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https://gitlab.gnome.org/GNOME/gtk.git
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03ef6a7719
Converting to and from xyz turns out to be more difficult than expected, depending on what whitepoint you choose, And different specs choose different whitepoints, so we can't directly map css xyz to cicp xyz anyway.
775 lines
21 KiB
C
775 lines
21 KiB
C
/* gdkcolorstate.c
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*
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* Copyright 2024 Matthias Clasen
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gdkcolorstateprivate.h"
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#include <math.h>
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#include "gdkcolordefs.h"
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#include <glib/gi18n-lib.h>
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/**
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* GdkColorState:
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*
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* A `GdkColorState` object provides the information to interpret
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* colors and pixels in a variety of ways.
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*
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* They are also known as
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* [*color spaces*](https://en.wikipedia.org/wiki/Color_space).
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*
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* Crucially, GTK knows how to convert colors from one color
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* state to another.
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*
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* `GdkColorState objects are immutable and therefore threadsafe.
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*
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* Since 4.16
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*/
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G_DEFINE_BOXED_TYPE (GdkColorState, gdk_color_state,
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gdk_color_state_ref, gdk_color_state_unref);
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/* {{{ Public API */
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/**
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* gdk_color_state_ref:
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* @self: a `GdkColorState`
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*
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* Increase the reference count of @self.
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*
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* Returns: the object that was passed in
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*
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* Since: 4.16
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*/
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GdkColorState *
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(gdk_color_state_ref) (GdkColorState *self)
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{
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return _gdk_color_state_ref (self);
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}
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/**
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* gdk_color_state_unref:
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* @self:a `GdkColorState`
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*
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* Decrease the reference count of @self.
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*
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* Unless @self is static, it will be freed
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* when the reference count reaches zero.
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*
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* Since: 4.16
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*/
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void
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(gdk_color_state_unref) (GdkColorState *self)
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{
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_gdk_color_state_unref (self);
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}
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/**
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* gdk_color_state_get_srgb:
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*
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* Returns the color state object representing the sRGB color space.
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*
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* This color state uses the primaries defined by BT.709-6 and the transfer function
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* defined by IEC 61966-2-1.
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*
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* It is equivalent to the [Cicp](class.CicpParams.html) tuple 1/13/0/1.
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*
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* See e.g. [the CSS Color Module](https://www.w3.org/TR/css-color-4/#predefined-sRGB)
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* for details about this colorstate.
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*
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* Returns: the color state object for sRGB
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*
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* Since: 4.16
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*/
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GdkColorState *
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gdk_color_state_get_srgb (void)
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{
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return GDK_COLOR_STATE_SRGB;
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}
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/**
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* gdk_color_state_get_srgb_linear:
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*
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* Returns the color state object representing the linearized sRGB color space.
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*
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* This color state uses the primaries defined by BT.709-6 and a linear transfer function.
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*
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* It is equivalent to the [Cicp](class.CicpParams.html) tuple 1/8/0/1.
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*
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* See e.g. [the CSS Color Module](https://www.w3.org/TR/css-color-4/#predefined-sRGB-linear)
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* for details about this colorstate.
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*
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* Returns: the color state object for linearized sRGB
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*
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* Since: 4.16
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*/
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GdkColorState *
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gdk_color_state_get_srgb_linear (void)
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{
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return GDK_COLOR_STATE_SRGB_LINEAR;
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}
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/**
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* gdk_color_state_get_rec2100_pq:
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*
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* Returns the color state object representing the rec2100-pq color space.
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*
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* This color state uses the primaries defined by BT.2020-2 and BT.2100-0 and the transfer
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* function defined by SMPTE ST 2084 and BT.2100-2.
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*
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* It is equivalent to the [Cicp](class.CicpParams.html) tuple 9/16/0/1.
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*
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* See e.g. [the CSS HDR Module](https://drafts.csswg.org/css-color-hdr/#valdef-color-rec2100-pq)
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* for details about this colorstate.
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*
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* Returns: the color state object for rec2100-pq
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*
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* Since: 4.16
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*/
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GdkColorState *
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gdk_color_state_get_rec2100_pq (void)
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{
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return GDK_COLOR_STATE_REC2100_PQ;
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}
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/**
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* gdk_color_state_get_rec2100_linear:
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*
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* Returns the color state object representing the linear rec2100 color space.
