Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 160 insertions, 0 deletions

diff --git a/media/libwebp/src/utils/rescaler_utils.c b/media/libwebp/src/utils/rescaler_utils.c
new file mode 100644
index 0000000000..a0581a14b1
--- /dev/null
+++ b/media/libwebp/src/utils/rescaler_utils.c
@@ -0,0 +1,160 @@
+// Copyright 2012 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING 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.
+// -----------------------------------------------------------------------------
+//
+// Rescaling functions
+//
+// Author: Skal (pascal.massimino@gmail.com)
+
+#include <assert.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include "src/dsp/dsp.h"
+#include "src/utils/rescaler_utils.h"
+#include "src/utils/utils.h"
+
+//------------------------------------------------------------------------------
+
+int WebPRescalerInit(WebPRescaler* const rescaler,
+                     int src_width, int src_height,
+                     uint8_t* const dst,
+                     int dst_width, int dst_height, int dst_stride,
+                     int num_channels, rescaler_t* const work) {
+  const int x_add = src_width, x_sub = dst_width;
+  const int y_add = src_height, y_sub = dst_height;
+  const uint64_t total_size = 2ull * dst_width * num_channels * sizeof(*work);
+  if (!CheckSizeOverflow(total_size)) return 0;
+
+  rescaler->x_expand = (src_width < dst_width);
+  rescaler->y_expand = (src_height < dst_height);
+  rescaler->src_width = src_width;
+  rescaler->src_height = src_height;
+  rescaler->dst_width = dst_width;
+  rescaler->dst_height = dst_height;
+  rescaler->src_y = 0;
+  rescaler->dst_y = 0;
+  rescaler->dst = dst;
+  rescaler->dst_stride = dst_stride;
+  rescaler->num_channels = num_channels;
+
+  // for 'x_expand', we use bilinear interpolation
+  rescaler->x_add = rescaler->x_expand ? (x_sub - 1) : x_add;
+  rescaler->x_sub = rescaler->x_expand ? (x_add - 1) : x_sub;
+  if (!rescaler->x_expand) {  // fx_scale is not used otherwise
+    rescaler->fx_scale = WEBP_RESCALER_FRAC(1, rescaler->x_sub);
+  }
+  // vertical scaling parameters
+  rescaler->y_add = rescaler->y_expand ? y_add - 1 : y_add;
+  rescaler->y_sub = rescaler->y_expand ? y_sub - 1 : y_sub;
+  rescaler->y_accum = rescaler->y_expand ? rescaler->y_sub : rescaler->y_add;
+  if (!rescaler->y_expand) {
+    // This is WEBP_RESCALER_FRAC(dst_height, x_add * y_add) without the cast.
+    // Its value is <= WEBP_RESCALER_ONE, because dst_height <= rescaler->y_add
+    // and rescaler->x_add >= 1;
+    const uint64_t num = (uint64_t)dst_height * WEBP_RESCALER_ONE;
+    const uint64_t den = (uint64_t)rescaler->x_add * rescaler->y_add;
+    const uint64_t ratio = num / den;
+    if (ratio != (uint32_t)ratio) {
+      // When ratio == WEBP_RESCALER_ONE, we can't represent the ratio with the
+      // current fixed-point precision. This happens when src_height ==
+      // rescaler->y_add (which == src_height), and rescaler->x_add == 1.
+      // => We special-case fxy_scale = 0, in WebPRescalerExportRow().
+      rescaler->fxy_scale = 0;
+    } else {
+      rescaler->fxy_scale = (uint32_t)ratio;
+    }
+    rescaler->fy_scale = WEBP_RESCALER_FRAC(1, rescaler->y_sub);
+  } else {
+    rescaler->fy_scale = WEBP_RESCALER_FRAC(1, rescaler->x_add);
+    // rescaler->fxy_scale is unused here.
+  }
+  rescaler->irow = work;
+  rescaler->frow = work + num_channels * dst_width;
+  memset(work, 0, (size_t)total_size);
+
+  WebPRescalerDspInit();
+  return 1;
+}
+
+int WebPRescalerGetScaledDimensions(int src_width, int src_height,
+                                    int* const scaled_width,
+                                    int* const scaled_height) {
+  assert(scaled_width != NULL);
+  assert(scaled_height != NULL);
+  {
+    int width = *scaled_width;
+    int height = *scaled_height;
+    const int max_size = INT_MAX / 2;
+
+    // if width is unspecified, scale original proportionally to height ratio.
+    if (width == 0 && src_height > 0) {
+      width =
+          (int)(((uint64_t)src_width * height + src_height - 1) / src_height);
+    }
+    // if height is unspecified, scale original proportionally to width ratio.
+    if (height == 0 && src_width > 0) {
+      height =
+          (int)(((uint64_t)src_height * width + src_width - 1) / src_width);
+    }
+    // Check if the overall dimensions still make sense.
+    if (width <= 0 || height <= 0 || width > max_size || height > max_size) {
+      return 0;
+    }
+
+    *scaled_width = width;
+    *scaled_height = height;
+    return 1;
+  }
+}
+
+//------------------------------------------------------------------------------
+// all-in-one calls
+
+int WebPRescaleNeededLines(const WebPRescaler* const rescaler,
+                           int max_num_lines) {
+  const int num_lines =
+      (rescaler->y_accum + rescaler->y_sub - 1) / rescaler->y_sub;
+  return (num_lines > max_num_lines) ? max_num_lines : num_lines;
+}
+
+int WebPRescalerImport(WebPRescaler* const rescaler, int num_lines,
+                       const uint8_t* src, int src_stride) {
+  int total_imported = 0;
+  while (total_imported < num_lines &&
+         !WebPRescalerHasPendingOutput(rescaler)) {
+    if (rescaler->y_expand) {
+      rescaler_t* const tmp = rescaler->irow;
+      rescaler->irow = rescaler->frow;
+      rescaler->frow = tmp;
+    }
+    WebPRescalerImportRow(rescaler, src);
+    if (!rescaler->y_expand) {    // Accumulate the contribution of the new row.
+      int x;
+      for (x = 0; x < rescaler->num_channels * rescaler->dst_width; ++x) {
+        rescaler->irow[x] += rescaler->frow[x];
+      }
+    }
+    ++rescaler->src_y;
+    src += src_stride;
+    ++total_imported;
+    rescaler->y_accum -= rescaler->y_sub;
+  }
+  return total_imported;
+}
+
+int WebPRescalerExport(WebPRescaler* const rescaler) {
+  int total_exported = 0;
+  while (WebPRescalerHasPendingOutput(rescaler)) {
+    WebPRescalerExportRow(rescaler);
+    ++total_exported;
+  }
+  return total_exported;
+}
+
+//------------------------------------------------------------------------------