From 2952874cb8f0bf7ddf44b3bdf39baa93b53eb4a7 Mon Sep 17 00:00:00 2001 From: Francois-Olivier Devaux Date: Tue, 21 Aug 2007 12:42:55 +0000 Subject: [PATCH] Replaced the large ctxno_mag lookup table with a small bit of inline-able branchless code --- ChangeLog | 1 + libopenjpeg/t1.c | 8 +- libopenjpeg/t1_generate_luts.c | 26 ---- libopenjpeg/t1_luts.h | 259 --------------------------------- 4 files changed, 6 insertions(+), 288 deletions(-) diff --git a/ChangeLog b/ChangeLog index 063da5f8..23aa3d9f 100644 --- a/ChangeLog +++ b/ChangeLog @@ -16,6 +16,7 @@ August 21, 2007 * [Callum Lerwick] mqc_setcurctx moved to the header to allow it to be inlined into the t1. * [Callum Lerwick] Consolidated some calls to mqc_setcurctx. * [Callum Lerwick] Cleaned up t1_generate_luts to output the proper types. +* [Callum Lerwick] Replaced the large ctxno_mag lookup table with a small bit of inline-able branchless code August 20, 2007 + [FOD] Added support for the TGA file format in the codec diff --git a/libopenjpeg/t1.c b/libopenjpeg/t1.c index 5a36148b..4341df8b 100644 --- a/libopenjpeg/t1.c +++ b/libopenjpeg/t1.c @@ -41,7 +41,7 @@ static char t1_getctxno_zc(int f, int orient); static char t1_getctxno_sc(int f); -static char t1_getctxno_mag(int f); +static INLINE int t1_getctxno_mag(int f); static char t1_getspb(int f); static short t1_getnmsedec_sig(int x, int bitpos); static short t1_getnmsedec_ref(int x, int bitpos); @@ -232,8 +232,10 @@ static char t1_getctxno_sc(int f) { return lut_ctxno_sc[(f & (T1_SIG_PRIM | T1_SGN)) >> 4]; } -static char t1_getctxno_mag(int f) { - return lut_ctxno_mag[(f & T1_SIG_OTH) | (((f & T1_REFINE) != 0) << 11)]; +static int t1_getctxno_mag(int f) { + int tmp1 = (f & T1_SIG_OTH) ? T1_CTXNO_MAG + 1 : T1_CTXNO_MAG; + int tmp2 = (f & T1_REFINE) ? T1_CTXNO_MAG + 2 : tmp1; + return (tmp2); } static char t1_getspb(int f) { diff --git a/libopenjpeg/t1_generate_luts.c b/libopenjpeg/t1_generate_luts.c index e1f47dfb..af298133 100644 --- a/libopenjpeg/t1_generate_luts.c +++ b/libopenjpeg/t1_generate_luts.c @@ -146,16 +146,6 @@ static int t1_init_ctxno_sc(int f) { return (T1_CTXNO_SC + n); } -static int t1_init_ctxno_mag(int f) { - int n; - if (!(f & T1_REFINE)) - n = (f & (T1_SIG_OTH)) ? 1 : 0; - else - n = 2; - - return (T1_CTXNO_MAG + n); -} - static int t1_init_spb(int f) { int hc, vc, n; @@ -197,7 +187,6 @@ int main(){ double u, v, t; int lut_ctxno_zc[1024]; - int lut_ctxno_mag[4096]; int lut_nmsedec_sig[1 << T1_NMSEDEC_BITS]; int lut_nmsedec_sig0[1 << T1_NMSEDEC_BITS]; int lut_nmsedec_ref[1 << T1_NMSEDEC_BITS]; @@ -229,21 +218,6 @@ int main(){ } printf("0x%x\n};\n\n", t1_init_ctxno_sc(255 << 4)); - // lut_ctxno_mag - for (j = 0; j < 2; ++j) { - for (i = 0; i < 2048; ++i) { - lut_ctxno_mag[(j << 11) + i] = t1_init_ctxno_mag((j ? T1_REFINE : 0) | i); - } - } - - printf("static char lut_ctxno_mag[4096] = {\n "); - for (i = 0; i < 4095; ++i) { - printf("%i, ", lut_ctxno_mag[i]); - if(!((i+1)&0xf)) - printf("\n "); - } - printf("%i\n};\n\n", lut_ctxno_mag[4095]); - // lut_spb printf("static char lut_spb[256] = {\n "); for (i = 0; i < 255; ++i) { diff --git a/libopenjpeg/t1_luts.h b/libopenjpeg/t1_luts.h index 3f957f36..8aa88f7a 100644 --- a/libopenjpeg/t1_luts.h +++ b/libopenjpeg/t1_luts.h @@ -54,265 +54,6 @@ static char lut_ctxno_sc[256] = { 0x9, 0xa, 0xc, 0xd, 0xa, 0xa, 0xd, 0xd, 0xc, 0xd, 0xc, 0xd, 0xd, 0xd, 0xd, 0xd }; -static char lut_ctxno_mag[4096] = { - 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, - 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, - 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, - 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, - 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, - 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, - 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