Add ability to store hidpi theme images in data pack

ui/gfx/image/image_skia_operations.h

 // Copyright (c) 2012 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 UI_GFX_IMAGE_SKIA_OPERATIONS_H_
 #define UI_GFX_IMAGE_SKIA_OPERATIONS_H_
 
 #include "base/gtest_prod_util.h"
 #include "ui/base/ui_export.h"
+#include "ui/gfx/color_utils.h"
 #include "ui/gfx/shadow_value.h"
 
 namespace gfx {
 class ImageSkia;
 class Rect;
 class Size;
 
 class UI_EXPORT ImageSkiaOperations {
  public:
   // Create an image that is a blend of two others. The alpha argument
   // specifies the opacity of the second imag. The provided image must
   // use the kARGB_8888_Config config and be of equal dimensions.
   static ImageSkia CreateBlendedImage(const ImageSkia& first,
                                       const ImageSkia& second,
                                       double alpha);
 
   // Create an image that is the original image masked out by the mask defined
   // in the alpha image. The images must use the kARGB_8888_Config config and
   // be of equal dimensions.
   static ImageSkia CreateMaskedImage(const ImageSkia& first,
                                      const ImageSkia& alpha);
 
   // Create an image that is cropped from another image. This is special
   // because it tiles the original image, so your coordinates can extend
   // outside the bounds of the original image.
   static ImageSkia CreateTiledImage(const ImageSkia& image,
                                     int src_x, int src_y,
                                     int dst_w, int dst_h);
 
+  // Shift an image's HSL values. The shift values are in the range of 0-1,
+  // with the option to specify -1 for 'no change'. The shift values are
+  // defined as:
+  // hsl_shift[0] (hue): The absolute hue value for the image - 0 and 1 map
+  //    to 0 and 360 on the hue color wheel (red).
+  // hsl_shift[1] (saturation): A saturation shift for the image, with the
+  //    following key values:
+  //    0 = remove all color.
+  //    0.5 = leave unchanged.
+  //    1 = fully saturate the image.
+  // hsl_shift[2] (lightness): A lightness shift for the image, with the
+  //    following key values:
+  //    0 = remove all lightness (make all pixels black).
+  //    0.5 = leave unchanged.
+  //    1 = full lightness (make all pixels white).
+  static ImageSkia CreateHSLShiftedImage(const gfx::ImageSkia& image,
+                                         const color_utils::HSL& hsl_shift);
+
   // Creates a button background image by compositing the color and image
   // together, then applying the mask. This is a highly specialized composite
   // operation that is the equivalent of drawing a background in |color|,
   // tiling |image| over the top, and then masking the result out with |mask|.
   // The images must use kARGB_8888_Config config.
   static ImageSkia CreateButtonBackground(SkColor color,
                                           const gfx::ImageSkia& image,
                                           const gfx::ImageSkia& mask);
 
   // Returns an image which is a subset of |image| with bounds |subset_bounds|.
   // The |image| cannot use kA1_Config config.
   static ImageSkia ExtractSubset(const gfx::ImageSkia& image,
                                  const gfx::Rect& subset_bounds);
 
   // Creates an image by resizing |source| to given |target_dip_size|.
   static ImageSkia CreateResizedImage(const ImageSkia& source,
                                       const Size& target_dip_size);
 
   // Creates an image with drop shadow defined in |shadows| for |source|.
   static ImageSkia CreateImageWithDropShadow(const ImageSkia& source,
                                              const ShadowValues& shadows);
 
  private:
   ImageSkiaOperations();  // Class for scoping only.
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_IMAGE_IMAGE_SKIA_OPERATIONS_H_