Remove implementation of Panels on OSes other than ChromeOS.

chrome/browser/ui/views/panels/taskbar_window_thumbnailer_win.cc

-// 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 "chrome/browser/ui/views/panels/taskbar_window_thumbnailer_win.h"
-
-#include <dwmapi.h>
-
-#include <algorithm>
-
-#include "base/logging.h"
-#include "base/win/scoped_hdc.h"
-#include "skia/ext/image_operations.h"
-#include "ui/gfx/canvas.h"
-#include "ui/gfx/gdi_util.h"
-
-namespace {
-
-HBITMAP GetNativeBitmapFromSkBitmap(const SkBitmap& bitmap) {
-  int width = bitmap.width();
-  int height = bitmap.height();
-
-  BITMAPV4HEADER native_bitmap_header;
-  gfx::CreateBitmapV4Header(width, height, &native_bitmap_header);
-
-  HDC dc = ::GetDC(NULL);
-  void* bits;
-  HBITMAP native_bitmap = ::CreateDIBSection(dc,
-      reinterpret_cast<BITMAPINFO*>(&native_bitmap_header),
-      DIB_RGB_COLORS,
-      &bits,
-      NULL,
-      0);
-  DCHECK(native_bitmap);
-  ::ReleaseDC(NULL, dc);
-  bitmap.copyPixelsTo(bits, width * height * 4, width * 4);
-  return native_bitmap;
-}
-
-void EnableCustomThumbnail(HWND hwnd, bool enable) {
-  BOOL enable_value = enable;
-  ::DwmSetWindowAttribute(hwnd,
-                          DWMWA_FORCE_ICONIC_REPRESENTATION,
-                          &enable_value,
-                          sizeof(enable_value));
-  ::DwmSetWindowAttribute(hwnd,
-                          DWMWA_HAS_ICONIC_BITMAP,
-                          &enable_value,
-                          sizeof(enable_value));
-}
-
-}  // namespace
-
-
-TaskbarWindowThumbnailerWin::TaskbarWindowThumbnailerWin(
-    HWND hwnd, TaskbarWindowThumbnailerDelegateWin* delegate)
-    : hwnd_(hwnd),
-      delegate_(delegate) {
-  ui::HWNDSubclass::AddFilterToTarget(hwnd_, this);
-}
-
-TaskbarWindowThumbnailerWin::~TaskbarWindowThumbnailerWin() {
-  ui::HWNDSubclass::RemoveFilterFromAllTargets(this);
-}
-
-void TaskbarWindowThumbnailerWin::Start() {
-  EnableCustomThumbnail(hwnd_, true);
-}
-
-void TaskbarWindowThumbnailerWin::Stop() {
-  capture_bitmap_.reset();
-  EnableCustomThumbnail(hwnd_, false);
-}
-
-void TaskbarWindowThumbnailerWin::CaptureSnapshot() {
-  if (!capture_bitmap_)
-    capture_bitmap_.reset(CaptureWindowImage());
-}
-
-void TaskbarWindowThumbnailerWin::InvalidateSnapshot() {
-  capture_bitmap_.reset();
-
-  // The snapshot feeded to the system could be cached. Invalidate it.
-  ::DwmInvalidateIconicBitmaps(hwnd_);
-}
-
-void TaskbarWindowThumbnailerWin::ReplaceWindow(HWND new_hwnd) {
-  // Stop serving the custom thumbnail for the old window.
-  EnableCustomThumbnail(hwnd_, false);
-  ui::HWNDSubclass::RemoveFilterFromAllTargets(this);
-
-  hwnd_ = new_hwnd;
-
-  // Start serving the custom thumbnail to the new window.
-  ui::HWNDSubclass::AddFilterToTarget(hwnd_, this);
-  EnableCustomThumbnail(hwnd_, true);
-}
-
-bool TaskbarWindowThumbnailerWin::FilterMessage(HWND hwnd,
-                                                UINT message,
-                                                WPARAM w_param,
-                                                LPARAM l_param,
-                                                LRESULT* l_result) {
-  DCHECK_EQ(hwnd_, hwnd);
-  switch (message) {
-    case WM_DWMSENDICONICTHUMBNAIL:
-      return OnDwmSendIconicThumbnail(HIWORD(l_param),
-                                      LOWORD(l_param),
-                                      l_result);
-    case WM_DWMSENDICONICLIVEPREVIEWBITMAP:
-      return OnDwmSendIconicLivePreviewBitmap(l_result);
-  }
-  return false;
-}
-
-bool TaskbarWindowThumbnailerWin::OnDwmSendIconicThumbnail(
-    int width, int height, LRESULT* l_result) {
-  CaptureSnapshot();
-
-  SkBitmap* thumbnail_bitmap = capture_bitmap_.get();
-
-  // Scale the image if needed.
