| /* |
| * Copyright 2013 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/scale.h" |
| |
| #include <assert.h> |
| #include <string.h> |
| |
| #include "libyuv/cpu_id.h" |
| #include "libyuv/planar_functions.h" // For CopyARGB |
| #include "libyuv/row.h" |
| #include "libyuv/scale_row.h" |
| |
| #ifdef __cplusplus |
| namespace libyuv { |
| extern "C" { |
| #endif |
| |
| static __inline int Abs(int v) { |
| return v >= 0 ? v : -v; |
| } |
| |
| // CPU agnostic row functions |
| void ScaleRowDown2_C(const uint8* src_ptr, ptrdiff_t src_stride, |
| uint8* dst, int dst_width) { |
| int x; |
| for (x = 0; x < dst_width - 1; x += 2) { |
| dst[0] = src_ptr[1]; |
| dst[1] = src_ptr[3]; |
| dst += 2; |
| src_ptr += 4; |
| } |
| if (dst_width & 1) { |
| dst[0] = src_ptr[1]; |
| } |
| } |
| |
| void ScaleRowDown2_16_C(const uint16* src_ptr, ptrdiff_t src_stride, |
| uint16* dst, int dst_width) { |
| int x; |
| for (x = 0; x < dst_width - 1; x += 2) { |
| dst[0] = src_ptr[1]; |
| dst[1] = src_ptr[3]; |
| dst += 2; |
| src_ptr += 4; |
| } |
| if (dst_width & 1) { |
| dst[0] = src_ptr[1]; |
| } |
| } |
| |
| void ScaleRowDown2Linear_C(const uint8* src_ptr, ptrdiff_t src_stride, |
| uint8* dst, int dst_width) { |
| const uint8* s = src_ptr; |
| int x; |
| for (x = 0; x < dst_width - 1; x += 2) { |
| dst[0] = (s[0] + s[1] + 1) >> 1; |
| dst[1] = (s[2] + s[3] + 1) >> 1; |
| dst += 2; |
| s += 4; |
| } |
| if (dst_width & 1) { |
| dst[0] = (s[0] + s[1] + 1) >> 1; |
| } |
| } |
| |
| void ScaleRowDown2Linear_16_C(const uint16* src_ptr, ptrdiff_t src_stride, |
| uint16* dst, int dst_width) { |
| const uint16* s = src_ptr; |
| int x; |
| for (x = 0; x < dst_width - 1; x += 2) { |
| dst[0] = (s[0] + s[1] + 1) >> 1; |
| dst[1] = (s[2] + s[3] + 1) >> 1; |
| dst += 2; |
| s += 4; |
| } |
| if (dst_width & 1) { |
| dst[0] = (s[0] + s[1] + 1) >> 1; |
| } |
| } |
| |
| void ScaleRowDown2Box_C(const uint8* src_ptr, ptrdiff_t src_stride, |
| uint8* dst, int dst_width) { |
| const uint8* s = src_ptr; |
| const uint8* t = src_ptr + src_stride; |
| int x; |
| for (x = 0; x < dst_width - 1; x += 2) { |
| dst[0] = (s[0] + s[1] + t[0] + t[1] + 2) >> 2; |
| dst[1] = (s[2] + s[3] + t[2] + t[3] + 2) >> 2; |
| dst += 2; |
| s += 4; |
| t += 4; |
| } |
| if (dst_width & 1) { |
| dst[0] = (s[0] + s[1] + t[0] + t[1] + 2) >> 2; |
| } |
| } |
| |
| void ScaleRowDown2Box_16_C(const uint16* src_ptr, ptrdiff_t src_stride, |
| uint16* dst, int dst_width) { |
| const uint16* s = src_ptr; |
| const uint16* t = src_ptr + src_stride; |
| int x; |
| for (x = 0; x < dst_width - 1; x += 2) { |
| dst[0] = (s[0] + s[1] + t[0] + t[1] + 2) >> 2; |
| dst[1] = (s[2] + s[3] + t[2] + t[3] + 2) >> 2; |
| dst += 2; |
| s += 4; |
| t += 4; |
| } |
| if (dst_width & 1) { |
| dst[0] = (s[0] + s[1] + t[0] + t[1] + 2) >> 2; |
| } |
| } |
| |
| void ScaleRowDown4_C(const uint8* src_ptr, ptrdiff_t src_stride, |
| uint8* dst, int dst_width) { |
