The Tor Browser: widget/windows/nsWindowGfx.cpp@ac0c01689b40 (annotated)

widget/windows/nsWindowGfx.cpp@ac0c01689b40 (annotated)

widget/windows/nsWindowGfx.cpp

Thu, 15 Jan 2015 15:59:08 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:59:08 +0100
branch: TOR_BUG_9701
changeset 10: ac0c01689b40
permissions: -rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- 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/. */
 /*
  * nsWindowGfx - Painting and aceleration.
  */
 // XXX Future: this should really be a stand alone class stored as
 // a member of nsWindow with getters and setters for things like render
 // mode and methods for handling paint.
 /**************************************************************
  **************************************************************
  **
  ** BLOCK: Includes
  **
  ** Include headers.
  **
  **************************************************************
  **************************************************************/
 #include "mozilla/plugins/PluginInstanceParent.h"
 using mozilla::plugins::PluginInstanceParent;
 #include "nsWindowGfx.h"
 #include <windows.h>
 #include "gfxImageSurface.h"
 #include "gfxUtils.h"
 #include "gfxWindowsSurface.h"
 #include "gfxWindowsPlatform.h"
 #include "mozilla/gfx/2D.h"
 #include "mozilla/gfx/DataSurfaceHelpers.h"
 #include "mozilla/gfx/Tools.h"
 #include "mozilla/RefPtr.h"
 #include "nsGfxCIID.h"
 #include "gfxContext.h"
 #include "nsRenderingContext.h"
 #include "prmem.h"
 #include "WinUtils.h"
 #include "nsIWidgetListener.h"
 #include "mozilla/unused.h"
 #ifdef MOZ_ENABLE_D3D9_LAYER
 #include "LayerManagerD3D9.h"
 #endif
 #ifdef MOZ_ENABLE_D3D10_LAYER
 #include "LayerManagerD3D10.h"
 #endif
 #include "mozilla/layers/CompositorParent.h"
 #include "ClientLayerManager.h"
 #include "nsUXThemeData.h"
 #include "nsUXThemeConstants.h"
 extern "C" {
 #define PIXMAN_DONT_DEFINE_STDINT
 #include "pixman.h"
 }
 using namespace mozilla;
 using namespace mozilla::gfx;
 using namespace mozilla::layers;
 using namespace mozilla::widget;
 /**************************************************************
  **************************************************************
  **
  ** BLOCK: Variables
  **
  ** nsWindow Class static initializations and global variables.
  **
  **************************************************************
  **************************************************************/
 /**************************************************************
  *
  * SECTION: nsWindow statics
  *
  **************************************************************/
 static nsAutoPtr<uint8_t>  sSharedSurfaceData;
 static gfxIntSize          sSharedSurfaceSize;
 struct IconMetrics {
   int32_t xMetric;
   int32_t yMetric;
   int32_t defaultSize;
 };
 // Corresponds 1:1 to the IconSizeType enum
 static IconMetrics sIconMetrics[] = {
   {SM_CXSMICON, SM_CYSMICON, 16}, // small icon
   {SM_CXICON,   SM_CYICON,   32}  // regular icon
 };
 /**************************************************************
  **************************************************************
  **
  ** BLOCK: nsWindowGfx impl.
  **
  ** Misc. graphics related utilities.
  **
  **************************************************************
  **************************************************************/
 /* static */ bool
 nsWindow::IsRenderMode(gfxWindowsPlatform::RenderMode rmode)
 {
   return gfxWindowsPlatform::GetPlatform()->GetRenderMode() == rmode;
