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/*
* Copyright 2011 The LibYuv 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 "libyuv/row.h"
#include <assert.h>
#include <string.h> // For memcpy and memset.
#include "libyuv/basic_types.h"
#define STATIC_CAST(type, expr) (type)(expr)
void CopyRow_C(const uint8_t* src, uint8_t* dst, int count) {
memcpy(dst, src, count);
}
// Blend 2 rows into 1.
static void HalfRow_C(const uint8_t* src_uv,
ptrdiff_t src_uv_stride,
uint8_t* dst_uv,
int width) {
int x;
for (x = 0; x < width; ++x) {
dst_uv[x] = (src_uv[x] + src_uv[src_uv_stride + x] + 1) >> 1;
}
}
static void HalfRow_16_C(const uint16_t* src_uv,
ptrdiff_t src_uv_stride,
uint16_t* dst_uv,
int width) {
int x;
for (x = 0; x < width; ++x) {
dst_uv[x] = (src_uv[x] + src_uv[src_uv_stride + x] + 1) >> 1;
}
}
// C version 2x2 -> 2x1.
void InterpolateRow_C(uint8_t* dst_ptr,
const uint8_t* src_ptr,
ptrdiff_t src_stride,
int width,
int source_y_fraction) {
int y1_fraction = source_y_fraction;
int y0_fraction = 256 - y1_fraction;
const uint8_t* src_ptr1 = src_ptr + src_stride;
int x;
assert(source_y_fraction >= 0);
assert(source_y_fraction < 256);
if (y1_fraction == 0) {
memcpy(dst_ptr, src_ptr, width);
return;
}
if (y1_fraction == 128) {
HalfRow_C(src_ptr, src_stride, dst_ptr, width);
return;
}
for (x = 0; x < width; ++x) {
dst_ptr[0] = STATIC_CAST(
uint8_t,
(src_ptr[0] * y0_fraction + src_ptr1[0] * y1_fraction + 128) >> 8);
++src_ptr;
++src_ptr1;
++dst_ptr;
}
}
// C version 2x2 -> 2x1.
void InterpolateRow_16_C(uint16_t* dst_ptr,
const uint16_t* src_ptr,
ptrdiff_t src_stride,
int width,
int source_y_fraction) {
int y1_fraction = source_y_fraction;
int y0_fraction = 256 - y1_fraction;
const uint16_t* src_ptr1 = src_ptr + src_stride;
int x;
assert(source_y_fraction >= 0);
assert(source_y_fraction < 256);
if (y1_fraction == 0) {
memcpy(dst_ptr, src_ptr, width * 2);
return;
}
if (y1_fraction == 128) {
HalfRow_16_C(src_ptr, src_stride, dst_ptr, width);
return;
}
for (x = 0; x < width; ++x) {
dst_ptr[0] = STATIC_CAST(
uint16_t,
(src_ptr[0] * y0_fraction + src_ptr1[0] * y1_fraction + 128) >> 8);
++src_ptr;
++src_ptr1;
++dst_ptr;
}
}
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