1138 строки
34 KiB
C++
1138 строки
34 KiB
C++
/*
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* Copyright 2013 The LibYuv Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "libyuv/scale.h"
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#include <assert.h>
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#include <string.h>
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#include "libyuv/cpu_id.h"
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#include "libyuv/planar_functions.h" // For CopyARGB
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#include "libyuv/row.h"
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#include "libyuv/scale_row.h"
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#ifdef __cplusplus
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namespace libyuv {
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extern "C" {
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#endif
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static __inline int Abs(int v) {
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return v >= 0 ? v : -v;
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}
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// CPU agnostic row functions
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void ScaleRowDown2_C(const uint8* src_ptr, ptrdiff_t src_stride,
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uint8* dst, int dst_width) {
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int x;
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for (x = 0; x < dst_width - 1; x += 2) {
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dst[0] = src_ptr[1];
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dst[1] = src_ptr[3];
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dst += 2;
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src_ptr += 4;
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}
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if (dst_width & 1) {
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dst[0] = src_ptr[1];
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}
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}
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void ScaleRowDown2_16_C(const uint16* src_ptr, ptrdiff_t src_stride,
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uint16* dst, int dst_width) {
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int x;
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for (x = 0; x < dst_width - 1; x += 2) {
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dst[0] = src_ptr[1];
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dst[1] = src_ptr[3];
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dst += 2;
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src_ptr += 4;
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}
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if (dst_width & 1) {
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dst[0] = src_ptr[1];
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}
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}
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void ScaleRowDown2Linear_C(const uint8* src_ptr, ptrdiff_t src_stride,
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uint8* dst, int dst_width) {
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const uint8* s = src_ptr;
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int x;
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for (x = 0; x < dst_width - 1; x += 2) {
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dst[0] = (s[0] + s[1] + 1) >> 1;
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dst[1] = (s[2] + s[3] + 1) >> 1;
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dst += 2;
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s += 4;
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}
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if (dst_width & 1) {
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dst[0] = (s[0] + s[1] + 1) >> 1;
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}
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}
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void ScaleRowDown2Linear_16_C(const uint16* src_ptr, ptrdiff_t src_stride,
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uint16* dst, int dst_width) {
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const uint16* s = src_ptr;
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int x;
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for (x = 0; x < dst_width - 1; x += 2) {
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dst[0] = (s[0] + s[1] + 1) >> 1;
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dst[1] = (s[2] + s[3] + 1) >> 1;
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dst += 2;
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s += 4;
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}
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if (dst_width & 1) {
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dst[0] = (s[0] + s[1] + 1) >> 1;
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}
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}
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void ScaleRowDown2Box_C(const uint8* src_ptr, ptrdiff_t src_stride,
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uint8* dst, int dst_width) {
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const uint8* s = src_ptr;
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const uint8* t = src_ptr + src_stride;
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int x;
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for (x = 0; x < dst_width - 1; x += 2) {
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dst[0] = (s[0] + s[1] + t[0] + t[1] + 2) >> 2;
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dst[1] = (s[2] + s[3] + t[2] + t[3] + 2) >> 2;
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dst += 2;
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s += 4;
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t += 4;
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}
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if (dst_width & 1) {
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dst[0] = (s[0] + s[1] + t[0] + t[1] + 2) >> 2;
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}
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}
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void ScaleRowDown2Box_16_C(const uint16* src_ptr, ptrdiff_t src_stride,
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uint16* dst, int dst_width) {
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const uint16* s = src_ptr;
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const uint16* t = src_ptr + src_stride;
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int x;
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for (x = 0; x < dst_width - 1; x += 2) {
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dst[0] = (s[0] + s[1] + t[0] + t[1] + 2) >> 2;
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dst[1] = (s[2] + s[3] + t[2] + t[3] + 2) >> 2;
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dst += 2;
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s += 4;
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t += 4;
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}
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if (dst_width & 1) {
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dst[0] = (s[0] + s[1] + t[0] + t[1] + 2) >> 2;
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}
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}
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void ScaleRowDown4_C(const uint8* src_ptr, ptrdiff_t src_stride,
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uint8* dst, int dst_width) {
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int x;
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for (x = 0; x < dst_width - 1; x += 2) {
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dst[0] = src_ptr[2];
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dst[1] = src_ptr[6];
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dst += 2;
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src_ptr += 8;
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}
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if (dst_width & 1) {
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dst[0] = src_ptr[2];
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}
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}
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void ScaleRowDown4_16_C(const uint16* src_ptr, ptrdiff_t src_stride,
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uint16* dst, int dst_width) {
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int x;
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for (x = 0; x < dst_width - 1; x += 2) {
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dst[0] = src_ptr[2];
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dst[1] = src_ptr[6];
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dst += 2;
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src_ptr += 8;
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}
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if (dst_width & 1) {
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dst[0] = src_ptr[2];
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}
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}
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void ScaleRowDown4Box_C(const uint8* src_ptr, ptrdiff_t src_stride,
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uint8* dst, int dst_width) {
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intptr_t stride = src_stride;
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int x;
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for (x = 0; x < dst_width - 1; x += 2) {
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dst[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[3] +
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src_ptr[stride + 0] + src_ptr[stride + 1] +
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src_ptr[stride + 2] + src_ptr[stride + 3] +
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src_ptr[stride * 2 + 0] + src_ptr[stride * 2 + 1] +
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src_ptr[stride * 2 + 2] + src_ptr[stride * 2 + 3] +
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src_ptr[stride * 3 + 0] + src_ptr[stride * 3 + 1] +
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src_ptr[stride * 3 + 2] + src_ptr[stride * 3 + 3] +
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8) >> 4;
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dst[1] = (src_ptr[4] + src_ptr[5] + src_ptr[6] + src_ptr[7] +
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src_ptr[stride + 4] + src_ptr[stride + 5] +
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src_ptr[stride + 6] + src_ptr[stride + 7] +
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src_ptr[stride * 2 + 4] + src_ptr[stride * 2 + 5] +
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src_ptr[stride * 2 + 6] + src_ptr[stride * 2 + 7] +
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src_ptr[stride * 3 + 4] + src_ptr[stride * 3 + 5] +
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src_ptr[stride * 3 + 6] + src_ptr[stride * 3 + 7] +
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8) >> 4;
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dst += 2;
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src_ptr += 8;
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}
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if (dst_width & 1) {
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dst[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[3] +
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src_ptr[stride + 0] + src_ptr[stride + 1] +
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src_ptr[stride + 2] + src_ptr[stride + 3] +
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src_ptr[stride * 2 + 0] + src_ptr[stride * 2 + 1] +
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src_ptr[stride * 2 + 2] + src_ptr[stride * 2 + 3] +
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src_ptr[stride * 3 + 0] + src_ptr[stride * 3 + 1] +