 }
 /**************************************************************
  **************************************************************
  **
  ** BLOCK: nsWindow impl.
  **
  ** Paint related nsWindow methods.
  **
  **************************************************************
  **************************************************************/
 // GetRegionToPaint returns the invalidated region that needs to be painted
 nsIntRegion nsWindow::GetRegionToPaint(bool aForceFullRepaint,
                                        PAINTSTRUCT ps, HDC aDC)
 {
   if (aForceFullRepaint) {
     RECT paintRect;
     ::GetClientRect(mWnd, &paintRect);
     return nsIntRegion(WinUtils::ToIntRect(paintRect));
   }
   HRGN paintRgn = ::CreateRectRgn(0, 0, 0, 0);
   if (paintRgn != nullptr) {
     int result = GetRandomRgn(aDC, paintRgn, SYSRGN);
     if (result == 1) {
       POINT pt = {0,0};
       ::MapWindowPoints(nullptr, mWnd, &pt, 1);
       ::OffsetRgn(paintRgn, pt.x, pt.y);
     }
     nsIntRegion rgn(WinUtils::ConvertHRGNToRegion(paintRgn));
     ::DeleteObject(paintRgn);
     return rgn;
   }
   return nsIntRegion(WinUtils::ToIntRect(ps.rcPaint));
 }
 #define WORDSSIZE(x) ((x).width * (x).height)
 static bool
 EnsureSharedSurfaceSize(gfxIntSize size)
 {
   gfxIntSize screenSize;
   screenSize.height = GetSystemMetrics(SM_CYSCREEN);
   screenSize.width = GetSystemMetrics(SM_CXSCREEN);
   if (WORDSSIZE(screenSize) > WORDSSIZE(size))
     size = screenSize;
   if (WORDSSIZE(screenSize) < WORDSSIZE(size))
     NS_WARNING("Trying to create a shared surface larger than the screen");
   if (!sSharedSurfaceData || (WORDSSIZE(size) > WORDSSIZE(sSharedSurfaceSize))) {
     sSharedSurfaceSize = size;
     sSharedSurfaceData = nullptr;
     sSharedSurfaceData = (uint8_t *)malloc(WORDSSIZE(sSharedSurfaceSize) * 4);
   }
   return (sSharedSurfaceData != nullptr);
 }
 nsIWidgetListener* nsWindow::GetPaintListener()
 {
   if (mDestroyCalled)
     return nullptr;
   return mAttachedWidgetListener ? mAttachedWidgetListener : mWidgetListener;
 }
 bool nsWindow::OnPaint(HDC aDC, uint32_t aNestingLevel)
 {
   // We never have reentrant paint events, except when we're running our RPC
   // windows event spin loop. If we don't trap for this, we'll try to paint,
   // but view manager will refuse to paint the surface, resulting is black
   // flashes on the plugin rendering surface.
   if (mozilla::ipc::MessageChannel::IsSpinLoopActive() && mPainting)
     return false;
   if (mWindowType == eWindowType_plugin) {
     /**
      * After we CallUpdateWindow to the child, occasionally a WM_PAINT message
      * is posted to the parent event loop with an empty update rect. Do a
      * dummy paint so that Windows stops dispatching WM_PAINT in an inifinite
      * loop. See bug 543788.
      */
     RECT updateRect;
     if (!GetUpdateRect(mWnd, &updateRect, FALSE) ||
         (updateRect.left == updateRect.right &&
          updateRect.top == updateRect.bottom)) {
       PAINTSTRUCT ps;
       BeginPaint(mWnd, &ps);
       EndPaint(mWnd, &ps);
       return true;
     }
     PluginInstanceParent* instance = reinterpret_cast<PluginInstanceParent*>(
       ::GetPropW(mWnd, L"PluginInstanceParentProperty"));
     if (instance) {
       unused << instance->CallUpdateWindow();
     } else {
       // We should never get here since in-process plugins should have
       // subclassed our HWND and handled WM_PAINT, but in some cases that
       // could fail. Return without asserting since it's not our fault.
       NS_WARNING("Plugin failed to subclass our window");
     }
     ValidateRect(mWnd, nullptr);
     return true;
   }
   ClientLayerManager *clientLayerManager =
       (GetLayerManager()->GetBackendType() == LayersBackend::LAYERS_CLIENT)
       ? static_cast<ClientLayerManager*>(GetLayerManager())
       : nullptr;
   if (clientLayerManager && mCompositorParent &&
       !mBounds.IsEqualEdges(mLastPaintBounds))
   {
     // Do an early async composite so that we at least have something on the
     // screen in the right place, even if the content is out of date.
     mCompositorParent->ScheduleRenderOnCompositorThread();
   }
   mLastPaintBounds = mBounds;
   PAINTSTRUCT ps;
 #ifdef MOZ_XUL
   if (!aDC && (eTransparencyTransparent == mTransparencyMode))
   {
     // For layered translucent windows all drawing should go to memory DC and no
     // WM_PAINT messages are normally generated. To support asynchronous painting
     // we force generation of WM_PAINT messages by invalidating window areas with
     // RedrawWindow, InvalidateRect or InvalidateRgn function calls.
