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+/*
+ * Copyright (c) 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/scale.h"
+
+#include <assert.h>
+#include <string.h>
+
+#include "libyuv/cpu_id.h"
+
+#if defined(_MSC_VER)
+#define ALIGN16(var) __declspec(align(16)) var
+#else
+#define ALIGN16(var) var __attribute__((aligned(16)))
+#endif
+
+// Note: A Neon reference manual
+// http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0204j/CJAJIIGG.html
+// Note: Some SSE2 reference manuals
+// cpuvol1.pdf agner_instruction_tables.pdf 253666.pdf 253667.pdf
+
+namespace libyuv {
+
+// Set the following flag to true to revert to only
+// using the reference implementation ScalePlaneBox(), and
+// NOT the optimized versions. Useful for debugging and
+// when comparing the quality of the resulting YUV planes
+// as produced by the optimized and non-optimized versions.
+
+static bool use_reference_impl_ = false;
+
+void SetUseReferenceImpl(bool use) {
+ use_reference_impl_ = use;
+}
+
+/**
+ * NEON downscalers with interpolation.
+ *
+ * Provided by Fritz Koenig
+ *
+ */
+
+#if defined(__ARM_NEON__) && !defined(COVERAGE_ENABLED)
+#define HAS_SCALEROWDOWN2_NEON
+void ScaleRowDown2_NEON(const uint8* src_ptr, int /* src_stride */,
+ uint8* dst, int dst_width) {
+ __asm__ volatile
+ (
+ "1:\n"
+ "vld2.u8 {q0,q1}, [%0]! \n" // load even pixels into q0, odd into q1
+ "vst1.u8 {q0}, [%1]! \n" // store even pixels
+ "subs %2, %2, #16 \n" // 16 processed per loop
+ "bhi 1b \n"
+ : "+r"(src_ptr), // %0
+ "+r"(dst), // %1
+ "+r"(dst_width) // %2
+ :
+ : "q0", "q1" // Clobber List
+ );
+}
+
+void ScaleRowDown2Int_NEON(const uint8* src_ptr, int src_stride,
+ uint8* dst, int dst_width) {
+ __asm__ volatile
+ (
+ "mov r4, #2 \n" // rounding constant
+ "add %1, %0 \n" // change the stride to row 2 pointer
+ "vdup.16 q4, r4 \n"
+ "1:\n"
+ "vld1.u8 {q0,q1}, [%0]! \n" // load row 1 and post increment
+ "vld1.u8 {q2,q3}, [%1]! \n" // load row 2 and post increment
+ "vpaddl.u8 q0, q0 \n" // row 1 add adjacent
+ "vpaddl.u8 q1, q1 \n"
+ "vpadal.u8 q0, q2 \n" // row 2 add adjacent, add row 1 to row 2
+ "vpadal.u8 q1, q3 \n"
+ "vadd.u16 q0, q4 \n" // rounding
+ "vadd.u16 q1, q4 \n"
+ "vshrn.u16 d0, q0, #2 \n" // downshift and pack
+ "vshrn.u16 d1, q1, #2 \n"
+ "vst1.u8 {q0}, [%2]! \n"
+ "subs %3, %3, #16 \n" // 16 processed per loop
+ "bhi 1b \n"
+ : "+r"(src_ptr), // %0
+ "+r"(src_stride), // %1
+ "+r"(dst), // %2
+ "+r"(dst_width) // %3
+ :
+ : "r4", "q0", "q1", "q2", "q3", "q4" // Clobber List
+ );
+}
+
+#define HAS_SCALEROWDOWN4_NEON
+// Expecting widths on arm devices to be smaller. Went with 8x4 blocks
+// to get most coverage. Look to back and evaluate 16x4 blocks with
+// handling of leftovers.
+static void ScaleRowDown4_NEON(const uint8* src_ptr, int /* src_stride */,
+ uint8* dst_ptr, int dst_width) {
+ __asm__ volatile
+ (
+ "mov r4, #4 \n"
+ "1: \n"
+ "vld1.u8 {d0[0]}, [%0],r4 \n" // load up only 2 pixels of data to
+ "vld1.u8 {d0[1]}, [%0],r4 \n" // represent the entire 8x4 block
+
+ "vst1.u16 {d0[0]}, [%1]! \n"
+
+ "subs %2, #2 \n" // dst_width -= 2
+ "bhi 1b \n"
+ : "+r"(src_ptr), // %0
+ "+r"(dst_ptr), // %1
+ "+r"(dst_width) // %2
+ :
+ : "r4", "q0", "q1", "memory", "cc"
+ );
+}
+
+static void ScaleRowDown4Int_NEON(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ __asm__ volatile
+ (
+ "1: \n"
+ "mov r4, %0 \n"
+ "vld1.u8 {d0}, [r4],%3 \n" // load up 8x4 block of input data
+ "vld1.u8 {d1}, [r4],%3 \n"
+ "vld1.u8 {d2}, [r4],%3 \n"
+ "vld1.u8 {d3}, [r4] \n"
+
+ // data is loaded up int q0 and q1
+ // q0 = a00 a01 a02 a03 b00 b01 b02 b03 a10 a11 a12 a13 b10 b11 b12 b13
+ // q1 = a20 a21 a22 a23 b20 b21 b22 b23 a20 a21 a22 a23 b20 b21 b22 b23
+ // q0 = a00+a01 a02+a03 b00+b01 b02+b03 a10+a11 a12+a13 b10+b11 b12+b13
+ "vpaddl.u8 q0, q0 \n"
+
+ // d0 = a00+a01+a20+a21 a02+a03+a22+a23 b00+b01+b20+b21 b02+b03+b22+b23
+ // d1 = a10+a11+a20+a21 a12+a13+a22+a23 b10+b11+b20+b21 b12+b13+b22+b23
+ "vpadal.u8 q0, q1 \n"
+
+ // d0 = a00+a01+a20+a21+a02+a03+a22+a23 b00+b01+b20+b21+b02+b03+b22+b23
+ // d1 = a10+a11+a20+a21+a12+a13+a22+a23 b10+b11+b20+b21+b12+b13+b22+b23
+ "vpaddl.u16 q0, q0 \n"
+
+
+ // d0 = a00+a01+a20+a21+a02+a03+a22+a23+a10+a11+a20+a21+a12+a13+a22+a23
+ // b00+b01+b20+b21+b02+b03+b22+b23+b10+b11+b20+b21+b12+b13+b22+b23
+ "vadd.u32 d0, d1 \n"
+
+ "vrshr.u32 d0, d0, #4 \n" // divide by 16 w/rounding
+
+ "vst1.u8 {d0[0]}, [%1]! \n"
+ "vst1.u8 {d0[4]}, [%1]! \n"
+
+ "add %0, #8 \n" // move src pointer to next 8 pixels
+ "subs %2, #2 \n" // dst_width -= 2
+ "bhi 1b \n"
+
+ : "+r"(src_ptr), // %0
+ "+r"(dst_ptr), // %1
+ "+r"(dst_width) // %2
+ : "r"(src_stride) // %3
+ : "r4", "q0", "q1", "memory", "cc"
+ );
+}
+
+/**
+ * SSE2 downscalers with interpolation.
+ *
+ * Provided by Frank Barchard (fbarchard@google.com)
+ *
+ */
+
+// Constants for SSE2 code
+#elif (defined(WIN32) || defined(__i386__) || defined(__x86_64__)) && \
+ !defined(COVERAGE_ENABLED) && !TARGET_IPHONE_SIMULATOR
+#if defined(_MSC_VER)
+#define TALIGN16(t, var) __declspec(align(16)) t _ ## var
+#elif defined(OSX)
+#define TALIGN16(t, var) t var __attribute__((aligned(16)))
+#else
+#define TALIGN16(t, var) t _ ## var __attribute__((aligned(16)))
+#endif
+
+// Offsets for source bytes 0 to 9
+extern "C" TALIGN16(const uint8, shuf0[16]) =
+ { 0, 1, 3, 4, 5, 7, 8, 9, 128, 128, 128, 128, 128, 128, 128, 128 };
+
+// Offsets for source bytes 11 to 20 with 8 subtracted = 3 to 12.
+extern "C" TALIGN16(const uint8, shuf1[16]) =
+ { 3, 4, 5, 7, 8, 9, 11, 12, 128, 128, 128, 128, 128, 128, 128, 128 };
+
+// Offsets for source bytes 21 to 31 with 16 subtracted = 5 to 31.
+extern "C" TALIGN16(const uint8, shuf2[16]) =
+ { 5, 7, 8, 9, 11, 12, 13, 15, 128, 128, 128, 128, 128, 128, 128, 128 };
+
+// Offsets for source bytes 0 to 10
+extern "C" TALIGN16(const uint8, shuf01[16]) =
+ { 0, 1, 1, 2, 2, 3, 4, 5, 5, 6, 6, 7, 8, 9, 9, 10 };
+
+// Offsets for source bytes 10 to 21 with 8 subtracted = 3 to 13.
+extern "C" TALIGN16(const uint8, shuf11[16]) =
+ { 2, 3, 4, 5, 5, 6, 6, 7, 8, 9, 9, 10, 10, 11, 12, 13 };
+
+// Offsets for source bytes 21 to 31 with 16 subtracted = 5 to 31.
+extern "C" TALIGN16(const uint8, shuf21[16]) =
+ { 5, 6, 6, 7, 8, 9, 9, 10, 10, 11, 12, 13, 13, 14, 14, 15 };
+
+// Coefficients for source bytes 0 to 10
+extern "C" TALIGN16(const uint8, madd01[16]) =
+ { 3, 1, 2, 2, 1, 3, 3, 1, 2, 2, 1, 3, 3, 1, 2, 2 };
+
+// Coefficients for source bytes 10 to 21
+extern "C" TALIGN16(const uint8, madd11[16]) =
+ { 1, 3, 3, 1, 2, 2, 1, 3, 3, 1, 2, 2, 1, 3, 3, 1 };
+
+// Coefficients for source bytes 21 to 31
+extern "C" TALIGN16(const uint8, madd21[16]) =
+ { 2, 2, 1, 3, 3, 1, 2, 2, 1, 3, 3, 1, 2, 2, 1, 3 };
+
+// Coefficients for source bytes 21 to 31
+extern "C" TALIGN16(const int16, round34[8]) =
+ { 2, 2, 2, 2, 2, 2, 2, 2 };
+
+extern "C" TALIGN16(const uint8, shuf38a[16]) =
+ { 0, 3, 6, 8, 11, 14, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 };
+
+extern "C" TALIGN16(const uint8, shuf38b[16]) =
+ { 128, 128, 128, 128, 128, 128, 0, 3, 6, 8, 11, 14, 128, 128, 128, 128 };
+
+// Arrange words 0,3,6 into 0,1,2
+extern "C" TALIGN16(const uint8, shufac0[16]) =
+ { 0, 1, 6, 7, 12, 13, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 };
+
+// Arrange words 0,3,6 into 3,4,5
+extern "C" TALIGN16(const uint8, shufac3[16]) =
+ { 128, 128, 128, 128, 128, 128, 0, 1, 6, 7, 12, 13, 128, 128, 128, 128 };
+
+// Scaling values for boxes of 3x3 and 2x3
+extern "C" TALIGN16(const uint16, scaleac3[8]) =
+ { 65536 / 9, 65536 / 9, 65536 / 6, 65536 / 9, 65536 / 9, 65536 / 6, 0, 0 };
+
+// Arrange first value for pixels 0,1,2,3,4,5
+extern "C" TALIGN16(const uint8, shufab0[16]) =
+ { 0, 128, 3, 128, 6, 128, 8, 128, 11, 128, 14, 128, 128, 128, 128, 128 };
+
+// Arrange second value for pixels 0,1,2,3,4,5
+extern "C" TALIGN16(const uint8, shufab1[16]) =
+ { 1, 128, 4, 128, 7, 128, 9, 128, 12, 128, 15, 128, 128, 128, 128, 128 };
+
+// Arrange third value for pixels 0,1,2,3,4,5
+extern "C" TALIGN16(const uint8, shufab2[16]) =
+ { 2, 128, 5, 128, 128, 128, 10, 128, 13, 128, 128, 128, 128, 128, 128, 128 };
+
+// Scaling values for boxes of 3x2 and 2x2
+extern "C" TALIGN16(const uint16, scaleab2[8]) =
+ { 65536 / 3, 65536 / 3, 65536 / 2, 65536 / 3, 65536 / 3, 65536 / 2, 0, 0 };
+#endif
+
+#if defined(WIN32) && !defined(COVERAGE_ENABLED)
+
+#define HAS_SCALEROWDOWN2_SSE2
+// Reads 32 pixels, throws half away and writes 16 pixels.
+// Alignment requirement: src_ptr 16 byte aligned, dst_ptr 16 byte aligned.
+__declspec(naked)
+static void ScaleRowDown2_SSE2(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ __asm {
+ mov eax, [esp + 4] // src_ptr
+ // src_stride ignored
+ mov edx, [esp + 12] // dst_ptr
+ mov ecx, [esp + 16] // dst_width
+ pcmpeqb xmm7, xmm7 // generate mask 0x00ff00ff
+ psrlw xmm7, 8
+
+ wloop:
+ movdqa xmm0, [eax]
+ movdqa xmm1, [eax + 16]
+ lea eax, [eax + 32]
+ pand xmm0, xmm7
+ pand xmm1, xmm7
+ packuswb xmm0, xmm1
+ movdqa [edx], xmm0
+ lea edx, [edx + 16]
+ sub ecx, 16
+ ja wloop
+
+ ret
+ }
+}
+// Blends 32x2 rectangle to 16x1.
+// Alignment requirement: src_ptr 16 byte aligned, dst_ptr 16 byte aligned.
+__declspec(naked)
+static void ScaleRowDown2Int_SSE2(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ __asm {
+ push esi
+ mov eax, [esp + 4 + 4] // src_ptr
+ mov esi, [esp + 4 + 8] // src_stride
+ mov edx, [esp + 4 + 12] // dst_ptr
+ mov ecx, [esp + 4 + 16] // dst_width
+ pcmpeqb xmm7, xmm7 // generate mask 0x00ff00ff
+ psrlw xmm7, 8
+
+ wloop:
+ movdqa xmm0, [eax]
+ movdqa xmm1, [eax + 16]
+ movdqa xmm2, [eax + esi]
+ movdqa xmm3, [eax + esi + 16]
+ lea eax, [eax + 32]
+ pavgb xmm0, xmm2 // average rows
+ pavgb xmm1, xmm3
+
+ movdqa xmm2, xmm0 // average columns (32 to 16 pixels)
+ psrlw xmm0, 8
+ movdqa xmm3, xmm1
+ psrlw xmm1, 8
+ pand xmm2, xmm7
+ pand xmm3, xmm7
+ pavgw xmm0, xmm2
+ pavgw xmm1, xmm3
+ packuswb xmm0, xmm1
+
+ movdqa [edx], xmm0
+ lea edx, [edx + 16]
+ sub ecx, 16
+ ja wloop
+
+ pop esi
+ ret
+ }
+}
+
+#define HAS_SCALEROWDOWN4_SSE2
+// Point samples 32 pixels to 8 pixels.
+// Alignment requirement: src_ptr 16 byte aligned, dst_ptr 8 byte aligned.
+__declspec(naked)
+static void ScaleRowDown4_SSE2(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ __asm {
+ pushad
+ mov esi, [esp + 32 + 4] // src_ptr
+ // src_stride ignored
+ mov edi, [esp + 32 + 12] // dst_ptr
+ mov ecx, [esp + 32 + 16] // dst_width
+ pcmpeqb xmm7, xmm7 // generate mask 0x000000ff
+ psrld xmm7, 24
+
+ wloop:
+ movdqa xmm0, [esi]
+ movdqa xmm1, [esi + 16]
+ lea esi, [esi + 32]
+ pand xmm0, xmm7
+ pand xmm1, xmm7
+ packuswb xmm0, xmm1
+ packuswb xmm0, xmm0
+ movq qword ptr [edi], xmm0
+ lea edi, [edi + 8]
+ sub ecx, 8
+ ja wloop
+
+ popad
+ ret
+ }
+}
+
+// Blends 32x4 rectangle to 8x1.
+// Alignment requirement: src_ptr 16 byte aligned, dst_ptr 8 byte aligned.
+__declspec(naked)
+static void ScaleRowDown4Int_SSE2(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ __asm {
+ pushad
+ mov esi, [esp + 32 + 4] // src_ptr
+ mov ebx, [esp + 32 + 8] // src_stride
+ mov edi, [esp + 32 + 12] // dst_ptr
+ mov ecx, [esp + 32 + 16] // dst_width
+ pcmpeqb xmm7, xmm7 // generate mask 0x00ff00ff
+ psrlw xmm7, 8
+ lea edx, [ebx + ebx * 2] // src_stride * 3
+
+ wloop:
+ movdqa xmm0, [esi]
+ movdqa xmm1, [esi + 16]
+ movdqa xmm2, [esi + ebx]
+ movdqa xmm3, [esi + ebx + 16]
+ pavgb xmm0, xmm2 // average rows
+ pavgb xmm1, xmm3
+ movdqa xmm2, [esi + ebx * 2]
+ movdqa xmm3, [esi + ebx * 2 + 16]
+ movdqa xmm4, [esi + edx]
+ movdqa xmm5, [esi + edx + 16]
+ lea esi, [esi + 32]
+ pavgb xmm2, xmm4
+ pavgb xmm3, xmm5
+ pavgb xmm0, xmm2
+ pavgb xmm1, xmm3
+
+ movdqa xmm2, xmm0 // average columns (32 to 16 pixels)
+ psrlw xmm0, 8
+ movdqa xmm3, xmm1
+ psrlw xmm1, 8
+ pand xmm2, xmm7
+ pand xmm3, xmm7
+ pavgw xmm0, xmm2
+ pavgw xmm1, xmm3
+ packuswb xmm0, xmm1
+
+ movdqa xmm2, xmm0 // average columns (16 to 8 pixels)
+ psrlw xmm0, 8
+ pand xmm2, xmm7
+ pavgw xmm0, xmm2
+ packuswb xmm0, xmm0
+
+ movq qword ptr [edi], xmm0
+ lea edi, [edi + 8]
+ sub ecx, 8
+ ja wloop
+
+ popad
+ ret
+ }
+}
+
+#define HAS_SCALEROWDOWN8_SSE2
+// Point samples 32 pixels to 4 pixels.
