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Add support for reading 16-bit raw PPM files

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This should be useful for loading the output of programs such
as dcraw.
This commit is contained in:
Mukund Sivaraman 2011-03-26 15:09:59 +05:30
parent bc8d5f84d6
commit 647f0ada2a
1 changed files with 48 additions and 15 deletions
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49
plug-ins/common/file-pnm.c
View file

@ -569,10 +569,8 @@ load_image (const gchar *filename,
_("Premature end of file."));
pnminfo->maxval = g_ascii_isdigit (*buf) ? atoi (buf) : 0;
CHECK_FOR_ERROR (((pnminfo->maxval<=0)
|| (pnminfo->maxval>255 && !pnminfo->asciibody)),
pnminfo->jmpbuf,
_("Unsupported maximum value."));
CHECK_FOR_ERROR (((pnminfo->maxval<=0) || (pnminfo->maxval>65535)),
pnminfo->jmpbuf, _("Unsupported maximum value."));
}
/* Create a new image of the proper size and associate the filename with it.
@ -703,12 +701,23 @@ pnm_load_raw (PNMScanner *scan,
PNMInfo *info,
GimpPixelRgn *pixel_rgn)
{
guchar *data, *d;
gint bpc;
guchar *data, *bdata, *d, *b;
gint x, y, i;
gint start, end, scanlines;
gint fd;
data = g_new (guchar, gimp_tile_height () * info->xres * info->np);
if (info->maxval > 255)
bpc = 2;
else
bpc = 1;
data = g_new (guchar, gimp_tile_height () * info->xres * info->np * bpc);
bdata = NULL;
if (bpc > 1)
bdata = g_new (guchar, gimp_tile_height () * info->xres * info->np);
fd = pnmscanner_fd (scan);
for (y = 0; y < info->yres; )
@ -718,14 +727,31 @@ pnm_load_raw (PNMScanner *scan,
end = MIN (end, info->yres);
scanlines = end - start;
d = data;
b = bdata;
for (i = 0; i < scanlines; i++)
{
CHECK_FOR_ERROR ((info->xres * info->np
!= read (fd, d, info->xres * info->np)),
CHECK_FOR_ERROR ((info->xres * info->np * bpc
!= read (fd, d, info->xres * info->np * bpc)),
info->jmpbuf,
_("Premature end of file."));
if (bpc > 1)
{
for (x = 0; x < info->xres * info->np; x++)
{
int v;
v = *d++ << 8;
v += *d++;
b[x] = MIN (v, info->maxval); /* guard against overflow */
b[x] = 255.0 * (gdouble) v / (gdouble) info->maxval;
}
b += info->xres * info->np;
}
else
{
if (info->maxval != 255) /* Normalize if needed */
{
for (x = 0; x < info->xres * info->np; x++)
@ -737,15 +763,22 @@ pnm_load_raw (PNMScanner *scan,
d += info->xres * info->np;
}
}
gimp_progress_update ((double) y / (double) info->yres);
if (bpc > 1)
gimp_pixel_rgn_set_rect (pixel_rgn, bdata, 0, y, info->xres, scanlines);
else
gimp_pixel_rgn_set_rect (pixel_rgn, data, 0, y, info->xres, scanlines);
y += scanlines;
}
gimp_progress_update (1.0);
g_free (data);
g_free (bdata);
}
static void