Improved submenu and information menu appearance over a full-screen

[refind] / refind / menu.c

/*
 * refit/menu.c
 * Menu functions
 *
 * Copyright (c) 2006 Christoph Pfisterer
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the
 *    distribution.
 *
 *  * Neither the name of Christoph Pfisterer nor the names of the
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/*
 * Modifications copyright (c) 2012 Roderick W. Smith
 *
 * Modifications distributed under the terms of the GNU General Public
 * License (GPL) version 3 (GPLv3), a copy of which must be distributed
 * with this source code or binaries made from it.
 *
 */

#include "global.h"
#include "screen.h"
#include "lib.h"
#include "menu.h"
#include "config.h"
#include "libeg.h"
#include "libegint.h"
#include "../include/refit_call_wrapper.h"

#include "../include/egemb_back_selected_small.h"
#include "../include/egemb_arrow_left.h"
#include "../include/egemb_arrow_right.h"

// other menu definitions

#define MENU_FUNCTION_INIT            (0)
#define MENU_FUNCTION_CLEANUP         (1)
#define MENU_FUNCTION_PAINT_ALL       (2)
#define MENU_FUNCTION_PAINT_SELECTION (3)
#define MENU_FUNCTION_PAINT_TIMEOUT   (4)
#define MENU_FUNCTION_PAINT_HINTS     (5)

typedef VOID (*MENU_STYLE_FUNC)(IN REFIT_MENU_SCREEN *Screen, IN SCROLL_STATE *State, IN UINTN Function, IN CHAR16 *ParamText);

static CHAR16 ArrowUp[2] = { ARROW_UP, 0 };
static CHAR16 ArrowDown[2] = { ARROW_DOWN, 0 };

// Text and icon spacing constants....
#define TEXT_YMARGIN (2)
#define TEXT_XMARGIN (8)
#define TEXT_LINE_HEIGHT (FONT_CELL_HEIGHT + TEXT_YMARGIN * 2)
#define TITLEICON_SPACING (16)

#define ROW0_TILESIZE (144)
#define ROW1_TILESIZE (64)
#define TILE_XSPACING (8)
#define TILE_YSPACING (16)

// Alignment values for PaintIcon()
#define ALIGN_RIGHT 1
#define ALIGN_LEFT 0

static EG_IMAGE *SelectionImages[2] = { NULL, NULL };
static EG_PIXEL SelectionBackgroundPixel = { 0xff, 0xff, 0xff, 0 };

//
// Graphics helper functions
//

static VOID InitSelection(VOID)
{
    UINTN       x, y, src_x, src_y;
    EG_PIXEL    *DestPtr, *SrcPtr;

    if (!AllowGraphicsMode)
        return;
    if (SelectionImages[0] != NULL)
        return;

    // load small selection image
    if (GlobalConfig.SelectionSmallFileName != NULL) {
        SelectionImages[1] = egLoadImage(SelfDir, GlobalConfig.SelectionSmallFileName, TRUE);
    }
    if (SelectionImages[1] == NULL)
        SelectionImages[1] = egPrepareEmbeddedImage(&egemb_back_selected_small, TRUE);
    SelectionImages[1] = egEnsureImageSize(SelectionImages[1],
                                           ROW1_TILESIZE, ROW1_TILESIZE, &MenuBackgroundPixel);
    if (SelectionImages[1] == NULL)
        return;

    // load big selection image
    if (GlobalConfig.SelectionBigFileName != NULL) {
        SelectionImages[0] = egLoadImage(SelfDir, GlobalConfig.SelectionBigFileName, TRUE);
        SelectionImages[0] = egEnsureImageSize(SelectionImages[0],
                                               ROW0_TILESIZE, ROW0_TILESIZE, &MenuBackgroundPixel);
    }
    if (SelectionImages[0] == NULL) {
        // calculate big selection image from small one

        SelectionImages[0] = egCreateImage(ROW0_TILESIZE, ROW0_TILESIZE, TRUE);
        if (SelectionImages[0] == NULL) {
            egFreeImage(SelectionImages[1]);
            SelectionImages[1] = NULL;
            return;
        }

        DestPtr = SelectionImages[0]->PixelData;
        SrcPtr  = SelectionImages[1]->PixelData;
        for (y = 0; y < ROW0_TILESIZE; y++) {
            if (y < (ROW1_TILESIZE >> 1))
                src_y = y;
            else if (y < (ROW0_TILESIZE - (ROW1_TILESIZE >> 1)))
                src_y = (ROW1_TILESIZE >> 1);
            else
                src_y = y - (ROW0_TILESIZE - ROW1_TILESIZE);

            for (x = 0; x < ROW0_TILESIZE; x++) {
                if (x < (ROW1_TILESIZE >> 1))
                    src_x = x;
                else if (x < (ROW0_TILESIZE - (ROW1_TILESIZE >> 1)))
                    src_x = (ROW1_TILESIZE >> 1);
                else
                    src_x = x - (ROW0_TILESIZE - ROW1_TILESIZE);

                *DestPtr++ = SrcPtr[src_y * ROW1_TILESIZE + src_x];
            }
        }
    }
} // VOID InitSelection()

//
// Scrolling functions
//

static VOID InitScroll(OUT SCROLL_STATE *State, IN UINTN ItemCount, IN UINTN VisibleSpace)
{
    State->PreviousSelection = State->CurrentSelection = 0;
    State->MaxIndex = (INTN)ItemCount - 1;
    State->FirstVisible = 0;
    if (AllowGraphicsMode) {
       State->MaxVisible = UGAWidth / (ROW0_TILESIZE + TILE_XSPACING) - 1;
    } else
       State->MaxVisible = ConHeight - 4;
    if ((VisibleSpace > 0) && (VisibleSpace < State->MaxVisible))
        State->MaxVisible = (INTN)VisibleSpace;
    State->PaintAll = TRUE;
    State->PaintSelection = FALSE;

