Implements RGB to YV12 conversion in YASM.

media/base/simd/convert_rgb_to_yuv_ssse3.asm

+; Copyright (c) 2011 The Chromium Authors. All rights reserved.
+; Use of this source code is governed by a BSD-style license that can be
+; found in the LICENSE file.
+
+%include "x86inc.asm"
+
+;
+; A table used in this file.
+;   static const int8 kSIMD_ConvertARGBtoYUV_kTable[16 + 4] = {
+;     25, 2, 66, 0, 0, 127, 0, 0, 112, -74, -38, 0, -18, -94, 112, 0,
+;     128, 0, 128, 0,
+;   };
+;
+  SECTION_RODATA
+
+SIMD_ConvertARGBtoYUV_kTable:
+  db        25, 2, 66, 0

[Alpha Left Google, 2011/09/01 13:24:45]

Please add comments here for what these constants represents, for example which
row is coefficients for Y, U or V.

+  db        0, 127, 0, 0
+  db        112, -74, -38, 0
+  db        -18, -94, 112, 0
+  dw        128, 128
+

[Alpha Left Google, 2011/09/01 13:24:45]

It looks like this is the UV offset, please add comments here.

+;
+; This file uses SSE, SSE2, SSE3, and SSSE3, which are supported by all ATOM
+; processors.
+;
+  SECTION_TEXT
+  CPU       SSE, SSE3, SSE3, SSSE3
+
+;
+; XMM registers representing constants. We must not use these registers as
+; destination operands.
+; for (int i = 0; i < 16; i += 4) {
+;   xmm7.b[i] = 25;  xmm7.b[i+1] = 2;   xmm7.b[i+2] = 66;  xmm7.b[i+3] = 0;
+;   xmm6.b[i] = 0;   xmm6.b[i+1] = 127; xmm6.b[i+2] = 0;   xmm6.b[i+3] = 0;
+;   xmm5.b[i] = 112; xmm5.b[i+1] = -74; xmm5.b[i+2] = -38; xmm5.b[i+3] = 0;
+;   xmm4.b[i] = -18; xmm4.b[i+1] = -94; xmm4.b[i+2] = 112; xmm4.b[i+3] = 0;
+; }
+;
+%define XMM_CONST_Y0    xmm7
+%define XMM_CONST_Y1    xmm6
+%define XMM_CONST_U     xmm5
+%define XMM_CONST_V     xmm4
+%define XMM_CONST_128   xmm3
+
+;
+; LOAD_XMM %1 (xmm), %2 (imm32)
+; Loads an immediate value to an XMM register.
+;   %1.d[0] = %1.d[1] =  %1.d[2] =  %1.d[3] = %2;
+;
+%macro LOAD_XMM 2
+  mov       TEMPd, %2
+  movd      %1, TEMPd
+  pshufd    %1, %1, 00000000B
+%endmacro
+
+;
+; UNPACKRGB %1 (xmm), %2 (imm8)
+; Unpacks one RGB pixel in the specified XMM register.
+;   for (int i = 15; i > %2; --i) %1.b[i] = %1.b[i - 1];
+;   %1.b[%2] = 0;
+;   for (int i = %2 - 1; i >= 0; --i) %1.b[i] = %1.b[i];
+;
+%macro UNPACKRGB 2
+  movdqa    xmm1, %1
+  psrldq    xmm1, %2
+  pslldq    xmm1, %2
+  pxor      %1, xmm1
+  pslldq    xmm1, 1
+  por       %1, xmm1
+%endmacro
+
+;
+; READ_ARGB %1 (xmm), %2 (imm)
+; Read the specified number of ARGB (or RGB) pixels from the source and store
+; them to the destination xmm register. If the input format is RGB, we read RGB
+; pixels and convert them to ARGB pixels. (For this case, the alpha values of
+; the output pixels become 0.)
+;
+%macro READ_ARGB 2
+
+%if PIXELSIZE == 4
+
+  ; Read ARGB pixels from the source. (This macro assumes the input buffer may
+  ; not be aligned to a 16-byte boundary.)
+%if %2 == 1
+  movd      %1, DWORD [ARGBq + WIDTHq * 4 * 2]
+%elif %2 == 2
+  movq      %1, QWORD [ARGBq + WIDTHq * 4 * 2]
+%elif %2 == 4
+  movdqu    %1, DQWORD [ARGBq + WIDTHq * 4 * 2]
+%else
+%error unsupported number of pixels.
+%endif
+
+%elif PIXELSIZE == 3
+
+  ; Read RGB pixels from the source and convert them to ARGB pixels.
