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fune/widget/windows/nsWindowGfx.cpp
Andrew Osmond 45b5262f91 Bug 1632698 - Better handle device resets when we don't have a GPU process. r=sotaro,kvark,nical 
Aside from on Windows, we do not appear to handle device resets properly
without the GPU process. This patch adds in the necessary plumbing to
handle the device reset properly. It also ensures that whenever we check
for a device reset reason, we handle all of the reasons (e.g. not just
the NV video memory purge reset reason) to ensure they are not lost, and
handles them all consistently in the same manner.

It also tracks the number of device resets for thresholding purposes
with an in process compositor. While it will only disable WebRender on
Linux at this time, it will put a note in the critical log if the
threshold was exceeded on all platforms. This may prove useful in
evaluating whether or not we should do the same everywhere.

Differential Revision: https://phabricator.services.mozilla.com/D98705
2020-12-07 20:36:11 +00:00

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/* -*- 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.
*/
/**************************************************************
**************************************************************
**
** BLOCK: Includes
**
** Include headers.
**
**************************************************************
**************************************************************/
#include "mozilla/dom/ContentParent.h"
#include "mozilla/plugins/PluginInstanceParent.h"
using mozilla::plugins::PluginInstanceParent;
#include "nsWindowGfx.h"
#include "nsAppRunner.h"
#include <windows.h>
#include "gfxEnv.h"
#include "gfxImageSurface.h"
#include "gfxUtils.h"
#include "gfxWindowsSurface.h"
#include "gfxWindowsPlatform.h"
#include "gfxDWriteFonts.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/DataSurfaceHelpers.h"
#include "mozilla/gfx/Tools.h"
#include "mozilla/RefPtr.h"
#include "mozilla/UniquePtrExtensions.h"
#include "nsGfxCIID.h"
#include "gfxContext.h"
#include "WinUtils.h"
#include "nsIWidgetListener.h"
#include "mozilla/Unused.h"
#include "nsDebug.h"
#include "mozilla/gfx/GPUProcessManager.h"
#include "mozilla/layers/CompositorBridgeParent.h"
#include "mozilla/layers/CompositorBridgeChild.h"
#include "ClientLayerManager.h"
#include "InProcessWinCompositorWidget.h"
#include "nsUXThemeData.h"
#include "nsUXThemeConstants.h"
using namespace mozilla;
using namespace mozilla::gfx;
using namespace mozilla::layers;
using namespace mozilla::widget;
using namespace mozilla::plugins;
/**************************************************************
**************************************************************
**
** BLOCK: Variables
**
** nsWindow Class static initializations and global variables.
**
**************************************************************
**************************************************************/
/**************************************************************
*
* SECTION: nsWindow statics
*
**************************************************************/
static UniquePtr<uint8_t[]> sSharedSurfaceData;
static IntSize 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: nsWindow impl.
**
** Paint related nsWindow methods.
**
**************************************************************
**************************************************************/
// GetRegionToPaint returns the invalidated region that needs to be painted
LayoutDeviceIntRegion nsWindow::GetRegionToPaint(bool aForceFullRepaint,
PAINTSTRUCT ps, HDC aDC) {
if (aForceFullRepaint) {
RECT paintRect;
::GetClientRect(mWnd, &paintRect);
return LayoutDeviceIntRegion(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);
}
LayoutDeviceIntRegion rgn(WinUtils::ConvertHRGNToRegion(paintRgn));
::DeleteObject(paintRgn);
return rgn;
}
return LayoutDeviceIntRegion(WinUtils::ToIntRect(ps.rcPaint));
}
nsIWidgetListener* nsWindow::GetPaintListener() {
if (mDestroyCalled) return nullptr;
return mAttachedWidgetListener ? mAttachedWidgetListener : mWidgetListener;
}
void nsWindow::ForcePresent() {
if (mResizeState != RESIZING) {
if (CompositorBridgeChild* remoteRenderer = GetRemoteRenderer()) {
remoteRenderer->SendForcePresent();
}
}
}
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;
DeviceResetReason resetReason = DeviceResetReason::OK;
if (gfxWindowsPlatform::GetPlatform()->DidRenderingDeviceReset(
&resetReason)) {
gfxCriticalNote << "(nsWindow) Detected device reset: " << (int)resetReason;
gfxWindowsPlatform::GetPlatform()->UpdateRenderMode();
bool guilty;
switch (resetReason) {
case DeviceResetReason::HUNG:
case DeviceResetReason::RESET:
case DeviceResetReason::INVALID_CALL:
guilty = true;
break;
default:
guilty = false;
break;
}
GPUProcessManager::Get()->OnInProcessDeviceReset(guilty);
gfxCriticalNote << "(nsWindow) Finished device reset.";
return false;
}
// 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.
