[gtk/wip/otte/color-profiles: 63/82] gdk: Add srgb_linear color profile
- From: Benjamin Otte <otte src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk/wip/otte/color-profiles: 63/82] gdk: Add srgb_linear color profile
- Date: Wed, 6 Oct 2021 02:13:01 +0000 (UTC)
commit 60ebac2c7169b2862db22d241ad1207aa5d61b02
Author: Benjamin Otte <otte redhat com>
Date: Sun Sep 26 02:42:40 2021 +0200
gdk: Add srgb_linear color profile
... and gdk_color_profile_is_linear()
gdk/gdkcolorprofile.c | 69 ++++++++++++++++++++++++++++++++++++++++++++
gdk/gdkcolorprofile.h | 2 ++
gdk/gdkcolorprofileprivate.h | 2 ++
3 files changed, 73 insertions(+)
---
diff --git a/gdk/gdkcolorprofile.c b/gdk/gdkcolorprofile.c
index d0b06d4071..6722b44b6f 100644
--- a/gdk/gdkcolorprofile.c
+++ b/gdk/gdkcolorprofile.c
@@ -214,6 +214,49 @@ gdk_color_profile_get_srgb (void)
return srgb_profile;
}
+/*<private>
+ * gdk_color_profile_get_srgb_linear:
+ *
+ * Returns the linear color profile corresponding to the sRGB
+ * color space.
+ *
+ * It can display the same colors, but it does not have a gamma curve.
+ *
+ * Returns: (transfer none): the color profile for the linear sRGB
+ * color space.
+ */
+GdkColorProfile *
+gdk_color_profile_get_srgb_linear (void)
+{
+ static GdkColorProfile *srgb_linear_profile;
+
+ if (g_once_init_enter (&srgb_linear_profile))
+ {
+ cmsToneCurve *curve;
+ cmsHPROFILE lcms_profile;
+ GdkColorProfile *new_profile;
+
+ curve = cmsBuildGamma (NULL, 1.0);
+ lcms_profile = cmsCreateRGBProfile (&(cmsCIExyY) {
+ 0.3127, 0.3290, 1.0
+ },
+ &(cmsCIExyYTRIPLE) {
+ { 0.6400, 0.3300, 1.0 },
+ { 0.3000, 0.6000, 1.0 },
+ { 0.1500, 0.0600, 1.0 }
+ },
+ (cmsToneCurve*[3]) { curve, curve, curve });
+ cmsFreeToneCurve (curve);
+
+ new_profile = gdk_color_profile_new_from_lcms_profile (lcms_profile, NULL);
+ g_assert (new_profile);
+
+ g_once_init_leave (&srgb_linear_profile, new_profile);
+ }
+
+ return srgb_linear_profile;
+}
+
/**
* gdk_color_profile_new_from_icc_bytes:
* @icc_profile: The ICC profiles given as a `GBytes`
@@ -298,6 +341,32 @@ gdk_color_profile_get_lcms_profile (GdkColorProfile *self)
return self->lcms_profile;
}
+/**
+ * gdk_color_profile_is_linear:
+ * @profile: a `GdkColorProfile`
+ *
+ * Checks if the given profile is linear.
+ * GTK tries to do compositing in a linear profile.
+ *
+ * Some profiles may be linear, but it is not possible to
+ * determine this easily. In those cases %FALSE will be returned.
+ *
+ * Returns: %TRUE if the profile can be proven linear
+ *
+ * Since: 4.6
+ */
+gboolean
+gdk_color_profile_is_linear (GdkColorProfile *self)
+{
+ g_return_val_if_fail (GDK_IS_COLOR_PROFILE (self), FALSE);
+
+ /* FIXME: Make this useful */
+ if (self == gdk_color_profile_get_srgb_linear ())
+ return TRUE;
+
+ return FALSE;
+}
+
/**
* gdk_color_profile_equal:
* @profile1: (type GdkColorProfile): a `GdkColorProfile`
diff --git a/gdk/gdkcolorprofile.h b/gdk/gdkcolorprofile.h
index 66cb59dab1..189363f7f2 100644
--- a/gdk/gdkcolorprofile.h
+++ b/gdk/gdkcolorprofile.h
@@ -54,6 +54,8 @@ GdkColorProfile * gdk_color_profile_new_from_icc_bytes (GByte
GDK_AVAILABLE_IN_4_6
GBytes * gdk_color_profile_get_icc_profile (GdkColorProfile *self);
+GDK_AVAILABLE_IN_4_6
+gboolean gdk_color_profile_is_linear (GdkColorProfile *self)
G_GNUC_PURE;
GDK_AVAILABLE_IN_4_6
gboolean gdk_color_profile_equal (gconstpointer profile1,
gconstpointer profile2);
diff --git a/gdk/gdkcolorprofileprivate.h b/gdk/gdkcolorprofileprivate.h
index 48bf6fd3e1..16a02196ed 100644
--- a/gdk/gdkcolorprofileprivate.h
+++ b/gdk/gdkcolorprofileprivate.h
@@ -7,6 +7,8 @@
G_BEGIN_DECLS
+GdkColorProfile * gdk_color_profile_get_srgb_linear (void) G_GNUC_CONST;
+
GdkColorProfile * gdk_color_profile_new_from_lcms_profile (cmsHPROFILE
lcms_profile,
GError **error);
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