+%if %2 == 1
+  ; Read one RGB pixel and convert it to one ARGB pixel.
+  ; Save the WIDTH register to xmm1. (This macro needs to break it.)
+  MOVq      xmm1, WIDTHq
+
+  ; Once read three bytes from the source to TEMPd, and copy it to the
+  ; destination xmm register.
+  lea       WIDTHq, [WIDTHq + WIDTHq * 2]
+  movzx     TEMPd, BYTE [ARGBq + WIDTHq * 2 + 2]
+  shl       TEMPd, 16
+  mov       TEMPw, WORD [ARGBq + WIDTHq * 2]
+  movd      %1, TEMPd
+
+  ; Restore the WIDTH register.
+  MOVq      WIDTHq, xmm1
+%elif %2 == 2
+  ; Read two RGB pixels and convert them to two ARGB pixels.
+  ; Read six bytes from the source to the destination xmm register.
+  mov       TEMPq, WIDTHq
+  lea       TEMPq, [TEMPq + TEMPq * 2]
+  movd      %1, DWORD [ARGBq + TEMPq * 2]
+  pinsrw    %1, WORD [ARGBq + TEMPq * 2 + 4], 3
+
+  ; Fill the alpha values of these RGB pixels with 0 and convert them to two
+  ; ARGB pixels.
+  UNPACKRGB %1, 3
+%elif %2 == 4
+  ; Read four RGB pixels and convert them to four ARGB pixels.
+  ; Read twelve bytes from the source to the destination xmm register.
+  mov       TEMPq, WIDTHq
+  lea       TEMPq, [TEMPq + TEMPq * 2]
+  movq      %1, QWORD [ARGBq + TEMPq * 2]
+  movd      xmm1, DWORD [ARGBq + TEMPq * 2 + 8]
+  shufps    %1, xmm1, 01000100B
+
+  ; Fill the alpha values of these RGB pixels with 0 and convert them to four
+  ; ARGB pixels.
+  UNPACKRGB %1, 3
+  UNPACKRGB %1, 4 + 3
+  UNPACKRGB %1, 4 + 4 + 3
+%else
+%error unsupported number of pixels.
+%endif
+
+%else
+%error unsupported PIXELSIZE value.
+%endif
+
+%endmacro
+
+;
+; CALC_Y %1 (xmm), %2 (xmm)
+; Calculates four Y values from four ARGB pixels stored in %2.
+;   %1.b[0] = ToByte((25 * B(0) + 129 * G(0) + 66 * R(0) + 128) / 256 + 16);
+;   %1.b[1] = ToByte((25 * B(1) + 129 * G(1) + 66 * R(1) + 128) / 256 + 16);
+;   %1.b[2] = ToByte((25 * B(2) + 129 * G(2) + 66 * R(2) + 128) / 256 + 16);
+;   %1.b[3] = ToByte((25 * B(3) + 129 * G(3) + 66 * R(3) + 128) / 256 + 16);
+;
+%macro CALC_Y 2
+  ; To avoid signed saturation, we divide this conversion formula into two
+  ; formulae and store their results into two XMM registers %1 and xmm2.
+  ; %1.w[0]   = 25  * %2.b[0]  + 2   * %2.b[1]  + 66  * %2.b[2]  + 0 * %2.b[3];
+  ; %1.w[1]   = 25  * %2.b[4]  + 2   * %2.b[5]  + 66  * %2.b[6]  + 0 * %2.b[7];
+  ; %1.w[2]   = 25  * %2.b[8]  + 2   * %2.b[9]  + 66  * %2.b[10] + 0 * %2.b[11];
+  ; %1.w[3]   = 25  * %2.b[12] + 2   * %2.b[13] + 66  * %2.b[14] + 0 * %2.b[15];
+  ; xmm2.w[0] = 0   * %2.b[0]  + 127 * %2.b[1]  + 0   * %2.b[2]  + 0 * %2.b[3];
+  ; xmm2.w[1] = 0   * %2.b[4]  + 127 * %2.b[5]  + 0   * %2.b[6]  + 0 * %2.b[7];
+  ; xmm2.w[2] = 0   * %2.b[8]  + 127 * %2.b[9]  + 0   * %2.b[10] + 0 * %2.b[11];
+  ; xmm2.w[3] = 0   * %2.b[12] + 127 * %2.b[13] + 0   * %2.b[14] + 0 * %2.b[15];
+  movdqa    %1, %2
+  pmaddubsw %1, XMM_CONST_Y0
+  phaddsw   %1, %1
+  movdqa    xmm2, %2
+  pmaddubsw xmm2, XMM_CONST_Y1
+  phaddsw   xmm2, xmm2
+
+  ; %1.b[0] = ToByte((%1.w[0] + xmm2.w[0] + 128) / 256 + 16);
+  ; %1.b[1] = ToByte((%1.w[1] + xmm2.w[1] + 128) / 256 + 16);
+  ; %1.b[2] = ToByte((%1.w[2] + xmm2.w[2] + 128) / 256 + 16);
