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[inkscape.git] / src / display / nr-filter-turbulence.h

diff --git a/src/display/nr-filter-turbulence.h b/src/display/nr-filter-turbulence.h
index 8f7849f884264ac7381b35b33f541f1bc78a6eef..b12e6395a1122878554feaa775cb92ec790689c3 100644 (file)
--- a/src/display/nr-filter-turbulence.h
+++ b/src/display/nr-filter-turbulence.h
@@ -5,18 +5,29 @@
  * feTurbulence filter primitive renderer
  *
  * Authors:
- *   Felipe Sanches <felipe.sanches@gmail.com>
+ *   World Wide Web Consortium <http://www.w3.org/>
+ *   Felipe Corrêa da Silva Sanches <felipe.sanches@gmail.com>
  *   Niko Kiirala <niko@kiirala.com>
  *
- * Copyright (C) 2007 authors
+ * This file has a considerable amount of code adapted from
+ *  the W3C SVG filter specs, available at:
+ *  http://www.w3.org/TR/SVG11/filters.html#feTurbulence
+ *
+ * W3C original code is licensed under the terms of
+ *  the (GPL compatible) W3C® SOFTWARE NOTICE AND LICENSE:
+ *  http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
  *
+ * Copyright (C) 2007 authors
  * Released under GNU GPL, read the file 'COPYING' for more information
  */
 
 #include "display/nr-filter-primitive.h"
 #include "display/nr-filter-slot.h"
+#include "display/nr-filter-units.h"
+#include "libnr/nr-rect-l.h"
 
-namespace NR {
+namespace Inkscape {
+namespace Filters {
 
 enum FilterTurbulenceType {
     TURBULENCE_FRACTALNOISE,
@@ -24,27 +35,80 @@ enum FilterTurbulenceType {
     TURBULENCE_ENDTYPE
 };
 
+struct StitchInfo
+{
+  int nWidth; // How much to subtract to wrap for stitching.
+  int nHeight;
+  int nWrapX; // Minimum value to wrap.
+  int nWrapY;
+};
+
+/* Produces results in the range [1, 2**31 - 2].
+Algorithm is: r = (a * r) mod m
+where a = 16807 and m = 2**31 - 1 = 2147483647
+See [Park & Miller], CACM vol. 31 no. 10 p. 1195, Oct. 1988
+To test: the algorithm should produce the result 1043618065
+as the 10,000th generated number if the original seed is 1.
+*/
+#define RAND_m 2147483647 /* 2**31 - 1 */
+#define RAND_a 16807 /* 7**5; primitive root of m */
+#define RAND_q 127773 /* m / a */
+#define RAND_r 2836 /* m % a */
+#define BSize 0x100
+#define BM 0xff
+#define PerlinN 0x1000
+#define NP 12 /* 2^PerlinN */
+#define NM 0xfff
+#define s_curve(t) ( t * t * (3. - 2. * t) )
+#define turb_lerp(t, a, b) ( a + t * (b - a) )
+
 class FilterTurbulence : public FilterPrimitive {
 public:
     FilterTurbulence();
     static FilterPrimitive *create();
     virtual ~FilterTurbulence();
 
-    virtual int render(FilterSlot &slot, Matrix const &trans);
-    virtual void set_baseFrequency(int axis, double freq);
-    virtual void set_numOctaves(int num);
-    virtual void set_seed(double s);
-    virtual void set_stitchTiles(bool st);
-    virtual void set_type(FilterTurbulenceType t);
+    virtual int render(FilterSlot &slot, FilterUnits const &units);
+    void update_pixbuffer(NR::IRect &area, FilterUnits const &units);
+    void render_area(NRPixBlock *pix, NR::IRect &full_area, FilterUnits const &units);
+
+    void set_baseFrequency(int axis, double freq);
+    void set_numOctaves(int num);
+    void set_seed(double s);
+    void set_stitchTiles(bool st);
+    void set_type(FilterTurbulenceType t);
+    void set_updated(bool u);
+    virtual FilterTraits get_input_traits();
 private:
+
+    long Turbulence_setup_seed(long lSeed);
+    long TurbulenceRandom(long lSeed);
+    void TurbulenceInit(long lSeed);
+    double TurbulenceNoise2(int nColorChannel, double vec[2], StitchInfo *pStitchInfo);
+    double turbulence(int nColorChannel, double *point);
+
     double XbaseFrequency, YbaseFrequency;
     int numOctaves;
     double seed;
     bool stitchTiles;
-    FilterTurbulenceType type;    
+    FilterTurbulenceType type;
+    bool updated;
+    NR::IRect updated_area;
+    NRPixBlock *pix;
+    unsigned char *pix_data;
+
+    int uLatticeSelector[BSize + BSize + 2];
+    double fGradient[4][BSize + BSize + 2][2];
+
+    double fTileWidth;
+    double fTileHeight;
+
+    double fTileX;
+    double fTileY;
 };
 
-} /* namespace NR */
+} /* namespace Filters */
+} /* namespace Inkscape */
 
 #endif /* __NR_FILTER_TURBULENCE_H__ */
 /*