[devtools] Support different encodings for Page.CaptureScreenshot.

ui/snapshot/snapshot_mac.mm

 // 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.
 
 #include "ui/snapshot/snapshot.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/mac/scoped_cftyperef.h"
-#include "base/mac/scoped_nsobject.h"
 #include "base/mac/sdk_forward_declarations.h"
 #include "base/task_runner.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/image/image.h"
 
 namespace ui {
 
 bool GrabViewSnapshot(gfx::NativeView view,
-                      std::vector<unsigned char>* png_representation,
+                      gfx::Image* image,
                       const gfx::Rect& snapshot_bounds) {
   NSWindow* window = [view window];
   NSScreen* screen = [[NSScreen screens] firstObject];
   gfx::Rect screen_bounds = gfx::Rect(NSRectToCGRect([screen frame]));
 
 
   // Get the view bounds relative to the screen
   NSRect frame = [view convertRect:[view bounds] toView:nil];
   frame = [window convertRectToScreen:frame];
 
   gfx::Rect view_bounds = gfx::Rect(NSRectToCGRect(frame));
 
   // Flip window coordinates based on the primary screen.
   view_bounds.set_y(
       screen_bounds.height() - view_bounds.y() - view_bounds.height());
 
   // Convert snapshot bounds relative to window into bounds relative to
   // screen.
   gfx::Rect screen_snapshot_bounds = snapshot_bounds;
   screen_snapshot_bounds.Offset(view_bounds.OffsetFromOrigin());
 
   DCHECK_LE(screen_snapshot_bounds.right(), view_bounds.right());
   DCHECK_LE(screen_snapshot_bounds.bottom(), view_bounds.bottom());
 
-  png_representation->clear();
-
   base::ScopedCFTypeRef<CGImageRef> windowSnapshot(
       CGWindowListCreateImage(screen_snapshot_bounds.ToCGRect(),
                               kCGWindowListOptionIncludingWindow,
                               [window windowNumber],
                               kCGWindowImageBoundsIgnoreFraming));
   if (CGImageGetWidth(windowSnapshot) <= 0)
     return false;
 
-  base::scoped_nsobject<NSBitmapImageRep> rep(
-      [[NSBitmapImageRep alloc] initWithCGImage:windowSnapshot]);
-  NSData* data = [rep representationUsingType:NSPNGFileType properties:@{}];
-  const unsigned char* buf = static_cast<const unsigned char*>([data bytes]);
-  NSUInteger length = [data length];
-  if (buf == NULL || length == 0)
-    return false;
-
-  png_representation->assign(buf, buf + length);
-  DCHECK(!png_representation->empty());
-
+  NSImage* nsImage =
+      [[NSImage alloc] initWithCGImage:windowSnapshot size:NSZeroSize];
+  *image = gfx::Image(nsImage);
   return true;
 }
 
 bool GrabWindowSnapshot(gfx::NativeWindow window,
-                        std::vector<unsigned char>* png_representation,
+                        gfx::Image* image,
                         const gfx::Rect& snapshot_bounds) {
   // Make sure to grab the "window frame" view so we get current tab +
   // tabstrip.
-  return GrabViewSnapshot([[window contentView] superview], png_representation,
-      snapshot_bounds);
+  return GrabViewSnapshot([[window contentView] superview], image,
+                          snapshot_bounds);
 }
 
 void GrabWindowSnapshotAndScaleAsync(
     gfx::NativeWindow window,
     const gfx::Rect& snapshot_bounds,
     const gfx::Size& target_size,
     scoped_refptr<base::TaskRunner> background_task_runner,
     GrabWindowSnapshotAsyncCallback callback) {
   callback.Run(gfx::Image());
 }
 
-void GrabViewSnapshotAsync(
-    gfx::NativeView view,
-    const gfx::Rect& source_rect,
-    scoped_refptr<base::TaskRunner> background_task_runner,
-    const GrabWindowSnapshotAsyncPNGCallback& callback) {
-  callback.Run(scoped_refptr<base::RefCountedBytes>());
+void GrabViewSnapshotAsync(gfx::NativeView view,
+                           const gfx::Rect& source_rect,
+                           const GrabWindowSnapshotAsyncCallback& callback) {
+  callback.Run(gfx::Image());
 }
 
-void GrabWindowSnapshotAsync(
-    gfx::NativeWindow window,
-    const gfx::Rect& source_rect,
-    scoped_refptr<base::TaskRunner> background_task_runner,
-    const GrabWindowSnapshotAsyncPNGCallback& callback) {
+void GrabWindowSnapshotAsync(gfx::NativeWindow window,
+                             const gfx::Rect& source_rect,
+                             const GrabWindowSnapshotAsyncCallback& callback) {
   return GrabViewSnapshotAsync([[window contentView] superview], source_rect,
-      background_task_runner, callback);
+                               callback);
 }
 
 }  // namespace ui