+  ; %1.b[3] = ToByte((%1.w[3] + xmm2.w[3] + 128) / 256 + 16);
+  paddw     %1, xmm2
+  movdqa    xmm2, XMM_CONST_128
+  paddw     %1, xmm2
+  psrlw     %1, 8
+  psrlw     xmm2, 3
+  paddw     %1, xmm2
+  packuswb  %1, %1
+%endmacro
+
+;
+; INIT_UV %1 (r32), %2 (reg) %3 (imm)
+;
+%macro INIT_UV 3
+
+%if SUBSAMPLING == 1 && LINE == 1
+%if %3 == 1 || %3 == 2
+  movzx     %1, BYTE [%2 + WIDTHq]
+%elif %3 == 4
+  movzx     %1, WORD [%2 + WIDTHq]
+%else
+%error unsupported number of pixels.
+%endif
+%endif
+
+%endmacro
+
+;
+; CALC_UV %1 (xmm), %2 (xmm), %3 (xmm), %4 (r32)
+; Calculates two U (or V) values from four ARGB pixels stored in %2.
+; if %3 == XMM_CONST_U
+; if (SUBSAMPLING) {
+;   %1.b[0] = ToByte((112 * B(0) - 74 * G(0) - 38 * R(0) + 128) / 256 + 128);
+;   %1.b[0] = ToByte((112 * B(0) - 74 * G(0) - 38 * R(0) + 128) / 256 + 128);
+;   %1.b[1] = ToByte((112 * B(2) - 74 * G(2) - 38 * R(2) + 128) / 256 + 128);
+;   %1.b[1] = ToByte((112 * B(2) - 74 * G(2) - 38 * R(2) + 128) / 256 + 128);
+; } else {
+;   %1.b[0] = ToByte((112 * B(0) - 74 * G(0) - 38 * R(0) + 128) / 256 + 128);
+;   %1.b[1] = ToByte((112 * B(2) - 74 * G(2) - 38 * R(2) + 128) / 256 + 128);
+; }
+; if %3 == XMM_CONST_V
+;   %1.b[0] = ToByte((-18 * B(0) - 94 * G(0) + 112 * R(0) + 128) / 256 + 128);
+;   %1.b[1] = ToByte((-18 * B(2) - 94 * G(2) + 112 * R(2) + 128) / 256 + 128);
+;
+%macro CALC_UV 4
+  ; for (int i = 0; i < 4; ++i) {
+  ;   %1.w[i] = 0;
+  ;   for (int j = 0; j < 4; ++j)
+  ;     %1.w[i] += %3.b[i * 4 + j] + %2.b[i * 4 + j];
+  ; }
+  movdqa    %1, %2
+  pmaddubsw %1, %3
+  phaddsw   %1, %1
+
+%if SUBSAMPLING == 1
+  ; %1.w[0] = (%1.w[0] + %1.w[1] + 1) / 2;
+  ; %1.w[1] = (%1.w[1] + %1.w[0] + 1) / 2;
+  ; %1.w[2] = (%1.w[2] + %1.w[3] + 1) / 2;
+  ; %1.w[3] = (%1.w[3] + %1.w[2] + 1) / 2;
+  pshuflw   xmm2, %1, 10110001B
+  pavgw     %1, xmm2
+%endif
+
+  ; %1.b[0] = ToByte((%1.w[0] + 128) / 256 + 128);
+  ; %1.b[1] = ToByte((%1.w[2] + 128) / 256 + 128);
+  pshuflw   %1, %1, 10001000B
+  paddw     %1, XMM_CONST_128
+  psraw     %1, 8
+  paddw     %1, XMM_CONST_128
+  packuswb  %1, %1
+
+%if SUBSAMPLING == 1 && LINE == 1
+  ; %1.b[0] = (%1.b[0] + %3.b[0] + 1) / 2;
+  ; %1.b[1] = (%1.b[1] + %3.b[1] + 1) / 2;
+  movd      xmm2, %4
+  pavgb     %1, xmm2
+%endif
+%endmacro
+
+;
+; void media::simd::ConvertARGBtoYUVRow(const uint8* argb,
+;                                       uint8* y,
+;                                       uint8* u,
+;                                       uint8* v,
+;                                       int width);
+;
+%ifdef MACHO
+%define SYMBOL          __ZN5media4simd19ConvertARGBtoYUVRowEPKhPhS3_S3_i
+%elifdef ELF
+%define SYMBOL          _ZN5media4simd19ConvertARGBtoYUVRowEPKhPhS3_S3_i
+%elifdef MSVC
+%define SYMBOL          ?ConvertARGBtoYUVRow@simd@media@@YAXPBEPAE11H@Z
+%endif
+%define PIXELSIZE       4
+%define SUBSAMPLING     0
+%define LINE            0
+%include "convert_rgb_to_yuv_ssse3.inc"
+
+;
+; void media::simd::ConvertRGBToYUVRow(const uint8* rgb,
+;                                      uint8* y,
+;                                      uint8* u,
