Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1132 insertions, 0 deletions

diff --git a/gfx/ycbcr/scale_yuv_argb.cpp b/gfx/ycbcr/scale_yuv_argb.cpp
new file mode 100644
index 0000000000..2a103fb61e
--- /dev/null
+++ b/gfx/ycbcr/scale_yuv_argb.cpp
@@ -0,0 +1,1132 @@
+/*
+ *  Copyright 2011 The LibYuv Project Authors. All rights reserved.
+ *  Copyright 2016 Mozilla Foundation
+ *
+ *  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/convert_argb.h"
+#include "libyuv/cpu_id.h"
+#include "libyuv/row.h"
+#include "libyuv/scale_row.h"
+#include "libyuv/video_common.h"
+
+#include "mozilla/gfx/Types.h"
+
+#ifdef __cplusplus
+namespace libyuv {
+extern "C" {
+#endif
+
+// YUV to RGB conversion and scaling functions were implemented by referencing
+// scale_argb.cc
+//
+// libyuv already has ScaleYUVToARGBBilinearUp(), but its implementation is not
+// completed yet. Implementations of the functions are based on it.
+// At first, ScaleYUVToARGBBilinearUp() was implemented by modifying the
+// libyuv's one. Then all another functions were implemented similarly.
+//
+// Function relationship between yuv_convert.cpp and scale_argb.cc are like
+// the followings
+//  - ScaleYUVToARGBDown2()      <-- ScaleARGBDown2()
+//  - ScaleYUVToARGBDownEven()   <-- ScaleARGBDownEven()
+//  - ScaleYUVToARGBBilinearDown() <-- ScaleARGBBilinearDown()
+//  - ScaleYUVToARGBBilinearUp() <-- ScaleARGBBilinearUp() and ScaleYUVToARGBBilinearUp() in libyuv
+//  - ScaleYUVToARGBSimple()     <-- ScaleARGBSimple()
+//  - ScaleYUVToARGB()           <-- ScaleARGB() // Removed some function calls for simplicity.
+//  - YUVToARGBScale()           <-- ARGBScale()
+//
+// Callings and selections of InterpolateRow() and ScaleARGBFilterCols() were
+// kept as same as possible.
+//
+// The followings changes were done to each scaling functions.
+//
+// -[1] Allocate YUV conversion buffer and use it as source buffer of scaling.
+//      Its usage is borrowed from the libyuv's ScaleYUVToARGBBilinearUp().
+// -[2] Conversion from YUV to RGB was abstracted as YUVBuferIter.
+//      It is for handling multiple yuv color formats.
+// -[3] Modified scaling functions as to handle YUV conversion buffer and
+//      use YUVBuferIter.
+// -[4] Color conversion function selections in YUVBuferIter were borrowed from
+//      I444ToARGBMatrix(), I422ToARGBMatrix() and I420ToARGBMatrix()
+
+typedef mozilla::gfx::YUVColorSpace YUVColorSpace;
+
+struct YUVBuferIter {
+  int src_width;
+  int src_height;
+  int src_stride_y;
+  int src_stride_u;
+  int src_stride_v;
+  const uint8_t* src_y;
+  const uint8_t* src_u;
+  const uint8_t* src_v;
+
+  uint32_t src_fourcc;
+  const struct YuvConstants* yuvconstants;
+  int y_index;
+  const uint8_t* src_row_y;
+  const uint8_t* src_row_u;
+  const uint8_t* src_row_v;
+
+  void (*YUVToARGBRow)(const uint8_t* y_buf,
+                       const uint8_t* u_buf,
+                       const uint8_t* v_buf,
+                       uint8_t* rgb_buf,
+                       const struct YuvConstants* yuvconstants,
+                       int width);
+  void (*MoveTo)(YUVBuferIter& iter, int y_index);
+  void (*MoveToNextRow)(YUVBuferIter& iter);
+};
+
+void YUVBuferIter_InitI422(YUVBuferIter& iter) {
+  iter.YUVToARGBRow = I422ToARGBRow_C;
+#if defined(HAS_I422TOARGBROW_SSSE3)
+  if (TestCpuFlag(kCpuHasSSSE3)) {
+    iter.YUVToARGBRow = I422ToARGBRow_Any_SSSE3;
+    if (IS_ALIGNED(iter.src_width, 8)) {
+      iter.YUVToARGBRow = I422ToARGBRow_SSSE3;
+    }
+  }
+#endif
+#if defined(HAS_I422TOARGBROW_AVX2)
+  if (TestCpuFlag(kCpuHasAVX2)) {
+    iter.YUVToARGBRow = I422ToARGBRow_Any_AVX2;
+    if (IS_ALIGNED(iter.src_width, 16)) {
+      iter.YUVToARGBRow = I422ToARGBRow_AVX2;
+    }
+  }
+#endif
+#if defined(HAS_I422TOARGBROW_NEON)
+  if (TestCpuFlag(kCpuHasNEON)) {
+    iter.YUVToARGBRow = I422ToARGBRow_Any_NEON;
+    if (IS_ALIGNED(iter.src_width, 8)) {
+      iter.YUVToARGBRow = I422ToARGBRow_NEON;
+    }
+  }
+#endif
+#if defined(HAS_I422TOARGBROW_DSPR2)
+  if (TestCpuFlag(kCpuHasDSPR2) && IS_ALIGNED(iter.src_width, 4) &&
+      IS_ALIGNED(iter.src_y, 4) && IS_ALIGNED(iter.src_stride_y, 4) &&
+      IS_ALIGNED(iter.src_u, 2) && IS_ALIGNED(iter.src_stride_u, 2) &&
+      IS_ALIGNED(iter.src_v, 2) && IS_ALIGNED(iter.src_stride_v, 2) {
+    // Always satisfy IS_ALIGNED(argb_cnv_row, 4) && IS_ALIGNED(argb_cnv_rowstride, 4)
+    iter.YUVToARGBRow = I422ToARGBRow_DSPR2;
+  }
+#endif
+}
+
+void YUVBuferIter_InitI444(YUVBuferIter& iter) {
+  iter.YUVToARGBRow = I444ToARGBRow_C;
+#if defined(HAS_I444TOARGBROW_SSSE3)
+  if (TestCpuFlag(kCpuHasSSSE3)) {
