bitmaps.c File Reference

#include <win32k.h>
#include <debug.h>

Include dependency graph for bitmaps.c:

Go to the source code of this file.

Macros
#define	NDEBUG

Functions
BOOL NTAPI	GreSetBitmapOwner (_In_ HBITMAP hbmp, _In_ ULONG ulOwner)
LONG NTAPI	UnsafeSetBitmapBits (_Inout_ PSURFACE psurf, _In_ ULONG cjBits, _In_ const VOID *pvBits)
HBITMAP NTAPI	GreCreateBitmapEx (_In_ ULONG nWidth, _In_ ULONG nHeight, _In_ ULONG cjWidthBytes, _In_ ULONG iFormat, _In_ USHORT fjBitmap, _In_ ULONG cjSizeImage, _In_opt_ PVOID pvBits, _In_ FLONG flags)
HBITMAP NTAPI	GreCreateBitmap (_In_ ULONG nWidth, _In_ ULONG nHeight, _In_ ULONG cPlanes, _In_ ULONG cBitsPixel, _In_opt_ PVOID pvBits)
HBITMAP APIENTRY	NtGdiCreateBitmap (IN INT nWidth, IN INT nHeight, IN UINT cPlanes, IN UINT cBitsPixel, IN OPTIONAL LPBYTE pUnsafeBits)
HBITMAP FASTCALL	IntCreateCompatibleBitmap (PDC Dc, INT Width, INT Height, UINT Planes, UINT Bpp)
HBITMAP APIENTRY	NtGdiCreateCompatibleBitmap (HDC hDC, INT Width, INT Height)
BOOL NTAPI	GreGetBitmapDimension (_In_ HBITMAP hBitmap, _Out_ LPSIZE psizDim)
BOOL APIENTRY	NtGdiGetBitmapDimension (HBITMAP hBitmap, LPSIZE psizDim)
LONG FASTCALL	UnsafeGetBitmapBits (PSURFACE psurf, DWORD Bytes, OUT PBYTE pvBits)
LONG APIENTRY	NtGdiGetBitmapBits (HBITMAP hBitmap, ULONG cjBuffer, OUT OPTIONAL PBYTE pUnsafeBits)
LONG APIENTRY	NtGdiSetBitmapBits (HBITMAP hBitmap, DWORD Bytes, IN PBYTE pUnsafeBits)
BOOL APIENTRY	NtGdiSetBitmapDimension (HBITMAP hBitmap, INT Width, INT Height, LPSIZE Size)
HBITMAP FASTCALL	BITMAP_CopyBitmap (HBITMAP hBitmap)
INT APIENTRY	BITMAP_GetObject (SURFACE *psurf, INT Count, LPVOID buffer)
HDC APIENTRY	NtGdiGetDCforBitmap (IN HBITMAP hsurf)

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 12 of file bitmaps.c.

Function Documentation

BITMAP_CopyBitmap()

HBITMAP FASTCALL BITMAP_CopyBitmap

(

HBITMAP

hBitmap

)

Definition at line 709 of file bitmaps.c.

{
    HBITMAP hbmNew;
    SURFACE *psurfSrc, *psurfNew;

    /* Fail, if no source bitmap is given */
    if (hBitmap == NULL) return 0;

    /* Lock the source bitmap */
    psurfSrc = SURFACE_ShareLockSurface(hBitmap);
    if (psurfSrc == NULL)
    {
        return 0;
    }

    /* Allocate a new bitmap with the same dimensions as the source bmp */
    hbmNew = GreCreateBitmapEx(psurfSrc->SurfObj.sizlBitmap.cx,
                               psurfSrc->SurfObj.sizlBitmap.cy,
                               abs(psurfSrc->SurfObj.lDelta),
                               psurfSrc->SurfObj.iBitmapFormat,
                               psurfSrc->SurfObj.fjBitmap & BMF_TOPDOWN,
                               psurfSrc->SurfObj.cjBits,
                               NULL,
                               psurfSrc->flags);

    if (hbmNew)
    {
        /* Lock the new bitmap */
        psurfNew = SURFACE_ShareLockSurface(hbmNew);
        if (psurfNew)
        {
            /* Copy the bitmap bits to the new bitmap buffer */
            RtlCopyMemory(psurfNew->SurfObj.pvBits,
                          psurfSrc->SurfObj.pvBits,
                          psurfNew->SurfObj.cjBits);


