src/ui/snapshot/snapshot_mac_unittest.mm

   1 // Copyright (c) 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 #include "ui/snapshot/snapshot.h"
   6
   7 #import <Cocoa/Cocoa.h>
   8
   9 #include "base/mac/scoped_nsobject.h"
  10 #include "base/mac/sdk_forward_declarations.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "testing/platform_test.h"
  13 #include "ui/gfx/rect.h"
  14
  15 namespace ui {
  16 namespace {
  17
  18 typedef PlatformTest GrabWindowSnapshotTest;
  19
  20 TEST_F(GrabWindowSnapshotTest, TestGrabWindowSnapshot) {
  21   // Launch a test window so we can take a snapshot.
  22   NSRect frame = NSMakeRect(0, 0, 400, 400);
  23   base::scoped_nsobject<NSWindow> window(
  24       [[NSWindow alloc] initWithContentRect:frame
  25                                   styleMask:NSBorderlessWindowMask
  26                                     backing:NSBackingStoreBuffered
  27                                       defer:NO]);
  28   [window setBackgroundColor:[NSColor whiteColor]];
  29   [window makeKeyAndOrderFront:NSApp];
  30
  31   scoped_ptr<std::vector<unsigned char> > png_representation(
  32       new std::vector<unsigned char>);
  33   gfx::Rect bounds = gfx::Rect(0, 0, frame.size.width, frame.size.height);
  34   EXPECT_TRUE(ui::GrabWindowSnapshot(window, png_representation.get(),
  35                                            bounds));
  36
  37   // Copy png back into NSData object so we can make sure we grabbed a png.
  38   base::scoped_nsobject<NSData> image_data(
  39       [[NSData alloc] initWithBytes:&(*png_representation)[0]
  40                              length:png_representation->size()]);
  41   NSBitmapImageRep* rep = [NSBitmapImageRep imageRepWithData:image_data.get()];
  42   EXPECT_TRUE([rep isKindOfClass:[NSBitmapImageRep class]]);
  43   CGFloat scaleFactor = 1.0f;
  44   if ([window respondsToSelector:@selector(backingScaleFactor)])
  45     scaleFactor = [window backingScaleFactor];
  46   EXPECT_EQ(400 * scaleFactor, CGImageGetWidth([rep CGImage]));
  47   NSColor* color = [rep colorAtX:200 * scaleFactor y:200 * scaleFactor];
  48   CGFloat red = 0, green = 0, blue = 0, alpha = 0;
  49   [color getRed:&red green:&green blue:&blue alpha:&alpha];
  50   EXPECT_GE(red + green + blue, 3.0);
  51 }
  52
  53 }  // namespace
  54 }  // namespace ui