samples/risp4ml/isp_stages/blc.c

/*
 * Copyright 2022 Google LLC
 *
 * 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 "samples/risp4ml/common/utils.h"
#include "samples/risp4ml/isp_stages/blc.h"

static BlcParams blc_params = {.enable = true,
                               .offsets = {2048, 2048, 2048, 2048}};

void set_blc_params(BlcParams* params) { blc_params = *params; }

void blc_process(Image* img) {
  if (!blc_params.enable) return;

  for (uint16_t y = 0; y < img->height; ++y) {
    pixel_type_t* line = image_row(img, 0, y);
    for (uint16_t x = 0; x < img->width; ++x) {
      BayerIndex bayer_index = GetBayerIndex(kBayerType, x, y);
      line[x] = SubUnsignedZeroClamp(line[x], blc_params.offsets[bayer_index]);
    }
  }
}