/freetype2/src/src/truetype/ttgxvar.c
@@ -0,0 +1,2156 @@
+/***************************************************************************/
+/* */
+/* ttgxvar.c */
+/* */
+/* TrueType GX Font Variation loader */
+/* */
+/* Copyright 2004-2015 by */
+/* David Turner, Robert Wilhelm, Werner Lemberg, and George Williams. */
+/* */
+/* 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. */
+/* */
+/***************************************************************************/
+
+
+ /*************************************************************************/
+ /* */
+ /* Apple documents the `fvar', `gvar', `cvar', and `avar' tables at */
+ /* */
+ /* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6[fgca]var.html */
+ /* */
+ /* The documentation for `fvar' is inconsistent. At one point it says */
+ /* that `countSizePairs' should be 3, at another point 2. It should */
+ /* be 2. */
+ /* */
+ /* The documentation for `gvar' is not intelligible; `cvar' refers you */
+ /* to `gvar' and is thus also incomprehensible. */
+ /* */
+ /* The documentation for `avar' appears correct, but Apple has no fonts */
+ /* with an `avar' table, so it is hard to test. */
+ /* */
+ /* Many thanks to John Jenkins (at Apple) in figuring this out. */
+ /* */
+ /* */
+ /* Apple's `kern' table has some references to tuple indices, but as */
+ /* there is no indication where these indices are defined, nor how to */
+ /* interpolate the kerning values (different tuples have different */
+ /* classes) this issue is ignored. */
+ /* */
+ /*************************************************************************/
+
+
+#include <ft2build.h>
+#include FT_INTERNAL_DEBUG_H
+#include FT_CONFIG_CONFIG_H
+#include FT_INTERNAL_STREAM_H
+#include FT_INTERNAL_SFNT_H
+#include FT_TRUETYPE_TAGS_H
+#include FT_MULTIPLE_MASTERS_H
+
+#include "ttpload.h"
+#include "ttgxvar.h"
+
+#include "tterrors.h"
+
+
+#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
+
+
+#define FT_Stream_FTell( stream ) \
+ (FT_ULong)( (stream)->cursor - (stream)->base )
+#define FT_Stream_SeekSet( stream, off ) \
+ ( (stream)->cursor = (stream)->base + (off) )
+
+
+ /*************************************************************************/
+ /* */
+ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
+ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
+ /* messages during execution. */
+ /* */
+#undef FT_COMPONENT
+#define FT_COMPONENT trace_ttgxvar
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** Internal Routines *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+
+ /*************************************************************************/
+ /* */
+ /* The macro ALL_POINTS is used in `ft_var_readpackedpoints'. It */
+ /* indicates that there is a delta for every point without needing to */
+ /* enumerate all of them. */
+ /* */
+
+ /* ensure that value `0' has the same width as a pointer */
+#define ALL_POINTS (FT_UShort*)~(FT_PtrDist)0
+
+
+#define GX_PT_POINTS_ARE_WORDS 0x80U
+#define GX_PT_POINT_RUN_COUNT_MASK 0x7FU
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* ft_var_readpackedpoints */
+ /* */
+ /* <Description> */
+ /* Read a set of points to which the following deltas will apply. */
+ /* Points are packed with a run length encoding. */
+ /* */
+ /* <Input> */
+ /* stream :: The data stream. */
+ /* */
+ /* size :: The size of the table holding the data. */
+ /* */
+ /* <Output> */
+ /* point_cnt :: The number of points read. A zero value means that */
+ /* all points in the glyph will be affected, without */
+ /* enumerating them individually. */
+ /* */
+ /* <Return> */
+ /* An array of FT_UShort containing the affected points or the */
+ /* special value ALL_POINTS. */
+ /* */
+ static FT_UShort*
+ ft_var_readpackedpoints( FT_Stream stream,
+ FT_ULong size,
+ FT_UInt *point_cnt )
+ {
+ FT_UShort *points = NULL;
+ FT_UInt n;
+ FT_UInt runcnt;
+ FT_UInt i, j;
+ FT_UShort first;
+ FT_Memory memory = stream->memory;
+ FT_Error error = FT_Err_Ok;
+
+ FT_UNUSED( error );
+
+
+ *point_cnt = 0;
+
+ n = FT_GET_BYTE();
+ if ( n == 0 )
+ return ALL_POINTS;
+
+ if ( n & GX_PT_POINTS_ARE_WORDS )
+ {
+ n &= GX_PT_POINT_RUN_COUNT_MASK;
+ n <<= 8;
+ n |= FT_GET_BYTE();
+ }
+
+ if ( n > size )
+ {
+ FT_TRACE1(( "ft_var_readpackedpoints: number of points too large\n" ));
+ return NULL;
+ }
+
+ if ( FT_NEW_ARRAY( points, n ) )
+ return NULL;
+
+ *point_cnt = n;
+
+ i = 0;
+ while ( i < n )
+ {
+ runcnt = FT_GET_BYTE();
+ if ( runcnt & GX_PT_POINTS_ARE_WORDS )
+ {
+ runcnt &= GX_PT_POINT_RUN_COUNT_MASK;
+ first = FT_GET_USHORT();
+ points[i++] = first;
+
+ if ( runcnt < 1 || i + runcnt > n )
+ goto Exit;
+
+ /* first point not included in run count */
+ for ( j = 0; j < runcnt; j++ )
+ {
+ first += FT_GET_USHORT();
+ points[i++] = first;
+ }
+ }
+ else
+ {
+ first = FT_GET_BYTE();
+ points[i++] = first;
+
+ if ( runcnt < 1 || i + runcnt > n )
+ goto Exit;
+
+ for ( j = 0; j < runcnt; j++ )
+ {
+ first += FT_GET_BYTE();
+ points[i++] = first;
+ }
+ }
+ }
+
+ Exit:
+ return points;
+ }
+
+
+#define GX_DT_DELTAS_ARE_ZERO 0x80U
+#define GX_DT_DELTAS_ARE_WORDS 0x40U
+#define GX_DT_DELTA_RUN_COUNT_MASK 0x3FU
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* ft_var_readpackeddeltas */
+ /* */
+ /* <Description> */
+ /* Read a set of deltas. These are packed slightly differently than */
+ /* points. In particular there is no overall count. */
+ /* */
+ /* <Input> */
+ /* stream :: The data stream. */
+ /* */
+ /* size :: The size of the table holding the data. */
+ /* */
+ /* delta_cnt :: The number of deltas to be read. */
+ /* */
+ /* <Return> */
+ /* An array of FT_Short containing the deltas for the affected */
+ /* points. (This only gets the deltas for one dimension. It will */
+ /* generally be called twice, once for x, once for y. When used in */
+ /* cvt table, it will only be called once.) */
+ /* */
+ static FT_Short*
+ ft_var_readpackeddeltas( FT_Stream stream,
+ FT_ULong size,
+ FT_UInt delta_cnt )
+ {
+ FT_Short *deltas = NULL;
+ FT_UInt runcnt, cnt;
+ FT_UInt i, j;
+ FT_Memory memory = stream->memory;
+ FT_Error error = FT_Err_Ok;
+
+ FT_UNUSED( error );
+
+
+ if ( delta_cnt > size )
+ {