    State->LastVisible = State->FirstVisible + State->MaxVisible - 1;
}

// Adjust variables relating to the scrolling of tags, for when a selected icon isn't
// visible given the current scrolling condition....
static VOID AdjustScrollState(IN SCROLL_STATE *State) {
   if (State->CurrentSelection > State->LastVisible) {
      State->LastVisible = State->CurrentSelection;
      State->FirstVisible = 1 + State->CurrentSelection - State->MaxVisible;
      if (State->FirstVisible < 0) // shouldn't happen, but just in case....
         State->FirstVisible = 0;
      State->PaintAll = TRUE;
   } // Scroll forward
   if (State->CurrentSelection < State->FirstVisible) {
      State->FirstVisible = State->CurrentSelection;
      State->LastVisible = State->CurrentSelection + State->MaxVisible - 1;
      State->PaintAll = TRUE;
   } // Scroll backward
} // static VOID AdjustScrollState

static VOID UpdateScroll(IN OUT SCROLL_STATE *State, IN UINTN Movement)
{
    State->PreviousSelection = State->CurrentSelection;

    switch (Movement) {
        case SCROLL_LINE_LEFT:
            if (State->CurrentSelection > 0) {
                State->CurrentSelection --;
            }
            break;

        case SCROLL_LINE_RIGHT:
            if (State->CurrentSelection < State->MaxIndex) {
                State->CurrentSelection ++;
            }
            break;

        case SCROLL_LINE_UP:
            if (State->ScrollMode == SCROLL_MODE_ICONS) {
               if (State->CurrentSelection >= State->InitialRow1) {
                  if (State->MaxIndex > State->InitialRow1) { // avoid division by 0!
                     State->CurrentSelection = State->FirstVisible + (State->LastVisible - State->FirstVisible) *
                                               (State->CurrentSelection - State->InitialRow1) /
                                               (State->MaxIndex - State->InitialRow1);
                  } else {
                     State->CurrentSelection = State->FirstVisible;
                  } // if/else
               } // if in second row
            } else {
               if (State->CurrentSelection > 0)
                  State->CurrentSelection--;
            } // if/else
            break;

        case SCROLL_LINE_DOWN:
           if (State->ScrollMode == SCROLL_MODE_ICONS) {
               if (State->CurrentSelection <= State->FinalRow0) {
                  if (State->LastVisible > State->FirstVisible) { // avoid division by 0!
                     State->CurrentSelection = State->InitialRow1 + (State->MaxIndex - State->InitialRow1) *
                                               (State->CurrentSelection - State->FirstVisible) /
                                               (State->LastVisible - State->FirstVisible);
                  } else {
                     State->CurrentSelection = State->InitialRow1;
                  } // if/else
               } // if in first row
            } else {
               if (State->CurrentSelection < State->MaxIndex)
                  State->CurrentSelection++;
            } // if/else
            break;

        case SCROLL_PAGE_UP:
           if (State->CurrentSelection <= State->FinalRow0)
              State->CurrentSelection -= State->MaxVisible;
           else if (State->CurrentSelection == State->InitialRow1)
              State->CurrentSelection = State->FinalRow0;
           else
              State->CurrentSelection = State->InitialRow1;
           if (State->CurrentSelection < 0)
              State->CurrentSelection = 0;
           break;

        case SCROLL_FIRST:
           if (State->CurrentSelection > 0) {
              State->PaintAll = TRUE;
              State->CurrentSelection = 0;
           }
           break;

        case SCROLL_PAGE_DOWN:
           if (State->CurrentSelection < State->FinalRow0) {
              State->CurrentSelection += State->MaxVisible;
              if (State->CurrentSelection > State->FinalRow0)
                 State->CurrentSelection = State->FinalRow0;
           } else if (State->CurrentSelection == State->FinalRow0) {
              State->CurrentSelection++;
           } else {
              State->CurrentSelection = State->MaxIndex;
           }
           if (State->CurrentSelection > State->MaxIndex)
              State->CurrentSelection = State->MaxIndex;
           break;

        case SCROLL_LAST:
           if (State->CurrentSelection < State->MaxIndex) {
              State->PaintAll = TRUE;
              State->CurrentSelection = State->MaxIndex;
           }
           break;

        case SCROLL_NONE:
            break;

    }
    if (State->ScrollMode == SCROLL_MODE_TEXT)
       AdjustScrollState(State);

    if (!State->PaintAll && State->CurrentSelection != State->PreviousSelection)
        State->PaintSelection = TRUE;
    State->LastVisible = State->FirstVisible + State->MaxVisible - 1;
} // static VOID UpdateScroll()

//
// menu helper functions
//

VOID AddMenuInfoLine(IN REFIT_MENU_SCREEN *Screen, IN CHAR16 *InfoLine)
{
    AddListElement((VOID ***) &(Screen->InfoLines), &(Screen->InfoLineCount), InfoLine);
}

VOID AddMenuEntry(IN REFIT_MENU_SCREEN *Screen, IN REFIT_MENU_ENTRY *Entry)
{
    AddListElement((VOID ***) &(Screen->Entries), &(Screen->EntryCount), Entry);
}


static INTN FindMenuShortcutEntry(IN REFIT_MENU_SCREEN *Screen, IN CHAR16 *Shortcut)
{
    UINTN i;

    if (Shortcut == NULL)
       return (-1);

    if (StrLen(Shortcut) == 1) {
      if (Shortcut[0] >= 'a' && Shortcut[0] <= 'z')
         Shortcut[0] -= ('a' - 'A');
      if (Shortcut[0]) {
         for (i = 0; i < Screen->EntryCount; i++) {
               if (Screen->Entries[i]->ShortcutDigit == Shortcut[0] || Screen->Entries[i]->ShortcutLetter == Shortcut[0]) {
                  return i;
               } // if
         } // for
      } // if
    } else if (StrLen(Shortcut) > 1) {
       for (i = 0; i < Screen->EntryCount; i++) {
          if (StriSubCmp(Shortcut, Screen->Entries[i]->Title))
             return i;
       } // for
    }
    return -1;
}

// Identify the end of row 0 and the beginning of row 1; store the results in the
// appropriate fields in State. Also reduce MaxVisible if that value is greater
// than the total number of row-0 tags and if we're in an icon-based screen
static VOID IdentifyRows(IN SCROLL_STATE *State, IN REFIT_MENU_SCREEN *Screen) {
   UINTN i;

