Bibliothèque de traitements d'images en virgule flottante.
http://la.buvette.org/photos/cumul/
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137 lines
2.7 KiB
137 lines
2.7 KiB
/* |
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* fimg-pnm.c |
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* |
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* |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include "string.h" |
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#include "../floatimg.h" |
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extern int verbosity; /* must be declared around main() */ |
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/* ---------------------------------------------------------------- */ |
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/* nouveau juin 2019, pendant la Ravebish */ |
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int fimg_load_from_pnm(char *fname, FloatImg *head, int notused) |
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{ |
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FILE *fp; |
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int width, height, maxval; |
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int foo, line, column; |
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unsigned char *buffline, *idxrd; |
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float *Rptr, *Gptr, *Bptr; |
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if (NULL==head) { |
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fprintf(stderr, "%s : head ptr is %p\n", __func__, head); |
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return -8; |
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} |
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if (NULL==(fp=fopen(fname, "r"))) { |
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perror(fname); |
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exit(1); |
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} |
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foo = fscanf(fp, "P6 %d %d %d", &width, &height, &maxval); |
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if (3 != foo) { |
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fprintf(stderr, "%s : fscanf -> %d\n", __func__, foo); |
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return -1; |
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} |
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if (verbosity) { |
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fprintf(stderr, "%s is %dx%d , max=%d\n",fname, width, height, maxval); |
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} |
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if (NULL==(buffline=calloc(3, width))) { |
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fprintf(stderr, "%s on %s : memory error\n", __func__, fname); |
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return -2; |
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} |
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foo = fimg_create(head, width, height, 3); |
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if (foo) { |
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fprintf(stderr, "%s : create floatimg -> %d\n", __func__, foo); |
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exit(1); |
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} |
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fseek(fp, 1L, SEEK_CUR); /* black magic */ |
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Rptr = head->R; Gptr = head->G; Bptr = head->B; |
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for (line=0; line<height; line++) { |
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foo = fread(buffline, 3, width, fp); |
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// fprintf(stderr, "line %d read %d\n", line, width); |
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idxrd = buffline; |
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for (column=0; column<width; column++) |
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{ |
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*Rptr++ = (float)*idxrd++; |
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*Gptr++ = (float)*idxrd++; |
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*Bptr++ = (float)*idxrd++; |
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} |
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} |
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fclose(fp); |
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return 0; |
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} |
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/* ---------------------------------------------------------------- */ |
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int fimg_save_as_pnm(FloatImg *head, char *fname, int notused) |
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{ |
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FILE *fp; |
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float maximum, fk; |
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int idx, sz, Rv, Gv, Bv, foo; |
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#if DEBUG_LEVEL |
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fprintf(stderr, ">>> %-25s ( %p '%s' %d )\n", __func__, head, |
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fname, notused); |
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#endif |
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if (head->type != 3) { |
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#if DEBUG_LEVEL |
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fprintf(stderr, "%s : type %d is bad.\n", __func__, head->type); |
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#endif |
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return -1; |
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} |
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if (NULL==(fp=fopen(fname, "w"))) { |
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perror(fname); |
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return -1; |
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} |
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fprintf(fp, "P3\n%d %d\n", head->width, head->height); |
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maximum = fimg_get_maxvalue(head); |
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fprintf(fp, "# maxval %15f\n", maximum); |
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fk = maximum / 65536.0; |
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fprintf(fp, "# divisor %15f\n", fk); |
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fprintf(fp, "65535\n"); |
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sz = head->width*head->height; |
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foo = 0; |
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for (idx=0; idx<sz; idx++) { |
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if (fk > 0) { |
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Rv = (int)(head->R[idx] / fk); |
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Gv = (int)(head->G[idx] / fk); |
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Bv = (int)(head->B[idx] / fk); |
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} |
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else { |
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Rv = Gv = Bv = 0; |
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} |
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foo += fprintf(fp, "%d %d %d", Rv, Gv, Bv); |
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if (foo > 60) { |
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fputs("\n", fp); foo = 0; |
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} |
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else { |
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fputs(" ", fp); foo++; |
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} |
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} |
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fputs("\n", fp); |
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fclose(fp); |
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return 0; |
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} |
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/* ---------------------------------------------------------------- */
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