Update freetype to latest version of ASOP.

src/cache/ftcsbits.c

Index: src/cache/ftcsbits.c
diff --git a/src/cache/ftcsbits.c b/src/cache/ftcsbits.c
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+/***************************************************************************/
+/*                                                                         */
+/*  ftcsbits.c                                                             */
+/*                                                                         */
+/*    FreeType sbits manager (body).                                       */
+/*                                                                         */
+/*  Copyright 2000-2006, 2009-2011, 2013 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 FT_CACHE_H
+#include "ftcsbits.h"
+#include FT_INTERNAL_OBJECTS_H
+#include FT_INTERNAL_DEBUG_H
+#include FT_ERRORS_H
+
+#include "ftccback.h"
+#include "ftcerror.h"
+
+#undef  FT_COMPONENT
+#define FT_COMPONENT  trace_cache
+
+
+  /*************************************************************************/
+  /*************************************************************************/
+  /*****                                                               *****/
+  /*****                     SBIT CACHE NODES                          *****/
+  /*****                                                               *****/
+  /*************************************************************************/
+  /*************************************************************************/
+
+
+  static FT_Error
+  ftc_sbit_copy_bitmap( FTC_SBit    sbit,
+                        FT_Bitmap*  bitmap,
+                        FT_Memory   memory )
+  {
+    FT_Error  error;
+    FT_Int    pitch = bitmap->pitch;
+    FT_ULong  size;
+
+
+    if ( pitch < 0 )
+      pitch = -pitch;
+
+    size = (FT_ULong)( pitch * bitmap->rows );
+
+    if ( !FT_ALLOC( sbit->buffer, size ) )
+      FT_MEM_COPY( sbit->buffer, bitmap->buffer, size );
+
+    return error;
+  }
+
+
+  FT_LOCAL_DEF( void )
+  ftc_snode_free( FTC_Node   ftcsnode,
+                  FTC_Cache  cache )
+  {
+    FTC_SNode  snode  = (FTC_SNode)ftcsnode;
+    FTC_SBit   sbit   = snode->sbits;
+    FT_UInt    count  = snode->count;
+    FT_Memory  memory = cache->memory;
+
+
+    for ( ; count > 0; sbit++, count-- )
+      FT_FREE( sbit->buffer );
+
+    FTC_GNode_Done( FTC_GNODE( snode ), cache );
+
+    FT_FREE( snode );
+  }
+
+
+  FT_LOCAL_DEF( void )
+  FTC_SNode_Free( FTC_SNode  snode,
+                  FTC_Cache  cache )
+  {
+    ftc_snode_free( FTC_NODE( snode ), cache );
+  }
+
+
+  /*
+   *  This function tries to load a small bitmap within a given FTC_SNode.
+   *  Note that it returns a non-zero error code _only_ in the case of
+   *  out-of-memory condition.  For all other errors (e.g., corresponding
+   *  to a bad font file), this function will mark the sbit as `unavailable'
+   *  and return a value of 0.
+   *
+   *  You should also read the comment within the @ftc_snode_compare
+   *  function below to see how out-of-memory is handled during a lookup.
+   */
+  static FT_Error
+  ftc_snode_load( FTC_SNode    snode,
+                  FTC_Manager  manager,
+                  FT_UInt      gindex,
+                  FT_ULong    *asize )
+  {
+    FT_Error          error;
+    FTC_GNode         gnode  = FTC_GNODE( snode );
+    FTC_Family        family = gnode->family;
+    FT_Memory         memory = manager->memory;
+    FT_Face           face;
+    FTC_SBit          sbit;
+    FTC_SFamilyClass  clazz;
+
+
+    if ( (FT_UInt)(gindex - gnode->gindex) >= snode->count )
+    {
+      FT_ERROR(( "ftc_snode_load: invalid glyph index" ));
+      return FT_THROW( Invalid_Argument );
+    }
+
+    sbit  = snode->sbits + ( gindex - gnode->gindex );
+    clazz = (FTC_SFamilyClass)family->clazz;
+
+    sbit->buffer = 0;
+
+    error = clazz->family_load_glyph( family, gindex, manager, &face );
+    if ( error )
+      goto BadGlyph;
+
+    {
+      FT_Int        temp;
+      FT_GlyphSlot  slot   = face->glyph;
+      FT_Bitmap*    bitmap = &slot->bitmap;
+      FT_Pos        xadvance, yadvance; /* FT_GlyphSlot->advance.{x|y} */