+ FT_TRACE1(( "ft_var_readpackeddeltas: number of points too large\n" ));
+ return NULL;
+ }
+
+ if ( FT_NEW_ARRAY( deltas, delta_cnt ) )
+ return NULL;
+
+ i = 0;
+ while ( i < delta_cnt )
+ {
+ runcnt = FT_GET_BYTE();
+ cnt = runcnt & GX_DT_DELTA_RUN_COUNT_MASK;
+
+ if ( runcnt & GX_DT_DELTAS_ARE_ZERO )
+ {
+ /* `runcnt' zeroes get added */
+ for ( j = 0; j <= cnt && i < delta_cnt; j++ )
+ deltas[i++] = 0;
+ }
+ else if ( runcnt & GX_DT_DELTAS_ARE_WORDS )
+ {
+ /* `runcnt' shorts from the stack */
+ for ( j = 0; j <= cnt && i < delta_cnt; j++ )
+ deltas[i++] = FT_GET_SHORT();
+ }
+ else
+ {
+ /* `runcnt' signed bytes from the stack */
+ for ( j = 0; j <= cnt && i < delta_cnt; j++ )
+ deltas[i++] = FT_GET_CHAR();
+ }
+
+ if ( j <= cnt )
+ {
+ /* bad format */
+ FT_FREE( deltas );
+ return NULL;
+ }
+ }
+
+ return deltas;
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* ft_var_load_avar */
+ /* */
+ /* <Description> */
+ /* Parse the `avar' table if present. It need not be, so we return */
+ /* nothing. */
+ /* */
+ /* <InOut> */
+ /* face :: The font face. */
+ /* */
+ static void
+ ft_var_load_avar( TT_Face face )
+ {
+ FT_Stream stream = FT_FACE_STREAM( face );
+ FT_Memory memory = stream->memory;
+ GX_Blend blend = face->blend;
+ GX_AVarSegment segment;
+ FT_Error error = FT_Err_Ok;
+ FT_Long version;
+ FT_Long axisCount;
+ FT_Int i, j;
+ FT_ULong table_len;
+
+ FT_UNUSED( error );
+
+
+ FT_TRACE2(( "AVAR " ));
+
+ blend->avar_checked = TRUE;
+ error = face->goto_table( face, TTAG_avar, stream, &table_len );
+ if ( error )
+ {
+ FT_TRACE2(( "is missing\n" ));
+ return;
+ }
+
+ if ( FT_FRAME_ENTER( table_len ) )
+ return;
+
+ version = FT_GET_LONG();
+ axisCount = FT_GET_LONG();
+
+ if ( version != 0x00010000L )
+ {
+ FT_TRACE2(( "bad table version\n" ));
+ goto Exit;
+ }
+
+ FT_TRACE2(( "loaded\n" ));
+
+ if ( axisCount != (FT_Long)blend->mmvar->num_axis )
+ {
+ FT_TRACE2(( "ft_var_load_avar: number of axes in `avar' and `cvar'\n"
+ " table are different\n" ));
+ goto Exit;
+ }
+
+ if ( FT_NEW_ARRAY( blend->avar_segment, axisCount ) )
+ goto Exit;
+
+ segment = &blend->avar_segment[0];
+ for ( i = 0; i < axisCount; i++, segment++ )
+ {
+ FT_TRACE5(( " axis %d:\n", i ));
+
+ segment->pairCount = FT_GET_USHORT();
+ if ( (FT_ULong)segment->pairCount * 4 > table_len ||
+ FT_NEW_ARRAY( segment->correspondence, segment->pairCount ) )
+ {
+ /* Failure. Free everything we have done so far. We must do */
+ /* it right now since loading the `avar' table is optional. */
+
+ for ( j = i - 1; j >= 0; j-- )
+ FT_FREE( blend->avar_segment[j].correspondence );
+
+ FT_FREE( blend->avar_segment );
+ blend->avar_segment = NULL;
+ goto Exit;
+ }
+
+ for ( j = 0; j < segment->pairCount; j++ )
+ {
+ /* convert to Fixed */
+ segment->correspondence[j].fromCoord = FT_GET_SHORT() * 4;
+ segment->correspondence[j].toCoord = FT_GET_SHORT() * 4;
+
+ FT_TRACE5(( " mapping %.4f to %.4f\n",
+ segment->correspondence[j].fromCoord / 65536.0,
+ segment->correspondence[j].toCoord / 65536.0 ));
+ }
+
+ FT_TRACE5(( "\n" ));
+ }
+
+ Exit:
+ FT_FRAME_EXIT();
+ }
+
+
+ typedef struct GX_GVar_Head_
+ {
+ FT_Long version;
+ FT_UShort axisCount;
+ FT_UShort globalCoordCount;
+ FT_ULong offsetToCoord;
+ FT_UShort glyphCount;
+ FT_UShort flags;
+ FT_ULong offsetToData;
+
+ } GX_GVar_Head;
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* ft_var_load_gvar */
+ /* */
+ /* <Description> */
+ /* Parse the `gvar' table if present. If `fvar' is there, `gvar' had */
+ /* better be there too. */
+ /* */
+ /* <InOut> */
+ /* face :: The font face. */
+ /* */
+ /* <Return> */
+ /* FreeType error code. 0 means success. */
+ /* */
+ static FT_Error
+ ft_var_load_gvar( TT_Face face )
+ {
+ FT_Stream stream = FT_FACE_STREAM( face );
+ FT_Memory memory = stream->memory;
+ GX_Blend blend = face->blend;
+ FT_Error error;
+ FT_UInt i, j;
+ FT_ULong table_len;
+ FT_ULong gvar_start;
+ FT_ULong offsetToData;
+ GX_GVar_Head gvar_head;
+
+ static const FT_Frame_Field gvar_fields[] =
+ {
+
+#undef FT_STRUCTURE
+#define FT_STRUCTURE GX_GVar_Head
+
+ FT_FRAME_START( 20 ),
+ FT_FRAME_LONG ( version ),
+ FT_FRAME_USHORT( axisCount ),
+ FT_FRAME_USHORT( globalCoordCount ),
+ FT_FRAME_ULONG ( offsetToCoord ),
+ FT_FRAME_USHORT( glyphCount ),
+ FT_FRAME_USHORT( flags ),
+ FT_FRAME_ULONG ( offsetToData ),
+ FT_FRAME_END
+ };
+
+
+ FT_TRACE2(( "GVAR " ));
+
+ if ( ( error = face->goto_table( face,
+ TTAG_gvar,
+ stream,
+ &table_len ) ) != 0 )
+ {
+ FT_TRACE2(( "is missing\n" ));
+ goto Exit;
+ }
+
+ gvar_start = FT_STREAM_POS( );
+ if ( FT_STREAM_READ_FIELDS( gvar_fields, &gvar_head ) )
+ goto Exit;
+
+ if ( gvar_head.version != 0x00010000L )
+ {
+ FT_TRACE1(( "bad table version\n" ));
+ error = FT_THROW( Invalid_Table );
+ goto Exit;
+ }
+
+ if ( gvar_head.axisCount != (FT_UShort)blend->mmvar->num_axis )
+ {
+ FT_TRACE1(( "ft_var_load_gvar: number of axes in `gvar' and `cvar'\n"
+ " table are different\n" ));
+ error = FT_THROW( Invalid_Table );
+ goto Exit;
+ }
+
+ /* rough sanity check, ignoring offsets */
+ if ( (FT_ULong)gvar_head.globalCoordCount * gvar_head.axisCount >
+ table_len / 2 )
+ {
+ FT_TRACE1(( "ft_var_load_gvar:"
+ " invalid number of global coordinates\n" ));
+ error = FT_THROW( Invalid_Table );
+ goto Exit;
+ }
+
+ /* rough sanity check: offsets can be either 2 or 4 bytes, */
+ /* and a single variation needs at least 4 bytes per glyph */
+ if ( (FT_ULong)gvar_head.glyphCount *
+ ( ( gvar_head.flags & 1 ) ? 8 : 6 ) > table_len )
+ {
+ FT_TRACE1(( "ft_var_load_gvar: invalid number of glyphs\n" ));
+ error = FT_THROW( Invalid_Table );
+ goto Exit;
+ }
+
+ FT_TRACE2(( "loaded\n" ));
+
+ blend->gvar_size = table_len;
+ blend->tuplecount = gvar_head.globalCoordCount;
+ blend->gv_glyphcnt = gvar_head.glyphCount;
+ offsetToData = gvar_start + gvar_head.offsetToData;
+
+ FT_TRACE5(( "gvar: there are %d shared coordinates:\n",
+ blend->tuplecount ));
+
+ if ( FT_NEW_ARRAY( blend->glyphoffsets, blend->gv_glyphcnt + 1 ) )
+ goto Exit;
+
+ if ( gvar_head.flags & 1 )
+ {
+ /* long offsets (one more offset than glyphs, to mark size of last) */
+ if ( FT_FRAME_ENTER( ( blend->gv_glyphcnt + 1 ) * 4L ) )
+ goto Exit;
+