| int x; |
| for (x = 0; x < dst_width - 1; x += 2) { |
| dst[0] = src_ptr[2]; |
| dst[1] = src_ptr[6]; |
| dst += 2; |
| src_ptr += 8; |
| } |
| if (dst_width & 1) { |
| dst[0] = src_ptr[2]; |
| } |
| } |
| |
| void ScaleRowDown4_16_C(const uint16* src_ptr, ptrdiff_t src_stride, |
| uint16* dst, int dst_width) { |
| int x; |
| for (x = 0; x < dst_width - 1; x += 2) { |
| dst[0] = src_ptr[2]; |
| dst[1] = src_ptr[6]; |
| dst += 2; |
| src_ptr += 8; |
| } |
| if (dst_width & 1) { |
| dst[0] = src_ptr[2]; |
| } |
| } |
| |
| void ScaleRowDown4Box_C(const uint8* src_ptr, ptrdiff_t src_stride, |
| uint8* dst, int dst_width) { |
| intptr_t stride = src_stride; |
| int x; |
| for (x = 0; x < dst_width - 1; x += 2) { |
| dst[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[3] + |
| src_ptr[stride + 0] + src_ptr[stride + 1] + |
| src_ptr[stride + 2] + src_ptr[stride + 3] + |
| src_ptr[stride * 2 + 0] + src_ptr[stride * 2 + 1] + |
| src_ptr[stride * 2 + 2] + src_ptr[stride * 2 + 3] + |
| src_ptr[stride * 3 + 0] + src_ptr[stride * 3 + 1] + |
| src_ptr[stride * 3 + 2] + src_ptr[stride * 3 + 3] + |
| 8) >> 4; |
| dst[1] = (src_ptr[4] + src_ptr[5] + src_ptr[6] + src_ptr[7] + |
| src_ptr[stride + 4] + src_ptr[stride + 5] + |
| src_ptr[stride + 6] + src_ptr[stride + 7] + |
| src_ptr[stride * 2 + 4] + src_ptr[stride * 2 + 5] + |
| src_ptr[stride * 2 + 6] + src_ptr[stride * 2 + 7] + |
| src_ptr[stride * 3 + 4] + src_ptr[stride * 3 + 5] + |
| src_ptr[stride * 3 + 6] + src_ptr[stride * 3 + 7] + |
| 8) >> 4; |
| dst += 2; |
| src_ptr += 8; |
| } |
| if (dst_width & 1) { |
| dst[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[3] + |
| src_ptr[stride + 0] + src_ptr[stride + 1] + |
| src_ptr[stride + 2] + src_ptr[stride + 3] + |
| src_ptr[stride * 2 + 0] + src_ptr[stride * 2 + 1] + |
| src_ptr[stride * 2 + 2] + src_ptr[stride * 2 + 3] + |
| src_ptr[stride * 3 + 0] + src_ptr[stride * 3 + 1] + |
| src_ptr[stride * 3 + 2] + src_ptr[stride * 3 + 3] + |
| 8) >> 4; |
| } |
| } |
| |
| void ScaleRowDown4Box_16_C(const uint16* src_ptr, ptrdiff_t src_stride, |
| uint16* dst, int dst_width) { |
| intptr_t stride = src_stride; |
| int x; |
| for (x = 0; x < dst_width - 1; x += 2) { |
| dst[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[3] + |
| src_ptr[stride + 0] + src_ptr[stride + 1] + |
| src_ptr[stride + 2] + src_ptr[stride + 3] + |
| src_ptr[stride * 2 + 0] + src_ptr[stride * 2 + 1] + |
| src_ptr[stride * 2 + 2] + src_ptr[stride * 2 + 3] + |
| src_ptr[stride * 3 + 0] + src_ptr[stride * 3 + 1] + |
| src_ptr[stride * 3 + 2] + src_ptr[stride * 3 + 3] + |
| 8) >> 4; |
| dst[1] = (src_ptr[4] + src_ptr[5] + src_ptr[6] + src_ptr[7] + |
| src_ptr[stride + 4] + src_ptr[stride + 5] + |
| src_ptr[stride + 6] + src_ptr[stride + 7] + |
| src_ptr[stride * 2 + 4] + src_ptr[stride * 2 + 5] + |
| src_ptr[stride * 2 + 6] + src_ptr[stride * 2 + 7] + |