+// Alignment requirement: src_ptr 16 byte aligned, dst_ptr 4 byte aligned.
+__declspec(naked)
+static void ScaleRowDown8_SSE2(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ __asm {
+ pushad
+ mov esi, [esp + 32 + 4] // src_ptr
+ // src_stride ignored
+ mov edi, [esp + 32 + 12] // dst_ptr
+ mov ecx, [esp + 32 + 16] // dst_width
+ pcmpeqb xmm7, xmm7 // generate mask isolating 1 src 8 bytes
+ psrlq xmm7, 56
+
+ wloop:
+ movdqa xmm0, [esi]
+ movdqa xmm1, [esi + 16]
+ lea esi, [esi + 32]
+ pand xmm0, xmm7
+ pand xmm1, xmm7
+ packuswb xmm0, xmm1 // 32->16
+ packuswb xmm0, xmm0 // 16->8
+ packuswb xmm0, xmm0 // 8->4
+ movd dword ptr [edi], xmm0
+ lea edi, [edi + 4]
+ sub ecx, 4
+ ja wloop
+
+ popad
+ ret
+ }
+}
+
+// Blends 32x8 rectangle to 4x1.
+// Alignment requirement: src_ptr 16 byte aligned, dst_ptr 4 byte aligned.
+__declspec(naked)
+static void ScaleRowDown8Int_SSE2(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ __asm {
+ pushad
+ mov esi, [esp + 32 + 4] // src_ptr
+ mov ebx, [esp + 32 + 8] // src_stride
+ mov edi, [esp + 32 + 12] // dst_ptr
+ mov ecx, [esp + 32 + 16] // dst_width
+ lea edx, [ebx + ebx * 2] // src_stride * 3
+ pxor xmm7, xmm7
+
+ wloop:
+ movdqa xmm0, [esi] // average 8 rows to 1
+ movdqa xmm1, [esi + 16]
+ movdqa xmm2, [esi + ebx]
+ movdqa xmm3, [esi + ebx + 16]
+ pavgb xmm0, xmm2
+ pavgb xmm1, xmm3
+ movdqa xmm2, [esi + ebx * 2]
+ movdqa xmm3, [esi + ebx * 2 + 16]
+ movdqa xmm4, [esi + edx]
+ movdqa xmm5, [esi + edx + 16]
+ lea ebp, [esi + ebx * 4]
+ lea esi, [esi + 32]
+ pavgb xmm2, xmm4
+ pavgb xmm3, xmm5
+ pavgb xmm0, xmm2
+ pavgb xmm1, xmm3
+
+ movdqa xmm2, [ebp]
+ movdqa xmm3, [ebp + 16]
+ movdqa xmm4, [ebp + ebx]
+ movdqa xmm5, [ebp + ebx + 16]
+ pavgb xmm2, xmm4
+ pavgb xmm3, xmm5
+ movdqa xmm4, [ebp + ebx * 2]
+ movdqa xmm5, [ebp + ebx * 2 + 16]
+ movdqa xmm6, [ebp + edx]
+ pavgb xmm4, xmm6
+ movdqa xmm6, [ebp + edx + 16]
+ pavgb xmm5, xmm6
+ pavgb xmm2, xmm4
+ pavgb xmm3, xmm5
+ pavgb xmm0, xmm2
+ pavgb xmm1, xmm3
+
+ psadbw xmm0, xmm7 // average 32 pixels to 4
+ psadbw xmm1, xmm7
+ pshufd xmm0, xmm0, 0xd8 // x1x0 -> xx01
+ pshufd xmm1, xmm1, 0x8d // x3x2 -> 32xx
+ por xmm0, xmm1 // -> 3201
+ psrlw xmm0, 3
+ packuswb xmm0, xmm0
+ packuswb xmm0, xmm0
+ movd dword ptr [edi], xmm0
+
+ lea edi, [edi + 4]
+ sub ecx, 4
+ ja wloop
+
+ popad
+ ret
+ }
+}
+
+#define HAS_SCALEROWDOWN34_SSSE3
+// Point samples 32 pixels to 24 pixels.
+// Produces three 8 byte values. For each 8 bytes, 16 bytes are read.
+// Then shuffled to do the scaling.
+
+// Note that movdqa+palign may be better than movdqu.
+// Alignment requirement: src_ptr 16 byte aligned, dst_ptr 8 byte aligned.
+__declspec(naked)
+static void ScaleRowDown34_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ __asm {
+ pushad
+ mov esi, [esp + 32 + 4] // src_ptr
+ // src_stride ignored
+ mov edi, [esp + 32 + 12] // dst_ptr
+ mov ecx, [esp + 32 + 16] // dst_width
+ movdqa xmm3, _shuf0
+ movdqa xmm4, _shuf1
+ movdqa xmm5, _shuf2
+
+ wloop:
+ movdqa xmm0, [esi]
+ movdqa xmm2, [esi + 16]
+ lea esi, [esi + 32]
+ movdqa xmm1, xmm2
+ palignr xmm1, xmm0, 8
+ pshufb xmm0, xmm3
+ pshufb xmm1, xmm4
+ pshufb xmm2, xmm5
+ movq qword ptr [edi], xmm0
+ movq qword ptr [edi + 8], xmm1
+ movq qword ptr [edi + 16], xmm2
+ lea edi, [edi + 24]
+ sub ecx, 24
+ ja wloop
+
+ popad
+ ret
+ }
+}
+
+// Blends 32x2 rectangle to 24x1
+// Produces three 8 byte values. For each 8 bytes, 16 bytes are read.
+// Then shuffled to do the scaling.
+
+// Register usage:
+// xmm0 src_row 0
+// xmm1 src_row 1
+// xmm2 shuf 0
+// xmm3 shuf 1
+// xmm4 shuf 2
+// xmm5 madd 0
+// xmm6 madd 1
+// xmm7 round34
+
+// Note that movdqa+palign may be better than movdqu.
+// Alignment requirement: src_ptr 16 byte aligned, dst_ptr 8 byte aligned.
+__declspec(naked)
+static void ScaleRowDown34_1_Int_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ __asm {
+ pushad
+ mov esi, [esp + 32 + 4] // src_ptr
+ mov ebx, [esp + 32 + 8] // src_stride
+ mov edi, [esp + 32 + 12] // dst_ptr
+ mov ecx, [esp + 32 + 16] // dst_width
+ movdqa xmm2, _shuf01
+ movdqa xmm3, _shuf11
+ movdqa xmm4, _shuf21
+ movdqa xmm5, _madd01
+ movdqa xmm6, _madd11
+ movdqa xmm7, _round34
+
+ wloop:
+ movdqa xmm0, [esi] // pixels 0..7
+ movdqa xmm1, [esi+ebx]
+ pavgb xmm0, xmm1
+ pshufb xmm0, xmm2
+ pmaddubsw xmm0, xmm5
+ paddsw xmm0, xmm7
+ psrlw xmm0, 2
+ packuswb xmm0, xmm0
+ movq qword ptr [edi], xmm0
+ movdqu xmm0, [esi+8] // pixels 8..15
+ movdqu xmm1, [esi+ebx+8]
+ pavgb xmm0, xmm1
+ pshufb xmm0, xmm3
+ pmaddubsw xmm0, xmm6
+ paddsw xmm0, xmm7
+ psrlw xmm0, 2
+ packuswb xmm0, xmm0
+ movq qword ptr [edi+8], xmm0
+ movdqa xmm0, [esi+16] // pixels 16..23
+ movdqa xmm1, [esi+ebx+16]
+ lea esi, [esi+32]
+ pavgb xmm0, xmm1
+ pshufb xmm0, xmm4
+ movdqa xmm1, _madd21
+ pmaddubsw xmm0, xmm1
+ paddsw xmm0, xmm7
+ psrlw xmm0, 2
+ packuswb xmm0, xmm0
+ movq qword ptr [edi+16], xmm0
+ lea edi, [edi+24]
+ sub ecx, 24
+ ja wloop
+
+ popad
+ ret
+ }
+}
+
+// Note that movdqa+palign may be better than movdqu.
+// Alignment requirement: src_ptr 16 byte aligned, dst_ptr 8 byte aligned.
+__declspec(naked)
+static void ScaleRowDown34_0_Int_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ __asm {
+ pushad
+ mov esi, [esp + 32 + 4] // src_ptr
+ mov ebx, [esp + 32 + 8] // src_stride
+ mov edi, [esp + 32 + 12] // dst_ptr
+ mov ecx, [esp + 32 + 16] // dst_width
+ movdqa xmm2, _shuf01
+ movdqa xmm3, _shuf11
+ movdqa xmm4, _shuf21
+ movdqa xmm5, _madd01
+ movdqa xmm6, _madd11
+ movdqa xmm7, _round34
+
+ wloop:
+ movdqa xmm0, [esi] // pixels 0..7
+ movdqa xmm1, [esi+ebx]
+ pavgb xmm1, xmm0
+ pavgb xmm0, xmm1
+ pshufb xmm0, xmm2
+ pmaddubsw xmm0, xmm5
+ paddsw xmm0, xmm7
+ psrlw xmm0, 2
+ packuswb xmm0, xmm0
+ movq qword ptr [edi], xmm0
+ movdqu xmm0, [esi+8] // pixels 8..15
+ movdqu xmm1, [esi+ebx+8]
+ pavgb xmm1, xmm0
+ pavgb xmm0, xmm1
+ pshufb xmm0, xmm3
+ pmaddubsw xmm0, xmm6
+ paddsw xmm0, xmm7
+ psrlw xmm0, 2
+ packuswb xmm0, xmm0
+ movq qword ptr [edi+8], xmm0
+ movdqa xmm0, [esi+16] // pixels 16..23
+ movdqa xmm1, [esi+ebx+16]
+ lea esi, [esi+32]
+ pavgb xmm1, xmm0
+ pavgb xmm0, xmm1
+ pshufb xmm0, xmm4
+ movdqa xmm1, _madd21
+ pmaddubsw xmm0, xmm1
+ paddsw xmm0, xmm7
+ psrlw xmm0, 2
+ packuswb xmm0, xmm0
+ movq qword ptr [edi+16], xmm0
+ lea edi, [edi+24]
+ sub ecx, 24
+ ja wloop
+
+ popad
+ ret
+ }
+}
+
+#define HAS_SCALEROWDOWN38_SSSE3
+// 3/8 point sampler
+
+// Scale 32 pixels to 12
+__declspec(naked)
+static void ScaleRowDown38_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ __asm {
+ pushad
+ mov esi, [esp + 32 + 4] // src_ptr
+ mov edx, [esp + 32 + 8] // src_stride
+ mov edi, [esp + 32 + 12] // dst_ptr
+ mov ecx, [esp + 32 + 16] // dst_width
+ movdqa xmm5, _shuf38a
+ movdqa xmm6, _shuf38b
+ pxor xmm7, xmm7
+
+ xloop:
+ movdqa xmm0, [esi] // 16 pixels -> 0,1,2,3,4,5
+ movdqa xmm1, [esi + 16] // 16 pixels -> 6,7,8,9,10,11
+ lea esi, [esi + 32]
+ pshufb xmm0, xmm5
+ pshufb xmm1, xmm6
+ paddusb xmm0, xmm1
+
+ movq qword ptr [edi], xmm0 // write 12 pixels
+ movhlps xmm1, xmm0
+ movd [edi + 8], xmm1
+ lea edi, [edi + 12]
+ sub ecx, 12
+ ja xloop
+
+ popad
+ ret
+ }
+}
+
+// Scale 16x3 pixels to 6x1 with interpolation
+__declspec(naked)
+static void ScaleRowDown38_3_Int_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ __asm {
+ pushad
+ mov esi, [esp + 32 + 4] // src_ptr
+ mov edx, [esp + 32 + 8] // src_stride
+ mov edi, [esp + 32 + 12] // dst_ptr
+ mov ecx, [esp + 32 + 16] // dst_width
+ movdqa xmm4, _shufac0
+ movdqa xmm5, _shufac3
+ movdqa xmm6, _scaleac3
+ pxor xmm7, xmm7
+
+ xloop:
+ movdqa xmm0, [esi] // sum up 3 rows into xmm0/1
+ movdqa xmm2, [esi + edx]
+ movhlps xmm1, xmm0
+ movhlps xmm3, xmm2
+ punpcklbw xmm0, xmm7
+ punpcklbw xmm1, xmm7
+ punpcklbw xmm2, xmm7
+ punpcklbw xmm3, xmm7
+ paddusw xmm0, xmm2
+ paddusw xmm1, xmm3
+ movdqa xmm2, [esi + edx * 2]
+ lea esi, [esi + 16]
+ movhlps xmm3, xmm2
+ punpcklbw xmm2, xmm7
+ punpcklbw xmm3, xmm7
+ paddusw xmm0, xmm2
+ paddusw xmm1, xmm3
+
+ movdqa xmm2, xmm0 // 8 pixels -> 0,1,2 of xmm2
+ psrldq xmm0, 2
+ paddusw xmm2, xmm0
+ psrldq xmm0, 2
+ paddusw xmm2, xmm0
+ pshufb xmm2, xmm4
+
+ movdqa xmm3, xmm1 // 8 pixels -> 3,4,5 of xmm2
+ psrldq xmm1, 2
+ paddusw xmm3, xmm1
+ psrldq xmm1, 2
+ paddusw xmm3, xmm1
+ pshufb xmm3, xmm5
+ paddusw xmm2, xmm3
+
+ pmulhuw xmm2, xmm6 // divide by 9,9,6, 9,9,6
+ packuswb xmm2, xmm2
+
+ movd [edi], xmm2 // write 6 pixels
+ pextrw eax, xmm2, 2
+ mov [edi + 4], ax
+ lea edi, [edi + 6]
+ sub ecx, 6
+ ja xloop
+
+ popad
+ ret
+ }
+}
+
+// Scale 16x2 pixels to 6x1 with interpolation
+__declspec(naked)
+static void ScaleRowDown38_2_Int_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ __asm {
+ pushad
+ mov esi, [esp + 32 + 4] // src_ptr
+ mov edx, [esp + 32 + 8] // src_stride
+ mov edi, [esp + 32 + 12] // dst_ptr
+ mov ecx, [esp + 32 + 16] // dst_width
+ movdqa xmm4, _shufab0
+ movdqa xmm5, _shufab1
+ movdqa xmm6, _shufab2
+ movdqa xmm7, _scaleab2
+
+ xloop:
+ movdqa xmm2, [esi] // average 2 rows into xmm2
+ pavgb xmm2, [esi + edx]
+ lea esi, [esi + 16]
+
+ movdqa xmm0, xmm2 // 16 pixels -> 0,1,2,3,4,5 of xmm0
+ pshufb xmm0, xmm4
+ movdqa xmm1, xmm2
+ pshufb xmm1, xmm5
+ paddusw xmm0, xmm1
+ pshufb xmm2, xmm6
+ paddusw xmm0, xmm2
+
+ pmulhuw xmm0, xmm7 // divide by 3,3,2, 3,3,2
+ packuswb xmm0, xmm0
+
+ movd [edi], xmm0 // write 6 pixels
+ pextrw eax, xmm0, 2
+ mov [edi + 4], ax
+ lea edi, [edi + 6]
+ sub ecx, 6
+ ja xloop
+
+ popad
+ ret
+ }
+}
+
+#define HAS_SCALEADDROWS_SSE2
+
+// Reads 8xN bytes and produces 16 shorts at a time.
+__declspec(naked)
+static void ScaleAddRows_SSE2(const uint8* src_ptr, int src_stride,
+ uint16* dst_ptr, int src_width,
+ int src_height) {
+ __asm {
+ pushad
+ mov esi, [esp + 32 + 4] // src_ptr
+ mov edx, [esp + 32 + 8] // src_stride
+ mov edi, [esp + 32 + 12] // dst_ptr
+ mov ecx, [esp + 32 + 16] // dst_width
+ mov ebx, [esp + 32 + 20] // height
+ pxor xmm7, xmm7
+ dec ebx
+
+ xloop:
+ // first row
+ movdqa xmm2, [esi]
+ lea eax, [esi + edx]
+ movhlps xmm3, xmm2
+ mov ebp, ebx
+ punpcklbw xmm2, xmm7
+ punpcklbw xmm3, xmm7
+
+ // sum remaining rows
+ yloop:
+ movdqa xmm0, [eax] // read 16 pixels
+ lea eax, [eax + edx] // advance to next row
+ movhlps xmm1, xmm0
+ punpcklbw xmm0, xmm7
+ punpcklbw xmm1, xmm7
+ paddusw xmm2, xmm0 // sum 16 words
+ paddusw xmm3, xmm1
+ sub ebp, 1
+ ja yloop
+
+ movdqa [edi], xmm2
+ movdqa [edi + 16], xmm3
+ lea edi, [edi + 32]
+ lea esi, [esi + 16]
+
+ sub ecx, 16
+ ja xloop
+
+ popad
+ ret
+ }
+}
+
+// Bilinear row filtering combines 16x2 -> 16x1. SSE2 version.