+ for ( i = 0; i <= blend->gv_glyphcnt; i++ )
+ blend->glyphoffsets[i] = offsetToData + FT_GET_ULONG();
+
+ FT_FRAME_EXIT();
+ }
+ else
+ {
+ /* short offsets (one more offset than glyphs, to mark size of last) */
+ if ( FT_FRAME_ENTER( ( blend->gv_glyphcnt + 1 ) * 2L ) )
+ goto Exit;
+
+ for ( i = 0; i <= blend->gv_glyphcnt; i++ )
+ blend->glyphoffsets[i] = offsetToData + FT_GET_USHORT() * 2;
+ /* XXX: Undocumented: `*2'! */
+
+ FT_FRAME_EXIT();
+ }
+
+ if ( blend->tuplecount != 0 )
+ {
+ if ( FT_NEW_ARRAY( blend->tuplecoords,
+ gvar_head.axisCount * blend->tuplecount ) )
+ goto Exit;
+
+ if ( FT_STREAM_SEEK( gvar_start + gvar_head.offsetToCoord ) ||
+ FT_FRAME_ENTER( blend->tuplecount * gvar_head.axisCount * 2L ) )
+ goto Exit;
+
+ for ( i = 0; i < blend->tuplecount; i++ )
+ {
+ FT_TRACE5(( " [ " ));
+ for ( j = 0 ; j < (FT_UInt)gvar_head.axisCount; j++ )
+ {
+ blend->tuplecoords[i * gvar_head.axisCount + j] =
+ FT_GET_SHORT() * 4; /* convert to FT_Fixed */
+ FT_TRACE5(( "%.4f ",
+ blend->tuplecoords[i * gvar_head.axisCount + j] / 65536.0 ));
+ }
+ FT_TRACE5(( "]\n" ));
+ }
+
+ FT_TRACE5(( "\n" ));
+
+ FT_FRAME_EXIT();
+ }
+
+ Exit:
+ return error;
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* ft_var_apply_tuple */
+ /* */
+ /* <Description> */
+ /* Figure out whether a given tuple (design) applies to the current */
+ /* blend, and if so, what is the scaling factor. */
+ /* */
+ /* <Input> */
+ /* blend :: The current blend of the font. */
+ /* */
+ /* tupleIndex :: A flag saying whether this is an intermediate */
+ /* tuple or not. */
+ /* */
+ /* tuple_coords :: The coordinates of the tuple in normalized axis */
+ /* units. */
+ /* */
+ /* im_start_coords :: The initial coordinates where this tuple starts */
+ /* to apply (for intermediate coordinates). */
+ /* */
+ /* im_end_coords :: The final coordinates after which this tuple no */
+ /* longer applies (for intermediate coordinates). */
+ /* */
+ /* <Return> */
+ /* An FT_Fixed value containing the scaling factor. */
+ /* */
+ static FT_Fixed
+ ft_var_apply_tuple( GX_Blend blend,
+ FT_UShort tupleIndex,
+ FT_Fixed* tuple_coords,
+ FT_Fixed* im_start_coords,
+ FT_Fixed* im_end_coords )
+ {
+ FT_UInt i;
+ FT_Fixed apply = 0x10000L;
+
+
+ for ( i = 0; i < blend->num_axis; i++ )
+ {
+ FT_TRACE6(( " axis coordinate %d (%.4f):\n",
+ i, blend->normalizedcoords[i] / 65536.0 ));
+
+ /* It's not clear why (for intermediate tuples) we don't need */
+ /* to check against start/end -- the documentation says we don't. */
+ /* Similarly, it's unclear why we don't need to scale along the */
+ /* axis. */
+
+ if ( tuple_coords[i] == 0 )
+ {
+ FT_TRACE6(( " tuple coordinate is zero, ignored\n", i ));
+ continue;
+ }
+
+ else if ( blend->normalizedcoords[i] == 0 )
+ {
+ FT_TRACE6(( " axis coordinate is zero, stop\n" ));
+ apply = 0;
+ break;
+ }
+
+ else if ( ( blend->normalizedcoords[i] < 0 && tuple_coords[i] > 0 ) ||
+ ( blend->normalizedcoords[i] > 0 && tuple_coords[i] < 0 ) )
+ {
+ FT_TRACE6(( " tuple coordinate value %.4f is exceeded, stop\n",
+ tuple_coords[i] / 65536.0 ));
+ apply = 0;
+ break;
+ }
+
+ else if ( !( tupleIndex & GX_TI_INTERMEDIATE_TUPLE ) )
+ {
+ FT_TRACE6(( " tuple coordinate value %.4f fits\n",
+ tuple_coords[i] / 65536.0 ));
+ /* not an intermediate tuple */
+ apply = FT_MulFix( apply,
+ blend->normalizedcoords[i] > 0
+ ? blend->normalizedcoords[i]
+ : -blend->normalizedcoords[i] );
+ }
+
+ else if ( blend->normalizedcoords[i] < im_start_coords[i] ||
+ blend->normalizedcoords[i] > im_end_coords[i] )
+ {
+ FT_TRACE6(( " intermediate tuple range [%.4f;%.4f] is exceeded,"
+ " stop\n",
+ im_start_coords[i] / 65536.0,
+ im_end_coords[i] / 65536.0 ));
+ apply = 0;
+ break;
+ }
+
+ else if ( blend->normalizedcoords[i] < tuple_coords[i] )
+ {
+ FT_TRACE6(( " intermediate tuple range [%.4f;%.4f] fits\n",
+ im_start_coords[i] / 65536.0,
+ im_end_coords[i] / 65536.0 ));
+ apply = FT_MulDiv( apply,
+ blend->normalizedcoords[i] - im_start_coords[i],
+ tuple_coords[i] - im_start_coords[i] );
+ }
+
+ else
+ {
+ FT_TRACE6(( " intermediate tuple range [%.4f;%.4f] fits\n",
+ im_start_coords[i] / 65536.0,
+ im_end_coords[i] / 65536.0 ));
+ apply = FT_MulDiv( apply,
+ im_end_coords[i] - blend->normalizedcoords[i],
+ im_end_coords[i] - tuple_coords[i] );
+ }
+ }
+
+ FT_TRACE6(( " apply factor is %.4f\n", apply / 65536.0 ));
+
+ return apply;
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** MULTIPLE MASTERS SERVICE FUNCTIONS *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+
+ typedef struct GX_FVar_Head_
+ {
+ FT_Long version;
+ FT_UShort offsetToData;
+ FT_UShort countSizePairs;
+ FT_UShort axisCount;
+ FT_UShort axisSize;
+ FT_UShort instanceCount;
+ FT_UShort instanceSize;
+
+ } GX_FVar_Head;
+
+
+ typedef struct fvar_axis_
+ {
+ FT_ULong axisTag;
+ FT_Fixed minValue;
+ FT_Fixed defaultValue;
+ FT_Fixed maxValue;
+ FT_UShort flags;
+ FT_UShort nameID;
+
+ } GX_FVar_Axis;
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* TT_Get_MM_Var */
+ /* */
+ /* <Description> */
+ /* Check that the font's `fvar' table is valid, parse it, and return */
+ /* those data. */
+ /* */
+ /* <InOut> */
+ /* face :: The font face. */
+ /* TT_Get_MM_Var initializes the blend structure. */
+ /* */
+ /* <Output> */
+ /* master :: The `fvar' data (must be freed by caller). Can be NULL, */
+ /* which makes this function simply load MM support. */
+ /* */
+ /* <Return> */
+ /* FreeType error code. 0 means success. */
+ /* */
+ FT_LOCAL_DEF( FT_Error )
+ TT_Get_MM_Var( TT_Face face,
+ FT_MM_Var* *master )
+ {
+ FT_Stream stream = face->root.stream;
+ FT_Memory memory = face->root.memory;
+ FT_ULong table_len;
+ FT_Error error = FT_Err_Ok;
+ FT_ULong fvar_start;
+ FT_Int i, j;
+ FT_MM_Var* mmvar = NULL;
+ FT_Fixed* next_coords;
+ FT_String* next_name;
+ FT_Var_Axis* a;
+ FT_Var_Named_Style* ns;
+ GX_FVar_Head fvar_head;
+
+ static const FT_Frame_Field fvar_fields[] =
+ {
+
+#undef FT_STRUCTURE
+#define FT_STRUCTURE GX_FVar_Head
+
+ FT_FRAME_START( 16 ),
+ FT_FRAME_LONG ( version ),
+ FT_FRAME_USHORT( offsetToData ),
+ FT_FRAME_USHORT( countSizePairs ),
+ FT_FRAME_USHORT( axisCount ),
+ FT_FRAME_USHORT( axisSize ),