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src_ptr[stride * 3 + 2] + src_ptr[stride * 3 + 3] +
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8) >> 4;
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}
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}
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void ScaleRowDown4Box_16_C(const uint16* src_ptr, ptrdiff_t src_stride,
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uint16* dst, int dst_width) {
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intptr_t stride = src_stride;
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int x;
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for (x = 0; x < dst_width - 1; x += 2) {
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dst[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[3] +
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src_ptr[stride + 0] + src_ptr[stride + 1] +
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src_ptr[stride + 2] + src_ptr[stride + 3] +
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src_ptr[stride * 2 + 0] + src_ptr[stride * 2 + 1] +
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src_ptr[stride * 2 + 2] + src_ptr[stride * 2 + 3] +
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src_ptr[stride * 3 + 0] + src_ptr[stride * 3 + 1] +
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src_ptr[stride * 3 + 2] + src_ptr[stride * 3 + 3] +
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8) >> 4;
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dst[1] = (src_ptr[4] + src_ptr[5] + src_ptr[6] + src_ptr[7] +
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src_ptr[stride + 4] + src_ptr[stride + 5] +
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src_ptr[stride + 6] + src_ptr[stride + 7] +
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src_ptr[stride * 2 + 4] + src_ptr[stride * 2 + 5] +
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src_ptr[stride * 2 + 6] + src_ptr[stride * 2 + 7] +
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src_ptr[stride * 3 + 4] + src_ptr[stride * 3 + 5] +
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src_ptr[stride * 3 + 6] + src_ptr[stride * 3 + 7] +
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8) >> 4;
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dst += 2;
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src_ptr += 8;
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}
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if (dst_width & 1) {
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dst[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[3] +
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src_ptr[stride + 0] + src_ptr[stride + 1] +
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src_ptr[stride + 2] + src_ptr[stride + 3] +
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src_ptr[stride * 2 + 0] + src_ptr[stride * 2 + 1] +
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src_ptr[stride * 2 + 2] + src_ptr[stride * 2 + 3] +
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src_ptr[stride * 3 + 0] + src_ptr[stride * 3 + 1] +
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src_ptr[stride * 3 + 2] + src_ptr[stride * 3 + 3] +
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8) >> 4;
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}
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}
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void ScaleRowDown34_C(const uint8* src_ptr, ptrdiff_t src_stride,
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uint8* dst, int dst_width) {
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int x;
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assert((dst_width % 3 == 0) && (dst_width > 0));
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for (x = 0; x < dst_width; x += 3) {
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dst[0] = src_ptr[0];
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dst[1] = src_ptr[1];
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dst[2] = src_ptr[3];
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dst += 3;
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src_ptr += 4;
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}
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}
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void ScaleRowDown34_16_C(const uint16* src_ptr, ptrdiff_t src_stride,
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uint16* dst, int dst_width) {
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int x;
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assert((dst_width % 3 == 0) && (dst_width > 0));
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for (x = 0; x < dst_width; x += 3) {
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dst[0] = src_ptr[0];
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dst[1] = src_ptr[1];
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dst[2] = src_ptr[3];
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dst += 3;
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src_ptr += 4;
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}
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}
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// Filter rows 0 and 1 together, 3 : 1
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void ScaleRowDown34_0_Box_C(const uint8* src_ptr, ptrdiff_t src_stride,
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uint8* d, int dst_width) {
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const uint8* s = src_ptr;
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const uint8* t = src_ptr + src_stride;
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int x;
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assert((dst_width % 3 == 0) && (dst_width > 0));
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for (x = 0; x < dst_width; x += 3) {
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uint8 a0 = (s[0] * 3 + s[1] * 1 + 2) >> 2;
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uint8 a1 = (s[1] * 1 + s[2] * 1 + 1) >> 1;
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uint8 a2 = (s[2] * 1 + s[3] * 3 + 2) >> 2;
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uint8 b0 = (t[0] * 3 + t[1] * 1 + 2) >> 2;
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uint8 b1 = (t[1] * 1 + t[2] * 1 + 1) >> 1;
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uint8 b2 = (t[2] * 1 + t[3] * 3 + 2) >> 2;
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d[0] = (a0 * 3 + b0 + 2) >> 2;
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d[1] = (a1 * 3 + b1 + 2) >> 2;
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d[2] = (a2 * 3 + b2 + 2) >> 2;
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d += 3;
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s += 4;
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t += 4;
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}
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}
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void ScaleRowDown34_0_Box_16_C(const uint16* src_ptr, ptrdiff_t src_stride,
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uint16* d, int dst_width) {
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const uint16* s = src_ptr;
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const uint16* t = src_ptr + src_stride;
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int x;
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assert((dst_width % 3 == 0) && (dst_width > 0));
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for (x = 0; x < dst_width; x += 3) {
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uint16 a0 = (s[0] * 3 + s[1] * 1 + 2) >> 2;
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uint16 a1 = (s[1] * 1 + s[2] * 1 + 1) >> 1;
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uint16 a2 = (s[2] * 1 + s[3] * 3 + 2) >> 2;
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uint16 b0 = (t[0] * 3 + t[1] * 1 + 2) >> 2;
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uint16 b1 = (t[1] * 1 + t[2] * 1 + 1) >> 1;
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uint16 b2 = (t[2] * 1 + t[3] * 3 + 2) >> 2;
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d[0] = (a0 * 3 + b0 + 2) >> 2;
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d[1] = (a1 * 3 + b1 + 2) >> 2;
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d[2] = (a2 * 3 + b2 + 2) >> 2;
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d += 3;
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s += 4;
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t += 4;
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}
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}
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// Filter rows 1 and 2 together, 1 : 1
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void ScaleRowDown34_1_Box_C(const uint8* src_ptr, ptrdiff_t src_stride,
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uint8* d, int dst_width) {
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const uint8* s = src_ptr;
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const uint8* t = src_ptr + src_stride;
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int x;
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assert((dst_width % 3 == 0) && (dst_width > 0));
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for (x = 0; x < dst_width; x += 3) {
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uint8 a0 = (s[0] * 3 + s[1] * 1 + 2) >> 2;
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uint8 a1 = (s[1] * 1 + s[2] * 1 + 1) >> 1;
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uint8 a2 = (s[2] * 1 + s[3] * 3 + 2) >> 2;
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uint8 b0 = (t[0] * 3 + t[1] * 1 + 2) >> 2;
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uint8 b1 = (t[1] * 1 + t[2] * 1 + 1) >> 1;
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uint8 b2 = (t[2] * 1 + t[3] * 3 + 2) >> 2;
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d[0] = (a0 + b0 + 1) >> 1;
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d[1] = (a1 + b1 + 1) >> 1;
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d[2] = (a2 + b2 + 1) >> 1;
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d += 3;
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s += 4;
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t += 4;
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}
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}
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void ScaleRowDown34_1_Box_16_C(const uint16* src_ptr, ptrdiff_t src_stride,
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uint16* d, int dst_width) {
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const uint16* s = src_ptr;
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const uint16* t = src_ptr + src_stride;
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int x;
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assert((dst_width % 3 == 0) && (dst_width > 0));
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for (x = 0; x < dst_width; x += 3) {
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uint16 a0 = (s[0] * 3 + s[1] * 1 + 2) >> 2;
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uint16 a1 = (s[1] * 1 + s[2] * 1 + 1) >> 1;
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uint16 a2 = (s[2] * 1 + s[3] * 3 + 2) >> 2;
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uint16 b0 = (t[0] * 3 + t[1] * 1 + 2) >> 2;
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uint16 b1 = (t[1] * 1 + t[2] * 1 + 1) >> 1;
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uint16 b2 = (t[2] * 1 + t[3] * 3 + 2) >> 2;
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d[0] = (a0 + b0 + 1) >> 1;
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d[1] = (a1 + b1 + 1) >> 1;
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d[2] = (a2 + b2 + 1) >> 1;
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d += 3;
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s += 4;
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t += 4;
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}
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}
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// Scales a single row of pixels using point sampling.