+    iter.YUVToARGBRow = I444ToARGBRow_Any_SSSE3;
+    if (IS_ALIGNED(iter.src_width, 8)) {
+      iter.YUVToARGBRow = I444ToARGBRow_SSSE3;
+    }
+  }
+#endif
+#if defined(HAS_I444TOARGBROW_AVX2)
+  if (TestCpuFlag(kCpuHasAVX2)) {
+    iter.YUVToARGBRow = I444ToARGBRow_Any_AVX2;
+    if (IS_ALIGNED(iter.src_width, 16)) {
+      iter.YUVToARGBRow = I444ToARGBRow_AVX2;
+    }
+  }
+#endif
+#if defined(HAS_I444TOARGBROW_NEON)
+  if (TestCpuFlag(kCpuHasNEON)) {
+    iter.YUVToARGBRow = I444ToARGBRow_Any_NEON;
+    if (IS_ALIGNED(iter.src_width, 8)) {
+      iter.YUVToARGBRow = I444ToARGBRow_NEON;
+    }
+  }
+#endif
+}
+
+
+static void YUVBuferIter_MoveToForI444(YUVBuferIter& iter, int y_index) {
+  iter.y_index = y_index;
+  iter.src_row_y = iter.src_y + y_index * iter.src_stride_y;
+  iter.src_row_u = iter.src_u + y_index * iter.src_stride_u;
+  iter.src_row_v = iter.src_v + y_index * iter.src_stride_v;
+}
+
+static void YUVBuferIter_MoveToNextRowForI444(YUVBuferIter& iter) {
+  iter.src_row_y += iter.src_stride_y;
+  iter.src_row_u += iter.src_stride_u;
+  iter.src_row_v += iter.src_stride_v;
+  iter.y_index++;
+}
+
+static void YUVBuferIter_MoveToForI422(YUVBuferIter& iter, int y_index) {
+  iter.y_index = y_index;
+  iter.src_row_y = iter.src_y + y_index * iter.src_stride_y;
+  iter.src_row_u = iter.src_u + y_index * iter.src_stride_u;
+  iter.src_row_v = iter.src_v + y_index * iter.src_stride_v;
+}
+
+static void YUVBuferIter_MoveToNextRowForI422(YUVBuferIter& iter) {
+  iter.src_row_y += iter.src_stride_y;
+  iter.src_row_u += iter.src_stride_u;
+  iter.src_row_v += iter.src_stride_v;
+  iter.y_index++;
+}
+
+static void YUVBuferIter_MoveToForI420(YUVBuferIter& iter, int y_index) {
+  const int kYShift = 1;  // Shift Y by 1 to convert Y plane to UV coordinate.
+  int uv_y_index = y_index >> kYShift;
+
+  iter.y_index = y_index;
+  iter.src_row_y = iter.src_y + y_index * iter.src_stride_y;
+  iter.src_row_u = iter.src_u + uv_y_index * iter.src_stride_u;
+  iter.src_row_v = iter.src_v + uv_y_index * iter.src_stride_v;
+}
+
+static void YUVBuferIter_MoveToNextRowForI420(YUVBuferIter& iter) {
+  iter.src_row_y += iter.src_stride_y;
+  if (iter.y_index & 1) {
+    iter.src_row_u += iter.src_stride_u;
+    iter.src_row_v += iter.src_stride_v;
+  }
+  iter.y_index++;
+}
+
+static __inline void YUVBuferIter_ConvertToARGBRow(YUVBuferIter& iter, uint8_t* argb_row) {
+  iter.YUVToARGBRow(iter.src_row_y, iter.src_row_u, iter.src_row_v, argb_row, iter.yuvconstants, iter.src_width);
+}
+
+void YUVBuferIter_Init(YUVBuferIter& iter, uint32_t src_fourcc, YUVColorSpace yuv_color_space) {
+  iter.src_fourcc = src_fourcc;
+  iter.y_index = 0;
+  iter.src_row_y = iter.src_y;
+  iter.src_row_u = iter.src_u;
+  iter.src_row_v = iter.src_v;
+  switch (yuv_color_space) {
+    case YUVColorSpace::BT2020:
+      iter.yuvconstants = &kYuv2020Constants;
+      break;
+    case YUVColorSpace::BT709:
+      iter.yuvconstants = &kYuvH709Constants;
+      break;
+    default:
+      iter.yuvconstants = &kYuvI601Constants;
+  }
+
+  if (src_fourcc == FOURCC_I444) {
+    YUVBuferIter_InitI444(iter);
+    iter.MoveTo = YUVBuferIter_MoveToForI444;
+    iter.MoveToNextRow = YUVBuferIter_MoveToNextRowForI444;
+  } else if(src_fourcc == FOURCC_I422){
+    YUVBuferIter_InitI422(iter);
+    iter.MoveTo = YUVBuferIter_MoveToForI422;
+    iter.MoveToNextRow = YUVBuferIter_MoveToNextRowForI422;
+  } else {
+    assert(src_fourcc == FOURCC_I420); // Should be FOURCC_I420
+    YUVBuferIter_InitI422(iter);
+    iter.MoveTo = YUVBuferIter_MoveToForI420;
+    iter.MoveToNextRow = YUVBuferIter_MoveToNextRowForI420;
+  }
+}
+
+// ScaleARGB ARGB, 1/2
+// This is an optimized version for scaling down a ARGB to 1/2 of
+// its original size.
+static void ScaleYUVToARGBDown2(int src_width, int src_height,
+                                int dst_width, int dst_height,
+                                int src_stride_y,
+                                int src_stride_u,
+                                int src_stride_v,
+                                int dst_stride_argb,
+                                const uint8_t* src_y,
+                                const uint8_t* src_u,
+                                const uint8_t* src_v,
+                                uint8_t* dst_argb,
+                                int x, int dx, int y, int dy,
+                                enum FilterMode filtering,
+                                uint32_t src_fourcc,
+                                YUVColorSpace yuv_color_space) {
+  int j;
+
+  // Allocate 2 rows of ARGB for source conversion.
