DWORD getAvailableModes(
HANDLE hDriver,
PVIDEO_MODE_INFORMATION *modeInformation,
DWORD *cbModeSize)
{
ULONG ulTemp;
VIDEO_NUM_MODES modes;
PVIDEO_MODE_INFORMATION pVideoTemp;
//
// Get the number of modes supported by the mini-port
//
if (EngDeviceIoControl(hDriver,
IOCTL_VIDEO_QUERY_NUM_AVAIL_MODES,
NULL,
0,
&modes,
sizeof(VIDEO_NUM_MODES),
&ulTemp))
{
DISPDBG((0, "vga64k getAvailableModes failed VIDEO_QUERY_NUM_AVAIL_MODES\n"));
return(0);
}
*cbModeSize = modes.ModeInformationLength;
//
// Allocate the buffer for the mini-port to write the modes in.
//
*modeInformation = (PVIDEO_MODE_INFORMATION)
EngAllocMem(FL_ZERO_MEMORY,
modes.NumModes *
modes.ModeInformationLength, ALLOC_TAG);
if (*modeInformation == (PVIDEO_MODE_INFORMATION) NULL)
{
DISPDBG((0, "vga64k getAvailableModes failed EngAllocMem\n"));
return 0;
}
//
// Ask the mini-port to fill in the available modes.
//
if (EngDeviceIoControl(hDriver,
IOCTL_VIDEO_QUERY_AVAIL_MODES,
NULL,
0,
*modeInformation,
modes.NumModes * modes.ModeInformationLength,
&ulTemp))
{
DISPDBG((0, "vga64k getAvailableModes failed VIDEO_QUERY_AVAIL_MODES\n"));
EngFreeMem(*modeInformation);
*modeInformation = (PVIDEO_MODE_INFORMATION) NULL;
return(0);
}
//
// Now see which of these modes are supported by the display driver.
// As an internal mechanism, set the length to 0 for the modes we
// DO NOT support.
//
ulTemp = modes.NumModes;
pVideoTemp = *modeInformation;
//
// Mode is rejected if it is not one plane, or not graphics, or is not
// one of 16 bits per pel (that is all the vga64k currently supports)
//
while (ulTemp--)
{
if ((pVideoTemp->NumberOfPlanes != 1 ) ||
!(pVideoTemp->AttributeFlags & VIDEO_MODE_GRAPHICS) ||
(pVideoTemp->BitsPerPlane != 16) ||
//
// This next condition says that either the mode doesn't
// require broken rasters, or else the ScreenStride has
// already been set to some funky value. Some miniports
// choose strides that have broken rasters, but they're
// limited to unused areas of video memory. I only know of
// 1928, so we'll special case that.
//
(BROKEN_RASTERS(pVideoTemp->ScreenStride,
pVideoTemp->VisScreenHeight) &&
(pVideoTemp->ScreenStride != 1928)))
{
pVideoTemp->Length = 0;
}
pVideoTemp = (PVIDEO_MODE_INFORMATION)
(((PUCHAR)pVideoTemp) + modes.ModeInformationLength);
}
return modes.NumModes;
}
DWORD getAvailableModes(
HANDLE hDriver,
PVIDEO_MODE_INFORMATION *modeInformation,
DWORD *cbModeSize)
{
ULONG ulTemp;
VIDEO_NUM_MODES modes;
PVIDEO_MODE_INFORMATION pVideoTemp;
//
// Get the number of modes supported by the mini-port
//
if (EngDeviceIoControl(hDriver,
IOCTL_VIDEO_QUERY_NUM_AVAIL_MODES,
NULL,
0,
&modes,
sizeof(VIDEO_NUM_MODES),
&ulTemp))
{
DISPDBG((0, "getAvailableModes failed VIDEO_QUERY_NUM_AVAIL_MODES\n"));
return(0);
}
*cbModeSize = modes.ModeInformationLength;
//
// Allocate the buffer for the mini-port to write the modes in.