   State->FinalRow0 = 0;
   State->InitialRow1 = State->MaxIndex;
   for (i = 0; i < State->MaxIndex; i++) {
      if (Screen->Entries[i]->Row == 0) {
         State->FinalRow0 = i;
      } else if ((Screen->Entries[i]->Row == 1) && (State->InitialRow1 > i)) {
         State->InitialRow1 = i;
      } // if/else
   } // for
   if ((State->ScrollMode == SCROLL_MODE_ICONS) && (State->MaxVisible > (State->FinalRow0 + 1)))
      State->MaxVisible = State->FinalRow0 + 1;
} // static VOID IdentifyRows()

//
// generic menu function
//
static UINTN RunGenericMenu(IN REFIT_MENU_SCREEN *Screen, IN MENU_STYLE_FUNC StyleFunc, IN OUT INTN *DefaultEntryIndex,
                            OUT REFIT_MENU_ENTRY **ChosenEntry)
{
    SCROLL_STATE State;
    EFI_STATUS Status;
    EFI_INPUT_KEY key;
    UINTN index;
    INTN ShortcutEntry;
    BOOLEAN HaveTimeout = FALSE;
    UINTN TimeoutCountdown = 0;
    CHAR16 TimeoutMessage[256];
    CHAR16 KeyAsString[2];
    UINTN MenuExit;

    if (Screen->TimeoutSeconds > 0) {
        HaveTimeout = TRUE;
        TimeoutCountdown = Screen->TimeoutSeconds * 10;
    }
    MenuExit = 0;

    StyleFunc(Screen, &State, MENU_FUNCTION_INIT, NULL);
    IdentifyRows(&State, Screen);
    // override the starting selection with the default index, if any
    if (*DefaultEntryIndex >= 0 && *DefaultEntryIndex <= State.MaxIndex) {
        State.CurrentSelection = *DefaultEntryIndex;
        UpdateScroll(&State, SCROLL_NONE);
    }
    State.PaintAll = TRUE;

    while (!MenuExit) {
        // update the screen
        if (State.PaintAll) {
            StyleFunc(Screen, &State, MENU_FUNCTION_PAINT_ALL, NULL);
            State.PaintAll = FALSE;
        } else if (State.PaintSelection) {
            StyleFunc(Screen, &State, MENU_FUNCTION_PAINT_SELECTION, NULL);
            State.PaintSelection = FALSE;
        }

        if (HaveTimeout) {
            SPrint(TimeoutMessage, 255, L"%s in %d seconds", Screen->TimeoutText, (TimeoutCountdown + 5) / 10);
            StyleFunc(Screen, &State, MENU_FUNCTION_PAINT_TIMEOUT, TimeoutMessage);
        }

        // read key press (and wait for it if applicable)
        Status = refit_call2_wrapper(ST->ConIn->ReadKeyStroke, ST->ConIn, &key);
        if (Status == EFI_NOT_READY) {
            if (HaveTimeout && TimeoutCountdown == 0) {
                // timeout expired
                MenuExit = MENU_EXIT_TIMEOUT;
                break;
            } else if (HaveTimeout) {
                refit_call1_wrapper(BS->Stall, 100000);
                TimeoutCountdown--;
            } else
                refit_call3_wrapper(BS->WaitForEvent, 1, &ST->ConIn->WaitForKey, &index);
            continue;
        }
        if (HaveTimeout) {
            // the user pressed a key, cancel the timeout
            StyleFunc(Screen, &State, MENU_FUNCTION_PAINT_TIMEOUT, L"");
            HaveTimeout = FALSE;
        }

        // react to key press
        switch (key.ScanCode) {
            case SCAN_UP:
                UpdateScroll(&State, SCROLL_LINE_UP);
                break;
            case SCAN_LEFT:
                UpdateScroll(&State, SCROLL_LINE_LEFT);
                break;
            case SCAN_DOWN:
                UpdateScroll(&State, SCROLL_LINE_DOWN);
                break;
            case SCAN_RIGHT:
                UpdateScroll(&State, SCROLL_LINE_RIGHT);
                break;
            case SCAN_HOME:
                UpdateScroll(&State, SCROLL_FIRST);
                break;
            case SCAN_END:
                UpdateScroll(&State, SCROLL_LAST);
                break;
            case SCAN_PAGE_UP:
                UpdateScroll(&State, SCROLL_PAGE_UP);
                break;
            case SCAN_PAGE_DOWN:
                UpdateScroll(&State, SCROLL_PAGE_DOWN);
                break;
            case SCAN_ESC:
                MenuExit = MENU_EXIT_ESCAPE;
                break;
            case SCAN_INSERT:
            case SCAN_F2:
                MenuExit = MENU_EXIT_DETAILS;
                break;
            case SCAN_F10:
                egScreenShot();
                break;
            case 0x0016: // F12
               if (EjectMedia())
                  MenuExit = MENU_EXIT_ESCAPE;
               break;
        }
        switch (key.UnicodeChar) {
            case CHAR_LINEFEED:
            case CHAR_CARRIAGE_RETURN:
            case ' ':
                MenuExit = MENU_EXIT_ENTER;
                break;
            case '+':
                MenuExit = MENU_EXIT_DETAILS;
                break;
            default:
                KeyAsString[0] = key.UnicodeChar;
                KeyAsString[1] = 0;
                ShortcutEntry = FindMenuShortcutEntry(Screen, KeyAsString);
                if (ShortcutEntry >= 0) {
                    State.CurrentSelection = ShortcutEntry;
                    MenuExit = MENU_EXIT_ENTER;
                }
                break;
        }
    }

    StyleFunc(Screen, &State, MENU_FUNCTION_CLEANUP, NULL);

    if (ChosenEntry)
        *ChosenEntry = Screen->Entries[State.CurrentSelection];
    *DefaultEntryIndex = State.CurrentSelection;
    return MenuExit;
} /* static UINTN RunGenericMenu() */

//
// text-mode generic style
//

static VOID TextMenuStyle(IN REFIT_MENU_SCREEN *Screen, IN SCROLL_STATE *State, IN UINTN Function, IN CHAR16 *ParamText)
{
    INTN i;
    UINTN MenuWidth, ItemWidth, MenuHeight;
    static UINTN MenuPosY;
    static CHAR16 **DisplayStrings;
    CHAR16 TimeoutMessage[256];