+#define HAS_SCALEFILTERROWS_SSE2
+__declspec(naked)
+static void ScaleFilterRows_SSE2(uint8* dst_ptr, const uint8* src_ptr,
+ int src_stride, int dst_width,
+ int source_y_fraction) {
+ __asm {
+ push esi
+ push edi
+ mov edi, [esp + 8 + 4] // dst_ptr
+ mov esi, [esp + 8 + 8] // src_ptr
+ mov edx, [esp + 8 + 12] // src_stride
+ mov ecx, [esp + 8 + 16] // dst_width
+ mov eax, [esp + 8 + 20] // source_y_fraction (0..255)
+ cmp eax, 0
+ je xloop1
+ cmp eax, 128
+ je xloop2
+
+ movd xmm6, eax // xmm6 = y fraction
+ punpcklwd xmm6, xmm6
+ pshufd xmm6, xmm6, 0
+ neg eax // xmm5 = 256 - y fraction
+ add eax, 256
+ movd xmm5, eax
+ punpcklwd xmm5, xmm5
+ pshufd xmm5, xmm5, 0
+ pxor xmm7, xmm7
+
+ xloop:
+ movdqa xmm0, [esi]
+ movdqa xmm2, [esi + edx]
+ lea esi, [esi + 16]
+ movdqa xmm1, xmm0
+ movdqa xmm3, xmm2
+ punpcklbw xmm0, xmm7
+ punpcklbw xmm2, xmm7
+ punpckhbw xmm1, xmm7
+ punpckhbw xmm3, xmm7
+ pmullw xmm0, xmm5 // scale row 0
+ pmullw xmm1, xmm5
+ pmullw xmm2, xmm6 // scale row 1
+ pmullw xmm3, xmm6
+ paddusw xmm0, xmm2 // sum rows
+ paddusw xmm1, xmm3
+ psrlw xmm0, 8
+ psrlw xmm1, 8
+ packuswb xmm0, xmm1
+ movdqa [edi], xmm0
+ lea edi, [edi + 16]
+ sub ecx, 16
+ ja xloop
+
+ mov al, [edi - 1]
+ mov [edi], al
+ pop edi
+ pop esi
+ ret
+
+ xloop1:
+ movdqa xmm0, [esi]
+ lea esi, [esi + 16]
+ movdqa [edi], xmm0
+ lea edi, [edi + 16]
+ sub ecx, 16
+ ja xloop1
+
+ mov al, [edi - 1]
+ mov [edi], al
+ pop edi
+ pop esi
+ ret
+
+ xloop2:
+ movdqa xmm0, [esi]
+ movdqa xmm2, [esi + edx]
+ lea esi, [esi + 16]
+ pavgb xmm0, xmm2
+ movdqa [edi], xmm0
+ lea edi, [edi + 16]
+ sub ecx, 16
+ ja xloop2
+
+ mov al, [edi - 1]
+ mov [edi], al
+ pop edi
+ pop esi
+ ret
+ }
+}
+
+// Bilinear row filtering combines 16x2 -> 16x1. SSSE3 version.
+#define HAS_SCALEFILTERROWS_SSSE3
+__declspec(naked)
+static void ScaleFilterRows_SSSE3(uint8* dst_ptr, const uint8* src_ptr,
+ int src_stride, int dst_width,
+ int source_y_fraction) {
+ __asm {
+ push esi
+ push edi
+ mov edi, [esp + 8 + 4] // dst_ptr
+ mov esi, [esp + 8 + 8] // src_ptr
+ mov edx, [esp + 8 + 12] // src_stride
+ mov ecx, [esp + 8 + 16] // dst_width
+ mov eax, [esp + 8 + 20] // source_y_fraction (0..255)
+ cmp eax, 0
+ je xloop1
+ cmp eax, 128
+ je xloop2
+
+ shr eax, 1
+ mov ah,al
+ neg al
+ add al, 128
+ movd xmm7, eax
+ punpcklwd xmm7, xmm7
+ pshufd xmm7, xmm7, 0
+
+ xloop:
+ movdqa xmm0, [esi]
+ movdqa xmm2, [esi + edx]
+ lea esi, [esi + 16]
+ movdqa xmm1, xmm0
+ punpcklbw xmm0, xmm2
+ punpckhbw xmm1, xmm2
+ pmaddubsw xmm0, xmm7
+ pmaddubsw xmm1, xmm7
+ psrlw xmm0, 7
+ psrlw xmm1, 7
+ packuswb xmm0, xmm1
+ movdqa [edi], xmm0
+ lea edi, [edi + 16]
+ sub ecx, 16
+ ja xloop
+
+ mov al, [edi - 1]
+ mov [edi], al
+ pop edi
+ pop esi
+ ret
+
+ xloop1:
+ movdqa xmm0, [esi]
+ lea esi, [esi + 16]
+ movdqa [edi], xmm0
+ lea edi, [edi + 16]
+ sub ecx, 16
+ ja xloop1
+
+ mov al, [edi - 1]
+ mov [edi], al
+ pop edi
+ pop esi
+ ret
+
+ xloop2:
+ movdqa xmm0, [esi]
+ movdqa xmm2, [esi + edx]
+ lea esi, [esi + 16]
+ pavgb xmm0, xmm2
+ movdqa [edi], xmm0
+ lea edi, [edi + 16]
+ sub ecx, 16
+ ja xloop2
+
+ mov al, [edi - 1]
+ mov [edi], al
+ pop edi
+ pop esi
+ ret
+
+ }
+}
+
+// Note that movdqa+palign may be better than movdqu.
+// Alignment requirement: src_ptr 16 byte aligned, dst_ptr 8 byte aligned.
+__declspec(naked)
+static void ScaleFilterCols34_SSSE3(uint8* dst_ptr, const uint8* src_ptr,
+ int dst_width) {
+ __asm {
+ mov edx, [esp + 4] // dst_ptr
+ mov eax, [esp + 8] // src_ptr
+ mov ecx, [esp + 12] // dst_width
+ movdqa xmm1, _round34
+ movdqa xmm2, _shuf01
+ movdqa xmm3, _shuf11
+ movdqa xmm4, _shuf21
+ movdqa xmm5, _madd01
+ movdqa xmm6, _madd11
+ movdqa xmm7, _madd21
+
+ wloop:
+ movdqa xmm0, [eax] // pixels 0..7
+ pshufb xmm0, xmm2
+ pmaddubsw xmm0, xmm5
+ paddsw xmm0, xmm1
+ psrlw xmm0, 2
+ packuswb xmm0, xmm0
+ movq qword ptr [edx], xmm0
+ movdqu xmm0, [eax+8] // pixels 8..15
+ pshufb xmm0, xmm3
+ pmaddubsw xmm0, xmm6
+ paddsw xmm0, xmm1
+ psrlw xmm0, 2
+ packuswb xmm0, xmm0
+ movq qword ptr [edx+8], xmm0
+ movdqa xmm0, [eax+16] // pixels 16..23
+ lea eax, [eax+32]
+ pshufb xmm0, xmm4
+ pmaddubsw xmm0, xmm7
+ paddsw xmm0, xmm1
+ psrlw xmm0, 2
+ packuswb xmm0, xmm0
+ movq qword ptr [edx+16], xmm0
+ lea edx, [edx+24]
+ sub ecx, 24
+ ja wloop
+ ret
+ }
+}
+
+#elif (defined(__x86_64__) || defined(__i386__)) && \
+ !defined(COVERAGE_ENABLED) && !defined(TARGET_IPHONE_SIMULATOR)
+
+// GCC versions of row functions are verbatim conversions from Visual C.
+// Generated using gcc disassembly on Visual C object file:
+// objdump -D yuvscaler.obj >yuvscaler.txt
+#define HAS_SCALEROWDOWN2_SSE2
+static void ScaleRowDown2_SSE2(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ asm volatile(
+ "pcmpeqb %%xmm7,%%xmm7\n"
+ "psrlw $0x8,%%xmm7\n"
+"1:"
+ "movdqa (%0),%%xmm0\n"
+ "movdqa 0x10(%0),%%xmm1\n"
+ "lea 0x20(%0),%0\n"
+ "pand %%xmm7,%%xmm0\n"
+ "pand %%xmm7,%%xmm1\n"
+ "packuswb %%xmm1,%%xmm0\n"
+ "movdqa %%xmm0,(%1)\n"
+ "lea 0x10(%1),%1\n"
+ "sub $0x10,%2\n"
+ "ja 1b\n"
+ : "+r"(src_ptr), // %0
+ "+r"(dst_ptr), // %1
+ "+r"(dst_width) // %2
+ :
+ : "memory"
+);
+}
+
+static void ScaleRowDown2Int_SSE2(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ asm volatile(
+ "pcmpeqb %%xmm7,%%xmm7\n"
+ "psrlw $0x8,%%xmm7\n"
+"1:"
+ "movdqa (%0),%%xmm0\n"
+ "movdqa 0x10(%0),%%xmm1\n"
+ "movdqa (%0,%3,1),%%xmm2\n"
+ "movdqa 0x10(%0,%3,1),%%xmm3\n"
+ "lea 0x20(%0),%0\n"
+ "pavgb %%xmm2,%%xmm0\n"
+ "pavgb %%xmm3,%%xmm1\n"
+ "movdqa %%xmm0,%%xmm2\n"
+ "psrlw $0x8,%%xmm0\n"
+ "movdqa %%xmm1,%%xmm3\n"
+ "psrlw $0x8,%%xmm1\n"
+ "pand %%xmm7,%%xmm2\n"
+ "pand %%xmm7,%%xmm3\n"
+ "pavgw %%xmm2,%%xmm0\n"
+ "pavgw %%xmm3,%%xmm1\n"
+ "packuswb %%xmm1,%%xmm0\n"
+ "movdqa %%xmm0,(%1)\n"
+ "lea 0x10(%1),%1\n"
+ "sub $0x10,%2\n"
+ "ja 1b\n"
+ : "+r"(src_ptr), // %0
+ "+r"(dst_ptr), // %1
+ "+r"(dst_width) // %2
+ : "r"(static_cast<intptr_t>(src_stride)) // %3
+ : "memory"
+);
+}
+
+#define HAS_SCALEROWDOWN4_SSE2
+static void ScaleRowDown4_SSE2(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ asm volatile(
+ "pcmpeqb %%xmm7,%%xmm7\n"
+ "psrld $0x18,%%xmm7\n"
+"1:"
+ "movdqa (%0),%%xmm0\n"
+ "movdqa 0x10(%0),%%xmm1\n"
+ "lea 0x20(%0),%0\n"
+ "pand %%xmm7,%%xmm0\n"
+ "pand %%xmm7,%%xmm1\n"
+ "packuswb %%xmm1,%%xmm0\n"
+ "packuswb %%xmm0,%%xmm0\n"
+ "movq %%xmm0,(%1)\n"
+ "lea 0x8(%1),%1\n"
+ "sub $0x8,%2\n"
+ "ja 1b\n"
+ : "+r"(src_ptr), // %0
+ "+r"(dst_ptr), // %1
+ "+r"(dst_width) // %2
+ :
+ : "memory"
+);
+}
+
+static void ScaleRowDown4Int_SSE2(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ intptr_t temp = 0;
+ asm volatile(
+ "pcmpeqb %%xmm7,%%xmm7\n"
+ "psrlw $0x8,%%xmm7\n"
+ "lea (%4,%4,2),%3\n"
+"1:"
+ "movdqa (%0),%%xmm0\n"
+ "movdqa 0x10(%0),%%xmm1\n"
+ "movdqa (%0,%4,1),%%xmm2\n"
+ "movdqa 0x10(%0,%4,1),%%xmm3\n"
+ "pavgb %%xmm2,%%xmm0\n"
+ "pavgb %%xmm3,%%xmm1\n"
+ "movdqa (%0,%4,2),%%xmm2\n"
+ "movdqa 0x10(%0,%4,2),%%xmm3\n"
+ "movdqa (%0,%3,1),%%xmm4\n"
+ "movdqa 0x10(%0,%3,1),%%xmm5\n"
+ "lea 0x20(%0),%0\n"
+ "pavgb %%xmm4,%%xmm2\n"
+ "pavgb %%xmm2,%%xmm0\n"
+ "pavgb %%xmm5,%%xmm3\n"
+ "pavgb %%xmm3,%%xmm1\n"
+ "movdqa %%xmm0,%%xmm2\n"
+ "psrlw $0x8,%%xmm0\n"
+ "movdqa %%xmm1,%%xmm3\n"
+ "psrlw $0x8,%%xmm1\n"
+ "pand %%xmm7,%%xmm2\n"
+ "pand %%xmm7,%%xmm3\n"
+ "pavgw %%xmm2,%%xmm0\n"
+ "pavgw %%xmm3,%%xmm1\n"
+ "packuswb %%xmm1,%%xmm0\n"
+ "movdqa %%xmm0,%%xmm2\n"
+ "psrlw $0x8,%%xmm0\n"
+ "pand %%xmm7,%%xmm2\n"
+ "pavgw %%xmm2,%%xmm0\n"
+ "packuswb %%xmm0,%%xmm0\n"
+ "movq %%xmm0,(%1)\n"
+ "lea 0x8(%1),%1\n"
+ "sub $0x8,%2\n"
+ "ja 1b\n"
+ : "+r"(src_ptr), // %0
+ "+r"(dst_ptr), // %1
+ "+r"(dst_width), // %2
+ "+r"(temp) // %3
+ : "r"(static_cast<intptr_t>(src_stride)) // %4
+ : "memory"
+);
+}
+
+#define HAS_SCALEROWDOWN8_SSE2
+static void ScaleRowDown8_SSE2(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ asm volatile(
+ "pcmpeqb %%xmm7,%%xmm7\n"
+ "psrlq $0x38,%%xmm7\n"
+"1:"
+ "movdqa (%0),%%xmm0\n"
+ "movdqa 0x10(%0),%%xmm1\n"
+ "lea 0x20(%0),%0\n"
+ "pand %%xmm7,%%xmm0\n"
+ "pand %%xmm7,%%xmm1\n"
+ "packuswb %%xmm1,%%xmm0\n"
+ "packuswb %%xmm0,%%xmm0\n"
+ "packuswb %%xmm0,%%xmm0\n"
+ "movd %%xmm0,(%1)\n"
+ "lea 0x4(%1),%1\n"
+ "sub $0x4,%2\n"
+ "ja 1b\n"
+ : "+r"(src_ptr), // %0
+ "+r"(dst_ptr), // %1
+ "+r"(dst_width) // %2
+ :
+ : "memory"
+);
+}
+
+#if defined(__i386__)
+extern "C" void ScaleRowDown8Int_SSE2(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width);
+ asm(
+ ".text\n"
+#if defined(OSX)
+ ".globl _ScaleRowDown8Int_SSE2\n"
+"_ScaleRowDown8Int_SSE2:\n"
+#else
+ ".global ScaleRowDown8Int_SSE2\n"
+"ScaleRowDown8Int_SSE2:\n"
+#endif
+ "pusha\n"
+ "mov 0x24(%esp),%esi\n"
+ "mov 0x28(%esp),%ebx\n"
+ "mov 0x2c(%esp),%edi\n"
+ "mov 0x30(%esp),%ecx\n"
+ "lea (%ebx,%ebx,2),%edx\n"
+ "pxor %xmm7,%xmm7\n"
+
+"1:"
+ "movdqa (%esi),%xmm0\n"
+ "movdqa 0x10(%esi),%xmm1\n"
+ "movdqa (%esi,%ebx,1),%xmm2\n"
+ "movdqa 0x10(%esi,%ebx,1),%xmm3\n"
+ "pavgb %xmm2,%xmm0\n"
+ "pavgb %xmm3,%xmm1\n"
+ "movdqa (%esi,%ebx,2),%xmm2\n"
+ "movdqa 0x10(%esi,%ebx,2),%xmm3\n"
+ "movdqa (%esi,%edx,1),%xmm4\n"
+ "movdqa 0x10(%esi,%edx,1),%xmm5\n"
+ "lea (%esi,%ebx,4),%ebp\n"
+ "lea 0x20(%esi),%esi\n"
+ "pavgb %xmm4,%xmm2\n"
+ "pavgb %xmm5,%xmm3\n"
+ "pavgb %xmm2,%xmm0\n"
+ "pavgb %xmm3,%xmm1\n"
+ "movdqa 0x0(%ebp),%xmm2\n"
+ "movdqa 0x10(%ebp),%xmm3\n"
+ "movdqa 0x0(%ebp,%ebx,1),%xmm4\n"
+ "movdqa 0x10(%ebp,%ebx,1),%xmm5\n"
+ "pavgb %xmm4,%xmm2\n"
+ "pavgb %xmm5,%xmm3\n"
+ "movdqa 0x0(%ebp,%ebx,2),%xmm4\n"
+ "movdqa 0x10(%ebp,%ebx,2),%xmm5\n"
+ "movdqa 0x0(%ebp,%edx,1),%xmm6\n"
+ "pavgb %xmm6,%xmm4\n"
+ "movdqa 0x10(%ebp,%edx,1),%xmm6\n"
+ "pavgb %xmm6,%xmm5\n"
+ "pavgb %xmm4,%xmm2\n"
+ "pavgb %xmm5,%xmm3\n"
+ "pavgb %xmm2,%xmm0\n"
+ "pavgb %xmm3,%xmm1\n"
+ "psadbw %xmm7,%xmm0\n"
+ "psadbw %xmm7,%xmm1\n"
+ "pshufd $0xd8,%xmm0,%xmm0\n"
+ "pshufd $0x8d,%xmm1,%xmm1\n"
+ "por %xmm1,%xmm0\n"
+ "psrlw $0x3,%xmm0\n"
+ "packuswb %xmm0,%xmm0\n"
+ "packuswb %xmm0,%xmm0\n"
+ "movd %xmm0,(%edi)\n"
+ "lea 0x4(%edi),%edi\n"
+ "sub $0x4,%ecx\n"
+ "ja 1b\n"
+ "popa\n"
+ "ret\n"
+);
+
+// fpic is used for magiccam plugin
+#if !defined(__PIC__)
+#define HAS_SCALEROWDOWN34_SSSE3
+extern "C" void ScaleRowDown34_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width);
+ asm(
+ ".text\n"
+#if defined(OSX)
+ ".globl _ScaleRowDown34_SSSE3\n"
+"_ScaleRowDown34_SSSE3:\n"
+#else
+ ".global ScaleRowDown34_SSSE3\n"
+"ScaleRowDown34_SSSE3:\n"
+#endif
+ "pusha\n"
+ "mov 0x24(%esp),%esi\n"
+ "mov 0x2c(%esp),%edi\n"
+ "mov 0x30(%esp),%ecx\n"
+ "movdqa _shuf0,%xmm3\n"
+ "movdqa _shuf1,%xmm4\n"
+ "movdqa _shuf2,%xmm5\n"
+
+"1:"
+ "movdqa (%esi),%xmm0\n"
+ "movdqa 0x10(%esi),%xmm2\n"
+ "lea 0x20(%esi),%esi\n"
+ "movdqa %xmm2,%xmm1\n"
+ "palignr $0x8,%xmm0,%xmm1\n"
+ "pshufb %xmm3,%xmm0\n"
+ "pshufb %xmm4,%xmm1\n"
+ "pshufb %xmm5,%xmm2\n"
+ "movq %xmm0,(%edi)\n"
+ "movq %xmm1,0x8(%edi)\n"
+ "movq %xmm2,0x10(%edi)\n"
+ "lea 0x18(%edi),%edi\n"
+ "sub $0x18,%ecx\n"
+ "ja 1b\n"
+ "popa\n"
+ "ret\n"
+);
+
+extern "C" void ScaleRowDown34_1_Int_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width);
+ asm(
+ ".text\n"
+#if defined(OSX)
