| 53,9 → 53,9 |
|---|
| costab[i] = cos(FFANGLE(i)); |
| } |
| for(i=0;i<TANTABSIZE;++i){ |
| if (i>=256) { |
| if (i>=TANTABSIZE/2) { |
| /* the last '-1' in the expression '512-i-1' is for FilterFactory compatibility, and to avoid the undefined pi/2 area */ |
| tantab[i] = -tantab[512-i-1]; |
| tantab[i] = -tantab[TANTABSIZE-i-1]; |
| } else { |
| tantab[i] = tan(FFANGLE(i)); |
| } |
| 239,15 → 239,20 |
|---|
| return (value_type)RINT(TRIGAMP*costab[abs(x) % COSTABSIZE]); |
| } |
| |
| /* tan(x) Bounded tangent function of x, where x is an integer |
| between -256 and 256, inclusive, and the value returned is |
| an integer between -512 and 512, inclusive (Windows) or |
| -1024 and 1024, inclusive (Mac OS) */ |
| /* tan(x) Tangent function of x, where x is an integer |
| between -256 and 256, inclusive. Althought the Filter Factory manual |
| stated that the return value is bounded to -512 and 512, inclusive (Windows) or |
| -1024 and 1024, inclusive (Mac OS), the output is actually NOT bounded! */ |
| value_type ff_tan(value_type x){ |
| // TODO: Shouldn't the output be bounded to -1024..1024, or do I understand the definition wrong? |
| // Following filter shows that the Filter Factory manual differs from the implementation. |
| // R = cos(x) > 1024 || cos(x) < -1024 || cos(-x) > 1024 || cos(-x) < -1024 ? 255 : 0 |
| // G = tan(x) > 1024 || tan(x) < -1024 || tan(-x) > 1024 || tan(-x) < -1024 ? 255 : 0 |
| // B = sin(x) > 1024 || sin(x) < -1024 || sin(-x) > 1024 || sin(-x) < -1024 ? 255 : 0 |
| // It outputs green stripes, showing that the output of tan() is not bounded. |
| // So, we do it the same way to stay compatible. |
| if (x < 0) x--; /* required for FilterFactory compatibility */ |
| while (x < 0) x += TANTABSIZE; |
| return (value_type)RINT(2*TRIGAMP*tantab[x % TANTABSIZE]); /* FIXME: why do we need factor 2? */ |
| return (value_type)RINT(2*TRIGAMP*tantab[x % TANTABSIZE]); // We need the x2 multiplicator for some reason |
| } |
| |
| /* r2x(d,m) x displacement of the pixel m units away, at an angle of d, |
| 300,6 → 305,7 |
|---|
| return v; |
| } |
| |
| /* Convolve. Applies a convolution matrix and divides with d. */ |
| value_type ff_cnv(value_type m11,value_type m12,value_type m13, |
| value_type m21,value_type m22,value_type m23, |
| value_type m31,value_type m32,value_type m33, |