X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=qscale.c;h=ca7c7dd16152fac40c672e35898ea4450ec680a4;hb=a54fde86bc14f38457f60ab5e1482dac15de4e6e;hp=0f9598f32a29de1fed6b8ba694802a4dae1810a1;hpb=544e75829b0ab9b74f7fe2539801c168c4ab531d;p=qscale diff --git a/qscale.c b/qscale.c index 0f9598f..ca7c7dd 100644 --- a/qscale.c +++ b/qscale.c @@ -1,3 +1,21 @@ +/* + * qscale: Quick, high-quality JPEG-to-JPEG scaler. + * Copyright (C) 2008 Steinar H. Gunderson + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA + */ + #include #include #include @@ -7,12 +25,16 @@ #define CACHE_LINE_FACTOR 16 +#ifndef M_PI +#define M_PI 3.14159265358979323846264 +#endif + double sinc(double x) { - static const double cutoff = 1.220703668e-4; // sqrt(sqrt(eps)) + static const double cutoff = 1.220703668e-4; /* sqrt(sqrt(eps)) */ if (abs(x) < cutoff) { - // For small |x|, use Taylor series instead + /* For small |x|, use Taylor series instead */ const double x2 = x * x; const double x4 = x2 * x2; @@ -62,10 +84,10 @@ void hscale(float *pix, unsigned char *npix, unsigned w, unsigned h, unsigned nw end = w - 1; } - // round up so we get a multiple of four for the SSE code + /* round up so we get a multiple of four for the SSE code */ int num = (end - start + 1); if (num % 4 != 0) { - // prefer aligning it if possible + /* prefer aligning it if possible */ if (start % 4 != 0 && start % 4 <= num % 4) { num += start % 4; start -= start % 4; @@ -105,17 +127,17 @@ void hscale(float *pix, unsigned char *npix, unsigned w, unsigned h, unsigned nw float acc; long tmp; static const float low = 0.0, high = 255.0; - asm ( + __asm__ ( "pxor %1, %1 \n" "xor %2, %2 \n" - ".lbl2: \n" + "0: \n" "movups (%4,%2),%%xmm1 \n" "movups (%3,%2),%%xmm2 \n" "mulps %%xmm2,%%xmm1 \n" "addps %%xmm1,%1 \n" "add $16,%2 \n" "dec %5 \n" - "jnz .lbl2 \n" + "jnz 0b \n" "haddps %1,%1 \n" "haddps %1,%1 \n" "maxss %6,%1 \n" @@ -223,7 +245,7 @@ void vscale(unsigned char *pix, float *npix, unsigned w, unsigned h, unsigned nh * xmm4: current filter coefficient * xmm5, xmm6, xmm7: scratchpad */ - asm ( + __asm__ ( /* clear */ "pxor %%xmm0, %%xmm0 \n" "pxor %%xmm1, %%xmm1 \n" @@ -231,7 +253,7 @@ void vscale(unsigned char *pix, float *npix, unsigned w, unsigned h, unsigned nh "pxor %%xmm3, %%xmm3 \n" /* main loop */ - ".lbl: \n" + "0: \n" /* a zero is useful during unpacking */ "pxor %%xmm4, %%xmm4 \n" @@ -290,7 +312,7 @@ void vscale(unsigned char *pix, float *npix, unsigned w, unsigned h, unsigned nh "add $4, %2 \n" "add %3, %0 \n" "dec %1 \n" - "jnz .lbl \n" + "jnz 0b \n" /* store the values */ "movaps %%xmm0, (%4) \n" @@ -332,13 +354,27 @@ void vscale(unsigned char *pix, float *npix, unsigned w, unsigned h, unsigned nh int main(int argc, char **argv) { + /* user-settable parameters */ unsigned nominal_w = atoi(argv[1]); unsigned nominal_h = atoi(argv[2]); - unsigned samp_h0 = 2, samp_v0 = 2; unsigned samp_h1 = 1, samp_v1 = 1; unsigned samp_h2 = 1, samp_v2 = 1; - unsigned max_samp_h = 2, max_samp_v = 2; + unsigned jpeg_quality = 85; + /* end */ + + unsigned max_samp_h, max_samp_v; + max_samp_h = samp_h0; + if (samp_h1 > max_samp_h) + max_samp_h = samp_h1; + if (samp_h2 > max_samp_h) + max_samp_h = samp_h2; + + max_samp_v = samp_v0; + if (samp_v1 > max_samp_v) + max_samp_v = samp_v1; + if (samp_v2 > max_samp_v) + max_samp_v = samp_v2; unsigned nw0 = nominal_w * samp_h0 / max_samp_h, nh0 = nominal_h * samp_v0 / max_samp_v; unsigned nw1 = nominal_w * samp_h1 / max_samp_h, nh1 = nominal_h * samp_v1 / max_samp_v; @@ -402,21 +438,21 @@ int main(int argc, char **argv) { float *npix = (float*)memalign(16, dinfo.comp_info[0].width_in_blocks * DCTSIZE * nh0 * sizeof(float)); vscale(data_y, npix, dinfo.comp_info[0].width_in_blocks * DCTSIZE, h0, nh0, dinfo.comp_info[0].width_in_blocks * DCTSIZE); - data_ny = (unsigned char *)malloc(nw0 * stride0); + data_ny = (unsigned char *)malloc(nh0 * stride0); hscale(npix, data_ny, w0, nh0, nw0, dinfo.comp_info[0].width_in_blocks * DCTSIZE, stride0); free(npix); } { float *npix = (float*)memalign(16, dinfo.comp_info[1].width_in_blocks * DCTSIZE * nh1 * sizeof(float)); vscale(data_cr, npix, dinfo.comp_info[1].width_in_blocks * DCTSIZE, h1, nh1, dinfo.comp_info[1].width_in_blocks * DCTSIZE); - data_ncr = (unsigned char *)malloc(nw1 * stride1); + data_ncr = (unsigned char *)malloc(nh1 * stride1); hscale(npix, data_ncr, w1, nh1, nw1, dinfo.comp_info[1].width_in_blocks * DCTSIZE, stride1); free(npix); } { float *npix = (float*)memalign(16, dinfo.comp_info[2].width_in_blocks * DCTSIZE * nh2 * sizeof(float)); vscale(data_cb, npix, dinfo.comp_info[2].width_in_blocks * DCTSIZE, h2, nh2, dinfo.comp_info[2].width_in_blocks * DCTSIZE); - data_ncb = (unsigned char *)malloc(nw2 * stride2); + data_ncb = (unsigned char *)malloc(nh2 * stride2); hscale(npix, data_ncb, w2, nh2, nw2, dinfo.comp_info[2].width_in_blocks * DCTSIZE, stride2); free(npix); } @@ -428,7 +464,7 @@ int main(int argc, char **argv) jpeg_stdio_dest(&cinfo, stdout); cinfo.input_components = 3; jpeg_set_defaults(&cinfo); - jpeg_set_quality(&cinfo, 85, FALSE); + jpeg_set_quality(&cinfo, jpeg_quality, FALSE); cinfo.image_width = nominal_w; cinfo.image_height = nominal_h; cinfo.raw_data_in = TRUE; @@ -453,7 +489,7 @@ int main(int argc, char **argv) int i; for (i = 0; i < max_lines; ++i) { - // simple edge extension + /* simple edge extension */ int yline = i + blocks*DCTSIZE*cinfo.comp_info[0].v_samp_factor; if (yline > nh0 - 1) yline = nh0 - 1;