+ ".globl _ScaleRowDown34_1_Int_SSSE3\n"
+"_ScaleRowDown34_1_Int_SSSE3:\n"
+#else
+ ".global ScaleRowDown34_1_Int_SSSE3\n"
+"ScaleRowDown34_1_Int_SSSE3:\n"
+#endif
+ "pusha\n"
+ "mov 0x24(%esp),%esi\n"
+ "mov 0x28(%esp),%ebp\n"
+ "mov 0x2c(%esp),%edi\n"
+ "mov 0x30(%esp),%ecx\n"
+ "movdqa _shuf01,%xmm2\n"
+ "movdqa _shuf11,%xmm3\n"
+ "movdqa _shuf21,%xmm4\n"
+ "movdqa _madd01,%xmm5\n"
+ "movdqa _madd11,%xmm6\n"
+ "movdqa _round34,%xmm7\n"
+
+"1:"
+ "movdqa (%esi),%xmm0\n"
+ "movdqa (%esi,%ebp),%xmm1\n"
+ "pavgb %xmm1,%xmm0\n"
+ "pshufb %xmm2,%xmm0\n"
+ "pmaddubsw %xmm5,%xmm0\n"
+ "paddsw %xmm7,%xmm0\n"
+ "psrlw $0x2,%xmm0\n"
+ "packuswb %xmm0,%xmm0\n"
+ "movq %xmm0,(%edi)\n"
+ "movdqu 0x8(%esi),%xmm0\n"
+ "movdqu 0x8(%esi,%ebp),%xmm1\n"
+ "pavgb %xmm1,%xmm0\n"
+ "pshufb %xmm3,%xmm0\n"
+ "pmaddubsw %xmm6,%xmm0\n"
+ "paddsw %xmm7,%xmm0\n"
+ "psrlw $0x2,%xmm0\n"
+ "packuswb %xmm0,%xmm0\n"
+ "movq %xmm0,0x8(%edi)\n"
+ "movdqa 0x10(%esi),%xmm0\n"
+ "movdqa 0x10(%esi,%ebp),%xmm1\n"
+ "lea 0x20(%esi),%esi\n"
+ "pavgb %xmm1,%xmm0\n"
+ "pshufb %xmm4,%xmm0\n"
+ "movdqa _madd21,%xmm1\n"
+ "pmaddubsw %xmm1,%xmm0\n"
+ "paddsw %xmm7,%xmm0\n"
+ "psrlw $0x2,%xmm0\n"
+ "packuswb %xmm0,%xmm0\n"
+ "movq %xmm0,0x10(%edi)\n"
+ "lea 0x18(%edi),%edi\n"
+ "sub $0x18,%ecx\n"
+ "ja 1b\n"
+
+ "popa\n"
+ "ret\n"
+);
+
+extern "C" void ScaleRowDown34_0_Int_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width);
+ asm(
+ ".text\n"
+#if defined(OSX)
+ ".globl _ScaleRowDown34_0_Int_SSSE3\n"
+"_ScaleRowDown34_0_Int_SSSE3:\n"
+#else
+ ".global ScaleRowDown34_0_Int_SSSE3\n"
+"ScaleRowDown34_0_Int_SSSE3:\n"
+#endif
+ "pusha\n"
+ "mov 0x24(%esp),%esi\n"
+ "mov 0x28(%esp),%ebp\n"
+ "mov 0x2c(%esp),%edi\n"
+ "mov 0x30(%esp),%ecx\n"
+ "movdqa _shuf01,%xmm2\n"
+ "movdqa _shuf11,%xmm3\n"
+ "movdqa _shuf21,%xmm4\n"
+ "movdqa _madd01,%xmm5\n"
+ "movdqa _madd11,%xmm6\n"
+ "movdqa _round34,%xmm7\n"
+
+"1:"
+ "movdqa (%esi),%xmm0\n"
+ "movdqa (%esi,%ebp,1),%xmm1\n"
+ "pavgb %xmm0,%xmm1\n"
+ "pavgb %xmm1,%xmm0\n"
+ "pshufb %xmm2,%xmm0\n"
+ "pmaddubsw %xmm5,%xmm0\n"
+ "paddsw %xmm7,%xmm0\n"
+ "psrlw $0x2,%xmm0\n"
+ "packuswb %xmm0,%xmm0\n"
+ "movq %xmm0,(%edi)\n"
+ "movdqu 0x8(%esi),%xmm0\n"
+ "movdqu 0x8(%esi,%ebp,1),%xmm1\n"
+ "pavgb %xmm0,%xmm1\n"
+ "pavgb %xmm1,%xmm0\n"
+ "pshufb %xmm3,%xmm0\n"
+ "pmaddubsw %xmm6,%xmm0\n"
+ "paddsw %xmm7,%xmm0\n"
+ "psrlw $0x2,%xmm0\n"
+ "packuswb %xmm0,%xmm0\n"
+ "movq %xmm0,0x8(%edi)\n"
+ "movdqa 0x10(%esi),%xmm0\n"
+ "movdqa 0x10(%esi,%ebp,1),%xmm1\n"
+ "lea 0x20(%esi),%esi\n"
+ "pavgb %xmm0,%xmm1\n"
+ "pavgb %xmm1,%xmm0\n"
+ "pshufb %xmm4,%xmm0\n"
+ "movdqa _madd21,%xmm1\n"
+ "pmaddubsw %xmm1,%xmm0\n"
+ "paddsw %xmm7,%xmm0\n"
+ "psrlw $0x2,%xmm0\n"
+ "packuswb %xmm0,%xmm0\n"
+ "movq %xmm0,0x10(%edi)\n"
+ "lea 0x18(%edi),%edi\n"
+ "sub $0x18,%ecx\n"
+ "ja 1b\n"
+ "popa\n"
+ "ret\n"
+);
+
+#define HAS_SCALEROWDOWN38_SSSE3
+extern "C" void ScaleRowDown38_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width);
+ asm(
+ ".text\n"
+#if defined(OSX)
+ ".globl _ScaleRowDown38_SSSE3\n"
+"_ScaleRowDown38_SSSE3:\n"
+#else
+ ".global ScaleRowDown38_SSSE3\n"
+"ScaleRowDown38_SSSE3:\n"
+#endif
+ "pusha\n"
+ "mov 0x24(%esp),%esi\n"
+ "mov 0x28(%esp),%edx\n"
+ "mov 0x2c(%esp),%edi\n"
+ "mov 0x30(%esp),%ecx\n"
+ "movdqa _shuf38a ,%xmm5\n"
+ "movdqa _shuf38b ,%xmm6\n"
+ "pxor %xmm7,%xmm7\n"
+
+"1:"
+ "movdqa (%esi),%xmm0\n"
+ "movdqa 0x10(%esi),%xmm1\n"
+ "lea 0x20(%esi),%esi\n"
+ "pshufb %xmm5,%xmm0\n"
+ "pshufb %xmm6,%xmm1\n"
+ "paddusb %xmm1,%xmm0\n"
+ "movq %xmm0,(%edi)\n"
+ "movhlps %xmm0,%xmm1\n"
+ "movd %xmm1,0x8(%edi)\n"
+ "lea 0xc(%edi),%edi\n"
+ "sub $0xc,%ecx\n"
+ "ja 1b\n"
+ "popa\n"
+ "ret\n"
+);
+
+extern "C" void ScaleRowDown38_3_Int_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width);
+ asm(
+ ".text\n"
+#if defined(OSX)
+ ".globl _ScaleRowDown38_3_Int_SSSE3\n"
+"_ScaleRowDown38_3_Int_SSSE3:\n"
+#else
+ ".global ScaleRowDown38_3_Int_SSSE3\n"
+"ScaleRowDown38_3_Int_SSSE3:\n"
+#endif
+ "pusha\n"
+ "mov 0x24(%esp),%esi\n"
+ "mov 0x28(%esp),%edx\n"
+ "mov 0x2c(%esp),%edi\n"
+ "mov 0x30(%esp),%ecx\n"
+ "movdqa _shufac0,%xmm4\n"
+ "movdqa _shufac3,%xmm5\n"
+ "movdqa _scaleac3,%xmm6\n"
+ "pxor %xmm7,%xmm7\n"
+
+"1:"
+ "movdqa (%esi),%xmm0\n"
+ "movdqa (%esi,%edx,1),%xmm2\n"
+ "movhlps %xmm0,%xmm1\n"
+ "movhlps %xmm2,%xmm3\n"
+ "punpcklbw %xmm7,%xmm0\n"
+ "punpcklbw %xmm7,%xmm1\n"
+ "punpcklbw %xmm7,%xmm2\n"
+ "punpcklbw %xmm7,%xmm3\n"
+ "paddusw %xmm2,%xmm0\n"
+ "paddusw %xmm3,%xmm1\n"
+ "movdqa (%esi,%edx,2),%xmm2\n"
+ "lea 0x10(%esi),%esi\n"
+ "movhlps %xmm2,%xmm3\n"
+ "punpcklbw %xmm7,%xmm2\n"
+ "punpcklbw %xmm7,%xmm3\n"
+ "paddusw %xmm2,%xmm0\n"
+ "paddusw %xmm3,%xmm1\n"
+ "movdqa %xmm0,%xmm2\n"
+ "psrldq $0x2,%xmm0\n"
+ "paddusw %xmm0,%xmm2\n"
+ "psrldq $0x2,%xmm0\n"
+ "paddusw %xmm0,%xmm2\n"
+ "pshufb %xmm4,%xmm2\n"
+ "movdqa %xmm1,%xmm3\n"
+ "psrldq $0x2,%xmm1\n"
+ "paddusw %xmm1,%xmm3\n"
+ "psrldq $0x2,%xmm1\n"
+ "paddusw %xmm1,%xmm3\n"
+ "pshufb %xmm5,%xmm3\n"
+ "paddusw %xmm3,%xmm2\n"
+ "pmulhuw %xmm6,%xmm2\n"
+ "packuswb %xmm2,%xmm2\n"
+ "movd %xmm2,(%edi)\n"
+ "pextrw $0x2,%xmm2,%eax\n"
+ "mov %ax,0x4(%edi)\n"
+ "lea 0x6(%edi),%edi\n"
+ "sub $0x6,%ecx\n"
+ "ja 1b\n"
+ "popa\n"
+ "ret\n"
+);
+
+extern "C" void ScaleRowDown38_2_Int_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width);
+ asm(
+ ".text\n"
+#if defined(OSX)
+ ".globl _ScaleRowDown38_2_Int_SSSE3\n"
+"_ScaleRowDown38_2_Int_SSSE3:\n"
+#else
+ ".global ScaleRowDown38_2_Int_SSSE3\n"
+"ScaleRowDown38_2_Int_SSSE3:\n"
+#endif
+ "pusha\n"
+ "mov 0x24(%esp),%esi\n"
+ "mov 0x28(%esp),%edx\n"
+ "mov 0x2c(%esp),%edi\n"
+ "mov 0x30(%esp),%ecx\n"
+ "movdqa _shufab0,%xmm4\n"
+ "movdqa _shufab1,%xmm5\n"
+ "movdqa _shufab2,%xmm6\n"
+ "movdqa _scaleab2,%xmm7\n"
+
+"1:"
+ "movdqa (%esi),%xmm2\n"
+ "pavgb (%esi,%edx,1),%xmm2\n"
+ "lea 0x10(%esi),%esi\n"
+ "movdqa %xmm2,%xmm0\n"
+ "pshufb %xmm4,%xmm0\n"
+ "movdqa %xmm2,%xmm1\n"
+ "pshufb %xmm5,%xmm1\n"
+ "paddusw %xmm1,%xmm0\n"
+ "pshufb %xmm6,%xmm2\n"
+ "paddusw %xmm2,%xmm0\n"
+ "pmulhuw %xmm7,%xmm0\n"
+ "packuswb %xmm0,%xmm0\n"
+ "movd %xmm0,(%edi)\n"
+ "pextrw $0x2,%xmm0,%eax\n"
+ "mov %ax,0x4(%edi)\n"
+ "lea 0x6(%edi),%edi\n"
+ "sub $0x6,%ecx\n"
+ "ja 1b\n"
+ "popa\n"
+ "ret\n"
+);
+#endif // __PIC__
+
+#define HAS_SCALEADDROWS_SSE2
+extern "C" void ScaleAddRows_SSE2(const uint8* src_ptr, int src_stride,
+ uint16* dst_ptr, int src_width,
+ int src_height);
+ asm(
+ ".text\n"
+#if defined(OSX)
+ ".globl _ScaleAddRows_SSE2\n"
+"_ScaleAddRows_SSE2:\n"
+#else
+ ".global ScaleAddRows_SSE2\n"
+"ScaleAddRows_SSE2:\n"
+#endif
+ "pusha\n"
+ "mov 0x24(%esp),%esi\n"
+ "mov 0x28(%esp),%edx\n"
+ "mov 0x2c(%esp),%edi\n"
+ "mov 0x30(%esp),%ecx\n"
+ "mov 0x34(%esp),%ebx\n"
+ "pxor %xmm7,%xmm7\n"
+
+"1:"
+ "movdqa (%esi),%xmm2\n"
+ "lea (%esi,%edx,1),%eax\n"
+ "movhlps %xmm2,%xmm3\n"
+ "lea -0x1(%ebx),%ebp\n"
+ "punpcklbw %xmm7,%xmm2\n"
+ "punpcklbw %xmm7,%xmm3\n"
+
+"2:"
+ "movdqa (%eax),%xmm0\n"
+ "lea (%eax,%edx,1),%eax\n"
+ "movhlps %xmm0,%xmm1\n"
+ "punpcklbw %xmm7,%xmm0\n"
+ "punpcklbw %xmm7,%xmm1\n"
+ "paddusw %xmm0,%xmm2\n"
+ "paddusw %xmm1,%xmm3\n"
+ "sub $0x1,%ebp\n"
+ "ja 2b\n"
+
+ "movdqa %xmm2,(%edi)\n"
+ "movdqa %xmm3,0x10(%edi)\n"
+ "lea 0x20(%edi),%edi\n"
+ "lea 0x10(%esi),%esi\n"
+ "sub $0x10,%ecx\n"
+ "ja 1b\n"
+ "popa\n"
+ "ret\n"
+);
+
+// Bilinear row filtering combines 16x2 -> 16x1. SSE2 version
+#define HAS_SCALEFILTERROWS_SSE2
+extern "C" void ScaleFilterRows_SSE2(uint8* dst_ptr,
+ const uint8* src_ptr, int src_stride,
+ int dst_width, int source_y_fraction);
+ asm(
+ ".text\n"
+#if defined(OSX)
+ ".globl _ScaleFilterRows_SSE2\n"
+"_ScaleFilterRows_SSE2:\n"
+#else
+ ".global ScaleFilterRows_SSE2\n"
+"ScaleFilterRows_SSE2:\n"
+#endif
+ "push %esi\n"
+ "push %edi\n"
+ "mov 0xc(%esp),%edi\n"
+ "mov 0x10(%esp),%esi\n"
+ "mov 0x14(%esp),%edx\n"
+ "mov 0x18(%esp),%ecx\n"
+ "mov 0x1c(%esp),%eax\n"
+ "cmp $0x0,%eax\n"
+ "je 2f\n"
+ "cmp $0x80,%eax\n"
+ "je 3f\n"
+ "movd %eax,%xmm6\n"
+ "punpcklwd %xmm6,%xmm6\n"
+ "pshufd $0x0,%xmm6,%xmm6\n"
+ "neg %eax\n"
+ "add $0x100,%eax\n"
+ "movd %eax,%xmm5\n"
+ "punpcklwd %xmm5,%xmm5\n"
+ "pshufd $0x0,%xmm5,%xmm5\n"
+ "pxor %xmm7,%xmm7\n"
+
+"1:"
+ "movdqa (%esi),%xmm0\n"
+ "movdqa (%esi,%edx,1),%xmm2\n"
+ "lea 0x10(%esi),%esi\n"
+ "movdqa %xmm0,%xmm1\n"
+ "movdqa %xmm2,%xmm3\n"
+ "punpcklbw %xmm7,%xmm0\n"
+ "punpcklbw %xmm7,%xmm2\n"
+ "punpckhbw %xmm7,%xmm1\n"
+ "punpckhbw %xmm7,%xmm3\n"
+ "pmullw %xmm5,%xmm0\n"
+ "pmullw %xmm5,%xmm1\n"
+ "pmullw %xmm6,%xmm2\n"
+ "pmullw %xmm6,%xmm3\n"
+ "paddusw %xmm2,%xmm0\n"
+ "paddusw %xmm3,%xmm1\n"
+ "psrlw $0x8,%xmm0\n"
+ "psrlw $0x8,%xmm1\n"
+ "packuswb %xmm1,%xmm0\n"
+ "movdqa %xmm0,(%edi)\n"
+ "lea 0x10(%edi),%edi\n"
+ "sub $0x10,%ecx\n"
+ "ja 1b\n"
+ "mov -0x1(%edi),%al\n"
+ "mov %al,(%edi)\n"
+ "pop %edi\n"
+ "pop %esi\n"
+ "ret\n"
+
+"2:"
+ "movdqa (%esi),%xmm0\n"
+ "lea 0x10(%esi),%esi\n"
+ "movdqa %xmm0,(%edi)\n"
+ "lea 0x10(%edi),%edi\n"
+ "sub $0x10,%ecx\n"
+ "ja 2b\n"
+
+ "mov -0x1(%edi),%al\n"
+ "mov %al,(%edi)\n"
+ "pop %edi\n"
+ "pop %esi\n"
+ "ret\n"
+
+"3:"
+ "movdqa (%esi),%xmm0\n"
+ "movdqa (%esi,%edx,1),%xmm2\n"
+ "lea 0x10(%esi),%esi\n"
+ "pavgb %xmm2,%xmm0\n"
+ "movdqa %xmm0,(%edi)\n"
+ "lea 0x10(%edi),%edi\n"
+ "sub $0x10,%ecx\n"
+ "ja 3b\n"
+
+ "mov -0x1(%edi),%al\n"
+ "mov %al,(%edi)\n"
+ "pop %edi\n"
+ "pop %esi\n"
+ "ret\n"
+);
+
+// Bilinear row filtering combines 16x2 -> 16x1. SSSE3 version
+#define HAS_SCALEFILTERROWS_SSSE3
+extern "C" void ScaleFilterRows_SSSE3(uint8* dst_ptr,
+ const uint8* src_ptr, int src_stride,
+ int dst_width, int source_y_fraction);
+ asm(
+ ".text\n"
+#if defined(OSX)
+ ".globl _ScaleFilterRows_SSSE3\n"
+"_ScaleFilterRows_SSSE3:\n"
+#else
+ ".global ScaleFilterRows_SSSE3\n"
+"ScaleFilterRows_SSSE3:\n"
+#endif
+ "push %esi\n"
+ "push %edi\n"
+ "mov 0xc(%esp),%edi\n"
+ "mov 0x10(%esp),%esi\n"
+ "mov 0x14(%esp),%edx\n"
+ "mov 0x18(%esp),%ecx\n"
+ "mov 0x1c(%esp),%eax\n"
+ "cmp $0x0,%eax\n"
+ "je 2f\n"
+ "cmp $0x80,%eax\n"
+ "je 3f\n"
+ "shr %eax\n"
+ "mov %al,%ah\n"
+ "neg %al\n"
+ "add $0x80,%al\n"
+ "movd %eax,%xmm7\n"
+ "punpcklwd %xmm7,%xmm7\n"
+ "pshufd $0x0,%xmm7,%xmm7\n"
+
+"1:"
+ "movdqa (%esi),%xmm0\n"
+ "movdqa (%esi,%edx,1),%xmm2\n"
+ "lea 0x10(%esi),%esi\n"
+ "movdqa %xmm0,%xmm1\n"
+ "punpcklbw %xmm2,%xmm0\n"
+ "punpckhbw %xmm2,%xmm1\n"
+ "pmaddubsw %xmm7,%xmm0\n"
+ "pmaddubsw %xmm7,%xmm1\n"
+ "psrlw $0x7,%xmm0\n"
+ "psrlw $0x7,%xmm1\n"
+ "packuswb %xmm1,%xmm0\n"
+ "movdqa %xmm0,(%edi)\n"
+ "lea 0x10(%edi),%edi\n"
+ "sub $0x10,%ecx\n"
+ "ja 1b\n"
+ "mov -0x1(%edi),%al\n"
+ "mov %al,(%edi)\n"
+ "pop %edi\n"
+ "pop %esi\n"
+ "ret\n"
+
+"2:"
+ "movdqa (%esi),%xmm0\n"
+ "lea 0x10(%esi),%esi\n"
+ "movdqa %xmm0,(%edi)\n"
+ "lea 0x10(%edi),%edi\n"
+ "sub $0x10,%ecx\n"
+ "ja 2b\n"
+ "mov -0x1(%edi),%al\n"
+ "mov %al,(%edi)\n"
+ "pop %edi\n"
+ "pop %esi\n"
+ "ret\n"
+
+"3:"
+ "movdqa (%esi),%xmm0\n"
+ "movdqa (%esi,%edx,1),%xmm2\n"
+ "lea 0x10(%esi),%esi\n"
+ "pavgb %xmm2,%xmm0\n"
+ "movdqa %xmm0,(%edi)\n"
+ "lea 0x10(%edi),%edi\n"
+ "sub $0x10,%ecx\n"
+ "ja 3b\n"
+ "mov -0x1(%edi),%al\n"
+ "mov %al,(%edi)\n"
