In my efforts to learn gegl, I extended the load-ppm.c operation to support
PGM files.
Do I have permission to commit this on my own, or should I open a bug
request?
On my todo list is next to create a npy save file operation, to make it
easy to examine floating point gray level images in numpy.
Regards,
Dov
Diff for ppm-load.c follows:
diff --git a/operations/external/ppm-load.c b/operations/external/ppm-load.c
index e22521c..3b25438 100644
--- a/operations/external/ppm-load.c
+++ b/operations/external/ppm-load.c
@@ -31,7 +31,8 @@ gegl_chant_file_path (path, _("File"), "", _("Path of
file to load."))
#define MAX_CHARS_IN_ROW 500
#define CHANNEL_COUNT 3
-#define ASCII_P 80
+#define CHANNEL_COUNT_GRAY 1
+#define ASCII_P 'P'
#include "gegl-chant.h"
#include <stdio.h>
@@ -39,8 +40,10 @@ gegl_chant_file_path (path, _("File"), "", _("Path of
file to load."))
#include <errno.h>
typedef enum {
- PIXMAP_ASCII = 51,
- PIXMAP_RAW = 54,
+ PIXMAP_ASCII_GRAY = '2',
+ PIXMAP_ASCII = '3',
+ PIXMAP_RAW_GRAY = '5',
+ PIXMAP_RAW = '6',
} map_type;
typedef struct {
@@ -61,12 +64,15 @@ ppm_load_read_header(FILE *fp,
//gchar *retval;
gchar header[MAX_CHARS_IN_ROW];
gint maxval;
+ int channel_count;
/* Check the PPM file Type P3 or P6 */
fgets (header,MAX_CHARS_IN_ROW,fp);
if (header[0] != ASCII_P ||
- (header[1] != PIXMAP_ASCII &&
+ (header[1] != PIXMAP_ASCII_GRAY &&
+ header[1] != PIXMAP_ASCII &&
+ header[1] != PIXMAP_RAW_GRAY &&
header[1] != PIXMAP_RAW))
{
g_warning ("Image is not a portable pixmap");
@@ -75,6 +81,11 @@ ppm_load_read_header(FILE *fp,
img->type = header[1];
+ if (img->type == PIXMAP_ASCII_GRAY || img->type == PIXMAP_ASCII_GRAY)
+ channel_count = CHANNEL_COUNT_GRAY;
+ else
+ channel_count = CHANNEL_COUNT;
+
/* Check the Comments */
fgets (header,MAX_CHARS_IN_ROW,fp);
while(header[0] == '#')
@@ -139,7 +150,9 @@ ppm_load_read_header(FILE *fp,
g_warning ("Illegal width/height: %ld/%ld", img->width,
img->height);
return FALSE;
}
- img->numsamples = img->width * img->height * CHANNEL_COUNT;
+
+
+ img->numsamples = img->width * img->height * channel_count;
return TRUE;
}
@@ -150,7 +163,7 @@ ppm_load_read_image(FILE *fp,
{
guint i;
- if (img->type == PIXMAP_RAW)
+ if (img->type == PIXMAP_RAW || img->type == PIXMAP_RAW_GRAY)
{
fread (img->data, img->bpc, img->numsamples, fp);
@@ -168,7 +181,7 @@ ppm_load_read_image(FILE *fp,
}
else
{
- /* Plain PPM format */
+ /* Plain PPM or PGM format */
if (img->bpc == sizeof (guchar))
{
@@ -215,21 +228,26 @@ get_bounding_box (GeglOperation *operation)
if (!ppm_load_read_header (fp, &img))
goto out;
- switch (img.bpc)
+ if (img.bpc == 1)
{
- case 1:
+ if (img.numsamples == 3)
gegl_operation_set_format (operation, "output",
babl_format ("R'G'B' u8"));
- break;
-
- case 2:
+ else
+ gegl_operation_set_format (operation, "output",
+ babl_format ("Y' u8"));
+ }
+ else if (img.bpc == 2)
+ {
+ if (img.numsamples == 3)
gegl_operation_set_format (operation, "output",
babl_format ("R'G'B' u16"));
- break;
-
- default:
- g_warning ("%s: Programmer stupidity error", G_STRLOC);
+ else
+ gegl_operation_set_format (operation, "output",
+ babl_format ("Y' u8"));
}
+ else
+ g_warning ("%s: Programmer stupidity error", G_STRLOC);
result.width = img.width;
result.height = img.height;
@@ -279,39 +297,49 @@ process (GeglOperation *operation,
rect.height = img.height;
rect.width = img.width;
- switch (img.bpc)
+ if (img.bpc == 1)
{
- case 1:
+ if (img.numsamples == 3)
gegl_buffer_get (output, &rect, 1.0, babl_format ("R'G'B' u8"),
img.data,
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
- break;
-
- case 2:
+ else
+ gegl_buffer_get (output, &rect, 1.0, babl_format ("Y' u8"),
img.data,
+ GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+ }
+ else if (img.bpc == 2)
+ {
+ if (img.numsamples == 3)
gegl_buffer_get (output, &rect, 1.0, babl_format ("R'G'B' u16"),
img.data,
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
- break;
-
- default:
- g_warning ("%s: Programmer stupidity error", G_STRLOC);
+ else
+ gegl_buffer_get (output, &rect, 1.0, babl_format ("Y' u16"),
img.data,
+ GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
}
+ else
+ g_warning ("%s: Programmer stupidity error", G_STRLOC);
ppm_load_read_image (fp, &img);
- switch (img.bpc)
+ if (img.bpc == 1)
{
- case 1:
+ if (img.numsamples == 3)
gegl_buffer_set (output, &rect, 0, babl_format ("R'G'B' u8"),
img.data,
GEGL_AUTO_ROWSTRIDE);
- break;
-
- case 2:
+ else
+ gegl_buffer_set (output, &rect, 0, babl_format ("Y' u8"), img.data,
+ GEGL_AUTO_ROWSTRIDE);
+ }
+ else if (img.bpc == 2)
+ {
+ if (img.numsamples == 3)
gegl_buffer_set (output, &rect, 0, babl_format ("R'G'B' u16"),
img.data,
GEGL_AUTO_ROWSTRIDE);
- break;
-
- default:
- g_warning ("%s: Programmer stupidity error", G_STRLOC);
+ else
+ gegl_buffer_set (output, &rect, 0, babl_format ("Y' u16"),
img.data,
+ GEGL_AUTO_ROWSTRIDE);
}
+ else
+ g_warning ("%s: Programmer stupidity error", G_STRLOC);
g_free (img.data);
@@ -351,6 +379,7 @@ gegl_chant_class_init (GeglChantClass *klass)
NULL);
gegl_extension_handler_register (".ppm", "gegl:ppm-load");
+ gegl_extension_handler_register (".pgm", "gegl:ppm-load");
}
#endif
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