+ FT_FRAME_USHORT( instanceCount ),
+ FT_FRAME_USHORT( instanceSize ),
+ FT_FRAME_END
+ };
+
+ static const FT_Frame_Field fvaraxis_fields[] =
+ {
+
+#undef FT_STRUCTURE
+#define FT_STRUCTURE GX_FVar_Axis
+
+ FT_FRAME_START( 20 ),
+ FT_FRAME_ULONG ( axisTag ),
+ FT_FRAME_LONG ( minValue ),
+ FT_FRAME_LONG ( defaultValue ),
+ FT_FRAME_LONG ( maxValue ),
+ FT_FRAME_USHORT( flags ),
+ FT_FRAME_USHORT( nameID ),
+ FT_FRAME_END
+ };
+
+
+ /* read the font data and set up the internal representation */
+ /* if not already done */
+
+ if ( face->blend == NULL )
+ {
+ FT_TRACE2(( "FVAR " ));
+
+ /* both `fvar' and `gvar' must be present */
+ if ( ( error = face->goto_table( face, TTAG_gvar,
+ stream, &table_len ) ) != 0 )
+ {
+ FT_TRACE1(( "\n"
+ "TT_Get_MM_Var: `gvar' table is missing\n" ));
+ goto Exit;
+ }
+
+ if ( ( error = face->goto_table( face, TTAG_fvar,
+ stream, &table_len ) ) != 0 )
+ {
+ FT_TRACE1(( "is missing\n" ));
+ goto Exit;
+ }
+
+ fvar_start = FT_STREAM_POS( );
+
+ if ( FT_STREAM_READ_FIELDS( fvar_fields, &fvar_head ) )
+ goto Exit;
+
+ if ( fvar_head.version != (FT_Long)0x00010000L ||
+#if 0
+ /* fonts like `JamRegular.ttf' have an incorrect value for */
+ /* `countSizePairs'; since value 2 is hard-coded in `fvar' */
+ /* version 1.0, we simply ignore it */
+ fvar_head.countSizePairs != 2 ||
+#endif
+ fvar_head.axisSize != 20 ||
+ /* axisCount limit implied by 16-bit instanceSize */
+ fvar_head.axisCount > 0x3FFE ||
+ fvar_head.instanceSize != 4 + 4 * fvar_head.axisCount ||
+ /* instanceCount limit implied by limited range of name IDs */
+ fvar_head.instanceCount > 0x7EFF ||
+ fvar_head.offsetToData + fvar_head.axisCount * 20U +
+ fvar_head.instanceCount * fvar_head.instanceSize > table_len )
+ {
+ FT_TRACE1(( "\n"
+ "TT_Get_MM_Var: invalid `fvar' header\n" ));
+ error = FT_THROW( Invalid_Table );
+ goto Exit;
+ }
+
+ FT_TRACE2(( "loaded\n" ));
+
+ FT_TRACE5(( "number of GX style axes: %d\n", fvar_head.axisCount ));
+
+ if ( FT_NEW( face->blend ) )
+ goto Exit;
+
+ /* cannot overflow 32-bit arithmetic because of limits above */
+ face->blend->mmvar_len =
+ sizeof ( FT_MM_Var ) +
+ fvar_head.axisCount * sizeof ( FT_Var_Axis ) +
+ fvar_head.instanceCount * sizeof ( FT_Var_Named_Style ) +
+ fvar_head.instanceCount * fvar_head.axisCount * sizeof ( FT_Fixed ) +
+ 5 * fvar_head.axisCount;
+
+ if ( FT_ALLOC( mmvar, face->blend->mmvar_len ) )
+ goto Exit;
+ face->blend->mmvar = mmvar;
+
+ /* set up pointers and offsets into the `mmvar' array; */
+ /* the data gets filled in later on */
+
+ mmvar->num_axis =
+ fvar_head.axisCount;
+ mmvar->num_designs =
+ ~0U; /* meaningless in this context; each glyph */
+ /* may have a different number of designs */
+ /* (or tuples, as called by Apple) */
+ mmvar->num_namedstyles =
+ fvar_head.instanceCount;
+ mmvar->axis =
+ (FT_Var_Axis*)&( mmvar[1] );
+ mmvar->namedstyle =
+ (FT_Var_Named_Style*)&( mmvar->axis[fvar_head.axisCount] );
+
+ next_coords =
+ (FT_Fixed*)&( mmvar->namedstyle[fvar_head.instanceCount] );
+ for ( i = 0; i < fvar_head.instanceCount; i++ )
+ {
+ mmvar->namedstyle[i].coords = next_coords;
+ next_coords += fvar_head.axisCount;
+ }
+
+ next_name = (FT_String*)next_coords;
+ for ( i = 0; i < fvar_head.axisCount; i++ )
+ {
+ mmvar->axis[i].name = next_name;
+ next_name += 5;
+ }
+
+ /* now fill in the data */
+
+ if ( FT_STREAM_SEEK( fvar_start + fvar_head.offsetToData ) )
+ goto Exit;
+
+ a = mmvar->axis;
+ for ( i = 0; i < fvar_head.axisCount; i++ )
+ {
+ GX_FVar_Axis axis_rec;
+
+
+ if ( FT_STREAM_READ_FIELDS( fvaraxis_fields, &axis_rec ) )
+ goto Exit;
+ a->tag = axis_rec.axisTag;
+ a->minimum = axis_rec.minValue;
+ a->def = axis_rec.defaultValue;
+ a->maximum = axis_rec.maxValue;
+ a->strid = axis_rec.nameID;
+
+ a->name[0] = (FT_String)( a->tag >> 24 );
+ a->name[1] = (FT_String)( ( a->tag >> 16 ) & 0xFF );
+ a->name[2] = (FT_String)( ( a->tag >> 8 ) & 0xFF );
+ a->name[3] = (FT_String)( ( a->tag ) & 0xFF );
+ a->name[4] = '\0';
+
+ FT_TRACE5(( " \"%s\": minimum=%.4f, default=%.4f, maximum=%.4f\n",
+ a->name,
+ a->minimum / 65536.0,
+ a->def / 65536.0,
+ a->maximum / 65536.0 ));
+
+ a++;
+ }
+
+ FT_TRACE5(( "\n" ));
+
+ ns = mmvar->namedstyle;
+ for ( i = 0; i < fvar_head.instanceCount; i++, ns++ )
+ {
+ if ( FT_FRAME_ENTER( 4L + 4L * fvar_head.axisCount ) )
+ goto Exit;
+
+ ns->strid = FT_GET_USHORT();
+ (void) /* flags = */ FT_GET_USHORT();
+
+ for ( j = 0; j < fvar_head.axisCount; j++ )
+ ns->coords[j] = FT_GET_LONG();
+
+ FT_FRAME_EXIT();
+ }
+ }
+
+ /* fill the output array if requested */
+
+ if ( master != NULL )
+ {
+ FT_UInt n;
+
+
+ if ( FT_ALLOC( mmvar, face->blend->mmvar_len ) )
+ goto Exit;
+ FT_MEM_COPY( mmvar, face->blend->mmvar, face->blend->mmvar_len );
+
+ mmvar->axis =
+ (FT_Var_Axis*)&( mmvar[1] );
+ mmvar->namedstyle =
+ (FT_Var_Named_Style*)&( mmvar->axis[mmvar->num_axis] );
+ next_coords =
+ (FT_Fixed*)&( mmvar->namedstyle[mmvar->num_namedstyles] );
+
+ for ( n = 0; n < mmvar->num_namedstyles; n++ )
+ {
+ mmvar->namedstyle[n].coords = next_coords;
+ next_coords += mmvar->num_axis;
+ }
+
+ a = mmvar->axis;
+ next_name = (FT_String*)next_coords;
+ for ( n = 0; n < mmvar->num_axis; n++ )
+ {
+ a->name = next_name;
+
+ /* standard PostScript names for some standard apple tags */
+ if ( a->tag == TTAG_wght )
+ a->name = (char*)"Weight";
+ else if ( a->tag == TTAG_wdth )
+ a->name = (char*)"Width";
+ else if ( a->tag == TTAG_opsz )
+ a->name = (char*)"OpticalSize";
+ else if ( a->tag == TTAG_slnt )
+ a->name = (char*)"Slant";
+
+ next_name += 5;
+ a++;
+ }
+
+ *master = mmvar;
+ }
+
+ Exit:
+ return error;
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* TT_Set_MM_Blend */
+ /* */
+ /* <Description> */
+ /* Set the blend (normalized) coordinates for this instance of the */
+ /* font. Check that the `gvar' table is reasonable and does some */
+ /* initial preparation. */
+ /* */
+ /* <InOut> */
+ /* face :: The font. */
+ /* Initialize the blend structure with `gvar' data. */
+ /* */
+ /* <Input> */
+ /* num_coords :: The number of available coordinates. If it is */
+ /* larger than the number of axes, ignore the excess */
+ /* values. If it is smaller than the number of axes, */