| src_ptr[stride * 3 + 4] + src_ptr[stride * 3 + 5] + |
| src_ptr[stride * 3 + 6] + src_ptr[stride * 3 + 7] + |
| 8) >> 4; |
| dst += 2; |
| src_ptr += 8; |
| } |
| if (dst_width & 1) { |
| dst[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[3] + |
| src_ptr[stride + 0] + src_ptr[stride + 1] + |
| src_ptr[stride + 2] + src_ptr[stride + 3] + |
| src_ptr[stride * 2 + 0] + src_ptr[stride * 2 + 1] + |
| src_ptr[stride * 2 + 2] + src_ptr[stride * 2 + 3] + |
| src_ptr[stride * 3 + 0] + src_ptr[stride * 3 + 1] + |
| src_ptr[stride * 3 + 2] + src_ptr[stride * 3 + 3] + |
| 8) >> 4; |
| } |
| } |
| |
| void ScaleRowDown34_C(const uint8* src_ptr, ptrdiff_t src_stride, |
| uint8* dst, int dst_width) { |
| int x; |
| assert((dst_width % 3 == 0) && (dst_width > 0)); |
| for (x = 0; x < dst_width; x += 3) { |
| dst[0] = src_ptr[0]; |
| dst[1] = src_ptr[1]; |
| dst[2] = src_ptr[3]; |
| dst += 3; |
| src_ptr += 4; |
| } |
| } |
| |
| void ScaleRowDown34_16_C(const uint16* src_ptr, ptrdiff_t src_stride, |
| uint16* dst, int dst_width) { |
| int x; |
| assert((dst_width % 3 == 0) && (dst_width > 0)); |
| for (x = 0; x < dst_width; x += 3) { |
| dst[0] = src_ptr[0]; |
| dst[1] = src_ptr[1]; |
| dst[2] = src_ptr[3]; |
| dst += 3; |
| src_ptr += 4; |
| } |
| } |
| |
| // Filter rows 0 and 1 together, 3 : 1 |
| void ScaleRowDown34_0_Box_C(const uint8* src_ptr, ptrdiff_t src_stride, |
| uint8* d, int dst_width) { |
| const uint8* s = src_ptr; |
| const uint8* t = src_ptr + src_stride; |
| int x; |
| assert((dst_width % 3 == 0) && (dst_width > 0)); |
| for (x = 0; x < dst_width; x += 3) { |
| uint8 a0 = (s[0] * 3 + s[1] * 1 + 2) >> 2; |
| uint8 a1 = (s[1] * 1 + s[2] * 1 + 1) >> 1; |
| uint8 a2 = (s[2] * 1 + s[3] * 3 + 2) >> 2; |
| uint8 b0 = (t[0] * 3 + t[1] * 1 + 2) >> 2; |
| uint8 b1 = (t[1] * 1 + t[2] * 1 + 1) >> 1; |
| uint8 b2 = (t[2] * 1 + t[3] * 3 + 2) >> 2; |
| d[0] = (a0 * 3 + b0 + 2) >> 2; |
| d[1] = (a1 * 3 + b1 + 2) >> 2; |
| d[2] = (a2 * 3 + b2 + 2) >> 2; |
| d += 3; |
| s += 4; |
| t += 4; |
| } |
| } |
| |
| void ScaleRowDown34_0_Box_16_C(const uint16* src_ptr, ptrdiff_t src_stride, |
| uint16* d, int dst_width) { |
| const uint16* s = src_ptr; |
| const uint16* t = src_ptr + src_stride; |
| int x; |
| assert((dst_width % 3 == 0) && (dst_width > 0)); |
| for (x = 0; x < dst_width; x += 3) { |
| uint16 a0 = (s[0] * 3 + s[1] * 1 + 2) >> 2; |
| uint16 a1 = (s[1] * 1 + s[2] * 1 + 1) >> 1; |
| uint16 a2 = (s[2] * 1 + s[3] * 3 + 2) >> 2; |
| uint16 b0 = (t[0] * 3 + t[1] * 1 + 2) >> 2; |
| uint16 b1 = (t[1] * 1 + t[2] * 1 + 1) >> 1; |
| uint16 b2 = (t[2] * 1 + t[3] * 3 + 2) >> 2; |
| d[0] = (a0 * 3 + b0 + 2) >> 2; |
| d[1] = (a1 * 3 + b1 + 2) >> 2; |
| d[2] = (a2 * 3 + b2 + 2) >> 2; |
| d += 3; |
| s += 4; |
| t += 4; |
| } |
| } |
| |
| // Filter rows 1 and 2 together, 1 : 1 |
| void ScaleRowDown34_1_Box_C(const uint8* src_ptr, ptrdiff_t src_stride, |
| uint8* d, int dst_width) { |
| const uint8* s = src_ptr; |