            /* Reference the palette of the source bitmap and use it */
            SURFACE_vSetPalette(psurfNew, psurfSrc->ppal);

            /* Unlock the new surface */
            SURFACE_ShareUnlockSurface(psurfNew);
        }
        else
        {
            /* Failed to lock the bitmap, shouldn't happen */
            GreDeleteObject(hbmNew);
            hbmNew = NULL;
        }
    }

    /* Unlock the source bitmap and return the handle of the new bitmap */
    SURFACE_ShareUnlockSurface(psurfSrc);
    return hbmNew;
}

Referenced by _Success_(), and NtGdiCreatePatternBrushInternal().

BITMAP_GetObject()

INT APIENTRY BITMAP_GetObject	(	SURFACE *	psurf,
		INT	Count,
		LPVOID	buffer
	)

Definition at line 766 of file bitmaps.c.

{
    PBITMAP pBitmap;

    if (!buffer) return sizeof(BITMAP);
    if ((UINT)Count < sizeof(BITMAP)) return 0;

    /* Always fill a basic BITMAP structure */
    pBitmap = buffer;
    pBitmap->bmType = 0;
    pBitmap->bmWidth = psurf->SurfObj.sizlBitmap.cx;
    pBitmap->bmHeight = psurf->SurfObj.sizlBitmap.cy;
    pBitmap->bmPlanes = 1;
    pBitmap->bmBitsPixel = BitsPerFormat(psurf->SurfObj.iBitmapFormat);
    pBitmap->bmWidthBytes = WIDTH_BYTES_ALIGN16(pBitmap->bmWidth, pBitmap->bmBitsPixel);

    /* Check for DIB section */
    if (psurf->hSecure)
    {
        /* Set bmBits in this case */
        pBitmap->bmBits = psurf->SurfObj.pvBits;
        /* DIBs data are 32 bits aligned */
        pBitmap->bmWidthBytes = WIDTH_BYTES_ALIGN32(pBitmap->bmWidth, pBitmap->bmBitsPixel);

        if (Count >= sizeof(DIBSECTION))
        {
            /* Fill rest of DIBSECTION */
            PDIBSECTION pds = buffer;

            pds->dsBmih.biSize = sizeof(BITMAPINFOHEADER);
            pds->dsBmih.biWidth = pds->dsBm.bmWidth;
            pds->dsBmih.biHeight = pds->dsBm.bmHeight;
            pds->dsBmih.biPlanes = pds->dsBm.bmPlanes;
            pds->dsBmih.biBitCount = pds->dsBm.bmBitsPixel;

            switch (psurf->SurfObj.iBitmapFormat)
            {
                case BMF_1BPP:
                case BMF_4BPP:
                case BMF_8BPP:
                   pds->dsBmih.biCompression = BI_RGB;
                   break;

                case BMF_16BPP:
                    if (psurf->ppal->flFlags & PAL_RGB16_555)
                        pds->dsBmih.biCompression = BI_RGB;
                    else
                        pds->dsBmih.biCompression = BI_BITFIELDS;
                    break;

                case BMF_24BPP:
                case BMF_32BPP:
                    /* 24/32bpp BI_RGB is actually BGR format */
                    if (psurf->ppal->flFlags & PAL_BGR)
                        pds->dsBmih.biCompression = BI_RGB;
                    else
                        pds->dsBmih.biCompression = BI_BITFIELDS;
                    break;

                case BMF_4RLE:
                   pds->dsBmih.biCompression = BI_RLE4;
                   break;
                case BMF_8RLE:
                   pds->dsBmih.biCompression = BI_RLE8;
                   break;
                case BMF_JPEG:
                   pds->dsBmih.biCompression = BI_JPEG;
                   break;
                case BMF_PNG:
                   pds->dsBmih.biCompression = BI_PNG;
                   break;
                default:
                    ASSERT(FALSE); /* This shouldn't happen */
            }

            pds->dsBmih.biSizeImage = psurf->SurfObj.cjBits;
            pds->dsBmih.biXPelsPerMeter = 0;
            pds->dsBmih.biYPelsPerMeter = 0;
            pds->dsBmih.biClrUsed = psurf->ppal->NumColors;
            pds->dsBmih.biClrImportant = psurf->biClrImportant;
            pds->dsBitfields[0] = psurf->ppal->RedMask;
            pds->dsBitfields[1] = psurf->ppal->GreenMask;
            pds->dsBitfields[2] = psurf->ppal->BlueMask;
            pds->dshSection = psurf->hDIBSection;
            pds->dsOffset = psurf->dwOffset;

            return sizeof(DIBSECTION);
        }
    }
    else
    {
        /* Not set according to wine test, confirmed in win2k */
        pBitmap->bmBits = NULL;
    }

    return sizeof(BITMAP);
}

Referenced by GreGetObject(), and IntCreateCompatibleBitmap().