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void ScaleCols_C(uint8* dst_ptr, const uint8* src_ptr,
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int dst_width, int x, int dx) {
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int j;
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for (j = 0; j < dst_width - 1; j += 2) {
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dst_ptr[0] = src_ptr[x >> 16];
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x += dx;
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dst_ptr[1] = src_ptr[x >> 16];
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x += dx;
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dst_ptr += 2;
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}
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if (dst_width & 1) {
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dst_ptr[0] = src_ptr[x >> 16];
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}
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}
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void ScaleCols_16_C(uint16* dst_ptr, const uint16* src_ptr,
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int dst_width, int x, int dx) {
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int j;
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for (j = 0; j < dst_width - 1; j += 2) {
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dst_ptr[0] = src_ptr[x >> 16];
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x += dx;
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dst_ptr[1] = src_ptr[x >> 16];
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x += dx;
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dst_ptr += 2;
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}
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if (dst_width & 1) {
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dst_ptr[0] = src_ptr[x >> 16];
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}
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}
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// Scales a single row of pixels up by 2x using point sampling.
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void ScaleColsUp2_C(uint8* dst_ptr, const uint8* src_ptr,
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int dst_width, int x, int dx) {
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int j;
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for (j = 0; j < dst_width - 1; j += 2) {
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dst_ptr[1] = dst_ptr[0] = src_ptr[0];
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src_ptr += 1;
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dst_ptr += 2;
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}
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if (dst_width & 1) {
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dst_ptr[0] = src_ptr[0];
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}
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}
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void ScaleColsUp2_16_C(uint16* dst_ptr, const uint16* src_ptr,
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int dst_width, int x, int dx) {
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int j;
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for (j = 0; j < dst_width - 1; j += 2) {
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dst_ptr[1] = dst_ptr[0] = src_ptr[0];
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src_ptr += 1;
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dst_ptr += 2;
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}
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if (dst_width & 1) {
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dst_ptr[0] = src_ptr[0];
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}
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}
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// (1-f)a + fb can be replaced with a + f(b-a)
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#define BLENDER(a, b, f) (uint8)((int)(a) + \
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((int)(f) * ((int)(b) - (int)(a)) >> 16))
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void ScaleFilterCols_C(uint8* dst_ptr, const uint8* src_ptr,
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int dst_width, int x, int dx) {
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int j;
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for (j = 0; j < dst_width - 1; j += 2) {
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int xi = x >> 16;
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int a = src_ptr[xi];
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int b = src_ptr[xi + 1];
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dst_ptr[0] = BLENDER(a, b, x & 0xffff);
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x += dx;
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xi = x >> 16;
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a = src_ptr[xi];