    State->ScrollMode = SCROLL_MODE_TEXT;
    switch (Function) {

        case MENU_FUNCTION_INIT:
            // vertical layout
            MenuPosY = 4;
            if (Screen->InfoLineCount > 0)
                MenuPosY += Screen->InfoLineCount + 1;
            MenuHeight = ConHeight - MenuPosY - 3;
            if (Screen->TimeoutSeconds > 0)
                MenuHeight -= 2;
            InitScroll(State, Screen->EntryCount, MenuHeight);

            // determine width of the menu
            MenuWidth = 20;  // minimum
            for (i = 0; i <= State->MaxIndex; i++) {
                ItemWidth = StrLen(Screen->Entries[i]->Title);
                if (MenuWidth < ItemWidth)
                    MenuWidth = ItemWidth;
            }
            MenuWidth += 2;
            if (MenuWidth > ConWidth - 3)
                MenuWidth = ConWidth - 3;

            // prepare strings for display
            DisplayStrings = AllocatePool(sizeof(CHAR16 *) * Screen->EntryCount);
            for (i = 0; i <= State->MaxIndex; i++) {
                // Note: Theoretically, SPrint() is a cleaner way to do this; but the
                // description of the StrSize parameter to SPrint implies it's measured
                // in characters, but in practice both TianoCore and GNU-EFI seem to
                // use bytes instead, resulting in truncated displays. I could just
                // double the size of the StrSize parameter, but that seems unsafe in
                // case a future library change starts treating this as characters, so
                // I'm doing it the hard way in this instance.
                // TODO: Review the above and possibly change other uses of SPrint()
                DisplayStrings[i] = AllocateZeroPool(2 * sizeof(CHAR16));
                DisplayStrings[i][0] = L' ';
                MergeStrings(&DisplayStrings[i], Screen->Entries[i]->Title, 0);
                if (StrLen(DisplayStrings[i]) > MenuWidth)
                   DisplayStrings[i][MenuWidth - 1] = 0;
                // TODO: use more elaborate techniques for shortening too long strings (ellipses in the middle)
                // TODO: account for double-width characters
            } // for

            // initial painting
            BeginTextScreen(Screen->Title);
            if (Screen->InfoLineCount > 0) {
                refit_call2_wrapper(ST->ConOut->SetAttribute, ST->ConOut, ATTR_BASIC);
                for (i = 0; i < (INTN)Screen->InfoLineCount; i++) {
                    refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, 3, 4 + i);
                    refit_call2_wrapper(ST->ConOut->OutputString, ST->ConOut, Screen->InfoLines[i]);
                }
            }

            break;

        case MENU_FUNCTION_CLEANUP:
            // release temporary memory
            for (i = 0; i <= State->MaxIndex; i++)
                MyFreePool(DisplayStrings[i]);
            MyFreePool(DisplayStrings);
            break;

        case MENU_FUNCTION_PAINT_ALL:
            // paint the whole screen (initially and after scrolling)
            for (i = 0; i <= State->MaxIndex; i++) {
                if (i >= State->FirstVisible && i <= State->LastVisible) {
                    refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, 2, MenuPosY + (i - State->FirstVisible));
                    if (i == State->CurrentSelection)
                       refit_call2_wrapper(ST->ConOut->SetAttribute, ST->ConOut, ATTR_CHOICE_CURRENT);
                    else
                       refit_call2_wrapper(ST->ConOut->SetAttribute, ST->ConOut, ATTR_CHOICE_BASIC);
                    refit_call2_wrapper(ST->ConOut->OutputString, ST->ConOut, DisplayStrings[i]);
                }
            }
            // scrolling indicators
            refit_call2_wrapper(ST->ConOut->SetAttribute, ST->ConOut, ATTR_SCROLLARROW);
            refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, 0, MenuPosY);
            if (State->FirstVisible > 0)
                refit_call2_wrapper(ST->ConOut->OutputString, ST->ConOut, ArrowUp);
            else
               refit_call2_wrapper(ST->ConOut->OutputString, ST->ConOut, L" ");
            refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, 0, MenuPosY + State->MaxVisible);
            if (State->LastVisible < State->MaxIndex)
               refit_call2_wrapper(ST->ConOut->OutputString, ST->ConOut, ArrowDown);
            else
               refit_call2_wrapper(ST->ConOut->OutputString, ST->ConOut, L" ");
            if (!(GlobalConfig.HideUIFlags & HIDEUI_FLAG_HINTS)) {
               if (Screen->Hint1 != NULL) {
                  refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, 0, ConHeight - 2);
                  refit_call2_wrapper(ST->ConOut->OutputString, ST->ConOut, Screen->Hint1);
               }
               if (Screen->Hint2 != NULL) {
                  refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, 0, ConHeight - 1);
                  refit_call2_wrapper(ST->ConOut->OutputString, ST->ConOut, Screen->Hint2);
               }
            }
            break;

        case MENU_FUNCTION_PAINT_SELECTION:
            // redraw selection cursor
            refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, 2,
                                MenuPosY + (State->PreviousSelection - State->FirstVisible));
            refit_call2_wrapper(ST->ConOut->SetAttribute, ST->ConOut, ATTR_CHOICE_BASIC);
            refit_call2_wrapper(ST->ConOut->OutputString, ST->ConOut, DisplayStrings[State->PreviousSelection]);
            refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, 2,
                                MenuPosY + (State->CurrentSelection - State->FirstVisible));
            refit_call2_wrapper(ST->ConOut->SetAttribute, ST->ConOut, ATTR_CHOICE_CURRENT);
            refit_call2_wrapper(ST->ConOut->OutputString, ST->ConOut, DisplayStrings[State->CurrentSelection]);
            break;

        case MENU_FUNCTION_PAINT_TIMEOUT:
            if (ParamText[0] == 0) {
                // clear message
                refit_call2_wrapper(ST->ConOut->SetAttribute, ST->ConOut, ATTR_BASIC);
                refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, 0, ConHeight - 3);
                refit_call2_wrapper(ST->ConOut->OutputString, ST->ConOut, BlankLine + 1);
            } else {
                // paint or update message
                refit_call2_wrapper(ST->ConOut->SetAttribute, ST->ConOut, ATTR_ERROR);
                refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, 3, ConHeight - 3);
                SPrint(TimeoutMessage, 255, L"%s  ", ParamText);
                refit_call2_wrapper(ST->ConOut->OutputString, ST->ConOut, TimeoutMessage);
            }
            break;

