OutputStGop.c

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#include <Uefi.h>
 
#include <Protocol/GraphicsOutput.h>
 
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
 
#include "../GuiIo.h"
 
#define MIN_RESOLUTION_HORIZONTAL  640U
#define MIN_RESOLUTION_VERTICAL    480U
 
struct GUI_OUTPUT_CONTEXT_ {
  EFI_GRAPHICS_OUTPUT_PROTOCOL    *Gop;
};
 
STATIC
EFI_GRAPHICS_OUTPUT_PROTOCOL *
InternalGuiOutputLocateGop (
  VOID
  )
{
  EFI_STATUS                    Status;
  EFI_GRAPHICS_OUTPUT_PROTOCOL  *Gop;
 
  Status = gBS->HandleProtocol (
                  gST->ConsoleOutHandle,
                  &gEfiGraphicsOutputProtocolGuid,
                  (VOID **)&Gop
                  );
  if (EFI_ERROR (Status)) {
    //
    // Do not fall back to other GOP instances to match AppleEvent.
    //
    return NULL;
  }
 
  return Gop;
}
 
GUI_OUTPUT_CONTEXT *
GuiOutputConstruct (
  IN UINT32  Scale
  )
{
  // TODO: alloc on the fly?
  STATIC GUI_OUTPUT_CONTEXT  Context;
 
  EFI_GRAPHICS_OUTPUT_PROTOCOL  *Gop;
 
  Gop = InternalGuiOutputLocateGop ();
  if (Gop == NULL) {
    return NULL;
  }
 
  if (  (Gop->Mode->Info->HorizontalResolution < MIN_RESOLUTION_HORIZONTAL * Scale)
     || (Gop->Mode->Info->VerticalResolution < MIN_RESOLUTION_VERTICAL * Scale))
  {
    DEBUG ((
      DEBUG_WARN,
      "OCUI: Expected at least %dx%d for resolution, actual %dx%d\n",
      MIN_RESOLUTION_HORIZONTAL * Scale,
      MIN_RESOLUTION_VERTICAL * Scale,
      Gop->Mode->Info->HorizontalResolution,
      Gop->Mode->Info->VerticalResolution
      ));
    return NULL;
  }
 
  Context.Gop = Gop;
  return &Context;
}
 
EFI_STATUS
EFIAPI
GuiOutputBlt (
  IN GUI_OUTPUT_CONTEXT                 *Context,
  IN EFI_GRAPHICS_OUTPUT_BLT_PIXEL      *BltBuffer OPTIONAL,
  IN EFI_GRAPHICS_OUTPUT_BLT_OPERATION  BltOperation,
  IN UINTN                              SourceX,
  IN UINTN                              SourceY,
  IN UINTN                              DestinationX,
  IN UINTN                              DestinationY,
  IN UINTN                              Width,
  IN UINTN                              Height,
  IN UINTN                              Delta OPTIONAL
  )
{
  return Context->Gop->Blt (
                         Context->Gop,
                         BltBuffer,
                         BltOperation,
                         SourceX,
                         SourceY,
                         DestinationX,
                         DestinationY,
                         Width,
                         Height,
                         Delta
                         );
}
 
CONST EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *
GuiOutputGetInfo (
  IN GUI_OUTPUT_CONTEXT  *Context
  )
{
  return Context->Gop->Mode->Info;
}
 
VOID
GuiOutputDestruct (
  IN GUI_OUTPUT_CONTEXT  *Context
  )
{
  ASSERT (Context != NULL);
  ZeroMem (Context, sizeof (*Context));
}