[GRASS-dev] [GRASS GIS] #3600: m.nviz.image doesn't produce any output

[GRASS GIS]

#3600: m.nviz.image doesn't produce any output
---------------------+-------------------------
 Reporter:  guano    |      Owner:  grass-dev@…
     Type:  defect   |     Status:  new
 Priority:  normal   |  Milestone:
Component:  Default  |    Version:  7.0.4
 Keywords:           |        CPU:  Unspecified
 Platform:  MacOSX   |
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 When trying to create some images with m.nviz.image, but all I get as
 output is a 11 byte ppm...

 All I get is an unreadable ppm with 11 bytes. With format=tif, I get an
 error creating the file (TIFFScanlineSize64: Computed scanline size is
 zero.).

 Opening the ppm file into a text editor, I see that all that was written
 was the header, and that the image size was 0,0:

 P6
 0 0
 255

 navigating trough the code, I see that m.nviz.image calls GS_write_ppm to
 write the file, which is in lib/ogsf/gsd_img_ppm.c:


 int GS_write_ppm(const char *name)
 {
     unsigned int x;
     int y;
     unsigned int xsize, ysize;
     FILE *fp;
     unsigned char *pixbuf;

     gsd_getimage(&pixbuf, &xsize, &ysize);

     if (NULL == (fp = fopen(name, "w"))) {
         G_warning(_("Unable to open file <%s> for writing"), name);
         return (1);
     }

     fprintf(fp, "P6\n%d %d\n255\n", xsize, ysize);

     for (y = ysize - 1; y >= 0; y--) {
         for (x = 0; x < xsize; x++) {
             unsigned char r = pixbuf[(y * xsize + x) * 4 + 0];
             unsigned char g = pixbuf[(y * xsize + x) * 4 + 1];
             unsigned char b = pixbuf[(y * xsize + x) * 4 + 2];

             fputc((int)r, fp);
             fputc((int)g, fp);
             fputc((int)b, fp);
         }

     }
     G_free(pixbuf);
     fclose(fp);

     return (0);
 }


 GS_write_ppm calls gsd_getimage to get the actual image data and size.

 So it seems to me that gsd_getimage is not getting the image?

-- 
Ticket URL: <https://trac.osgeo.org/grass/ticket/3600>
GRASS GIS <https://grass.osgeo.org>