     // BeginPaint/EndPaint must be called to make Windows think that invalid area
     // is painted. Otherwise it will continue sending the same message endlessly.
     ::BeginPaint(mWnd, &ps);
     ::EndPaint(mWnd, &ps);
     aDC = mMemoryDC;
   }
 #endif
   mPainting = true;
 #ifdef WIDGET_DEBUG_OUTPUT
   HRGN debugPaintFlashRegion = nullptr;
   HDC debugPaintFlashDC = nullptr;
   if (debug_WantPaintFlashing())
   {
     debugPaintFlashRegion = ::CreateRectRgn(0, 0, 0, 0);
     ::GetUpdateRgn(mWnd, debugPaintFlashRegion, TRUE);
     debugPaintFlashDC = ::GetDC(mWnd);
   }
 #endif // WIDGET_DEBUG_OUTPUT
   HDC hDC = aDC ? aDC : (::BeginPaint(mWnd, &ps));
   mPaintDC = hDC;
 #ifdef MOZ_XUL
   bool forceRepaint = aDC || (eTransparencyTransparent == mTransparencyMode);
 #else
   bool forceRepaint = nullptr != aDC;
 #endif
   nsIntRegion region = GetRegionToPaint(forceRepaint, ps, hDC);
   if (clientLayerManager && mCompositorParent) {
     // We need to paint to the screen even if nothing changed, since if we
     // don't have a compositing window manager, our pixels could be stale.
     clientLayerManager->SetNeedsComposite(true);
     clientLayerManager->SendInvalidRegion(region);
   }
   nsIWidgetListener* listener = GetPaintListener();
   if (listener) {
     listener->WillPaintWindow(this);
   }
   // Re-get the listener since the will paint notification may have killed it.
   listener = GetPaintListener();
   if (!listener) {
     return false;
   }
   if (clientLayerManager && mCompositorParent && clientLayerManager->NeedsComposite()) {
     mCompositorParent->ScheduleRenderOnCompositorThread();
     clientLayerManager->SetNeedsComposite(false);
   }
   bool result = true;
   if (!region.IsEmpty() && listener)
   {
     // Should probably pass in a real region here, using GetRandomRgn
     // http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/clipping_4q0e.asp
 #ifdef WIDGET_DEBUG_OUTPUT
     debug_DumpPaintEvent(stdout,
                          this,
                          region,
                          nsAutoCString("noname"),
                          (int32_t) mWnd);
 #endif // WIDGET_DEBUG_OUTPUT
     switch (GetLayerManager()->GetBackendType()) {
       case LayersBackend::LAYERS_BASIC:
         {
           nsRefPtr<gfxASurface> targetSurface;
 #if defined(MOZ_XUL)
           // don't support transparency for non-GDI rendering, for now
           if ((IsRenderMode(gfxWindowsPlatform::RENDER_GDI) ||
                IsRenderMode(gfxWindowsPlatform::RENDER_DIRECT2D)) &&
               eTransparencyTransparent == mTransparencyMode) {
             if (mTransparentSurface == nullptr)
               SetupTranslucentWindowMemoryBitmap(mTransparencyMode);
             targetSurface = mTransparentSurface;
           }
 #endif
           nsRefPtr<gfxWindowsSurface> targetSurfaceWin;
           if (!targetSurface &&
               (IsRenderMode(gfxWindowsPlatform::RENDER_GDI) ||
                IsRenderMode(gfxWindowsPlatform::RENDER_DIRECT2D)))
           {
             uint32_t flags = (mTransparencyMode == eTransparencyOpaque) ? 0 :
                 gfxWindowsSurface::FLAG_IS_TRANSPARENT;
             targetSurfaceWin = new gfxWindowsSurface(hDC, flags);
             targetSurface = targetSurfaceWin;
           }
           nsRefPtr<gfxImageSurface> targetSurfaceImage;
           if (!targetSurface &&
               (IsRenderMode(gfxWindowsPlatform::RENDER_IMAGE_STRETCH32) ||
                IsRenderMode(gfxWindowsPlatform::RENDER_IMAGE_STRETCH24)))
           {
             gfxIntSize surfaceSize(ps.rcPaint.right - ps.rcPaint.left,
                                    ps.rcPaint.bottom - ps.rcPaint.top);
             if (!EnsureSharedSurfaceSize(surfaceSize)) {
               NS_ERROR("Couldn't allocate a shared image surface!");
               return false;
             }
             // don't use the shared surface directly; instead, create a new one
             // that just reuses its buffer.