GreCreateBitmap()

HBITMAP NTAPI GreCreateBitmap	(	_In_ ULONG	nWidth,
		_In_ ULONG	nHeight,
		_In_ ULONG	cPlanes,
		_In_ ULONG	cBitsPixel,
		_In_opt_ PVOID	pvBits
	)

Definition at line 172 of file bitmaps.c.

{
    /* Call the extended function */
    return GreCreateBitmapEx(nWidth,
                             nHeight,
                             0, /* Auto width */
                             BitmapFormat(cBitsPixel * cPlanes, BI_RGB),
                             0, /* No bitmap flags */
                             0, /* Auto size */
                             pvBits,
                             DDB_SURFACE /* DDB */);
}

Referenced by CreateStockObjects(), IntCreateCompatibleBitmap(), IntCreateDIBitmap(), NtGdiCreateCompatibleBitmap(), and UserInitialize().

GreCreateBitmapEx()

HBITMAP NTAPI GreCreateBitmapEx	(	_In_ ULONG	nWidth,
		_In_ ULONG	nHeight,
		_In_ ULONG	cjWidthBytes,
		_In_ ULONG	iFormat,
		_In_ USHORT	fjBitmap,
		_In_ ULONG	cjSizeImage,
		_In_opt_ PVOID	pvBits,
		_In_ FLONG	flags
	)

Definition at line 101 of file bitmaps.c.

{
    PSURFACE psurf;
    HBITMAP hbmp;
    PVOID pvCompressedBits = NULL;

    /* Verify format */
    if (iFormat < BMF_1BPP || iFormat > BMF_PNG) return NULL;

    /* The infamous RLE hack */
    if ((iFormat == BMF_4RLE) || (iFormat == BMF_8RLE))
    {
        pvCompressedBits = pvBits;
        pvBits = NULL;
        iFormat = (iFormat == BMF_4RLE) ? BMF_4BPP : BMF_8BPP;
    }

    /* Allocate a surface */
    psurf = SURFACE_AllocSurface(STYPE_BITMAP,
                                 nWidth,
                                 nHeight,
                                 iFormat,
                                 fjBitmap,
                                 cjWidthBytes,
                                 pvCompressedBits ? 0 : cjSizeImage,
                                 pvBits);
    if (!psurf)
    {
        DPRINT1("SURFACE_AllocSurface failed.\n");
        return NULL;
    }

    /* The infamous RLE hack */
    if (pvCompressedBits)
    {
        SIZEL sizl;
        LONG lDelta;

        sizl.cx = nWidth;
        sizl.cy = nHeight;
        lDelta = WIDTH_BYTES_ALIGN32(nWidth, gajBitsPerFormat[iFormat]);

        pvBits = psurf->SurfObj.pvBits;
        DecompressBitmap(sizl, pvCompressedBits, pvBits, lDelta, iFormat, cjSizeImage);
    }

    /* Get the handle for the bitmap */
    hbmp = (HBITMAP)psurf->SurfObj.hsurf;

    /* Mark as API bitmap */
    psurf->flags |= (flags | API_BITMAP);

    /* Unlock the surface and return */
    SURFACE_UnlockSurface(psurf);
    return hbmp;
}

Referenced by BITMAP_CopyBitmap(), DIB_CreateDIBSection(), GreCreateBitmap(), IntGdiCreateMaskFromRLE(), IntSetDIBits(), NtGdiSetDIBitsToDeviceInternal(), and NtGdiStretchDIBitsInternal().

GreGetBitmapDimension()

BOOL NTAPI GreGetBitmapDimension	(	_In_ HBITMAP	hBitmap,
		_Out_ LPSIZE	psizDim
	)

Definition at line 448 of file bitmaps.c.