+  const int kRowSize = (src_width * 4 + 15) & ~15;
+  align_buffer_64(argb_cnv_row, kRowSize * 2);
+  uint8_t* argb_cnv_rowptr = argb_cnv_row;
+  int argb_cnv_rowstride = kRowSize;
+
+  YUVBuferIter iter;
+  iter.src_width = src_width;
+  iter.src_height = src_height;
+  iter.src_stride_y = src_stride_y;
+  iter.src_stride_u = src_stride_u;
+  iter.src_stride_v = src_stride_v;
+  iter.src_y = src_y;
+  iter.src_u = src_u;
+  iter.src_v = src_v;
+  YUVBuferIter_Init(iter, src_fourcc, yuv_color_space);
+
+  void (*ScaleARGBRowDown2)(const uint8_t* src_argb, ptrdiff_t src_stride,
+                            uint8_t* dst_argb, int dst_width) =
+    filtering == kFilterNone ? ScaleARGBRowDown2_C :
+        (filtering == kFilterLinear ? ScaleARGBRowDown2Linear_C :
+        ScaleARGBRowDown2Box_C);
+  assert(dx == 65536 * 2);  // Test scale factor of 2.
+  assert((dy & 0x1ffff) == 0);  // Test vertical scale is multiple of 2.
+  // Advance to odd row, even column.
+  int yi = y >> 16;
+  iter.MoveTo(iter, yi);
+  ptrdiff_t x_offset;
+  if (filtering == kFilterBilinear) {
+    x_offset = (x >> 16) * 4;
+  } else {
+    x_offset = ((x >> 16) - 1) * 4;
+  }
+#if defined(HAS_SCALEARGBROWDOWN2_SSE2)
+  if (TestCpuFlag(kCpuHasSSE2)) {
+    ScaleARGBRowDown2 = filtering == kFilterNone ? ScaleARGBRowDown2_Any_SSE2 :
+        (filtering == kFilterLinear ? ScaleARGBRowDown2Linear_Any_SSE2 :
+        ScaleARGBRowDown2Box_Any_SSE2);
+    if (IS_ALIGNED(dst_width, 4)) {
+      ScaleARGBRowDown2 = filtering == kFilterNone ? ScaleARGBRowDown2_SSE2 :
+          (filtering == kFilterLinear ? ScaleARGBRowDown2Linear_SSE2 :
+          ScaleARGBRowDown2Box_SSE2);
+    }
+  }
+
+#endif
+#if defined(HAS_SCALEARGBROWDOWN2_NEON)
+  if (TestCpuFlag(kCpuHasNEON)) {
+    ScaleARGBRowDown2 = filtering == kFilterNone ? ScaleARGBRowDown2_Any_NEON :
+        (filtering == kFilterLinear ? ScaleARGBRowDown2Linear_Any_NEON :
+        ScaleARGBRowDown2Box_Any_NEON);
+    if (IS_ALIGNED(dst_width, 8)) {
+      ScaleARGBRowDown2 = filtering == kFilterNone ? ScaleARGBRowDown2_NEON :
+          (filtering == kFilterLinear ? ScaleARGBRowDown2Linear_NEON :
+          ScaleARGBRowDown2Box_NEON);
+    }
+  }
+#endif
+
+  const int dyi = dy >> 16;
+  int lastyi = yi;
+  YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_rowptr);
+  // Prepare next row if necessary
+  if (filtering != kFilterLinear) {
+    if ((yi + dyi) < (src_height - 1)) {
+      iter.MoveTo(iter, yi + dyi);
+      YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_rowptr + argb_cnv_rowstride);
+    } else {
+      argb_cnv_rowstride = 0;
+    }
+  }
+
+  if (filtering == kFilterLinear) {
+    argb_cnv_rowstride = 0;
+  }
+  const int max_yi = src_height - 1;
+  const int max_yi_minus_dyi = max_yi - dyi;
+  for (j = 0; j < dst_height; ++j) {
+    if (yi != lastyi) {
+      if (yi > max_yi) {
+        yi = max_yi;
+      }
+      if (yi != lastyi) {
+        if (filtering == kFilterLinear) {
+          iter.MoveTo(iter, yi);
+          YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_rowptr);
+          lastyi = yi;
+        } else {
+          // Prepare current row
+          if (yi == iter.y_index) {
+            argb_cnv_rowptr = argb_cnv_rowptr + argb_cnv_rowstride;
+            argb_cnv_rowstride = - argb_cnv_rowstride;
+          } else {
+            iter.MoveTo(iter, yi);
+            argb_cnv_rowptr = argb_cnv_row;
+            argb_cnv_rowstride = kRowSize;
+            YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_rowptr);
+          }
+          // Prepare next row if necessary
+          if (iter.y_index  < max_yi) {
+            int next_yi = yi < max_yi_minus_dyi ? yi + dyi : max_yi;
+            iter.MoveTo(iter, next_yi);
+            YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_rowptr + argb_cnv_rowstride);
+          } else {
+            argb_cnv_rowstride = 0;
+          }
+          lastyi = yi;
+        }
+      }
+    }
+    ScaleARGBRowDown2(argb_cnv_rowptr + x_offset, argb_cnv_rowstride, dst_argb, dst_width);
+    dst_argb += dst_stride_argb;
+    yi += dyi;
+  }
+
+  free_aligned_buffer_64(argb_cnv_row);
+}
+
+// ScaleARGB ARGB Even
+// This is an optimized version for scaling down a ARGB to even
+// multiple of its original size.
+static void ScaleYUVToARGBDownEven(int src_width, int src_height,
+                                   int dst_width, int dst_height,
+                                   int src_stride_y,
+                                   int src_stride_u,
+                                   int src_stride_v,
+                                   int dst_stride_argb,
+                                   const uint8_t* src_y,
+                                   const uint8_t* src_u,
+                                   const uint8_t* src_v,
+                                   uint8_t* dst_argb,
+                                   int x, int dx, int y, int dy,
+                                   enum FilterMode filtering,
+                                   uint32_t src_fourcc,
+                                   YUVColorSpace yuv_color_space) {
+  int j;
+  // Allocate 2 rows of ARGB for source conversion.