             targetSurfaceImage = new gfxImageSurface(sSharedSurfaceData.get(),
                                                      surfaceSize,
                                                      surfaceSize.width * 4,
                                                      gfxImageFormat::RGB24);
             if (targetSurfaceImage && !targetSurfaceImage->CairoStatus()) {
               targetSurfaceImage->SetDeviceOffset(gfxPoint(-ps.rcPaint.left, -ps.rcPaint.top));
               targetSurface = targetSurfaceImage;
             }
           }
           if (!targetSurface) {
             NS_ERROR("Invalid RenderMode!");
             return false;
           }
           nsRefPtr<gfxContext> thebesContext;
           if (gfxPlatform::GetPlatform()->SupportsAzureContentForType(mozilla::gfx::BackendType::CAIRO)) {
             RECT paintRect;
             ::GetClientRect(mWnd, &paintRect);
             RefPtr<mozilla::gfx::DrawTarget> dt =
               gfxPlatform::GetPlatform()->CreateDrawTargetForSurface(targetSurface,
                                                                      mozilla::gfx::IntSize(paintRect.right - paintRect.left,
                                                                                            paintRect.bottom - paintRect.top));
             thebesContext = new gfxContext(dt);
           } else {
             thebesContext = new gfxContext(targetSurface);
           }
           // don't need to double buffer with anything but GDI
           BufferMode doubleBuffering = mozilla::layers::BufferMode::BUFFER_NONE;
           if (IsRenderMode(gfxWindowsPlatform::RENDER_GDI) ||
               IsRenderMode(gfxWindowsPlatform::RENDER_DIRECT2D)) {
 #ifdef MOZ_XUL
             switch (mTransparencyMode) {
               case eTransparencyGlass:
               case eTransparencyBorderlessGlass:
               default:
                 // If we're not doing translucency, then double buffer
                 doubleBuffering = mozilla::layers::BufferMode::BUFFERED;
                 break;
               case eTransparencyTransparent:
                 // If we're rendering with translucency, we're going to be
                 // rendering the whole window; make sure we clear it first
                 thebesContext->SetOperator(gfxContext::OPERATOR_CLEAR);
                 thebesContext->Paint();
                 thebesContext->SetOperator(gfxContext::OPERATOR_OVER);
                 break;
             }
 #else
             doubleBuffering = mozilla::layers::BufferMode::BUFFERED;
 #endif
           }
           {
             AutoLayerManagerSetup
                 setupLayerManager(this, thebesContext, doubleBuffering);
             result = listener->PaintWindow(this, region);
           }
 #ifdef MOZ_XUL
           if ((IsRenderMode(gfxWindowsPlatform::RENDER_GDI) ||
                IsRenderMode(gfxWindowsPlatform::RENDER_DIRECT2D))&&
               eTransparencyTransparent == mTransparencyMode) {
             // Data from offscreen drawing surface was copied to memory bitmap of transparent
             // bitmap. Now it can be read from memory bitmap to apply alpha channel and after
             // that displayed on the screen.