    }
}

//
// graphical generic style
//


// Display a submenu
static VOID DrawSubmenuText(IN CHAR16 *Text, IN BOOLEAN Selected, IN UINTN FieldWidth, IN UINTN XPos, IN UINTN YPos)
{
//   UINTN TextWidth = TEXT_XMARGIN * 2 + StrLen(Text) * FONT_CELL_WIDTH;
   EG_IMAGE *TextBuffer;

   TextBuffer = egCreateImage(FieldWidth, TEXT_LINE_HEIGHT, FALSE);

   egFillImage(TextBuffer, &MenuBackgroundPixel);
   if (Selected) {
       // draw selection bar background
       egFillImageArea(TextBuffer, 0, 0, FieldWidth, TextBuffer->Height, &SelectionBackgroundPixel);
   }

   // render the text
   egRenderText(Text, TextBuffer, TEXT_XMARGIN, TEXT_YMARGIN);
   egDrawImageWithTransparency(TextBuffer, NULL, XPos, YPos, TextBuffer->Width, TextBuffer->Height);
//    BltImage(TextBuffer, XPos, YPos);
}

static VOID DrawMainMenuText(IN CHAR16 *Text, IN UINTN XPos, IN UINTN YPos)
{
    UINTN TextWidth, TextPosX;
    EG_IMAGE *TextBuffer;

    TextBuffer = egCropImage(GlobalConfig.ScreenBackground, XPos, YPos, LAYOUT_TEXT_WIDTH, TEXT_LINE_HEIGHT);

    // render the text
    egMeasureText(Text, &TextWidth, NULL);
    if (TextWidth > TextBuffer->Width)
       TextPosX = 0;
    else
       TextPosX = (TextBuffer->Width - TextWidth) / 2;
    egRenderText(Text, TextBuffer, TextPosX, 0);
    egDrawImageWithTransparency(TextBuffer, NULL, XPos, YPos, TextBuffer->Width, TextBuffer->Height);
}

// Compute the size & position of the window that will hold a subscreen's information.
static VOID ComputeSubScreenWindowSize(REFIT_MENU_SCREEN *Screen, IN SCROLL_STATE *State, UINTN *XPos, UINTN *YPos, UINTN *Width, UINTN *Height, UINTN *LineWidth) {
   UINTN i, ItemWidth, HintTop, BannerBottomEdge, TitleWidth, CenteredTop;

   *Width = 1;
   *Height = 5;
   TitleWidth = StrLen(Screen->Title);
   if ((Screen->TitleImage) && (TitleWidth > (Screen->TitleImage->Width / FONT_CELL_WIDTH))) {
      TitleWidth -= (Screen->TitleImage->Width / FONT_CELL_WIDTH);
   }
   if (TitleWidth > *Width) {
      *Width = TitleWidth;
   }
   for (i = 0; i < Screen->InfoLineCount; i++) {
       ItemWidth = StrLen(Screen->InfoLines[i]);
       if (*Width < ItemWidth) {
           *Width = ItemWidth;
       }
       (*Height)++;
   }
   for (i = 0; i <= State->MaxIndex; i++) {
       ItemWidth = StrLen(Screen->Entries[i]->Title);
       if (*Width < ItemWidth) {
           *Width = ItemWidth;
       }
       (*Height)++;
   }
   *Width = TEXT_XMARGIN * 2 + *Width * FONT_CELL_WIDTH;
   *LineWidth = *Width;
   if (Screen->TitleImage)
      *Width += (Screen->TitleImage->Width + TITLEICON_SPACING + FONT_CELL_WIDTH);
   else
      *Width += FONT_CELL_WIDTH;

   // Keep it within the bounds of the screen, or 2/3 of the screen's width
   // for screens over 800 pixels wide
   if (*Width > UGAWidth)
      *Width = UGAWidth;
   if ((*Width > (2 * UGAWidth) / 3) && (UGAWidth > 800))
      *Width = (2 * UGAWidth) / 3;

   *XPos = (UGAWidth - *Width) / 2;

   HintTop = UGAHeight - (FONT_CELL_HEIGHT * 3); // top of hint text
   *Height *= TEXT_LINE_HEIGHT;
   if (Screen->TitleImage && (*Height < (Screen->TitleImage->Height + TEXT_LINE_HEIGHT * 3)))
      *Height = Screen->TitleImage->Height + TEXT_LINE_HEIGHT * 3;

   if (GlobalConfig.BannerBottomEdge >= HintTop) { // probably a full-screen image; treat it as an empty banner
      BannerBottomEdge = 0;
   } else {
      BannerBottomEdge = GlobalConfig.BannerBottomEdge;
   }
   if (*Height > (HintTop -BannerBottomEdge - FONT_CELL_HEIGHT * 2)) {
      BannerBottomEdge = 0;
   }
   if (*Height > (HintTop -BannerBottomEdge - FONT_CELL_HEIGHT * 2)) {
      // TODO: Implement scrolling in text screen.
      *Height = (HintTop - BannerBottomEdge - FONT_CELL_HEIGHT * 2);
   }
   *YPos = BannerBottomEdge + FONT_CELL_HEIGHT + (HintTop - BannerBottomEdge - *Height) / 2;
   // Above often produces a text field that feels bottom-weighted, so adjust
   // upward a bit, if possible....
   CenteredTop = ((UGAHeight - *Height) / 2);
   if ((*YPos > CenteredTop) && (CenteredTop > BannerBottomEdge))
      *YPos = CenteredTop;
} // VOID ComputeSubScreenWindowSize()

// Displays sub-menus
static VOID GraphicsMenuStyle(IN REFIT_MENU_SCREEN *Screen, IN SCROLL_STATE *State, IN UINTN Function, IN CHAR16 *ParamText)
{
    INTN i;
    UINTN ItemWidth;
    static UINTN LineWidth, MenuWidth, MenuHeight, EntriesPosX, EntriesPosY, TimeoutPosY;
    EG_IMAGE *Window;
    EG_PIXEL *BackgroundPixel = &(GlobalConfig.ScreenBackground->PixelData[0]);

    State->ScrollMode = SCROLL_MODE_TEXT;
    switch (Function) {

        case MENU_FUNCTION_INIT:
            InitScroll(State, Screen->EntryCount, 0);
            ComputeSubScreenWindowSize(Screen, State, &EntriesPosX, &EntriesPosY, &MenuWidth, &MenuHeight, &LineWidth);
            TimeoutPosY = EntriesPosY + (Screen->EntryCount + 1) * TEXT_LINE_HEIGHT;

