3 files changed, 85 insertions, 0 deletions
diff --git a/chromium/chrome/browser/ui/webui/util/OWNERS b/chromium/chrome/browser/ui/webui/util/OWNERS
new file mode 100644
index 00000000000..13b837bc5f2
--- /dev/null
+++ b/chromium/chrome/browser/ui/webui/util/OWNERS
@@ -0,0 +1,6 @@
+dpapad@chromium.org
+johntlee@chromium.org
+robliao@chromium.org
+tluk@chromium.org
+
+# COMPONENT: UI>Browser>WebUI
+\ No newline at end of file
diff --git a/chromium/chrome/browser/ui/webui/util/image_util.cc b/chromium/chrome/browser/ui/webui/util/image_util.cc
new file mode 100644
index 00000000000..f914194ee67
--- /dev/null
+++ b/chromium/chrome/browser/ui/webui/util/image_util.cc
@@ -0,0 +1,57 @@
+// Copyright (c) 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/ui/webui/util/image_util.h"
+
+#include "base/base64.h"
+#include "third_party/skia/include/core/SkStream.h"
+#include "ui/gfx/image/image_skia.h"
+
+namespace {
+// Writes bytes to a std::vector that can be fetched. This is used to record the
+// output of skia image encoding.
+class BufferWStream : public SkWStream {
+ public:
+  BufferWStream() = default;
+  ~BufferWStream() override = default;
+
+  // Returns the output buffer by moving.
+  std::vector<unsigned char> GetBuffer() { return std::move(result_); }
+
+  // SkWStream:
+  bool write(const void* buffer, size_t size) override {
+    const unsigned char* bytes = reinterpret_cast<const unsigned char*>(buffer);
+    result_.insert(result_.end(), bytes, bytes + size);
+    return true;
+  }
+
+  size_t bytesWritten() const override { return result_.size(); }
+
+ private:
+  std::vector<unsigned char> result_;
+};
+}  // namespace
+
+namespace webui {
+
+std::string MakeDataURIForImage(base::span<const uint8_t> image_data,
+                                base::StringPiece mime_subtype) {
+  std::string result = "data:image/";
+  result.append(mime_subtype.begin(), mime_subtype.end());
+  result += ";base64,";
+  result += base::Base64Encode(image_data);
+  return result;
+}
+
+std::string EncodePNGAndMakeDataURI(gfx::ImageSkia image, float scale_factor) {
+  const SkBitmap& bitmap = image.GetRepresentation(scale_factor).GetBitmap();
+  BufferWStream stream;
+  const bool encoding_succeeded =
+      SkEncodeImage(&stream, bitmap, SkEncodedImageFormat::kPNG, 100);
+  DCHECK(encoding_succeeded);
+  return MakeDataURIForImage(
+      base::as_bytes(base::make_span(stream.GetBuffer())), "png");
+}
+
+}  // namespace webui
diff --git a/chromium/chrome/browser/ui/webui/util/image_util.h b/chromium/chrome/browser/ui/webui/util/image_util.h
new file mode 100644
index 00000000000..fd25a1769eb
--- /dev/null
+++ b/chromium/chrome/browser/ui/webui/util/image_util.h
@@ -0,0 +1,22 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_UI_WEBUI_UTIL_IMAGE_UTIL_H_
+#define CHROME_BROWSER_UI_WEBUI_UTIL_IMAGE_UTIL_H_
+
+#include "base/containers/span.h"
+#include "base/strings/string_piece_forward.h"
+
+namespace gfx {
+class ImageSkia;
+}  // namespace gfx
+
+namespace webui {
+std::string MakeDataURIForImage(base::span<const uint8_t> image_data,
+                                base::StringPiece mime_subtype);
+
+std::string EncodePNGAndMakeDataURI(gfx::ImageSkia image, float scale_factor);
+}  // namespace webui
+
+#endif  // CHROME_BROWSER_UI_WEBUI_UTIL_IMAGE_UTIL_H_