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| 1 ; Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
| 2 ; Use of this source code is governed by a BSD-style license that can be | |
| 3 ; found in the LICENSE file. | |
| 4 | |
| 5 %include "media/base/simd/media_export.asm" | |
| 6 | |
| 7 EXPORT SYMBOL | |
| 8 align function_align | |
| 9 | |
| 10 mangle(SYMBOL): | |
| 11 %assign stack_offset 0 | |
| 12 PROLOGUE 7, 7, 3, Y, U, V, A, ARGB, WIDTH, TABLE | |
| 13 PUSH WIDTHq | |
| 14 DEFINE_ARGS Y, U, V, A, ARGB, TABLE, TEMP | |
| 15 mov TABLEq, TEMPq | |
| 16 jmp .convertend | |
| 17 | |
| 18 .convertloop: | |
| 19 movzx TEMPd, BYTE [Uq] | |
| 20 movq mm0, [TABLEq + 2048 + 8 * TEMPq] | |
| 21 add Uq, 1 | |
| 22 | |
| 23 movzx TEMPd, BYTE [Vq] | |
| 24 paddsw mm0, [TABLEq + 4096 + 8 * TEMPq] | |
| 25 add Vq, 1 | |
| 26 | |
| 27 movzx TEMPd, BYTE [Yq] | |
| 28 movq mm1, [TABLEq + 8 * TEMPq] | |
| 29 | |
| 30 movzx TEMPd, BYTE [Yq + 1] | |
| 31 movq mm2, [TABLEq + 8 * TEMPq] | |
| 32 add Yq, 2 | |
| 33 | |
| 34 ; Add UV components to Y component. | |
| 35 paddsw mm1, mm0 | |
| 36 paddsw mm2, mm0 | |
| 37 | |
| 38 ; Down shift and then pack. | |
| 39 psraw mm1, 6 | |
| 40 psraw mm2, 6 | |
| 41 packuswb mm1, mm2 | |
| 42 | |
| 43 ; Unpack | |
| 44 movq mm0, mm1 | |
| 45 pxor mm2, mm2 | |
| 46 punpcklbw mm0, mm2 | |
| 47 punpckhbw mm1, mm2 | |
| 48 | |
| 49 ; Add one to our alpha values, this is a somewhat unfortunate hack; while | |
| 50 ; the pack/unpack above handle saturating any negative numbers to 0, they also | |
| 51 ; truncate the alpha value to 255. The math ahead wants to produce the same | |
| 52 ; ARGB alpha value as the source pixel in YUVA, but this depends on the alpha | |
| 53 ; value in |mm0| and |mm1| being 256, (let A be the source image alpha, | |
| 54 ; 256 * A >> 8 == A, whereas 255 * A >> 8 is off by one except at 0). | |
| 55 mov TEMPq, 0x00010000 | |
| 56 movd mm2, TEMPd | |
| 57 psllq mm2, 32 | |
| 58 paddsw mm0, mm2 | |
| 59 paddsw mm1, mm2 | |
| 60 | |
| 61 ; Multiply by alpha value, then repack high bytes of words. | |
| 62 movzx TEMPd, BYTE [Aq] | |
| 63 movq mm2, [TABLEq + 6144 + 8 * TEMPq] | |
| 64 pmullw mm0, mm2 | |
| 65 psrlw mm0, 8 | |
| 66 movzx TEMPd, BYTE [Aq + 1] | |
| 67 movq mm2, [TABLEq + 6144 + 8 * TEMPq] | |
| 68 add Aq, 2 | |
| 69 pmullw mm1, mm2 | |
| 70 psrlw mm1, 8 | |
| 71 packuswb mm0, mm1 | |
| 72 | |
| 73 MOVQ [ARGBq], mm0 | |
| 74 add ARGBq, 8 | |
| 75 | |
| 76 .convertend: | |
| 77 sub dword [rsp], 2 | |
| 78 jns .convertloop | |
| 79 | |
| 80 ; If number of pixels is odd then compute it. | |
| 81 and dword [rsp], 1 | |
| 82 jz .convertdone | |
| 83 | |
| 84 movzx TEMPd, BYTE [Uq] | |
| 85 movq mm0, [TABLEq + 2048 + 8 * TEMPq] | |
| 86 movzx TEMPd, BYTE [Vq] | |
| 87 paddsw mm0, [TABLEq + 4096 + 8 * TEMPq] | |
| 88 movzx TEMPd, BYTE [Yq] | |
| 89 movq mm1, [TABLEq + 8 * TEMPq] | |
| 90 paddsw mm1, mm0 | |
| 91 psraw mm1, 6 | |
| 92 packuswb mm1, mm1 | |
| 93 | |
| 94 ; Multiply ARGB by alpha value. | |
| 95 pxor mm0, mm0 | |
| 96 punpcklbw mm1, mm0 | |
| 97 | |
| 98 ; See above note about this hack. | |
| 99 mov TEMPq, 0x00010000 | |
| 100 movd mm0, TEMPd | |
| 101 psllq mm0, 32 | |
| 102 paddsw mm1, mm0 | |
| 103 | |
| 104 movzx TEMPd, BYTE [Aq] | |
| 105 movq mm0, [TABLEq + 6144 + 8 * TEMPq] | |
| 106 pmullw mm1, mm0 | |
| 107 psrlw mm1, 8 | |
| 108 packuswb mm1, mm1 | |
| 109 | |
| 110 movd [ARGBq], mm1 | |
| 111 | |
| 112 .convertdone: | |
| 113 POP TABLEq | |
| 114 RET | |
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Chromium Code Reviews
Issue 2694113002:
Delete media/base/yuv_convert and dependents. Prefer libyuv. (Closed)