{
    PSURFACE psurfBmp;

    if (hBitmap == NULL)
        return FALSE;

    /* Lock the bitmap */
    psurfBmp = SURFACE_ShareLockSurface(hBitmap);
    if (psurfBmp == NULL)
    {
        EngSetLastError(ERROR_INVALID_HANDLE);
        return FALSE;
    }

    *psizDim = psurfBmp->sizlDim;

    /* Unlock the bitmap */
    SURFACE_ShareUnlockSurface(psurfBmp);

    return TRUE;
}

Referenced by co_IntDrawCaret(), and NtGdiGetBitmapDimension().

GreSetBitmapOwner()

BOOL NTAPI GreSetBitmapOwner	(	_In_ HBITMAP	hbmp,
		_In_ ULONG	ulOwner
	)

FIXME: this is a hack and doesn't handle a race condition properly. It needs to be done in GDIOBJ_vSetObjectOwner atomically.

Definition at line 17 of file bitmaps.c.

{
    /* Check if we have the correct object type */
    if (GDI_HANDLE_GET_TYPE(hbmp) != GDILoObjType_LO_BITMAP_TYPE)
    {
        DPRINT1("Incorrect type for hbmp: %p\n", hbmp);
        return FALSE;
    }


    /* Check if we set public or none */
    if ((ulOwner == GDI_OBJ_HMGR_PUBLIC) ||
        (ulOwner == GDI_OBJ_HMGR_NONE))
    {
        /* Only allow this for owned objects */
        if (GreGetObjectOwner(hbmp) != GDI_OBJ_HMGR_POWNED)
        {
            DPRINT1("Cannot change owner for non-powned hbmp\n");
            return FALSE;
        }
    }

    return GreSetObjectOwner(hbmp, ulOwner);
}

Referenced by CreateBrushInternal(), IntGdiCreatePatternBrush(), IntSetCursorData(), and BRUSH::~BRUSH().

IntCreateCompatibleBitmap()

HBITMAP FASTCALL IntCreateCompatibleBitmap	(	PDC	Dc,
		INT	Width,
		INT	Height,
		UINT	Planes,
		UINT	Bpp
	)

Definition at line 273 of file bitmaps.c.

{
    HBITMAP Bmp = NULL;
    PPALETTE ppal;

    /* MS doc says if width or height is 0, return 1-by-1 pixel, monochrome bitmap */
    if (0 == Width || 0 == Height)
    {
        return NtGdiGetStockObject(DEFAULT_BITMAP);
    }

    if (Dc->dctype != DC_TYPE_MEMORY)
    {
        PSURFACE psurf;

        Bmp = GreCreateBitmap(abs(Width),
                              abs(Height),
                              Planes ? Planes : 1,
                              Bpp ? Bpp : Dc->ppdev->gdiinfo.cBitsPixel,
                              NULL);
        if (Bmp == NULL)
        {
            DPRINT1("Failed to allocate a bitmap!\n");
            return NULL;
        }

        psurf = SURFACE_ShareLockSurface(Bmp);
        ASSERT(psurf);

        /* Dereference old palette and set new palette */
        ppal = PALETTE_ShareLockPalette(Dc->ppdev->devinfo.hpalDefault);
        ASSERT(ppal);
        SURFACE_vSetPalette(psurf, ppal);
        PALETTE_ShareUnlockPalette(ppal);

        /* Set flags */
        psurf->flags = API_BITMAP;
        psurf->hdc = NULL; // FIXME:
        psurf->SurfObj.hdev = (HDEV)Dc->ppdev;
        SURFACE_ShareUnlockSurface(psurf);
    }
    else
    {
        DIBSECTION dibs;
        INT Count;
        PSURFACE psurf = Dc->dclevel.pSurface;
        if(!psurf) psurf = psurfDefaultBitmap;
        Count = BITMAP_GetObject(psurf, sizeof(dibs), &dibs);

        if (Count == sizeof(BITMAP))
        {
            PSURFACE psurfBmp;

            Bmp = GreCreateBitmap(abs(Width),
                          abs(Height),
                          Planes ? Planes : 1,
                          Bpp ? Bpp : dibs.dsBm.bmBitsPixel,
                          NULL);
            psurfBmp = SURFACE_ShareLockSurface(Bmp);
            ASSERT(psurfBmp);

