libtthimage/Lib/gradient.c

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2023-09-18 08:46:13 +02:00
/*
gradient.c
----------
new: Sun Sep 17 20:47:57 UTC 2023
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include "../tthimage.h"
/*::------------------------------------------------------------------::*/
int Image_plot_H_gradient(char *fname, int w, int h)
{
Image_Desc *img;
int x, y, pix, foo;
float fval;
if ( (img = Image_alloc(w, h, IMAGE_RGB)) == NULL ) {
#if DEBUG_LEVEL
fprintf(stderr, "%s: alloc of img failed, file=%s\n", __func__, fname);
#endif
return IMAGE_NO_MEM;
}
for (x=0; x<w; x++) {
fval = (float)x / (float)(w-1);
pix = (int)(fval * 255.0);
#if DEBUG_LEVEL > 1
printf("%5d %6.3f %5d\n", x, fval, pix);
#endif
for (y=0; y<h; y++) {
(img->Rpix[y])[x] = pix;
(img->Gpix[y])[x] = pix;
(img->Bpix[y])[x] = pix;
}
}
foo = Image_TGA_save(fname, img, 0);
if (foo) {
fprintf(stderr, "%s: err write to '%s'\n", __func__, fname);
return FULL_NUCKED;
}
Image_DeAllocate(img); free(img);
return FUNC_IS_BETA;
}
/*::------------------------------------------------------------------::*/
int Image_plot_V_gradient(char *fname, int w, int h)
{
return FUNC_IS_ALPHA;
}
/*::------------------------------------------------------------------::*/