+
+
+      if ( slot->format != FT_GLYPH_FORMAT_BITMAP )
+      {
+        FT_TRACE0(( "ftc_snode_load:"
+                    " glyph loaded didn't return a bitmap\n" ));
+        goto BadGlyph;
+      }
+
+      /* Check that our values fit into 8-bit containers!       */
+      /* If this is not the case, our bitmap is too large       */
+      /* and we will leave it as `missing' with sbit.buffer = 0 */
+
+#define CHECK_CHAR( d )  ( temp = (FT_Char)d, temp == d )
+#define CHECK_BYTE( d )  ( temp = (FT_Byte)d, temp == d )
+
+      /* horizontal advance in pixels */
+      xadvance = ( slot->advance.x + 32 ) >> 6;
+      yadvance = ( slot->advance.y + 32 ) >> 6;
+
+      if ( !CHECK_BYTE( bitmap->rows  )     ||
+           !CHECK_BYTE( bitmap->width )     ||
+           !CHECK_CHAR( bitmap->pitch )     ||
+           !CHECK_CHAR( slot->bitmap_left ) ||
+           !CHECK_CHAR( slot->bitmap_top  ) ||
+           !CHECK_CHAR( xadvance )          ||
+           !CHECK_CHAR( yadvance )          )
+      {
+        FT_TRACE2(( "ftc_snode_load:"
+                    " glyph too large for small bitmap cache\n"));
+        goto BadGlyph;
+      }
+
+      sbit->width     = (FT_Byte)bitmap->width;
+      sbit->height    = (FT_Byte)bitmap->rows;
+      sbit->pitch     = (FT_Char)bitmap->pitch;
+      sbit->left      = (FT_Char)slot->bitmap_left;
+      sbit->top       = (FT_Char)slot->bitmap_top;
+      sbit->xadvance  = (FT_Char)xadvance;
+      sbit->yadvance  = (FT_Char)yadvance;
+      sbit->format    = (FT_Byte)bitmap->pixel_mode;
+      sbit->max_grays = (FT_Byte)(bitmap->num_grays - 1);
+
+      /* copy the bitmap into a new buffer -- ignore error */
+      error = ftc_sbit_copy_bitmap( sbit, bitmap, memory );
+
+      /* now, compute size */
+      if ( asize )
+        *asize = FT_ABS( sbit->pitch ) * sbit->height;
+
+    } /* glyph loading successful */
+
+    /* ignore the errors that might have occurred --   */
+    /* we mark unloaded glyphs with `sbit.buffer == 0' */
+    /* and `width == 255', `height == 0'               */
+    /*                                                 */
+    if ( error && FT_ERR_NEQ( error, Out_Of_Memory ) )
+    {
+    BadGlyph:
+      sbit->width  = 255;
+      sbit->height = 0;
+      sbit->buffer = NULL;
+      error        = FT_Err_Ok;
+      if ( asize )
+        *asize = 0;
+    }
+
+    return error;
+  }
+
+
+  FT_LOCAL_DEF( FT_Error )
+  FTC_SNode_New( FTC_SNode  *psnode,
+                 FTC_GQuery  gquery,
+                 FTC_Cache   cache )
+  {
+    FT_Memory   memory = cache->memory;
+    FT_Error    error;
+    FTC_SNode   snode  = NULL;
+    FT_UInt     gindex = gquery->gindex;
+    FTC_Family  family = gquery->family;
+
+    FTC_SFamilyClass  clazz = FTC_CACHE__SFAMILY_CLASS( cache );
+    FT_UInt           total;
+    FT_UInt           node_count;
+
+
+    total = clazz->family_get_count( family, cache->manager );
+    if ( total == 0 || gindex >= total )
+    {
+      error = FT_THROW( Invalid_Argument );
+      goto Exit;
+    }
+
+    if ( !FT_NEW( snode ) )
+    {
+      FT_UInt  count, start;
+
+
+      start = gindex - ( gindex % FTC_SBIT_ITEMS_PER_NODE );
+      count = total - start;
+      if ( count > FTC_SBIT_ITEMS_PER_NODE )
+        count = FTC_SBIT_ITEMS_PER_NODE;
+
+      FTC_GNode_Init( FTC_GNODE( snode ), start, family );
+
+      snode->count = count;
+      for ( node_count = 0; node_count < count; node_count++ )
+      {
+        snode->sbits[node_count].width = 255;
+      }
+
+      error = ftc_snode_load( snode,
+                              cache->manager,
+                              gindex,
+                              NULL );
+      if ( error )
+      {
+        FTC_SNode_Free( snode, cache );
+        snode = NULL;
+      }
+    }
+
+  Exit:
+    *psnode = snode;
+    return error;
+  }
+
+
+  FT_LOCAL_DEF( FT_Error )
+  ftc_snode_new( FTC_Node   *ftcpsnode,
+                 FT_Pointer  ftcgquery,
+                 FTC_Cache   cache )
+  {
+    FTC_SNode  *psnode = (FTC_SNode*)ftcpsnode;
+    FTC_GQuery  gquery = (FTC_GQuery)ftcgquery;
+
+
+    return FTC_SNode_New( psnode, gquery, cache );
+  }
+
+
