1/*
2Open Tracker License
3
4Terms and Conditions
5
6Copyright (c) 1991-2000, Be Incorporated. All rights reserved.
7
8Permission is hereby granted, free of charge, to any person obtaining a copy of
9this software and associated documentation files (the "Software"), to deal in
10the Software without restriction, including without limitation the rights to
11use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
12of the Software, and to permit persons to whom the Software is furnished to do
13so, subject to the following conditions:
14
15The above copyright notice and this permission notice applies to all licensees
16and shall be included in all copies or substantial portions of the Software.
17
18THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF TITLE, MERCHANTABILITY,
20FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21BE INCORPORATED BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF, OR IN CONNECTION
23WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24
25Except as contained in this notice, the name of Be Incorporated shall not be
26used in advertising or otherwise to promote the sale, use or other dealings in
27this Software without prior written authorization from Be Incorporated.
28
29Tracker(TM), Be(R), BeOS(R), and BeIA(TM) are trademarks or registered trademarks
30of Be Incorporated in the United States and other countries. Other brand product
31names are registered trademarks or trademarks of their respective holders.
32All rights reserved.
33*/
34
35/*******************************************************************************
36/
37/	File:			ColorTools.cpp
38/
39/   Description:    Additional experimental color manipulation functions.
40/
41/	Copyright 2000, Be Incorporated, All Rights Reserved
42/
43*******************************************************************************/
44
45#include "ColorTools.h"
46
47#if B_BEOS_VERSION <= B_BEOS_VERSION_MAUI
48
49namespace BExperimental {
50
51#if DEBUG
52#define DB_INLINE
53#else
54#define DB_INLINE inline
55#endif
56
57static DB_INLINE void mix_color_func(rgb_color* target, const rgb_color other, uint8 amount)
58{
59	target->red = (uint8)( ((int16(other.red)-int16(target->red))*amount)/255
60								+ target->red );
61	target->green = (uint8)( ((int16(other.green)-int16(target->green))*amount)/255
62								+ target->green );
63	target->blue = (uint8)( ((int16(other.blue)-int16(target->blue))*amount)/255
64								+ target->blue );
65	target->alpha = (uint8)( ((int16(other.alpha)-int16(target->alpha))*amount)/255
66								+ target->alpha );
67}
68
69static DB_INLINE void blend_color_func(rgb_color* target, const rgb_color other, uint8 amount)
70{
71	const uint8 alphaMix = (uint8)( ((int16(other.alpha)-int16(255-target->alpha))*amount)/255
72									+ (255-target->alpha) );
73	target->red = (uint8)( ((int16(other.red)-int16(target->red))*alphaMix)/255
74								+ target->red );
75	target->green = (uint8)( ((int16(other.green)-int16(target->green))*alphaMix)/255
76								+ target->green );
77	target->blue = (uint8)( ((int16(other.blue)-int16(target->blue))*alphaMix)/255
78								+ target->blue );
79	target->alpha = (uint8)( ((int16(other.alpha)-int16(target->alpha))*amount)/255
80								+ target->alpha );
81}
82
83static DB_INLINE void disable_color_func(rgb_color* target, const rgb_color background)
84{
85	blend_color_func(target, background, 255-70);
86}
87
88// --------------------------------------------------------------------------
89
90rgb_color mix_color(rgb_color color1, rgb_color color2, uint8 amount)
91{
92	mix_color_func(&color1, color2, amount);
93	return color1;
94}
95
96rgb_color blend_color(rgb_color color1, rgb_color color2, uint8 amount)
97{
98	blend_color_func(&color1, color2, amount);
99	return color1;
100}
101
102rgb_color disable_color(rgb_color color, rgb_color background)
103{
104	disable_color_func(&color, background);
105	return color;
106}
107
108}
109
110#endif
111