summaryrefslogtreecommitdiffstats
path: root/widget/windows/TaskbarPreview.cpp
blob: 2b958f84c1c3aec628a03c5c0f6230adfe39bbb0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
/* vim: se cin sw=2 ts=2 et : */
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "TaskbarPreview.h"
#include <nsITaskbarPreviewController.h>
#include <windows.h>

#include <nsError.h>
#include <nsCOMPtr.h>
#include <nsIWidget.h>
#include <nsServiceManagerUtils.h>

#include "nsUXThemeData.h"
#include "nsWindow.h"
#include "nsAppShell.h"
#include "TaskbarPreviewButton.h"
#include "WinUtils.h"

#include "mozilla/dom/HTMLCanvasElement.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/DataSurfaceHelpers.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/Telemetry.h"

// Defined in dwmapi in a header that needs a higher numbered _WINNT #define
#ifndef DWM_SIT_DISPLAYFRAME
#  define DWM_SIT_DISPLAYFRAME 0x1
#endif

namespace mozilla {
namespace widget {

///////////////////////////////////////////////////////////////////////////////
// TaskbarPreview

TaskbarPreview::TaskbarPreview(ITaskbarList4* aTaskbar,
                               nsITaskbarPreviewController* aController,
                               HWND aHWND, nsIDocShell* aShell)
    : mTaskbar(aTaskbar),
      mController(aController),
      mWnd(aHWND),
      mVisible(false),
      mDocShell(do_GetWeakReference(aShell)) {}

TaskbarPreview::~TaskbarPreview() {
  // Avoid dangling pointer
  if (sActivePreview == this) sActivePreview = nullptr;

  // Our subclass should have invoked DetachFromNSWindow already.
  NS_ASSERTION(
      !mWnd,
      "TaskbarPreview::DetachFromNSWindow was not called before destruction");

  // Make sure to release before potentially uninitializing COM
  mTaskbar = nullptr;

  ::CoUninitialize();
}

nsresult TaskbarPreview::Init() {
  // TaskbarPreview may outlive the WinTaskbar that created it
  if (FAILED(::CoInitialize(nullptr))) {
    return NS_ERROR_NOT_INITIALIZED;
  }

  WindowHook* hook = GetWindowHook();
  if (!hook) {
    return NS_ERROR_NOT_AVAILABLE;
  }
  return hook->AddMonitor(WM_DESTROY, MainWindowHook, this);
}

NS_IMETHODIMP
TaskbarPreview::SetController(nsITaskbarPreviewController* aController) {
  NS_ENSURE_ARG(aController);

  mController = aController;
  return NS_OK;
}

NS_IMETHODIMP
TaskbarPreview::GetController(nsITaskbarPreviewController** aController) {
  NS_ADDREF(*aController = mController);
  return NS_OK;
}

NS_IMETHODIMP
TaskbarPreview::GetTooltip(nsAString& aTooltip) {
  aTooltip = mTooltip;
  return NS_OK;
}

NS_IMETHODIMP
TaskbarPreview::SetTooltip(const nsAString& aTooltip) {
  mTooltip = aTooltip;
  return CanMakeTaskbarCalls() ? UpdateTooltip() : NS_OK;
}

NS_IMETHODIMP
TaskbarPreview::SetVisible(bool visible) {
  if (mVisible == visible) return NS_OK;
  mVisible = visible;

  // If the nsWindow has already been destroyed but the caller is still trying
  // to use it then just pretend that everything succeeded.  The caller doesn't
  // actually have a way to detect this since it's the same case as when we
  // CanMakeTaskbarCalls returns false.
  if (!IsWindowAvailable()) return NS_OK;

  return visible ? Enable() : Disable();
}

NS_IMETHODIMP
TaskbarPreview::GetVisible(bool* visible) {
  *visible = mVisible;
  return NS_OK;
}

NS_IMETHODIMP
TaskbarPreview::SetActive(bool active) {
  if (active)
    sActivePreview = this;
  else if (sActivePreview == this)
    sActivePreview = nullptr;

  return CanMakeTaskbarCalls() ? ShowActive(active) : NS_OK;
}

NS_IMETHODIMP
TaskbarPreview::GetActive(bool* active) {
  *active = sActivePreview == this;
  return NS_OK;
}

NS_IMETHODIMP
TaskbarPreview::Invalidate() {
  if (!mVisible) return NS_OK;

  HWND previewWindow = PreviewWindow();
  return FAILED(DwmInvalidateIconicBitmaps(previewWindow)) ? NS_ERROR_FAILURE
                                                           : NS_OK;
}

nsresult TaskbarPreview::UpdateTaskbarProperties() {
  nsresult rv = UpdateTooltip();