+;                                      uint8* v,
+;                                      int width);
+;
+%ifdef MACHO
+%define SYMBOL          __ZN5media4simd18ConvertRGBtoYUVRowEPKhPhS3_S3_i
+%elifdef ELF
+%define SYMBOL          _ZN5media4simd18ConvertRGBtoYUVRowEPKhPhS3_S3_i
+%elifdef MSVC
+%define SYMBOL          ?ConvertRGBtoYUVRow@simd@media@@YAXPBEPAE11H@Z
+%endif
+%define PIXELSIZE       3
+%define SUBSAMPLING     0
+%define LINE            0
+%include "convert_rgb_to_yuv_ssse3.inc"
+
+;
+; void media::simd::ConvertARGBtoYUVEven(const uint8* argb,
+;                                        uint8* y,
+;                                        uint8* u,
+;                                        uint8* v,
+;                                        int width);
+;
+%ifdef MACHO
+%define SYMBOL          __ZN5media4simd19ConvertARGBtoYUVEvenEPKhPhS3_S3_i
+%elifdef ELF
+%define SYMBOL          _ZN5media4simd19ConvertARGBtoYUVEvenEPKhPhS3_S3_i
+%elifdef MSVC
+%define SYMBOL          ?ConvertARGBtoYUVEven@simd@media@@YAXPBEPAE11H@Z
+%endif
+%define PIXELSIZE       4
+%define SUBSAMPLING     1
+%define LINE            0
+%include "convert_rgb_to_yuv_ssse3.inc"
+
+;
+; void media::simd::ConvertARGBtoYUVOdd(const uint8* argb,
+;                                       uint8* y,
+;                                       uint8* u,
+;                                       uint8* v,
+;                                       int width);
+;
+%ifdef MACHO
+%define SYMBOL          __ZN5media4simd19ConvertARGBtoYUVOddEPKhPhS3_S3_i
+%elifdef ELF
+%define SYMBOL          _ZN5media4simd19ConvertARGBtoYUVOddEPKhPhS3_S3_i
+%elifdef MSVC
+%define SYMBOL          ?ConvertARGBtoYUVOdd@simd@media@@YAXPBEPAE11H@Z
+%endif
+%define PIXELSIZE       4
+%define SUBSAMPLING     1
+%define LINE            1
+%include "convert_rgb_to_yuv_ssse3.inc"
+
+;
+; void media::simd::ConvertRGBToYUVEven(const uint8* rgb,
+;                                       uint8* y,
+;                                       uint8* u,
+;                                       uint8* v,
+;                                       int width);
+;
+%ifdef MACHO
+%define SYMBOL          __ZN5media4simd18ConvertRGBtoYUVEvenEPKhPhS3_S3_i
+%elifdef ELF
+%define SYMBOL          _ZN5media4simd18ConvertRGBtoYUVEvenEPKhPhS3_S3_i
+%elifdef MSVC
+%define SYMBOL          ?ConvertRGBtoYUVEven@simd@media@@YAXPBEPAE11H@Z
+%endif
+%define PIXELSIZE       3
+%define SUBSAMPLING     1
+%define LINE            0
+%include "convert_rgb_to_yuv_ssse3.inc"
+
+;
+; void media::simd::ConvertRGBToYUVOdd(const uint8* rgb,
+;                                      uint8* y,
+;                                      uint8* u,
+;                                      uint8* v,
+;                                      int width);
+;
+%ifdef MACHO
+%define SYMBOL          __ZN5media4simd18ConvertRGBtoYUVOddEPKhPhS3_S3_i
+%elifdef ELF
+%define SYMBOL          _ZN5media4simd18ConvertRGBtoYUVOddEPKhPhS3_S3_i
+%elifdef MSVC
+%define SYMBOL          ?ConvertRGBtoYUVOdd@simd@media@@YAXPBEPAE11H@Z
+%endif
+%define PIXELSIZE       3
+%define SUBSAMPLING     1
+%define LINE            1
+%include "convert_rgb_to_yuv_ssse3.inc"