+ "pop %edi\n"
+ "pop %esi\n"
+ "ret\n"
+);
+
+#elif defined(__x86_64__)
+static void ScaleRowDown8Int_SSE2(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ asm volatile(
+ "lea (%3,%3,2),%%r10\n"
+ "pxor %%xmm7,%%xmm7\n"
+"1:"
+ "movdqa (%0),%%xmm0\n"
+ "movdqa 0x10(%0),%%xmm1\n"
+ "movdqa (%0,%3,1),%%xmm2\n"
+ "movdqa 0x10(%0,%3,1),%%xmm3\n"
+ "pavgb %%xmm2,%%xmm0\n"
+ "pavgb %%xmm3,%%xmm1\n"
+ "movdqa (%0,%3,2),%%xmm2\n"
+ "movdqa 0x10(%0,%3,2),%%xmm3\n"
+ "movdqa (%0,%%r10,1),%%xmm4\n"
+ "movdqa 0x10(%0,%%r10,1),%%xmm5\n"
+ "lea (%0,%3,4),%%r11\n"
+ "lea 0x20(%0),%0\n"
+ "pavgb %%xmm4,%%xmm2\n"
+ "pavgb %%xmm5,%%xmm3\n"
+ "pavgb %%xmm2,%%xmm0\n"
+ "pavgb %%xmm3,%%xmm1\n"
+ "movdqa 0x0(%%r11),%%xmm2\n"
+ "movdqa 0x10(%%r11),%%xmm3\n"
+ "movdqa 0x0(%%r11,%3,1),%%xmm4\n"
+ "movdqa 0x10(%%r11,%3,1),%%xmm5\n"
+ "pavgb %%xmm4,%%xmm2\n"
+ "pavgb %%xmm5,%%xmm3\n"
+ "movdqa 0x0(%%r11,%3,2),%%xmm4\n"
+ "movdqa 0x10(%%r11,%3,2),%%xmm5\n"
+ "movdqa 0x0(%%r11,%%r10,1),%%xmm6\n"
+ "pavgb %%xmm6,%%xmm4\n"
+ "movdqa 0x10(%%r11,%%r10,1),%%xmm6\n"
+ "pavgb %%xmm6,%%xmm5\n"
+ "pavgb %%xmm4,%%xmm2\n"
+ "pavgb %%xmm5,%%xmm3\n"
+ "pavgb %%xmm2,%%xmm0\n"
+ "pavgb %%xmm3,%%xmm1\n"
+ "psadbw %%xmm7,%%xmm0\n"
+ "psadbw %%xmm7,%%xmm1\n"
+ "pshufd $0xd8,%%xmm0,%%xmm0\n"
+ "pshufd $0x8d,%%xmm1,%%xmm1\n"
+ "por %%xmm1,%%xmm0\n"
+ "psrlw $0x3,%%xmm0\n"
+ "packuswb %%xmm0,%%xmm0\n"
+ "packuswb %%xmm0,%%xmm0\n"
+ "movd %%xmm0,(%1)\n"
+ "lea 0x4(%1),%1\n"
+ "sub $0x4,%2\n"
+ "ja 1b\n"
+ : "+r"(src_ptr), // %0
+ "+r"(dst_ptr), // %1
+ "+r"(dst_width) // %2
+ : "r"(static_cast<intptr_t>(src_stride)) // %3
+ : "memory", "r10", "r11", "xmm0", "xmm1", "xmm2", "xmm3",
+ "xmm4", "xmm5", "xmm6", "xmm7"
+);
+}
+
+#define HAS_SCALEROWDOWN34_SSSE3
+static void ScaleRowDown34_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ asm volatile(
+ "movdqa (%3),%%xmm3\n"
+ "movdqa (%4),%%xmm4\n"
+ "movdqa (%5),%%xmm5\n"
+"1:"
+ "movdqa (%0),%%xmm0\n"
+ "movdqa 0x10(%0),%%xmm2\n"
+ "lea 0x20(%0),%0\n"
+ "movdqa %%xmm2,%%xmm1\n"
+ "palignr $0x8,%%xmm0,%%xmm1\n"
+ "pshufb %%xmm3,%%xmm0\n"
+ "pshufb %%xmm4,%%xmm1\n"
+ "pshufb %%xmm5,%%xmm2\n"
+ "movq %%xmm0,(%1)\n"
+ "movq %%xmm1,0x8(%1)\n"
+ "movq %%xmm2,0x10(%1)\n"
+ "lea 0x18(%1),%1\n"
+ "sub $0x18,%2\n"
+ "ja 1b\n"
+ : "+r"(src_ptr), // %0
+ "+r"(dst_ptr), // %1
+ "+r"(dst_width) // %2
+ : "r"(_shuf0), // %3
+ "r"(_shuf1), // %4
+ "r"(_shuf2) // %5
+ : "memory", "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5"
+);
+}
+
+static void ScaleRowDown34_1_Int_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ asm volatile(
+ "movdqa (%4),%%xmm2\n" // _shuf01
+ "movdqa (%5),%%xmm3\n" // _shuf11
+ "movdqa (%6),%%xmm4\n" // _shuf21
+ "movdqa (%7),%%xmm5\n" // _madd01
+ "movdqa (%8),%%xmm6\n" // _madd11
+ "movdqa (%9),%%xmm7\n" // _round34
+ "movdqa (%10),%%xmm8\n" // _madd21
+"1:"
+ "movdqa (%0),%%xmm0\n"
+ "movdqa (%0,%3),%%xmm1\n"
+ "pavgb %%xmm1,%%xmm0\n"
+ "pshufb %%xmm2,%%xmm0\n"
+ "pmaddubsw %%xmm5,%%xmm0\n"
+ "paddsw %%xmm7,%%xmm0\n"
+ "psrlw $0x2,%%xmm0\n"
+ "packuswb %%xmm0,%%xmm0\n"
+ "movq %%xmm0,(%1)\n"
+ "movdqu 0x8(%0),%%xmm0\n"
+ "movdqu 0x8(%0,%3),%%xmm1\n"
+ "pavgb %%xmm1,%%xmm0\n"
+ "pshufb %%xmm3,%%xmm0\n"
+ "pmaddubsw %%xmm6,%%xmm0\n"
+ "paddsw %%xmm7,%%xmm0\n"
+ "psrlw $0x2,%%xmm0\n"
+ "packuswb %%xmm0,%%xmm0\n"
+ "movq %%xmm0,0x8(%1)\n"
+ "movdqa 0x10(%0),%%xmm0\n"
+ "movdqa 0x10(%0,%3),%%xmm1\n"
+ "lea 0x20(%0),%0\n"
+ "pavgb %%xmm1,%%xmm0\n"
+ "pshufb %%xmm4,%%xmm0\n"
+ "pmaddubsw %%xmm8,%%xmm0\n"
+ "paddsw %%xmm7,%%xmm0\n"
+ "psrlw $0x2,%%xmm0\n"
+ "packuswb %%xmm0,%%xmm0\n"
+ "movq %%xmm0,0x10(%1)\n"
+ "lea 0x18(%1),%1\n"
+ "sub $0x18,%2\n"
+ "ja 1b\n"
+ : "+r"(src_ptr), // %0
+ "+r"(dst_ptr), // %1
+ "+r"(dst_width) // %2
+ : "r"(static_cast<intptr_t>(src_stride)), // %3
+ "r"(_shuf01), // %4
+ "r"(_shuf11), // %5
+ "r"(_shuf21), // %6
+ "r"(_madd01), // %7
+ "r"(_madd11), // %8
+ "r"(_round34), // %9
+ "r"(_madd21) // %10
+ : "memory", "xmm0", "xmm1", "xmm2", "xmm3",
+ "xmm4", "xmm5", "xmm6", "xmm7", "xmm8"
+);
+}
+
+static void ScaleRowDown34_0_Int_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ asm volatile(
+ "movdqa (%4),%%xmm2\n" // _shuf01
+ "movdqa (%5),%%xmm3\n" // _shuf11
+ "movdqa (%6),%%xmm4\n" // _shuf21
+ "movdqa (%7),%%xmm5\n" // _madd01
+ "movdqa (%8),%%xmm6\n" // _madd11
+ "movdqa (%9),%%xmm7\n" // _round34
+ "movdqa (%10),%%xmm8\n" // _madd21
+"1:"
+ "movdqa (%0),%%xmm0\n"
+ "movdqa (%0,%3,1),%%xmm1\n"
+ "pavgb %%xmm0,%%xmm1\n"
+ "pavgb %%xmm1,%%xmm0\n"
+ "pshufb %%xmm2,%%xmm0\n"
+ "pmaddubsw %%xmm5,%%xmm0\n"
+ "paddsw %%xmm7,%%xmm0\n"
+ "psrlw $0x2,%%xmm0\n"
+ "packuswb %%xmm0,%%xmm0\n"
+ "movq %%xmm0,(%1)\n"
+ "movdqu 0x8(%0),%%xmm0\n"
+ "movdqu 0x8(%0,%3,1),%%xmm1\n"
+ "pavgb %%xmm0,%%xmm1\n"
+ "pavgb %%xmm1,%%xmm0\n"
+ "pshufb %%xmm3,%%xmm0\n"
+ "pmaddubsw %%xmm6,%%xmm0\n"
+ "paddsw %%xmm7,%%xmm0\n"
+ "psrlw $0x2,%%xmm0\n"
+ "packuswb %%xmm0,%%xmm0\n"
+ "movq %%xmm0,0x8(%1)\n"
+ "movdqa 0x10(%0),%%xmm0\n"
+ "movdqa 0x10(%0,%3,1),%%xmm1\n"
+ "lea 0x20(%0),%0\n"
+ "pavgb %%xmm0,%%xmm1\n"
+ "pavgb %%xmm1,%%xmm0\n"
+ "pshufb %%xmm4,%%xmm0\n"
+ "pmaddubsw %%xmm8,%%xmm0\n"
+ "paddsw %%xmm7,%%xmm0\n"
+ "psrlw $0x2,%%xmm0\n"
+ "packuswb %%xmm0,%%xmm0\n"
+ "movq %%xmm0,0x10(%1)\n"
+ "lea 0x18(%1),%1\n"
+ "sub $0x18,%2\n"
+ "ja 1b\n"
+ : "+r"(src_ptr), // %0
+ "+r"(dst_ptr), // %1
+ "+r"(dst_width) // %2
+ : "r"(static_cast<intptr_t>(src_stride)), // %3
+ "r"(_shuf01), // %4
+ "r"(_shuf11), // %5
+ "r"(_shuf21), // %6
+ "r"(_madd01), // %7
+ "r"(_madd11), // %8
+ "r"(_round34), // %9
+ "r"(_madd21) // %10
+ : "memory", "xmm0", "xmm1", "xmm2", "xmm3",
+ "xmm4", "xmm5", "xmm6", "xmm7", "xmm8"
+);
+}
+
+#define HAS_SCALEROWDOWN38_SSSE3
+static void ScaleRowDown38_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ asm volatile(
+ "movdqa (%3),%%xmm5\n"
+ "movdqa (%4),%%xmm6\n"
+ "pxor %%xmm7,%%xmm7\n"
+"1:"
+ "movdqa (%0),%%xmm0\n"
+ "movdqa 0x10(%0),%%xmm1\n"
+ "lea 0x20(%0),%0\n"
+ "pshufb %%xmm5,%%xmm0\n"
+ "pshufb %%xmm6,%%xmm1\n"
+ "paddusb %%xmm1,%%xmm0\n"
+ "movq %%xmm0,(%1)\n"
+ "movhlps %%xmm0,%%xmm1\n"
+ "movd %%xmm1,0x8(%1)\n"
+ "lea 0xc(%1),%1\n"
+ "sub $0xc,%2\n"
+ "ja 1b\n"
+ : "+r"(src_ptr), // %0
+ "+r"(dst_ptr), // %1
+ "+r"(dst_width) // %2
+ : "r"(_shuf38a), // %3
+ "r"(_shuf38b) // %4
+ : "memory", "xmm0", "xmm1", "xmm5", "xmm6", "xmm7"
+);
+}
+
+static void ScaleRowDown38_3_Int_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ asm volatile(
+ "movdqa (%4),%%xmm4\n"
+ "movdqa (%5),%%xmm5\n"
+ "movdqa (%6),%%xmm6\n"
+ "pxor %%xmm7,%%xmm7\n"
+"1:"
+ "movdqa (%0),%%xmm0\n"
+ "movdqa (%0,%3,1),%%xmm2\n"
+ "movhlps %%xmm0,%%xmm1\n"
+ "movhlps %%xmm2,%%xmm3\n"
+ "punpcklbw %%xmm7,%%xmm0\n"
+ "punpcklbw %%xmm7,%%xmm1\n"
+ "punpcklbw %%xmm7,%%xmm2\n"
+ "punpcklbw %%xmm7,%%xmm3\n"
+ "paddusw %%xmm2,%%xmm0\n"
+ "paddusw %%xmm3,%%xmm1\n"
+ "movdqa (%0,%3,2),%%xmm2\n"
+ "lea 0x10(%0),%0\n"
+ "movhlps %%xmm2,%%xmm3\n"
+ "punpcklbw %%xmm7,%%xmm2\n"
+ "punpcklbw %%xmm7,%%xmm3\n"
+ "paddusw %%xmm2,%%xmm0\n"
+ "paddusw %%xmm3,%%xmm1\n"
+ "movdqa %%xmm0,%%xmm2\n"
+ "psrldq $0x2,%%xmm0\n"
+ "paddusw %%xmm0,%%xmm2\n"
+ "psrldq $0x2,%%xmm0\n"
+ "paddusw %%xmm0,%%xmm2\n"
+ "pshufb %%xmm4,%%xmm2\n"
+ "movdqa %%xmm1,%%xmm3\n"
+ "psrldq $0x2,%%xmm1\n"
+ "paddusw %%xmm1,%%xmm3\n"
+ "psrldq $0x2,%%xmm1\n"
+ "paddusw %%xmm1,%%xmm3\n"
+ "pshufb %%xmm5,%%xmm3\n"
+ "paddusw %%xmm3,%%xmm2\n"
+ "pmulhuw %%xmm6,%%xmm2\n"
+ "packuswb %%xmm2,%%xmm2\n"
+ "movd %%xmm2,(%1)\n"
+ "pextrw $0x2,%%xmm2,%%eax\n"
+ "mov %%ax,0x4(%1)\n"
+ "lea 0x6(%1),%1\n"
+ "sub $0x6,%2\n"
+ "ja 1b\n"
+ : "+r"(src_ptr), // %0
+ "+r"(dst_ptr), // %1
+ "+r"(dst_width) // %2
+ : "r"(static_cast<intptr_t>(src_stride)), // %3
+ "r"(_shufac0), // %4
+ "r"(_shufac3), // %5
+ "r"(_scaleac3) // %6
+ : "memory", "rax", "xmm0", "xmm1", "xmm2", "xmm3",
+ "xmm4", "xmm5", "xmm6", "xmm7"
+);
+}
+
+static void ScaleRowDown38_2_Int_SSSE3(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ asm volatile(
+ "movdqa (%4),%%xmm4\n"
+ "movdqa (%5),%%xmm5\n"
+ "movdqa (%6),%%xmm6\n"
+ "movdqa (%7),%%xmm7\n"
+"1:"
+ "movdqa (%0),%%xmm2\n"
+ "pavgb (%0,%3,1),%%xmm2\n"
+ "lea 0x10(%0),%0\n"
+ "movdqa %%xmm2,%%xmm0\n"
+ "pshufb %%xmm4,%%xmm0\n"
+ "movdqa %%xmm2,%%xmm1\n"
+ "pshufb %%xmm5,%%xmm1\n"
+ "paddusw %%xmm1,%%xmm0\n"
+ "pshufb %%xmm6,%%xmm2\n"
+ "paddusw %%xmm2,%%xmm0\n"
+ "pmulhuw %%xmm7,%%xmm0\n"
+ "packuswb %%xmm0,%%xmm0\n"
+ "movd %%xmm0,(%1)\n"
+ "pextrw $0x2,%%xmm0,%%eax\n"
+ "mov %%ax,0x4(%1)\n"
+ "lea 0x6(%1),%1\n"
+ "sub $0x6,%2\n"
+ "ja 1b\n"
+ : "+r"(src_ptr), // %0
+ "+r"(dst_ptr), // %1
+ "+r"(dst_width) // %2
+ : "r"(static_cast<intptr_t>(src_stride)), // %3
+ "r"(_shufab0), // %4
+ "r"(_shufab1), // %5
+ "r"(_shufab2), // %6
+ "r"(_scaleab2) // %7
+ : "memory", "rax", "xmm0", "xmm1", "xmm2",
+ "xmm4", "xmm5", "xmm6", "xmm7"
+);
+}
+
+#define HAS_SCALEADDROWS_SSE2
+static void ScaleAddRows_SSE2(const uint8* src_ptr, int src_stride,
+ uint16* dst_ptr, int src_width,
+ int src_height) {
+ asm volatile(
+ "pxor %%xmm7,%%xmm7\n"
+"1:"
+ "movdqa (%0),%%xmm2\n"
+ "lea (%0,%4,1),%%r10\n"
+ "movhlps %%xmm2,%%xmm3\n"
+ "lea -0x1(%3),%%r11\n"
+ "punpcklbw %%xmm7,%%xmm2\n"
+ "punpcklbw %%xmm7,%%xmm3\n"
+
+"2:"
+ "movdqa (%%r10),%%xmm0\n"
+ "lea (%%r10,%4,1),%%r10\n"
+ "movhlps %%xmm0,%%xmm1\n"
+ "punpcklbw %%xmm7,%%xmm0\n"
+ "punpcklbw %%xmm7,%%xmm1\n"
+ "paddusw %%xmm0,%%xmm2\n"
+ "paddusw %%xmm1,%%xmm3\n"
+ "sub $0x1,%%r11\n"
+ "ja 2b\n"
+
+ "movdqa %%xmm2,(%1)\n"
+ "movdqa %%xmm3,0x10(%1)\n"
+ "lea 0x20(%1),%1\n"
+ "lea 0x10(%0),%0\n"
+ "sub $0x10,%2\n"
+ "ja 1b\n"
+ : "+r"(src_ptr), // %0
+ "+r"(dst_ptr), // %1
+ "+r"(src_width), // %2
+ "+r"(src_height) // %3
+ : "r"(static_cast<intptr_t>(src_stride)) // %4
+ : "memory", "r10", "r11", "xmm0", "xmm1", "xmm2", "xmm3", "xmm7"
+);
+}
+
+// Bilinear row filtering combines 16x2 -> 16x1. SSE2 version
+#define HAS_SCALEFILTERROWS_SSE2
+static void ScaleFilterRows_SSE2(uint8* dst_ptr,
+ const uint8* src_ptr, int src_stride,
+ int dst_width, int source_y_fraction) {
+ if (source_y_fraction == 0) {
+ asm volatile(
+ "1:"
+ "movdqa (%1),%%xmm0\n"
+ "lea 0x10(%1),%1\n"
+ "movdqa %%xmm0,(%0)\n"
+ "lea 0x10(%0),%0\n"
+ "sub $0x10,%2\n"
+ "ja 1b\n"
+ "mov -0x1(%0),%%al\n"
+ "mov %%al,(%0)\n"
+ : "+r"(dst_ptr), // %0
+ "+r"(src_ptr), // %1
+ "+r"(dst_width) // %2
+ :
+ : "memory", "rax", "xmm0"
+ );
+ return;
+ } else if (source_y_fraction == 128) {
+ asm volatile(
+ "1:"
+ "movdqa (%1),%%xmm0\n"
+ "movdqa (%1,%3,1),%%xmm2\n"
+ "lea 0x10(%1),%1\n"
+ "pavgb %%xmm2,%%xmm0\n"
+ "movdqa %%xmm0,(%0)\n"
+ "lea 0x10(%0),%0\n"
+ "sub $0x10,%2\n"
+ "ja 1b\n"
+ "mov -0x1(%0),%%al\n"
+ "mov %%al,(%0)\n"
+ : "+r"(dst_ptr), // %0
+ "+r"(src_ptr), // %1
+ "+r"(dst_width) // %2
+ : "r"(static_cast<intptr_t>(src_stride)) // %3
+ : "memory", "rax", "xmm0", "xmm2"
+ );
+ return;
+ } else {
+ asm volatile(
+ "mov %3,%%eax\n"
+ "movd %%eax,%%xmm6\n"
+ "punpcklwd %%xmm6,%%xmm6\n"
+ "pshufd $0x0,%%xmm6,%%xmm6\n"
+ "neg %%eax\n"
+ "add $0x100,%%eax\n"
+ "movd %%eax,%%xmm5\n"
+ "punpcklwd %%xmm5,%%xmm5\n"