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*
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* This color state uses the primaries defined by BT.2020-2 and BT.2100-0 and a linear
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* transfer function.
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*
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* It is equivalent to the [Cicp](class.CicpParams.html) tuple 9/8/0/1.
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*
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* See e.g. [the CSS HDR Module](https://drafts.csswg.org/css-color-hdr/#valdef-color-rec2100-linear)
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* for details about this colorstate.
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*
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* Returns: the color state object for linearized rec2100
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*
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* Since: 4.16
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*/
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GdkColorState *
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gdk_color_state_get_rec2100_linear (void)
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{
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return GDK_COLOR_STATE_REC2100_LINEAR;
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}
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/**
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* gdk_color_state_equal:
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* @self: a `GdkColorState`
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* @other: another `GdkColorStatee`
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*
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* Compares two `GdkColorStates` for equality.
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*
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* Note that this function is not guaranteed to be perfect and two objects
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* describing the same color state may compare not equal. However, different
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* color states will never compare equal.
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*
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* Returns: %TRUE if the two color states compare equal
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*
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* Since: 4.16
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*/
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gboolean
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(gdk_color_state_equal) (GdkColorState *self,
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GdkColorState *other)
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{
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return _gdk_color_state_equal (self, other);
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}
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/**
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* gdk_color_state_create_cicp_params:
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* @self: a `GdkColorState`
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*
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* Create a [class@Gdk.CicpParams] representing the colorstate.
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*
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* It is not guaranteed that every `GdkColorState` can be
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* represented with Cicp parameters. If that is the case,
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* this function returns `NULL`.
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*
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* Returns: (transfer full) (nullable): A new [class@Gdk.CicpParams]
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*
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* Since: 4.16
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*/
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GdkCicpParams *
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gdk_color_state_create_cicp_params (GdkColorState *self)
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{
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const GdkCicp *cicp = gdk_color_state_get_cicp (self);
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if (cicp)
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return gdk_cicp_params_new_for_cicp (cicp);
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return NULL;
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}
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/* }}} */
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/* {{{ Conversion functions */
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typedef float (* GdkTransferFunc) (float v);