            // initial painting
            SwitchToGraphicsAndClear();
            Window = egCreateFilledImage(MenuWidth, MenuHeight, FALSE, BackgroundPixel);
            egDrawImage(Window, EntriesPosX, EntriesPosY);
            egMeasureText(Screen->Title, &ItemWidth, NULL);
            DrawSubmenuText(Screen->Title, FALSE, (StrLen(Screen->Title) + 2) * FONT_CELL_WIDTH,
                            EntriesPosX + (MenuWidth - ItemWidth) / 2, EntriesPosY += TEXT_LINE_HEIGHT);
            if (Screen->TitleImage) {
               BltImageAlpha(Screen->TitleImage, EntriesPosX, EntriesPosY + TEXT_LINE_HEIGHT * 2, BackgroundPixel);
               EntriesPosX += (Screen->TitleImage->Width + TITLEICON_SPACING);
            }
            EntriesPosY += (TEXT_LINE_HEIGHT * 2);
            if (Screen->InfoLineCount > 0) {
                for (i = 0; i < (INTN)Screen->InfoLineCount; i++) {
                    DrawSubmenuText(Screen->InfoLines[i], FALSE, LineWidth, EntriesPosX, EntriesPosY);
                    EntriesPosY += TEXT_LINE_HEIGHT;
                }
                EntriesPosY += TEXT_LINE_HEIGHT;  // also add a blank line
            }

            break;

        case MENU_FUNCTION_CLEANUP:
            // nothing to do
            break;

        case MENU_FUNCTION_PAINT_ALL:
            for (i = 0; i <= State->MaxIndex; i++) {
               DrawSubmenuText(Screen->Entries[i]->Title, (i == State->CurrentSelection), LineWidth,
                               EntriesPosX, EntriesPosY + i * TEXT_LINE_HEIGHT);
            }
            if (!(GlobalConfig.HideUIFlags & HIDEUI_FLAG_HINTS)) {
               if ((Screen->Hint1 != NULL) && (StrLen(Screen->Hint1) > 0))
                  DrawMainMenuText(Screen->Hint1, (UGAWidth - LAYOUT_TEXT_WIDTH) / 2, UGAHeight - (FONT_CELL_HEIGHT * 3));
               if ((Screen->Hint2 != NULL) && (StrLen(Screen->Hint2) > 0))
                  DrawMainMenuText(Screen->Hint2, (UGAWidth - LAYOUT_TEXT_WIDTH) / 2, UGAHeight - (FONT_CELL_HEIGHT * 2));
            } // if
            break;

        case MENU_FUNCTION_PAINT_SELECTION:
            // redraw selection cursor
            DrawSubmenuText(Screen->Entries[State->PreviousSelection]->Title, FALSE, LineWidth,
                         EntriesPosX, EntriesPosY + State->PreviousSelection * TEXT_LINE_HEIGHT);
            DrawSubmenuText(Screen->Entries[State->CurrentSelection]->Title, TRUE, LineWidth,
                         EntriesPosX, EntriesPosY + State->CurrentSelection * TEXT_LINE_HEIGHT);
            break;

        case MENU_FUNCTION_PAINT_TIMEOUT:
            DrawSubmenuText(ParamText, FALSE, LineWidth, EntriesPosX, TimeoutPosY);
            break;

    }
} // static VOID GraphicsMenuStyle()

//
// graphical main menu style
//

static VOID DrawMainMenuEntry(REFIT_MENU_ENTRY *Entry, BOOLEAN selected, UINTN XPos, UINTN YPos)
{
   EG_IMAGE *Background;

   if (SelectionImages != NULL) {
      if (selected) {
         Background = egCropImage(GlobalConfig.ScreenBackground, XPos, YPos,
                                  SelectionImages[Entry->Row]->Width, SelectionImages[Entry->Row]->Height);
         egComposeImage(Background, SelectionImages[Entry->Row], 0, 0);
         BltImageCompositeBadge(Background, Entry->Image, Entry->BadgeImage, XPos, YPos);
      } else { // Image not selected; copy background
         egDrawImageWithTransparency(Entry->Image, Entry->BadgeImage, XPos, YPos,
                                     SelectionImages[Entry->Row]->Width, SelectionImages[Entry->Row]->Height);
      } // if/else
   } // if
} // VOID DrawMainMenuEntry()

static VOID PaintAll(IN REFIT_MENU_SCREEN *Screen, IN SCROLL_STATE *State, UINTN *itemPosX,
                     UINTN row0PosY, UINTN row1PosY, UINTN textPosY) {
   INTN i;

   if (Screen->Entries[State->CurrentSelection]->Row == 0)
      AdjustScrollState(State);
   for (i = State->FirstVisible; i <= State->MaxIndex; i++) {
      if (Screen->Entries[i]->Row == 0) {
         if (i <= State->LastVisible) {
            DrawMainMenuEntry(Screen->Entries[i], (i == State->CurrentSelection) ? TRUE : FALSE,
                              itemPosX[i - State->FirstVisible], row0PosY);
         } // if
      } else {
         DrawMainMenuEntry(Screen->Entries[i], (i == State->CurrentSelection) ? TRUE : FALSE, itemPosX[i], row1PosY);
      }
   }
   if (!(GlobalConfig.HideUIFlags & HIDEUI_FLAG_LABEL))
      DrawMainMenuText(Screen->Entries[State->CurrentSelection]->Title,
                       (UGAWidth - LAYOUT_TEXT_WIDTH) >> 1, textPosY);

   if (!(GlobalConfig.HideUIFlags & HIDEUI_FLAG_HINTS)) {
      DrawMainMenuText(Screen->Hint1, (UGAWidth - LAYOUT_TEXT_WIDTH) / 2, UGAHeight - (FONT_CELL_HEIGHT * 3));
      DrawMainMenuText(Screen->Hint2, (UGAWidth - LAYOUT_TEXT_WIDTH) / 2, UGAHeight - (FONT_CELL_HEIGHT * 2));
   } // if
} // static VOID PaintAll()

