jpeg reader: use the sRGB profile if the ColorSpace tag is set to sRGB

extensions/cairo_io/cairo-image-surface-jpeg.c

@@ -200,7 +200,7 @@ _cairo_image_surface_create_from_jpeg (GInputStream  *istream,
 	_jpeg_info_data_init (&jpeg_info);
 	info_flags = _JPEG_INFO_EXIF_ORIENTATION;
 #if HAVE_LCMS2
-	info_flags |= _JPEG_INFO_ICC_PROFILE;
+	info_flags |= _JPEG_INFO_EXIF_COLOR_SPACE | _JPEG_INFO_ICC_PROFILE;
 #endif
 	_jpeg_info_get_from_buffer (in_buffer, in_buffer_size, info_flags, &jpeg_info);
 	if (jpeg_info.valid & _JPEG_INFO_EXIF_ORIENTATION)
@@ -208,10 +208,21 @@ _cairo_image_surface_create_from_jpeg (GInputStream  *istream,
 	else
 		orientation = GTH_TRANSFORM_NONE;
 #if HAVE_LCMS2
-	if (jpeg_info.valid & _JPEG_INFO_ICC_PROFILE) {
-		GthICCProfile *profile = gth_icc_profile_new (GTH_ICC_PROFILE_ID_UNKNOWN, cmsOpenProfileFromMem (jpeg_info.icc_data, jpeg_info.icc_data_size));
-		gth_image_set_icc_profile (image, profile);
-		g_object_unref (profile);
+	{
+		GthICCProfile *profile = NULL;
+
+		if (jpeg_info.valid & _JPEG_INFO_ICC_PROFILE) {
+			profile = gth_icc_profile_new (GTH_ICC_PROFILE_ID_UNKNOWN, cmsOpenProfileFromMem (jpeg_info.icc_data, jpeg_info.icc_data_size));
+		}
+		else if (jpeg_info.valid & _JPEG_INFO_EXIF_COLOR_SPACE) {
+			if (jpeg_info.color_space == GTH_COLOR_SPACE_SRGB)
+				profile = gth_icc_profile_new_srgb ();
+		}
+
+		if (profile != NULL) {
+			gth_image_set_icc_profile (image, profile);
+			g_object_unref (profile);
+		}
 	}
 #endif
 	_jpeg_info_data_dispose (&jpeg_info);

gthumb/gth-icc-profile.c

@@ -169,6 +169,31 @@ gth_icc_profile_new (const char    *id,
 }
 
 
+GthICCProfile *
+gth_icc_profile_new_srgb (void)
+{
+#ifdef HAVE_LCMS2
+
+	char          *id;
+	GthCMSProfile  cmd_profile;
+	GthICCProfile *icc_profile;
+
+	id = g_strdup ("standard://srgb");
+	cmd_profile = (GthCMSProfile) cmsCreate_sRGBProfile ();
+	icc_profile = gth_icc_profile_new (id, cmd_profile);
+
+	g_free (id);
+
+	return icc_profile;
+
+#else
+
+	return NULL;
+
+#endif
+}
+
+
 const char *
 gth_icc_profile_get_id (GthICCProfile *self)
 {

gthumb/gth-icc-profile.h

@@ -79,6 +79,7 @@ void			gth_cms_transform_free		(GthCMSTransform  transform);
 GType			gth_icc_profile_get_type	(void);
 GthICCProfile *		gth_icc_profile_new		(const char	 *id,
 						 	 GthCMSProfile	  profile);
+GthICCProfile *		gth_icc_profile_new_srgb	(void);
 const char *		gth_icc_profile_get_id		(GthICCProfile	 *icc_profile);
 gboolean                gth_icc_profile_id_is_unknown   (const char      *id);
 GthCMSProfile		gth_icc_profile_get_profile	(GthICCProfile	 *icc_profile);