+  const int kRowSize = (src_width * 4 + 15) & ~15;
+  align_buffer_64(argb_cnv_row, kRowSize * 2);
+  uint8_t* argb_cnv_rowptr = argb_cnv_row;
+  int argb_cnv_rowstride = kRowSize;
+
+  int col_step = dx >> 16;
+  void (*ScaleARGBRowDownEven)(const uint8_t* src_argb, ptrdiff_t src_stride,
+                               int src_step, uint8_t* dst_argb, int dst_width) =
+      filtering ? ScaleARGBRowDownEvenBox_C : ScaleARGBRowDownEven_C;
+  assert(IS_ALIGNED(src_width, 2));
+  assert(IS_ALIGNED(src_height, 2));
+  int yi = y >> 16;
+  const ptrdiff_t x_offset = (x >> 16) * 4;
+
+#if defined(HAS_SCALEARGBROWDOWNEVEN_SSE2)
+  if (TestCpuFlag(kCpuHasSSE2)) {
+    ScaleARGBRowDownEven = filtering ? ScaleARGBRowDownEvenBox_Any_SSE2 :
+        ScaleARGBRowDownEven_Any_SSE2;
+    if (IS_ALIGNED(dst_width, 4)) {
+      ScaleARGBRowDownEven = filtering ? ScaleARGBRowDownEvenBox_SSE2 :
+          ScaleARGBRowDownEven_SSE2;
+    }
+  }
+#endif
+#if defined(HAS_SCALEARGBROWDOWNEVEN_NEON)
+  if (TestCpuFlag(kCpuHasNEON)) {
+    ScaleARGBRowDownEven = filtering ? ScaleARGBRowDownEvenBox_Any_NEON :
+        ScaleARGBRowDownEven_Any_NEON;
+    if (IS_ALIGNED(dst_width, 4)) {
+      ScaleARGBRowDownEven = filtering ? ScaleARGBRowDownEvenBox_NEON :
+          ScaleARGBRowDownEven_NEON;
+    }
+  }
+#endif
+
+  YUVBuferIter iter;
+  iter.src_width = src_width;
+  iter.src_height = src_height;
+  iter.src_stride_y = src_stride_y;
+  iter.src_stride_u = src_stride_u;
+  iter.src_stride_v = src_stride_v;
+  iter.src_y = src_y;
+  iter.src_u = src_u;
+  iter.src_v = src_v;
+  YUVBuferIter_Init(iter, src_fourcc, yuv_color_space);
+
+  const int dyi = dy >> 16;
+  int lastyi = yi;
+  YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_rowptr);
+  // Prepare next row if necessary
+  if (filtering != kFilterLinear) {
+    if ((yi + dyi) < (src_height - 1)) {
+      iter.MoveTo(iter, yi + dyi);
+      YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_rowptr + argb_cnv_rowstride);
+    } else {
+      argb_cnv_rowstride = 0;
+    }
+  }
+
+  if (filtering == kFilterLinear) {
+    argb_cnv_rowstride = 0;
+  }
+  const int max_yi = src_height - 1;
+  const int max_yi_minus_dyi = max_yi - dyi;
+  for (j = 0; j < dst_height; ++j) {
+    if (yi != lastyi) {
+      if (yi > max_yi) {
+        yi = max_yi;
+      }
+      if (yi != lastyi) {
+        if (filtering == kFilterLinear) {
+          iter.MoveTo(iter, yi);
+          YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_rowptr);
+          lastyi = yi;
+        } else {
+          // Prepare current row
+          if (yi == iter.y_index) {
+            argb_cnv_rowptr = argb_cnv_rowptr + argb_cnv_rowstride;
+            argb_cnv_rowstride = - argb_cnv_rowstride;
+          } else {
+            iter.MoveTo(iter, yi);
+            argb_cnv_rowptr = argb_cnv_row;
+            argb_cnv_rowstride = kRowSize;
+            YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_rowptr);
+          }
+          // Prepare next row if necessary
+          if (iter.y_index  < max_yi) {
+            int next_yi = yi < max_yi_minus_dyi ? yi + dyi : max_yi;
+            iter.MoveTo(iter, next_yi);
+            YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_rowptr + argb_cnv_rowstride);
+          } else {
+            argb_cnv_rowstride = 0;
+          }
+          lastyi = yi;
+        }
+      }
+    }
+    ScaleARGBRowDownEven(argb_cnv_rowptr + x_offset, argb_cnv_rowstride, col_step, dst_argb, dst_width);
+    dst_argb += dst_stride_argb;
+    yi += dyi;
+  }
+  free_aligned_buffer_64(argb_cnv_row);
+}
+
+// Scale YUV to ARGB down with bilinear interpolation.
+static void ScaleYUVToARGBBilinearDown(int src_width, int src_height,
+                                       int dst_width, int dst_height,
+                                       int src_stride_y,
+                                       int src_stride_u,
+                                       int src_stride_v,
+                                       int dst_stride_argb,
+                                       const uint8_t* src_y,
+                                       const uint8_t* src_u,
+                                       const uint8_t* src_v,
+                                       uint8_t* dst_argb,
+                                       int x, int dx, int y, int dy,
+                                       enum FilterMode filtering,
+                                       uint32_t src_fourcc,
+                                       YUVColorSpace yuv_color_space) {
+  int j;
+  void (*InterpolateRow)(uint8_t* dst_argb, const uint8_t* src_argb,
+      ptrdiff_t src_stride, int dst_width, int source_y_fraction) =
+      InterpolateRow_C;
+  void (*ScaleARGBFilterCols)(uint8_t* dst_argb, const uint8_t* src_argb,
+      int dst_width, int x, int dx) =
+      (src_width >= 32768) ? ScaleARGBFilterCols64_C : ScaleARGBFilterCols_C;
+  int64_t xlast = x + (int64_t)(dst_width - 1) * dx;
+  int64_t xl = (dx >= 0) ? x : xlast;
+  int64_t xr = (dx >= 0) ? xlast : x;
+  int clip_src_width;
+  xl = (xl >> 16) & ~3;  // Left edge aligned.