  // If we are the active preview and our window is the active window, restore
  // our active state - otherwise some other non-preview window is now active
  // and should be displayed as so.
  if (sActivePreview == this) {
    if (mWnd == ::GetActiveWindow()) {
      nsresult rvActive = ShowActive(true);
      if (NS_FAILED(rvActive)) rv = rvActive;
    } else {
      sActivePreview = nullptr;
    }
  }
  return rv;
}

nsresult TaskbarPreview::Enable() {
  nsresult rv = NS_OK;
  if (CanMakeTaskbarCalls()) {
    rv = UpdateTaskbarProperties();
  } else if (IsWindowAvailable()) {
    WindowHook* hook = GetWindowHook();
    MOZ_ASSERT(hook,
               "IsWindowAvailable() should have eliminated the null case.");
    hook->AddMonitor(nsAppShell::GetTaskbarButtonCreatedMessage(),
                     MainWindowHook, this);
  }
  return rv;
}

nsresult TaskbarPreview::Disable() {
  if (!IsWindowAvailable()) {
    // Window is already destroyed
    return NS_OK;
  }

  WindowHook* hook = GetWindowHook();
  MOZ_ASSERT(hook, "IsWindowAvailable() should have eliminated the null case.");
  (void)hook->RemoveMonitor(nsAppShell::GetTaskbarButtonCreatedMessage(),
                            MainWindowHook, this);

  return NS_OK;
}

bool TaskbarPreview::IsWindowAvailable() const {
  if (mWnd) {
    nsWindow* win = WinUtils::GetNSWindowPtr(mWnd);
    if (win && !win->Destroyed()) {
      return true;
    }
  }
  return false;
}

void TaskbarPreview::DetachFromNSWindow() {
  if (WindowHook* hook = GetWindowHook()) {
    hook->RemoveMonitor(WM_DESTROY, MainWindowHook, this);
  }
  mWnd = nullptr;
}

LRESULT
TaskbarPreview::WndProc(UINT nMsg, WPARAM wParam, LPARAM lParam) {
  switch (nMsg) {
    case WM_DWMSENDICONICTHUMBNAIL: {
      uint32_t width = HIWORD(lParam);
      uint32_t height = LOWORD(lParam);
      float aspectRatio = width / float(height);

      nsresult rv;
      float preferredAspectRatio;
      rv = mController->GetThumbnailAspectRatio(&preferredAspectRatio);
      if (NS_FAILED(rv)) break;

      uint32_t thumbnailWidth = width;
      uint32_t thumbnailHeight = height;

      if (aspectRatio > preferredAspectRatio) {
        thumbnailWidth = uint32_t(thumbnailHeight * preferredAspectRatio);
      } else {
        thumbnailHeight = uint32_t(thumbnailWidth / preferredAspectRatio);
      }

      DrawBitmap(thumbnailWidth, thumbnailHeight, false);
    } break;
    case WM_DWMSENDICONICLIVEPREVIEWBITMAP: {
      uint32_t width, height;
      nsresult rv;
      rv = mController->GetWidth(&width);
      if (NS_FAILED(rv)) break;
      rv = mController->GetHeight(&height);
      if (NS_FAILED(rv)) break;

      double scale = StaticPrefs::layout_css_devPixelsPerPx();
      if (scale <= 0.0) {
        scale = WinUtils::LogToPhysFactor(PreviewWindow());
      }
      DrawBitmap(NSToIntRound(scale * width), NSToIntRound(scale * height),
                 true);
    } break;
  }
  return ::DefWindowProcW(PreviewWindow(), nMsg, wParam, lParam);
}

bool TaskbarPreview::CanMakeTaskbarCalls() {
  // If the nsWindow has already been destroyed and we know it but our caller
  // clearly doesn't so we can't make any calls.
  if (!mWnd) return false;
  // Certain functions like SetTabOrder seem to require a visible window. During
  // window close, the window seems to be hidden before being destroyed.
  if (!::IsWindowVisible(mWnd)) return false;
  if (mVisible) {
    nsWindow* window = WinUtils::GetNSWindowPtr(mWnd);
    NS_ASSERTION(window, "Could not get nsWindow from HWND");
    return window ? window->HasTaskbarIconBeenCreated() : false;
  }
  return false;
}

WindowHook* TaskbarPreview::GetWindowHook() {
  nsWindow* window = WinUtils::GetNSWindowPtr(mWnd);
  NS_ASSERTION(window, "Cannot use taskbar previews in an embedded context!");

  return window ? &window->GetWindowHook() : nullptr;
}

void TaskbarPreview::EnableCustomDrawing(HWND aHWND, bool aEnable) {
  BOOL enabled = aEnable;
  DwmSetWindowAttribute(aHWND, DWMWA_FORCE_ICONIC_REPRESENTATION, &enabled,
                        sizeof(enabled));

  DwmSetWindowAttribute(aHWND, DWMWA_HAS_ICONIC_BITMAP, &enabled,
                        sizeof(enabled));
}

nsresult TaskbarPreview::UpdateTooltip() {
  NS_ASSERTION(CanMakeTaskbarCalls() && mVisible,
               "UpdateTooltip called on invisible tab preview");

  if (FAILED(mTaskbar->SetThumbnailTooltip(PreviewWindow(), mTooltip.get())))
    return NS_ERROR_FAILURE;
  return NS_OK;
}

void TaskbarPreview::DrawBitmap(uint32_t width, uint32_t height,
                                bool isPreview) {
  nsresult rv;
  nsCOMPtr<nsITaskbarPreviewCallback> callback =
      do_CreateInstance("@mozilla.org/widget/taskbar-preview-callback;1", &rv);
  if (NS_FAILED(rv)) {
    return;
  }

