ios/chrome/browser/ui/image_util.mm

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #import <UIKit/UIKit.h>
   6
   7 #import "ios/chrome/browser/ui/image_util.h"
   8
   9 #include "ui/gfx/color_analysis.h"
  10 #include "ui/gfx/image/image.h"
  11
  12 UIColor* DominantColorForImage(const gfx::Image& image, CGFloat opacity) {
  13   SkColor color = color_utils::CalculateKMeanColorOfBitmap(*image.ToSkBitmap());
  14   UIColor* result = [UIColor colorWithRed:SkColorGetR(color) / 255.0
  15                                     green:SkColorGetG(color) / 255.0
  16                                      blue:SkColorGetB(color) / 255.0
  17                                     alpha:opacity];
  18   return result;
  19 }
  20
  21 UIImage* StretchableImageFromUIImage(UIImage* image,
  22                                      NSInteger left_cap_width,
  23                                      NSInteger top_cap_height) {
  24   UIEdgeInsets insets =
  25       UIEdgeInsetsMake(top_cap_height, left_cap_width,
  26                        image.size.height - top_cap_height + 1.0,
  27                        image.size.width - left_cap_width + 1.0);
  28   return [image resizableImageWithCapInsets:insets];
  29 }
  30
  31 UIImage* StretchableImageNamed(NSString* name) {
  32   UIImage* image = [UIImage imageNamed:name];
  33   if (!image)
  34     return nil;
  35   // Returns a copy of |image| configured to stretch at the center pixel.
  36   return StretchableImageFromUIImage(image, floor(image.size.width / 2.0),
  37                                      floor(image.size.height / 2.0));
  38 }
  39
  40 UIImage* StretchableImageNamed(NSString* name,
  41                                NSInteger left_cap_width,
  42                                NSInteger top_cap_height) {
  43   UIImage* image = [UIImage imageNamed:name];
  44   if (!image)
  45     return nil;
  46
  47   return StretchableImageFromUIImage(image, left_cap_width, top_cap_height);
  48 }