             UpdateTranslucentWindow();
           } else
 #endif
           if (result) {
             if (IsRenderMode(gfxWindowsPlatform::RENDER_IMAGE_STRETCH24) ||
                 IsRenderMode(gfxWindowsPlatform::RENDER_IMAGE_STRETCH32))
             {
               gfxIntSize surfaceSize = targetSurfaceImage->GetSize();
               // Just blit this directly
               BITMAPINFOHEADER bi;
               memset(&bi, 0, sizeof(BITMAPINFOHEADER));
               bi.biSize = sizeof(BITMAPINFOHEADER);
               bi.biWidth = surfaceSize.width;
               bi.biHeight = - surfaceSize.height;
               bi.biPlanes = 1;
               bi.biBitCount = 32;
               bi.biCompression = BI_RGB;
               if (IsRenderMode(gfxWindowsPlatform::RENDER_IMAGE_STRETCH24)) {
                 // On Windows CE/Windows Mobile, 24bpp packed-pixel sources
                 // seem to be far faster to blit than 32bpp (see bug 484864).
                 // So, convert the bits to 24bpp by stripping out the unused
                 // alpha byte.  24bpp DIBs also have scanlines that are 4-byte
                 // aligned though, so that must be taken into account.
                 int srcstride = surfaceSize.width*4;
                 int dststride = surfaceSize.width*3;
                 dststride = (dststride + 3) & ~3;
                 // Convert in place
                 for (int j = 0; j < surfaceSize.height; ++j) {
                   unsigned int *src = (unsigned int*) (targetSurfaceImage->Data() + j*srcstride);
                   unsigned int *dst = (unsigned int*) (targetSurfaceImage->Data() + j*dststride);
                   // go 4 pixels at a time, since each 4 pixels
                   // turns into 3 DWORDs when converted into BGR:
                   // BGRx BGRx BGRx BGRx -> BGRB GRBG RBGR
                   //
                   // However, since we're dealing with little-endian ints, this is actually:
                   // xRGB xrgb xRGB xrgb -> bRGB GBrg rgbR
                   int width_left = surfaceSize.width;
                   while (width_left >= 4) {
                     unsigned int a = *src++;
                     unsigned int b = *src++;
                     unsigned int c = *src++;
                     unsigned int d = *src++;
                     *dst++ =  (a & 0x00ffffff)        | (b << 24);
                     *dst++ = ((b & 0x00ffff00) >> 8)  | (c << 16);
                     *dst++ = ((c & 0x00ff0000) >> 16) | (d << 8);
                     width_left -= 4;
                   }
                   // then finish up whatever number of pixels are left,
                   // using bytes.
                   unsigned char *bsrc = (unsigned char*) src;
                   unsigned char *bdst = (unsigned char*) dst;
                   switch (width_left) {
                     case 3:
                       *bdst++ = *bsrc++;
                       *bdst++ = *bsrc++;
                       *bdst++ = *bsrc++;
                       bsrc++;
                     case 2:
                       *bdst++ = *bsrc++;
                       *bdst++ = *bsrc++;
                       *bdst++ = *bsrc++;
                       bsrc++;
                     case 1:
                       *bdst++ = *bsrc++;
                       *bdst++ = *bsrc++;
                       *bdst++ = *bsrc++;
                       bsrc++;
                     case 0:
                       break;
                   }
                 }
                 bi.biBitCount = 24;
               }
               StretchDIBits(hDC,
                             ps.rcPaint.left, ps.rcPaint.top,
                             surfaceSize.width, surfaceSize.height,
 , 0,
                             surfaceSize.width, surfaceSize.height,
                             targetSurfaceImage->Data(),
                             (BITMAPINFO*) &bi,
                             DIB_RGB_COLORS,
                             SRCCOPY);
             }
           }
         }
         break;
 #ifdef MOZ_ENABLE_D3D9_LAYER
       case LayersBackend::LAYERS_D3D9:
         {
           nsRefPtr<LayerManagerD3D9> layerManagerD3D9 =
             static_cast<mozilla::layers::LayerManagerD3D9*>(GetLayerManager());
           layerManagerD3D9->SetClippingRegion(region);
           result = listener->PaintWindow(this, region);
           if (layerManagerD3D9->DeviceWasRemoved()) {
             mLayerManager->Destroy();
             mLayerManager = nullptr;
             // When our device was removed, we should have gfxWindowsPlatform
             // check if its render mode is up to date!