+  xr = (xr >> 16) + 1;  // Right most pixel used.  Bilinear uses 2 pixels.
+  xr = (xr + 1 + 3) & ~3;  // 1 beyond 4 pixel aligned right most pixel.
+  if (xr > src_width) {
+    xr = src_width;
+  }
+  clip_src_width = (int)(xr - xl) * 4;  // Width aligned to 4.
+  const ptrdiff_t xl_offset = xl * 4;
+  x -= (int)(xl << 16);
+
+  // Allocate 2 row of ARGB for source conversion.
+  const int kRowSize = (src_width * 4 + 15) & ~15;
+  align_buffer_64(argb_cnv_row, kRowSize * 2);
+  uint8_t* argb_cnv_rowptr = argb_cnv_row;
+  int argb_cnv_rowstride = kRowSize;
+
+#if defined(HAS_INTERPOLATEROW_SSSE3)
+  if (TestCpuFlag(kCpuHasSSSE3)) {
+    InterpolateRow = InterpolateRow_Any_SSSE3;
+    if (IS_ALIGNED(clip_src_width, 16)) {
+      InterpolateRow = InterpolateRow_SSSE3;
+    }
+  }
+#endif
+#if defined(HAS_INTERPOLATEROW_AVX2)
+  if (TestCpuFlag(kCpuHasAVX2)) {
+    InterpolateRow = InterpolateRow_Any_AVX2;
+    if (IS_ALIGNED(clip_src_width, 32)) {
+      InterpolateRow = InterpolateRow_AVX2;
+    }
+  }
+#endif
+#if defined(HAS_INTERPOLATEROW_NEON)
+  if (TestCpuFlag(kCpuHasNEON)) {
+    InterpolateRow = InterpolateRow_Any_NEON;
+    if (IS_ALIGNED(clip_src_width, 16)) {
+      InterpolateRow = InterpolateRow_NEON;
+    }
+  }
+#endif
+#if defined(HAS_INTERPOLATEROW_DSPR2)
+  if (TestCpuFlag(kCpuHasDSPR2) &&
+      IS_ALIGNED(src_argb, 4) && IS_ALIGNED(argb_cnv_rowstride, 4)) {
+    InterpolateRow = InterpolateRow_Any_DSPR2;
+    if (IS_ALIGNED(clip_src_width, 4)) {
+      InterpolateRow = InterpolateRow_DSPR2;
+    }
+  }
+#endif
+#if defined(HAS_SCALEARGBFILTERCOLS_SSSE3)
+  if (TestCpuFlag(kCpuHasSSSE3) && src_width < 32768) {
+    ScaleARGBFilterCols = ScaleARGBFilterCols_SSSE3;
+  }
+#endif
+#if defined(HAS_SCALEARGBFILTERCOLS_NEON)
+  if (TestCpuFlag(kCpuHasNEON)) {
+    ScaleARGBFilterCols = ScaleARGBFilterCols_Any_NEON;
+    if (IS_ALIGNED(dst_width, 4)) {
+      ScaleARGBFilterCols = ScaleARGBFilterCols_NEON;
+    }
+  }
+#endif
+
+  int yi = y >> 16;
+
+  YUVBuferIter iter;
+  iter.src_width = src_width;
+  iter.src_height = src_height;
+  iter.src_stride_y = src_stride_y;
+  iter.src_stride_u = src_stride_u;
+  iter.src_stride_v = src_stride_v;
+  iter.src_y = src_y;
+  iter.src_u = src_u;
+  iter.src_v = src_v;
+  YUVBuferIter_Init(iter, src_fourcc, yuv_color_space);
+  iter.MoveTo(iter, yi);
+
+  // TODO(fbarchard): Consider not allocating row buffer for kFilterLinear.
+  // Allocate a row of ARGB.
+  align_buffer_64(row, clip_src_width * 4);
+
+  int lastyi = yi;
+  YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_rowptr);
+  // Prepare next row if necessary
+  if (filtering != kFilterLinear) {
+    if ((yi + 1) < src_height) {
+      iter.MoveToNextRow(iter);
+      YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_rowptr + argb_cnv_rowstride);
+    } else {
+      argb_cnv_rowstride = 0;
+    }
+  }
+
+  const int max_y = (src_height - 1) << 16;
+  const int max_yi = src_height - 1;
+  for (j = 0; j < dst_height; ++j) {
+    yi = y >> 16;
+    if (yi != lastyi) {
+      if (y > max_y) {
+        y = max_y;
+        yi = y >> 16;
+      }
+      if (yi != lastyi) {
+        if (filtering == kFilterLinear) {
+          iter.MoveTo(iter, yi);
+          YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_rowptr);
+          lastyi = yi;
+        } else {
+          // Prepare current row
+          if (yi == iter.y_index) {
+            argb_cnv_rowptr = argb_cnv_rowptr + argb_cnv_rowstride;
+            argb_cnv_rowstride = - argb_cnv_rowstride;
+          } else {
+            iter.MoveTo(iter, yi);
+            argb_cnv_rowptr = argb_cnv_row;
+            argb_cnv_rowstride = kRowSize;
+            YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_rowptr);
+          }
+          // Prepare next row if necessary
+          if (iter.y_index < max_yi) {
+            iter.MoveToNextRow(iter);
+            YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_rowptr + argb_cnv_rowstride);
+          } else {
+            argb_cnv_rowstride = 0;
+          }
+          lastyi = yi;
+        }
+      }
+    }
+    if (filtering == kFilterLinear) {
+      ScaleARGBFilterCols(dst_argb, argb_cnv_rowptr + xl_offset, dst_width, x, dx);
+    } else {
+      int yf = (y >> 8) & 255;
+      InterpolateRow(row, argb_cnv_rowptr + xl_offset, argb_cnv_rowstride, clip_src_width, yf);
+      ScaleARGBFilterCols(dst_argb, row, dst_width, x, dx);
+    }
+    dst_argb += dst_stride_argb;
+    y += dy;
+  }
+  free_aligned_buffer_64(row);
+  free_aligned_buffer_64(argb_cnv_row);
+}
+
+// Scale YUV to ARGB up with bilinear interpolation.