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b = src_ptr[xi + 1];
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dst_ptr[1] = BLENDER(a, b, x & 0xffff);
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x += dx;
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dst_ptr += 2;
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}
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if (dst_width & 1) {
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int xi = x >> 16;
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int a = src_ptr[xi];
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int b = src_ptr[xi + 1];
|
|
dst_ptr[0] = BLENDER(a, b, x & 0xffff);
|
|
}
|
|
}
|
|
|
|
void ScaleFilterCols64_C(uint8* dst_ptr, const uint8* src_ptr,
|
|
int dst_width, int x32, int dx) {
|
|
int64 x = (int64)(x32);
|
|
int j;
|
|
for (j = 0; j < dst_width - 1; j += 2) {
|
|
int64 xi = x >> 16;
|
|
int a = src_ptr[xi];
|
|
int b = src_ptr[xi + 1];
|
|
dst_ptr[0] = BLENDER(a, b, x & 0xffff);
|
|
x += dx;
|
|
xi = x >> 16;
|
|
a = src_ptr[xi];
|
|
b = src_ptr[xi + 1];
|
|
dst_ptr[1] = BLENDER(a, b, x & 0xffff);
|
|
x += dx;
|
|
dst_ptr += 2;
|
|
}
|
|
if (dst_width & 1) {
|
|
int64 xi = x >> 16;
|
|
int a = src_ptr[xi];
|
|
int b = src_ptr[xi + 1];
|
|
dst_ptr[0] = BLENDER(a, b, x & 0xffff);
|
|
}
|
|
}
|
|
#undef BLENDER
|
|
|
|
#define BLENDER(a, b, f) (uint16)((int)(a) + \
|
|
((int)(f) * ((int)(b) - (int)(a)) >> 16))
|
|
|
|
void ScaleFilterCols_16_C(uint16* dst_ptr, const uint16* src_ptr,
|
|
int dst_width, int x, int dx) {
|
|
int j;
|
|
for (j = 0; j < dst_width - 1; j += 2) {
|
|
int xi = x >> 16;
|
|
int a = src_ptr[xi];
|
|
int b = src_ptr[xi + 1];
|
|
dst_ptr[0] = BLENDER(a, b, x & 0xffff);
|
|
x += dx;
|
|
xi = x >> 16;
|
|
a = src_ptr[xi];
|
|
b = src_ptr[xi + 1];
|
|
dst_ptr[1] = BLENDER(a, b, x & 0xffff);
|
|
x += dx;
|
|
dst_ptr += 2;
|
|
}
|
|
if (dst_width & 1) {
|
|
int xi = x >> 16;
|
|
int a = src_ptr[xi];
|
|
int b = src_ptr[xi + 1];
|
|
dst_ptr[0] = BLENDER(a, b, x & 0xffff);
|
|
}
|
|
}
|
|
|
|
void ScaleFilterCols64_16_C(uint16* dst_ptr, const uint16* src_ptr,
|
|
int dst_width, int x32, int dx) {
|
|
int64 x = (int64)(x32);
|
|
int j;
|
|
for (j = 0; j < dst_width - 1; j += 2) {
|
|
int64 xi = x >> 16;
|
|
int a = src_ptr[xi];
|
|
int b = src_ptr[xi + 1];
|
|
dst_ptr[0] = BLENDER(a, b, x & 0xffff);
|
|
x += dx;
|
|
xi = x >> 16;
|
|
a = src_ptr[xi];
|
|
b = src_ptr[xi + 1];
|
|
dst_ptr[1] = BLENDER(a, b, x & 0xffff);
|
|
x += dx;
|
|
dst_ptr += 2;
|
|
}
|
|
if (dst_width & 1) {
|
|
int64 xi = x >> 16;
|
|
int a = src_ptr[xi];
|
|
int b = src_ptr[xi + 1];
|
|
dst_ptr[0] = BLENDER(a, b, x & 0xffff);
|
|
}
|
|
}
|
|
#undef BLENDER
|
|
|
|
void ScaleRowDown38_C(const uint8* src_ptr, ptrdiff_t src_stride,
|
|
uint8* dst, int dst_width) {
|
|
int x;
|
|
assert(dst_width % 3 == 0);
|
|
for (x = 0; x < dst_width; x += 3) {
|
|
dst[0] = src_ptr[0];
|
|
dst[1] = src_ptr[3];
|
|
dst[2] = src_ptr[6];
|
|
dst += 3;
|
|
src_ptr += 8;
|
|
}
|
|
}
|
|
|
|
void ScaleRowDown38_16_C(const uint16* src_ptr, ptrdiff_t src_stride,
|
|
uint16* dst, int dst_width) {
|
|
int x;
|
|
assert(dst_width % 3 == 0);
|
|
for (x = 0; x < dst_width; x += 3) {
|
|
dst[0] = src_ptr[0];
|
|
dst[1] = src_ptr[3];
|
|
dst[2] = src_ptr[6];
|
|
dst += 3;
|
|
src_ptr += 8;
|
|
}
|
|
}
|
|
|
|
// 8x3 -> 3x1
|
|
void ScaleRowDown38_3_Box_C(const uint8* src_ptr,
|
|
ptrdiff_t src_stride,
|
|
uint8* dst_ptr, int dst_width) {
|
|
intptr_t stride = src_stride;
|
|
int i;
|
|
assert((dst_width % 3 == 0) && (dst_width > 0));
|
|
for (i = 0; i < dst_width; i += 3) {
|
|
dst_ptr[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] +
|
|
src_ptr[stride + 0] + src_ptr[stride + 1] +
|
|
src_ptr[stride + 2] + src_ptr[stride * 2 + 0] +
|
|
src_ptr[stride * 2 + 1] + src_ptr[stride * 2 + 2]) *
|
|
(65536 / 9) >> 16;
|
|
dst_ptr[1] = (src_ptr[3] + src_ptr[4] + src_ptr[5] +
|
|
src_ptr[stride + 3] + src_ptr[stride + 4] +
|
|
src_ptr[stride + 5] + src_ptr[stride * 2 + 3] +
|
|
src_ptr[stride * 2 + 4] + src_ptr[stride * 2 + 5]) *
|
|
(65536 / 9) >> 16;
|
|
dst_ptr[2] = (src_ptr[6] + src_ptr[7] +
|
|
src_ptr[stride + 6] + src_ptr[stride + 7] +
|
|
src_ptr[stride * 2 + 6] + src_ptr[stride * 2 + 7]) *
|
|
(65536 / 6) >> 16;
|
|
src_ptr += 8;
|
|
dst_ptr += 3;
|
|
}
|
|
}
|
|
|
|
void ScaleRowDown38_3_Box_16_C(const uint16* src_ptr,
|
|
ptrdiff_t src_stride,
|
|
uint16* dst_ptr, int dst_width) {
|
|
intptr_t stride = src_stride;
|
|
int i;
|
|
assert((dst_width % 3 == 0) && (dst_width > 0));
|
|
for (i = 0; i < dst_width; i += 3) {
|
|
dst_ptr[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] +
|
|
src_ptr[stride + 0] + src_ptr[stride + 1] +
|
|
src_ptr[stride + 2] + src_ptr[stride * 2 + 0] +
|
|
src_ptr[stride * 2 + 1] + src_ptr[stride * 2 + 2]) *
|
|
(65536 / 9) >> 16;
|
|
dst_ptr[1] = (src_ptr[3] + src_ptr[4] + src_ptr[5] +
|
|
src_ptr[stride + 3] + src_ptr[stride + 4] +
|
|
src_ptr[stride + 5] + src_ptr[stride * 2 + 3] +
|
|
src_ptr[stride * 2 + 4] + src_ptr[stride * 2 + 5]) *
|
|
(65536 / 9) >> 16;
|
|
