risp4ml/isp_stages/blc_test.cc

/*
 * Copyright 2023 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 "risp4ml/isp_stages/blc.h"

#include "pw_unit_test/framework.h"
#include "risp4ml/common/constants.h"
#include "risp4ml/common/test_utils.h"

static constexpr int kFrameSize = 16;
static constexpr int kNumPatterns = 4;

class BlcTest : public ::testing::Test {
 protected:
  void SetUp() override {
    in_ = image_new(1, kFrameSize, kFrameSize);
    InitImageRandom(in_, 0, kRawPipelineMaxVal);
    // Force max/min values to be included.
    *image_pixel(in_, 0, 0, 0) = 0;
    *image_pixel(in_, 0, 0, 1) = kRawPipelineMaxVal;
    out_ = image_new(1, kFrameSize, kFrameSize);
    const uint32_t num_bytes =
        in_->num_channels * in_->height * in_->width * sizeof(pixel_type_t);
    memcpy(out_->data, in_->data, num_bytes);
  }
  void TearDown() override {
    image_delete(in_);
    image_delete(out_);
  }

  Image* in_;
  Image* out_;
};

TEST_F(BlcTest, Bypass) {
  BlcParams params = {.enable = false, .offsets = {20, 20, 20, 20}};
  set_blc_params(&params);

  blc_process(out_);

  // Expect no change
  for (uint16_t c = 0; c < in_->num_channels; ++c) {
    for (uint16_t y = 0; y < in_->height; ++y) {
      for (uint16_t x = 0; x < in_->width; ++x) {
        ASSERT_EQ(image_pixel_val(in_, c, y, x),
                  image_pixel_val(out_, c, y, x));
      }
    }
  }
}

TEST_F(BlcTest, NoChangeRandomPixel) {
  // Set all 4 Bayer channel offsets to 0.
  BlcParams params = {.enable = true, .offsets = {0, 0, 0, 0}};
  set_blc_params(&params);

  blc_process(out_);

  // Expect no change
  for (uint16_t c = 0; c < in_->num_channels; ++c) {
    for (uint16_t y = 0; y < in_->height; ++y) {
      for (uint16_t x = 0; x < in_->width; ++x) {
        ASSERT_EQ(image_pixel_val(in_, c, y, x),
                  image_pixel_val(out_, c, y, x));
      }
    }
  }
}

TEST_F(BlcTest, MaxOffsetClampToZero) {
  // Set all 4 Bayer channel offsets to max allowed value.
  BlcParams params = {.enable = true,
                      .offsets = {kRawPipelineMaxVal, kRawPipelineMaxVal,
                                  kRawPipelineMaxVal, kRawPipelineMaxVal}};
  set_blc_params(&params);

  blc_process(out_);

  // Expect correct subtraction
  for (uint16_t c = 0; c < in_->num_channels; ++c) {
    for (uint16_t y = 0; y < in_->height; ++y) {
      for (uint16_t x = 0; x < in_->width; ++x) {
        ASSERT_EQ(0, image_pixel_val(out_, c, y, x));
      }
    }
  }
}