1 /*
2 * Copyright (C) 2011 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 <android/log.h>
18
19 #define ATTRIBUTE_UNUSED __attribute__((unused))
20
invert_process(const char ** inputs,const int * input_sizes,int input_count,char * output,int output_size,void * user_data ATTRIBUTE_UNUSED)21 int invert_process(const char** inputs,
22 const int* input_sizes,
23 int input_count,
24 char* output,
25 int output_size,
26 void* user_data ATTRIBUTE_UNUSED) {
27 // Make sure we have exactly one input
28 if (input_count != 1)
29 return 0;
30
31 // Make sure sizes match up
32 if (input_sizes[0] != output_size)
33 return 0;
34
35 // Get the input and output pointers
36 const char* input_ptr = inputs[0];
37 char* output_ptr = output;
38 if (!input_ptr || !output_ptr)
39 return 0;
40
41 // Run the inversion
42 int i;
43 for (i = 0; i < output_size; ++i)
44 *(output_ptr++) = 255 - *(input_ptr++);
45
46 return 1;
47 }
48
49