+ "pshufd $0x0,%%xmm5,%%xmm5\n"
+ "pxor %%xmm7,%%xmm7\n"
+ "1:"
+ "movdqa (%1),%%xmm0\n"
+ "movdqa (%1,%4,1),%%xmm2\n"
+ "lea 0x10(%1),%1\n"
+ "movdqa %%xmm0,%%xmm1\n"
+ "movdqa %%xmm2,%%xmm3\n"
+ "punpcklbw %%xmm7,%%xmm0\n"
+ "punpcklbw %%xmm7,%%xmm2\n"
+ "punpckhbw %%xmm7,%%xmm1\n"
+ "punpckhbw %%xmm7,%%xmm3\n"
+ "pmullw %%xmm5,%%xmm0\n"
+ "pmullw %%xmm5,%%xmm1\n"
+ "pmullw %%xmm6,%%xmm2\n"
+ "pmullw %%xmm6,%%xmm3\n"
+ "paddusw %%xmm2,%%xmm0\n"
+ "paddusw %%xmm3,%%xmm1\n"
+ "psrlw $0x8,%%xmm0\n"
+ "psrlw $0x8,%%xmm1\n"
+ "packuswb %%xmm1,%%xmm0\n"
+ "movdqa %%xmm0,(%0)\n"
+ "lea 0x10(%0),%0\n"
+ "sub $0x10,%2\n"
+ "ja 1b\n"
+ "mov -0x1(%0),%%al\n"
+ "mov %%al,(%0)\n"
+ : "+r"(dst_ptr), // %0
+ "+r"(src_ptr), // %1
+ "+r"(dst_width), // %2
+ "+r"(source_y_fraction) // %3
+ : "r"(static_cast<intptr_t>(src_stride)) // %4
+ : "memory", "rax", "xmm0", "xmm1", "xmm2", "xmm3",
+ "xmm5", "xmm6", "xmm7"
+ );
+ }
+ return;
+}
+
+// Bilinear row filtering combines 16x2 -> 16x1. SSSE3 version
+#define HAS_SCALEFILTERROWS_SSSE3
+static void ScaleFilterRows_SSSE3(uint8* dst_ptr,
+ const uint8* src_ptr, int src_stride,
+ int dst_width, int source_y_fraction) {
+ if (source_y_fraction == 0) {
+ asm volatile(
+ "1:"
+ "movdqa (%1),%%xmm0\n"
+ "lea 0x10(%1),%1\n"
+ "movdqa %%xmm0,(%0)\n"
+ "lea 0x10(%0),%0\n"
+ "sub $0x10,%2\n"
+ "ja 1b\n"
+ "mov -0x1(%0),%%al\n"
+ "mov %%al,(%0)\n"
+ : "+r"(dst_ptr), // %0
+ "+r"(src_ptr), // %1
+ "+r"(dst_width) // %2
+ :
+ : "memory", "rax", "xmm0"
+ );
+ return;
+ } else if (source_y_fraction == 128) {
+ asm volatile(
+ "1:"
+ "movdqa (%1),%%xmm0\n"
+ "movdqa (%1,%3,1),%%xmm2\n"
+ "lea 0x10(%1),%1\n"
+ "pavgb %%xmm2,%%xmm0\n"
+ "movdqa %%xmm0,(%0)\n"
+ "lea 0x10(%0),%0\n"
+ "sub $0x10,%2\n"
+ "ja 1b\n"
+ "mov -0x1(%0),%%al\n"
+ "mov %%al,(%0)\n"
+ : "+r"(dst_ptr), // %0
+ "+r"(src_ptr), // %1
+ "+r"(dst_width) // %2
+ : "r"(static_cast<intptr_t>(src_stride)) // %3
+ : "memory", "rax", "xmm0", "xmm2"
+ );
+ return;
+ } else {
+ asm volatile(
+ "mov %3,%%eax\n"
+ "shr %%eax\n"
+ "mov %%al,%%ah\n"
+ "neg %%al\n"
+ "add $0x80,%%al\n"
+ "movd %%eax,%%xmm7\n"
+ "punpcklwd %%xmm7,%%xmm7\n"
+ "pshufd $0x0,%%xmm7,%%xmm7\n"
+ "1:"
+ "movdqa (%1),%%xmm0\n"
+ "movdqa (%1,%4,1),%%xmm2\n"
+ "lea 0x10(%1),%1\n"
+ "movdqa %%xmm0,%%xmm1\n"
+ "punpcklbw %%xmm2,%%xmm0\n"
+ "punpckhbw %%xmm2,%%xmm1\n"
+ "pmaddubsw %%xmm7,%%xmm0\n"
+ "pmaddubsw %%xmm7,%%xmm1\n"
+ "psrlw $0x7,%%xmm0\n"
+ "psrlw $0x7,%%xmm1\n"
+ "packuswb %%xmm1,%%xmm0\n"
+ "movdqa %%xmm0,(%0)\n"
+ "lea 0x10(%0),%0\n"
+ "sub $0x10,%2\n"
+ "ja 1b\n"
+ "mov -0x1(%0),%%al\n"
+ "mov %%al,(%0)\n"
+ : "+r"(dst_ptr), // %0
+ "+r"(src_ptr), // %1
+ "+r"(dst_width), // %2
+ "+r"(source_y_fraction) // %3
+ : "r"(static_cast<intptr_t>(src_stride)) // %4
+ : "memory", "rax", "xmm0", "xmm1", "xmm2", "xmm7"
+ );
+ }
+ return;
+}
+#endif
+#endif
+
+// CPU agnostic row functions
+static void ScaleRowDown2_C(const uint8* src_ptr, int,
+ uint8* dst, int dst_width) {
+ for (int x = 0; x < dst_width; ++x) {
+ *dst++ = *src_ptr;
+ src_ptr += 2;
+ }
+}
+
+static void ScaleRowDown2Int_C(const uint8* src_ptr, int src_stride,
+ uint8* dst, int dst_width) {
+ for (int x = 0; x < dst_width; ++x) {
+ *dst++ = (src_ptr[0] + src_ptr[1] +
+ src_ptr[src_stride] + src_ptr[src_stride + 1] + 2) >> 2;
+ src_ptr += 2;
+ }
+}
+
+static void ScaleRowDown4_C(const uint8* src_ptr, int,
+ uint8* dst, int dst_width) {
+ for (int x = 0; x < dst_width; ++x) {
+ *dst++ = *src_ptr;
+ src_ptr += 4;
+ }
+}
+
+static void ScaleRowDown4Int_C(const uint8* src_ptr, int src_stride,
+ uint8* dst, int dst_width) {
+ for (int x = 0; x < dst_width; ++x) {
+ *dst++ = (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[3] +
+ src_ptr[src_stride + 0] + src_ptr[src_stride + 1] +
+ src_ptr[src_stride + 2] + src_ptr[src_stride + 3] +
+ src_ptr[src_stride * 2 + 0] + src_ptr[src_stride * 2 + 1] +
+ src_ptr[src_stride * 2 + 2] + src_ptr[src_stride * 2 + 3] +
+ src_ptr[src_stride * 3 + 0] + src_ptr[src_stride * 3 + 1] +
+ src_ptr[src_stride * 3 + 2] + src_ptr[src_stride * 3 + 3] +
+ 8) >> 4;
+ src_ptr += 4;
+ }
+}
+
+// 640 output pixels is enough to allow 5120 input pixels with 1/8 scale down.
+// Keeping the total buffer under 4096 bytes avoids a stackcheck, saving 4% cpu.
+static const int kMaxOutputWidth = 640;
+static const int kMaxRow12 = kMaxOutputWidth * 2;
+
+static void ScaleRowDown8_C(const uint8* src_ptr, int,
+ uint8* dst, int dst_width) {
+ for (int x = 0; x < dst_width; ++x) {
+ *dst++ = *src_ptr;
+ src_ptr += 8;
+ }
+}
+
+// Note calling code checks width is less than max and if not
+// uses ScaleRowDown8_C instead.
+static void ScaleRowDown8Int_C(const uint8* src_ptr, int src_stride,
+ uint8* dst, int dst_width) {
+ ALIGN16(uint8 src_row[kMaxRow12 * 2]);
+ assert(dst_width <= kMaxOutputWidth);
+ ScaleRowDown4Int_C(src_ptr, src_stride, src_row, dst_width * 2);
+ ScaleRowDown4Int_C(src_ptr + src_stride * 4, src_stride,
+ src_row + kMaxOutputWidth,
+ dst_width * 2);
+ ScaleRowDown2Int_C(src_row, kMaxOutputWidth, dst, dst_width);
+}
+
+static void ScaleRowDown34_C(const uint8* src_ptr, int,
+ uint8* dst, int dst_width) {
+ assert((dst_width % 3 == 0) && (dst_width > 0));
+ uint8* dend = dst + dst_width;
+ do {
+ dst[0] = src_ptr[0];
+ dst[1] = src_ptr[1];
+ dst[2] = src_ptr[3];
+ dst += 3;
+ src_ptr += 4;
+ } while (dst < dend);
+}
+
+// Filter rows 0 and 1 together, 3 : 1
+static void ScaleRowDown34_0_Int_C(const uint8* src_ptr, int src_stride,
+ uint8* d, int dst_width) {
+ assert((dst_width % 3 == 0) && (dst_width > 0));
+ uint8* dend = d + dst_width;
+ const uint8* s = src_ptr;
+ const uint8* t = src_ptr + src_stride;
+ do {
+ 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;
+ } while (d < dend);
+}
+
+// Filter rows 1 and 2 together, 1 : 1
+static void ScaleRowDown34_1_Int_C(const uint8* src_ptr, int src_stride,
+ uint8* d, int dst_width) {
+ assert((dst_width % 3 == 0) && (dst_width > 0));
+ uint8* dend = d + dst_width;
+ const uint8* s = src_ptr;
+ const uint8* t = src_ptr + src_stride;
+ do {
+ 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;
+ } while (d < dend);
+}
+
+#if defined(HAS_SCALEFILTERROWS_SSE2)
+// Filter row to 3/4
+static void ScaleFilterCols34_C(uint8* dst_ptr, const uint8* src_ptr,
+ int dst_width) {
+ assert((dst_width % 3 == 0) && (dst_width > 0));
+ uint8* dend = dst_ptr + dst_width;
+ const uint8* s = src_ptr;
+ do {
+ dst_ptr[0] = (s[0] * 3 + s[1] * 1 + 2) >> 2;
+ dst_ptr[1] = (s[1] * 1 + s[2] * 1 + 1) >> 1;
+ dst_ptr[2] = (s[2] * 1 + s[3] * 3 + 2) >> 2;
+ dst_ptr += 3;
+ s += 4;
+ } while (dst_ptr < dend);
+}
+#endif
+
+static void ScaleFilterCols_C(uint8* dst_ptr, const uint8* src_ptr,
+ int dst_width, int dx) {
+ int x = 0;
+ for (int j = 0; j < dst_width; ++j) {
+ int xi = x >> 16;
+ int xf1 = x & 0xffff;
+ int xf0 = 65536 - xf1;
+
+ *dst_ptr++ = (src_ptr[xi] * xf0 + src_ptr[xi + 1] * xf1) >> 16;
+ x += dx;
+ }
+}
+
+static const int kMaxInputWidth = 2560;
+#if defined(HAS_SCALEFILTERROWS_SSE2)
+#define HAS_SCALEROWDOWN34_SSE2
+// Filter rows 0 and 1 together, 3 : 1
+static void ScaleRowDown34_0_Int_SSE2(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ assert((dst_width % 3 == 0) && (dst_width > 0));
+ ALIGN16(uint8 row[kMaxInputWidth]);
+ ScaleFilterRows_SSE2(row, src_ptr, src_stride, dst_width * 4 / 3,
+ 256 / 4);
+ ScaleFilterCols34_C(dst_ptr, row, dst_width);
+}
+
+// Filter rows 1 and 2 together, 1 : 1
+static void ScaleRowDown34_1_Int_SSE2(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ assert((dst_width % 3 == 0) && (dst_width > 0));
+ ALIGN16(uint8 row[kMaxInputWidth]);
+ ScaleFilterRows_SSE2(row, src_ptr, src_stride, dst_width * 4 / 3, 256 / 2);
+ ScaleFilterCols34_C(dst_ptr, row, dst_width);
+}
+#endif
+
+static void ScaleRowDown38_C(const uint8* src_ptr, int,
+ uint8* dst, int dst_width) {
+ assert(dst_width % 3 == 0);
+ for (int 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
+static void ScaleRowDown38_3_Int_C(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ assert((dst_width % 3 == 0) && (dst_width > 0));
+ for (int i = 0; i < dst_width; i+=3) {
+ dst_ptr[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] +
+ src_ptr[src_stride + 0] + src_ptr[src_stride + 1] +
+ src_ptr[src_stride + 2] + src_ptr[src_stride * 2 + 0] +
+ src_ptr[src_stride * 2 + 1] + src_ptr[src_stride * 2 + 2]) *
+ (65536 / 9) >> 16;
+ dst_ptr[1] = (src_ptr[3] + src_ptr[4] + src_ptr[5] +
+ src_ptr[src_stride + 3] + src_ptr[src_stride + 4] +
+ src_ptr[src_stride + 5] + src_ptr[src_stride * 2 + 3] +
+ src_ptr[src_stride * 2 + 4] + src_ptr[src_stride * 2 + 5]) *
+ (65536 / 9) >> 16;
+ dst_ptr[2] = (src_ptr[6] + src_ptr[7] +
+ src_ptr[src_stride + 6] + src_ptr[src_stride + 7] +
+ src_ptr[src_stride * 2 + 6] + src_ptr[src_stride * 2 + 7]) *
+ (65536 / 6) >> 16;
+ src_ptr += 8;
+ dst_ptr += 3;
+ }
+}
+
+// 8x2 -> 3x1
+static void ScaleRowDown38_2_Int_C(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width) {
+ assert((dst_width % 3 == 0) && (dst_width > 0));
+ for (int i = 0; i < dst_width; i+=3) {
+ dst_ptr[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] +
+ src_ptr[src_stride + 0] + src_ptr[src_stride + 1] +
+ src_ptr[src_stride + 2]) * (65536 / 6) >> 16;
+ dst_ptr[1] = (src_ptr[3] + src_ptr[4] + src_ptr[5] +
+ src_ptr[src_stride + 3] + src_ptr[src_stride + 4] +
+ src_ptr[src_stride + 5]) * (65536 / 6) >> 16;
+ dst_ptr[2] = (src_ptr[6] + src_ptr[7] +
+ src_ptr[src_stride + 6] + src_ptr[src_stride + 7]) *
+ (65536 / 4) >> 16;
+ src_ptr += 8;
+ dst_ptr += 3;
+ }
+}
+
+// C version 8x2 -> 8x1
+static void ScaleFilterRows_C(uint8* dst_ptr,
+ const uint8* src_ptr, int src_stride,
+ int dst_width, int source_y_fraction) {
+ assert(dst_width > 0);
+ int y1_fraction = source_y_fraction;
+ int y0_fraction = 256 - y1_fraction;
+ const uint8* src_ptr1 = src_ptr + src_stride;
+ uint8* end = dst_ptr + dst_width;
+ do {
+ dst_ptr[0] = (src_ptr[0] * y0_fraction + src_ptr1[0] * y1_fraction) >> 8;
+ dst_ptr[1] = (src_ptr[1] * y0_fraction + src_ptr1[1] * y1_fraction) >> 8;
+ dst_ptr[2] = (src_ptr[2] * y0_fraction + src_ptr1[2] * y1_fraction) >> 8;
+ dst_ptr[3] = (src_ptr[3] * y0_fraction + src_ptr1[3] * y1_fraction) >> 8;
+ dst_ptr[4] = (src_ptr[4] * y0_fraction + src_ptr1[4] * y1_fraction) >> 8;
+ dst_ptr[5] = (src_ptr[5] * y0_fraction + src_ptr1[5] * y1_fraction) >> 8;
+ dst_ptr[6] = (src_ptr[6] * y0_fraction + src_ptr1[6] * y1_fraction) >> 8;
+ dst_ptr[7] = (src_ptr[7] * y0_fraction + src_ptr1[7] * y1_fraction) >> 8;
+ src_ptr += 8;
+ src_ptr1 += 8;
+ dst_ptr += 8;
+ } while (dst_ptr < end);
+ dst_ptr[0] = dst_ptr[-1];
+}
+
+void ScaleAddRows_C(const uint8* src_ptr, int src_stride,
+ uint16* dst_ptr, int src_width, int src_height) {
+ assert(src_width > 0);
+ assert(src_height > 0);
+ for (int x = 0; x < src_width; ++x) {
+ const uint8* s = src_ptr + x;
+ int sum = 0;
+ for (int y = 0; y < src_height; ++y) {
+ sum += s[0];
+ s += src_stride;
+ }
+ dst_ptr[x] = sum;
+ }
+}
+
+/**
+ * Scale plane, 1/2
+ *
+ * This is an optimized version for scaling down a plane to 1/2 of
+ * its original size.