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typedef const float GdkColorMatrix[9];
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#define IDENTITY ((float*)0)
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#define NONE ((GdkTransferFunc)0)
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#define TRANSFORM(name, eotf, matrix, oetf) \
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static void \
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name (GdkColorState *self, \
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float (*values)[4], \
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gsize n_values) \
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{ \
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for (gsize i = 0; i < n_values; i++) \
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{ \
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if (eotf != NONE) \
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{ \
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values[i][0] = eotf (values[i][0]); \
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values[i][1] = eotf (values[i][1]); \
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values[i][2] = eotf (values[i][2]); \
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} \
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if (matrix != IDENTITY) \
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{ \
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float res[3]; \
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res[0] = matrix[0] * values[i][0] + matrix[1] * values[i][1] + matrix[2] * values[i][2]; \
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res[1] = matrix[3] * values[i][0] + matrix[4] * values[i][1] + matrix[5] * values[i][2]; \
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res[2] = matrix[6] * values[i][0] + matrix[7] * values[i][1] + matrix[8] * values[i][2]; \
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values[i][0] = res[0]; \
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values[i][1] = res[1]; \
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values[i][2] = res[2]; \
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} \
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if (oetf != NONE) \
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{ \
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values[i][0] = oetf (values[i][0]); \
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values[i][1] = oetf (values[i][1]); \
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values[i][2] = oetf (values[i][2]); \
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} \
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} \
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}
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TRANSFORM(gdk_default_srgb_to_srgb_linear, srgb_eotf, IDENTITY, NONE);
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TRANSFORM(gdk_default_srgb_linear_to_srgb, NONE, IDENTITY, srgb_oetf)
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TRANSFORM(gdk_default_rec2100_pq_to_rec2100_linear, pq_eotf, IDENTITY, NONE)
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TRANSFORM(gdk_default_rec2100_linear_to_rec2100_pq, NONE, IDENTITY, pq_oetf)
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TRANSFORM(gdk_default_srgb_linear_to_rec2100_linear, NONE, srgb_to_rec2020, NONE)
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TRANSFORM(gdk_default_rec2100_linear_to_srgb_linear, NONE, rec2020_to_srgb, NONE)
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TRANSFORM(gdk_default_srgb_to_rec2100_linear, srgb_eotf, srgb_to_rec2020, NONE)
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TRANSFORM(gdk_default_rec2100_pq_to_srgb_linear, pq_eotf, rec2020_to_srgb, NONE)
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TRANSFORM(gdk_default_srgb_linear_to_rec2100_pq, NONE, srgb_to_rec2020, pq_oetf)
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TRANSFORM(gdk_default_rec2100_linear_to_srgb, NONE, rec2020_to_srgb, srgb_oetf)
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TRANSFORM(gdk_default_srgb_to_rec2100_pq, srgb_eotf, srgb_to_rec2020, pq_oetf)
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TRANSFORM(gdk_default_rec2100_pq_to_srgb, pq_eotf, rec2020_to_srgb, srgb_oetf)
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/* }}} */
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/* {{{ Default implementation */
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/* {{{ Vfuncs */
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static gboolean
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gdk_default_color_state_equal (GdkColorState *self,
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GdkColorState *other)
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{
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return self == other;
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}
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static const char *