+ /* use the default value (0) for the remaining axes. */
+ /* */
+ /* coords :: An array of `num_coords', each between [-1,1]. */
+ /* */
+ /* <Return> */
+ /* FreeType error code. 0 means success. */
+ /* */
+ FT_LOCAL_DEF( FT_Error )
+ TT_Set_MM_Blend( TT_Face face,
+ FT_UInt num_coords,
+ FT_Fixed* coords )
+ {
+ FT_Error error = FT_Err_Ok;
+ GX_Blend blend;
+ FT_MM_Var* mmvar;
+ FT_UInt i;
+ FT_Memory memory = face->root.memory;
+
+ enum
+ {
+ mcvt_retain,
+ mcvt_modify,
+ mcvt_load
+
+ } manageCvt;
+
+
+ face->doblend = FALSE;
+
+ if ( face->blend == NULL )
+ {
+ if ( ( error = TT_Get_MM_Var( face, NULL ) ) != 0 )
+ goto Exit;
+ }
+
+ blend = face->blend;
+ mmvar = blend->mmvar;
+
+ if ( num_coords > mmvar->num_axis )
+ {
+ FT_TRACE2(( "TT_Set_MM_Blend: only using first %d of %d coordinates\n",
+ mmvar->num_axis, num_coords ));
+ num_coords = mmvar->num_axis;
+ }
+
+ FT_TRACE5(( "normalized design coordinates:\n" ));
+
+ for ( i = 0; i < num_coords; i++ )
+ {
+ FT_TRACE5(( " %.4f\n", coords[i] / 65536.0 ));
+ if ( coords[i] < -0x00010000L || coords[i] > 0x00010000L )
+ {
+ FT_TRACE1(( "TT_Set_MM_Blend: normalized design coordinate %.4f\n"
+ " is out of range [-1;1]\n",
+ coords[i] / 65536.0 ));
+ error = FT_THROW( Invalid_Argument );
+ goto Exit;
+ }
+ }
+
+ FT_TRACE5(( "\n" ));
+
+ if ( blend->glyphoffsets == NULL )
+ if ( ( error = ft_var_load_gvar( face ) ) != 0 )
+ goto Exit;
+
+ if ( blend->normalizedcoords == NULL )
+ {
+ if ( FT_NEW_ARRAY( blend->normalizedcoords, mmvar->num_axis ) )
+ goto Exit;
+
+ manageCvt = mcvt_modify;
+
+ /* If we have not set the blend coordinates before this, then the */
+ /* cvt table will still be what we read from the `cvt ' table and */
+ /* we don't need to reload it. We may need to change it though... */
+ }
+ else
+ {
+ manageCvt = mcvt_retain;
+
+ for ( i = 0; i < num_coords; i++ )
+ {
+ if ( blend->normalizedcoords[i] != coords[i] )
+ {
+ manageCvt = mcvt_load;
+ break;
+ }
+ }
+
+ for ( ; i < mmvar->num_axis; i++ )
+ {
+ if ( blend->normalizedcoords[i] != 0 )
+ {
+ manageCvt = mcvt_load;
+ break;
+ }
+ }
+
+ /* If we don't change the blend coords then we don't need to do */
+ /* anything to the cvt table. It will be correct. Otherwise we */
+ /* no longer have the original cvt (it was modified when we set */
+ /* the blend last time), so we must reload and then modify it. */
+ }
+
+ blend->num_axis = mmvar->num_axis;
+ FT_MEM_COPY( blend->normalizedcoords,
+ coords,
+ num_coords * sizeof ( FT_Fixed ) );
+
+ face->doblend = TRUE;
+
+ if ( face->cvt != NULL )
+ {
+ switch ( manageCvt )
+ {
+ case mcvt_load:
+ /* The cvt table has been loaded already; every time we change the */
+ /* blend we may need to reload and remodify the cvt table. */
+ FT_FREE( face->cvt );
+ face->cvt = NULL;
+
+ error = tt_face_load_cvt( face, face->root.stream );
+ break;
+
+ case mcvt_modify:
+ /* The original cvt table is in memory. All we need to do is */
+ /* apply the `cvar' table (if any). */
+ error = tt_face_vary_cvt( face, face->root.stream );
+ break;
+
+ case mcvt_retain:
+ /* The cvt table is correct for this set of coordinates. */
+ break;
+ }
+ }
+
+ Exit:
+ return error;
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* TT_Set_Var_Design */
+ /* */
+ /* <Description> */
+ /* Set the coordinates for the instance, measured in the user */
+ /* coordinate system. Parse the `avar' table (if present) to convert */
+ /* from user to normalized coordinates. */
+ /* */
+ /* <InOut> */
+ /* face :: The font face. */
+ /* Initialize the blend struct with `gvar' data. */
+ /* */
+ /* <Input> */
+ /* num_coords :: The number of available coordinates. If it is */
+ /* larger than the number of axes, ignore the excess */
+ /* values. If it is smaller than the number of axes, */
+ /* use the default values for the remaining axes. */
+ /* */
+ /* coords :: A coordinate array with `num_coords' elements. */
+ /* */
+ /* <Return> */
+ /* FreeType error code. 0 means success. */
+ /* */
+ FT_LOCAL_DEF( FT_Error )
+ TT_Set_Var_Design( TT_Face face,
+ FT_UInt num_coords,
+ FT_Fixed* coords )
+ {
+ FT_Error error = FT_Err_Ok;
+ FT_Fixed* normalized = NULL;
+ GX_Blend blend;
+ FT_MM_Var* mmvar;
+ FT_UInt i, j;
+ FT_Var_Axis* a;
+ GX_AVarSegment av;
+ FT_Memory memory = face->root.memory;
+
+
+ if ( face->blend == NULL )
+ {
+ if ( ( error = TT_Get_MM_Var( face, NULL ) ) != 0 )
+ goto Exit;
+ }
+
+ blend = face->blend;
+ mmvar = blend->mmvar;
+
+ if ( num_coords > mmvar->num_axis )
+ {
+ FT_TRACE2(( "TT_Set_Var_Design:"
+ " only using first %d of %d coordinates\n",
+ mmvar->num_axis, num_coords ));
+ num_coords = mmvar->num_axis;
+ }
+
+ /* Axis normalization is a two stage process. First we normalize */
+ /* based on the [min,def,max] values for the axis to be [-1,0,1]. */
+ /* Then, if there's an `avar' table, we renormalize this range. */
+
+ if ( FT_NEW_ARRAY( normalized, mmvar->num_axis ) )
+ goto Exit;
+
+ FT_TRACE5(( "design coordinates:\n" ));
+
+ a = mmvar->axis;
+ for ( i = 0; i < num_coords; i++, a++ )
+ {
+ FT_TRACE5(( " %.4f\n", coords[i] / 65536.0 ));
+ if ( coords[i] > a->maximum || coords[i] < a->minimum )
+ {
+ FT_TRACE1(( "TT_Set_Var_Design: normalized design coordinate %.4f\n"
+ " is out of range [%.4f;%.4f]\n",
+ coords[i] / 65536.0,
+ a->minimum / 65536.0,
+ a->maximum / 65536.0 ));
+ error = FT_THROW( Invalid_Argument );
+ goto Exit;
+ }
+
+ if ( coords[i] < a->def )
+ normalized[i] = -FT_DivFix( coords[i] - a->def,
+ a->minimum - a->def );
+ else if ( a->maximum == a->def )
+ normalized[i] = 0;
+ else
+ normalized[i] = FT_DivFix( coords[i] - a->def,
+ a->maximum - a->def );
+ }
+
+ FT_TRACE5(( "\n" ));
+
+ for ( ; i < mmvar->num_axis; i++ )
+ normalized[i] = 0;
+
+ if ( !blend->avar_checked )
+ ft_var_load_avar( face );
+
+ if ( blend->avar_segment != NULL )
+ {
+ FT_TRACE5(( "normalized design coordinates"
+ " before applying `avar' data:\n" ));
+
+ av = blend->avar_segment;
+ for ( i = 0; i < mmvar->num_axis; i++, av++ )
+ {
+ for ( j = 1; j < (FT_UInt)av->pairCount; j++ )
+ {
+ FT_TRACE5(( " %.4f\n", normalized[i] / 65536.0 ));
+ if ( normalized[i] < av->correspondence[j].fromCoord )
+ {
+ normalized[i] =
