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gecko/widget/windows/nsWindowGfx.cpp

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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.
*/
// 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 "gfxWindowsSurface.h"
#include "gfxWindowsPlatform.h"
#include "nsGfxCIID.h"
#include "gfxContext.h"
#include "nsRenderingContext.h"
#include "prmem.h"
#include "WinUtils.h"
#include "nsIWidgetListener.h"
#include "mozilla/unused.h"
#include "LayerManagerOGL.h"
#include "BasicLayers.h"
#ifdef MOZ_ENABLE_D3D9_LAYER
#include "LayerManagerD3D9.h"
#endif
#ifdef MOZ_ENABLE_D3D10_LAYER
#include "LayerManagerD3D10.h"
#endif
#include "nsUXThemeData.h"
#include "nsUXThemeConstants.h"
extern "C" {
#define PIXMAN_DONT_DEFINE_STDINT
#include "pixman.h"
}
using namespace mozilla;
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
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 != NULL) {
int result = GetRandomRgn(aDC, paintRgn, SYSRGN);
if (result == 1) {
POINT pt = {0,0};
::MapWindowPoints(NULL, 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::RPCChannel::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, NULL);
return true;
}
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;
bool result = true;
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 = NULL;
HDC debugPaintFlashDC = NULL;
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));
if (!IsRenderMode(gfxWindowsPlatform::RENDER_DIRECT2D)) {
mPaintDC = hDC;
}
#ifdef MOZ_XUL
bool forceRepaint = aDC || (eTransparencyTransparent == mTransparencyMode);
#else
bool forceRepaint = NULL != aDC;
#endif
nsIntRegion region = GetRegionToPaint(forceRepaint, ps, hDC);
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 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
#ifdef CAIRO_HAS_D2D_SURFACE
if (!targetSurface &&
IsRenderMode(gfxWindowsPlatform::RENDER_DIRECT2D))
{
if (!mD2DWindowSurface) {
gfxASurface::gfxContentType content = gfxASurface::CONTENT_COLOR;
#if defined(MOZ_XUL)
if (mTransparencyMode != eTransparencyOpaque) {
content = gfxASurface::CONTENT_COLOR_ALPHA;
}
#endif
mD2DWindowSurface = new gfxD2DSurface(mWnd, content);
}
if (!mD2DWindowSurface->CairoStatus()) {
targetSurface = mD2DWindowSurface;
} else {
mD2DWindowSurface = nullptr;
}
}
#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,
gfxASurface::ImageFormatRGB24);
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 = new gfxContext(targetSurface);
if (IsRenderMode(gfxWindowsPlatform::RENDER_DIRECT2D)) {
const nsIntRect* r;
for (nsIntRegionRectIterator iter(region);
(r = iter.Next()) != nullptr;) {
thebesContext->Rectangle(gfxRect(r->x, r->y, r->width, r->height), true);
}
thebesContext->Clip();
thebesContext->SetOperator(gfxContext::OPERATOR_CLEAR);
thebesContext->Paint();
thebesContext->SetOperator(gfxContext::OPERATOR_OVER);
}
// don't need to double buffer with anything but GDI
BufferMode doubleBuffering = mozilla::layers::BUFFER_NONE;
if (IsRenderMode(gfxWindowsPlatform::RENDER_GDI)) {
#ifdef MOZ_XUL
switch (mTransparencyMode) {
case eTransparencyGlass:
case eTransparencyBorderlessGlass:
default:
// If we're not doing translucency, then double buffer
doubleBuffering = mozilla::layers::BUFFER_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::BUFFER_BUFFERED;
#endif
}
{
AutoLayerManagerSetup
setupLayerManager(this, thebesContext, doubleBuffering);
result = listener->PaintWindow(this, region, 0);
}
#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
#ifdef CAIRO_HAS_D2D_SURFACE
if (result) {
if (mD2DWindowSurface) {
mD2DWindowSurface->Present();
}
}
#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, 0,
surfaceSize.width, surfaceSize.height,
targetSurfaceImage->Data(),
(BITMAPINFO*) &bi,
DIB_RGB_COLORS,
SRCCOPY);
}
}
}
break;
case LAYERS_OPENGL:
static_cast<mozilla::layers::LayerManagerOGL*>(GetLayerManager())->
SetClippingRegion(region);
result = listener->PaintWindow(this, region, 0);
break;
#ifdef MOZ_ENABLE_D3D9_LAYER
case LAYERS_D3D9:
{
nsRefPtr<LayerManagerD3D9> layerManagerD3D9 =
static_cast<mozilla::layers::LayerManagerD3D9*>(GetLayerManager());
layerManagerD3D9->SetClippingRegion(region);
result = listener->PaintWindow(this, region, 0);
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 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, 0);
}
}
break;
#endif
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, NULL, 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) {
// Get the image data
nsRefPtr<gfxImageSurface> frame;
aContainer->CopyFrame(imgIContainer::FRAME_CURRENT,
imgIContainer::FLAG_SYNC_DECODE,
getter_AddRefs(frame));
if (!frame)
return NS_ERROR_NOT_AVAILABLE;
int32_t width = frame->Width();
int32_t height = frame->Height();
if (!width || !height)
return NS_ERROR_FAILURE;
uint8_t *data;
if ((aScaledSize.width == 0 && aScaledSize.height == 0) ||
(aScaledSize.width == width && aScaledSize.height == height)) {
// We're not scaling the image. The data is simply what's in the frame.
data = frame->Data();
}
else {
NS_ENSURE_ARG(aScaledSize.width > 0);
NS_ENSURE_ARG(aScaledSize.height > 0);
// Draw a scaled version of the image to a temporary surface
nsRefPtr<gfxImageSurface> dest = new gfxImageSurface(aScaledSize,
gfxASurface::ImageFormatARGB32);
if (!dest)
return NS_ERROR_OUT_OF_MEMORY;
gfxContext ctx(dest);
// Set scaling
gfxFloat sw = (double) aScaledSize.width / width;
gfxFloat sh = (double) aScaledSize.height / height;
ctx.Scale(sw, sh);
// Paint a scaled image
ctx.SetOperator(gfxContext::OPERATOR_SOURCE);
ctx.SetSource(frame);
ctx.Paint();
data = dest->Data();
width = aScaledSize.width;
height = aScaledSize.height;
}
HBITMAP bmp = DataToBitmap(data, width, -height, 32);
uint8_t* a1data = Data32BitTo1Bit(data, width, height);
if (!a1data) {
return NS_ERROR_FAILURE;
}
HBITMAP mbmp = DataToBitmap(a1data, width, -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 NULL;
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, NULL will be returned.
*/
HBITMAP nsWindowGfx::DataToBitmap(uint8_t* aImageData,
uint32_t aWidth,
uint32_t aHeight,
uint32_t aDepth)
{
HDC dc = ::GetDC(NULL);
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(NULL, 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(NULL, dc);
return bmp;
}
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