+static void ScaleYUVToARGBBilinearUp(int src_width, int src_height,
+                                     int dst_width, int dst_height,
+                                     int src_stride_y,
+                                     int src_stride_u,
+                                     int src_stride_v,
+                                     int dst_stride_argb,
+                                     const uint8_t* src_y,
+                                     const uint8_t* src_u,
+                                     const uint8_t* src_v,
+                                     uint8_t* dst_argb,
+                                     int x, int dx, int y, int dy,
+                                     enum FilterMode filtering,
+                                     uint32_t src_fourcc,
+                                     YUVColorSpace yuv_color_space) {
+  int j;
+  void (*InterpolateRow)(uint8_t* dst_argb, const uint8_t* src_argb,
+      ptrdiff_t src_stride, int dst_width, int source_y_fraction) =
+      InterpolateRow_C;
+  void (*ScaleARGBFilterCols)(uint8_t* dst_argb, const uint8_t* src_argb,
+      int dst_width, int x, int dx) =
+      filtering ? ScaleARGBFilterCols_C : ScaleARGBCols_C;
+  const int max_y = (src_height - 1) << 16;
+
+  // Allocate 1 row of ARGB for source conversion.
+  align_buffer_64(argb_cnv_row, src_width * 4);
+
+#if defined(HAS_INTERPOLATEROW_SSSE3)
+  if (TestCpuFlag(kCpuHasSSSE3)) {
+    InterpolateRow = InterpolateRow_Any_SSSE3;
+    if (IS_ALIGNED(dst_width, 4)) {
+      InterpolateRow = InterpolateRow_SSSE3;
+    }
+  }
+#endif
+#if defined(HAS_INTERPOLATEROW_AVX2)
+  if (TestCpuFlag(kCpuHasAVX2)) {
+    InterpolateRow = InterpolateRow_Any_AVX2;
+    if (IS_ALIGNED(dst_width, 8)) {
+      InterpolateRow = InterpolateRow_AVX2;
+    }
+  }
+#endif
+#if defined(HAS_INTERPOLATEROW_NEON)
+  if (TestCpuFlag(kCpuHasNEON)) {
+    InterpolateRow = InterpolateRow_Any_NEON;
+    if (IS_ALIGNED(dst_width, 4)) {
+      InterpolateRow = InterpolateRow_NEON;
+    }
+  }
+#endif
+#if defined(HAS_INTERPOLATEROW_DSPR2)
+  if (TestCpuFlag(kCpuHasDSPR2) &&
+      IS_ALIGNED(dst_argb, 4) && IS_ALIGNED(dst_stride_argb, 4)) {
+    InterpolateRow = InterpolateRow_DSPR2;
+  }
+#endif
+  if (src_width >= 32768) {
+    ScaleARGBFilterCols = filtering ?
+        ScaleARGBFilterCols64_C : ScaleARGBCols64_C;
+  }
+#if defined(HAS_SCALEARGBFILTERCOLS_SSSE3)
+  if (filtering && TestCpuFlag(kCpuHasSSSE3) && src_width < 32768) {
+    ScaleARGBFilterCols = ScaleARGBFilterCols_SSSE3;
+  }
+#endif
+#if defined(HAS_SCALEARGBFILTERCOLS_NEON)
+  if (filtering && TestCpuFlag(kCpuHasNEON)) {
+    ScaleARGBFilterCols = ScaleARGBFilterCols_Any_NEON;
+    if (IS_ALIGNED(dst_width, 4)) {
+      ScaleARGBFilterCols = ScaleARGBFilterCols_NEON;
+    }
+  }
+#endif
+#if defined(HAS_SCALEARGBCOLS_SSE2)
+  if (!filtering && TestCpuFlag(kCpuHasSSE2) && src_width < 32768) {
+    ScaleARGBFilterCols = ScaleARGBCols_SSE2;
+  }
+#endif
+#if defined(HAS_SCALEARGBCOLS_NEON)
+  if (!filtering && TestCpuFlag(kCpuHasNEON)) {
+    ScaleARGBFilterCols = ScaleARGBCols_Any_NEON;
+    if (IS_ALIGNED(dst_width, 8)) {
+      ScaleARGBFilterCols = ScaleARGBCols_NEON;
+    }
+  }
+#endif
+  if (!filtering && src_width * 2 == dst_width && x < 0x8000) {
+    ScaleARGBFilterCols = ScaleARGBColsUp2_C;
+#if defined(HAS_SCALEARGBCOLSUP2_SSE2)
+    if (TestCpuFlag(kCpuHasSSE2) && IS_ALIGNED(dst_width, 8)) {
+      ScaleARGBFilterCols = ScaleARGBColsUp2_SSE2;
+    }
+#endif
+  }
+
+  if (y > max_y) {
+    y = max_y;
+  }
+
+  int yi = y >> 16;
+
+  YUVBuferIter iter;
+  iter.src_width = src_width;
+  iter.src_height = src_height;
+  iter.src_stride_y = src_stride_y;
+  iter.src_stride_u = src_stride_u;
+  iter.src_stride_v = src_stride_v;
+  iter.src_y = src_y;
+  iter.src_u = src_u;
+  iter.src_v = src_v;
+  YUVBuferIter_Init(iter, src_fourcc, yuv_color_space);
+  iter.MoveTo(iter, yi);
+
+  // Allocate 2 rows of ARGB.
