Move libvpx from DEPS to src

third_party/libvpx/source/libvpx/vp8/encoder/ssim.c

Index: third_party/libvpx/source/libvpx/vp8/encoder/ssim.c
diff --git a/third_party/libvpx/source/libvpx/vp8/encoder/ssim.c b/third_party/libvpx/source/libvpx/vp8/encoder/ssim.c
new file mode 100644
index 0000000000000000000000000000000000000000..e75160836dc94a9d84231ff2db5b35aed226acc8
--- /dev/null
+++ b/third_party/libvpx/source/libvpx/vp8/encoder/ssim.c
@@ -0,0 +1,233 @@
+/*
+ *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+#include "onyx_int.h"
+
+void vp8_ssim_parms_16x16_c
+(
+    unsigned char *s,
+    int sp,
+    unsigned char *r,
+    int rp,
+    unsigned long *sum_s,
+    unsigned long *sum_r,
+    unsigned long *sum_sq_s,
+    unsigned long *sum_sq_r,
+    unsigned long *sum_sxr
+)
+{
+    int i,j;
+    for(i=0;i<16;i++,s+=sp,r+=rp)
+     {
+         for(j=0;j<16;j++)
+         {
+             *sum_s += s[j];
+             *sum_r += r[j];
+             *sum_sq_s += s[j] * s[j];
+             *sum_sq_r += r[j] * r[j];
+             *sum_sxr += s[j] * r[j];
+         }
+     }
+}
+void vp8_ssim_parms_8x8_c
+(
+    unsigned char *s,
+    int sp,
+    unsigned char *r,
+    int rp,
+    unsigned long *sum_s,
+    unsigned long *sum_r,
+    unsigned long *sum_sq_s,
+    unsigned long *sum_sq_r,
+    unsigned long *sum_sxr
+)
+{
+    int i,j;
+    for(i=0;i<8;i++,s+=sp,r+=rp)
+     {
+         for(j=0;j<8;j++)
+         {
+             *sum_s += s[j];
+             *sum_r += r[j];
+             *sum_sq_s += s[j] * s[j];
+             *sum_sq_r += r[j] * r[j];
+             *sum_sxr += s[j] * r[j];
+         }
+     }
+}
+
+const static int64_t cc1 =  26634; // (64^2*(.01*255)^2
+const static int64_t cc2 = 239708; // (64^2*(.03*255)^2
+
+static double similarity
+(
+    unsigned long sum_s,
+    unsigned long sum_r,
+    unsigned long sum_sq_s,
+    unsigned long sum_sq_r,
+    unsigned long sum_sxr,
+    int count
+)
+{
+    int64_t ssim_n, ssim_d;
+    int64_t c1, c2;
+
+    //scale the constants by number of pixels
+    c1 = (cc1*count*count)>>12;
+    c2 = (cc2*count*count)>>12;
+
+    ssim_n = (2*sum_s*sum_r+ c1)*((int64_t) 2*count*sum_sxr-
+          (int64_t) 2*sum_s*sum_r+c2);
+
+    ssim_d = (sum_s*sum_s +sum_r*sum_r+c1)*
+        ((int64_t)count*sum_sq_s-(int64_t)sum_s*sum_s +
+        (int64_t)count*sum_sq_r-(int64_t) sum_r*sum_r +c2) ;
+
+    return ssim_n * 1.0 / ssim_d;
+}
+
+static double ssim_16x16(unsigned char *s,int sp, unsigned char *r,int rp)
+{
+    unsigned long sum_s=0,sum_r=0,sum_sq_s=0,sum_sq_r=0,sum_sxr=0;
+    vp8_ssim_parms_16x16(s, sp, r, rp, &sum_s, &sum_r, &sum_sq_s, &sum_sq_r, &sum_sxr);
+    return similarity(sum_s, sum_r, sum_sq_s, sum_sq_r, sum_sxr, 256);
+}
+static double ssim_8x8(unsigned char *s,int sp, unsigned char *r,int rp)
+{
+    unsigned long sum_s=0,sum_r=0,sum_sq_s=0,sum_sq_r=0,sum_sxr=0;
+    vp8_ssim_parms_8x8(s, sp, r, rp, &sum_s, &sum_r, &sum_sq_s, &sum_sq_r, &sum_sxr);
+    return similarity(sum_s, sum_r, sum_sq_s, sum_sq_r, sum_sxr, 64);
+}
+
+// TODO: (jbb) tried to scale this function such that we may be able to use it
+// for distortion metric in mode selection code ( provided we do a reconstruction)
+long dssim(unsigned char *s,int sp, unsigned char *r,int rp)
