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 #include <stdlib.h> 19 20 #define LOGI(...) __android_log_print(ANDROID_LOG_INFO, "MCA", __VA_ARGS__) 21 #define LOGW(...) __android_log_print(ANDROID_LOG_WARN, "MCA", __VA_ARGS__) 22 #define LOGE(...) __android_log_print(ANDROID_LOG_ERROR, "MCA", __VA_ARGS__) 23 24 typedef struct { 25 float contrast; 26 } ContrastParameters; 27 28 void contrast_init(void** user_data) { 29 (*user_data) = malloc(sizeof(ContrastParameters)); 30 } 31 32 void contrast_teardown(void* user_data) { 33 free(user_data); 34 } 35 36 void contrast_setvalue(const char* key, const char* value, void* user_data) { 37 if (strcmp(key, "contrast") == 0) 38 ((ContrastParameters*)user_data)->contrast = atof(value); 39 else 40 LOGE("Unknown parameter: %s!", key); 41 } 42 43 int contrast_process(const char** inputs, 44 const int* input_sizes, 45 int input_count, 46 char* output, 47 int output_size, 48 void* user_data) { 49 // Make sure we have exactly one input 50 if (input_count != 1) { 51 LOGE("Contrast: Incorrect input count! Expected 1 but got %d!", input_count); 52 return 0; 53 } 54 55 // Make sure sizes match up 56 if (input_sizes[0] != output_size) { 57 LOGE("Contrast: Input-output sizes do not match up. %d vs. %d!", input_sizes[0], output_size); 58 return 0; 59 } 60 61 // Get the input and output pointers 62 const char* input_ptr = inputs[0]; 63 char* output_ptr = output; 64 if (!input_ptr || !output_ptr) { 65 LOGE("Contrast: No input or output pointer found!"); 66 return 0; 67 } 68 69 // Get the parameters 70 ContrastParameters* params = (ContrastParameters*)user_data; 71 const float contrast = params->contrast; 72 73 // Run the contrast adjustment 74 int i; 75 for (i = 0; i < output_size; ++i) { 76 float px = *(input_ptr++) / 255.0; 77 px -= 0.5; 78 px *= contrast; 79 px += 0.5; 80 *(output_ptr++) = (char)(px > 1.0 ? 255.0 : (px < 0.0 ? 0.0 : px * 255.0)); 81 } 82 83 return 1; 84 } 85 86