+  const int kRowSize = (dst_width * 4 + 15) & ~15;
+  align_buffer_64(row, kRowSize * 2);
+
+  uint8_t* rowptr = row;
+  int rowstride = kRowSize;
+  int lastyi = yi;
+
+  YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_row);
+  ScaleARGBFilterCols(rowptr, argb_cnv_row, dst_width, x, dx);
+
+  if (filtering == kFilterLinear) {
+    rowstride = 0;
+  }
+  // Prepare next row if necessary
+  if (filtering != kFilterLinear) {
+    if ((yi + 1) < src_height) {
+      iter.MoveToNextRow(iter);
+      YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_row);
+      ScaleARGBFilterCols(rowptr + rowstride, argb_cnv_row, dst_width, x, dx);
+    }else {
+      rowstride = 0;
+    }
+  }
+
+  const int max_yi = src_height - 1;
+  for (j = 0; j < dst_height; ++j) {
+    yi = y >> 16;
+    if (yi != lastyi) {
+      if (y > max_y) {
+        y = max_y;
+        yi = y >> 16;
+      }
+      if (yi != lastyi) {
+        if (filtering == kFilterLinear) {
+            iter.MoveToNextRow(iter);
+            YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_row);
+            ScaleARGBFilterCols(rowptr, argb_cnv_row, dst_width, x, dx);
+        } else {
+          // Prepare next row if necessary
+          if (yi < max_yi) {
+            iter.MoveToNextRow(iter);
+            rowptr += rowstride;
+            rowstride = -rowstride;
+            // TODO(fbarchard): Convert the clipped region of row.
+            YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_row);
+            ScaleARGBFilterCols(rowptr + rowstride, argb_cnv_row, dst_width, x, dx);
+          } else {
+            rowstride = 0;
+          }
+        }
+        lastyi = yi;
+      }
+    }
+    if (filtering == kFilterLinear) {
+      InterpolateRow(dst_argb, rowptr, 0, dst_width * 4, 0);
+    } else {
+      int yf = (y >> 8) & 255;
+      InterpolateRow(dst_argb, rowptr, rowstride, dst_width * 4, yf);
+    }
+    dst_argb += dst_stride_argb;
+    y += dy;
+  }
+  free_aligned_buffer_64(row);
+  free_aligned_buffer_64(argb_cnv_row);
+}
+
+// Scale ARGB 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 ScaleYUVToARGBSimple(int src_width, int src_height,
+                                 int dst_width, int dst_height,
+                                 int src_stride_y,
+                                 int src_stride_u,
+                                 int src_stride_v,
+                                 int dst_stride_argb,
+                                 const uint8_t* src_y,
+                                 const uint8_t* src_u,
+                                 const uint8_t* src_v,
+                                 uint8_t* dst_argb,
+                                 int x, int dx, int y, int dy,
+                                 uint32_t src_fourcc,
+                                 YUVColorSpace yuv_color_space) {
+  int j;
+  void (*ScaleARGBCols)(uint8_t* dst_argb, const uint8_t* src_argb,
+      int dst_width, int x, int dx) =
+      (src_width >= 32768) ? ScaleARGBCols64_C : ScaleARGBCols_C;
+
+  // Allocate 1 row of ARGB for source conversion.
+  align_buffer_64(argb_cnv_row, src_width * 4);
+
+#if defined(HAS_SCALEARGBCOLS_SSE2)
+  if (TestCpuFlag(kCpuHasSSE2) && src_width < 32768) {
+    ScaleARGBCols = ScaleARGBCols_SSE2;
+  }
+#endif
+#if defined(HAS_SCALEARGBCOLS_NEON)
+  if (TestCpuFlag(kCpuHasNEON)) {
+    ScaleARGBCols = ScaleARGBCols_Any_NEON;
+    if (IS_ALIGNED(dst_width, 8)) {
+      ScaleARGBCols = ScaleARGBCols_NEON;
+    }
+  }
+#endif
+  if (src_width * 2 == dst_width && x < 0x8000) {
+    ScaleARGBCols = ScaleARGBColsUp2_C;
+#if defined(HAS_SCALEARGBCOLSUP2_SSE2)
+    if (TestCpuFlag(kCpuHasSSE2) && IS_ALIGNED(dst_width, 8)) {
+      ScaleARGBCols = ScaleARGBColsUp2_SSE2;
+    }
+#endif
+  }
+
+  int yi = y >> 16;
+
+  YUVBuferIter iter;
+  iter.src_width = src_width;
+  iter.src_height = src_height;
+  iter.src_stride_y = src_stride_y;
+  iter.src_stride_u = src_stride_u;
+  iter.src_stride_v = src_stride_v;
+  iter.src_y = src_y;
+  iter.src_u = src_u;
+  iter.src_v = src_v;
+  YUVBuferIter_Init(iter, src_fourcc, yuv_color_space);
+  iter.MoveTo(iter, yi);
+
+  int lasty = yi;
+  YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_row);
+
+  for (j = 0; j < dst_height; ++j) {
+    yi = y >> 16;
+    if (yi != lasty) {
+      iter.MoveTo(iter, yi);
+      YUVBuferIter_ConvertToARGBRow(iter, argb_cnv_row);
+      lasty = yi;
+    }
+    ScaleARGBCols(dst_argb, argb_cnv_row, dst_width, x, dx);
+    dst_argb += dst_stride_argb;
+    y += dy;
+  }
+  free_aligned_buffer_64(argb_cnv_row);
+}
+
+static void YUVToARGBCopy(const uint8_t* src_y, int src_stride_y,
+                          const uint8_t* src_u, int src_stride_u,
+                          const uint8_t* src_v, int src_stride_v,
+                          int src_width, int src_height,
+                          uint8_t* dst_argb, int dst_stride_argb,
+                          int dst_width, int dst_height,
+                          uint32_t src_fourcc,
+                          YUVColorSpace yuv_color_space)
+{
+  YUVBuferIter iter;
+  iter.src_width = src_width;
+  iter.src_height = src_height;
+  iter.src_stride_y = src_stride_y;
+  iter.src_stride_u = src_stride_u;
+  iter.src_stride_v = src_stride_v;
+  iter.src_y = src_y;
+  iter.src_u = src_u;
+  iter.src_v = src_v;
+  YUVBuferIter_Init(iter, src_fourcc, yuv_color_space);
+
+  for (int j = 0; j < dst_height; ++j) {
+    YUVBuferIter_ConvertToARGBRow(iter, dst_argb);
+    iter.MoveToNextRow(iter);
+    dst_argb += dst_stride_argb;
+  }
+}
+
+static void ScaleYUVToARGB(const uint8_t* src_y, int src_stride_y,
+                           const uint8_t* src_u, int src_stride_u,
+                           const uint8_t* src_v, int src_stride_v,
+                           int src_width, int src_height,
+                           uint8_t* dst_argb, int dst_stride_argb,
+                           int dst_width, int dst_height,
+                           enum FilterMode filtering,
+                           uint32_t src_fourcc,
+                           YUVColorSpace yuv_color_space)
+{
+  // Initial source x/y coordinate and step values as 16.16 fixed point.