            /* Dereference old palette and set new palette */
            SURFACE_vSetPalette(psurfBmp, psurf->ppal);

            /* Set flags */
            psurfBmp->flags = API_BITMAP;
            psurfBmp->hdc = NULL; // FIXME:
            psurf->SurfObj.hdev = (HDEV)Dc->ppdev;
            SURFACE_ShareUnlockSurface(psurfBmp);
        }
        else if (Count == sizeof(DIBSECTION))
        {
            /* A DIB section is selected in the DC */
            BYTE buf[sizeof(BITMAPINFOHEADER) + 256*sizeof(RGBQUAD)] = {0};
            PVOID Bits;
            BITMAPINFO* bi = (BITMAPINFO*)buf;

            bi->bmiHeader.biSize          = sizeof(bi->bmiHeader);
            bi->bmiHeader.biWidth         = Width;
            bi->bmiHeader.biHeight        = Height;
            bi->bmiHeader.biPlanes        = Planes ? Planes : dibs.dsBmih.biPlanes;
            bi->bmiHeader.biBitCount      = Bpp ? Bpp : dibs.dsBmih.biBitCount;
            bi->bmiHeader.biCompression   = dibs.dsBmih.biCompression;
            bi->bmiHeader.biSizeImage     = 0;
            bi->bmiHeader.biXPelsPerMeter = dibs.dsBmih.biXPelsPerMeter;
            bi->bmiHeader.biYPelsPerMeter = dibs.dsBmih.biYPelsPerMeter;
            bi->bmiHeader.biClrUsed       = dibs.dsBmih.biClrUsed;
            bi->bmiHeader.biClrImportant  = dibs.dsBmih.biClrImportant;

            if (bi->bmiHeader.biCompression == BI_BITFIELDS)
            {
                /* Copy the color masks */
                RtlCopyMemory(bi->bmiColors, dibs.dsBitfields, 3*sizeof(RGBQUAD));
            }
            else if (bi->bmiHeader.biBitCount <= 8)
            {
                /* Copy the color table */
                UINT Index;
                PPALETTE PalGDI;

                if (!psurf->ppal)
                {
                    EngSetLastError(ERROR_INVALID_HANDLE);
                    return 0;
                }

                PalGDI = psurf->ppal;

                for (Index = 0;
                        Index < 256 && Index < PalGDI->NumColors;
                        Index++)
                {
                    bi->bmiColors[Index].rgbRed   = PalGDI->IndexedColors[Index].peRed;
                    bi->bmiColors[Index].rgbGreen = PalGDI->IndexedColors[Index].peGreen;
                    bi->bmiColors[Index].rgbBlue  = PalGDI->IndexedColors[Index].peBlue;
                    bi->bmiColors[Index].rgbReserved = 0;
                }
            }

            Bmp = DIB_CreateDIBSection(Dc,
                                       bi,
                                       DIB_RGB_COLORS,
                                       &Bits,
                                       NULL,
                                       0,
                                       0);
            return Bmp;
        }
    }
    return Bmp;
}

Referenced by IntCreateDIBitmap(), and NtGdiCreateCompatibleBitmap().

NtGdiCreateBitmap()

HBITMAP APIENTRY NtGdiCreateBitmap	(	IN INT	nWidth,
		IN INT	nHeight,
		IN UINT	cPlanes,
		IN UINT	cBitsPixel,
		IN OPTIONAL LPBYTE	pUnsafeBits
	)

Definition at line 192 of file bitmaps.c.

{
    HBITMAP hbmp;
    ULONG cRealBpp, cjWidthBytes, iFormat;
    ULONGLONG cjSize;
    PSURFACE psurf;

    /* Calculate bitmap format and real bits per pixel. */
    iFormat = BitmapFormat(cBitsPixel * cPlanes, BI_RGB);
    cRealBpp = gajBitsPerFormat[iFormat];

    /* Calculate width and image size in bytes */
    cjWidthBytes = WIDTH_BYTES_ALIGN16(nWidth, cRealBpp);
    cjSize = (ULONGLONG)cjWidthBytes * nHeight;