//
*modeInformation = (PVIDEO_MODE_INFORMATION)
EngAllocMem(0, modes.NumModes *
modes.ModeInformationLength, ALLOC_TAG);
if (*modeInformation == (PVIDEO_MODE_INFORMATION) NULL)
{
DISPDBG((0, "getAvailableModes failed EngAllocMem\n"));
return 0;
}
//
// Ask the mini-port to fill in the available modes.
//
if (EngDeviceIoControl(hDriver,
IOCTL_VIDEO_QUERY_AVAIL_MODES,
NULL,
0,
*modeInformation,
modes.NumModes * modes.ModeInformationLength,
&ulTemp))
{
DISPDBG((0, "getAvailableModes failed VIDEO_QUERY_AVAIL_MODES\n"));
EngFreeMem(*modeInformation);
*modeInformation = (PVIDEO_MODE_INFORMATION) NULL;
return(0);
}
//
// Now see which of these modes are supported by the display driver.
// As an internal mechanism, set the length to 0 for the modes we
// DO NOT support.
//
ulTemp = modes.NumModes;
pVideoTemp = *modeInformation;
//
// Mode is rejected if it is not 4 planes, or not graphics, or is not
// one of 1 bits per pel.
//
while (ulTemp--)
{
if ((pVideoTemp->NumberOfPlanes != 4 ) ||
!(pVideoTemp->AttributeFlags & VIDEO_MODE_GRAPHICS) ||
(pVideoTemp->BitsPerPlane != 1) ||
BROKEN_RASTERS(pVideoTemp->ScreenStride,
pVideoTemp->VisScreenHeight))
{
pVideoTemp->Length = 0;
}
pVideoTemp = (PVIDEO_MODE_INFORMATION)
(((PUCHAR)pVideoTemp) + modes.ModeInformationLength);
}
return modes.NumModes;
}
DWORD getAvailableModes(
IN HANDLE Driver,
OUT PVIDEO_MODE_INFORMATION *modeInformation,
OUT DWORD *ModeSize)
{
ULONG Temp;
VIDEO_NUM_MODES modes;
PVIDEO_MODE_INFORMATION VideoTemp;
/* get number of modes supported */
if (EngDeviceIoControl(Driver,
IOCTL_VIDEO_QUERY_NUM_AVAIL_MODES,
NULL,
0,
&modes,
sizeof(VIDEO_NUM_MODES),
&Temp))
{
/* get modes failed */
return 0;
}
*ModeSize = modes.ModeInformationLength;
/* allocate buffer for the mini-port to write the modes in */
*modeInformation = (PVIDEO_MODE_INFORMATION)
EngAllocMem(0, modes.NumModes *
modes.ModeInformationLength, ALLOC_TAG);
if (*modeInformation == (PVIDEO_MODE_INFORMATION) NULL)
{
/* couldn't allocate buffer */
return 0;
}
/* Ask the mini-port to fill in the available modes. */
if (EngDeviceIoControl(Driver,
IOCTL_VIDEO_QUERY_AVAIL_MODES,
NULL,
0,
*modeInformation,
modes.NumModes * modes.ModeInformationLength,
&Temp))
{
/* failed to query modes */
EngFreeMem(*modeInformation);
*modeInformation = (PVIDEO_MODE_INFORMATION) NULL;
return 0;
}
/* Which modes supported by miniport driver are also suppoted by us, the
* display driver */
Temp = modes.NumModes;
VideoTemp = *modeInformation;
/* Reject mode if it's not 4 planes or not graphic or not 1 bits per pel */
while (Temp--)
{
if ((VideoTemp->NumberOfPlanes != 4 ) ||
!(VideoTemp->AttributeFlags & VIDEO_MODE_GRAPHICS) ||
(VideoTemp->BitsPerPlane != 1) ||
BROKEN_RASTERS(VideoTemp->ScreenStride, VideoTemp->VisScreenHeight))
{
VideoTemp->Length = 0;
}
VideoTemp = (PVIDEO_MODE_INFORMATION)(((PUCHAR)VideoTemp) + modes.ModeInformationLength);
}
return modes.NumModes;
}