// Move the selection to State->CurrentSelection, adjusting icon row if necessary...
static VOID PaintSelection(IN REFIT_MENU_SCREEN *Screen, IN SCROLL_STATE *State, UINTN *itemPosX,
                           UINTN row0PosY, UINTN row1PosY, UINTN textPosY) {
   UINTN XSelectPrev, XSelectCur, YPosPrev, YPosCur;

   if (((State->CurrentSelection <= State->LastVisible) && (State->CurrentSelection >= State->FirstVisible)) ||
       (State->CurrentSelection >= State->InitialRow1) ) {
      if (Screen->Entries[State->PreviousSelection]->Row == 0) {
         XSelectPrev = State->PreviousSelection - State->FirstVisible;
         YPosPrev = row0PosY;
      } else {
         XSelectPrev = State->PreviousSelection;
         YPosPrev = row1PosY;
      } // if/else
      if (Screen->Entries[State->CurrentSelection]->Row == 0) {
         XSelectCur = State->CurrentSelection - State->FirstVisible;
         YPosCur = row0PosY;
      } else {
         XSelectCur = State->CurrentSelection;
         YPosCur = row1PosY;
      } // if/else
      DrawMainMenuEntry(Screen->Entries[State->PreviousSelection], FALSE, itemPosX[XSelectPrev], YPosPrev);
      DrawMainMenuEntry(Screen->Entries[State->CurrentSelection], TRUE, itemPosX[XSelectCur], YPosCur);
      if (!(GlobalConfig.HideUIFlags & HIDEUI_FLAG_LABEL))
         DrawMainMenuText(Screen->Entries[State->CurrentSelection]->Title,
                          (UGAWidth - LAYOUT_TEXT_WIDTH) >> 1, textPosY);
   } else { // Current selection not visible; must redraw the menu....
      MainMenuStyle(Screen, State, MENU_FUNCTION_PAINT_ALL, NULL);
   }
} // static VOID MoveSelection(VOID)

// Display an icon at the specified location. Uses the image specified by
// ExternalFilename if it's available, or BuiltInImage if it's not. The 
// Y position is specified as the center value, and so is adjusted by half
// the icon's height. The X position is set along the icon's left
// edge if Alignment == ALIGN_LEFT, and along the right edge if
// Alignment == ALIGN_RIGHT
static VOID PaintIcon(IN EG_EMBEDDED_IMAGE *BuiltInIcon, IN CHAR16 *ExternalFilename, UINTN PosX, UINTN PosY, UINTN Alignment) {
   EG_IMAGE *Icon = NULL;

   if (FileExists(SelfDir, ExternalFilename))
      Icon = egLoadIcon(SelfDir, ExternalFilename, 48);
   if (Icon == NULL)
      Icon = egPrepareEmbeddedImage(BuiltInIcon, TRUE);
   if (Icon != NULL) {
      if (Alignment == ALIGN_RIGHT)
         PosX -= Icon->Width;
      egDrawImageWithTransparency(Icon, NULL, PosX, PosY - (Icon->Height / 2), Icon->Width, Icon->Height);
   }
} // static VOID PaintIcon()

inline UINTN ComputeRow0PosX(VOID) {
//   return ((UGAHeight / 2) - (5 * ROW0_TILESIZE / 6));
   return ((UGAHeight / 2) - ROW0_TILESIZE / 2);
} // UINTN ComputeRow0PosX()

// Display (or erase) the arrow icons to the left and right of an icon's row,
// as appropriate.
static VOID PaintArrows(SCROLL_STATE *State, UINTN PosX, UINTN PosY, UINTN row0Loaders) {
   CHAR16 FileName[256];
   EG_IMAGE *TempImage;
   UINTN Width, Height, RightX, AdjPosY;

   // NOTE: Assume that left and right arrows are of the same size....
   Width = egemb_arrow_left.Width;
   Height = egemb_arrow_left.Height;
   RightX = (UGAWidth + (ROW0_TILESIZE + TILE_XSPACING) * State->MaxVisible) / 2 + TILE_XSPACING;
   AdjPosY = PosY - (Height / 2);

   // For PaintIcon() calls, the starting Y position is moved to the midpoint
   // of the surrounding row; PaintIcon() adjusts this back up by half the
   // icon's height to properly center it.
   if ((State->FirstVisible > 0) && (!(GlobalConfig.HideUIFlags & HIDEUI_FLAG_ARROWS))) {
      SPrint(FileName, 255, L"%s\\arrow_left.icns", GlobalConfig.IconsDir ? GlobalConfig.IconsDir : DEFAULT_ICONS_DIR);
      PaintIcon(&egemb_arrow_left, FileName, PosX, PosY, ALIGN_RIGHT);
   } else {
      TempImage = egCropImage(GlobalConfig.ScreenBackground, PosX - Width, AdjPosY, Width, Height);
      BltImage(TempImage, PosX - Width, AdjPosY);
      egFreeImage(TempImage);
   } // if/else

   if ((State->LastVisible < (row0Loaders - 1)) && (!(GlobalConfig.HideUIFlags & HIDEUI_FLAG_ARROWS))) {
      SPrint(FileName, 255, L"%s\\arrow_right.icns", GlobalConfig.IconsDir ? GlobalConfig.IconsDir : DEFAULT_ICONS_DIR);
      PaintIcon(&egemb_arrow_right, FileName, RightX, PosY, ALIGN_LEFT);
   } else {
      TempImage = egCropImage(GlobalConfig.ScreenBackground, RightX, AdjPosY, Width, Height);
      BltImage(TempImage, RightX, AdjPosY);
      egFreeImage(TempImage);
   } // if/else
} // VOID PaintArrows()

// Display main menu in graphics mode
VOID MainMenuStyle(IN REFIT_MENU_SCREEN *Screen, IN SCROLL_STATE *State, IN UINTN Function, IN CHAR16 *ParamText)
{
    INTN i;
    static UINTN row0PosX, row0PosXRunning, row1PosY, row0Loaders;
    UINTN row0Count, row1Count, row1PosX, row1PosXRunning;
    static UINTN *itemPosX;
    static UINTN row0PosY, textPosY;

    State->ScrollMode = SCROLL_MODE_ICONS;
    switch (Function) {

        case MENU_FUNCTION_INIT:
            InitScroll(State, Screen->EntryCount, GlobalConfig.MaxTags);

