20060303a

1 files changed, 437 insertions, 0 deletions

diff --git a/libfreetype/cidgload.c b/libfreetype/cidgload.c
new file mode 100644
index 00000000..9e606742
--- /dev/null
+++ b/libfreetype/cidgload.c
@@ -0,0 +1,437 @@
+/***************************************************************************/
+/*                                                                         */
+/*  cidgload.c                                                             */
+/*                                                                         */
+/*    CID-keyed Type1 Glyph Loader (body).                                 */
+/*                                                                         */
+/*  Copyright 1996-2001, 2002 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 "cidload.h"
+#include "cidgload.h"
+#include FT_INTERNAL_DEBUG_H
+#include FT_INTERNAL_STREAM_H
+#include FT_OUTLINE_H
+
+#include "ciderrs.h"
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* 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_cidgload
+
+
+  FT_CALLBACK_DEF( FT_Error )
+  cid_load_glyph( T1_Decoder  decoder,
+                  FT_UInt     glyph_index )
+  {
+    CID_Face      face = (CID_Face)decoder->builder.face;
+    CID_FaceInfo  cid  = &face->cid;
+    FT_Byte*      p;
+    FT_UInt       fd_select;
+    FT_Stream     stream = face->root.stream;
+    FT_Error      error  = 0;
+    FT_Byte*      charstring = 0;
+    FT_Memory     memory = face->root.memory;
+    FT_UInt       glyph_length = 0;
+
+
+#ifdef FT_CONFIG_OPTION_INCREMENTAL
+
+    /* For incremental fonts get the character data using */
+    /* the callback function.                             */
+    if ( face->root.internal->incremental_interface )
+    {
+      FT_Data  glyph_data;
+
+
+      error = face->root.internal->incremental_interface->funcs->get_glyph_data(
+                face->root.internal->incremental_interface->object,
+                glyph_index,
+                &glyph_data );
+      if ( error )
+        goto Exit;
+
+      p         = (FT_Byte*)glyph_data.pointer;
+      fd_select = (FT_UInt)cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
+
+      if ( glyph_data.length != 0 )
+      {
+        glyph_length = glyph_data.length - cid->fd_bytes;
+        FT_ALLOC( charstring, glyph_length );
+        if ( !error )
+          ft_memcpy( charstring, glyph_data.pointer + cid->fd_bytes,
+                     glyph_length );
+      }
+
+      face->root.internal->incremental_interface->funcs->free_glyph_data(
+                face->root.internal->incremental_interface->object,
+                &glyph_data );
+
+      if ( error )
+        goto Exit;
+    }
+
+    else
+
+#endif
+
+    /* For ordinary fonts read the CID font dictionary index */
+    /* and charstring offset from the CIDMap.                */
+    {
+      FT_UInt   entry_len = cid->fd_bytes + cid->gd_bytes;
+      FT_ULong  off1;
+
+
+      if ( FT_STREAM_SEEK( cid->data_offset + cid->cidmap_offset +
+                           glyph_index * entry_len )               ||
+           FT_FRAME_ENTER( 2 * entry_len )                         )
+        goto Exit;
+
+      p            = (FT_Byte*)stream->cursor;
+      fd_select    = (FT_UInt) cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
+      off1         = (FT_ULong)cid_get_offset( &p, (FT_Byte)cid->gd_bytes );
+      p           += cid->fd_bytes;
+      glyph_length = (FT_UInt) cid_get_offset(
+                                 &p, (FT_Byte)cid->gd_bytes ) - off1;
+      FT_FRAME_EXIT();
+
+      if ( glyph_length == 0 )
+        goto Exit;
+      if ( FT_ALLOC( charstring, glyph_length ) )
+        goto Exit;
+      if ( FT_STREAM_READ_AT( cid->data_offset + off1,
+                              charstring, glyph_length ) )
+        goto Exit;
+    }
+
+    /* Now set up the subrs array and parse the charstrings. */
+    {
+      CID_FaceDict  dict;
+      CID_Subrs     cid_subrs = face->subrs + fd_select;
+      FT_Int        cs_offset;
+
+
+      /* Set up subrs */
+      decoder->num_subrs = cid_subrs->num_subrs;
+      decoder->subrs     = cid_subrs->code;
+      decoder->subrs_len = 0;
+
+      /* Set up font matrix */
+      dict                 = cid->font_dicts + fd_select;
+
+      decoder->font_matrix = dict->font_matrix;
+      decoder->font_offset = dict->font_offset;
+      decoder->lenIV       = dict->private_dict.lenIV;
+
+      /* Decode the charstring. */
+
+      /* Adjustment for seed bytes. */
+      cs_offset = ( decoder->lenIV >= 0 ? decoder->lenIV : 0 );
+
+      /* Decrypt only if lenIV >= 0. */
+      if ( decoder->lenIV >= 0 )
+        cid_decrypt( charstring, glyph_length, 4330 );
+
+      error = decoder->funcs.parse_charstrings( decoder,
+                                                charstring + cs_offset,
+                                                glyph_length - cs_offset  );
+    }
+
+    FT_FREE( charstring );
+
+#ifdef FT_CONFIG_OPTION_INCREMENTAL
+
+    /* Incremental fonts can optionally override the metrics. */
+    if ( !error                                       &&
+         face->root.internal->incremental_interface   &&
