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; 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 "third_party/x86inc/x86inc.asm"
;
; This file uses MMX, SSE2 and instructions.
;
SECTION_TEXT
CPU SSE2
; void ScaleYUVToRGB32Row_SSE2_X64(const uint8* y_buf,
; const uint8* u_buf,
; const uint8* v_buf,
; uint8* rgb_buf,
; ptrdiff_t width,
; ptrdiff_t source_dx);
%define SYMBOL ScaleYUVToRGB32Row_SSE2_X64
global mangle(SYMBOL) PRIVATE
align function_align
mangle(SYMBOL):
%assign stack_offset 0
extern mangle(kCoefficientsRgbY)
; Parameters are in the following order:
; 1. Y plane
; 2. U plane
; 3. V plane
; 4. ARGB frame
; 5. Width
; 6. Source dx
PROLOGUE 6, 7, 3, Y, U, V, ARGB, WIDTH, SOURCE_DX, COMP
%define TABLEq r10
%define Xq r11
%define INDEXq r12
PUSH r10
PUSH r11
PUSH r12
LOAD_SYM TABLEq, mangle(kCoefficientsRgbY)
; Set Xq index to 0.
xor Xq, Xq
jmp .scaleend
.scaleloop:
; Read UV pixels.
mov INDEXq, Xq
sar INDEXq, 17
movzx COMPd, BYTE [Uq + INDEXq]
movq xmm0, [TABLEq + 2048 + 8 * COMPq]
movzx COMPd, BYTE [Vq + INDEXq]
movq xmm1, [TABLEq + 4096 + 8 * COMPq]
; Read first Y pixel.
lea INDEXq, [Xq + SOURCE_DXq] ; INDEXq nows points to next pixel.
sar Xq, 16
movzx COMPd, BYTE [Yq + Xq]
paddsw xmm0, xmm1 ; Hide a ADD after memory load.
movq xmm1, [TABLEq + 8 * COMPq]
; Read next Y pixel.
lea Xq, [INDEXq + SOURCE_DXq] ; Xq now points to next pixel.
sar INDEXq, 16
movzx COMPd, BYTE [Yq + INDEXq]
movq xmm2, [TABLEq + 8 * COMPq]
paddsw xmm1, xmm0
paddsw xmm2, xmm0
shufps xmm1, xmm2, 0x44 ; Join two pixels into one XMM register
psraw xmm1, 6
packuswb xmm1, xmm1
movq QWORD [ARGBq], xmm1
add ARGBq, 8
.scaleend:
sub WIDTHq, 2
jns .scaleloop
and WIDTHq, 1 ; odd number of pixels?
jz .scaledone
; Read U V components.
mov INDEXq, Xq
sar INDEXq, 17
movzx COMPd, BYTE [Uq + INDEXq]
movq xmm0, [TABLEq + 2048 + 8 * COMPq]
movzx COMPd, BYTE [Vq + INDEXq]
movq xmm1, [TABLEq + 4096 + 8 * COMPq]
paddsw xmm0, xmm1
; Read one Y component.
mov INDEXq, Xq
sar INDEXq, 16
movzx COMPd, BYTE [Yq + INDEXq]
movq xmm1, [TABLEq + 8 * COMPq]
paddsw xmm1, xmm0
psraw xmm1, 6
packuswb xmm1, xmm1
movd DWORD [ARGBq], xmm1
.scaledone:
POP r12
POP r11
POP r10
RET
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