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Issue 1917 - GIMP-2.99 uses sRGB instead of the user-selected monitor profile 

Since the space invasion commit, colors entering and leaving a
GimpColorTransform were often implicitly converted up to three times,
the code was simply not properly ported to babl formats with spaces.

Fix GimpColorTransform to only ever transform colors between the
specified src and dest profiles, ignoring the space of any babl
formats involved.

Also, always return a non-NULL transform, even if the transform could
be done by a simply gegl_buffer_copy(), this way we can make sure in
one central place that transforms are done correctly, no matter if
babl or lcms is used.

Added quite some docs and comments to make clear what happens.
This commit is contained in:
Michael Natterer 2018-07-31 20:00:35 +02:00
parent b405b0364c
commit d7345a6a1f
1 changed files with 102 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

127
libgimpcolor/gimpcolortransform.c
View File

@ -69,11 +69,9 @@ struct _GimpColorTransformPrivate
{
GimpColorProfile *src_profile;
const Babl *src_format;
const Babl *src_space_format;
GimpColorProfile *dest_profile;
const Babl *dest_format;
const Babl *dest_space_format;
cmsHTRANSFORM transform;
const Babl *fish;
@ -169,8 +167,20 @@ gimp_color_transform_finalize (GObject *object)
*
* This function creates an color transform.
*
* Return value: the #GimpColorTransform, or %NULL if no transform is needed
* to convert between pixels of @src_profile and @dest_profile.
* The color transform is determined exclusively by @src_profile and
* @dest_profile. The color spaces of @src_format and @dest_format are
* ignored, the formats are only used to decide between what pixel
* encodings to transform.
*
* Note: this function used to return %NULL if
* gimp_color_transform_can_gegl_copy() returned %TRUE for
* @src_profile and @dest_profile. This is no longer the case because
* special care has to be taken not to perform multiple implicit color
* transforms caused by babl formats with color spaces. Now, it always
* returns a non-%NULL transform and the code takes care of doing only
* exactly the requested color transform.
*
* Return value: the #GimpColorTransform, or %NULL if there was an error.
*
* Since: 2.10
**/
@ -195,29 +205,32 @@ gimp_color_transform_new (GimpColorProfile *src_profile,
g_return_val_if_fail (GIMP_IS_COLOR_PROFILE (dest_profile), NULL);
g_return_val_if_fail (dest_format != NULL, NULL);
if (gimp_color_transform_can_gegl_copy (src_profile, dest_profile))
return NULL;
transform = g_object_new (GIMP_TYPE_COLOR_TRANSFORM, NULL);
priv = transform->priv;
priv->src_space_format = gimp_color_profile_get_format (src_profile,
src_format,
BABL_ICC_INTENT_RELATIVE_COLORIMETRIC,
&error);
if (! priv->src_space_format)
/* only src_profile and dest_profile must determine the transform's
* color spaces, create formats with src_format's and dest_format's
* encoding, and the profiles' color spaces; see process_pixels()
* and process_buffer().
*/
priv->src_format = gimp_color_profile_get_format (src_profile,
src_format,
BABL_ICC_INTENT_RELATIVE_COLORIMETRIC,
&error);
if (! priv->src_format)
{
g_printerr ("%s: error making format: %s\n",
G_STRFUNC, error->message);
g_clear_error (&error);
}
priv->dest_space_format = gimp_color_profile_get_format (dest_profile,
dest_format,
rendering_intent,
&error);
if (! priv->dest_space_format)
priv->dest_format = gimp_color_profile_get_format (dest_profile,
dest_format,
rendering_intent,
&error);
if (! priv->dest_format)
{
g_printerr ("%s: error making format: %s\n",
G_STRFUNC, error->message);
@ -225,12 +238,10 @@ gimp_color_transform_new (GimpColorProfile *src_profile,
}
if (! g_getenv ("GIMP_COLOR_TRANSFORM_DISABLE_BABL") &&
priv->src_space_format && priv->dest_space_format)
priv->src_format && priv->dest_format)
{
priv->src_format = src_format;
priv->dest_format = dest_format;
priv->fish = babl_fish (priv->src_space_format,
priv->dest_space_format);
priv->fish = babl_fish (priv->src_format,
priv->dest_format);
g_printerr ("%s: using babl for '%s' -> '%s'\n",
G_STRFUNC,
@ -240,8 +251,14 @@ gimp_color_transform_new (GimpColorProfile *src_profile,
return transform;
}
priv->src_space_format = NULL;
priv->dest_space_format = NULL;
/* see above: when using lcms, don't mess with formats with color
* spaces, gimp_color_profile_get_lcms_format() might return the
* same format and it must be without space
*/
src_format = babl_format_with_space (babl_format_get_encoding (src_format),