             gfxWindowsPlatform::GetPlatform()->UpdateRenderMode();
             Invalidate();
           }
         }
         break;
 #endif
 #ifdef MOZ_ENABLE_D3D10_LAYER
       case LayersBackend::LAYERS_D3D10:
         {
           gfxWindowsPlatform::GetPlatform()->UpdateRenderMode();
           LayerManagerD3D10 *layerManagerD3D10 = static_cast<mozilla::layers::LayerManagerD3D10*>(GetLayerManager());
           if (layerManagerD3D10->device() != gfxWindowsPlatform::GetPlatform()->GetD3D10Device()) {
             Invalidate();
           } else {
             result = listener->PaintWindow(this, region);
           }
         }
         break;
 #endif
       case LayersBackend::LAYERS_CLIENT:
         result = listener->PaintWindow(this, region);
         break;
       default:
         NS_ERROR("Unknown layers backend used!");
         break;
     }
   }
   if (!aDC) {
     ::EndPaint(mWnd, &ps);
   }
   mPaintDC = nullptr;
   mLastPaintEndTime = TimeStamp::Now();
 #if defined(WIDGET_DEBUG_OUTPUT)
   if (debug_WantPaintFlashing())
   {
     // Only flash paint events which have not ignored the paint message.
     // Those that ignore the paint message aren't painting anything so there
     // is only the overhead of the dispatching the paint event.
     if (result) {
       ::InvertRgn(debugPaintFlashDC, debugPaintFlashRegion);
       PR_Sleep(PR_MillisecondsToInterval(30));
       ::InvertRgn(debugPaintFlashDC, debugPaintFlashRegion);
       PR_Sleep(PR_MillisecondsToInterval(30));
     }
     ::ReleaseDC(mWnd, debugPaintFlashDC);
     ::DeleteObject(debugPaintFlashRegion);
   }
 #endif // WIDGET_DEBUG_OUTPUT
   mPainting = false;
   // Re-get the listener since painting may have killed it.
   listener = GetPaintListener();
   if (listener)
     listener->DidPaintWindow();
   if (aNestingLevel == 0 && ::GetUpdateRect(mWnd, nullptr, false)) {
     OnPaint(aDC, 1);
   }
   return result;
 }
 gfxIntSize nsWindowGfx::GetIconMetrics(IconSizeType aSizeType) {
   int32_t width = ::GetSystemMetrics(sIconMetrics[aSizeType].xMetric);
   int32_t height = ::GetSystemMetrics(sIconMetrics[aSizeType].yMetric);
   if (width == 0 || height == 0) {
     width = height = sIconMetrics[aSizeType].defaultSize;
   }
   return gfxIntSize(width, height);
 }
 nsresult nsWindowGfx::CreateIcon(imgIContainer *aContainer,
                                   bool aIsCursor,
                                   uint32_t aHotspotX,
                                   uint32_t aHotspotY,
                                   gfxIntSize aScaledSize,
                                   HICON *aIcon) {
   MOZ_ASSERT((aScaledSize.width > 0 && aScaledSize.height > 0) ||
              (aScaledSize.width == 0 && aScaledSize.height == 0));
   // Get the image data
   RefPtr<SourceSurface> surface =
     aContainer->GetFrame(imgIContainer::FRAME_CURRENT,
                          imgIContainer::FLAG_SYNC_DECODE);
   NS_ENSURE_TRUE(surface, NS_ERROR_NOT_AVAILABLE);
   IntSize frameSize = surface->GetSize();
   if (frameSize.IsEmpty()) {
     return NS_ERROR_FAILURE;
   }
   IntSize iconSize(aScaledSize.width, aScaledSize.height);
   if (iconSize == IntSize(0, 0)) { // use frame's intrinsic size
     iconSize = frameSize;
   }
   RefPtr<DataSourceSurface> dataSurface;
   bool mappedOK;
   DataSourceSurface::MappedSurface map;