+ *
+ */
+static void ScalePlaneDown2(int src_width, int src_height,
+ int dst_width, int dst_height,
+ int src_stride, int dst_stride,
+ const uint8* src_ptr, uint8* dst_ptr,
+ FilterMode filtering) {
+ assert(src_width % 2 == 0);
+ assert(src_height % 2 == 0);
+ void (*ScaleRowDown2)(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width);
+
+#if defined(HAS_SCALEROWDOWN2_NEON)
+ if (libyuv::TestCpuFlag(libyuv::kCpuHasNEON) &&
+ (dst_width % 16 == 0) && (src_stride % 16 == 0) &&
+ (dst_stride % 16 == 0) &&
+ IS_ALIGNED(src_ptr, 16) && IS_ALIGNED(dst_ptr, 16)) {
+ ScaleRowDown2 = filtering ? ScaleRowDown2Int_NEON : ScaleRowDown2_NEON;
+ } else
+#endif
+#if defined(HAS_SCALEROWDOWN2_SSE2)
+ if (libyuv::TestCpuFlag(libyuv::kCpuHasSSE2) &&
+ (dst_width % 16 == 0) && IS_ALIGNED(src_ptr, 16) &&
+ IS_ALIGNED(dst_ptr, 16)) {
+ ScaleRowDown2 = filtering ? ScaleRowDown2Int_SSE2 : ScaleRowDown2_SSE2;
+ } else
+#endif
+ {
+ ScaleRowDown2 = filtering ? ScaleRowDown2Int_C : ScaleRowDown2_C;
+ }
+
+ for (int y = 0; y < dst_height; ++y) {
+ ScaleRowDown2(src_ptr, src_stride, dst_ptr, dst_width);
+ src_ptr += (src_stride << 1);
+ dst_ptr += dst_stride;
+ }
+}
+
+/**
+ * Scale plane, 1/4
+ *
+ * This is an optimized version for scaling down a plane to 1/4 of
+ * its original size.
+ */
+static void ScalePlaneDown4(int src_width, int src_height,
+ int dst_width, int dst_height,
+ int src_stride, int dst_stride,
+ const uint8* src_ptr, uint8* dst_ptr,
+ FilterMode filtering) {
+ assert(src_width % 4 == 0);
+ assert(src_height % 4 == 0);
+ void (*ScaleRowDown4)(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width);
+
+#if defined(HAS_SCALEROWDOWN4_NEON)
+ if (libyuv::TestCpuFlag(libyuv::kCpuHasNEON) &&
+ (dst_width % 2 == 0) && (src_stride % 8 == 0) &&
+ IS_ALIGNED(src_ptr, 8)) {
+ ScaleRowDown4 = filtering ? ScaleRowDown4Int_NEON : ScaleRowDown4_NEON;
+ } else
+#endif
+#if defined(HAS_SCALEROWDOWN4_SSE2)
+ if (libyuv::TestCpuFlag(libyuv::kCpuHasSSE2) &&
+ (dst_width % 8 == 0) && (src_stride % 16 == 0) &&
+ (dst_stride % 8 == 0) &&
+ IS_ALIGNED(src_ptr, 16) && IS_ALIGNED(dst_ptr, 8)) {
+ ScaleRowDown4 = filtering ? ScaleRowDown4Int_SSE2 : ScaleRowDown4_SSE2;
+ } else
+#endif
+ {
+ ScaleRowDown4 = filtering ? ScaleRowDown4Int_C : ScaleRowDown4_C;
+ }
+
+ for (int y = 0; y < dst_height; ++y) {
+ ScaleRowDown4(src_ptr, src_stride, dst_ptr, dst_width);
+ src_ptr += (src_stride << 2);
+ dst_ptr += dst_stride;
+ }
+}
+
+/**
+ * Scale plane, 1/8
+ *
+ * This is an optimized version for scaling down a plane to 1/8
+ * of its original size.
+ *
+ */
+static void ScalePlaneDown8(int src_width, int src_height,
+ int dst_width, int dst_height,
+ int src_stride, int dst_stride,
+ const uint8* src_ptr, uint8* dst_ptr,
+ FilterMode filtering) {
+ assert(src_width % 8 == 0);
+ assert(src_height % 8 == 0);
+ void (*ScaleRowDown8)(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width);
+#if defined(HAS_SCALEROWDOWN8_SSE2)
+ if (libyuv::TestCpuFlag(libyuv::kCpuHasSSE2) &&
+ (dst_width % 16 == 0) && dst_width <= kMaxOutputWidth &&
+ (src_stride % 16 == 0) && (dst_stride % 16 == 0) &&
+ IS_ALIGNED(src_ptr, 16) && IS_ALIGNED(dst_ptr, 16)) {
+ ScaleRowDown8 = filtering ? ScaleRowDown8Int_SSE2 : ScaleRowDown8_SSE2;
+ } else
+#endif
+ {
+ ScaleRowDown8 = filtering && (dst_width <= kMaxOutputWidth) ?
+ ScaleRowDown8Int_C : ScaleRowDown8_C;
+ }
+ for (int y = 0; y < dst_height; ++y) {
+ ScaleRowDown8(src_ptr, src_stride, dst_ptr, dst_width);
+ src_ptr += (src_stride << 3);
+ dst_ptr += dst_stride;
+ }
+}
+
+/**
+ * Scale plane down, 3/4
+ *
+ * Provided by Frank Barchard (fbarchard@google.com)
+ *
+ */
+static void ScalePlaneDown34(int src_width, int src_height,
+ int dst_width, int dst_height,
+ int src_stride, int dst_stride,
+ const uint8* src_ptr, uint8* dst_ptr,
+ FilterMode filtering) {
+ assert(dst_width % 3 == 0);
+ void (*ScaleRowDown34_0)(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width);
+ void (*ScaleRowDown34_1)(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width);
+#if defined(HAS_SCALEROWDOWN34_SSSE3)
+ if (libyuv::TestCpuFlag(libyuv::kCpuHasSSSE3) &&
+ (dst_width % 24 == 0) && (src_stride % 16 == 0) &&
+ (dst_stride % 8 == 0) &&
+ IS_ALIGNED(src_ptr, 16) && IS_ALIGNED(dst_ptr, 8)) {
+ if (!filtering) {
+ ScaleRowDown34_0 = ScaleRowDown34_SSSE3;
+ ScaleRowDown34_1 = ScaleRowDown34_SSSE3;
+ } else {
+ ScaleRowDown34_0 = ScaleRowDown34_0_Int_SSSE3;
+ ScaleRowDown34_1 = ScaleRowDown34_1_Int_SSSE3;
+ }
+ } else
+#endif
+#if defined(HAS_SCALEROWDOWN34_SSE2)
+ if (libyuv::TestCpuFlag(libyuv::kCpuHasSSE2) &&
+ (dst_width % 24 == 0) && (src_stride % 16 == 0) &&
+ (dst_stride % 8 == 0) &&
+ IS_ALIGNED(src_ptr, 16) && IS_ALIGNED(dst_ptr, 8) &&
+ filtering) {
+ ScaleRowDown34_0 = ScaleRowDown34_0_Int_SSE2;
+ ScaleRowDown34_1 = ScaleRowDown34_1_Int_SSE2;
+ } else
+#endif
+ {
+ if (!filtering) {
+ ScaleRowDown34_0 = ScaleRowDown34_C;
+ ScaleRowDown34_1 = ScaleRowDown34_C;
+ } else {
+ ScaleRowDown34_0 = ScaleRowDown34_0_Int_C;
+ ScaleRowDown34_1 = ScaleRowDown34_1_Int_C;
+ }
+ }
+ int src_row = 0;
+ for (int y = 0; y < dst_height; ++y) {
+ switch (src_row) {
+ case 0:
+ ScaleRowDown34_0(src_ptr, src_stride, dst_ptr, dst_width);
+ break;
+
+ case 1:
+ ScaleRowDown34_1(src_ptr, src_stride, dst_ptr, dst_width);
+ break;
+
+ case 2:
+ ScaleRowDown34_0(src_ptr + src_stride, -src_stride,
+ dst_ptr, dst_width);
+ break;
+ }
+ ++src_row;
+ src_ptr += src_stride;
+ dst_ptr += dst_stride;
+ if (src_row >= 3) {
+ src_ptr += src_stride;
+ src_row = 0;
+ }
+ }
+}
+
+/**
+ * Scale plane, 3/8
+ *
+ * This is an optimized version for scaling down a plane to 3/8
+ * of its original size.
+ *
+ * Reduces 16x3 to 6x1
+ */
+static void ScalePlaneDown38(int src_width, int src_height,
+ int dst_width, int dst_height,
+ int src_stride, int dst_stride,
+ const uint8* src_ptr, uint8* dst_ptr,
+ FilterMode filtering) {
+ assert(dst_width % 3 == 0);
+ void (*ScaleRowDown38_3)(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width);
+ void (*ScaleRowDown38_2)(const uint8* src_ptr, int src_stride,
+ uint8* dst_ptr, int dst_width);
+#if defined(HAS_SCALEROWDOWN38_SSSE3)
+ if (libyuv::TestCpuFlag(libyuv::kCpuHasSSSE3) &&
+ (dst_width % 24 == 0) && (src_stride % 16 == 0) &&
+ (dst_stride % 8 == 0) &&
+ IS_ALIGNED(src_ptr, 16) && IS_ALIGNED(dst_ptr, 8)) {
+ if (!filtering) {
+ ScaleRowDown38_3 = ScaleRowDown38_SSSE3;
+ ScaleRowDown38_2 = ScaleRowDown38_SSSE3;
+ } else {
+ ScaleRowDown38_3 = ScaleRowDown38_3_Int_SSSE3;
+ ScaleRowDown38_2 = ScaleRowDown38_2_Int_SSSE3;
+ }
+ } else
+#endif
+ {
+ if (!filtering) {
+ ScaleRowDown38_3 = ScaleRowDown38_C;
+ ScaleRowDown38_2 = ScaleRowDown38_C;
+ } else {
+ ScaleRowDown38_3 = ScaleRowDown38_3_Int_C;
+ ScaleRowDown38_2 = ScaleRowDown38_2_Int_C;
+ }
+ }
+ int src_row = 0;
+ for (int y = 0; y < dst_height; ++y) {
+ switch (src_row) {
+ case 0:
+ case 1:
+ ScaleRowDown38_3(src_ptr, src_stride, dst_ptr, dst_width);
+ src_ptr += src_stride * 3;
+ ++src_row;
+ break;
+
+ case 2:
+ ScaleRowDown38_2(src_ptr, src_stride, dst_ptr, dst_width);
+ src_ptr += src_stride * 2;
+ src_row = 0;
+ break;
+ }
+ dst_ptr += dst_stride;
+ }
+}
+
+inline static uint32 SumBox(int iboxwidth, int iboxheight,
+ int src_stride, const uint8* src_ptr) {
+ assert(iboxwidth > 0);
+ assert(iboxheight > 0);
+ uint32 sum = 0u;
+ for (int y = 0; y < iboxheight; ++y) {
+ for (int x = 0; x < iboxwidth; ++x) {
+ sum += src_ptr[x];
+ }
+ src_ptr += src_stride;
+ }
+ return sum;
+}
+
+static void ScalePlaneBoxRow(int dst_width, int boxheight,
+ int dx, int src_stride,
+ const uint8* src_ptr, uint8* dst_ptr) {
+ int x = 0;
+ for (int i = 0; i < dst_width; ++i) {
+ int ix = x >> 16;
+ x += dx;
+ int boxwidth = (x >> 16) - ix;
+ *dst_ptr++ = SumBox(boxwidth, boxheight, src_stride, src_ptr + ix) /
+ (boxwidth * boxheight);
+ }
+}
+
+inline static uint32 SumPixels(int iboxwidth, const uint16* src_ptr) {
+ assert(iboxwidth > 0);
+ uint32 sum = 0u;
+ for (int x = 0; x < iboxwidth; ++x) {
+ sum += src_ptr[x];
+ }
+ return sum;
+}
+
+static void ScaleAddCols2_C(int dst_width, int boxheight, int dx,
+ const uint16* src_ptr, uint8* dst_ptr) {
+ int scaletbl[2];
+ int minboxwidth = (dx >> 16);
+ scaletbl[0] = 65536 / (minboxwidth * boxheight);
+ scaletbl[1] = 65536 / ((minboxwidth + 1) * boxheight);
+ int *scaleptr = scaletbl - minboxwidth;
+ int x = 0;
+ for (int i = 0; i < dst_width; ++i) {
+ int ix = x >> 16;
+ x += dx;
+ int boxwidth = (x >> 16) - ix;
+ *dst_ptr++ = SumPixels(boxwidth, src_ptr + ix) * scaleptr[boxwidth] >> 16;
+ }
+}
+
+static void ScaleAddCols1_C(int dst_width, int boxheight, int dx,
+ const uint16* src_ptr, uint8* dst_ptr) {
+ int boxwidth = (dx >> 16);
+ int scaleval = 65536 / (boxwidth * boxheight);
+ int x = 0;
+ for (int i = 0; i < dst_width; ++i) {
+ *dst_ptr++ = SumPixels(boxwidth, src_ptr + x) * scaleval >> 16;
+ x += boxwidth;
+ }
+}
+
+/**
+ * Scale plane down to any dimensions, with interpolation.
+ * (boxfilter).
+ *
+ * Same method as SimpleScale, which is fixed point, outputting
+ * one pixel of destination using fixed point (16.16) to step
+ * through source, sampling a box of pixel with simple
+ * averaging.