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gdk_default_color_state_get_name (GdkColorState *color_state)
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{
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GdkDefaultColorState *self = (GdkDefaultColorState *) color_state;
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return self->name;
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}
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static GdkColorState *
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gdk_default_color_state_get_no_srgb_tf (GdkColorState *color_state)
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{
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GdkDefaultColorState *self = (GdkDefaultColorState *) color_state;
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return self->no_srgb;
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}
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static GdkFloatColorConvert
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gdk_default_color_state_get_convert_to (GdkColorState *color_state,
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GdkColorState *target)
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{
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GdkDefaultColorState *self = (GdkDefaultColorState *) color_state;
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if (GDK_IS_DEFAULT_COLOR_STATE (target))
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return self->convert_to[GDK_DEFAULT_COLOR_STATE_ID (target)];
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return NULL;
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}
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static GdkFloatColorConvert
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gdk_default_color_state_get_convert_from (GdkColorState *color_state,
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GdkColorState *source)
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{
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/* This is ok because the default-to-default conversion functions
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* don't use the passed colorstate at all.
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*/
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return gdk_default_color_state_get_convert_to (source, color_state);
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}
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static const GdkCicp *
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gdk_default_color_state_get_cicp (GdkColorState *color_state)
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{
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GdkDefaultColorState *self = (GdkDefaultColorState *) color_state;
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return &self->cicp;
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}
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/* }}} */
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static const
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GdkColorStateClass GDK_DEFAULT_COLOR_STATE_CLASS = {
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.free = NULL, /* crash here if this ever happens */
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.equal = gdk_default_color_state_equal,
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.get_name = gdk_default_color_state_get_name,
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.get_no_srgb_tf = gdk_default_color_state_get_no_srgb_tf,
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.get_convert_to = gdk_default_color_state_get_convert_to,
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.get_convert_from = gdk_default_color_state_get_convert_from,
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.get_cicp = gdk_default_color_state_get_cicp,
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};
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GdkDefaultColorState gdk_default_color_states[] = {
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[GDK_COLOR_STATE_ID_SRGB] = {
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.parent = {
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.klass = &GDK_DEFAULT_COLOR_STATE_CLASS,
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.ref_count = 0,
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.depth = GDK_MEMORY_U8_SRGB,
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.rendering_color_state = GDK_COLOR_STATE_SRGB_LINEAR,
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},
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.name = "srgb",
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.no_srgb = GDK_COLOR_STATE_SRGB_LINEAR,
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.convert_to = {
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[GDK_COLOR_STATE_ID_SRGB_LINEAR] = gdk_default_srgb_to_srgb_linear,