            // layout
            row0Count = 0;
            row1Count = 0;
            row0Loaders = 0;
            for (i = 0; i <= State->MaxIndex; i++) {
               if (Screen->Entries[i]->Row == 1) {
                  row1Count++;
               } else {
                  row0Loaders++;
                  if (row0Count < State->MaxVisible)
                     row0Count++;
               }
            }
            row0PosX = (UGAWidth + TILE_XSPACING - (ROW0_TILESIZE + TILE_XSPACING) * row0Count) >> 1;
            row0PosY = ComputeRow0PosX();
            row1PosX = (UGAWidth + TILE_XSPACING - (ROW1_TILESIZE + TILE_XSPACING) * row1Count) >> 1;
            row1PosY = row0PosY + ROW0_TILESIZE + TILE_YSPACING;
            if (row1Count > 0)
                textPosY = row1PosY + ROW1_TILESIZE + TILE_YSPACING;
            else
                textPosY = row1PosY;

            itemPosX = AllocatePool(sizeof(UINTN) * Screen->EntryCount);
            row0PosXRunning = row0PosX;
            row1PosXRunning = row1PosX;
            for (i = 0; i <= State->MaxIndex; i++) {
                if (Screen->Entries[i]->Row == 0) {
                    itemPosX[i] = row0PosXRunning;
                    row0PosXRunning += ROW0_TILESIZE + TILE_XSPACING;
                } else {
                    itemPosX[i] = row1PosXRunning;
                    row1PosXRunning += ROW1_TILESIZE + TILE_XSPACING;
                }
            }
            // initial painting
            InitSelection();
            SwitchToGraphicsAndClear();
            break;

        case MENU_FUNCTION_CLEANUP:
            MyFreePool(itemPosX);
            break;

        case MENU_FUNCTION_PAINT_ALL:
            PaintAll(Screen, State, itemPosX, row0PosY, row1PosY, textPosY);
            // For PaintArrows(), the starting Y position is moved to the midpoint
            // of the surrounding row; PaintIcon() adjusts this back up by half the
            // icon's height to properly center it.
            PaintArrows(State, row0PosX - TILE_XSPACING, row0PosY + (ROW0_TILESIZE / 2), row0Loaders);
            break;

        case MENU_FUNCTION_PAINT_SELECTION:
            PaintSelection(Screen, State, itemPosX, row0PosY, row1PosY, textPosY);
            break;

        case MENU_FUNCTION_PAINT_TIMEOUT:
            if (!(GlobalConfig.HideUIFlags & HIDEUI_FLAG_LABEL))
                DrawMainMenuText(ParamText, (UGAWidth - LAYOUT_TEXT_WIDTH) >> 1, textPosY + TEXT_LINE_HEIGHT);
            break;

    }
} // VOID MainMenuStyle()

// Enable the user to edit boot loader options.
// Returns TRUE if the user exited with edited options; FALSE if the user
// pressed Esc to terminate the edit.
static BOOLEAN EditOptions(LOADER_ENTRY *MenuEntry) {
   UINTN x_max, y_max;
   CHAR16 *EditedOptions;
   BOOLEAN retval = FALSE;

   if (GlobalConfig.HideUIFlags & HIDEUI_FLAG_EDITOR) {
      return FALSE;
   }

   refit_call4_wrapper(ST->ConOut->QueryMode, ST->ConOut, ST->ConOut->Mode->Mode, &x_max, &y_max);

   if (!GlobalConfig.TextOnly)
      SwitchToText(TRUE);

   if (line_edit(MenuEntry->LoadOptions, &EditedOptions, x_max)) {
      MyFreePool(MenuEntry->LoadOptions);
      MenuEntry->LoadOptions = EditedOptions;
      retval = TRUE;
   } // if
   if (!GlobalConfig.TextOnly)
      SwitchToGraphics();
   return retval;
} // VOID EditOptions()

//
// user-callable dispatcher functions
//

UINTN RunMenu(IN REFIT_MENU_SCREEN *Screen, OUT REFIT_MENU_ENTRY **ChosenEntry)
{
    INTN            DefaultEntry = -1;
    MENU_STYLE_FUNC Style = TextMenuStyle;

    if (AllowGraphicsMode)
        Style = GraphicsMenuStyle;

    return RunGenericMenu(Screen, Style, &DefaultEntry, ChosenEntry);
}

UINTN RunMainMenu(IN REFIT_MENU_SCREEN *Screen, IN CHAR16* DefaultSelection, OUT REFIT_MENU_ENTRY **ChosenEntry)
{
    MENU_STYLE_FUNC Style = TextMenuStyle;
    MENU_STYLE_FUNC MainStyle = TextMenuStyle;
    REFIT_MENU_ENTRY *TempChosenEntry;
    UINTN MenuExit = 0;
    INTN DefaultEntryIndex = -1;
    INTN DefaultSubmenuIndex = -1;

    if (DefaultSelection != NULL) {
        // Find a menu entry that includes *DefaultSelection as a substring
        DefaultEntryIndex = FindMenuShortcutEntry(Screen, DefaultSelection);
    }

    if (AllowGraphicsMode) {
        Style = GraphicsMenuStyle;
        MainStyle = MainMenuStyle;
    }

    while (!MenuExit) {
        MenuExit = RunGenericMenu(Screen, MainStyle, &DefaultEntryIndex, &TempChosenEntry);
        Screen->TimeoutSeconds = 0;

        if (MenuExit == MENU_EXIT_DETAILS) {
            if (TempChosenEntry->SubScreen != NULL) {
               MenuExit = RunGenericMenu(TempChosenEntry->SubScreen, Style, &DefaultSubmenuIndex, &TempChosenEntry);
               if (MenuExit == MENU_EXIT_ESCAPE || TempChosenEntry->Tag == TAG_RETURN)
                   MenuExit = 0;
               if (MenuExit == MENU_EXIT_DETAILS) {
                  if (!EditOptions((LOADER_ENTRY *) TempChosenEntry))
                     MenuExit = 0;
               } // if
            } else { // no sub-screen; ignore keypress
               MenuExit = 0;
            }
        } // Enter sub-screen
    }

    if (ChosenEntry)
        *ChosenEntry = TempChosenEntry;
    return MenuExit;
} /* UINTN RunMainMenu() */