   if (iconSize != frameSize) {
     // Scale the surface
     dataSurface = Factory::CreateDataSourceSurface(iconSize,
                                                    SurfaceFormat::B8G8R8A8);
     NS_ENSURE_TRUE(dataSurface, NS_ERROR_FAILURE);
     mappedOK = dataSurface->Map(DataSourceSurface::MapType::READ_WRITE, &map);
     NS_ENSURE_TRUE(mappedOK, NS_ERROR_FAILURE);
     RefPtr<DrawTarget> dt =
       Factory::CreateDrawTargetForData(BackendType::CAIRO,
                                        map.mData,
                                        dataSurface->GetSize(),
                                        map.mStride,
                                        SurfaceFormat::B8G8R8A8);
     dt->DrawSurface(surface,
                     Rect(0, 0, iconSize.width, iconSize.height),
                     Rect(0, 0, frameSize.width, frameSize.height),
                     DrawSurfaceOptions(),
                     DrawOptions(1.0f, CompositionOp::OP_SOURCE));
   } else if (surface->GetFormat() != SurfaceFormat::B8G8R8A8) {
     // Convert format to SurfaceFormat::B8G8R8A8
     dataSurface = gfxUtils::
       CopySurfaceToDataSourceSurfaceWithFormat(surface,
                                                SurfaceFormat::B8G8R8A8);
     NS_ENSURE_TRUE(dataSurface, NS_ERROR_FAILURE);
     mappedOK = dataSurface->Map(DataSourceSurface::MapType::READ, &map);
   } else {
     dataSurface = surface->GetDataSurface();
     NS_ENSURE_TRUE(dataSurface, NS_ERROR_FAILURE);
     mappedOK = dataSurface->Map(DataSourceSurface::MapType::READ, &map);
   }
   NS_ENSURE_TRUE(dataSurface && mappedOK, NS_ERROR_FAILURE);
   MOZ_ASSERT(dataSurface->GetFormat() == SurfaceFormat::B8G8R8A8);
   uint8_t* data = nullptr;
   nsAutoArrayPtr<uint8_t> autoDeleteArray;
   if (map.mStride == BytesPerPixel(dataSurface->GetFormat()) * iconSize.width) {
     // Mapped data is already packed
     data = map.mData;
   } else {
     // We can't use map.mData since the pixels are not packed (as required by
     // CreateDIBitmap, which is called under the DataToBitmap call below).
     //
     // We must unmap before calling SurfaceToPackedBGRA because it needs access
     // to the pixel data.
     dataSurface->Unmap();
     map.mData = nullptr;
     data = autoDeleteArray = SurfaceToPackedBGRA(dataSurface);
     NS_ENSURE_TRUE(data, NS_ERROR_FAILURE);
   }
   HBITMAP bmp = DataToBitmap(data, iconSize.width, -iconSize.height, 32);
   uint8_t* a1data = Data32BitTo1Bit(data, iconSize.width, iconSize.height);
   if (map.mData) {
     dataSurface->Unmap();
   }
   if (!a1data) {
     return NS_ERROR_FAILURE;
   }
   HBITMAP mbmp = DataToBitmap(a1data, iconSize.width, -iconSize.height, 1);
   PR_Free(a1data);
   ICONINFO info = {0};
   info.fIcon = !aIsCursor;
   info.xHotspot = aHotspotX;
   info.yHotspot = aHotspotY;
   info.hbmMask = mbmp;
   info.hbmColor = bmp;
   HCURSOR icon = ::CreateIconIndirect(&info);
   ::DeleteObject(mbmp);
   ::DeleteObject(bmp);
   if (!icon)
     return NS_ERROR_FAILURE;
   *aIcon = icon;
   return NS_OK;
 }
 // Adjust cursor image data
 uint8_t* nsWindowGfx::Data32BitTo1Bit(uint8_t* aImageData,
                                       uint32_t aWidth, uint32_t aHeight)
 {
   // We need (aWidth + 7) / 8 bytes plus zero-padding up to a multiple of
   // 4 bytes for each row (HBITMAP requirement). Bug 353553.
