325 lines
9.5 KiB
NASM
325 lines
9.5 KiB
NASM
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; jcsample.asm - downsampling (MMX)
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;
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; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
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; Copyright (C) 2016, D. R. Commander.
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;
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; Based on the x86 SIMD extension for IJG JPEG library
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; Copyright (C) 1999-2006, MIYASAKA Masaru.
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; For conditions of distribution and use, see copyright notice in jsimdext.inc
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;
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; This file should be assembled with NASM (Netwide Assembler),
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; can *not* be assembled with Microsoft's MASM or any compatible
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; assembler (including Borland's Turbo Assembler).
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; NASM is available from http://nasm.sourceforge.net/ or
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; http://sourceforge.net/project/showfiles.php?group_id=6208
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%include "jsimdext.inc"
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; --------------------------------------------------------------------------
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SECTION SEG_TEXT
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BITS 32
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;
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; Downsample pixel values of a single component.
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; This version handles the common case of 2:1 horizontal and 1:1 vertical,
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; without smoothing.
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;
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; GLOBAL(void)
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; jsimd_h2v1_downsample_mmx(JDIMENSION image_width, int max_v_samp_factor,
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; JDIMENSION v_samp_factor,
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; JDIMENSION width_in_blocks, JSAMPARRAY input_data,
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; JSAMPARRAY output_data);
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;
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%define img_width(b) (b) + 8 ; JDIMENSION image_width
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%define max_v_samp(b) (b) + 12 ; int max_v_samp_factor
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%define v_samp(b) (b) + 16 ; JDIMENSION v_samp_factor
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%define width_blks(b) (b) + 20 ; JDIMENSION width_in_blocks
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%define input_data(b) (b) + 24 ; JSAMPARRAY input_data
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%define output_data(b) (b) + 28 ; JSAMPARRAY output_data
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align 32
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GLOBAL_FUNCTION(jsimd_h2v1_downsample_mmx)
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EXTN(jsimd_h2v1_downsample_mmx):
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push ebp
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mov ebp, esp
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; push ebx ; unused
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; push ecx ; need not be preserved
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; push edx ; need not be preserved
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push esi
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push edi
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mov ecx, JDIMENSION [width_blks(ebp)]
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shl ecx, 3 ; imul ecx,DCTSIZE (ecx = output_cols)
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jz near .return
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mov edx, JDIMENSION [img_width(ebp)]
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; -- expand_right_edge
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push ecx
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shl ecx, 1 ; output_cols * 2
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sub ecx, edx
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jle short .expand_end
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mov eax, INT [max_v_samp(ebp)]
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test eax, eax
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jle short .expand_end
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cld
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mov esi, JSAMPARRAY [input_data(ebp)] ; input_data
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alignx 16, 7
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.expandloop:
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push eax
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push ecx
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mov edi, JSAMPROW [esi]
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add edi, edx
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mov al, JSAMPLE [edi-1]
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rep stosb
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pop ecx
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pop eax
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add esi, byte SIZEOF_JSAMPROW
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dec eax
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jg short .expandloop
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.expand_end:
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pop ecx ; output_cols
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; -- h2v1_downsample
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mov eax, JDIMENSION [v_samp(ebp)] ; rowctr
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test eax, eax
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jle near .return
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mov edx, 0x00010000 ; bias pattern
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movd mm7, edx
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pcmpeqw mm6, mm6
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punpckldq mm7, mm7 ; mm7={0, 1, 0, 1}
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psrlw mm6, BYTE_BIT ; mm6={0xFF 0x00 0xFF 0x00 ..}
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mov esi, JSAMPARRAY [input_data(ebp)] ; input_data
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mov edi, JSAMPARRAY [output_data(ebp)] ; output_data
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alignx 16, 7
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.rowloop:
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push ecx
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push edi
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push esi
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mov esi, JSAMPROW [esi] ; inptr
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mov edi, JSAMPROW [edi] ; outptr
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alignx 16, 7
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.columnloop:
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movq mm0, MMWORD [esi+0*SIZEOF_MMWORD]
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movq mm1, MMWORD [esi+1*SIZEOF_MMWORD]
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movq mm2, mm0
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movq mm3, mm1
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pand mm0, mm6
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psrlw mm2, BYTE_BIT
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pand mm1, mm6
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psrlw mm3, BYTE_BIT
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paddw mm0, mm2
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paddw mm1, mm3
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paddw mm0, mm7
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paddw mm1, mm7
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psrlw mm0, 1
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psrlw mm1, 1
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packuswb mm0, mm1
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movq MMWORD [edi+0*SIZEOF_MMWORD], mm0
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add esi, byte 2*SIZEOF_MMWORD ; inptr
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add edi, byte 1*SIZEOF_MMWORD ; outptr
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sub ecx, byte SIZEOF_MMWORD ; outcol
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jnz short .columnloop
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pop esi
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pop edi
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pop ecx
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add esi, byte SIZEOF_JSAMPROW ; input_data
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add edi, byte SIZEOF_JSAMPROW ; output_data
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dec eax ; rowctr
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jg short .rowloop
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emms ; empty MMX state
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.return:
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pop edi
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pop esi
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; pop edx ; need not be preserved
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; pop ecx ; need not be preserved
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; pop ebx ; unused
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pop ebp
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ret
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; --------------------------------------------------------------------------
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;
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; Downsample pixel values of a single component.