  ((TaskbarPreviewCallback*)callback.get())->SetPreview(this);

  if (isPreview) {
    ((TaskbarPreviewCallback*)callback.get())->SetIsPreview();
    mController->RequestPreview(callback);
  } else {
    mController->RequestThumbnail(callback, width, height);
  }
}

///////////////////////////////////////////////////////////////////////////////
// TaskbarPreviewCallback

NS_IMPL_ISUPPORTS(TaskbarPreviewCallback, nsITaskbarPreviewCallback)

/* void done (in nsISupports aCanvas, in boolean aDrawBorder); */
NS_IMETHODIMP
TaskbarPreviewCallback::Done(nsISupports* aCanvas, bool aDrawBorder) {
  // We create and destroy TaskbarTabPreviews from front end code in response
  // to TabOpen and TabClose events. Each TaskbarTabPreview creates and owns a
  // proxy HWND which it hands to Windows as a tab identifier. When a tab
  // closes, TaskbarTabPreview Disable() method is called by front end, which
  // destroys the proxy window and clears mProxyWindow which is the HWND
  // returned from PreviewWindow(). So, since this is async, we should check to
  // be sure the tab is still alive before doing all this gfx work and making
  // dwm calls. To accomplish this we check the result of PreviewWindow().
  if (!aCanvas || !mPreview || !mPreview->PreviewWindow() ||
      !mPreview->IsWindowAvailable()) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<nsIContent> content(do_QueryInterface(aCanvas));
  auto canvas = dom::HTMLCanvasElement::FromNodeOrNull(content);
  if (!canvas) {
    return NS_ERROR_FAILURE;
  }

  RefPtr<gfx::SourceSurface> source = canvas->GetSurfaceSnapshot();
  if (!source) {
    return NS_ERROR_FAILURE;
  }
  RefPtr<gfxWindowsSurface> target = new gfxWindowsSurface(
      source->GetSize(), gfx::SurfaceFormat::A8R8G8B8_UINT32);
  if (target->CairoStatus() != CAIRO_STATUS_SUCCESS) {
    return NS_ERROR_FAILURE;
  }

  using DataSrcSurf = gfx::DataSourceSurface;
  RefPtr<DataSrcSurf> srcSurface = source->GetDataSurface();
  RefPtr<gfxImageSurface> imageSurface = target->GetAsImageSurface();
  if (!srcSurface || !imageSurface) {
    return NS_ERROR_FAILURE;
  }

  if (DataSrcSurf::ScopedMap const sourceMap(srcSurface, DataSrcSurf::READ);
      sourceMap.IsMapped()) {
    mozilla::gfx::CopySurfaceDataToPackedArray(
        sourceMap.GetData(), imageSurface->Data(), srcSurface->GetSize(),
        sourceMap.GetStride(), BytesPerPixel(srcSurface->GetFormat()));
  } else if (source->GetSize().IsEmpty()) {
    // A zero-size source-surface probably shouldn't happen, but is harmless
    // here. Fall through.
  } else {
    return NS_ERROR_FAILURE;
  }

  HDC hDC = target->GetDC();
  HBITMAP hBitmap = (HBITMAP)GetCurrentObject(hDC, OBJ_BITMAP);

  DWORD flags = aDrawBorder ? DWM_SIT_DISPLAYFRAME : 0;
  HRESULT hr;
  if (!mIsThumbnail) {
    POINT pptClient = {0, 0};
    hr = DwmSetIconicLivePreviewBitmap(mPreview->PreviewWindow(), hBitmap,
                                       &pptClient, flags);
  } else {
    hr = DwmSetIconicThumbnail(mPreview->PreviewWindow(), hBitmap, flags);
  }
  MOZ_ASSERT(SUCCEEDED(hr));
  mozilla::Unused << hr;
  return NS_OK;
}

/* static */
bool TaskbarPreview::MainWindowHook(void* aContext, HWND hWnd, UINT nMsg,
                                    WPARAM wParam, LPARAM lParam,
                                    LRESULT* aResult) {
  NS_ASSERTION(nMsg == nsAppShell::GetTaskbarButtonCreatedMessage() ||
                   nMsg == WM_DESTROY,
               "Window hook proc called with wrong message");
  NS_ASSERTION(aContext, "Null context in MainWindowHook");
  if (!aContext) return false;
  TaskbarPreview* preview = reinterpret_cast<TaskbarPreview*>(aContext);
  if (nMsg == WM_DESTROY) {
    // nsWindow is being destroyed
    // We can't really do anything at this point including removing hooks
    return false;
  } else {
    nsWindow* window = WinUtils::GetNSWindowPtr(preview->mWnd);
    if (window) {
      window->SetHasTaskbarIconBeenCreated();

      if (preview->mVisible) preview->UpdateTaskbarProperties();
    }
  }
  return false;
}

TaskbarPreview* TaskbarPreview::sActivePreview = nullptr;

}  // namespace widget
}  // namespace mozilla