+ FT_MulDiv( normalized[i] - av->correspondence[j - 1].fromCoord,
+ av->correspondence[j].toCoord -
+ av->correspondence[j - 1].toCoord,
+ av->correspondence[j].fromCoord -
+ av->correspondence[j - 1].fromCoord ) +
+ av->correspondence[j - 1].toCoord;
+ break;
+ }
+ }
+ }
+ }
+
+ error = TT_Set_MM_Blend( face, mmvar->num_axis, normalized );
+
+ Exit:
+ FT_FREE( normalized );
+ return error;
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** GX VAR PARSING ROUTINES *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* tt_face_vary_cvt */
+ /* */
+ /* <Description> */
+ /* Modify the loaded cvt table according to the `cvar' table and the */
+ /* font's blend. */
+ /* */
+ /* <InOut> */
+ /* face :: A handle to the target face object. */
+ /* */
+ /* <Input> */
+ /* stream :: A handle to the input stream. */
+ /* */
+ /* <Return> */
+ /* FreeType error code. 0 means success. */
+ /* */
+ /* Most errors are ignored. It is perfectly valid not to have a */
+ /* `cvar' table even if there is a `gvar' and `fvar' table. */
+ /* */
+ FT_LOCAL_DEF( FT_Error )
+ tt_face_vary_cvt( TT_Face face,
+ FT_Stream stream )
+ {
+ FT_Error error;
+ FT_Memory memory = stream->memory;
+ FT_ULong table_start;
+ FT_ULong table_len;
+ FT_UInt tupleCount;
+ FT_ULong offsetToData;
+ FT_ULong here;
+ FT_UInt i, j;
+ FT_Fixed* tuple_coords = NULL;
+ FT_Fixed* im_start_coords = NULL;
+ FT_Fixed* im_end_coords = NULL;
+ GX_Blend blend = face->blend;
+ FT_UInt point_count;
+ FT_UShort* localpoints;
+ FT_Short* deltas;
+
+
+ FT_TRACE2(( "CVAR " ));
+
+ if ( blend == NULL )
+ {
+ FT_TRACE2(( "\n"
+ "tt_face_vary_cvt: no blend specified\n" ));
+ error = FT_Err_Ok;
+ goto Exit;
+ }
+
+ if ( face->cvt == NULL )
+ {
+ FT_TRACE2(( "\n"
+ "tt_face_vary_cvt: no `cvt ' table\n" ));
+ error = FT_Err_Ok;
+ goto Exit;
+ }
+
+ error = face->goto_table( face, TTAG_cvar, stream, &table_len );
+ if ( error )
+ {
+ FT_TRACE2(( "is missing\n" ));
+
+ error = FT_Err_Ok;
+ goto Exit;
+ }
+
+ if ( FT_FRAME_ENTER( table_len ) )
+ {
+ error = FT_Err_Ok;
+ goto Exit;
+ }
+
+ table_start = FT_Stream_FTell( stream );
+ if ( FT_GET_LONG() != 0x00010000L )
+ {
+ FT_TRACE2(( "bad table version\n" ));
+
+ error = FT_Err_Ok;
+ goto FExit;
+ }
+
+ FT_TRACE2(( "loaded\n" ));
+
+ if ( FT_NEW_ARRAY( tuple_coords, blend->num_axis ) ||
+ FT_NEW_ARRAY( im_start_coords, blend->num_axis ) ||
+ FT_NEW_ARRAY( im_end_coords, blend->num_axis ) )
+ goto FExit;
+
+ tupleCount = FT_GET_USHORT();
+ offsetToData = FT_GET_USHORT();
+
+ /* rough sanity test */
+ if ( offsetToData + tupleCount * 4 > table_len )
+ {
+ FT_TRACE2(( "tt_face_vary_cvt:"
+ " invalid CVT variation array header\n" ));
+
+ error = FT_THROW( Invalid_Table );
+ goto FExit;
+ }
+
+ offsetToData += table_start;
+
+ /* The documentation implies there are flags packed into */
+ /* `tupleCount', but John Jenkins says that shared points don't apply */
+ /* to `cvar', and no other flags are defined. */
+
+ FT_TRACE5(( "cvar: there are %d tuples:\n", tupleCount & 0xFFF ));
+
+ for ( i = 0; i < ( tupleCount & 0xFFF ); i++ )
+ {
+ FT_UInt tupleDataSize;
+ FT_UInt tupleIndex;
+ FT_Fixed apply;
+
+
+ FT_TRACE6(( " tuple %d:\n", i ));
+
+ tupleDataSize = FT_GET_USHORT();
+ tupleIndex = FT_GET_USHORT();
+
+ /* There is no provision here for a global tuple coordinate section, */
+ /* so John says. There are no tuple indices, just embedded tuples. */
+
+ if ( tupleIndex & GX_TI_EMBEDDED_TUPLE_COORD )
+ {
+ for ( j = 0; j < blend->num_axis; j++ )
+ tuple_coords[j] = FT_GET_SHORT() * 4; /* convert from */
+ /* short frac to fixed */
+ }
+ else
+ {
+ /* skip this tuple; it makes no sense */
+
+ if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE )
+ for ( j = 0; j < 2 * blend->num_axis; j++ )
+ (void)FT_GET_SHORT();
+
+ offsetToData += tupleDataSize;
+ continue;
+ }
+
+ if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE )
+ {
+ for ( j = 0; j < blend->num_axis; j++ )
+ im_start_coords[j] = FT_GET_SHORT() * 4;
+ for ( j = 0; j < blend->num_axis; j++ )
+ im_end_coords[j] = FT_GET_SHORT() * 4;
+ }
+
+ apply = ft_var_apply_tuple( blend,
+ (FT_UShort)tupleIndex,
+ tuple_coords,
+ im_start_coords,
+ im_end_coords );
+ if ( /* tuple isn't active for our blend */
+ apply == 0 ||
+ /* global points not allowed, */
+ /* if they aren't local, makes no sense */
+ !( tupleIndex & GX_TI_PRIVATE_POINT_NUMBERS ) )
+ {
+ offsetToData += tupleDataSize;
+ continue;
+ }
+
+ here = FT_Stream_FTell( stream );
+
+ FT_Stream_SeekSet( stream, offsetToData );
+
+ localpoints = ft_var_readpackedpoints( stream,
+ table_len,
+ &point_count );
+ deltas = ft_var_readpackeddeltas( stream,
+ table_len,
+ point_count == 0 ? face->cvt_size
+ : point_count );
+ if ( localpoints == NULL || deltas == NULL )
+ ; /* failure, ignore it */
+
+ else if ( localpoints == ALL_POINTS )
+ {
+#ifdef FT_DEBUG_LEVEL_TRACE
+ int count = 0;
+#endif
+
+
+ FT_TRACE7(( " CVT deltas:\n" ));
+
+ /* this means that there are deltas for every entry in cvt */
+ for ( j = 0; j < face->cvt_size; j++ )
+ {
+ FT_Long orig_cvt = face->cvt[j];
+
+
+ face->cvt[j] = (FT_Short)( orig_cvt +
+ FT_MulFix( deltas[j], apply ) );
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+ if ( orig_cvt != face->cvt[j] )
+ {
+ FT_TRACE7(( " %d: %d -> %d\n",
+ j, orig_cvt, face->cvt[j] ));
+ count++;
+ }
+#endif
+ }
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+ if ( !count )
+ FT_TRACE7(( " none\n" ));
+#endif
+ }
+
+ else
+ {
+#ifdef FT_DEBUG_LEVEL_TRACE
+ int count = 0;
+#endif
+
+
+ FT_TRACE7(( " CVT deltas:\n" ));
+
+ for ( j = 0; j < point_count; j++ )
+ {
+ int pindex = localpoints[j];
+ FT_Long orig_cvt = face->cvt[pindex];
+
+
+ face->cvt[pindex] = (FT_Short)( orig_cvt +
+ FT_MulFix( deltas[j], apply ) );
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+ if ( orig_cvt != face->cvt[pindex] )
+ {
+ FT_TRACE7(( " %d: %d -> %d\n",
+ pindex, orig_cvt, face->cvt[pindex] ));
+ count++;
+ }
+#endif
+ }
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+ if ( !count )
+ FT_TRACE7(( " none\n" ));
+#endif
+ }
+
+ if ( localpoints != ALL_POINTS )
+ FT_FREE( localpoints );
+ FT_FREE( deltas );
+
+ offsetToData += tupleDataSize;
+
