• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1// Copyright (c) 2014 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 <QuartzCore/QuartzCore.h>
6#import <UIKit/UIKit.h>
7
8#include "base/logging.h"
9#include "base/mac/scoped_cftyperef.h"
10#include "testing/gtest/include/gtest/gtest.h"
11#include "ui/gfx/image/image.h"
12#include "ui/gfx/image/image_skia.h"
13
14namespace {
15
16// Helper function to return a UIImage with the given size and scale.
17UIImage* UIImageWithSizeAndScale(CGFloat width, CGFloat height, CGFloat scale) {
18  CGSize target_size = CGSizeMake(width * scale, height * scale);
19
20  // Create a UIImage directly from a CGImage in order to control the exact
21  // pixel size of the underlying image.
22  base::ScopedCFTypeRef<CGColorSpaceRef> color_space(
23      CGColorSpaceCreateDeviceRGB());
24  base::ScopedCFTypeRef<CGContextRef> context(CGBitmapContextCreate(
25      NULL,
26      target_size.width,
27      target_size.height,
28      8,
29      target_size.width * 4,
30      color_space,
31      kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
32
33  CGRect target_rect = CGRectMake(0, 0,
34                                  target_size.width, target_size.height);
35  CGContextSetFillColorWithColor(context, [[UIColor redColor] CGColor]);
36  CGContextFillRect(context, target_rect);
37
38  base::ScopedCFTypeRef<CGImageRef> cg_image(
39      CGBitmapContextCreateImage(context));
40  return [UIImage imageWithCGImage:cg_image
41                             scale:scale
42                       orientation:UIImageOrientationUp];
43}
44
45
46class ImageIOSTest : public testing::Test {
47 public:
48  ImageIOSTest() {}
49  virtual ~ImageIOSTest() {}
50
51  virtual void SetUp() OVERRIDE {
52    original_scale_factors_ = gfx::ImageSkia::GetSupportedScales();
53  }
54
55  virtual void TearDown() OVERRIDE {
56    gfx::ImageSkia::SetSupportedScales(original_scale_factors_);
57  }
58
59 private:
60  // Used to save and restore the scale factors in effect before this test.
61  std::vector<float> original_scale_factors_;
62
63  DISALLOW_COPY_AND_ASSIGN(ImageIOSTest);
64};
65
66// Tests image conversion when the scale factor of the source image is not in
67// the list of supported scale factors.
68TEST_F(ImageIOSTest, ImageConversionWithUnsupportedScaleFactor) {
69  const CGFloat kWidth = 200;
70  const CGFloat kHeight = 100;
71  const CGFloat kTestScales[3] = { 1.0f, 2.0f, 3.0f };
72
73  for (size_t i = 0; i < arraysize(kTestScales); ++i) {
74    for (size_t j = 0; j < arraysize(kTestScales); ++j) {
75      const CGFloat source_scale = kTestScales[i];
76      const CGFloat supported_scale = kTestScales[j];
77
78      // Set the supported scale for testing.
79      std::vector<float> supported_scales;
80      supported_scales.push_back(supported_scale);
81      gfx::ImageSkia::SetSupportedScales(supported_scales);
82
83      // Create an UIImage with the appropriate source_scale.
84      UIImage* ui_image =
85          UIImageWithSizeAndScale(kWidth, kHeight, source_scale);
86      ASSERT_EQ(kWidth, ui_image.size.width);
87      ASSERT_EQ(kHeight, ui_image.size.height);
88      ASSERT_EQ(source_scale, ui_image.scale);
89
90      // Convert to SkBitmap and test its size.
91      gfx::Image to_skbitmap([ui_image retain]);
92      const SkBitmap* bitmap = to_skbitmap.ToSkBitmap();
93      ASSERT_TRUE(bitmap != NULL);
94      EXPECT_EQ(kWidth * supported_scale, bitmap->width());
95      EXPECT_EQ(kHeight * supported_scale, bitmap->height());
96
97      // Convert to ImageSkia and test its size.
98      gfx::Image to_imageskia([ui_image retain]);
99      const gfx::ImageSkia* imageskia = to_imageskia.ToImageSkia();
100      EXPECT_EQ(kWidth, imageskia->width());
101      EXPECT_EQ(kHeight, imageskia->height());
102
103      // TODO(rohitrao): Convert from ImageSkia back to UIImage.  This should
104      // scale the image based on the current set of supported scales.
105    }
106  }
107}
108
109} // namespace
110