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Bug 573695 – 1-bit white background saved as PBM becomes all black 

2009-03-12  Sven Neumann  <sven@gimp.org>

	Bug 573695 – 1-bit white background saved as PBM becomes all 
black

	* plug-ins/common/file-pnm.c: look at the colormap and test 
which
	of the two colors is black and which is white.


svn path=/trunk/; revision=28144
This commit is contained in:
Sven Neumann 2009-03-12 22:18:44 +00:00 committed by Sven Neumann
parent 44b368b1cd
commit afc35ae7e2
2 changed files with 38 additions and 23 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
2009-03-12 Sven Neumann <sven@gimp.org>
* plug-ins/common/file-pnm.c:
2009-03-12 Sven Neumann <sven@gimp.org>
Bug 573070 – crash when working with 1x3200 pixel image

57
plug-ins/common/file-pnm.c
View File

@ -93,14 +93,14 @@ typedef struct _PNMInfo
/* Contains the information needed to write out PNM rows */
typedef struct _PNMRowInfo
{
gint fd; /* File descriptor */
gchar *rowbuf; /* Buffer for writing out rows */
gint xres; /* X resolution */
gint np; /* Number of planes */
guchar *red; /* Colormap red */
guchar *grn; /* Colormap green */
guchar *blu; /* Colormap blue */
gboolean solid_white; /* image is all white (pbm only) */
gint fd; /* File descriptor */
gchar *rowbuf; /* Buffer for writing out rows */
gint xres; /* X resolution */
gint np; /* Number of planes */
guchar *red; /* Colormap red */
guchar *grn; /* Colormap green */
guchar *blu; /* Colormap blue */
gboolean zero_is_black; /* index zero is black (PBM only) */
} PNMRowInfo;
/* Save info */
@ -818,15 +818,12 @@ pnmsaverow_raw_pbm (PNMRowInfo *ri,
rbcur[b] = 0;
if (ri->solid_white)
continue;
for (i = 0; i < 8; i++) /* each bit in this byte */
{
if (p >= ri->xres)
break;
if (data[p] == 0)
if (data[p] != ri->zero_is_black)
rbcur[b] |= (char) (1 << (7 - i));
p++;
@ -856,7 +853,7 @@ pnmsaverow_ascii_pbm (PNMRowInfo *ri,
rbcur++;
}
if (ri->solid_white || data[i] != 0)
if (data[i] == ri->zero_is_black)
rbcur[i] = '0';
else
rbcur[i] = '1';
@ -1069,31 +1066,45 @@ save_image (const gchar *filename,
}
}
rowinfo.solid_white = FALSE;
rowinfo.zero_is_black = FALSE;
if (drawable_type == GIMP_INDEXED_IMAGE)
{
guchar *cmap;
gint colors;
gint num_colors;
cmap = gimp_image_get_colormap (image_ID, &colors);
cmap = gimp_image_get_colormap (image_ID, &num_colors);
if (pbm)
{
/* If we are dealing with an all-white image, then the colormap
* has one entry only and we can't assume that the first entry
* is black and the second is white.
*/
if (colors == 1 && cmap[0])
/* Test which of the two colors is white and which is black */
switch (num_colors)
{
rowinfo.solid_white = TRUE;
case 1:
rowinfo.zero_is_black = (GIMP_RGB_LUMINANCE (cmap[0],
cmap[1],
cmap[2]) < 128);
break;
case 2:
rowinfo.zero_is_black = (GIMP_RGB_LUMINANCE (cmap[0],
cmap[1],
cmap[2]) <
GIMP_RGB_LUMINANCE (cmap[3],
cmap[4],
cmap[5]));
break;
default:
g_warning ("images saved as PBM should be black/white");
break;
}
}
else
{
gint i;
for (i = 0; i < colors; i++)
for (i = 0; i < num_colors; i++)
{
red[i] = *cmap++;
grn[i] = *cmap++;