dst_ptr[2] = (src_ptr[6] + src_ptr[7] +
|
|
src_ptr[stride + 6] + src_ptr[stride + 7] +
|
|
src_ptr[stride * 2 + 6] + src_ptr[stride * 2 + 7]) *
|
|
(65536 / 6) >> 16;
|
|
src_ptr += 8;
|
|
dst_ptr += 3;
|
|
}
|
|
}
|
|
|
|
// 8x2 -> 3x1
|
|
void ScaleRowDown38_2_Box_C(const uint8* src_ptr, ptrdiff_t src_stride,
|
|
uint8* dst_ptr, int dst_width) {
|
|
intptr_t stride = src_stride;
|
|
int i;
|
|
assert((dst_width % 3 == 0) && (dst_width > 0));
|
|
for (i = 0; i < dst_width; i += 3) {
|
|
dst_ptr[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] +
|
|
src_ptr[stride + 0] + src_ptr[stride + 1] +
|
|
src_ptr[stride + 2]) * (65536 / 6) >> 16;
|
|
dst_ptr[1] = (src_ptr[3] + src_ptr[4] + src_ptr[5] +
|
|
src_ptr[stride + 3] + src_ptr[stride + 4] +
|
|
src_ptr[stride + 5]) * (65536 / 6) >> 16;
|
|
dst_ptr[2] = (src_ptr[6] + src_ptr[7] +
|
|
src_ptr[stride + 6] + src_ptr[stride + 7]) *
|
|
(65536 / 4) >> 16;
|
|
src_ptr += 8;
|
|
dst_ptr += 3;
|
|
}
|
|
}
|
|
|
|
void ScaleRowDown38_2_Box_16_C(const uint16* src_ptr, ptrdiff_t src_stride,
|
|
uint16* dst_ptr, int dst_width) {
|
|
intptr_t stride = src_stride;
|
|
int i;
|
|
assert((dst_width % 3 == 0) && (dst_width > 0));
|
|
for (i = 0; i < dst_width; i += 3) {
|
|
dst_ptr[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] +
|
|
src_ptr[stride + 0] + src_ptr[stride + 1] +
|
|
src_ptr[stride + 2]) * (65536 / 6) >> 16;
|
|
dst_ptr[1] = (src_ptr[3] + src_ptr[4] + src_ptr[5] +
|
|
src_ptr[stride + 3] + src_ptr[stride + 4] +
|
|
src_ptr[stride + 5]) * (65536 / 6) >> 16;
|
|
dst_ptr[2] = (src_ptr[6] + src_ptr[7] +
|
|
src_ptr[stride + 6] + src_ptr[stride + 7]) *
|
|
(65536 / 4) >> 16;
|
|
src_ptr += 8;
|
|
dst_ptr += 3;
|
|
}
|
|
}
|
|
|
|
void ScaleAddRow_C(const uint8* src_ptr, uint16* dst_ptr, int src_width) {
|
|
int x;
|
|
assert(src_width > 0);
|
|
for (x = 0; x < src_width - 1; x += 2) {
|
|
dst_ptr[0] += src_ptr[0];
|
|
dst_ptr[1] += src_ptr[1];
|
|
src_ptr += 2;
|
|
dst_ptr += 2;
|
|
}
|
|
if (src_width & 1) {
|
|
dst_ptr[0] += src_ptr[0];
|
|
}
|
|
}
|
|
|
|
void ScaleAddRow_16_C(const uint16* src_ptr, uint32* dst_ptr, int src_width) {
|
|
int x;
|
|
assert(src_width > 0);
|
|
for (x = 0; x < src_width - 1; x += 2) {
|
|
dst_ptr[0] += src_ptr[0];
|
|
dst_ptr[1] += src_ptr[1];
|
|
src_ptr += 2;
|
|
dst_ptr += 2;
|
|
}
|
|
if (src_width & 1) {
|
|
dst_ptr[0] += src_ptr[0];
|
|
}
|
|
}
|
|
|
|
void ScaleARGBRowDown2_C(const uint8* src_argb,
|
|
ptrdiff_t src_stride,
|
|
uint8* dst_argb, int dst_width) {
|
|
const uint32* src = (const uint32*)(src_argb);
|
|
uint32* dst = (uint32*)(dst_argb);
|
|
|
|
int x;
|
|
for (x = 0; x < dst_width - 1; x += 2) {
|
|
dst[0] = src[1];
|
|
dst[1] = src[3];
|
|
src += 4;
|
|
dst += 2;
|
|
}
|
|
if (dst_width & 1) {
|
|
dst[0] = src[1];
|
|
}
|
|
}
|
|
|
|
void ScaleARGBRowDown2Linear_C(const uint8* src_argb,
|
|
ptrdiff_t src_stride,
|
|
uint8* dst_argb, int dst_width) {
|
|
int x;
|
|
for (x = 0; x < dst_width; ++x) {
|
|
dst_argb[0] = (src_argb[0] + src_argb[4] + 1) >> 1;
|
|
dst_argb[1] = (src_argb[1] + src_argb[5] + 1) >> 1;
|
|
dst_argb[2] = (src_argb[2] + src_argb[6] + 1) >> 1;
|
|
dst_argb[3] = (src_argb[3] + src_argb[7] + 1) >> 1;
|
|
src_argb += 8;
|
|
dst_argb += 4;
|
|
}
|
|
}
|
|
|
|
void ScaleARGBRowDown2Box_C(const uint8* src_argb, ptrdiff_t src_stride,
|
|
uint8* dst_argb, int dst_width) {
|
|
int x;
|
|
for (x = 0; x < dst_width; ++x) {
|
|
dst_argb[0] = (src_argb[0] + src_argb[4] +
|
|
src_argb[src_stride] + src_argb[src_stride + 4] + 2) >> 2;
|
|
dst_argb[1] = (src_argb[1] + src_argb[5] +
|
|
src_argb[src_stride + 1] + src_argb[src_stride + 5] + 2) >> 2;
|
|
dst_argb[2] = (src_argb[2] + src_argb[6] +
|
|
src_argb[src_stride + 2] + src_argb[src_stride + 6] + 2) >> 2;
|
|
dst_argb[3] = (src_argb[3] + src_argb[7] +
|
|
src_argb[src_stride + 3] + src_argb[src_stride + 7] + 2) >> 2;
|
|
src_argb += 8;
|
|
dst_argb += 4;
|
|
}
|
|
}
|
|
|
|
void ScaleARGBRowDownEven_C(const uint8* src_argb, ptrdiff_t src_stride,
|
|
int src_stepx,
|
|
uint8* dst_argb, int dst_width) {
|
|
const uint32* src = (const uint32*)(src_argb);
|
|
uint32* dst = (uint32*)(dst_argb);
|
|
|
|
int x;
|
|
for (x = 0; x < dst_width - 1; x += 2) {
|
|
dst[0] = src[0];
|
|
dst[1] = src[src_stepx];
|
|
src += src_stepx * 2;
|
|
dst += 2;
|
|
}
|
|
if (dst_width & 1) {
|
|
dst[0] = src[0];
|
|
}
|
|
}
|
|
|
|
void ScaleARGBRowDownEvenBox_C(const uint8* src_argb,
|
|
ptrdiff_t src_stride,
|
|
int src_stepx,
|
|
uint8* dst_argb, int dst_width) {
|
|
int x;
|
|
for (x = 0; x < dst_width; ++x) {
|
|
dst_argb[0] = (src_argb[0] + src_argb[4] +
|
|
src_argb[src_stride] + src_argb[src_stride + 4] + 2) >> 2;
|
|
dst_argb[1] = (src_argb[1] + src_argb[5] +
|
|
src_argb[src_stride + 1] + src_argb[src_stride + 5] + 2) >> 2;
|
|
dst_argb[2] = (src_argb[2] + src_argb[6] +
|
|
src_argb[src_stride + 2] + src_argb[src_stride + 6] + 2) >> 2;
|
|
dst_argb[3] = (src_argb[3] + src_argb[7] +
|
|
src_argb[src_stride + 3] + src_argb[src_stride + 7] + 2) >> 2;
|
|
src_argb += src_stepx * 4;
|
|
dst_argb += 4;
|
|
}
|
|
}
|
|
|
|
// Scales a single row of pixels using point sampling.