+{
+    unsigned long sum_s=0,sum_r=0,sum_sq_s=0,sum_sq_r=0,sum_sxr=0;
+    int64_t ssim3;
+    int64_t ssim_n1,ssim_n2;
+    int64_t ssim_d1,ssim_d2;
+    int64_t ssim_t1,ssim_t2;
+    int64_t c1, c2;
+
+    // normalize by 256/64
+    c1 = cc1*16;
+    c2 = cc2*16;
+
+    vp8_ssim_parms_16x16(s, sp, r, rp, &sum_s, &sum_r, &sum_sq_s, &sum_sq_r, &sum_sxr);
+    ssim_n1 = (2*sum_s*sum_r+ c1);
+
+    ssim_n2 =((int64_t) 2*256*sum_sxr-(int64_t) 2*sum_s*sum_r+c2);
+
+    ssim_d1 =((int64_t)sum_s*sum_s +(int64_t)sum_r*sum_r+c1);
+
+    ssim_d2 = (256 * (int64_t) sum_sq_s-(int64_t) sum_s*sum_s +
+                    (int64_t) 256*sum_sq_r-(int64_t) sum_r*sum_r +c2) ;
+
+    ssim_t1 = 256 - 256 * ssim_n1 / ssim_d1;
+    ssim_t2 = 256 - 256 * ssim_n2 / ssim_d2;
+
+    ssim3 = 256 *ssim_t1 * ssim_t2;
+    if(ssim3 <0 )
+        ssim3=0;
+    return (long)( ssim3  );
+}
+
+// We are using a 8x8 moving window with starting location of each 8x8 window
+// on the 4x4 pixel grid. Such arrangement allows the windows to overlap
+// block boundaries to penalize blocking artifacts.
+double vp8_ssim2
+(
+    unsigned char *img1,
+    unsigned char *img2,
+    int stride_img1,
+    int stride_img2,
+    int width,
+    int height
+)
+{
+    int i,j;
+    int samples =0;
+    double ssim_total=0;
+
+    // sample point start with each 4x4 location
+    for(i=0; i < height-8; i+=4, img1 += stride_img1*4, img2 += stride_img2*4)
+    {
+        for(j=0; j < width-8; j+=4 )
+        {
+            double v = ssim_8x8(img1+j, stride_img1, img2+j, stride_img2);
+            ssim_total += v;
+            samples++;
+        }
+    }
+    ssim_total /= samples;
+    return ssim_total;
+}
+double vp8_calc_ssim
+(
+    YV12_BUFFER_CONFIG *source,
+    YV12_BUFFER_CONFIG *dest,
+    int lumamask,
+    double *weight
+)
+{
+    double a, b, c;
+    double ssimv;
+
+    a = vp8_ssim2(source->y_buffer, dest->y_buffer,
+                 source->y_stride, dest->y_stride, source->y_width,
+                 source->y_height);
+
+    b = vp8_ssim2(source->u_buffer, dest->u_buffer,
+                 source->uv_stride, dest->uv_stride, source->uv_width,
+                 source->uv_height);
+
+    c = vp8_ssim2(source->v_buffer, dest->v_buffer,
+                 source->uv_stride, dest->uv_stride, source->uv_width,
+                 source->uv_height);
+
+    ssimv = a * .8 + .1 * (b + c);
+
+    *weight = 1;
+
+    return ssimv;
+}
+
+double vp8_calc_ssimg
+(
+    YV12_BUFFER_CONFIG *source,
+    YV12_BUFFER_CONFIG *dest,
+    double *ssim_y,
+    double *ssim_u,
+    double *ssim_v
+)
+{
+    double ssim_all = 0;
+    double a, b, c;
+
+    a = vp8_ssim2(source->y_buffer, dest->y_buffer,
+                 source->y_stride, dest->y_stride, source->y_width,
+                 source->y_height);
+
+    b = vp8_ssim2(source->u_buffer, dest->u_buffer,
+                 source->uv_stride, dest->uv_stride, source->uv_width,
+                 source->uv_height);
+
+    c = vp8_ssim2(source->v_buffer, dest->v_buffer,
+                 source->uv_stride, dest->uv_stride, source->uv_width,
+                 source->uv_height);
+    *ssim_y = a;
+    *ssim_u = b;
+    *ssim_v = c;
+    ssim_all = (a * 4 + b + c) /6;
+
+    return ssim_all;
+}