    /* Check parameters (possible overflow of cjSize!) */
    if ((iFormat == 0) || (nWidth <= 0) || (nWidth >= 0x8000000) || (nHeight <= 0) ||
        (cBitsPixel > 32) || (cPlanes > 32) || (cjSize >= 0x100000000ULL))
    {
        DPRINT1("Invalid bitmap format! Width=%d, Height=%d, Bpp=%u, Planes=%u\n",
                nWidth, nHeight, cBitsPixel, cPlanes);
        EngSetLastError(ERROR_INVALID_PARAMETER);
        return NULL;
    }

    /* Allocate the surface (but don't set the bits) */
    psurf = SURFACE_AllocSurface(STYPE_BITMAP,
                                 nWidth,
                                 nHeight,
                                 iFormat,
                                 0,
                                 0,
                                 0,
                                 NULL);
    if (!psurf)
    {
        DPRINT1("SURFACE_AllocSurface failed.\n");
        return NULL;
    }

    /* Mark as API and DDB bitmap */
    psurf->flags |= (API_BITMAP | DDB_SURFACE);

    /* Check if we have bits to set */
    if (pUnsafeBits)
    {
        /* Protect with SEH and copy the bits */
        _SEH2_TRY
        {
            ProbeForRead(pUnsafeBits, (SIZE_T)cjSize, 1);
            UnsafeSetBitmapBits(psurf, cjSize, pUnsafeBits);
        }
        _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
        {
            GDIOBJ_vDeleteObject(&psurf->BaseObject);
            _SEH2_YIELD(return NULL;)
        }
        _SEH2_END
    }
    else
    {
        /* Zero the bits */
        RtlZeroMemory(psurf->SurfObj.pvBits, psurf->SurfObj.cjBits);
    }

    /* Get the handle for the bitmap */
    hbmp = (HBITMAP)psurf->SurfObj.hsurf;

    /* Unlock the surface */
    SURFACE_UnlockSurface(psurf);

    return hbmp;
}

NtGdiCreateCompatibleBitmap()

HBITMAP APIENTRY NtGdiCreateCompatibleBitmap	(	HDC	hDC,
		INT	Width,
		INT	Height
	)

Definition at line 411 of file bitmaps.c.

{
    HBITMAP Bmp;
    PDC Dc;

    /* Check parameters */
    if ((Width <= 0) || (Height <= 0) || ((Width * Height) > 0x3FFFFFFF))
    {
        EngSetLastError(ERROR_INVALID_PARAMETER);
        return NULL;
    }

    if (!hDC)
        return GreCreateBitmap(Width, Height, 1, 1, 0);

    Dc = DC_LockDc(hDC);

    DPRINT("NtGdiCreateCompatibleBitmap(%p,%d,%d, bpp:%u) = \n",
           hDC, Width, Height, Dc->ppdev->gdiinfo.cBitsPixel);

    if (NULL == Dc)
    {
        EngSetLastError(ERROR_INVALID_HANDLE);
        return NULL;
    }

    Bmp = IntCreateCompatibleBitmap(Dc, Width, Height, 0, 0);

    DC_UnlockDc(Dc);
    return Bmp;
}

NtGdiGetBitmapBits()

LONG APIENTRY NtGdiGetBitmapBits	(	HBITMAP	hBitmap,
		ULONG	cjBuffer,
		OUT OPTIONAL PBYTE	pUnsafeBits
	)

Definition at line 552 of file bitmaps.c.

{
    PSURFACE psurf;
    ULONG cjSize;
    LONG ret;

    /* Check parameters */
    if (pUnsafeBits != NULL && cjBuffer == 0)
    {
        return 0;
    }

    /* Lock the bitmap */
    psurf = SURFACE_ShareLockSurface(hBitmap);
    if (!psurf)
    {
        EngSetLastError(ERROR_INVALID_HANDLE);
        return 0;
    }

    /* Calculate the size of the bitmap in bytes */
    cjSize = WIDTH_BYTES_ALIGN16(psurf->SurfObj.sizlBitmap.cx,
                BitsPerFormat(psurf->SurfObj.iBitmapFormat)) *
                psurf->SurfObj.sizlBitmap.cy;

    /* If the bits vector is null, the function should return the read size */
    if (pUnsafeBits == NULL)
    {
        SURFACE_ShareUnlockSurface(psurf);
        return cjSize;
    }

    /* Don't copy more bytes than the buffer has */
    cjBuffer = min(cjBuffer, cjSize);

    // FIXME: Use MmSecureVirtualMemory
    _SEH2_TRY
    {
        ProbeForWrite(pUnsafeBits, cjBuffer, 1);
        ret = UnsafeGetBitmapBits(psurf, cjBuffer, pUnsafeBits);
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        ret = 0;
    }
    _SEH2_END

    SURFACE_ShareUnlockSurface(psurf);

    return ret;
}

NtGdiGetBitmapDimension()

BOOL APIENTRY NtGdiGetBitmapDimension	(	HBITMAP	hBitmap,
		LPSIZE	psizDim
	)

Definition at line 475 of file bitmaps.c.