+  int x = 0;
+  int y = 0;
+  int dx = 0;
+  int dy = 0;
+  // ARGB does not support box filter yet, but allow the user to pass it.
+  // Simplify filtering when possible.
+  filtering = ScaleFilterReduce(src_width, src_height,
+                                dst_width, dst_height,
+                                filtering);
+  ScaleSlope(src_width, src_height, dst_width, dst_height, filtering,
+             &x, &y, &dx, &dy);
+
+  // Special case for integer step values.
+  if (((dx | dy) & 0xffff) == 0) {
+    if (!dx || !dy) {  // 1 pixel wide and/or tall.
+      filtering = kFilterNone;
+    } else {
+      // Optimized even scale down. ie 2, 4, 6, 8, 10x.
+      if (!(dx & 0x10000) && !(dy & 0x10000)) {
+        if (dx == 0x20000) {
+          // Optimized 1/2 downsample.
+          ScaleYUVToARGBDown2(src_width, src_height,
+                              dst_width, dst_height,
+                              src_stride_y,
+                              src_stride_u,
+                              src_stride_v,
+                              dst_stride_argb,
+                              src_y,
+                              src_u,
+                              src_v,
+                              dst_argb,
+                              x, dx, y, dy,
+                              filtering,
+                              src_fourcc,
+                              yuv_color_space);
+          return;
+        }
+        ScaleYUVToARGBDownEven(src_width, src_height,
+                               dst_width, dst_height,
+                               src_stride_y,
+                               src_stride_u,
+                               src_stride_v,
+                               dst_stride_argb,
+                               src_y,
+                               src_u,
+                               src_v,
+                               dst_argb,
+                               x, dx, y, dy,
+                               filtering,
+                               src_fourcc,
+                               yuv_color_space);
+        return;
+      }
+      // Optimized odd scale down. ie 3, 5, 7, 9x.
+      if ((dx & 0x10000) && (dy & 0x10000)) {
+        filtering = kFilterNone;
+        if (dx == 0x10000 && dy == 0x10000) {
+          // Straight conversion and copy.
+          YUVToARGBCopy(src_y, src_stride_y,
+                        src_u, src_stride_u,
+                        src_v, src_stride_v,
+                        src_width, src_height,
+                        dst_argb, dst_stride_argb,
+                        dst_width, dst_height,
+                        src_fourcc,
+                        yuv_color_space);
+          return;
+        }
+      }
+    }
+  }
+  if (filtering && dy < 65536) {
+    ScaleYUVToARGBBilinearUp(src_width, src_height,
+                             dst_width, dst_height,
+                             src_stride_y,
+                             src_stride_u,
+                             src_stride_v,
+                             dst_stride_argb,
+                             src_y,
+                             src_u,
+                             src_v,
+                             dst_argb,
+                             x, dx, y, dy,
+                             filtering,
+                             src_fourcc,
+                             yuv_color_space);
+    return;
+  }
+  if (filtering) {
+    ScaleYUVToARGBBilinearDown(src_width, src_height,
+                               dst_width, dst_height,
+                               src_stride_y,
+                               src_stride_u,
+                               src_stride_v,
+                               dst_stride_argb,
+                               src_y,
+                               src_u,
+                               src_v,
+                               dst_argb,
+                               x, dx, y, dy,
+                               filtering,
+                               src_fourcc,
+                               yuv_color_space);
+    return;
+  }
+  ScaleYUVToARGBSimple(src_width, src_height,
+                       dst_width, dst_height,
+                       src_stride_y,
+                       src_stride_u,
+                       src_stride_v,
+                       dst_stride_argb,
+                       src_y,
+                       src_u,
+                       src_v,
+                       dst_argb,
+                       x, dx, y, dy,
+                       src_fourcc,
+                       yuv_color_space);
+}
+
+bool IsConvertSupported(uint32_t src_fourcc)
+{
+  if (src_fourcc == FOURCC_I444 ||
+      src_fourcc == FOURCC_I422 ||
+      src_fourcc == FOURCC_I420) {
+    return true;
+  }
+  return false;
+}
+
+LIBYUV_API
+int YUVToARGBScale(const uint8_t* src_y, int src_stride_y,
+                   const uint8_t* src_u, int src_stride_u,
+                   const uint8_t* src_v, int src_stride_v,
+                   uint32_t src_fourcc,
+                   YUVColorSpace yuv_color_space,
+                   int src_width, int src_height,
+                   uint8_t* dst_argb, int dst_stride_argb,
+                   int dst_width, int dst_height,
+                   enum FilterMode filtering)
+{
+  if (!src_y || !src_u || !src_v ||
+      src_width == 0 || src_height == 0 ||
+      !dst_argb || dst_width <= 0 || dst_height <= 0) {
+    return -1;
+  }
+  if (!IsConvertSupported(src_fourcc)) {
+    return -1;
+  }
+  ScaleYUVToARGB(src_y, src_stride_y,
+                 src_u, src_stride_u,
+                 src_v, src_stride_v,
+                 src_width, src_height,
+                 dst_argb, dst_stride_argb,
+                 dst_width, dst_height,
+                 filtering,
+                 src_fourcc,
+                 yuv_color_space);
+  return 0;
+}
+
+#ifdef __cplusplus
+}  // extern "C"
+}  // namespace libyuv
+#endif