summaryrefslogtreecommitdiffstats
path: root/src/3rdparty/freetype/src/sdf/ftsdfcommon.h
diff options
context:
space:
mode:
Diffstat (limited to 'src/3rdparty/freetype/src/sdf/ftsdfcommon.h')
-rw-r--r--src/3rdparty/freetype/src/sdf/ftsdfcommon.h141
1 files changed, 141 insertions, 0 deletions
diff --git a/src/3rdparty/freetype/src/sdf/ftsdfcommon.h b/src/3rdparty/freetype/src/sdf/ftsdfcommon.h
new file mode 100644
index 0000000000..60ca9773e3
--- /dev/null
+++ b/src/3rdparty/freetype/src/sdf/ftsdfcommon.h
@@ -0,0 +1,141 @@
+/****************************************************************************
+ *
+ * ftsdfcommon.h
+ *
+ * Auxiliary data for Signed Distance Field support (specification).
+ *
+ * Copyright (C) 2020-2023 by
+ * David Turner, Robert Wilhelm, and Werner Lemberg.
+ *
+ * Written by Anuj Verma.
+ *
+ * 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.
+ *
+ */
+
+
+ /****************************************************
+ *
+ * This file contains common functions and properties
+ * for both the 'sdf' and 'bsdf' renderers.
+ *
+ */
+
+#ifndef FTSDFCOMMON_H_
+#define FTSDFCOMMON_H_
+
+#include <ft2build.h>
+#include FT_CONFIG_CONFIG_H
+#include <freetype/internal/ftobjs.h>
+
+
+FT_BEGIN_HEADER
+
+
+ /**************************************************************************
+ *
+ * default values (cannot be set individually for each renderer)
+ *
+ */
+
+ /* default spread value */
+#define DEFAULT_SPREAD 8
+ /* minimum spread supported by the renderer */
+#define MIN_SPREAD 2
+ /* maximum spread supported by the renderer */
+#define MAX_SPREAD 32
+ /* pixel size in 26.6 */
+#define ONE_PIXEL ( 1 << 6 )
+
+
+ /**************************************************************************
+ *
+ * common definitions (cannot be set individually for each renderer)
+ *
+ */
+
+ /* If this macro is set to 1 the rasterizer uses squared distances for */
+ /* computation. It can greatly improve the performance but there is a */
+ /* chance of overflow and artifacts. You can safely use it up to a */
+ /* pixel size of 128. */
+#ifndef USE_SQUARED_DISTANCES
+#define USE_SQUARED_DISTANCES 0
+#endif
+
+
+ /**************************************************************************
+ *
+ * common macros
+ *
+ */
+
+ /* convert int to 26.6 fixed-point */
+#define FT_INT_26D6( x ) ( x * 64 )
+ /* convert int to 16.16 fixed-point */
+#define FT_INT_16D16( x ) ( x * 65536 )
+ /* convert 26.6 to 16.16 fixed-point */
+#define FT_26D6_16D16( x ) ( x * 1024 )
+
+
+ /* Convenience macro to call a function; it */
+ /* jumps to label `Exit` if an error occurs. */
+#define FT_CALL( x ) do \
+ { \
+ error = ( x ); \
+ if ( error != FT_Err_Ok ) \
+ goto Exit; \
+ } while ( 0 )
+
+
+ /*
+ * The macro `VECTOR_LENGTH_16D16` computes either squared distances or
+ * actual distances, depending on the value of `USE_SQUARED_DISTANCES`.
+ *
+ * By using squared distances the performance can be greatly improved but
+ * there is a risk of overflow.
+ */
+#if USE_SQUARED_DISTANCES
+#define VECTOR_LENGTH_16D16( v ) ( FT_MulFix( v.x, v.x ) + \
+ FT_MulFix( v.y, v.y ) )
+#else
+#define VECTOR_LENGTH_16D16( v ) FT_Vector_Length( &v )
+#endif
+
+
+ /**************************************************************************
+ *
+ * common typedefs
+ *
+ */
+
+ typedef FT_Vector FT_26D6_Vec; /* with 26.6 fixed-point components */
+ typedef FT_Vector FT_16D16_Vec; /* with 16.16 fixed-point components */
+
+ typedef FT_Int32 FT_16D16; /* 16.16 fixed-point representation */
+ typedef FT_Int32 FT_26D6; /* 26.6 fixed-point representation */
+ typedef FT_Byte FT_SDFFormat; /* format to represent SDF data */
+
+ typedef FT_BBox FT_CBox; /* control box of a curve */
+
+
+ FT_LOCAL( FT_16D16 )
+ square_root( FT_16D16 val );
+
+ FT_LOCAL( FT_SDFFormat )
+ map_fixed_to_sdf( FT_16D16 dist,
+ FT_16D16 max_value );
+
+ FT_LOCAL( FT_SDFFormat )
+ invert_sign( FT_SDFFormat dist );
+
+
+FT_END_HEADER
+
+#endif /* FTSDFCOMMON_H_ */
+
+
+/* END */