|
|
void ScaleARGBCols_C(uint8* dst_argb, const uint8* src_argb,
|
|
int dst_width, int x, int dx) {
|
|
const uint32* src = (const uint32*)(src_argb);
|
|
uint32* dst = (uint32*)(dst_argb);
|
|
int j;
|
|
for (j = 0; j < dst_width - 1; j += 2) {
|
|
dst[0] = src[x >> 16];
|
|
x += dx;
|
|
dst[1] = src[x >> 16];
|
|
x += dx;
|
|
dst += 2;
|
|
}
|
|
if (dst_width & 1) {
|
|
dst[0] = src[x >> 16];
|
|
}
|
|
}
|
|
|
|
void ScaleARGBCols64_C(uint8* dst_argb, const uint8* src_argb,
|
|
int dst_width, int x32, int dx) {
|
|
int64 x = (int64)(x32);
|
|
const uint32* src = (const uint32*)(src_argb);
|
|
uint32* dst = (uint32*)(dst_argb);
|
|
int j;
|
|
for (j = 0; j < dst_width - 1; j += 2) {
|
|
dst[0] = src[x >> 16];
|
|
x += dx;
|
|
dst[1] = src[x >> 16];
|
|
x += dx;
|
|
dst += 2;
|
|
}
|
|
if (dst_width & 1) {
|
|
dst[0] = src[x >> 16];
|
|
}
|
|
}
|
|
|
|
// Scales a single row of pixels up by 2x using point sampling.
|
|
void ScaleARGBColsUp2_C(uint8* dst_argb, const uint8* src_argb,
|
|
int dst_width, int x, int dx) {
|
|
const uint32* src = (const uint32*)(src_argb);
|
|
uint32* dst = (uint32*)(dst_argb);
|
|
int j;
|
|
for (j = 0; j < dst_width - 1; j += 2) {
|
|
dst[1] = dst[0] = src[0];
|
|
src += 1;
|
|
dst += 2;
|
|
}
|
|
if (dst_width & 1) {
|
|
dst[0] = src[0];
|
|
}
|
|
}
|
|
|
|
// Mimics SSSE3 blender
|
|
#define BLENDER1(a, b, f) ((a) * (0x7f ^ f) + (b) * f) >> 7
|
|
#define BLENDERC(a, b, f, s) (uint32)( \
|
|
BLENDER1(((a) >> s) & 255, ((b) >> s) & 255, f) << s)
|
|
#define BLENDER(a, b, f) \
|
|
BLENDERC(a, b, f, 24) | BLENDERC(a, b, f, 16) | \
|
|
BLENDERC(a, b, f, 8) | BLENDERC(a, b, f, 0)
|
|
|
|
void ScaleARGBFilterCols_C(uint8* dst_argb, const uint8* src_argb,
|
|
int dst_width, int x, int dx) {
|
|
const uint32* src = (const uint32*)(src_argb);
|
|
uint32* dst = (uint32*)(dst_argb);
|
|
int j;
|
|
for (j = 0; j < dst_width - 1; j += 2) {
|
|
int xi = x >> 16;
|
|
int xf = (x >> 9) & 0x7f;
|
|
uint32 a = src[xi];
|
|
uint32 b = src[xi + 1];
|
|
dst[0] = BLENDER(a, b, xf);
|
|
x += dx;
|
|
xi = x >> 16;
|
|
xf = (x >> 9) & 0x7f;
|
|
a = src[xi];
|
|
b = src[xi + 1];
|
|
dst[1] = BLENDER(a, b, xf);
|
|
x += dx;
|
|
dst += 2;
|
|
}
|
|
if (dst_width & 1) {
|
|
int xi = x >> 16;
|
|
int xf = (x >> 9) & 0x7f;
|
|
uint32 a = src[xi];
|
|
uint32 b = src[xi + 1];
|
|
dst[0] = BLENDER(a, b, xf);
|
|
}
|
|
}
|
|
|
|
void ScaleARGBFilterCols64_C(uint8* dst_argb, const uint8* src_argb,
|
|
int dst_width, int x32, int dx) {
|
|
int64 x = (int64)(x32);
|
|
const uint32* src = (const uint32*)(src_argb);
|
|
uint32* dst = (uint32*)(dst_argb);
|
|
int j;
|
|
for (j = 0; j < dst_width - 1; j += 2) {
|
|
int64 xi = x >> 16;
|
|
int xf = (x >> 9) & 0x7f;
|
|
uint32 a = src[xi];
|
|
uint32 b = src[xi + 1];
|
|
dst[0] = BLENDER(a, b, xf);
|
|
x += dx;
|
|
xi = x >> 16;
|
|
xf = (x >> 9) & 0x7f;
|
|
a = src[xi];
|
|
b = src[xi + 1];
|
|
dst[1] = BLENDER(a, b, xf);
|
|
x += dx;
|
|
dst += 2;
|
|
}
|
|
if (dst_width & 1) {
|
|
int64 xi = x >> 16;
|
|
int xf = (x >> 9) & 0x7f;
|
|
uint32 a = src[xi];
|
|
uint32 b = src[xi + 1];
|
|
dst[0] = BLENDER(a, b, xf);
|
|
}
|
|
}
|
|
#undef BLENDER1
|
|
#undef BLENDERC
|
|
#undef BLENDER
|
|
|
|
// Scale plane vertically with bilinear interpolation.
|
|
void ScalePlaneVertical(int src_height,
|
|
int dst_width, int dst_height,
|
|
int src_stride, int dst_stride,
|
|
const uint8* src_argb, uint8* dst_argb,
|
|
int x, int y, int dy,
|
|
int bpp, enum FilterMode filtering) {
|
|
// TODO(fbarchard): Allow higher bpp.
