libvpx: Add VP9 decoder.

source/libvpx/vp9/common/vp9_recon.c

+/*
+ *  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 "vpx_ports/config.h"
+#include "vp9_rtcd.h"
+#include "vp9/common/vp9_blockd.h"
+
+void vp9_recon_b_c
+(
+  unsigned char *pred_ptr,
+  short *diff_ptr,
+  unsigned char *dst_ptr,
+  int stride
+) {
+  int r, c;
+
+  for (r = 0; r < 4; r++) {
+    for (c = 0; c < 4; c++) {
+      int a = diff_ptr[c] + pred_ptr[c];
+
+      if (a < 0)
+        a = 0;
+
+      if (a > 255)
+        a = 255;
+
+      dst_ptr[c] = (unsigned char) a;
+    }
+
+    dst_ptr += stride;
+    diff_ptr += 16;
+    pred_ptr += 16;
+  }
+}
+
+void vp9_recon_uv_b_c
+(
+  unsigned char *pred_ptr,
+  short *diff_ptr,
+  unsigned char *dst_ptr,
+  int stride
+) {
+  int r, c;
+
+  for (r = 0; r < 4; r++) {
+    for (c = 0; c < 4; c++) {
+      int a = diff_ptr[c] + pred_ptr[c];
+
+      if (a < 0)
+        a = 0;
+
+      if (a > 255)
+        a = 255;
+
+      dst_ptr[c] = (unsigned char) a;
+    }
+
+    dst_ptr += stride;
+    diff_ptr += 8;
+    pred_ptr += 8;
+  }
+}
+void vp9_recon4b_c
+(
+  unsigned char *pred_ptr,
+  short *diff_ptr,
+  unsigned char *dst_ptr,
+  int stride
+) {
+  int r, c;
+
+  for (r = 0; r < 4; r++) {
+    for (c = 0; c < 16; c++) {
+      int a = diff_ptr[c] + pred_ptr[c];
+
+      if (a < 0)
+        a = 0;
+
+      if (a > 255)
+        a = 255;
+
+      dst_ptr[c] = (unsigned char) a;
+    }
+
+    dst_ptr += stride;
+    diff_ptr += 16;
+    pred_ptr += 16;
+  }
+}
+
+void vp9_recon2b_c
+(
+  unsigned char *pred_ptr,
+  short *diff_ptr,
+  unsigned char *dst_ptr,
+  int stride
+) {
+  int r, c;
+
+  for (r = 0; r < 4; r++) {
+    for (c = 0; c < 8; c++) {
+      int a = diff_ptr[c] + pred_ptr[c];
+
+      if (a < 0)
+        a = 0;
+
+      if (a > 255)
+        a = 255;
+
+      dst_ptr[c] = (unsigned char) a;
+    }
+
+    dst_ptr += stride;
+    diff_ptr += 8;
+    pred_ptr += 8;
+  }
+}
+
+#if CONFIG_SUPERBLOCKS
+void vp9_recon_mby_s_c(MACROBLOCKD *xd, uint8_t *dst) {
+  int x, y;
+  BLOCKD *b = &xd->block[0];
+  int stride = b->dst_stride;
+  short *diff = b->diff;
+
+  for (y = 0; y < 16; y++) {
+    for (x = 0; x < 16; x++) {
+      int a = dst[x] + diff[x];
+      if (a < 0)
+        a = 0;
+      else if (a > 255)
+        a = 255;
+      dst[x] = a;
+    }
+    dst += stride;
+    diff += 16;
+  }
+}
+
+void vp9_recon_mbuv_s_c(MACROBLOCKD *xd, uint8_t *udst, uint8_t *vdst) {
+  int x, y, i;
+  uint8_t *dst = udst;
+
+  for (i = 0; i < 2; i++, dst = vdst) {
+    BLOCKD *b = &xd->block[16 + 4 * i];
+    int stride = b->dst_stride;
+    short *diff = b->diff;
+
+    for (y = 0; y < 8; y++) {
+      for (x = 0; x < 8; x++) {
+        int a = dst[x] + diff[x];
+        if (a < 0)
+          a = 0;
+        else if (a > 255)
+          a = 255;
+        dst[x] = a;
+      }
+      dst += stride;
+      diff += 8;
+    }
+  }
+}
+#endif
+
+void vp9_recon_mby_c(MACROBLOCKD *xd) {
+  int i;
+
+  for (i = 0; i < 16; i += 4) {
+    BLOCKD *b = &xd->block[i];
+
+    vp9_recon4b(b->predictor, b->diff, *(b->base_dst) + b->dst, b->dst_stride);
+  }
+}
+
+void vp9_recon_mb_c(MACROBLOCKD *xd) {
+  int i;
+
+  for (i = 0; i < 16; i += 4) {
+    BLOCKD *b = &xd->block[i];
+
+    vp9_recon4b(b->predictor, b->diff, *(b->base_dst) + b->dst, b->dst_stride);
+  }
+
+  for (i = 16; i < 24; i += 2) {
+    BLOCKD *b = &xd->block[i];
+
+    vp9_recon2b(b->predictor, b->diff, *(b->base_dst) + b->dst, b->dst_stride);
+  }
+}