[gimp] plug-ins: add a "Save color profile" checkbox in WebP export.

[Jehan <jehanp src gnome org>]

commit 96e37dfdaf796fc804bf12e4eab1e32ed27f6ca9
Author: Jehan <jehan girinstud io>
Date:   Thu Jun 6 15:29:07 2019 +0200

    plug-ins: add a "Save color profile" checkbox in WebP export.
    
    Unlike most other formats, it didn't have one yet!

 plug-ins/file-webp/file-webp-dialog.c |  9 +++++
 plug-ins/file-webp/file-webp-save.c   | 66 ++++++++++++++++++++---------------
 plug-ins/file-webp/file-webp-save.h   |  1 +
 plug-ins/file-webp/file-webp.c        |  7 ++--
 4 files changed, 51 insertions(+), 32 deletions(-)
---
diff --git a/plug-ins/file-webp/file-webp-dialog.c b/plug-ins/file-webp/file-webp-dialog.c
index c98472555f..e6ecd7f488 100644
--- a/plug-ins/file-webp/file-webp-dialog.c
+++ b/plug-ins/file-webp/file-webp-dialog.c
@@ -396,6 +396,15 @@ save_dialog (WebPSaveParams *params,
                     G_CALLBACK (gimp_toggle_button_update),
                     &params->xmp);
 
+  /* Color profile */
+  toggle = gtk_check_button_new_with_mnemonic (_("Save color _profile"));
+  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), params->profile);
+  gtk_box_pack_start (GTK_BOX (vbox2), toggle, FALSE, FALSE, 0);
+  gtk_widget_show (toggle);
+
+  g_signal_connect (toggle, "toggled",
+                    G_CALLBACK (gimp_toggle_button_update),
+                    &params->profile);
 
   gtk_widget_show (dialog);
 
diff --git a/plug-ins/file-webp/file-webp-save.c b/plug-ins/file-webp/file-webp-save.c
index 3d4a087666..009914ad7d 100644
--- a/plug-ins/file-webp/file-webp-save.c
+++ b/plug-ins/file-webp/file-webp-save.c
@@ -163,40 +163,43 @@ save_layer (const gchar    *filename,
   gboolean          out_linear = FALSE;
   int               res;
 
-  profile = gimp_image_get_color_profile (image_ID);
-
-  /* If a profile is explicitly set, follow its TRC, whatever the
-   * storage format.
-   */
-  if (profile && gimp_color_profile_is_linear (profile))
-    out_linear = TRUE;
-
-  /* When no profile was explicitly set, since WebP is apparently
-   * 8-bit max, we export it as sRGB to avoid shadow posterization
-   * (we don't care about storage TRC).
-   * We do an exception for 8-bit linear work image to avoid
-   * conversion loss while the precision is the same.
-   */
-  if (! profile)
+  if (params->profile)
     {
-      /* There is always an effective profile. */
-      profile = gimp_image_get_effective_color_profile (image_ID);
+      profile = gimp_image_get_color_profile (image_ID);
 
-      if (gimp_color_profile_is_linear (profile))
+      /* If a profile is explicitly set, follow its TRC, whatever the
+       * storage format.
+       */
+      if (profile && gimp_color_profile_is_linear (profile))
+        out_linear = TRUE;
+
+      /* When no profile was explicitly set, since WebP is apparently
+       * 8-bit max, we export it as sRGB to avoid shadow posterization
+       * (we don't care about storage TRC).
+       * We do an exception for 8-bit linear work image to avoid
+       * conversion loss while the precision is the same.
+       */
+      if (! profile)
         {
-          if (gimp_image_get_precision (image_ID) != GIMP_PRECISION_U8_LINEAR)
-            {
-              /* If stored data was linear, let's convert the profile. */
-              GimpColorProfile *saved_profile;
+          /* There is always an effective profile. */
+          profile = gimp_image_get_effective_color_profile (image_ID);
 
-              saved_profile = gimp_color_profile_new_srgb_trc_from_color_profile (profile);
-              g_object_unref (profile);
-              profile = saved_profile;
-            }
-          else
+          if (gimp_color_profile_is_linear (profile))
             {
-              /* Keep linear profile as-is for 8-bit linear image. */
-              out_linear = TRUE;
+              if (gimp_image_get_precision (image_ID) != GIMP_PRECISION_U8_LINEAR)
+                {
+                  /* If stored data was linear, let's convert the profile. */
+                  GimpColorProfile *saved_profile;
+
+                  saved_profile = gimp_color_profile_new_srgb_trc_from_color_profile (profile);
+                  g_object_unref (profile);
+                  profile = saved_profile;
+                }
+              else
+                {
+                  /* Keep linear profile as-is for 8-bit linear image. */
+                  out_linear = TRUE;
+                }
             }
         }
     }
@@ -862,6 +865,11 @@ save_image (const gchar            *filename,
           metadata_flags &= ~GIMP_METADATA_SAVE_IPTC;
         }
 
+      if (params->profile)
+        metadata_flags |= GIMP_METADATA_SAVE_COLOR_PROFILE;
+      else
+        metadata_flags &= ~GIMP_METADATA_SAVE_COLOR_PROFILE;
+
       file = g_file_new_for_path (filename);
       gimp_image_metadata_save_finish (image_ID,
                                        "image/webp",
diff --git a/plug-ins/file-webp/file-webp-save.h b/plug-ins/file-webp/file-webp-save.h
index afd70a9749..b0b5a552be 100644
--- a/plug-ins/file-webp/file-webp-save.h
+++ b/plug-ins/file-webp/file-webp-save.h
@@ -36,6 +36,7 @@ typedef struct
   gboolean   exif;
   gboolean   iptc;
   gboolean   xmp;
+  gboolean   profile;
   gint       delay;
   gboolean   force_delay;
 } WebPSaveParams;
diff --git a/plug-ins/file-webp/file-webp.c b/plug-ins/file-webp/file-webp.c
index 2628beb9d6..7c9d627731 100644
--- a/plug-ins/file-webp/file-webp.c
+++ b/plug-ins/file-webp/file-webp.c
@@ -211,9 +211,10 @@ run (const gchar      *name,
           metadata = gimp_image_metadata_save_prepare (image_ID,
                                                        "image/webp",
                                                        &metadata_flags);
-          params.exif = (metadata_flags & GIMP_METADATA_SAVE_EXIF) != 0;
-          params.xmp  = (metadata_flags & GIMP_METADATA_SAVE_XMP) != 0;
-          params.iptc = (metadata_flags & GIMP_METADATA_SAVE_IPTC) != 0;
+          params.exif    = (metadata_flags & GIMP_METADATA_SAVE_EXIF) != 0;
+          params.xmp     = (metadata_flags & GIMP_METADATA_SAVE_XMP) != 0;
+          params.iptc    = (metadata_flags & GIMP_METADATA_SAVE_IPTC) != 0;
+          params.profile = (metadata_flags & GIMP_METADATA_SAVE_COLOR_PROFILE) != 0;
 
           /*  Possibly override with session data  */
           gimp_get_data (SAVE_PROC, &params);