if (IsPlugin()) {
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;
}
if (mWindowType == eWindowType_plugin_ipc_chrome) {
// Fire off an async request to the plugin to paint its window
mozilla::dom::ContentParent::SendAsyncUpdate(this);
ValidateRect(mWnd, nullptr);
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;
}
PAINTSTRUCT ps;
// Avoid starting the GPU process for the initial navigator:blank window.
if (mIsEarlyBlankWindow) {
// Call BeginPaint/EndPaint or Windows will keep sending us messages.
::BeginPaint(mWnd, &ps);
::EndPaint(mWnd, &ps);
return true;
}
// Clear window by transparent black when compositor window is used in GPU
// process and non-client area rendering by DWM is enabled.
// It is for showing non-client area rendering. See nsWindow::UpdateGlass().
if (HasGlass() && GetLayerManager()->AsKnowsCompositor() &&
GetLayerManager()->AsKnowsCompositor()->GetUseCompositorWnd()) {
HDC hdc;
RECT rect;
hdc = ::GetWindowDC(mWnd);
::GetWindowRect(mWnd, &rect);
::MapWindowPoints(nullptr, mWnd, (LPPOINT)&rect, 2);
::FillRect(hdc, &rect,
reinterpret_cast<HBRUSH>(GetStockObject(BLACK_BRUSH)));
ReleaseDC(mWnd, hdc);
}
if (GetLayerManager()->AsKnowsCompositor() &&
!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.
GetLayerManager()->ScheduleComposite();
}
mLastPaintBounds = mBounds;
#ifdef MOZ_XUL
if (!aDC &&
(GetLayerManager()->GetBackendType() == LayersBackend::LAYERS_BASIC) &&
(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);
// We're guaranteed to have a widget proxy since we called
// GetLayerManager().
aDC = mBasicLayersSurface->GetTransparentDC();
}
#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
LayoutDeviceIntRegion region = GetRegionToPaint(forceRepaint, ps, hDC);
if (GetLayerManager()->AsKnowsCompositor()) {
// 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.
GetLayerManager()->SetNeedsComposite(true);
GetLayerManager()->SendInvalidRegion(region.ToUnknownRegion());
}
RefPtr<nsWindow> strongThis(this);
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 (GetLayerManager()->AsKnowsCompositor() &&
GetLayerManager()->NeedsComposite()) {
GetLayerManager()->ScheduleComposite();
GetLayerManager()->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.ToUnknownRegion(), "noname",
(int32_t)mWnd);
#endif // WIDGET_DEBUG_OUTPUT
switch (GetLayerManager()->GetBackendType()) {
case LayersBackend::LAYERS_BASIC: {
RefPtr<gfxASurface> targetSurface;
#if defined(MOZ_XUL)
// don't support transparency for non-GDI rendering, for now
if (eTransparencyTransparent == mTransparencyMode) {
// This mutex needs to be held when EnsureTransparentSurface is
// called.
