PBRUSH
NTAPI
PEN_AllocExtPenWithHandle(
VOID)
{
PPEN ppen;
ppen = (PBRUSH)GDIOBJ_AllocObjWithHandle(GDILoObjType_LO_EXTPEN_TYPE, sizeof(PEN));
if (ppen == NULL)
{
return NULL;
}
PEN_vInit(ppen);
return ppen;
}
PSURFACE
NTAPI
SURFACE_AllocSurface(
_In_ USHORT iType,
_In_ ULONG cx,
_In_ ULONG cy,
_In_ ULONG iFormat,
_In_ ULONG fjBitmap,
_In_opt_ ULONG cjWidth,
_In_opt_ ULONG cjBufSize,
_In_opt_ PVOID pvBits)
{
ULONG cBitsPixel, cjBits, cjObject;
PSURFACE psurf;
SURFOBJ *pso;
PVOID pvSection;
NT_ASSERT(!pvBits || (iType == STYPE_BITMAP));
NT_ASSERT((iFormat <= BMF_32BPP) || (cjBufSize != 0));
NT_ASSERT((LONG)cy > 0);
/* Verify format */
if ((iFormat < BMF_1BPP) || (iFormat > BMF_PNG))
{
DPRINT1("Invalid bitmap format: %lu\n", iFormat);
return NULL;
}
/* Get bits per pixel from the format */
cBitsPixel = gajBitsPerFormat[iFormat];
/* Are bits and a width in bytes given? */
if (pvBits && cjWidth)
{
/* Align the width (Windows compatibility, drivers expect that) */
cjWidth = WIDTH_BYTES_ALIGN32((cjWidth << 3) / cBitsPixel, cBitsPixel);
}
else
{
/* Calculate width from the bitmap width in pixels */
cjWidth = WIDTH_BYTES_ALIGN32(cx, cBitsPixel);
}
/* Is this an uncompressed format? */
if (iFormat <= BMF_32BPP)
{
/* Calculate the correct bitmap size in bytes */
if (!NT_SUCCESS(RtlULongMult(cjWidth, cy, &cjBits)))
{
DPRINT1("Overflow calculating size: cjWidth %lu, cy %lu\n",
cjWidth, cy);
return NULL;
}
/* Did we get a buffer and size? */
if ((pvBits != NULL) && (cjBufSize != 0))
{
/* Make sure the buffer is large enough */
if (cjBufSize < cjBits)
{
DPRINT1("Buffer is too small, required: %lu, got %lu\n",
cjBits, cjBufSize);
return NULL;
}
}
}
else
{
/* Compressed format, use the provided size */
NT_ASSERT(cjBufSize != 0);
cjBits = cjBufSize;
}
/* Check if we need an extra large object */
if ((iType == STYPE_BITMAP) && (pvBits == NULL) &&
!(fjBitmap & BMF_USERMEM) && !(fjBitmap & BMF_KMSECTION))
{
/* Allocate an object large enough to hold the bits */
cjObject = sizeof(SURFACE) + cjBits;
}
else
{
/* Otherwise just allocate the SURFACE structure */
cjObject = sizeof(SURFACE);
}
/* Check for arithmetic overflow */
if (cjObject < sizeof(SURFACE))
{
/* Fail! */
DPRINT1("Overflow calculating cjObject: cjBits %lu\n", cjBits);
return NULL;
}
/* Allocate a SURFACE object */
psurf = (PSURFACE)GDIOBJ_AllocObjWithHandle(GDI_OBJECT_TYPE_BITMAP, cjObject);
if (!psurf)
{
return NULL;
}
/* Initialize the basic fields */
pso = &psurf->SurfObj;
pso->hsurf = psurf->BaseObject.hHmgr;
pso->sizlBitmap.cx = cx;
pso->sizlBitmap.cy = cy;
pso->iBitmapFormat = iFormat;
pso->iType = iType;
pso->fjBitmap = (USHORT)fjBitmap;
pso->iUniq = InterlockedIncrement(&giUniqueSurface);
pso->cjBits = cjBits;
/* Check if we need a bitmap buffer */
if (iType == STYPE_BITMAP)
{
/* Check if we got one or if we need to allocate one */
if (pvBits != NULL)
{
/* Use the caller provided buffer */
pso->pvBits = pvBits;
}
else if (fjBitmap & BMF_USERMEM)
{
/* User mode memory was requested */
pso->pvBits = EngAllocUserMem(cjBits, 0);
/* Check for failure */
if (!pso->pvBits)
{
GDIOBJ_vDeleteObject(&psurf->BaseObject);
return NULL;
}
}
else if (fjBitmap & BMF_KMSECTION)
{
/* Use a kernel mode section */
pso->pvBits = EngAllocSectionMem(&pvSection,
(fjBitmap & BMF_NOZEROINIT) ?
0 : FL_ZERO_MEMORY,
cjBits, TAG_DIB);
/* Check for failure */
if (!pso->pvBits)
{
GDIOBJ_vDeleteObject(&psurf->BaseObject);
return NULL;
}
/* Free the section already, but keep the mapping */
EngFreeSectionMem(pvSection, NULL);
}
else
{
/* Buffer is after the object */
pso->pvBits = psurf + 1;
/* Zero the buffer, except requested otherwise */
if (!(fjBitmap & BMF_NOZEROINIT))
{
RtlZeroMemory(pso->pvBits, cjBits);
}
}
/* Set pvScan0 and lDelta */
if (fjBitmap & BMF_TOPDOWN)
{
/* Topdown is the normal way */
pso->pvScan0 = pso->pvBits;
pso->lDelta = cjWidth;
}
else
{
/* Inversed bitmap (bottom up) */
pso->pvScan0 = ((PCHAR)pso->pvBits + pso->cjBits - cjWidth);
pso->lDelta = -(LONG)cjWidth;
}
}
else
{
/* There are no bitmap bits */
pso->pvScan0 = pso->pvBits = NULL;
pso->lDelta = 0;
}
/* Assign a default palette and increment its reference count */
SURFACE_vSetPalette(psurf, appalSurfaceDefault[iFormat]);
return psurf;
}