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[GDK_COLOR_STATE_ID_REC2100_PQ] = gdk_default_srgb_to_rec2100_pq,
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[GDK_COLOR_STATE_ID_REC2100_LINEAR] = gdk_default_srgb_to_rec2100_linear,
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},
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.cicp = { 1, 13, 0, 1 },
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},
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[GDK_COLOR_STATE_ID_SRGB_LINEAR] = {
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.parent = {
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.klass = &GDK_DEFAULT_COLOR_STATE_CLASS,
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.ref_count = 0,
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.depth = GDK_MEMORY_U8,
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.rendering_color_state = GDK_COLOR_STATE_SRGB_LINEAR,
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},
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.name = "srgb-linear",
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.no_srgb = NULL,
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.convert_to = {
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[GDK_COLOR_STATE_ID_SRGB] = gdk_default_srgb_linear_to_srgb,
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[GDK_COLOR_STATE_ID_REC2100_PQ] = gdk_default_srgb_linear_to_rec2100_pq,
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[GDK_COLOR_STATE_ID_REC2100_LINEAR] = gdk_default_srgb_linear_to_rec2100_linear,
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},
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.cicp = { 1, 8, 0, 1 },
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},
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[GDK_COLOR_STATE_ID_REC2100_PQ] = {
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.parent = {
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.klass = &GDK_DEFAULT_COLOR_STATE_CLASS,
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.ref_count = 0,
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.depth = GDK_MEMORY_FLOAT16,
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.rendering_color_state = GDK_COLOR_STATE_REC2100_LINEAR,
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},
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.name = "rec2100-pq",
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.no_srgb = NULL,
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.convert_to = {
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[GDK_COLOR_STATE_ID_SRGB] = gdk_default_rec2100_pq_to_srgb,
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[GDK_COLOR_STATE_ID_SRGB_LINEAR] = gdk_default_rec2100_pq_to_srgb_linear,
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[GDK_COLOR_STATE_ID_REC2100_LINEAR] = gdk_default_rec2100_pq_to_rec2100_linear,
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},
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.cicp = { 9, 16, 0, 1 },
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},
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[GDK_COLOR_STATE_ID_REC2100_LINEAR] = {
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.parent = {
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.klass = &GDK_DEFAULT_COLOR_STATE_CLASS,
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.ref_count = 0,
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.depth = GDK_MEMORY_FLOAT16,
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.rendering_color_state = GDK_COLOR_STATE_REC2100_LINEAR,
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},
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.name = "rec2100-linear",
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.no_srgb = NULL,
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.convert_to = {
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[GDK_COLOR_STATE_ID_SRGB] = gdk_default_rec2100_linear_to_srgb,
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[GDK_COLOR_STATE_ID_SRGB_LINEAR] = gdk_default_rec2100_linear_to_srgb_linear,
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[GDK_COLOR_STATE_ID_REC2100_PQ] = gdk_default_rec2100_linear_to_rec2100_pq,
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},
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.cicp = { 9, 8, 0, 1 },
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},
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};
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/* }}} */
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/* {{{ Cicp implementation */
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typedef struct _GdkCicpColorState GdkCicpColorState;
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struct _GdkCicpColorState
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{
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GdkColorState parent;
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GdkColorState *no_srgb;
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const char *name;
