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| 260 | from an arbitrary center */ |
260 | from an arbitrary center */ |
| 261 | value_type ff_r2y(value_type d,value_type m){ |
261 | value_type ff_r2y(value_type d,value_type m){ |
| 262 | return (value_type)RINT(m*costab[abs(d-256) % COSTABSIZE]); |
262 | return (value_type)RINT(m*costab[abs(d-256) % COSTABSIZE]); |
| 263 | } |
263 | } |
| 264 | 264 | ||
| - | 265 | /* Attention! This is NOT a function. It is internally used to calculate the variable "d". */ |
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| - | 266 | value_type ff_c2d_negated(value_type x, value_type y) { |
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| - | 267 | // NOTE: FilterFactory uses c2d(x,y):=atan2(y,x), but d:=atan2(-y,-x) |
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| - | 268 | // Due to compatibility reasons, we implement it the same way! |
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| - | 269 | // Sign of y difference is negated, as we are dealing with top-down coordinates angle is "observed" |
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| - | 270 | return (value_type)RINT(TO_FFANGLE(atan2(-y,-x))); |
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| - | 271 | } |
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| - | 272 | ||
| 265 | /* c2d(x,y) Angle displacement of the pixel at coordinates x,y */ |
273 | /* c2d(x,y) Angle displacement of the pixel at coordinates x,y */ |
| 266 | /* note, sign of y difference is negated, as we are dealing with top-down coordinates |
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| 267 | angle is "observed" */ |
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| 268 | value_type ff_c2d(value_type x,value_type y){ |
274 | value_type ff_c2d(value_type x,value_type y){ |
| 269 | // Behavior of FilterFoundry <1.7: |
275 | // Behavior of FilterFoundry <1.7: |
| 270 | //return RINT(TO_FFANGLE(atan2(-y,-x))); |
276 | //return ff_c2d_negated(x,y); |
| 271 | 277 | ||
| 272 | // Behavior in FilterFoundry 1.7+: Matches FilterFactory |
278 | // Behavior in FilterFoundry 1.7+: Matches FilterFactory |
| 273 | return (value_type)RINT(TO_FFANGLE(atan2(y,x))); |
279 | return (value_type)RINT(TO_FFANGLE(atan2(y,x))); |
| 274 | } |
280 | } |
| 275 | 281 | ||