{
    SIZE dim;

    if (!GreGetBitmapDimension(hBitmap, &dim))
        return FALSE;

    /* Use SEH to copy the data to the caller */
    _SEH2_TRY
    {
        ProbeForWrite(psizDim, sizeof(*psizDim), 1);
        *psizDim = dim;
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        _SEH2_YIELD(return FALSE);
    }
    _SEH2_END

    return TRUE;
}

NtGdiGetDCforBitmap()

HDC APIENTRY NtGdiGetDCforBitmap

(

IN HBITMAP

hsurf

)

Definition at line 869 of file bitmaps.c.

{
    HDC hdc = NULL;
    PSURFACE psurf = SURFACE_ShareLockSurface(hsurf);
    if (psurf)
    {
        hdc = psurf->hdc;
        SURFACE_ShareUnlockSurface(psurf);
    }
    return hdc;
}

NtGdiSetBitmapBits()

LONG APIENTRY NtGdiSetBitmapBits	(	HBITMAP	hBitmap,
		DWORD	Bytes,
		IN PBYTE	pUnsafeBits
	)

Definition at line 609 of file bitmaps.c.

{
    LONG ret;
    PSURFACE psurf;

    if (pUnsafeBits == NULL || Bytes == 0)
    {
        return 0;
    }

    if (GDI_HANDLE_IS_STOCKOBJ(hBitmap))
    {
        return 0;
    }

    psurf = SURFACE_ShareLockSurface(hBitmap);
    if (psurf == NULL)
    {
        EngSetLastError(ERROR_INVALID_HANDLE);
        return 0;
    }

    if (((psurf->flags & API_BITMAP) == 0) ||
        (psurf->SurfObj.iBitmapFormat > BMF_32BPP))
    {
        DPRINT1("Invalid bitmap: iBitmapFormat = %lu, flags = 0x%lx\n",
                psurf->SurfObj.iBitmapFormat,
                psurf->flags);
        EngSetLastError(ERROR_INVALID_HANDLE);
        SURFACE_ShareUnlockSurface(psurf);
        return 0;
    }

    _SEH2_TRY
    {
        /* NOTE: Win2k3 doesn't check WORD alignment here. */
        ProbeForWrite(pUnsafeBits, Bytes, 1);
        ret = UnsafeSetBitmapBits(psurf, Bytes, pUnsafeBits);
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        ret = 0;
    }
    _SEH2_END

    SURFACE_ShareUnlockSurface(psurf);

    return ret;
}

NtGdiSetBitmapDimension()

BOOL APIENTRY NtGdiSetBitmapDimension	(	HBITMAP	hBitmap,
		INT	Width,
		INT	Height,
		LPSIZE	Size
	)

Definition at line 663 of file bitmaps.c.

{
    PSURFACE psurf;
    BOOL Ret = TRUE;

    if (hBitmap == NULL)
        return FALSE;

    psurf = SURFACE_ShareLockSurface(hBitmap);
    if (psurf == NULL)
    {
        EngSetLastError(ERROR_INVALID_HANDLE);
        return FALSE;
    }

    if (Size)
    {
        _SEH2_TRY
        {
            ProbeForWrite(Size, sizeof(SIZE), 1);
            *Size = psurf->sizlDim;
        }
        _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
        {
            Ret = FALSE;
        }
        _SEH2_END
    }

    /* The dimension is changed even if writing the old value failed */
    psurf->sizlDim.cx = Width;
    psurf->sizlDim.cy = Height;

    SURFACE_ShareUnlockSurface(psurf);

    return Ret;
}

UnsafeGetBitmapBits()

LONG FASTCALL UnsafeGetBitmapBits	(	PSURFACE	psurf,
		DWORD	Bytes,
		OUT PBYTE	pvBits
	)

Definition at line 502 of file bitmaps.c.

