128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
#include <ft2build.h>
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#include FT_ADVANCES_H
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#include FT_INTERNAL_OBJECTS_H
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static FT_Error
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_ft_face_scale_advances( FT_Face face,
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FT_Fixed* advances,
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FT_UInt count,
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FT_UInt flags )
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{
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FT_Fixed scale;
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FT_UInt nn;
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if ( (flags & FT_LOAD_NO_SCALE) )
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return FT_Err_Ok;
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if ( face->size == NULL )
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return FT_Err_Invalid_Size_Handle;
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if ( !(flags & FT_LOAD_VERTICAL_LAYOUT) )
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scale = face->size->metrics.x_scale;
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else
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scale = face->size->metrics.y_scale;
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/* this must be the same computation than to get linearHori/VertAdvance
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* (see FT_Load_Glyph() implementation in src/base/ftobjs.c */
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for (nn = 0; nn < count; nn++)
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advances[nn] = FT_MulDiv( advances[nn], scale, 64 );
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return 0;
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}
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/* at the moment, we can perform fast advance retrieval only in
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the following cases:
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- unscaled load
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- unhinted load
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- light-hinted load
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*/
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#define LOAD_ADVANCE_FAST_CHECK(flags) \
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(((flags & (FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING)) != 0) || \
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FT_LOAD_TARGET_MODE(flags) == FT_RENDER_MODE_LIGHT)
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FT_EXPORT_DEF(FT_Error)
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FT_Get_Advance( FT_Face face,
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FT_UInt gindex,
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FT_UInt flags,
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FT_Fixed *padvance )
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{
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FT_Face_GetAdvancesFunc func;
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if ( !face )
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return FT_Err_Invalid_Face_Handle;
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if (gindex >= (FT_UInt) face->num_glyphs )
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return FT_Err_Invalid_Glyph_Index;
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func = face->driver->clazz->get_advances;
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if (func != NULL && LOAD_ADVANCE_FAST_CHECK(flags))
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{
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FT_Error error;
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error = func( face, gindex, 1, flags, padvance );
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if (!error)
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return _ft_face_scale_advances( face, padvance, 1, flags );
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if (error != FT_Err_Unimplemented_Feature)
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return error;
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}
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return FT_Get_Advances( face, gindex, 1, flags, padvance );
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}
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FT_EXPORT_DEF(FT_Error)
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FT_Get_Advances( FT_Face face,
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FT_UInt start,
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FT_UInt count,
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FT_UInt flags,
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FT_Fixed *padvances )
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{
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FT_Face_GetAdvancesFunc func;
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FT_UInt num, end, nn;
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FT_Error error = 0;
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if ( !face )
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return FT_Err_Invalid_Face_Handle;
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num = (FT_UInt) face->num_glyphs;
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end = start + count;
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if (start >= num || end < start || end > num)
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return FT_Err_Invalid_Glyph_Index;
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if (count == 0)
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return FT_Err_Ok;
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func = face->driver->clazz->get_advances;
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if (func != NULL && LOAD_ADVANCE_FAST_CHECK(flags))
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{
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error = func( face, start, count, flags, padvances );
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if (!error) goto Exit;
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if (error != FT_Err_Unimplemented_Feature)
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return error;
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}
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error = 0;
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if ((flags & FT_ADVANCE_FLAG_FAST_ONLY) != 0)
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return FT_Err_Unimplemented_Feature;
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flags |= FT_LOAD_ADVANCE_ONLY;
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for (nn = 0; nn < count; nn++)
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{
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error = FT_Load_Glyph( face, start+nn, flags );
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if (error) break;
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padvances[nn] = (flags & FT_LOAD_VERTICAL_LAYOUT)
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? face->glyph->advance.x
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: face->glyph->advance.y;
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}
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if (error) return error;
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Exit:
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return _ft_face_scale_advances( face, padvances, count, flags );
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}
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