+ */
+static void ScalePlaneBox(int src_width, int src_height,
+ int dst_width, int dst_height,
+ int src_stride, int dst_stride,
+ const uint8* src_ptr, uint8* dst_ptr) {
+ assert(dst_width > 0);
+ assert(dst_height > 0);
+ int dy = (src_height << 16) / dst_height;
+ int dx = (src_width << 16) / dst_width;
+ if ((src_width % 16 != 0) || (src_width > kMaxInputWidth) ||
+ dst_height * 2 > src_height) {
+ uint8* dst = dst_ptr;
+ int dy = (src_height << 16) / dst_height;
+ int dx = (src_width << 16) / dst_width;
+ int y = 0;
+ for (int j = 0; j < dst_height; ++j) {
+ int iy = y >> 16;
+ const uint8* const src = src_ptr + iy * src_stride;
+ y += dy;
+ if (y > (src_height << 16)) {
+ y = (src_height << 16);
+ }
+ int boxheight = (y >> 16) - iy;
+ ScalePlaneBoxRow(dst_width, boxheight,
+ dx, src_stride,
+ src, dst);
+
+ dst += dst_stride;
+ }
+ } else {
+ ALIGN16(uint16 row[kMaxInputWidth]);
+ void (*ScaleAddRows)(const uint8* src_ptr, int src_stride,
+ uint16* dst_ptr, int src_width, int src_height);
+ void (*ScaleAddCols)(int dst_width, int boxheight, int dx,
+ const uint16* src_ptr, uint8* dst_ptr);
+#if defined(HAS_SCALEADDROWS_SSE2)
+ if (libyuv::TestCpuFlag(libyuv::kCpuHasSSE2) &&
+ (src_stride % 16 == 0) && IS_ALIGNED(src_ptr, 16) &&
+ (src_width % 16) == 0) {
+ ScaleAddRows = ScaleAddRows_SSE2;
+ } else
+#endif
+ {
+ ScaleAddRows = ScaleAddRows_C;
+ }
+ if (dx & 0xffff) {
+ ScaleAddCols = ScaleAddCols2_C;
+ } else {
+ ScaleAddCols = ScaleAddCols1_C;
+ }
+
+ int y = 0;
+ for (int j = 0; j < dst_height; ++j) {
+ int iy = y >> 16;
+ const uint8* const src = src_ptr + iy * src_stride;
+ y += dy;
+ if (y > (src_height << 16)) {
+ y = (src_height << 16);
+ }
+ int boxheight = (y >> 16) - iy;
+ ScaleAddRows(src, src_stride, row, src_width, boxheight);
+ ScaleAddCols(dst_width, boxheight, dx, row, dst_ptr);
+ dst_ptr += dst_stride;
+ }
+ }
+}
+
+/**
+ * Scale plane to/from any dimensions, with interpolation.
+ */
+static void ScalePlaneBilinearSimple(int src_width, int src_height,
+ int dst_width, int dst_height,
+ int src_stride, int dst_stride,
+ const uint8* src_ptr, uint8* dst_ptr) {
+ uint8* dst = dst_ptr;
+ int dx = (src_width << 16) / dst_width;
+ int dy = (src_height << 16) / dst_height;
+ int maxx = ((src_width - 1) << 16) - 1;
+ int maxy = ((src_height - 1) << 16) - 1;
+ int y = (dst_height < src_height) ? 32768 :
+ (src_height << 16) / dst_height - 32768;
+ for (int i = 0; i < dst_height; ++i) {
+ int cy = (y < 0) ? 0 : y;
+ int yi = cy >> 16;
+ int yf = cy & 0xffff;
+ const uint8* const src = src_ptr + yi * src_stride;
+ int x = (dst_width < src_width) ? 32768 :
+ (src_width << 16) / dst_width - 32768;
+ for (int j = 0; j < dst_width; ++j) {
+ int cx = (x < 0) ? 0 : x;
+ int xi = cx >> 16;
+ int xf = cx & 0xffff;
+ int r0 = (src[xi] * (65536 - xf) + src[xi + 1] * xf) >> 16;
+ int r1 = (src[xi + src_stride] * (65536 - xf) +
+ src[xi + src_stride + 1] * xf) >> 16;
+ *dst++ = (r0 * (65536 - yf) + r1 * yf) >> 16;
+ x += dx;
+ if (x > maxx)
+ x = maxx;
+ }
+ dst += dst_stride - dst_width;
+ y += dy;
+ if (y > maxy)
+ y = maxy;
+ }
+}
+
+/**
+ * Scale plane to/from any dimensions, with bilinear
+ * interpolation.
+ */
+static void ScalePlaneBilinear(int src_width, int src_height,
+ int dst_width, int dst_height,
+ int src_stride, int dst_stride,
+ const uint8* src_ptr, uint8* dst_ptr) {
+ assert(dst_width > 0);
+ assert(dst_height > 0);
+ int dy = (src_height << 16) / dst_height;
+ int dx = (src_width << 16) / dst_width;
+ if ((src_width % 8 != 0) || (src_width > kMaxInputWidth)) {
+ ScalePlaneBilinearSimple(src_width, src_height, dst_width, dst_height,
+ src_stride, dst_stride, src_ptr, dst_ptr);
+
+ } else {
+ ALIGN16(uint8 row[kMaxInputWidth + 1]);
+ void (*ScaleFilterRows)(uint8* dst_ptr, const uint8* src_ptr,
+ int src_stride,
+ int dst_width, int source_y_fraction);
+ void (*ScaleFilterCols)(uint8* dst_ptr, const uint8* src_ptr,
+ int dst_width, int dx);
+#if defined(HAS_SCALEFILTERROWS_SSSE3)
+ if (libyuv::TestCpuFlag(libyuv::kCpuHasSSSE3) &&
+ (src_stride % 16 == 0) && IS_ALIGNED(src_ptr, 16) &&
+ (src_width % 16) == 0) {
+ ScaleFilterRows = ScaleFilterRows_SSSE3;
+ } else
+#endif
+#if defined(HAS_SCALEFILTERROWS_SSE2)
+ if (libyuv::TestCpuFlag(libyuv::kCpuHasSSE2) &&
+ (src_stride % 16 == 0) && IS_ALIGNED(src_ptr, 16) &&
+ (src_width % 16) == 0) {
+ ScaleFilterRows = ScaleFilterRows_SSE2;
+ } else
+#endif
+ {
+ ScaleFilterRows = ScaleFilterRows_C;
+ }
+ ScaleFilterCols = ScaleFilterCols_C;
+
+ int y = 0;
+ int maxy = ((src_height - 1) << 16) - 1; // max is filter of last 2 rows.
+ for (int j = 0; j < dst_height; ++j) {
+ int iy = y >> 16;
+ int fy = (y >> 8) & 255;
+ const uint8* const src = src_ptr + iy * src_stride;
+ ScaleFilterRows(row, src, src_stride, src_width, fy);
+ ScaleFilterCols(dst_ptr, row, dst_width, dx);
+ dst_ptr += dst_stride;
+ y += dy;
+ if (y > maxy) {
+ y = maxy;
+ }
+ }
+ }
+}
+
+/**
+ * Scale plane to/from any dimensions, without interpolation.
+ * Fixed point math is used for performance: The upper 16 bits
+ * of x and dx is the integer part of the source position and
+ * the lower 16 bits are the fixed decimal part.
+ */
+static void ScalePlaneSimple(int src_width, int src_height,
+ int dst_width, int dst_height,
+ int src_stride, int dst_stride,
+ const uint8* src_ptr, uint8* dst_ptr) {
+ uint8* dst = dst_ptr;
+ int dx = (src_width << 16) / dst_width;
+ for (int y = 0; y < dst_height; ++y) {
+ const uint8* const src = src_ptr + (y * src_height / dst_height) *
+ src_stride;
+ // TODO(fbarchard): Round X coordinate by setting x=0x8000.
+ int x = 0;
+ for (int i = 0; i < dst_width; ++i) {
+ *dst++ = src[x >> 16];
+ x += dx;
+ }
+ dst += dst_stride - dst_width;
+ }
+}
+
+/**
+ * Scale plane to/from any dimensions.
+ */
+static void ScalePlaneAnySize(int src_width, int src_height,
+ int dst_width, int dst_height,
+ int src_stride, int dst_stride,
+ const uint8* src_ptr, uint8* dst_ptr,
+ FilterMode filtering) {
+ if (!filtering) {
+ ScalePlaneSimple(src_width, src_height, dst_width, dst_height,
+ src_stride, dst_stride, src_ptr, dst_ptr);
+ } else {
+ // fall back to non-optimized version
+ ScalePlaneBilinear(src_width, src_height, dst_width, dst_height,
+ src_stride, dst_stride, src_ptr, dst_ptr);
+ }
+}
+
+/**
+ * Scale plane down, any size
+ *
+ * This is an optimized version for scaling down a plane to any size.
+ * The current implementation is ~10 times faster compared to the
+ * reference implementation for e.g. XGA->LowResPAL
+ *
+ */
+static void ScalePlaneDown(int src_width, int src_height,
+ int dst_width, int dst_height,
+ int src_stride, int dst_stride,
+ const uint8* src_ptr, uint8* dst_ptr,
+ FilterMode filtering) {
+ if (!filtering) {
+ ScalePlaneSimple(src_width, src_height, dst_width, dst_height,
+ src_stride, dst_stride, src_ptr, dst_ptr);
+ } else if (filtering == kFilterBilinear || src_height * 2 > dst_height) {
+ // between 1/2x and 1x use bilinear
+ ScalePlaneBilinear(src_width, src_height, dst_width, dst_height,
+ src_stride, dst_stride, src_ptr, dst_ptr);
+ } else {
+ ScalePlaneBox(src_width, src_height, dst_width, dst_height,
+ src_stride, dst_stride, src_ptr, dst_ptr);
+ }
+}
+
+/**
+ * Copy plane, no scaling
+ *
+ * This simply copies the given plane without scaling.
+ * The current implementation is ~115 times faster
+ * compared to the reference implementation.
+ *
+ */
+static void CopyPlane(int src_width, int src_height,
+ int dst_width, int dst_height,
+ int src_stride, int dst_stride,
+ const uint8* src_ptr, uint8* dst_ptr) {
+ if (src_stride == src_width && dst_stride == dst_width) {
+ // All contiguous, so can use REALLY fast path.
+ memcpy(dst_ptr, src_ptr, src_width * src_height);
+ } else {
+ // Not all contiguous; must copy scanlines individually
+ const uint8* src = src_ptr;
+ uint8* dst = dst_ptr;
+ for (int i = 0; i < src_height; ++i) {
+ memcpy(dst, src, src_width);
+ dst += dst_stride;
+ src += src_stride;
+ }
+ }
+}
+
+static void ScalePlane(const uint8* src, int src_stride,
+ int src_width, int src_height,
+ uint8* dst, int dst_stride,
+ int dst_width, int dst_height,
+ FilterMode filtering, bool use_ref) {
+ // Use specialized scales to improve performance for common resolutions.
+ // For example, all the 1/2 scalings will use ScalePlaneDown2()
+ if (dst_width == src_width && dst_height == src_height) {
+ // Straight copy.
+ CopyPlane(src_width, src_height, dst_width, dst_height, src_stride,
+ dst_stride, src, dst);
+ } else if (dst_width <= src_width && dst_height <= src_height) {
+ // Scale down.
+ if (use_ref) {
+ // For testing, allow the optimized versions to be disabled.
+ ScalePlaneDown(src_width, src_height, dst_width, dst_height,
+ src_stride, dst_stride, src, dst, filtering);
+ } else if (4 * dst_width == 3 * src_width &&
+ 4 * dst_height == 3 * src_height) {
+ // optimized, 3/4
+ ScalePlaneDown34(src_width, src_height, dst_width, dst_height,
+ src_stride, dst_stride, src, dst, filtering);
+ } else if (2 * dst_width == src_width && 2 * dst_height == src_height) {
+ // optimized, 1/2
+ ScalePlaneDown2(src_width, src_height, dst_width, dst_height,
+ src_stride, dst_stride, src, dst, filtering);
+ // 3/8 rounded up for odd sized chroma height.
+ } else if (8 * dst_width == 3 * src_width &&
+ dst_height == ((src_height * 3 + 7) / 8)) {
+ // optimized, 3/8
+ ScalePlaneDown38(src_width, src_height, dst_width, dst_height,
+ src_stride, dst_stride, src, dst, filtering);
+ } else if (4 * dst_width == src_width && 4 * dst_height == src_height) {
+ // optimized, 1/4
+ ScalePlaneDown4(src_width, src_height, dst_width, dst_height,
+ src_stride, dst_stride, src, dst, filtering);
+ } else if (8 * dst_width == src_width && 8 * dst_height == src_height) {
+ // optimized, 1/8
+ ScalePlaneDown8(src_width, src_height, dst_width, dst_height,
+ src_stride, dst_stride, src, dst, filtering);
+ } else {
+ // Arbitrary downsample
+ ScalePlaneDown(src_width, src_height, dst_width, dst_height,
+ src_stride, dst_stride, src, dst, filtering);
+ }
+ } else {
+ // Arbitrary scale up and/or down.
+ ScalePlaneAnySize(src_width, src_height, dst_width, dst_height,
+ src_stride, dst_stride, src, dst, filtering);
+ }
+}
+
+/**
+ * Scale a plane.
+ *
+ * This function in turn calls a scaling function
+ * suitable for handling the desired resolutions.
+ *
+ */
+
+int I420Scale(const uint8* src_y, int src_stride_y,
+ const uint8* src_u, int src_stride_u,
+ const uint8* src_v, int src_stride_v,
+ int src_width, int src_height,
+ uint8* dst_y, int dst_stride_y,
+ uint8* dst_u, int dst_stride_u,
+ uint8* dst_v, int dst_stride_v,
+ int dst_width, int dst_height,
+ FilterMode filtering) {
+ if (!src_y || !src_u || !src_v || src_width <= 0 || src_height == 0 ||
+ !dst_y || !dst_u || !dst_v || dst_width <= 0 || dst_height <= 0) {
+ return -1;
+ }
+ // Negative height means invert the image.
+ if (src_height < 0) {
+ src_height = -src_height;
+ int halfheight = (src_height + 1) >> 1;
+ src_y = src_y + (src_height - 1) * src_stride_y;
+ src_u = src_u + (halfheight - 1) * src_stride_u;
+ src_v = src_v + (halfheight - 1) * src_stride_v;
+ src_stride_y = -src_stride_y;
+ src_stride_u = -src_stride_u;
+ src_stride_v = -src_stride_v;
+ }
+ int halfsrc_width = (src_width + 1) >> 1;
+ int halfsrc_height = (src_height + 1) >> 1;
+ int halfdst_width = (dst_width + 1) >> 1;
+ int halfoheight = (dst_height + 1) >> 1;
+
+ ScalePlane(src_y, src_stride_y, src_width, src_height,
+ dst_y, dst_stride_y, dst_width, dst_height,
+ filtering, use_reference_impl_);
+ ScalePlane(src_u, src_stride_u, halfsrc_width, halfsrc_height,
+ dst_u, dst_stride_u, halfdst_width, halfoheight,
+ filtering, use_reference_impl_);
+ ScalePlane(src_v, src_stride_v, halfsrc_width, halfsrc_height,
+ dst_v, dst_stride_v, halfdst_width, halfoheight,
+ filtering, use_reference_impl_);
+ return 0;
+}
+
+int Scale(const uint8* src_y, const uint8* src_u, const uint8* src_v,
+ int src_stride_y, int src_stride_u, int src_stride_v,
+ int src_width, int src_height,
+ uint8* dst_y, uint8* dst_u, uint8* dst_v,
+ int dst_stride_y, int dst_stride_u, int dst_stride_v,
+ int dst_width, int dst_height,
+ bool interpolate) {
+ if (!src_y || !src_u || !src_v || src_width <= 0 || src_height == 0 ||
+ !dst_y || !dst_u || !dst_v || dst_width <= 0 || dst_height <= 0) {
+ return -1;
+ }
+ // Negative height means invert the image.
+ if (src_height < 0) {
+ src_height = -src_height;
+ int halfheight = (src_height + 1) >> 1;
+ src_y = src_y + (src_height - 1) * src_stride_y;
+ src_u = src_u + (halfheight - 1) * src_stride_u;
+ src_v = src_v + (halfheight - 1) * src_stride_v;
+ src_stride_y = -src_stride_y;
+ src_stride_u = -src_stride_u;
+ src_stride_v = -src_stride_v;
+ }
+ int halfsrc_width = (src_width + 1) >> 1;
+ int halfsrc_height = (src_height + 1) >> 1;
+ int halfdst_width = (dst_width + 1) >> 1;
+ int halfoheight = (dst_height + 1) >> 1;
+ FilterMode filtering = interpolate ? kFilterBox : kFilterNone;
+
+ ScalePlane(src_y, src_stride_y, src_width, src_height,
+ dst_y, dst_stride_y, dst_width, dst_height,
+ filtering, use_reference_impl_);
+ ScalePlane(src_u, src_stride_u, halfsrc_width, halfsrc_height,
+ dst_u, dst_stride_u, halfdst_width, halfoheight,
+ filtering, use_reference_impl_);
+ ScalePlane(src_v, src_stride_v, halfsrc_width, halfsrc_height,
+ dst_v, dst_stride_v, halfdst_width, halfoheight,
+ filtering, use_reference_impl_);
+ return 0;
+}
+
+int Scale(const uint8* src, int src_width, int src_height,
+ uint8* dst, int dst_width, int dst_height, int ooffset,
+ bool interpolate) {
+ if (!src || src_width <= 0 || src_height <= 0 ||
+ !dst || dst_width <= 0 || dst_height <= 0 || ooffset < 0 ||
+ ooffset >= dst_height) {
+ return -1;
+ }
+ ooffset = ooffset & ~1; // chroma requires offset to multiple of 2.
+ int halfsrc_width = (src_width + 1) >> 1;
+ int halfsrc_height = (src_height + 1) >> 1;
+ int halfdst_width = (dst_width + 1) >> 1;
+ int halfoheight = (dst_height + 1) >> 1;
+ int aheight = dst_height - ooffset * 2; // actual output height
+ const uint8* const iyptr = src;
+ uint8* oyptr = dst + ooffset * dst_width;
+ const uint8* const iuptr = src + src_width * src_height;
+ uint8* ouptr = dst + dst_width * dst_height + (ooffset >> 1) * halfdst_width;
+ const uint8* const ivptr = src + src_width * src_height +
+ halfsrc_width * halfsrc_height;
+ uint8* ovptr = dst + dst_width * dst_height + halfdst_width * halfoheight +
+ (ooffset >> 1) * halfdst_width;
+ return Scale(iyptr, iuptr, ivptr, src_width, halfsrc_width, halfsrc_width,
+ src_width, src_height, oyptr, ouptr, ovptr, dst_width,
+ halfdst_width, halfdst_width, dst_width, aheight, interpolate);
+}
+
+} // namespace libyuv
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-07 08:30:33 +0000