+         face->root.internal->incremental_interface->funcs->get_glyph_metrics )
+    {
+      FT_Bool                    found = FALSE;
+      FT_Incremental_MetricsRec  metrics;
+
+
+      error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
+                face->root.internal->incremental_interface->object,
+                glyph_index, FALSE, &metrics, &found );
+      if ( found )
+      {
+        decoder->builder.left_bearing.x = metrics.bearing_x;
+        decoder->builder.left_bearing.y = metrics.bearing_y;
+        decoder->builder.advance.x      = metrics.advance;
+        decoder->builder.advance.y      = 0;
+      }
+    }
+
+#endif
+
+  Exit:
+    return error;
+  }
+
+
+#if 0
+
+
+  /*************************************************************************/
+  /*************************************************************************/
+  /*************************************************************************/
+  /**********                                                      *********/
+  /**********                                                      *********/
+  /**********            COMPUTE THE MAXIMUM ADVANCE WIDTH         *********/
+  /**********                                                      *********/
+  /**********    The following code is in charge of computing      *********/
+  /**********    the maximum advance width of the font.  It        *********/
+  /**********    quickly processes each glyph charstring to        *********/
+  /**********    extract the value from either a `sbw' or `seac'   *********/
+  /**********    operator.                                         *********/
+  /**********                                                      *********/
+  /*************************************************************************/
+  /*************************************************************************/
+  /*************************************************************************/
+
+
+  FT_LOCAL_DEF( FT_Error )
+  cid_face_compute_max_advance( CID_Face  face,
+                                FT_Int*   max_advance )
+  {
+    FT_Error       error;
+    T1_DecoderRec  decoder;
+    FT_Int         glyph_index;
+
+    PSAux_Service  psaux = (PSAux_Service)face->psaux;
+
+
+    *max_advance = 0;
+
+    /* Initialize load decoder */
+    error = psaux->t1_decoder_funcs->init( &decoder,
+                                           (FT_Face)face,
+                                           0, /* size       */
+                                           0, /* glyph slot */
+                                           0, /* glyph names! XXX */
+                                           0, /* blend == 0 */
+                                           0, /* hinting == 0 */
+                                           cid_load_glyph );
+    if ( error )
+      return error;
+
+    decoder.builder.metrics_only = 1;
+    decoder.builder.load_points  = 0;
+
+    /* for each glyph, parse the glyph charstring and extract */
+    /* the advance width                                      */
+    for ( glyph_index = 0; glyph_index < face->root.num_glyphs;
+          glyph_index++ )
+    {
+      /* now get load the unscaled outline */
+      error = cid_load_glyph( &decoder, glyph_index );
+      /* ignore the error if one occurred - skip to next glyph */
+    }
+
+    *max_advance = decoder.builder.advance.x;
+
+    return CID_Err_Ok;
+  }
+
+
+#endif /* 0 */
+
+
+  /*************************************************************************/
+  /*************************************************************************/
+  /*************************************************************************/
+  /**********                                                      *********/
+  /**********                                                      *********/
+  /**********               UNHINTED GLYPH LOADER                  *********/
+  /**********                                                      *********/
+  /**********    The following code is in charge of loading a      *********/
+  /**********    single outline.  It completely ignores hinting    *********/
+  /**********    and is used when FT_LOAD_NO_HINTING is set.       *********/
+  /**********                                                      *********/
+  /*************************************************************************/
+  /*************************************************************************/
+  /*************************************************************************/
+
+
+  FT_LOCAL_DEF( FT_Error )
+  cid_slot_load_glyph( CID_GlyphSlot  glyph,
+                       CID_Size       size,
+                       FT_Int         glyph_index,
+                       FT_Int32       load_flags )
+  {
+    FT_Error       error;
+    T1_DecoderRec  decoder;
+    CID_Face       face = (CID_Face)glyph->root.face;
+    FT_Bool        hinting;
+
+    PSAux_Service  psaux = (PSAux_Service)face->psaux;
+    FT_Matrix      font_matrix;
+    FT_Vector      font_offset;
+
+
+    if ( load_flags & FT_LOAD_NO_RECURSE )
+      load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
+
+    glyph->x_scale = size->root.metrics.x_scale;