{
    PUCHAR pjDst, pjSrc;
    LONG lDeltaDst, lDeltaSrc, lDeltaSrcAbs;
    ULONG Y, iSrc, iDst, cbSrc, cbDst, nWidth, nHeight, cBitsPixel;

    nWidth = psurf->SurfObj.sizlBitmap.cx;
    nHeight = psurf->SurfObj.sizlBitmap.cy;
    cBitsPixel = BitsPerFormat(psurf->SurfObj.iBitmapFormat);

    /* Get pointers */
    pjSrc = psurf->SurfObj.pvScan0;
    pjDst = pvBits;
    lDeltaSrc = psurf->SurfObj.lDelta;
    lDeltaSrcAbs = labs(lDeltaSrc);
    lDeltaDst = WIDTH_BYTES_ALIGN16(nWidth, cBitsPixel);
    NT_ASSERT(lDeltaSrcAbs >= lDeltaDst);

    cbSrc = nHeight * lDeltaSrcAbs;
    cbDst = nHeight * lDeltaDst;
    Bytes = min(Bytes, cbDst);

    iSrc = iDst = 0;
    for (Y = 0; Y < nHeight; Y++)
    {
        if (iSrc + lDeltaSrcAbs > cbSrc || iDst + lDeltaDst > Bytes)
        {
            LONG lDelta = min(cbSrc - iSrc, Bytes - iDst);
            NT_ASSERT(lDelta >= 0);
            RtlCopyMemory(pjDst, pjSrc, lDelta);
            iDst += lDelta;
            break;
        }

        /* Copy one line */
        RtlCopyMemory(pjDst, pjSrc, lDeltaDst);
        pjSrc += lDeltaSrc;
        pjDst += lDeltaDst;
        iSrc += lDeltaSrcAbs;
        iDst += lDeltaDst;
    }

    return iDst;
}

Referenced by NtGdiGetBitmapBits().

UnsafeSetBitmapBits()

LONG NTAPI UnsafeSetBitmapBits	(	_Inout_ PSURFACE	psurf,
		_In_ ULONG	cjBits,
		_In_ const VOID *	pvBits
	)

Definition at line 48 of file bitmaps.c.

{
    PUCHAR pjDst;
    const UCHAR *pjSrc;
    LONG lDeltaDst, lDeltaSrc, lDeltaDstAbs;
    ULONG Y, iSrc, iDst, cbSrc, cbDst, nWidth, nHeight, cBitsPixel;

    NT_ASSERT(psurf->flags & API_BITMAP);
    NT_ASSERT(psurf->SurfObj.iBitmapFormat <= BMF_32BPP);

    nWidth = psurf->SurfObj.sizlBitmap.cx;
    nHeight = psurf->SurfObj.sizlBitmap.cy;
    cBitsPixel = BitsPerFormat(psurf->SurfObj.iBitmapFormat);

    pjDst = psurf->SurfObj.pvScan0;
    pjSrc = pvBits;
    lDeltaDst = psurf->SurfObj.lDelta;
    lDeltaDstAbs = labs(lDeltaDst);
    lDeltaSrc = WIDTH_BYTES_ALIGN16(nWidth, cBitsPixel);
    NT_ASSERT(lDeltaSrc <= lDeltaDstAbs);

    cbDst = lDeltaDstAbs * nHeight;
    cbSrc = lDeltaSrc * nHeight;
    cjBits = min(cjBits, cbSrc);

    iSrc = iDst = 0;
    for (Y = 0; Y < nHeight; Y++)
    {
        if (iSrc + lDeltaSrc > cjBits || iDst + lDeltaDstAbs > cbDst)
        {
            LONG lDelta = min(cjBits - iSrc, cbDst - iDst);
            NT_ASSERT(lDelta >= 0);
            RtlCopyMemory(pjDst, pjSrc, lDelta);
            iSrc += lDelta;
            break;
        }

        /* Copy one line */
        RtlCopyMemory(pjDst, pjSrc, lDeltaSrc);
        pjSrc += lDeltaSrc;
        pjDst += lDeltaDst;
        iSrc += lDeltaSrc;
        iDst += lDeltaDstAbs;
    }

    return iSrc;
}

Referenced by NtGdiCreateBitmap(), and NtGdiSetBitmapBits().