import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

gfx/2d/Scale.cpp

@@ -0,0 +1,44 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "Scale.h"
+
+#ifdef USE_SKIA
+#include "HelpersSkia.h"
+#include "skia/include/core/SkBitmap.h"
+#include "image_operations.h"
+#endif
+
+namespace mozilla {
+namespace gfx {
+
+bool Scale(uint8_t* srcData, int32_t srcWidth, int32_t srcHeight, int32_t srcStride,
+           uint8_t* dstData, int32_t dstWidth, int32_t dstHeight, int32_t dstStride,
+           SurfaceFormat format)
+{
+#ifdef USE_SKIA
+  SkBitmap imgSrc;
+  imgSrc.installPixels(MakeSkiaImageInfo(IntSize(srcWidth, srcHeight), format),
+                       srcData, srcStride);
+
+  // Rescaler is compatible with 32 bpp only. Convert to RGB32 if needed.
+  if (imgSrc.colorType() != kBGRA_8888_SkColorType) {
+    imgSrc.copyTo(&imgSrc, kBGRA_8888_SkColorType);
+  }
+
+  // This returns an SkBitmap backed by dstData; since it also wrote to dstData,
+  // we don't need to look at that SkBitmap.
+  SkBitmap result = skia::ImageOperations::Resize(imgSrc,
+                                                  skia::ImageOperations::RESIZE_BEST,
+                                                  dstWidth, dstHeight,
+                                                  dstData);
+
+  return !result.isNull();
+#else
+  return false;
+#endif
+}
+
+} // namespace gfx
+} // namespace mozilla