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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
/*
* nsWindowGfx - Painting and aceleration.
*/
/**************************************************************
**************************************************************
**
** BLOCK: Includes
**
** Include headers.
**
**************************************************************
**************************************************************/
#include "mozilla/dom/ContentParent.h"
#include "nsWindowGfx.h"
#include "nsAppRunner.h"
#include <windows.h>
#include <shellapi.h>
#include "gfxEnv.h"
#include "gfxImageSurface.h"
#include "gfxUtils.h"
#include "gfxConfig.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 "WinWindowOcclusionTracker.h"
#include "nsIWidgetListener.h"
#include "mozilla/Unused.h"
#include "nsDebug.h"
#include "WindowRenderer.h"
#include "mozilla/layers/WebRenderLayerManager.h"
#include "mozilla/gfx/GPUProcessManager.h"
#include "mozilla/layers/CompositorBridgeParent.h"
#include "mozilla/layers/CompositorBridgeChild.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;
extern mozilla::LazyLogModule gWindowsLog;
/**************************************************************
**************************************************************
**
** BLOCK: Variables
**
** nsWindow Class static initializations and global variables.
**
**************************************************************
**************************************************************/
/**************************************************************
*
* SECTION: nsWindow statics
*
**************************************************************/
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(wr::RenderReasons::WIDGET);
}
}
}
bool nsWindow::OnPaint(uint32_t aNestingLevel) {
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;
}
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;
}
WindowRenderer* renderer = GetWindowRenderer();
KnowsCompositor* knowsCompositor = renderer->AsKnowsCompositor();
WebRenderLayerManager* layerManager = renderer->AsWebRender();
if (mClearNCEdge) {
// We need to clear this edge of the non-client region to black (once).
HDC hdc;
RECT rect;
hdc = ::GetWindowDC(mWnd);
::GetWindowRect(mWnd, &rect);
::MapWindowPoints(nullptr, mWnd, (LPPOINT)&rect, 2);
switch (mClearNCEdge.value()) {
case ABE_TOP:
rect.bottom = rect.top + kHiddenTaskbarSize;
break;
case ABE_LEFT:
rect.right = rect.left + kHiddenTaskbarSize;
break;
case ABE_BOTTOM:
rect.top = rect.bottom - kHiddenTaskbarSize;
break;
case ABE_RIGHT:
rect.left = rect.right - kHiddenTaskbarSize;
break;
default:
MOZ_ASSERT_UNREACHABLE("Invalid edge value");
break;
}
::FillRect(hdc, &rect,
reinterpret_cast<HBRUSH>(::GetStockObject(BLACK_BRUSH)));
::ReleaseDC(mWnd, hdc);
mClearNCEdge.reset();
}
if (knowsCompositor && layerManager &&
!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.
layerManager->ScheduleComposite(wr::RenderReasons::WIDGET);
}
mLastPaintBounds = mBounds;
// 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.
const bool usingMemoryDC =
renderer->GetBackendType() == LayersBackend::LAYERS_NONE &&
mTransparencyMode == TransparencyMode::Transparent;
HDC hDC = nullptr;
if (usingMemoryDC) {
// 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().
hDC = mBasicLayersSurface->GetTransparentDC();
} else {
hDC = ::BeginPaint(mWnd, &ps);
}
const bool forceRepaint = mTransparencyMode == TransparencyMode::Transparent;
const LayoutDeviceIntRegion region = GetRegionToPaint(forceRepaint, ps, hDC);
if (knowsCompositor && layerManager) {
// 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.
layerManager->SetNeedsComposite(true);
layerManager->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 (knowsCompositor && layerManager && layerManager->NeedsComposite()) {
layerManager->ScheduleComposite(wr::RenderReasons::WIDGET);
layerManager->SetNeedsComposite(false);
}
bool result = true;
if (!region.IsEmpty() && listener) {
// Should probably pass in a real region here, using GetRandomRgn
#ifdef WIDGET_DEBUG_OUTPUT
debug_DumpPaintEvent(stdout, this, region.ToUnknownRegion(), "noname",
(int32_t)mWnd);
#endif // WIDGET_DEBUG_OUTPUT
switch (renderer->GetBackendType()) {
case LayersBackend::LAYERS_NONE: {
RefPtr<gfxASurface> targetSurface;
// don't support transparency for non-GDI rendering, for now
if (TransparencyMode::Transparent == mTransparencyMode) {
// This mutex needs to be held when EnsureTransparentSurface is
// called.