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GdkTransferFunc eotf;
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GdkTransferFunc oetf;
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float *to_srgb;
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float *to_rec2020;
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float *from_srgb;
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float *from_rec2020;
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GdkCicp cicp;
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};
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/* {{{ Conversion functions */
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#define cicp ((GdkCicpColorState *)self)
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TRANSFORM(gdk_cicp_to_srgb, cicp->eotf, cicp->to_srgb, srgb_oetf)
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TRANSFORM(gdk_cicp_to_srgb_linear, cicp->eotf, cicp->to_srgb, NONE)
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TRANSFORM(gdk_cicp_to_rec2100_pq, cicp->eotf, cicp->to_rec2020, pq_oetf)
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TRANSFORM(gdk_cicp_to_rec2100_linear, cicp->eotf, cicp->to_rec2020, NONE)
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TRANSFORM(gdk_cicp_from_srgb, srgb_eotf, cicp->from_srgb, cicp->oetf)
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TRANSFORM(gdk_cicp_from_srgb_linear, NONE, cicp->from_srgb, cicp->oetf)
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TRANSFORM(gdk_cicp_from_rec2100_pq, pq_eotf, cicp->from_rec2020, cicp->oetf)
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TRANSFORM(gdk_cicp_from_rec2100_linear, NONE, cicp->from_rec2020, cicp->oetf)
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#undef cicp
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/* }}} */
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/* }}} */
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/* {{{ Vfuncs */
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static void
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gdk_cicp_color_state_free (GdkColorState *cs)
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{
|
|
GdkCicpColorState *self = (GdkCicpColorState *) cs;
|
|
|
|
if (self->no_srgb)
|
|
gdk_color_state_unref (self->no_srgb);
|
|
|
|
g_free (self->to_srgb);
|
|
g_free (self->to_rec2020);
|
|
g_free (self->from_srgb);
|
|
g_free (self->from_rec2020);
|
|
|
|
g_free (self);
|
|
}
|
|
|
|
static gboolean
|
|
gdk_cicp_color_state_equal (GdkColorState *self,
|
|
GdkColorState *other)
|
|
{
|
|
GdkCicpColorState *cs1 = (GdkCicpColorState *) self;
|
|
GdkCicpColorState *cs2 = (GdkCicpColorState *) other;
|
|
|
|
return gdk_cicp_equal (&cs1->cicp, &cs2->cicp);
|
|
}
|
|
|
|
static const char *
|
|
gdk_cicp_color_state_get_name (GdkColorState *self)
|
|
{
|
|
GdkCicpColorState *cs = (GdkCicpColorState *) self;
|
|
|
|
return cs->name;
|
|
}
|
|
|
|
static GdkColorState *
|
|
gdk_cicp_color_state_get_no_srgb_tf (GdkColorState *self)
|
|
{
|
|
GdkCicpColorState *cs = (GdkCicpColorState *) self;
|
|
|
|
return cs->no_srgb;
|
|
}
|
|
|
|
static GdkFloatColorConvert
|
|
gdk_cicp_color_state_get_convert_to (GdkColorState *self,
|
|
GdkColorState *target)
|
|
{
|
|
if (!GDK_IS_DEFAULT_COLOR_STATE (target))
|
|
return NULL;
|
|
|
|
switch (GDK_DEFAULT_COLOR_STATE_ID (target))
|
|
{
|
|
case GDK_COLOR_STATE_ID_SRGB:
|
|
return gdk_cicp_to_srgb;
|
|
case GDK_COLOR_STATE_ID_SRGB_LINEAR:
|
|
return gdk_cicp_to_srgb_linear;
|
|
case GDK_COLOR_STATE_ID_REC2100_PQ:
|
|
return gdk_cicp_to_rec2100_pq;
|
|
case GDK_COLOR_STATE_ID_REC2100_LINEAR:
|
|
return gdk_cicp_to_rec2100_linear;
|
|
|
|
case GDK_COLOR_STATE_N_IDS:
|
|
default:
|
|
g_assert_not_reached ();
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static GdkFloatColorConvert
|
|
gdk_cicp_color_state_get_convert_from (GdkColorState *self,
|
|
GdkColorState *source)
|
|
{
|
|
if (!GDK_IS_DEFAULT_COLOR_STATE (source))
|
|
return NULL;
|
|
|
|
switch (GDK_DEFAULT_COLOR_STATE_ID (source))
|
|
{
|
|
case GDK_COLOR_STATE_ID_SRGB:
|
|
return gdk_cicp_from_srgb;
|
|
case GDK_COLOR_STATE_ID_SRGB_LINEAR:
|
|
return gdk_cicp_from_srgb_linear;
|
|
case GDK_COLOR_STATE_ID_REC2100_PQ:
|
|
return gdk_cicp_from_rec2100_pq;
|
|
case GDK_COLOR_STATE_ID_REC2100_LINEAR:
|
|
return gdk_cicp_from_rec2100_linear;
|
|
|
|
case GDK_COLOR_STATE_N_IDS:
|
|
default:
|
|
g_assert_not_reached ();
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static const GdkCicp *
|
|
gdk_cicp_color_state_get_cicp (GdkColorState *color_state)
|
|
{
|
|
GdkCicpColorState *self = (GdkCicpColorState *) color_state;
|
|
|
|
return &self->cicp;
|
|
}
|
|
|
|
/* }}} */
|
|
|
|
static const
|
|
GdkColorStateClass GDK_CICP_COLOR_STATE_CLASS = {
|
|
.free = gdk_cicp_color_state_free,
|
|
.equal = gdk_cicp_color_state_equal,
|
|
.get_name = gdk_cicp_color_state_get_name,
|
|
.get_no_srgb_tf = gdk_cicp_color_state_get_no_srgb_tf,
|
|
.get_convert_to = gdk_cicp_color_state_get_convert_to,
|
|
