screen.c

winNT技术操作系统,国外开放的原代码和LIUX一样

#include "../vgaddi.h"
#include "../vgavideo/vgavideo.h"

static WORD PaletteBuffer[] = {
   16, 0, // 16 entries, start with 0
   0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
};

static BYTE ColorBuffer[] = {
  16, // 16 entries
  0, 0,
  0,  // start with 0
  0x00, 0x00, 0x00, 0x00, // black
  0x2A, 0x00, 0x15, 0x00, // red
  0x00, 0x2A, 0x15, 0x00, // green
  0x2A, 0x2A, 0x15, 0x00, // brown
  0x00, 0x00, 0x2A, 0x00, // blue
  0x2A, 0x15, 0x2A, 0x00, // magenta
  0x15, 0x2A, 0x2A, 0x00, // cyan
  0x21, 0x22, 0x23, 0x00, // dark gray
  0x30, 0x31, 0x32, 0x00, // light gray
  0x3F, 0x00, 0x00, 0x00, // bright red
  0x00, 0x3F, 0x00, 0x00, // bright green
  0x3F, 0x3F, 0x00, 0x00, // bright yellow
  0x00, 0x00, 0x3F, 0x00, // bright blue
  0x3F, 0x00, 0x3F, 0x00, // bright magenta
  0x00, 0x3F, 0x3F, 0x00, // bright cyan
  0x3F, 0x3F, 0x3F, 0x00  // bright white
};

DWORD getAvailableModes(HANDLE Driver,
                        PVIDEO_MODE_INFORMATION *modeInformation,
                        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;
}

BOOL DeinitVGA(PPDEV ppdev)
{
  VIDEO_MEMORY VideoMemory;
  ULONG ReturnedDataLength;

  VideoMemory.RequestedVirtualAddress = (PVOID)ppdev->fbScreen;

  if (EngDeviceIoControl(ppdev->KMDriver,
			 IOCTL_VIDEO_UNMAP_VIDEO_MEMORY,
			 (PVOID)&VideoMemory,
			 sizeof(VIDEO_MEMORY),
			 NULL,
			 0,
			 &ReturnedDataLength))
    {
      DbgPrint("Failed to unmap video memory.\n");
      DbgBreakPoint();
      return(FALSE);
    }
  return(TRUE);
}

BOOL InitVGA(PPDEV ppdev, BOOL bFirst)
{
  ULONG ReturnedDataLength;
  VIDEO_MEMORY VideoMemory;
  VIDEO_MEMORY_INFORMATION VideoMemoryInfo;

  ppdev->sizeSurf.cx = 640;
  ppdev->sizeSurf.cy = 480;
  ppdev->ModeNum = 12;

  // Set the mode that was requested
  if (EngDeviceIoControl(ppdev->KMDriver,
                         IOCTL_VIDEO_SET_CURRENT_MODE,
                         &ppdev->ModeNum,
                         sizeof(VIDEO_MODE),
                         NULL,
                         0,
                         &ReturnedDataLength)) {
    return(FALSE);
  }

  // set up internal palette
  if (EngDeviceIoControl(ppdev->KMDriver,
                         IOCTL_VIDEO_SET_PALETTE_REGISTERS,
                         (PVOID) PaletteBuffer,
                         sizeof (PaletteBuffer),
                         NULL,
                         0,
                         &ReturnedDataLength)) {
     return(FALSE);
  }

  // set up the DAC
  if (EngDeviceIoControl(ppdev->KMDriver,
                          IOCTL_VIDEO_SET_COLOR_REGISTERS,
                          (PVOID) ColorBuffer,
                          sizeof (ColorBuffer),
                          NULL,
                          0,
                          &ReturnedDataLength)) {
    return(FALSE);
  }

  if (bFirst) {
      // map video memory into virtual memory
      VideoMemory.RequestedVirtualAddress = NULL;

      if (EngDeviceIoControl(ppdev->KMDriver,
                             IOCTL_VIDEO_MAP_VIDEO_MEMORY,
                             (PVOID) &VideoMemory,
                             sizeof (VIDEO_MEMORY),
                             (PVOID) &VideoMemoryInfo,
                             sizeof (VideoMemoryInfo),
                             &ReturnedDataLength)) {
         // Failed to map to virtual memory
         return (FALSE);
      }

      ppdev->fbScreen = VideoMemoryInfo.FrameBufferBase;
      vidmem = (PUCHAR)ppdev->fbScreen;
   }

  return TRUE;
}