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fune/widget/windows/nsWindowGfx.cpp
David Parks bc3fe641ef Bug 642851: Clear autohidden taskbar region on Windows 10+ if drawing NC region r=cmartin 
The unpainted non-client region leaves a white bar at the bottom of the window when maximized on Win11 with auto-hidden taskbar.  This region is where a user can mouse-over to expose the taskbar.  Painting it black eliminates the row of white pixels and fixes problems with exposing the hidden taskbar.  Windows 10 usually (correctly) paints a sliver of the taskbar in this region with or without this patch.  However, it also has similar (but more complex) failing edge cases discussed in the bug.

Additionally, bug 758280 used 1px for the autohidden region size but the real size is 2px so we switch to that here.

Differential Revision: https://phabricator.services.mozilla.com/D148834
2023-04-24 23:11:15 +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 "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(HDC aDC, 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();
// 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() && knowsCompositor && knowsCompositor->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 (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;
if (!aDC && (renderer->GetBackendType() == LayersBackend::LAYERS_NONE) &&
(TransparencyMode::Transparent == 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();
}
HDC hDC = aDC ? aDC : (::BeginPaint(mWnd, &ps));
mPaintDC = hDC;
bool forceRepaint =
aDC || (TransparencyMode::Transparent == mTransparencyMode);
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
// 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 (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::BorderlessGlass:
default:
// If we're not doing translucency, then double buffer
doubleBuffering = mozilla::layers::BufferMode::BUFFERED;
break;
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;
}
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() &&
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();
// 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;
}
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.bits = 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.bits = 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.bits = 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
// 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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