.get_convert_from = gdk_cicp_color_state_get_convert_from,
|
|
.get_cicp = gdk_cicp_color_state_get_cicp,
|
|
};
|
|
|
|
static inline float *
|
|
multiply (float res[9],
|
|
const float m1[9],
|
|
const float m2[9])
|
|
{
|
|
#define IDX(i,j) 3*i+j
|
|
for (int i = 0; i < 3; i++)
|
|
for (int j = 0; j < 3; j++)
|
|
res[IDX(i,j)] = m1[IDX(i,0)] * m2[IDX(0,j)]
|
|
+ m1[IDX(i,1)] * m2[IDX(1,j)]
|
|
+ m1[IDX(i,2)] * m2[IDX(2,j)];
|
|
|
|
return res;
|
|
}
|
|
|
|
GdkColorState *
|
|
gdk_color_state_new_for_cicp (const GdkCicp *cicp,
|
|
GError **error)
|
|
{
|
|
GdkCicpColorState *self;
|
|
GdkTransferFunc eotf;
|
|
GdkTransferFunc oetf;
|
|
gconstpointer to_xyz;
|
|
gconstpointer from_xyz;
|
|
|
|
if (cicp->range == GDK_CICP_RANGE_NARROW || cicp->matrix_coefficients != 0)
|
|
{
|
|
g_set_error (error,
|
|
G_IO_ERROR, G_IO_ERROR_FAILED,
|
|
_("cicp: Narrow range or YUV not supported"));
|
|
return NULL;
|
|
}
|
|
|
|
if (cicp->color_primaries == 2 ||
|
|
cicp->transfer_function == 2 ||
|
|
cicp->matrix_coefficients == 2)
|
|
{
|
|
g_set_error (error,
|
|
G_IO_ERROR, G_IO_ERROR_FAILED,
|
|
_("cicp: Unspecified parameters not supported"));
|
|
return NULL;
|
|
}
|
|
|
|
for (guint i = 0; i < GDK_COLOR_STATE_N_IDS; i++)
|
|
{
|
|
if (gdk_cicp_equivalent (cicp, &gdk_default_color_states[i].cicp))
|
|
return (GdkColorState *) &gdk_default_color_states[i];
|
|
}
|
|
|
|
switch (cicp->transfer_function)
|
|
{
|
|
case 1:
|
|
case 6:
|
|
case 14:
|
|
case 15:
|
|
eotf = bt709_eotf;
|
|
oetf = bt709_oetf;
|
|
break;
|
|
case 4:
|
|
eotf = gamma22_eotf;
|
|
oetf = gamma22_oetf;
|
|
break;
|
|
case 5:
|
|
eotf = gamma28_eotf;
|
|
oetf = gamma28_oetf;
|
|
break;
|
|
case 8:
|
|
eotf = NONE;
|
|
oetf = NONE;
|
|
break;
|
|
case 13:
|
|
eotf = srgb_eotf;
|
|
oetf = srgb_oetf;
|
|
break;
|
|
case 16:
|
|
eotf = pq_eotf;
|
|
oetf = pq_oetf;
|
|
break;
|
|
case 18:
|
|
eotf = hlg_eotf;
|
|
oetf = hlg_oetf;
|
|
break;
|
|
default:
|
|
g_set_error (error,
|
|
G_IO_ERROR, G_IO_ERROR_FAILED,
|
|
_("cicp: Transfer function %u not supported"),
|
|
cicp->transfer_function);
|
|
return NULL;
|
|
}
|
|
|
|
switch (cicp->color_primaries)
|
|
{
|
|
case 1:
|
|
to_xyz = srgb_to_xyz;
|
|
from_xyz = xyz_to_srgb;
|
|
break;
|
|
case 5:
|
|
to_xyz = pal_to_xyz;
|
|
from_xyz = xyz_to_pal;
|
|
break;
|
|
case 6:
|
|
to_xyz = ntsc_to_xyz;
|
|
from_xyz = xyz_to_ntsc;
|
|
break;
|
|
case 9:
|
|
to_xyz = rec2020_to_xyz;
|
|
from_xyz = xyz_to_rec2020;
|
|
break;
|
|
case 12:
|
|
to_xyz = p3_to_xyz;
|
|
from_xyz = xyz_to_p3;
|
|
break;
|
|
default:
|
|
g_set_error (error,
|
|
G_IO_ERROR, G_IO_ERROR_FAILED,
|
|
_("cicp: Color primaries %u not supported"),
|
|
cicp->color_primaries);
|
|
return NULL;
|
|
}
|
|
|
|
self = g_new0 (GdkCicpColorState, 1);
|
|
|
|
self->parent.klass = &GDK_CICP_COLOR_STATE_CLASS;
|
|
self->parent.ref_count = 1;
|
|
|
|
/* sRGB is special-cased by being a default colorstate */
|
|
self->parent.rendering_color_state = GDK_COLOR_STATE_REC2100_LINEAR;
|
|
|
|
self->parent.depth = GDK_MEMORY_FLOAT16;
|
|
|
|
memcpy (&self->cicp, cicp, sizeof (GdkCicp));
|
|
|
|
self->eotf = eotf;
|
|
self->oetf = oetf;
|
|
|
|
self->to_srgb = multiply (g_new (float, 9), xyz_to_srgb, to_xyz);
|
|
self->to_rec2020 = multiply (g_new (float, 9), xyz_to_rec2020, to_xyz);
|
|
self->from_srgb = multiply (g_new (float, 9), from_xyz, srgb_to_xyz);
|
|
self->from_rec2020 = multiply (g_new (float, 9), from_xyz, rec2020_to_xyz);
|
|
|
|
self->name = g_strdup_printf ("cicp-%u/%u/%u/%u",
|
|
cicp->color_primaries,
|
|
cicp->transfer_function,
|
|
cicp->matrix_coefficients,
|
|
cicp->range);
|
|
|
|
if (cicp->transfer_function == 13)
|
|
{
|
|
GdkCicp no_srgb;
|
|
|
|
memcpy (&no_srgb, cicp, sizeof (GdkCicp));
|
|
no_srgb.transfer_function = 8;
|
|
|
|
self->no_srgb = gdk_color_state_new_for_cicp (&no_srgb, NULL);
|
|
}
|
|
|
|
return (GdkColorState *) self;
|
|
}
|
|
|
|
/* }}} */
|
|
/* {{{ Private API */
|
|
|
|
/*<private>
|
|
* gdk_color_state_get_name:
|
|
* @self: a colorstate
|
|
*
|
|
* Returns the name of @self.
|
|
*
|
|
* This is *not* a translated, user-visible string.
|
|
*
|
|
* Returns: (transfer none): a name for representing the color state
|
|
* in diagnostic output
|
|
*/
|
|
const char *
|
|
gdk_color_state_get_name (GdkColorState *self)
|
|
{
|
|
return self->klass->get_name (self);
|
|
}
|
|
|
|
/*<private>
|
|
* gdk_color_state_get_no_srgb_tf:
|
|
* @self: a colorstate
|
|
*
|
|
* This function checks if the colorstate uses an sRGB transfer function
|
|
* as final operation. In that case, it is suitable for use with GL_SRGB
|
|
* (and the Vulkan equivalents).
|
|
*
|
|
* If it is suitable, the colorstate without the transfer function is
|
|
* returned. Otherwise, this function returns NULL.
|
|
*
|
|
* Returns: (transfer none): the colorstate without sRGB transfer function.
|
|
**/
|
|
GdkColorState *
|
|
gdk_color_state_get_no_srgb_tf (GdkColorState *self)
|
|
{
|
|
if (!GDK_DEBUG_CHECK (LINEAR))
|
|
return FALSE;
|
|
|
|
return self->klass->get_no_srgb_tf (self);
|
|
}
|
|
|
|
/* }}} */
|
|
|
|
/* vim:set foldmethod=marker expandtab: */
|