MutexAutoLock lock(mBasicLayersSurface->GetTransparentSurfaceLock());
targetSurface = mBasicLayersSurface->EnsureTransparentSurface();
}
#endif
RefPtr<gfxWindowsSurface> targetSurfaceWin;
if (!targetSurface) {
uint32_t flags = (mTransparencyMode == eTransparencyOpaque)
? 0
: gfxWindowsSurface::FLAG_IS_TRANSPARENT;
targetSurfaceWin = new gfxWindowsSurface(hDC, flags);
targetSurface = targetSurfaceWin;
}
if (!targetSurface) {
NS_ERROR("Invalid RenderMode!");
return false;
}
RECT paintRect;
::GetClientRect(mWnd, &paintRect);
RefPtr<DrawTarget> dt = gfxPlatform::CreateDrawTargetForSurface(
targetSurface, IntSize(paintRect.right - paintRect.left,
paintRect.bottom - paintRect.top));
if (!dt || !dt->IsValid()) {
gfxWarning()
<< "nsWindow::OnPaint failed in CreateDrawTargetForSurface";
return false;
}
// don't need to double buffer with anything but GDI
BufferMode doubleBuffering = mozilla::layers::BufferMode::BUFFER_NONE;
#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
dt->ClearRect(
Rect(0.f, 0.f, dt->GetSize().width, dt->GetSize().height));
break;
}
#else
doubleBuffering = mozilla::layers::BufferMode::BUFFERED;
#endif
RefPtr<gfxContext> thebesContext = gfxContext::CreateOrNull(dt);
MOZ_ASSERT(thebesContext); // already checked draw target above
{
AutoLayerManagerSetup setupLayerManager(this, thebesContext,
doubleBuffering);
result = listener->PaintWindow(this, region);
}
#ifdef MOZ_XUL
if (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.
mBasicLayersSurface->RedrawTransparentWindow();
}
#endif
} break;
case LayersBackend::LAYERS_CLIENT:
case LayersBackend::LAYERS_WR: {
result = listener->PaintWindow(this, region);
if (!gfxEnv::DisableForcePresent() &&
gfxWindowsPlatform::GetPlatform()->DwmCompositionEnabled()) {
nsCOMPtr<nsIRunnable> event = NewRunnableMethod(
"nsWindow::ForcePresent", this, &nsWindow::ForcePresent);
NS_DispatchToMainThread(event);
}
} 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;
}
// This override of CreateCompositor is to add support for sending the IPC
// call for RequesetFxrOutput as soon as the compositor for this widget is
// available.
void nsWindow::CreateCompositor() {
nsWindowBase::CreateCompositor();
if (mRequestFxrOutputPending) {
GetRemoteRenderer()->SendRequestFxrOutput();
}
}
void nsWindow::RequestFxrOutput() {
if (GetRemoteRenderer() != nullptr) {
MOZ_CRASH("RequestFxrOutput should happen before Compositor is created.");
} else {
// The compositor isn't ready, so indicate to make the IPC call when
// it is available.
mRequestFxrOutputPending = true;
}
}
LayoutDeviceIntSize 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 LayoutDeviceIntSize(width, height);
}
nsresult nsWindowGfx::CreateIcon(imgIContainer* aContainer, bool aIsCursor,
LayoutDeviceIntPoint aHotspot,
LayoutDeviceIntSize aScaledSize,
HICON* aIcon) {
MOZ_ASSERT(aHotspot.x >= 0 && aHotspot.y >= 0);
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 | imgIContainer::FLAG_ASYNC_NOTIFY);
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);
if (!dt) {
gfxWarning()
<< "nsWindowGfx::CreatesIcon failed in CreateDrawTargetForData";
return NS_ERROR_OUT_OF_MEMORY;
}
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;
UniquePtr<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;
autoDeleteArray = SurfaceToPackedBGRA(dataSurface);
data = autoDeleteArray.get();
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);
free(a1data);
ICONINFO info = {0};
info.fIcon = !aIsCursor;
info.xHotspot = aHotspot.x;
info.yHotspot = aHotspot.y;
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*)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;
}
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