+    glyph->y_scale = size->root.metrics.y_scale;
+
+    glyph->root.outline.n_points   = 0;
+    glyph->root.outline.n_contours = 0;
+
+    hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE   ) == 0 &&
+                       ( load_flags & FT_LOAD_NO_HINTING ) == 0 );
+
+    glyph->root.format = FT_GLYPH_FORMAT_OUTLINE;
+
+    {
+      error = psaux->t1_decoder_funcs->init( &decoder,
+                                             (FT_Face)face,
+                                             (FT_Size)size,
+                                             (FT_GlyphSlot)glyph,
+                                             0, /* glyph names -- XXX */
+                                             0, /* blend == 0 */
+                                             hinting,
+                                             FT_LOAD_TARGET_MODE(load_flags),
+                                             cid_load_glyph );
+
+      /* set up the decoder */
+      decoder.builder.no_recurse = FT_BOOL(
+        ( ( load_flags & FT_LOAD_NO_RECURSE ) != 0 ) );
+
+      error = cid_load_glyph( &decoder, glyph_index );
+
+      font_matrix = decoder.font_matrix;
+      font_offset = decoder.font_offset;
+
+      /* save new glyph tables */
+      psaux->t1_decoder_funcs->done( &decoder );
+    }
+
+    /* now, set the metrics -- this is rather simple, as   */
+    /* the left side bearing is the xMin, and the top side */
+    /* bearing the yMax                                    */
+    if ( !error )
+    {
+      glyph->root.outline.flags &= FT_OUTLINE_OWNER;
+      glyph->root.outline.flags |= FT_OUTLINE_REVERSE_FILL;
+
+      /* for composite glyphs, return only left side bearing and */
+      /* advance width                                           */
+      if ( load_flags & FT_LOAD_NO_RECURSE )
+      {
+        FT_Slot_Internal  internal = glyph->root.internal;
+
+
+        glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
+        glyph->root.metrics.horiAdvance  = decoder.builder.advance.x;
+
+        internal->glyph_matrix         = font_matrix;
+        internal->glyph_delta          = font_offset;
+        internal->glyph_transformed    = 1;
+      }
+      else
+      {
+        FT_BBox            cbox;
+        FT_Glyph_Metrics*  metrics = &glyph->root.metrics;
+
+
+        /* copy the _unscaled_ advance width */
+        metrics->horiAdvance          = decoder.builder.advance.x;
+        glyph->root.linearHoriAdvance = decoder.builder.advance.x;
+        glyph->root.internal->glyph_transformed = 0;
+
+        /* make up vertical metrics */
+        metrics->vertBearingX = 0;
+        metrics->vertBearingY = 0;
+        metrics->vertAdvance  = 0;
+
+        glyph->root.linearVertAdvance = 0;
+        glyph->root.format = FT_GLYPH_FORMAT_OUTLINE;
+
+        if ( size && size->root.metrics.y_ppem < 24 )
+          glyph->root.outline.flags |= FT_OUTLINE_HIGH_PRECISION;
+
+        /* apply the font matrix */
+        FT_Outline_Transform( &glyph->root.outline, &font_matrix );
+
+        FT_Outline_Translate( &glyph->root.outline,
+                              font_offset.x,
+                              font_offset.y );
+
+        if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
+        {
+          /* scale the outline and the metrics */
+          FT_Int       n;
+          FT_Outline*  cur = decoder.builder.base;
+          FT_Vector*   vec = cur->points;
+          FT_Fixed     x_scale = glyph->x_scale;
+          FT_Fixed     y_scale = glyph->y_scale;
+
+
+          /* First of all, scale the points */
+          if ( !hinting )
+            for ( n = cur->n_points; n > 0; n--, vec++ )
+            {
+              vec->x = FT_MulFix( vec->x, x_scale );
+              vec->y = FT_MulFix( vec->y, y_scale );
+            }
+
+          FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
+
+          /* Then scale the metrics */
+          metrics->horiAdvance  = FT_MulFix( metrics->horiAdvance,  x_scale );
+          metrics->vertAdvance  = FT_MulFix( metrics->vertAdvance,  y_scale );
+
+          metrics->vertBearingX = FT_MulFix( metrics->vertBearingX, x_scale );
+          metrics->vertBearingY = FT_MulFix( metrics->vertBearingY, y_scale );
+
+          if ( hinting )
+          {
+            metrics->horiAdvance = ( metrics->horiAdvance + 32 ) & -64;
+            metrics->vertAdvance = ( metrics->vertAdvance + 32 ) & -64;
+
+            metrics->vertBearingX = ( metrics->vertBearingX + 32 ) & -64;
+            metrics->vertBearingY = ( metrics->vertBearingY + 32 ) & -64;
+          }
+        }
+
+        /* compute the other metrics */
+        FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
+
+        /* grid fit the bounding box if necessary */
+        if ( hinting )
+        {
+          cbox.xMin &= -64;
+          cbox.yMin &= -64;
+          cbox.xMax  = ( cbox.xMax + 63 ) & -64;
+          cbox.yMax  = ( cbox.yMax + 63 ) & -64;
+        }
+
+        metrics->width  = cbox.xMax - cbox.xMin;
+        metrics->height = cbox.yMax - cbox.yMin;
+
+        metrics->horiBearingX = cbox.xMin;
+        metrics->horiBearingY = cbox.yMax;
+      }
+    }
+    return error;
+  }
+
+
+/* END */