+ FT_Stream_SeekSet( stream, here );
+ }
+
+ FT_TRACE5(( "\n" ));
+
+ FExit:
+ FT_FRAME_EXIT();
+
+ Exit:
+ FT_FREE( tuple_coords );
+ FT_FREE( im_start_coords );
+ FT_FREE( im_end_coords );
+
+ return error;
+ }
+
+
+ /* Shift the original coordinates of all points between indices `p1' */
+ /* and `p2', using the same difference as given by index `ref'. */
+
+ /* modeled after `af_iup_shift' */
+
+ static void
+ tt_delta_shift( int p1,
+ int p2,
+ int ref,
+ FT_Vector* in_points,
+ FT_Vector* out_points )
+ {
+ int p;
+ FT_Vector delta;
+
+
+ delta.x = out_points[ref].x - in_points[ref].x;
+ delta.y = out_points[ref].y - in_points[ref].y;
+
+ if ( delta.x == 0 && delta.y == 0 )
+ return;
+
+ for ( p = p1; p < ref; p++ )
+ {
+ out_points[p].x += delta.x;
+ out_points[p].y += delta.y;
+ }
+
+ for ( p = ref + 1; p <= p2; p++ )
+ {
+ out_points[p].x += delta.x;
+ out_points[p].y += delta.y;
+ }
+ }
+
+
+ /* Interpolate the original coordinates of all points with indices */
+ /* between `p1' and `p2', using `ref1' and `ref2' as the reference */
+ /* point indices. */
+
+ /* modeled after `af_iup_interp', `_iup_worker_interpolate', and */
+ /* `Ins_IUP' */
+
+ static void
+ tt_delta_interpolate( int p1,
+ int p2,
+ int ref1,
+ int ref2,
+ FT_Vector* in_points,
+ FT_Vector* out_points )
+ {
+ int p, i;
+
+ FT_Pos out, in1, in2, out1, out2, d1, d2;
+
+
+ if ( p1 > p2 )
+ return;
+
+ /* handle both horizontal and vertical coordinates */
+ for ( i = 0; i <= 1; i++ )
+ {
+ /* shift array pointers so that we can access `foo.y' as `foo.x' */
+ in_points = (FT_Vector*)( (FT_Pos*)in_points + i );
+ out_points = (FT_Vector*)( (FT_Pos*)out_points + i );
+
+ if ( in_points[ref1].x > in_points[ref2].x )
+ {
+ p = ref1;
+ ref1 = ref2;
+ ref2 = p;
+ }
+
+ in1 = in_points[ref1].x;
+ in2 = in_points[ref2].x;
+ out1 = out_points[ref1].x;
+ out2 = out_points[ref2].x;
+ d1 = out1 - in1;
+ d2 = out2 - in2;
+
+ if ( out1 == out2 || in1 == in2 )
+ {
+ for ( p = p1; p <= p2; p++ )
+ {
+ out = in_points[p].x;
+
+ if ( out <= in1 )
+ out += d1;
+ else if ( out >= in2 )
+ out += d2;
+ else
+ out = out1;
+
+ out_points[p].x = out;
+ }
+ }
+ else
+ {
+ FT_Fixed scale = FT_DivFix( out2 - out1, in2 - in1 );
+
+
+ for ( p = p1; p <= p2; p++ )
+ {
+ out = in_points[p].x;
+
+ if ( out <= in1 )
+ out += d1;
+ else if ( out >= in2 )
+ out += d2;
+ else
+ out = out1 + FT_MulFix( out - in1, scale );
+
+ out_points[p].x = out;
+ }
+ }
+ }
+ }
+
+
+ /* Interpolate points without delta values, similar to */
+ /* the `IUP' hinting instruction. */
+
+ /* modeled after `Ins_IUP */
+
+ static void
+ tt_handle_deltas( FT_Outline* outline,
+ FT_Vector* in_points,
+ FT_Bool* has_delta )
+ {
+ FT_Vector* out_points;
+
+ FT_Int first_point;
+ FT_Int end_point;
+
+ FT_Int first_delta;
+ FT_Int cur_delta;
+
+ FT_Int point;
+ FT_Short contour;
+
+
+ /* ignore empty outlines */
+ if ( !outline->n_contours )
+ return;
+
+ out_points = outline->points;
+
+ contour = 0;
+ point = 0;
+
+ do
+ {
+ end_point = outline->contours[contour];
+ first_point = point;
+
+ /* search first point that has a delta */
+ while ( point <= end_point && !has_delta[point] )
+ point++;
+
+ if ( point <= end_point )
+ {
+ first_delta = point;
+ cur_delta = point;
+
+ point++;
+
+ while ( point <= end_point )
+ {
+ /* search next point that has a delta */
+ /* and interpolate intermediate points */
+ if ( has_delta[point] )
+ {
+ tt_delta_interpolate( cur_delta + 1,
+ point - 1,
+ cur_delta,
+ point,
+ in_points,
+ out_points );
+ cur_delta = point;
+ }
+
+ point++;
+ }
+
+ /* shift contour if we only have a single delta */
+ if ( cur_delta == first_delta )
+ tt_delta_shift( first_point,
+ end_point,
+ cur_delta,
+ in_points,
+ out_points );
+ else
+ {
+ /* otherwise handle remaining points */
+ /* at the end and beginning of the contour */
+ tt_delta_interpolate( cur_delta + 1,
+ end_point,
+ cur_delta,
+ first_delta,
+ in_points,
+ out_points );
+
+ if ( first_delta > 0 )
+ tt_delta_interpolate( first_point,
+ first_delta - 1,
+ cur_delta,
+ first_delta,
+ in_points,
+ out_points );
+ }
+ }
+ contour++;
+
+ } while ( contour < outline->n_contours );
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* TT_Vary_Apply_Glyph_Deltas */
+ /* */
+ /* <Description> */
+ /* Apply the appropriate deltas to the current glyph. */
+ /* */
+ /* <Input> */
+ /* face :: A handle to the target face object. */
+ /* */
+ /* glyph_index :: The index of the glyph being modified. */
+ /* */
+ /* n_points :: The number of the points in the glyph, including */
+ /* phantom points. */
+ /* */
+ /* <InOut> */
+ /* outline :: The outline to change. */
+ /* */
+ /* <Return> */
+ /* FreeType error code. 0 means success. */
+ /* */
+ FT_LOCAL_DEF( FT_Error )
+ TT_Vary_Apply_Glyph_Deltas( TT_Face face,
+ FT_UInt glyph_index,
+ FT_Outline* outline,
+ FT_UInt n_points )
+ {
+ FT_Stream stream = face->root.stream;
+ FT_Memory memory = stream->memory;
+ GX_Blend blend = face->blend;
+
+ FT_Vector* points_org = NULL;
+ FT_Bool* has_delta = NULL;
+
+ FT_Error error;
+ FT_ULong glyph_start;
+ FT_UInt tupleCount;
+ FT_ULong offsetToData;
+ FT_ULong here;
+ FT_UInt i, j;
+ FT_Fixed* tuple_coords = NULL;
+ FT_Fixed* im_start_coords = NULL;
+ FT_Fixed* im_end_coords = NULL;
+ FT_UInt point_count, spoint_count = 0;
+ FT_UShort* sharedpoints = NULL;
+ FT_UShort* localpoints = NULL;
+ FT_UShort* points;
+ FT_Short *deltas_x, *deltas_y;
+
+
+ if ( !face->doblend || blend == NULL )
+ return FT_THROW( Invalid_Argument );
+
+ if ( glyph_index >= blend->gv_glyphcnt ||
+ blend->glyphoffsets[glyph_index] ==
+ blend->glyphoffsets[glyph_index + 1] )
+ {
+ FT_TRACE2(( "TT_Vary_Apply_Glyph_Deltas:"
+ " no variation data for this glyph\n" ));
+ return FT_Err_Ok;
+ }
+
+ if ( FT_NEW_ARRAY( points_org, n_points ) ||
+ FT_NEW_ARRAY( has_delta, n_points ) )
+ goto Fail1;
+
+ if ( FT_STREAM_SEEK( blend->glyphoffsets[glyph_index] ) ||
+ FT_FRAME_ENTER( blend->glyphoffsets[glyph_index + 1] -
+ blend->glyphoffsets[glyph_index] ) )
+ goto Fail1;
+
+ glyph_start = FT_Stream_FTell( stream );
+
+ /* each set of glyph variation data is formatted similarly to `cvar' */
+ /* (except we get shared points and global tuples) */