MutexAutoLock lock(mBasicLayersSurface->GetTransparentSurfaceLock());
targetSurface = mBasicLayersSurface->EnsureTransparentSurface();
}
RefPtr<gfxWindowsSurface> targetSurfaceWin;
if (!targetSurface) {
uint32_t flags = (mTransparencyMode == TransparencyMode::Opaque)
? 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;
switch (mTransparencyMode) {
case TransparencyMode::Transparent:
// 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;
default:
// If we're not doing translucency, then double buffer
doubleBuffering = mozilla::layers::BufferMode::BUFFERED;
break;
}
gfxContext thebesContext(dt);
{
AutoLayerManagerSetup setupLayerManager(this, &thebesContext,
doubleBuffering);
result = listener->PaintWindow(this, region);
}
if (TransparencyMode::Transparent == 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();
}
} break;
case LayersBackend::LAYERS_WR: {
result = listener->PaintWindow(this, region);
if (!gfxEnv::MOZ_DISABLE_FORCE_PRESENT()) {
nsCOMPtr<nsIRunnable> event = NewRunnableMethod(
"nsWindow::ForcePresent", this, &nsWindow::ForcePresent);
NS_DispatchToMainThread(event);
}
} break;
default:
NS_ERROR("Unknown layers backend used!");
break;
}
}
if (!usingMemoryDC) {
::EndPaint(mWnd, &ps);
}
mLastPaintEndTime = TimeStamp::Now();
// Re-get the listener since painting may have killed it.
listener = GetPaintListener();
if (listener) listener->DidPaintWindow();
if (aNestingLevel == 0 && ::GetUpdateRect(mWnd, nullptr, false)) {
OnPaint(1);
}
return result;
}
bool nsWindow::NeedsToTrackWindowOcclusionState() {
if (!WinWindowOcclusionTracker::Get()) {
return false;
}
if (mCompositorSession && mWindowType == WindowType::TopLevel) {
return true;
}
return false;
}
void nsWindow::NotifyOcclusionState(mozilla::widget::OcclusionState aState) {
MOZ_ASSERT(NeedsToTrackWindowOcclusionState());
bool isFullyOccluded = aState == mozilla::widget::OcclusionState::OCCLUDED;
// When window is minimized, it is not set as fully occluded.
if (mFrameState->GetSizeMode() == nsSizeMode_Minimized) {
isFullyOccluded = false;
}
// Don't dispatch if the new occlustion state is the same as the current
// state.
if (mIsFullyOccluded == isFullyOccluded) {
return;
}
mIsFullyOccluded = isFullyOccluded;
MOZ_LOG(gWindowsLog, LogLevel::Info,
("nsWindow::NotifyOcclusionState() mIsFullyOccluded %d "
"mFrameState->GetSizeMode() %d",
mIsFullyOccluded, mFrameState->GetSizeMode()));
wr::DebugFlags flags{0};
flags._0 = gfx::gfxVars::WebRenderDebugFlags();
bool debugEnabled = bool(flags & wr::DebugFlags::WINDOW_VISIBILITY_DBG);
if (debugEnabled && mCompositorWidgetDelegate) {
mCompositorWidgetDelegate->NotifyVisibilityUpdated(
mFrameState->GetSizeMode(), mIsFullyOccluded);
}
if (mWidgetListener) {
mWidgetListener->OcclusionStateChanged(mIsFullyOccluded);
}
}
void nsWindow::MaybeEnableWindowOcclusion(bool aEnable) {
// WindowOcclusion is enabled/disabled only when compositor session exists.
// See nsWindow::NeedsToTrackWindowOcclusionState().
if (!mCompositorSession) {
return;
}
bool enabled = gfxConfig::IsEnabled(gfx::Feature::WINDOW_OCCLUSION);
if (aEnable) {
// Enable window occlusion.
if (enabled && NeedsToTrackWindowOcclusionState()) {
WinWindowOcclusionTracker::Get()->Enable(this, mWnd);
wr::DebugFlags flags{0};
flags._0 = gfx::gfxVars::WebRenderDebugFlags();
bool debugEnabled = bool(flags & wr::DebugFlags::WINDOW_VISIBILITY_DBG);
if (debugEnabled && mCompositorWidgetDelegate) {
mCompositorWidgetDelegate->NotifyVisibilityUpdated(
mFrameState->GetSizeMode(), mIsFullyOccluded);
}
}
return;
}
// Disable window occlusion.
MOZ_ASSERT(!aEnable);
if (!NeedsToTrackWindowOcclusionState()) {
return;
}
WinWindowOcclusionTracker::Get()->Disable(this, mWnd);
NotifyOcclusionState(OcclusionState::VISIBLE);
wr::DebugFlags flags{0};
flags._0 = gfx::gfxVars::WebRenderDebugFlags();
bool debugEnabled = bool(flags & wr::DebugFlags::WINDOW_VISIBILITY_DBG);
if (debugEnabled && mCompositorWidgetDelegate) {
mCompositorWidgetDelegate->NotifyVisibilityUpdated(
mFrameState->GetSizeMode(), mIsFullyOccluded);
}
}
// 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() {
nsBaseWidget::CreateCompositor();
MaybeEnableWindowOcclusion(/* aEnable */ true);
if (mRequestFxrOutputPending) {
GetRemoteRenderer()->SendRequestFxrOutput();
}
}
void nsWindow::DestroyCompositor() {
MaybeEnableWindowOcclusion(/* aEnable */ false);
nsBaseWidget::DestroyCompositor();
}
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
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;
}