diff options
Diffstat (limited to 'analyzer/pamtilt.c')
| -rw-r--r-- | analyzer/pamtilt.c | 51 |
1 files changed, 32 insertions, 19 deletions
diff --git a/analyzer/pamtilt.c b/analyzer/pamtilt.c index 5d1d1986..8fa34791 100644 --- a/analyzer/pamtilt.c +++ b/analyzer/pamtilt.c @@ -47,7 +47,7 @@ abandon(void) { static void -parseCommandLine(int argc, char *argv[], +parseCommandLine(int argc, const char ** const argv, struct cmdlineInfo * const cmdlineP) { static optEntry option_def[50]; @@ -76,7 +76,7 @@ parseCommandLine(int argc, char *argv[], opt.opt_table = option_def; opt.short_allowed = FALSE; /* no short options used */ opt.allowNegNum = FALSE; /* don't allow negative values */ - pm_optParseOptions3(&argc, argv, opt, sizeof(opt), 0); + pm_optParseOptions3(&argc, (char **)argv, opt, sizeof(opt), 0); if (cmdlineP->hstep < 1) pm_error("-hstep must be at least 1 column."); @@ -143,9 +143,6 @@ load(const struct pam * const pamP, tuplerow = pnm_allocpamrow(pamP); MALLOCARRAY(pixels, pamP->height); - if (pixels == NULL) - pm_error("Unable to allocate array of %u pixel rows", - pamP->height); if (pixels == NULL) pm_error("Unable to allocate array of %u rows", pamP->height); @@ -214,9 +211,32 @@ replacePixelValuesWithScaledDiffs( +static unsigned long +totalBrightness(sample ** const pixelWindow, + unsigned int const hsampleCt, + float const dy) { +/*---------------------------------------------------------------------------- + Total brightness of samples in the line that goes from the top left corner + of 'pixelWindow' down to the right at 'dy' rows per column. +-----------------------------------------------------------------------------*/ + unsigned long total; + unsigned int i; + float rowOffset; + + for (i = 0, rowOffset = 0.5, total = 0; + i < hsampleCt; + ++i, rowOffset += dy) { + + total += pixelWindow[(unsigned)rowOffset][i]; + } + return total; +} + + + static void scoreAngleRegion(sample ** const pixels, - unsigned int const hsamples, + unsigned int const hsampleCt, unsigned int const startRow, unsigned int const endRow, unsigned int const vstep, @@ -234,7 +254,7 @@ scoreAngleRegion(sample ** const pixels, Instead of a tilt angle, we have 'dy', the slope (downward) of the lines in our assumed tilt. -----------------------------------------------------------------------------*/ - double const tscale = 1.0 / hsamples; + double const tscale = 1.0 / hsampleCt; unsigned int row; double sum; @@ -245,17 +265,10 @@ scoreAngleRegion(sample ** const pixels, /* Number of lines that went into 'total' */ for (row = startRow, sum = 0.0, n = 0; row < endRow; row += vstep) { - float o; - long t; /* total brightness of the samples in the line */ - double dt; /* mean brightness of the samples in the line */ + double const dt = + tscale * totalBrightness(&pixels[row], hsampleCt, dy); + /* mean brightness of the samples in the line */ - unsigned int i; - - for (i = 0, t = 0, o = 0.5; - i < hsamples; - t += pixels[(int)(row + o)][i], ++i, o += dy) { - } - dt = tscale * t; sum += dt * dt; n += 1; } @@ -478,7 +491,7 @@ getAngle(const struct pam * const pamP, int -main(int argc, char *argv[]) { +main(int argc, const char ** argv) { struct cmdlineInfo cmdline; struct pam pam; @@ -488,7 +501,7 @@ main(int argc, char *argv[]) { unsigned int vstep; /* vertical step size */ float angle; - pgm_init(&argc, argv); /* initialize netpbm system */ + pm_proginit(&argc, argv); parseCommandLine(argc, argv, &cmdline); |