+
+ if ( FT_NEW_ARRAY( tuple_coords, blend->num_axis ) ||
+ FT_NEW_ARRAY( im_start_coords, blend->num_axis ) ||
+ FT_NEW_ARRAY( im_end_coords, blend->num_axis ) )
+ goto Fail2;
+
+ tupleCount = FT_GET_USHORT();
+ offsetToData = FT_GET_USHORT();
+
+ /* rough sanity test */
+ if ( offsetToData + tupleCount * 4 > blend->gvar_size )
+ {
+ FT_TRACE2(( "TT_Vary_Apply_Glyph_Deltas:"
+ " invalid glyph variation array header\n" ));
+
+ error = FT_THROW( Invalid_Table );
+ goto Fail2;
+ }
+
+ offsetToData += glyph_start;
+
+ if ( tupleCount & GX_TC_TUPLES_SHARE_POINT_NUMBERS )
+ {
+ here = FT_Stream_FTell( stream );
+
+ FT_Stream_SeekSet( stream, offsetToData );
+
+ sharedpoints = ft_var_readpackedpoints( stream,
+ blend->gvar_size,
+ &spoint_count );
+ offsetToData = FT_Stream_FTell( stream );
+
+ FT_Stream_SeekSet( stream, here );
+ }
+
+ FT_TRACE5(( "gvar: there are %d tuples:\n",
+ tupleCount & GX_TC_TUPLE_COUNT_MASK ));
+
+ for ( i = 0; i < ( tupleCount & GX_TC_TUPLE_COUNT_MASK ); i++ )
+ {
+ FT_UInt tupleDataSize;
+ FT_UInt tupleIndex;
+ FT_Fixed apply;
+
+
+ FT_TRACE6(( " tuple %d:\n", i ));
+
+ tupleDataSize = FT_GET_USHORT();
+ tupleIndex = FT_GET_USHORT();
+
+ if ( tupleIndex & GX_TI_EMBEDDED_TUPLE_COORD )
+ {
+ for ( j = 0; j < blend->num_axis; j++ )
+ tuple_coords[j] = FT_GET_SHORT() * 4; /* convert from */
+ /* short frac to fixed */
+ }
+ else if ( ( tupleIndex & GX_TI_TUPLE_INDEX_MASK ) >= blend->tuplecount )
+ {
+ FT_TRACE2(( "TT_Vary_Apply_Glyph_Deltas:"
+ " invalid tuple index\n" ));
+
+ error = FT_THROW( Invalid_Table );
+ goto Fail2;
+ }
+ else
+ FT_MEM_COPY(
+ tuple_coords,
+ &blend->tuplecoords[( tupleIndex & 0xFFF ) * blend->num_axis],
+ blend->num_axis * sizeof ( FT_Fixed ) );
+
+ if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE )
+ {
+ for ( j = 0; j < blend->num_axis; j++ )
+ im_start_coords[j] = FT_GET_SHORT() * 4;
+ for ( j = 0; j < blend->num_axis; j++ )
+ im_end_coords[j] = FT_GET_SHORT() * 4;
+ }
+
+ apply = ft_var_apply_tuple( blend,
+ (FT_UShort)tupleIndex,
+ tuple_coords,
+ im_start_coords,
+ im_end_coords );
+
+ if ( apply == 0 ) /* tuple isn't active for our blend */
+ {
+ offsetToData += tupleDataSize;
+ continue;
+ }
+
+ here = FT_Stream_FTell( stream );
+
+ if ( tupleIndex & GX_TI_PRIVATE_POINT_NUMBERS )
+ {
+ FT_Stream_SeekSet( stream, offsetToData );
+
+ localpoints = ft_var_readpackedpoints( stream,
+ blend->gvar_size,
+ &point_count );
+ points = localpoints;
+ }
+ else
+ {
+ points = sharedpoints;
+ point_count = spoint_count;
+ }
+
+ deltas_x = ft_var_readpackeddeltas( stream,
+ blend->gvar_size,
+ point_count == 0 ? n_points
+ : point_count );
+ deltas_y = ft_var_readpackeddeltas( stream,
+ blend->gvar_size,
+ point_count == 0 ? n_points
+ : point_count );
+
+ if ( points == NULL || deltas_y == NULL || deltas_x == NULL )
+ ; /* failure, ignore it */
+
+ else if ( points == ALL_POINTS )
+ {
+#ifdef FT_DEBUG_LEVEL_TRACE
+ int count = 0;
+#endif
+
+
+ FT_TRACE7(( " point deltas:\n" ));
+
+ /* this means that there are deltas for every point in the glyph */
+ for ( j = 0; j < n_points; j++ )
+ {
+#ifdef FT_DEBUG_LEVEL_TRACE
+ FT_Vector point_org = outline->points[j];
+#endif
+
+
+ outline->points[j].x += FT_MulFix( deltas_x[j], apply );
+ outline->points[j].y += FT_MulFix( deltas_y[j], apply );
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+ if ( ( point_org.x != outline->points[j].x ) ||
+ ( point_org.y != outline->points[j].y ) )
+ {
+ FT_TRACE7(( " %d: (%d, %d) -> (%d, %d)\n",
+ j,
+ point_org.x,
+ point_org.y,
+ outline->points[j].x,
+ outline->points[j].y ));
+ count++;
+ }
+#endif
+ }
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+ if ( !count )
+ FT_TRACE7(( " none\n" ));
+#endif
+ }
+
+ else if ( localpoints == NULL )
+ ; /* failure, ignore it */
+
+ else
+ {
+#ifdef FT_DEBUG_LEVEL_TRACE
+ int count = 0;
+#endif
+
+
+ /* we have to interpolate the missing deltas similar to the */
+ /* IUP bytecode instruction */
+ for ( j = 0; j < n_points; j++ )
+ {
+ points_org[j] = outline->points[j];
+ has_delta[j] = FALSE;
+ }
+
+ for ( j = 0; j < point_count; j++ )
+ {
+ FT_UShort idx = localpoints[j];
+
+
+ if ( idx >= n_points )
+ continue;
+
+ has_delta[idx] = TRUE;
+
+ outline->points[idx].x += FT_MulFix( deltas_x[j], apply );
+ outline->points[idx].y += FT_MulFix( deltas_y[j], apply );
+ }
+
+ /* no need to handle phantom points here, */
+ /* since solitary points can't be interpolated */
+ tt_handle_deltas( outline,
+ points_org,
+ has_delta );
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+ FT_TRACE7(( " point deltas:\n" ));
+
+ for ( j = 0; j < n_points; j++)
+ {
+ if ( ( points_org[j].x != outline->points[j].x ) ||
+ ( points_org[j].y != outline->points[j].y ) )
+ {
+ FT_TRACE7(( " %d: (%d, %d) -> (%d, %d)\n",
+ j,
+ points_org[j].x,
+ points_org[j].y,
+ outline->points[j].x,
+ outline->points[j].y ));
+ count++;
+ }
+ }
+
+ if ( !count )
+ FT_TRACE7(( " none\n" ));
+#endif
+ }
+
+ if ( localpoints != ALL_POINTS )
+ FT_FREE( localpoints );
+ FT_FREE( deltas_x );
+ FT_FREE( deltas_y );
+
+ offsetToData += tupleDataSize;
+
+ FT_Stream_SeekSet( stream, here );
+ }
+
+ FT_TRACE5(( "\n" ));
+
+ Fail2:
+ if ( sharedpoints != ALL_POINTS )
+ FT_FREE( sharedpoints );
+ FT_FREE( tuple_coords );
+ FT_FREE( im_start_coords );
+ FT_FREE( im_end_coords );
+
+ FT_FRAME_EXIT();
+
+ Fail1:
+ FT_FREE( points_org );
+ FT_FREE( has_delta );
+
+ return error;
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* tt_done_blend */
+ /* */
+ /* <Description> */
+ /* Free the blend internal data structure. */
+ /* */
+ FT_LOCAL_DEF( void )
+ tt_done_blend( FT_Memory memory,
+ GX_Blend blend )
+ {
+ if ( blend != NULL )
+ {
+ FT_UInt i;
+
+
+ FT_FREE( blend->normalizedcoords );
+ FT_FREE( blend->mmvar );
+
+ if ( blend->avar_segment != NULL )
+ {
+ for ( i = 0; i < blend->num_axis; i++ )
+ FT_FREE( blend->avar_segment[i].correspondence );
+ FT_FREE( blend->avar_segment );
+ }
+
+ FT_FREE( blend->tuplecoords );
+ FT_FREE( blend->glyphoffsets );
+ FT_FREE( blend );
+ }
+ }
+
+#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
+
+
+/* END */
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