| const uint8* t = src_ptr + src_stride; |
| int x; |
| assert((dst_width % 3 == 0) && (dst_width > 0)); |
| for (x = 0; x < dst_width; x += 3) { |
| uint8 a0 = (s[0] * 3 + s[1] * 1 + 2) >> 2; |
| uint8 a1 = (s[1] * 1 + s[2] * 1 + 1) >> 1; |
| uint8 a2 = (s[2] * 1 + s[3] * 3 + 2) >> 2; |
| uint8 b0 = (t[0] * 3 + t[1] * 1 + 2) >> 2; |
| uint8 b1 = (t[1] * 1 + t[2] * 1 + 1) >> 1; |
| uint8 b2 = (t[2] * 1 + t[3] * 3 + 2) >> 2; |
| d[0] = (a0 + b0 + 1) >> 1; |
| d[1] = (a1 + b1 + 1) >> 1; |
| d[2] = (a2 + b2 + 1) >> 1; |
| d += 3; |
| s += 4; |
| t += 4; |
| } |
| } |
| |
| void ScaleRowDown34_1_Box_16_C(const uint16* src_ptr, ptrdiff_t src_stride, |
| uint16* d, int dst_width) { |
| const uint16* s = src_ptr; |
| const uint16* t = src_ptr + src_stride; |
| int x; |
| assert((dst_width % 3 == 0) && (dst_width > 0)); |
| for (x = 0; x < dst_width; x += 3) { |
| uint16 a0 = (s[0] * 3 + s[1] * 1 + 2) >> 2; |
| uint16 a1 = (s[1] * 1 + s[2] * 1 + 1) >> 1; |
| uint16 a2 = (s[2] * 1 + s[3] * 3 + 2) >> 2; |
| uint16 b0 = (t[0] * 3 + t[1] * 1 + 2) >> 2; |
| uint16 b1 = (t[1] * 1 + t[2] * 1 + 1) >> 1; |
| uint16 b2 = (t[2] * 1 + t[3] * 3 + 2) >> 2; |
| d[0] = (a0 + b0 + 1) >> 1; |
| d[1] = (a1 + b1 + 1) >> 1; |
| d[2] = (a2 + b2 + 1) >> 1; |
| d += 3; |
| s += 4; |
| t += 4; |
| } |
| } |
| |
| // Scales a single row of pixels using point sampling. |
| void ScaleCols_C(uint8* dst_ptr, const uint8* src_ptr, |
| int dst_width, int x, int dx) { |
| int j; |
| for (j = 0; j < dst_width - 1; j += 2) { |
| dst_ptr[0] = src_ptr[x >> 16]; |
| x += dx; |
| dst_ptr[1] = src_ptr[x >> 16]; |
| x += dx; |
| dst_ptr += 2; |
| } |
| if (dst_width & 1) { |
| dst_ptr[0] = src_ptr[x >> 16]; |
| } |
| } |
| |
| void ScaleCols_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) { |
| dst_ptr[0] = src_ptr[x >> 16]; |
| x += dx; |
| dst_ptr[1] = src_ptr[x >> 16]; |
| x += dx; |
| dst_ptr += 2; |
| } |
| if (dst_width & 1) { |
| dst_ptr[0] = src_ptr[x >> 16]; |
| } |
| } |
| |
| // Scales a single row of pixels up by 2x using point sampling. |
| void ScaleColsUp2_C(uint8* dst_ptr, const uint8* src_ptr, |
| int dst_width, int x, int dx) { |
| int j; |
| for (j = 0; j < dst_width - 1; j += 2) { |
| dst_ptr[1] = dst_ptr[0] = src_ptr[0]; |
| src_ptr += 1; |
| dst_ptr += 2; |
| } |
| if (dst_width & 1) { |
| dst_ptr[0] = src_ptr[0]; |
| } |
| } |
| |
| void ScaleColsUp2_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) { |
| dst_ptr[1] = dst_ptr[0] = src_ptr[0]; |
| src_ptr += 1; |
| dst_ptr += 2; |
| } |
| if (dst_width & 1) { |
| dst_ptr[0] = src_ptr[0]; |
| } |
| } |
| |
| // (1-f)a + fb can be replaced with a + f(b-a) |
| #define BLENDER(a, b, f) (uint8)((int)(a) + \ |
| ((int)(f) * ((int)(b) - (int)(a)) >> 16)) |
| |
| void ScaleFilterCols_C(uint8* dst_ptr, const uint8* 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_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 |
