| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <android/log.h> |
| #include <stdlib.h> |
| |
| #define LOGI(...) __android_log_print(ANDROID_LOG_INFO, "MCA", __VA_ARGS__) |
| #define LOGW(...) __android_log_print(ANDROID_LOG_WARN, "MCA", __VA_ARGS__) |
| #define LOGE(...) __android_log_print(ANDROID_LOG_ERROR, "MCA", __VA_ARGS__) |
| |
| typedef struct { |
| float contrast; |
| } ContrastParameters; |
| |
| void contrast_init(void** user_data) { |
| (*user_data) = malloc(sizeof(ContrastParameters)); |
| } |
| |
| void contrast_teardown(void* user_data) { |
| free(user_data); |
| } |
| |
| void contrast_setvalue(const char* key, const char* value, void* user_data) { |
| if (strcmp(key, "contrast") == 0) |
| ((ContrastParameters*)user_data)->contrast = atof(value); |
| else |
| LOGE("Unknown parameter: %s!", key); |
| } |
| |
| int contrast_process(const char** inputs, |
| const int* input_sizes, |
| int input_count, |
| char* output, |
| int output_size, |
| void* user_data) { |
| // Make sure we have exactly one input |
| if (input_count != 1) { |
| LOGE("Contrast: Incorrect input count! Expected 1 but got %d!", input_count); |
| return 0; |
| } |
| |
| // Make sure sizes match up |
| if (input_sizes[0] != output_size) { |
| LOGE("Contrast: Input-output sizes do not match up. %d vs. %d!", input_sizes[0], output_size); |
| return 0; |
| } |
| |
| // Get the input and output pointers |
| const char* input_ptr = inputs[0]; |
| char* output_ptr = output; |
| if (!input_ptr || !output_ptr) { |
| LOGE("Contrast: No input or output pointer found!"); |
| return 0; |
| } |
| |
| // Get the parameters |
| ContrastParameters* params = (ContrastParameters*)user_data; |
| const float contrast = params->contrast; |
| |
| // Run the contrast adjustment |
| int i; |
| for (i = 0; i < output_size; ++i) { |
| float px = *(input_ptr++) / 255.0; |
| px -= 0.5; |
| px *= contrast; |
| px += 0.5; |
| *(output_ptr++) = (char)(px > 1.0 ? 255.0 : (px < 0.0 ? 0.0 : px * 255.0)); |
| } |
| |
| return 1; |
| } |
| |