NULL);
dest_format = babl_format_with_space (babl_format_get_encoding (dest_format),
NULL);
priv->src_format = gimp_color_profile_get_lcms_format (src_format,
&lcms_src_format);
@ -292,7 +309,10 @@ gimp_color_transform_new (GimpColorProfile *src_profile,
*
* This function creates a simulation / proofing color transform.
*
* Return value: the #GimpColorTransform, or %NULL.
* See gimp_color_transform_new() about the color spaces to transform
* between.
*
* Return value: the #GimpColorTransform, or %NULL if there was an error.
*
* Since: 2.10
**/
@ -328,6 +348,14 @@ gimp_color_transform_new_proofing (GimpColorProfile *src_profile,
dest_lcms = gimp_color_profile_get_lcms_profile (dest_profile);
proof_lcms = gimp_color_profile_get_lcms_profile (proof_profile);
/* see gimp_color_transform_new(), we can't have color spaces
* on the formats
*/
src_format = babl_format_with_space (babl_format_get_encoding (src_format),
NULL);
dest_format = babl_format_with_space (babl_format_get_encoding (dest_format),
NULL);
priv->src_format = gimp_color_profile_get_lcms_format (src_format,
&lcms_src_format);
priv->dest_format = gimp_color_profile_get_lcms_format (dest_format,
@ -375,6 +403,11 @@ gimp_color_transform_new_proofing (GimpColorProfile *src_profile,
*
* This function transforms a contiguous line of pixels.
*
* See gimp_color_transform_new(): only the pixel encoding of
* @src_format and @dest_format is honored, their color spaces are
* ignored. The transform always takes place between the color spaces
* determined by @transform's color profiles.
*
* Since: 2.10
**/
void
@ -397,6 +430,18 @@ gimp_color_transform_process_pixels (GimpColorTransform *transform,
priv = transform->priv;
/* we must not do any babl color transforms when reading from
* src_pixels or writing to dest_pixels, so construct formats with
* src_format's and dest_format's encoding, and the transform's
* input and output color spaces.
*/
src_format =
babl_format_with_space (babl_format_get_encoding (src_format),
babl_format_get_space (priv->src_format));
dest_format =
babl_format_with_space (babl_format_get_encoding (dest_format),
babl_format_get_space (priv->dest_format));
if (src_format != priv->src_format)
{
src = g_malloc (length * babl_format_get_bytes_per_pixel (priv->src_format));
@ -453,6 +498,11 @@ gimp_color_transform_process_pixels (GimpColorTransform *transform,
*
* This function transforms buffer into another buffer.
*
* See gimp_color_transform_new(): only the pixel encoding of
* @src_buffer's and @dest_buffer's formats honored, their color
* spaces are ignored. The transform always takes place between the
* color spaces determined by @transform's color profiles.
*
* Since: 2.10
**/
void
@ -463,6 +513,8 @@ gimp_color_transform_process_buffer (GimpColorTransform *transform,
const GeglRectangle *dest_rect)
{
GimpColorTransformPrivate *priv;
const Babl *src_format;
const Babl *dest_format;
GeglBufferIterator *iter;
gint total_pixels;
gint done_pixels = 0;
@ -483,8 +535,26 @@ gimp_color_transform_process_buffer (GimpColorTransform *transform,
gegl_buffer_get_height (src_buffer));
}
/* we must not do any babl color transforms when reading from
* src_buffer or writing to dest_buffer, so construct formats with
* src_buffers's and dest_buffers's encoding, and the transform's
* input and output color spaces.
*/
src_format = gegl_buffer_get_format (src_buffer);
dest_format = gegl_buffer_get_format (dest_buffer);
src_format =
babl_format_with_space (babl_format_get_encoding (src_format),
babl_format_get_space (priv->src_format));
dest_format =
babl_format_with_space (babl_format_get_encoding (dest_format),
babl_format_get_space (priv->dest_format));
if (src_buffer != dest_buffer)
{
gegl_buffer_set_format (src_buffer, src_format);
gegl_buffer_set_format (dest_buffer, dest_format);
iter = gegl_buffer_iterator_new (src_buffer, src_rect, 0,
priv->src_format,
GEGL_ACCESS_READ,
@ -514,9 +584,14 @@ gimp_color_transform_process_buffer (GimpColorTransform *transform,
(gdouble) done_pixels /
(gdouble) total_pixels);
}
gegl_buffer_set_format (src_buffer, NULL);
gegl_buffer_set_format (dest_buffer, NULL);
}
else
{
gegl_buffer_set_format (src_buffer, src_format);
iter = gegl_buffer_iterator_new (src_buffer, src_rect, 0,
priv->src_format,
GEGL_ACCESS_READWRITE,
@ -541,6 +616,8 @@ gimp_color_transform_process_buffer (GimpColorTransform *transform,
(gdouble) done_pixels /
(gdouble) total_pixels);
}
gegl_buffer_set_format (src_buffer, NULL);
}
g_signal_emit (transform, gimp_color_transform_signals[PROGRESS], 0,