+  FT_LOCAL_DEF( FT_Offset )
+  ftc_snode_weight( FTC_Node   ftcsnode,
+                    FTC_Cache  cache )
+  {
+    FTC_SNode  snode = (FTC_SNode)ftcsnode;
+    FT_UInt    count = snode->count;
+    FTC_SBit   sbit  = snode->sbits;
+    FT_Int     pitch;
+    FT_Offset  size;
+
+    FT_UNUSED( cache );
+
+
+    FT_ASSERT( snode->count <= FTC_SBIT_ITEMS_PER_NODE );
+
+    /* the node itself */
+    size = sizeof ( *snode );
+
+    for ( ; count > 0; count--, sbit++ )
+    {
+      if ( sbit->buffer )
+      {
+        pitch = sbit->pitch;
+        if ( pitch < 0 )
+          pitch = -pitch;
+
+        /* add the size of a given glyph image */
+        size += pitch * sbit->height;
+      }
+    }
+
+    return size;
+  }
+
+
+#if 0
+
+  FT_LOCAL_DEF( FT_Offset )
+  FTC_SNode_Weight( FTC_SNode  snode )
+  {
+    return ftc_snode_weight( FTC_NODE( snode ), NULL );
+  }
+
+#endif /* 0 */
+
+
+  FT_LOCAL_DEF( FT_Bool )
+  ftc_snode_compare( FTC_Node    ftcsnode,
+                     FT_Pointer  ftcgquery,
+                     FTC_Cache   cache,
+                     FT_Bool*    list_changed )
+  {
+    FTC_SNode   snode  = (FTC_SNode)ftcsnode;
+    FTC_GQuery  gquery = (FTC_GQuery)ftcgquery;
+    FTC_GNode   gnode  = FTC_GNODE( snode );
+    FT_UInt     gindex = gquery->gindex;
+    FT_Bool     result;
+
+
+    if (list_changed)
+      *list_changed = FALSE;
+    result = FT_BOOL( gnode->family == gquery->family                    &&
+                      (FT_UInt)( gindex - gnode->gindex ) < snode->count );
+    if ( result )
+    {
+      /* check if we need to load the glyph bitmap now */
+      FTC_SBit  sbit = snode->sbits + ( gindex - gnode->gindex );
+
+
+      /*
+       *  The following code illustrates what to do when you want to
+       *  perform operations that may fail within a lookup function.
+       *
+       *  Here, we want to load a small bitmap on-demand; we thus
+       *  need to call the `ftc_snode_load' function which may return
+       *  a non-zero error code only when we are out of memory (OOM).
+       *
+       *  The correct thing to do is to use @FTC_CACHE_TRYLOOP and
+       *  @FTC_CACHE_TRYLOOP_END in order to implement a retry loop
+       *  that is capable of flushing the cache incrementally when
+       *  an OOM errors occur.
+       *
+       *  However, we need to `lock' the node before this operation to
+       *  prevent it from being flushed within the loop.
+       *
+       *  When we exit the loop, we unlock the node, then check the `error'
+       *  variable.  If it is non-zero, this means that the cache was
+       *  completely flushed and that no usable memory was found to load
+       *  the bitmap.
+       *
+       *  We then prefer to return a value of 0 (i.e., NO MATCH).  This
+       *  ensures that the caller will try to allocate a new node.
+       *  This operation consequently _fail_ and the lookup function
+       *  returns the appropriate OOM error code.
+       *
+       *  Note that `buffer == NULL && width == 255' is a hack used to
+       *  tag `unavailable' bitmaps in the array.  We should never try
+       *  to load these.
+       *
+       */
+
+      if ( sbit->buffer == NULL && sbit->width == 255 )
+      {
+        FT_ULong  size;
+        FT_Error  error;
+
+
+        ftcsnode->ref_count++;  /* lock node to prevent flushing */
+                                /* in retry loop                 */
+
+        FTC_CACHE_TRYLOOP( cache )
+        {
+          error = ftc_snode_load( snode, cache->manager, gindex, &size );
+        }
+        FTC_CACHE_TRYLOOP_END( list_changed );
+
+        ftcsnode->ref_count--;  /* unlock the node */
+
+        if ( error )
+          result = 0;
+        else
+          cache->manager->cur_weight += size;
+      }
+    }
+
+    return result;
+  }
+
+
+#ifdef FTC_INLINE
+
+  FT_LOCAL_DEF( FT_Bool )
+  FTC_SNode_Compare( FTC_SNode   snode,
+                     FTC_GQuery  gquery,
+                     FTC_Cache   cache,
+                     FT_Bool*    list_changed )
+  {
+    return ftc_snode_compare( FTC_NODE( snode ), gquery,
+                              cache, list_changed );
+  }
+
+#endif
+
+/* END */