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108 lines
4.3 KiB
C
108 lines
4.3 KiB
C
/* GDK - The GIMP Drawing Kit
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*
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* Copyright (C) 2021 Benjamin Otte
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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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#pragma once
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#include <gdk/gdktypes.h>
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#include <gdk/gdkcolorstate.h>
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#include <gdk/gdkrgba.h>
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#include <gdk/gdkmemoryformatprivate.h>
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typedef struct _GdkColor GdkColor;
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/* The interpretation of the first 3 components depends on the color state.
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* values[3] is always alpha.
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*/
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struct _GdkColor
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{
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GdkColorState *color_state;
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union {
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float values[4];
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struct {
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float r;
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float g;
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float b;
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float a;
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};
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struct {
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float red;
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float green;
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float blue;
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float alpha;
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};
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};
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};
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G_STATIC_ASSERT (G_STRUCT_OFFSET (GdkColor, r) == G_STRUCT_OFFSET (GdkColor, red));
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G_STATIC_ASSERT (G_STRUCT_OFFSET (GdkColor, g) == G_STRUCT_OFFSET (GdkColor, green));
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G_STATIC_ASSERT (G_STRUCT_OFFSET (GdkColor, b) == G_STRUCT_OFFSET (GdkColor, blue));
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G_STATIC_ASSERT (G_STRUCT_OFFSET (GdkColor, a) == G_STRUCT_OFFSET (GdkColor, alpha));
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/* The committee notes that since all known implementations but one "get it right"
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* this may well not be a defect at all.
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* https://open-std.org/JTC1/SC22/WG14/www/docs/n2396.htm#dr_496
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*/
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#ifndef _MSC_VER
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G_STATIC_ASSERT (G_STRUCT_OFFSET (GdkColor, r) == G_STRUCT_OFFSET (GdkColor, values[0]));
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G_STATIC_ASSERT (G_STRUCT_OFFSET (GdkColor, g) == G_STRUCT_OFFSET (GdkColor, values[1]));
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G_STATIC_ASSERT (G_STRUCT_OFFSET (GdkColor, b) == G_STRUCT_OFFSET (GdkColor, values[2]));
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G_STATIC_ASSERT (G_STRUCT_OFFSET (GdkColor, a) == G_STRUCT_OFFSET (GdkColor, values[3]));
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#endif
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#define GDK_COLOR_INIT_SRGB(r,g,b,a) { \
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.color_state = GDK_COLOR_STATE_SRGB, \
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.values = { (r), (g), (b), (a) } \
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}
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void gdk_color_init (GdkColor *self,
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GdkColorState *color_state,
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const float values[4]);
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void gdk_color_init_copy (GdkColor *self,
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const GdkColor *color);
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void gdk_color_init_from_rgba (GdkColor *self,
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const GdkRGBA *rgba);
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void gdk_color_finish (GdkColor *self);
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gboolean gdk_color_equal (const GdkColor *color1,
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const GdkColor *color2);
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gboolean gdk_color_is_clear (const GdkColor *self);
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gboolean gdk_color_is_opaque (const GdkColor *self);
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GdkMemoryDepth gdk_color_get_depth (const GdkColor *self);
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void gdk_color_convert (GdkColor *self,
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GdkColorState *color_state,
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const GdkColor *other);
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void gdk_color_to_float (const GdkColor *self,
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GdkColorState *target,
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float values[4]);
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void gdk_color_from_rgba (GdkColor *self,
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GdkColorState *color_state,
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const GdkRGBA *rgba);
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void gdk_color_print (const GdkColor *self,
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GString *string);
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char * gdk_color_to_string (const GdkColor *self);
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#include "gdkcolorimpl.h"
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G_END_DECLS
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