/*
 *  Copyright (c) 2016 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include <assert.h>

#include "vpx/vpx_integer.h"
#include "vpx_ports/mem.h"
#include "vpx_dsp/blend.h"
#include "vpx_dsp/vpx_dsp_common.h"

#include "./vpx_dsp_rtcd.h"

// Blending with alpha mask. Mask values come from the range [0, 64],
// as described for VPX_BLEND_A64 in vpx_dsp/blned.h. src0 or src1 can
// be the same as dst, or dst can be different from both sources.

void vpx_blend_a64_mask_c(uint8_t *dst, uint32_t dst_stride,
                          const uint8_t *src0, uint32_t src0_stride,
                          const uint8_t *src1, uint32_t src1_stride,
                          const uint8_t *mask, uint32_t mask_stride,
                          int h, int w, int subh, int subw) {
  int i, j;

  assert(IMPLIES(src0 == dst, src0_stride == dst_stride));
  assert(IMPLIES(src1 == dst, src1_stride == dst_stride));

  assert(h >= 1);
  assert(w >= 1);
  assert(IS_POWER_OF_TWO(h));
  assert(IS_POWER_OF_TWO(w));

  if (subw == 0 && subh == 0) {
    for (i = 0; i < h; ++i) {
      for (j = 0; j < w; ++j) {
        const int m = mask[i * mask_stride + j];
        dst[i * dst_stride + j] = VPX_BLEND_A64(m,
                                                src0[i * src0_stride + j],
                                                src1[i * src1_stride + j]);
      }
    }
  } else if (subw == 1 && subh == 1) {
    for (i = 0; i < h; ++i) {
      for (j = 0; j < w; ++j) {
        const int m =
            ROUND_POWER_OF_TWO(mask[(2 * i) * mask_stride + (2 * j)] +
                               mask[(2 * i + 1) * mask_stride + (2 * j)] +
                               mask[(2 * i) * mask_stride + (2 * j + 1)] +
                               mask[(2 * i + 1) * mask_stride + (2 * j + 1)],
                               2);
        dst[i * dst_stride + j] = VPX_BLEND_A64(m,
                                                src0[i * src0_stride + j],
                                                src1[i * src1_stride + j]);
      }
    }
  } else if (subw == 1 && subh == 0) {
    for (i = 0; i < h; ++i) {
      for (j = 0; j < w; ++j) {
        const int m = VPX_BLEND_AVG(mask[i * mask_stride + (2 * j)],
                                    mask[i * mask_stride + (2 * j + 1)]);
        dst[i * dst_stride + j] = VPX_BLEND_A64(m,
                                                src0[i * src0_stride + j],
                                                src1[i * src1_stride + j]);
      }
    }
  } else {
    for (i = 0; i < h; ++i) {
      for (j = 0; j < w; ++j) {
        const int m = VPX_BLEND_AVG(mask[(2 * i) * mask_stride + j],
                                    mask[(2 * i + 1) * mask_stride + j]);
        dst[i * dst_stride + j] = VPX_BLEND_A64(m,
                                                src0[i * src0_stride + j],
                                                src1[i * src1_stride + j]);
      }
    }
  }
}

#if CONFIG_VP9_HIGHBITDEPTH
void vpx_highbd_blend_a64_mask_c(uint8_t *dst_8, uint32_t dst_stride,
                                 const uint8_t *src0_8, uint32_t src0_stride,
                                 const uint8_t *src1_8, uint32_t src1_stride,
                                 const uint8_t *mask, uint32_t mask_stride,
                                 int h, int w, int subh, int subw, int bd) {
  int i, j;
  uint16_t *dst = CONVERT_TO_SHORTPTR(dst_8);
  const uint16_t *src0 = CONVERT_TO_SHORTPTR(src0_8);
  const uint16_t *src1 = CONVERT_TO_SHORTPTR(src1_8);

  assert(IMPLIES(src0 == dst, src0_stride == dst_stride));
  assert(IMPLIES(src1 == dst, src1_stride == dst_stride));

  assert(h >= 1);
  assert(w >= 1);
  assert(IS_POWER_OF_TWO(h));
  assert(IS_POWER_OF_TWO(w));

  assert(bd == 8 || bd == 10 || bd == 12);

  if (subw == 0 && subh == 0) {
    for (i = 0; i < h; ++i) {
      for (j = 0; j < w; ++j) {
        const int m = mask[i * mask_stride + j];
        dst[i * dst_stride + j] = VPX_BLEND_A64(m,
                                                src0[i * src0_stride + j],
                                                src1[i * src1_stride + j]);
      }
    }
  } else if (subw == 1 && subh == 1) {
    for (i = 0; i < h; ++i) {
      for (j = 0; j < w; ++j) {
        const int m =
            ROUND_POWER_OF_TWO(mask[(2 * i) * mask_stride + (2 * j)] +
                               mask[(2 * i + 1) * mask_stride + (2 * j)] +
                               mask[(2 * i) * mask_stride + (2 * j + 1)] +
                               mask[(2 * i + 1) * mask_stride + (2 * j + 1)],
                               2);
        dst[i * dst_stride + j] = VPX_BLEND_A64(m,
                                                src0[i * src0_stride + j],
                                                src1[i * src1_stride + j]);
      }
    }
  } else if (subw == 1 && subh == 0) {
    for (i = 0; i < h; ++i) {
      for (j = 0; j < w; ++j) {
        const int m = VPX_BLEND_AVG(mask[i * mask_stride + (2 * j)],
                                    mask[i * mask_stride + (2 * j + 1)]);
        dst[i * dst_stride + j] = VPX_BLEND_A64(m,
                                                src0[i * src0_stride + j],
                                                src1[i * src1_stride + j]);
      }
    }
  } else {
    for (i = 0; i < h; ++i) {
      for (j = 0; j < w; ++j) {
        const int m = VPX_BLEND_AVG(mask[(2 * i) * mask_stride + j],
                                    mask[(2 * i + 1) * mask_stride + j]);
        dst[i * dst_stride + j] = VPX_BLEND_A64(m,
                                                src0[i * src0_stride + j],
                                                src1[i * src1_stride + j]);
      }
    }
  }
}
#endif  // CONFIG_VP9_HIGHBITDEPTH