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/logging.h" 10 #include "base/mac/scoped_cftyperef.h" 11 #include "base/mac/scoped_nsobject.h" 12 #include "ui/gfx/rect.h" 13 14 namespace ui { 15 16 bool GrabViewSnapshot(gfx::NativeView view, 17 std::vector<unsigned char>* png_representation, 18 const gfx::Rect& snapshot_bounds) { 19 NSWindow* window = [view window]; 20 NSScreen* screen = [[NSScreen screens] objectAtIndex:0]; 21 gfx::Rect screen_bounds = gfx::Rect(NSRectToCGRect([screen frame])); 22 23 24 // Get the view bounds relative to the screen 25 NSRect frame = [view convertRect:[view bounds] toView:nil]; 26 frame.origin = [window convertBaseToScreen:frame.origin]; 27 28 gfx::Rect view_bounds = gfx::Rect(NSRectToCGRect(frame)); 29 30 // Flip window coordinates based on the primary screen. 31 view_bounds.set_y( 32 screen_bounds.height() - view_bounds.y() - view_bounds.height()); 33 34 // Convert snapshot bounds relative to window into bounds relative to 35 // screen. 36 gfx::Rect screen_snapshot_bounds = snapshot_bounds; 37 screen_snapshot_bounds.Offset(view_bounds.OffsetFromOrigin()); 38 39 DCHECK_LE(screen_snapshot_bounds.right(), view_bounds.right()); 40 DCHECK_LE(screen_snapshot_bounds.bottom(), view_bounds.bottom()); 41 42 png_representation->clear(); 43 44 base::ScopedCFTypeRef<CGImageRef> windowSnapshot( 45 CGWindowListCreateImage(screen_snapshot_bounds.ToCGRect(), 46 kCGWindowListOptionIncludingWindow, 47 [window windowNumber], 48 kCGWindowImageBoundsIgnoreFraming)); 49 if (CGImageGetWidth(windowSnapshot) <= 0) 50 return false; 51 52 base::scoped_nsobject<NSBitmapImageRep> rep( 53 [[NSBitmapImageRep alloc] initWithCGImage:windowSnapshot]); 54 NSData* data = [rep representationUsingType:NSPNGFileType properties:nil]; 55 const unsigned char* buf = static_cast<const unsigned char*>([data bytes]); 56 NSUInteger length = [data length]; 57 if (buf == NULL || length == 0) 58 return false; 59 60 png_representation->assign(buf, buf + length); 61 DCHECK(!png_representation->empty()); 62 63 return true; 64 } 65 66 bool GrabWindowSnapshot(gfx::NativeWindow window, 67 std::vector<unsigned char>* png_representation, 68 const gfx::Rect& snapshot_bounds) { 69 // Make sure to grab the "window frame" view so we get current tab + 70 // tabstrip. 71 return GrabViewSnapshot([[window contentView] superview], png_representation, 72 snapshot_bounds); 73 } 74 75 } // namespace ui 76