-  SkBitmap scaled_bitmap;
-  if (capture_bitmap_->width() != width ||
-      capture_bitmap_->height() != height) {
-    double x_scale = static_cast<double>(width) / capture_bitmap_->width();
-    double y_scale = static_cast<double>(height) / capture_bitmap_->height();
-    double scale = std::min(x_scale, y_scale);
-    width = capture_bitmap_->width() * scale;
-    height = capture_bitmap_->height() * scale;
-    scaled_bitmap = skia::ImageOperations::Resize(
-        *capture_bitmap_, skia::ImageOperations::RESIZE_GOOD, width, height);
-    thumbnail_bitmap = &scaled_bitmap;
-  }
-
-  HBITMAP native_bitmap = GetNativeBitmapFromSkBitmap(*thumbnail_bitmap);
-  ::DwmSetIconicThumbnail(hwnd_, native_bitmap, 0);
-  ::DeleteObject(native_bitmap);
-
-  *l_result = 0;
-  return true;
-}
-
-bool TaskbarWindowThumbnailerWin::OnDwmSendIconicLivePreviewBitmap(
-    LRESULT* l_result) {
-  CaptureSnapshot();
-
-  HBITMAP native_bitmap = GetNativeBitmapFromSkBitmap(*capture_bitmap_);
-  ::DwmSetIconicLivePreviewBitmap(hwnd_, native_bitmap, NULL, 0);
-  ::DeleteObject(native_bitmap);
-  *l_result = 0;
-  return true;
-}
-
-SkBitmap* TaskbarWindowThumbnailerWin::CaptureWindowImage() const {
-  std::vector<HWND> snapshot_hwnds;
-  if (delegate_)
-    snapshot_hwnds = delegate_->GetSnapshotWindowHandles();
-  if (snapshot_hwnds.empty())
-    snapshot_hwnds.push_back(hwnd_);
-
-  int enclosing_x = 0;
-  int enclosing_y = 0;
-  int enclosing_right = 0;
-  int enclosing_bottom = 0;
-  for (std::vector<HWND>::const_iterator iter = snapshot_hwnds.begin();
-       iter != snapshot_hwnds.end(); ++iter) {
-    RECT bounds;
-    if (!::GetWindowRect(*iter, &bounds))
-      continue;
-    if (iter == snapshot_hwnds.begin()) {
-      enclosing_x = bounds.left;
-      enclosing_y = bounds.top;
-      enclosing_right = bounds.right;
-      enclosing_bottom = bounds.bottom;
-    } else {
-      if (bounds.left < enclosing_x)
-        enclosing_x = bounds.left;
-      if (bounds.top < enclosing_y)
-        enclosing_y = bounds.top;
-      if (bounds.right > enclosing_right)
-        enclosing_right = bounds.right;
-      if (bounds.bottom > enclosing_bottom)
-        enclosing_bottom = bounds.bottom;
-    }
-  }
-
-  int width = enclosing_right - enclosing_x;
-  int height = enclosing_bottom - enclosing_y;
-  if (!width || !height)
-    return NULL;
-
-  gfx::Canvas canvas(gfx::Size(width, height), 1.0f, false);
-  {
-    skia::ScopedPlatformPaint scoped_platform_paint(canvas.sk_canvas());
-    HDC target_dc = scoped_platform_paint.GetPlatformSurface();
-    for (std::vector<HWND>::const_iterator iter = snapshot_hwnds.begin();
-         iter != snapshot_hwnds.end(); ++iter) {
-      HWND current_hwnd = *iter;
-      RECT current_bounds;
-      if (!::GetWindowRect(current_hwnd, &current_bounds))
-        continue;
-      base::win::ScopedGetDC source_dc(current_hwnd);
-      ::BitBlt(target_dc,
-               current_bounds.left - enclosing_x,
-               current_bounds.top - enclosing_y,
-               current_bounds.right - current_bounds.left,
-               current_bounds.bottom - current_bounds.top,
-               source_dc,
-               0,
-               0,
-               SRCCOPY);
-      ::ReleaseDC(current_hwnd, source_dc);
-    }
-  }
-  return new SkBitmap(canvas.ExtractImageRep().sk_bitmap());
-}