rs_convert.c revision 54cd5d1771ea5c95e181befc66ef8e2a2c1b78cd 
1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "rs_core.rsh"
18
19
20#define CVT_FUNC_2(typeout, typein)                             \
21extern typeout##2 __attribute__((const, overloadable))   \
22    convert_##typeout##2(typein##2 i) {                         \
23        return __builtin_convertvector(i, typeout##2);          \
24    }                                                           \
25extern typeout##3 __attribute__((const, overloadable))   \
26    convert_##typeout##3(typein##3 i) {                         \
27        return __builtin_convertvector(i, typeout##3);          \
28    }                                                           \
29extern typeout##4 __attribute__((const, overloadable))   \
30    convert_##typeout##4(typein##4 i) {                         \
31        return __builtin_convertvector(i, typeout##4);          \
32    }
33#define CVT_FUNC(type)  CVT_FUNC_2(type, uchar)     \
34                        CVT_FUNC_2(type, char)      \
35                        CVT_FUNC_2(type, ushort)    \
36                        CVT_FUNC_2(type, short)     \
37                        CVT_FUNC_2(type, uint)      \
38                        CVT_FUNC_2(type, int)       \
39                        CVT_FUNC_2(type, ulong)     \
40                        CVT_FUNC_2(type, long)      \
41                        CVT_FUNC_2(type, half)      \
42                        CVT_FUNC_2(type, float)     \
43                        CVT_FUNC_2(type, double)
44
45CVT_FUNC(char)
46CVT_FUNC(uchar)
47CVT_FUNC(short)
48CVT_FUNC(ushort)
49CVT_FUNC(int)
50CVT_FUNC(uint)
51CVT_FUNC(long)
52CVT_FUNC(ulong)
53CVT_FUNC(half)
54CVT_FUNC(float)
55CVT_FUNC(double)
56
57
58/*
59 * YUV float4 version
60 */
61
62static float4 yuv_U_values = {0.f, -0.392f * 0.003921569f, +2.02 * 0.003921569f, 0.f};
63static float4 yuv_V_values = {1.603f * 0.003921569f, -0.815f * 0.003921569f, 0.f, 0.f};
64
65extern float4 __attribute__((overloadable)) rsYuvToRGBA_float4(uchar y, uchar u, uchar v) {
66    float4 color = (float)y * 0.003921569f;
67    float4 fU = ((float)u) - 128.f;
68    float4 fV = ((float)v) - 128.f;
69
70    color += fU * yuv_U_values;
71    color += fV * yuv_V_values;
72    color = clamp(color, 0.f, 1.f);
73    return color;
74}
75
76