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plug-ins: Keep GIF's full palette on import 

Resolves #414.
Currently GIMP only loads the palette colors used in a GIF, discarding 
the rest. This can cause issues when a consistent palette is required
(e.g. a video game sprite or background).
This patch uses either the global or local GIF max palette value to set 
the colormap size, thus retaining the full palette on import.
This commit is contained in:
Alx Sa 2023-06-15 21:07:22 +00:00
parent 3cf3097d62
commit 9efc552069
1 changed files with 5 additions and 9 deletions
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14
plug-ins/common/file-gif-load.c
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@ -129,7 +129,7 @@ DEFINE_STD_SET_I18N
static guchar used_cmap[3][256];
static guchar highest_used_index;
static guint highest_used_index;
static gboolean promote_to_rgb = FALSE;
static guchar gimp_cmap[768];
static GimpParasite *comment_parasite = NULL;
@ -255,7 +255,7 @@ gif_load (GimpProcedure *procedure,
if (! promote_to_rgb)
gimp_image_set_colormap (image,
gimp_cmap, highest_used_index + 1);
gimp_cmap, highest_used_index);
return_vals = gimp_procedure_new_return_values (procedure,
GIMP_PDB_SUCCESS,
@ -287,7 +287,7 @@ gif_load_thumb (GimpProcedure *procedure,
error);
if (! promote_to_rgb)
gimp_image_set_colormap (image, gimp_cmap, highest_used_index + 1);
gimp_image_set_colormap (image, gimp_cmap, highest_used_index);
return_vals = gimp_procedure_new_return_values (procedure,
GIMP_PDB_SUCCESS,
@ -466,8 +466,7 @@ load_image (GFile *file,
g_message (_("Non-square pixels. Image might look squashed."));
}
highest_used_index = 0;
highest_used_index = GifScreen.BitPixel;
while (TRUE)
{
@ -527,6 +526,7 @@ load_image (GFile *file,
fclose (fd);
return image; /* will be NULL if failed on first image! */
}
highest_used_index = bitPixel;
status = ReadImage (fd, file, LM_to_uint (buf[4], buf[5]),
LM_to_uint (buf[6], buf[7]),
@ -1251,8 +1251,6 @@ ReadImage (FILE *fd,
{
if (alpha_frame)
{
if (((guchar) v > highest_used_index) && !(v == Gif89.transparent))
highest_used_index = (guchar) v;
if (promote_to_rgb)
{
@ -1271,8 +1269,6 @@ ReadImage (FILE *fd,
}
else
{
if ((guchar) v > highest_used_index)
highest_used_index = (guchar) v;
temp = dest + (ypos * len) + xpos;
*temp = (guchar) v;