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authormarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
committermarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
commit3562e78743202e43aec8727005182a2558117eca (patch)
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Checked in the following released items:
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Diffstat (limited to 'freetype/src/base/ftadvanc.c')
-rw-r--r--freetype/src/base/ftadvanc.c163
1 files changed, 163 insertions, 0 deletions
diff --git a/freetype/src/base/ftadvanc.c b/freetype/src/base/ftadvanc.c
new file mode 100644
index 000000000..504f9d230
--- /dev/null
+++ b/freetype/src/base/ftadvanc.c
@@ -0,0 +1,163 @@
+/***************************************************************************/
+/* */
+/* ftadvanc.c */
+/* */
+/* Quick computation of advance widths (body). */
+/* */
+/* Copyright 2008, 2009 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_ADVANCES_H
+#include FT_INTERNAL_OBJECTS_H
+
+
+ static FT_Error
+ _ft_face_scale_advances( FT_Face face,
+ FT_Fixed* advances,
+ FT_UInt count,
+ FT_Int32 flags )
+ {
+ FT_Fixed scale;
+ FT_UInt nn;
+
+
+ if ( flags & FT_LOAD_NO_SCALE )
+ return FT_Err_Ok;
+
+ if ( face->size == NULL )
+ return FT_Err_Invalid_Size_Handle;
+
+ if ( flags & FT_LOAD_VERTICAL_LAYOUT )
+ scale = face->size->metrics.y_scale;
+ else
+ scale = face->size->metrics.x_scale;
+
+ /* this must be the same scaling as to get linear{Hori,Vert}Advance */
+ /* (see `FT_Load_Glyph' implementation in src/base/ftobjs.c) */
+
+ for ( nn = 0; nn < count; nn++ )
+ advances[nn] = FT_MulDiv( advances[nn], scale, 64 );
+
+ return FT_Err_Ok;
+ }
+
+
+ /* at the moment, we can perform fast advance retrieval only in */
+ /* the following cases: */
+ /* */
+ /* - unscaled load */
+ /* - unhinted load */
+ /* - light-hinted load */
+
+#define LOAD_ADVANCE_FAST_CHECK( flags ) \
+ ( flags & ( FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING ) || \
+ FT_LOAD_TARGET_MODE( flags ) == FT_RENDER_MODE_LIGHT )
+
+
+ /* documentation is in ftadvanc.h */
+
+ FT_EXPORT_DEF( FT_Error )
+ FT_Get_Advance( FT_Face face,
+ FT_UInt gindex,
+ FT_Int32 flags,
+ FT_Fixed *padvance )
+ {
+ FT_Face_GetAdvancesFunc func;
+
+
+ if ( !face )
+ return FT_Err_Invalid_Face_Handle;
+
+ if ( gindex >= (FT_UInt)face->num_glyphs )
+ return FT_Err_Invalid_Glyph_Index;
+
+ func = face->driver->clazz->get_advances;
+ if ( func && LOAD_ADVANCE_FAST_CHECK( flags ) )
+ {
+ FT_Error error;
+
+
+ error = func( face, gindex, 1, flags, padvance );
+ if ( !error )
+ return _ft_face_scale_advances( face, padvance, 1, flags );
+
+ if ( error != FT_ERROR_BASE( FT_Err_Unimplemented_Feature ) )
+ return error;
+ }
+
+ return FT_Get_Advances( face, gindex, 1, flags, padvance );
+ }
+
+
+ /* documentation is in ftadvanc.h */
+
+ FT_EXPORT_DEF( FT_Error )
+ FT_Get_Advances( FT_Face face,
+ FT_UInt start,
+ FT_UInt count,
+ FT_Int32 flags,
+ FT_Fixed *padvances )
+ {
+ FT_Face_GetAdvancesFunc func;
+ FT_UInt num, end, nn;
+ FT_Error error = FT_Err_Ok;
+
+
+ if ( !face )
+ return FT_Err_Invalid_Face_Handle;
+
+ num = (FT_UInt)face->num_glyphs;
+ end = start + count;
+ if ( start >= num || end < start || end > num )
+ return FT_Err_Invalid_Glyph_Index;
+
+ if ( count == 0 )
+ return FT_Err_Ok;
+
+ func = face->driver->clazz->get_advances;
+ if ( func && LOAD_ADVANCE_FAST_CHECK( flags ) )
+ {
+ error = func( face, start, count, flags, padvances );
+ if ( !error )
+ goto Exit;
+
+ if ( error != FT_ERROR_BASE( FT_Err_Unimplemented_Feature ) )
+ return error;
+ }
+
+ error = FT_Err_Ok;
+
+ if ( flags & FT_ADVANCE_FLAG_FAST_ONLY )
+ return FT_Err_Unimplemented_Feature;
+
+ flags |= FT_LOAD_ADVANCE_ONLY;
+ for ( nn = 0; nn < count; nn++ )
+ {
+ error = FT_Load_Glyph( face, start + nn, flags );
+ if ( error )
+ break;
+
+ padvances[nn] = ( flags & FT_LOAD_VERTICAL_LAYOUT )
+ ? face->glyph->advance.y
+ : face->glyph->advance.x;
+ }
+
+ if ( error )
+ return error;
+
+ Exit:
+ return _ft_face_scale_advances( face, padvances, count, flags );
+ }
+
+
+/* END */