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; This version handles the standard case of 2:1 horizontal and 2:1 vertical,
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; without smoothing.
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;
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; GLOBAL(void)
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; jsimd_h2v2_downsample_mmx(JDIMENSION image_width, int max_v_samp_factor,
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; JDIMENSION v_samp_factor,
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; JDIMENSION width_in_blocks, JSAMPARRAY input_data,
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; JSAMPARRAY output_data);
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;
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%define img_width(b) (b) + 8 ; JDIMENSION image_width
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%define max_v_samp(b) (b) + 12 ; int max_v_samp_factor
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%define v_samp(b) (b) + 16 ; JDIMENSION v_samp_factor
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%define width_blks(b) (b) + 20 ; JDIMENSION width_in_blocks
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%define input_data(b) (b) + 24 ; JSAMPARRAY input_data
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%define output_data(b) (b) + 28 ; JSAMPARRAY output_data
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align 32
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GLOBAL_FUNCTION(jsimd_h2v2_downsample_mmx)
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EXTN(jsimd_h2v2_downsample_mmx):
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push ebp
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mov ebp, esp
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; push ebx ; unused
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; push ecx ; need not be preserved
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; push edx ; need not be preserved
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push esi
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push edi
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mov ecx, JDIMENSION [width_blks(ebp)]
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shl ecx, 3 ; imul ecx,DCTSIZE (ecx = output_cols)
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jz near .return
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mov edx, JDIMENSION [img_width(ebp)]
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; -- expand_right_edge
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push ecx
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shl ecx, 1 ; output_cols * 2
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sub ecx, edx
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jle short .expand_end
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mov eax, INT [max_v_samp(ebp)]
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test eax, eax
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jle short .expand_end
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cld
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mov esi, JSAMPARRAY [input_data(ebp)] ; input_data
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alignx 16, 7
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.expandloop:
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push eax
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push ecx
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mov edi, JSAMPROW [esi]
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add edi, edx
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mov al, JSAMPLE [edi-1]
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rep stosb
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pop ecx
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pop eax
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add esi, byte SIZEOF_JSAMPROW
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dec eax
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jg short .expandloop
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.expand_end:
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pop ecx ; output_cols
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; -- h2v2_downsample
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mov eax, JDIMENSION [v_samp(ebp)] ; rowctr
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test eax, eax
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jle near .return
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mov edx, 0x00020001 ; bias pattern
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movd mm7, edx
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pcmpeqw mm6, mm6
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punpckldq mm7, mm7 ; mm7={1, 2, 1, 2}
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psrlw mm6, BYTE_BIT ; mm6={0xFF 0x00 0xFF 0x00 ..}
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mov esi, JSAMPARRAY [input_data(ebp)] ; input_data
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mov edi, JSAMPARRAY [output_data(ebp)] ; output_data
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alignx 16, 7
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.rowloop:
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push ecx
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push edi
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push esi
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mov edx, JSAMPROW [esi+0*SIZEOF_JSAMPROW] ; inptr0
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mov esi, JSAMPROW [esi+1*SIZEOF_JSAMPROW] ; inptr1
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mov edi, JSAMPROW [edi] ; outptr
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alignx 16, 7
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.columnloop:
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movq mm0, MMWORD [edx+0*SIZEOF_MMWORD]
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movq mm1, MMWORD [esi+0*SIZEOF_MMWORD]
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movq mm2, MMWORD [edx+1*SIZEOF_MMWORD]
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movq mm3, MMWORD [esi+1*SIZEOF_MMWORD]
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movq mm4, mm0
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movq mm5, mm1
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pand mm0, mm6
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psrlw mm4, BYTE_BIT
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pand mm1, mm6
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psrlw mm5, BYTE_BIT
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paddw mm0, mm4
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paddw mm1, mm5
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movq mm4, mm2
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movq mm5, mm3
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pand mm2, mm6
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psrlw mm4, BYTE_BIT
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pand mm3, mm6
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psrlw mm5, BYTE_BIT
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paddw mm2, mm4
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paddw mm3, mm5
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paddw mm0, mm1
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paddw mm2, mm3
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paddw mm0, mm7
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paddw mm2, mm7
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psrlw mm0, 2
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psrlw mm2, 2
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packuswb mm0, mm2
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movq MMWORD [edi+0*SIZEOF_MMWORD], mm0
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add edx, byte 2*SIZEOF_MMWORD ; inptr0
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add esi, byte 2*SIZEOF_MMWORD ; inptr1
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add edi, byte 1*SIZEOF_MMWORD ; outptr
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sub ecx, byte SIZEOF_MMWORD ; outcol
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jnz near .columnloop
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pop esi
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pop edi
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pop ecx
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add esi, byte 2*SIZEOF_JSAMPROW ; input_data
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add edi, byte 1*SIZEOF_JSAMPROW ; output_data
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dec eax ; rowctr
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jg near .rowloop
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emms ; empty MMX state
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.return:
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pop edi
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pop esi
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; pop edx ; need not be preserved
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; pop ecx ; need not be preserved
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; pop ebx ; unused
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pop ebp
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ret
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; For some reason, the OS X linker does not honor the request to align the
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; segment unless we do this.
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align 32
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