|
|
int dst_width_bytes = dst_width * bpp;
|
|
void (*InterpolateRow)(uint8* dst_argb, const uint8* src_argb,
|
|
ptrdiff_t src_stride, int dst_width, int source_y_fraction) =
|
|
InterpolateRow_C;
|
|
const int max_y = (src_height > 1) ? ((src_height - 1) << 16) - 1 : 0;
|
|
int j;
|
|
assert(bpp >= 1 && bpp <= 4);
|
|
assert(src_height != 0);
|
|
assert(dst_width > 0);
|
|
assert(dst_height > 0);
|
|
src_argb += (x >> 16) * bpp;
|
|
#if defined(HAS_INTERPOLATEROW_SSE2)
|
|
if (TestCpuFlag(kCpuHasSSE2)) {
|
|
InterpolateRow = InterpolateRow_Any_SSE2;
|
|
if (IS_ALIGNED(dst_width_bytes, 16)) {
|
|
InterpolateRow = InterpolateRow_SSE2;
|
|
}
|
|
}
|
|
#endif
|
|
#if defined(HAS_INTERPOLATEROW_SSSE3)
|
|
if (TestCpuFlag(kCpuHasSSSE3)) {
|
|
InterpolateRow = InterpolateRow_Any_SSSE3;
|
|
if (IS_ALIGNED(dst_width_bytes, 16)) {
|
|
InterpolateRow = InterpolateRow_SSSE3;
|
|
}
|
|
}
|
|
#endif
|
|
#if defined(HAS_INTERPOLATEROW_AVX2)
|
|
if (TestCpuFlag(kCpuHasAVX2)) {
|
|
InterpolateRow = InterpolateRow_Any_AVX2;
|
|
if (IS_ALIGNED(dst_width_bytes, 32)) {
|
|
InterpolateRow = InterpolateRow_AVX2;
|
|
}
|
|
}
|
|
#endif
|
|
#if defined(HAS_INTERPOLATEROW_NEON)
|
|
if (TestCpuFlag(kCpuHasNEON)) {
|
|
InterpolateRow = InterpolateRow_Any_NEON;
|
|
if (IS_ALIGNED(dst_width_bytes, 16)) {
|
|
InterpolateRow = InterpolateRow_NEON;
|
|
}
|
|
}
|
|
#endif
|
|
#if defined(HAS_INTERPOLATEROW_MIPS_DSPR2)
|
|
if (TestCpuFlag(kCpuHasMIPS_DSPR2) &&
|
|
IS_ALIGNED(src_argb, 4) && IS_ALIGNED(src_stride, 4) &&
|
|
IS_ALIGNED(dst_argb, 4) && IS_ALIGNED(dst_stride, 4)) {
|
|
InterpolateRow = InterpolateRow_Any_MIPS_DSPR2;
|
|
if (IS_ALIGNED(dst_width_bytes, 4)) {
|
|
InterpolateRow = InterpolateRow_MIPS_DSPR2;
|
|
}
|
|
}
|
|
#endif
|
|
for (j = 0; j < dst_height; ++j) {
|
|
int yi;
|
|
int yf;
|
|
if (y > max_y) {
|
|
y = max_y;
|
|
}
|
|
yi = y >> 16;
|
|
yf = filtering ? ((y >> 8) & 255) : 0;
|
|
InterpolateRow(dst_argb, src_argb + yi * src_stride,
|
|
src_stride, dst_width_bytes, yf);
|
|
dst_argb += dst_stride;
|
|
y += dy;
|
|
}
|
|
}
|
|
void ScalePlaneVertical_16(int src_height,
|
|
int dst_width, int dst_height,
|
|
int src_stride, int dst_stride,
|
|
const uint16* src_argb, uint16* dst_argb,
|
|
int x, int y, int dy,
|
|
int wpp, enum FilterMode filtering) {
|
|
// TODO(fbarchard): Allow higher wpp.
|
|
int dst_width_words = dst_width * wpp;
|
|
void (*InterpolateRow)(uint16* dst_argb, const uint16* src_argb,
|
|
ptrdiff_t src_stride, int dst_width, int source_y_fraction) =
|
|
InterpolateRow_16_C;
|
|
const int max_y = (src_height > 1) ? ((src_height - 1) << 16) - 1 : 0;
|
|
int j;
|
|
assert(wpp >= 1 && wpp <= 2);
|
|
assert(src_height != 0);
|
|
assert(dst_width > 0);
|
|
assert(dst_height > 0);
|
|
src_argb += (x >> 16) * wpp;
|
|
#if defined(HAS_INTERPOLATEROW_16_SSE2)
|
|
if (TestCpuFlag(kCpuHasSSE2)) {
|
|
InterpolateRow = InterpolateRow_Any_16_SSE2;
|
|
if (IS_ALIGNED(dst_width_bytes, 16)) {
|
|
InterpolateRow = InterpolateRow_16_SSE2;
|
|
}
|
|
}
|
|
#endif
|
|
#if defined(HAS_INTERPOLATEROW_16_SSSE3)
|
|
if (TestCpuFlag(kCpuHasSSSE3)) {
|
|
InterpolateRow = InterpolateRow_Any_16_SSSE3;
|
|
if (IS_ALIGNED(dst_width_bytes, 16)) {
|
|
InterpolateRow = InterpolateRow_16_SSSE3;
|
|
}
|
|
}
|
|
#endif
|
|
#if defined(HAS_INTERPOLATEROW_16_AVX2)
|
|
if (TestCpuFlag(kCpuHasAVX2)) {
|
|
InterpolateRow = InterpolateRow_Any_16_AVX2;
|
|
if (IS_ALIGNED(dst_width_bytes, 32)) {
|
|
InterpolateRow = InterpolateRow_16_AVX2;
|
|
}
|
|
}
|
|
#endif
|
|
#if defined(HAS_INTERPOLATEROW_16_NEON)
|
|
if (TestCpuFlag(kCpuHasNEON)) {
|
|
InterpolateRow = InterpolateRow_Any_16_NEON;
|
|
if (IS_ALIGNED(dst_width_bytes, 16)) {
|
|
InterpolateRow = InterpolateRow_16_NEON;
|
|
}
|
|
}
|
|
#endif
|
|
#if defined(HAS_INTERPOLATEROW_16_MIPS_DSPR2)
|
|
if (TestCpuFlag(kCpuHasMIPS_DSPR2) &&
|
|
IS_ALIGNED(src_argb, 4) && IS_ALIGNED(src_stride, 4) &&
|
|
IS_ALIGNED(dst_argb, 4) && IS_ALIGNED(dst_stride, 4)) {
|
|
InterpolateRow = InterpolateRow_Any_16_MIPS_DSPR2;
|
|
if (IS_ALIGNED(dst_width_bytes, 4)) {
|
|
InterpolateRow = InterpolateRow_16_MIPS_DSPR2;
|
|
}
|
|
}
|
|
#endif
|
|
for (j = 0; j < dst_height; ++j) {
|
|
int yi;
|
|
int yf;
|
|
if (y > max_y) {
|
|
y = max_y;
|
|
}
|
|
yi = y >> 16;
|
|
yf = filtering ? ((y >> 8) & 255) : 0;
|
|
InterpolateRow(dst_argb, src_argb + yi * src_stride,
|
|
src_stride, dst_width_words, yf);
|
|
dst_argb += dst_stride;
|
|
y += dy;
|
|
}
|
|
}
|
|
|
|
// Simplify the filtering based on scale factors.
