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      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)                             \
     21 extern typeout##2 __attribute__((const, overloadable))   \
     22     convert_##typeout##2(typein##2 i) {                         \
     23         return __builtin_convertvector(i, typeout##2);          \
     24     }                                                           \
     25 extern typeout##3 __attribute__((const, overloadable))   \
     26     convert_##typeout##3(typein##3 i) {                         \
     27         return __builtin_convertvector(i, typeout##3);          \
     28     }                                                           \
     29 extern 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 
     45 CVT_FUNC(char)
     46 CVT_FUNC(uchar)
     47 CVT_FUNC(short)
     48 CVT_FUNC(ushort)
     49 CVT_FUNC(int)
     50 CVT_FUNC(uint)
     51 CVT_FUNC(long)
     52 CVT_FUNC(ulong)
     53 CVT_FUNC(half)
     54 CVT_FUNC(float)
     55 CVT_FUNC(double)
     56 
     57 
     58 /*
     59  * YUV float4 version
     60  */
     61 
     62 static float4 yuv_U_values = {0.f, -0.392f * 0.003921569f, +2.02 * 0.003921569f, 0.f};
     63 static float4 yuv_V_values = {1.603f * 0.003921569f, -0.815f * 0.003921569f, 0.f, 0.f};
     64 
     65 extern 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