   uint32_t outBpr = ((aWidth + 31) / 8) & ~3;
   // Allocate and clear mask buffer
   uint8_t* outData = (uint8_t*)PR_Calloc(outBpr, aHeight);
   if (!outData)
     return nullptr;
   int32_t *imageRow = (int32_t*)aImageData;
   for (uint32_t curRow = 0; curRow < aHeight; curRow++) {
     uint8_t *outRow = outData + curRow * outBpr;
     uint8_t mask = 0x80;
     for (uint32_t curCol = 0; curCol < aWidth; curCol++) {
       // Use sign bit to test for transparency, as alpha byte is highest byte
       if (*imageRow++ < 0)
         *outRow |= mask;
       mask >>= 1;
       if (!mask) {
         outRow ++;
         mask = 0x80;
       }
     }
   }
   return outData;
 }
 /**
  * Convert the given image data to a HBITMAP. If the requested depth is
  * 32 bit, a bitmap with an alpha channel will be returned.
  *
  * @param aImageData The image data to convert. Must use the format accepted
  *                   by CreateDIBitmap.
  * @param aWidth     With of the bitmap, in pixels.
  * @param aHeight    Height of the image, in pixels.
  * @param aDepth     Image depth, in bits. Should be one of 1, 24 and 32.
  *
  * @return The HBITMAP representing the image. Caller should call
  *         DeleteObject when done with the bitmap.
  *         On failure, nullptr will be returned.
  */
 HBITMAP nsWindowGfx::DataToBitmap(uint8_t* aImageData,
                                   uint32_t aWidth,
                                   uint32_t aHeight,
                                   uint32_t aDepth)
 {
   HDC dc = ::GetDC(nullptr);
   if (aDepth == 32) {
     // Alpha channel. We need the new header.
     BITMAPV4HEADER head = { 0 };
     head.bV4Size = sizeof(head);
     head.bV4Width = aWidth;
     head.bV4Height = aHeight;
     head.bV4Planes = 1;
     head.bV4BitCount = aDepth;
     head.bV4V4Compression = BI_BITFIELDS;
     head.bV4SizeImage = 0; // Uncompressed
     head.bV4XPelsPerMeter = 0;
     head.bV4YPelsPerMeter = 0;
     head.bV4ClrUsed = 0;
     head.bV4ClrImportant = 0;
     head.bV4RedMask   = 0x00FF0000;
     head.bV4GreenMask = 0x0000FF00;
     head.bV4BlueMask  = 0x000000FF;
     head.bV4AlphaMask = 0xFF000000;
     HBITMAP bmp = ::CreateDIBitmap(dc,
                                    reinterpret_cast<CONST BITMAPINFOHEADER*>(&head),
                                    CBM_INIT,
                                    aImageData,
                                    reinterpret_cast<CONST BITMAPINFO*>(&head),
                                    DIB_RGB_COLORS);
     ::ReleaseDC(nullptr, dc);
     return bmp;
   }
   char reserved_space[sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * 2];
   BITMAPINFOHEADER& head = *(BITMAPINFOHEADER*)reserved_space;
   head.biSize = sizeof(BITMAPINFOHEADER);
   head.biWidth = aWidth;
   head.biHeight = aHeight;
   head.biPlanes = 1;
   head.biBitCount = (WORD)aDepth;
   head.biCompression = BI_RGB;
   head.biSizeImage = 0; // Uncompressed
   head.biXPelsPerMeter = 0;
   head.biYPelsPerMeter = 0;
   head.biClrUsed = 0;
   head.biClrImportant = 0;
   BITMAPINFO& bi = *(BITMAPINFO*)reserved_space;
   if (aDepth == 1) {
     RGBQUAD black = { 0, 0, 0, 0 };
     RGBQUAD white = { 255, 255, 255, 0 };
     bi.bmiColors[0] = white;
     bi.bmiColors[1] = black;
   }
   HBITMAP bmp = ::CreateDIBitmap(dc, &head, CBM_INIT, aImageData, &bi, DIB_RGB_COLORS);
   ::ReleaseDC(nullptr, dc);
   return bmp;
 }

The Tor Browser / annotate

widget/windows/nsWindowGfx.cpp@ac0c01689b40 (annotated)

widget/windows/nsWindowGfx.cpp