framework/delibs/deimage/deARGB.h

#ifndef _DEARGB_H
#define _DEARGB_H
/*-------------------------------------------------------------------------
 * drawElements Image Library
 * --------------------------
 *
 * Copyright 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *//*!
 * \file
 * \brief Image library.
 *//*--------------------------------------------------------------------*/

#include "deDefs.h"
#include "deInt32.h"

/* ARGB color in descending A, R, G, B order (alpha is in most significant byte). */
typedef deUint32 deARGB;

DE_INLINE deARGB	deARGB_set (int r, int g, int b, int a)
{
	DE_ASSERT(deInBounds32(r, 0, 256));
	DE_ASSERT(deInBounds32(g, 0, 256));
	DE_ASSERT(deInBounds32(b, 0, 256));
	DE_ASSERT(deInBounds32(a, 0, 256));
	return (a<<24) | (r<<16) | (g<<8) | (b<<0);
}

DE_INLINE deARGB	deARGB_white		(void)			{ return deARGB_set(0xFF, 0xFF, 0xFF, 0xFF); }
DE_INLINE deARGB	deARGB_black		(void)			{ return deARGB_set(0, 0, 0, 0xFF); }

DE_INLINE int		deARGB_getRed		(deARGB argb)	{ return (int)((argb >> 16) & 0xFF); }
DE_INLINE int		deARGB_getGreen		(deARGB argb)	{ return (int)((argb >>  8) & 0xFF); }
DE_INLINE int		deARGB_getBlue		(deARGB argb)	{ return (int)((argb >>  0) & 0xFF); }
DE_INLINE int		deARGB_getAlpha		(deARGB argb)	{ return (int)((argb >> 24) & 0xFF); }

DE_INLINE deARGB deARGB_multiply (deARGB argb, int f)
{
	DE_ASSERT(deInRange32(f, 0, 256));
	{
		int r = (deARGB_getRed(argb) * f + 128) >> 8;
		int g = (deARGB_getGreen(argb) * f + 128) >> 8;
		int b = (deARGB_getBlue(argb) * f + 128) >> 8;
		int a = (deARGB_getAlpha(argb) * f + 128) >> 8;
		return deARGB_set(r, g, b, a);
	}
}

DE_INLINE deARGB deARGB_add (deARGB a, deARGB b)
{
	return deARGB_set(deClamp32(deARGB_getRed(a)   + deARGB_getRed(b),   0, 255),
					  deClamp32(deARGB_getGreen(a) + deARGB_getGreen(b), 0, 255),
					  deClamp32(deARGB_getBlue(a)  + deARGB_getBlue(b),  0, 255),
					  deClamp32(deARGB_getAlpha(a) + deARGB_getAlpha(b), 0, 255));
}

#endif /* _DEARGB_H */