diff options
Diffstat (limited to 'generator/pgmkernel.c')
-rw-r--r-- | generator/pgmkernel.c | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/generator/pgmkernel.c b/generator/pgmkernel.c index 4f40f003..ec634c16 100644 --- a/generator/pgmkernel.c +++ b/generator/pgmkernel.c @@ -174,14 +174,14 @@ writeKernel(FILE * const ofP, unsigned int const halfRows) { unsigned int row; - + pgm_writepgminit(stdout, cols, rows, maxval, 0); for (row = 0; row < halfRows; ++row) pgm_writepgmrow(stdout, halfKernel[row], cols, maxval, 0); /* Now write out the same rows in reverse order. */ - + for (; row < rows; ++row) pgm_writepgmrow(stdout, halfKernel[rows-1-row], cols, maxval, 0); } @@ -193,12 +193,15 @@ main(int argc, const char * argv[]) { struct CmdlineInfo cmdline; unsigned int arows; - int arow; + unsigned int arow; double xcenter, ycenter; /* row, column "number" of center of kernel */ double tMax; /* The maximum t value over all pixels */ - gray ** destarray; + gray ** halfKernel; + /* The upper half of the kernel we generate. The lower half is + just the mirror image of this. + */ pm_proginit(&argc, argv); @@ -213,27 +216,28 @@ main(int argc, const char * argv[]) { arows = (cmdline.rows + 1) / 2; /* Half the number of rows. Add 1 if odd. */ - destarray = pgm_allocarray(cmdline.cols, arows); + halfKernel = pgm_allocarray(cmdline.cols, arows); for (arow = 0; arow < arows; ++arow) { double const dy2 = SQR(arow - ycenter); unsigned int col; - - for (col = 0; col < cmdline.cols; ++col) { + for (col = 0; col < (cmdline.cols +1) / 2; ++col) { double const dx2 = SQR(col - xcenter); double const normalized = t(dx2, dy2, cmdline.weight) / 2 / tMax; - destarray[arow][col] = destarray[arow][cmdline.cols - col - 1] = - ROUNDU(cmdline.maxval * (0.5 + normalized)); + gray const grayval = ROUNDU(cmdline.maxval * (0.5 + normalized)); + + halfKernel[arow][col ] = grayval; + halfKernel[arow][cmdline.cols - col - 1] = grayval; } } writeKernel(stdout, cmdline.cols, cmdline.rows, cmdline.maxval, - destarray, arows); + halfKernel, arows); - pgm_freearray(destarray, arows); + pgm_freearray(halfKernel, arows); return 0; } |