|
|
enum FilterMode ScaleFilterReduce(int src_width, int src_height,
|
|
int dst_width, int dst_height,
|
|
enum FilterMode filtering) {
|
|
if (src_width < 0) {
|
|
src_width = -src_width;
|
|
}
|
|
if (src_height < 0) {
|
|
src_height = -src_height;
|
|
}
|
|
if (filtering == kFilterBox) {
|
|
// If scaling both axis to 0.5 or larger, switch from Box to Bilinear.
|
|
if (dst_width * 2 >= src_width && dst_height * 2 >= src_height) {
|
|
filtering = kFilterBilinear;
|
|
}
|
|
}
|
|
if (filtering == kFilterBilinear) {
|
|
if (src_height == 1) {
|
|
filtering = kFilterLinear;
|
|
}
|
|
// TODO(fbarchard): Detect any odd scale factor and reduce to Linear.
|
|
if (dst_height == src_height || dst_height * 3 == src_height) {
|
|
filtering = kFilterLinear;
|
|
}
|
|
// TODO(fbarchard): Remove 1 pixel wide filter restriction, which is to
|
|
// avoid reading 2 pixels horizontally that causes memory exception.
|
|
if (src_width == 1) {
|
|
filtering = kFilterNone;
|
|
}
|
|
}
|
|
if (filtering == kFilterLinear) {
|
|
if (src_width == 1) {
|
|
filtering = kFilterNone;
|
|
}
|
|
// TODO(fbarchard): Detect any odd scale factor and reduce to None.
|
|
if (dst_width == src_width || dst_width * 3 == src_width) {
|
|
filtering = kFilterNone;
|
|
}
|
|
}
|
|
return filtering;
|
|
}
|
|
|
|
// Divide num by div and return as 16.16 fixed point result.
|
|
int FixedDiv_C(int num, int div) {
|
|
return (int)(((int64)(num) << 16) / div);
|
|
}
|
|
|
|
// Divide num by div and return as 16.16 fixed point result.
|
|
int FixedDiv1_C(int num, int div) {
|
|
return (int)((((int64)(num) << 16) - 0x00010001) /
|
|
(div - 1));
|
|
}
|
|
|
|
#define CENTERSTART(dx, s) (dx < 0) ? -((-dx >> 1) + s) : ((dx >> 1) + s)
|
|
|
|
// Compute slope values for stepping.
|
|
void ScaleSlope(int src_width, int src_height,
|
|
int dst_width, int dst_height,
|
|
enum FilterMode filtering,
|
|
int* x, int* y, int* dx, int* dy) {
|
|
assert(x != NULL);
|
|
assert(y != NULL);
|
|
assert(dx != NULL);
|
|
assert(dy != NULL);
|
|
assert(src_width != 0);
|
|
assert(src_height != 0);
|
|
assert(dst_width > 0);
|
|
assert(dst_height > 0);
|
|
// Check for 1 pixel and avoid FixedDiv overflow.
|
|
if (dst_width == 1 && src_width >= 32768) {
|
|
dst_width = src_width;
|
|
}
|
|
if (dst_height == 1 && src_height >= 32768) {
|
|
dst_height = src_height;
|
|
}
|
|
if (filtering == kFilterBox) {
|
|
// Scale step for point sampling duplicates all pixels equally.
|
|
*dx = FixedDiv(Abs(src_width), dst_width);
|
|
*dy = FixedDiv(src_height, dst_height);
|
|
*x = 0;
|
|
*y = 0;
|
|
} else if (filtering == kFilterBilinear) {
|
|
// Scale step for bilinear sampling renders last pixel once for upsample.
|
|
if (dst_width <= Abs(src_width)) {
|
|
*dx = FixedDiv(Abs(src_width), dst_width);
|
|
*x = CENTERSTART(*dx, -32768); // Subtract 0.5 (32768) to center filter.
|
|
} else if (dst_width > 1) {
|
|
*dx = FixedDiv1(Abs(src_width), dst_width);
|
|
*x = 0;
|
|
}
|
|
if (dst_height <= src_height) {
|
|
*dy = FixedDiv(src_height, dst_height);
|
|
*y = CENTERSTART(*dy, -32768); // Subtract 0.5 (32768) to center filter.
|
|
} else if (dst_height > 1) {
|
|
*dy = FixedDiv1(src_height, dst_height);
|
|
*y = 0;
|
|
}
|
|
} else if (filtering == kFilterLinear) {
|
|
// Scale step for bilinear sampling renders last pixel once for upsample.
|
|
if (dst_width <= Abs(src_width)) {
|
|
*dx = FixedDiv(Abs(src_width), dst_width);
|
|
*x = CENTERSTART(*dx, -32768); // Subtract 0.5 (32768) to center filter.
|
|
} else if (dst_width > 1) {
|
|
*dx = FixedDiv1(Abs(src_width), dst_width);
|
|
*x = 0;
|
|
}
|
|
*dy = FixedDiv(src_height, dst_height);
|
|
*y = *dy >> 1;
|
|
} else {
|
|
// Scale step for point sampling duplicates all pixels equally.
|
|
*dx = FixedDiv(Abs(src_width), dst_width);
|
|
*dy = FixedDiv(src_height, dst_height);
|
|
*x = CENTERSTART(*dx, 0);
|
|
*y = CENTERSTART(*dy, 0);
|
|
}
|
|
// Negative src_width means horizontally mirror.
|
|
if (src_width < 0) {
|
|
*x += (dst_width - 1) * *dx;
|
|
*dx = -*dx;
|
|
// src_width = -src_width; // Caller must do this.
|
|
}
|
|
}
|
|
#undef CENTERSTART
|
|
|
|
#ifdef __cplusplus
|
|
} // extern "C"
|
|
} // namespace libyuv
|
|
#endif
|