loadbmp.cpp

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/*
**  Command & Conquer Generals Zero Hour(tm)
**  Copyright 2025 Electronic Arts Inc.
**
**  This program is free software: you can redistribute it and/or modify
**  it under the terms of the GNU General Public License as published by
**  the Free Software Foundation, either version 3 of the License, or
**  (at your option) any later version.
**
**  This program is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**  GNU General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#include"loadbmp.h"
 
 
LoadBmp::LoadBmp()
{
  BitmapHandle_=NULL;
  PalHandle_=NULL;
}
 
LoadBmp::~LoadBmp()
{
  // free resources
  DeleteObject(BitmapHandle_);
  DeleteObject(PalHandle_);
}
 
//
//  Load a specified bitmap for later display on a window
//
bit8 LoadBmp::init(char *filename,HWND hwnd)
{
  int                  i;
  HANDLE               hBitmapFile;
  DWORD                dwRead;
  BITMAPFILEHEADER     bitmapHeader;
  BITMAPINFOHEADER     bitmapInfoHeader;
  LPLOGPALETTE         lpLogPalette;
  char                *palData;
  HGLOBAL              hmem2;
  LPVOID               lpvBits;
  HDC                  hdc;
  HPALETTE             select;
  UINT                 realize;
  RECT                 rect;
 
 
  // Set the member for future reference
  WindowHandle_=hwnd;
 
  // Retrieve a handle identifying the file. 
  hBitmapFile = CreateFile(
    filename,
    GENERIC_READ, 
    FILE_SHARE_READ,
    (LPSECURITY_ATTRIBUTES) NULL, 
    OPEN_EXISTING,
    FILE_ATTRIBUTE_READONLY, 
    (HANDLE) NULL); 
 
  if (hBitmapFile==NULL)
    return(FALSE);
 
  // Retrieve the BITMAPFILEHEADER structure. 
  ReadFile(hBitmapFile, &bitmapHeader, sizeof(BITMAPFILEHEADER), &dwRead, 
    (LPOVERLAPPED)NULL); 
 
 
  // Retrieve the BITMAPFILEHEADER structure. 
  ReadFile(hBitmapFile, &bitmapInfoHeader, sizeof(BITMAPINFOHEADER), 
    &dwRead, (LPOVERLAPPED)NULL); 
 
 
  // Allocate memory for the BITMAPINFO structure. 
  HGLOBAL infoHeaderMem = GlobalAlloc(GHND, sizeof(BITMAPINFOHEADER) + 
    ((1<<bitmapInfoHeader.biBitCount) * sizeof(RGBQUAD))); 
 
  LPBITMAPINFO lpHeaderMem = (LPBITMAPINFO)GlobalLock(infoHeaderMem); 
 
  // Load BITMAPINFOHEADER into the BITMAPINFO structure. 
  lpHeaderMem->bmiHeader.biSize          = bitmapInfoHeader.biSize; 
  lpHeaderMem->bmiHeader.biWidth         = bitmapInfoHeader.biWidth; 
  lpHeaderMem->bmiHeader.biHeight        = bitmapInfoHeader.biHeight; 
  lpHeaderMem->bmiHeader.biPlanes        = bitmapInfoHeader.biPlanes; 
  lpHeaderMem->bmiHeader.biBitCount      = bitmapInfoHeader.biBitCount; 
  lpHeaderMem->bmiHeader.biCompression   = bitmapInfoHeader.biCompression; 
  lpHeaderMem->bmiHeader.biSizeImage     = bitmapInfoHeader.biSizeImage; 
  lpHeaderMem->bmiHeader.biXPelsPerMeter = bitmapInfoHeader.biXPelsPerMeter; 
  lpHeaderMem->bmiHeader.biYPelsPerMeter = bitmapInfoHeader.biYPelsPerMeter; 
  lpHeaderMem->bmiHeader.biClrUsed       = bitmapInfoHeader.biClrUsed; 
  lpHeaderMem->bmiHeader.biClrImportant  = bitmapInfoHeader.biClrImportant; 
 
 
  // Retrieve the color table. 
  // 1 << bitmapInfoHeader.biBitCount == 2 ^ bitmapInfoHeader.biBitCount 
  ReadFile(hBitmapFile, lpHeaderMem->bmiColors, 
    ((1<<bitmapInfoHeader.biBitCount) * sizeof(RGBQUAD)), 
    &dwRead, (LPOVERLAPPED) NULL); 
 
 
  lpLogPalette=(LPLOGPALETTE)new char[(sizeof(LOGPALETTE)+
      sizeof(PALETTEENTRY)*256)];
  lpLogPalette->palVersion=0x300;
  lpLogPalette->palNumEntries=256;
 
  palData=(char *)lpHeaderMem->bmiColors;
 
  for (i=0; i<256; i++)
  {
    lpLogPalette->palPalEntry[i].peRed=*palData++;
    lpLogPalette->palPalEntry[i].peGreen=*palData++;
    lpLogPalette->palPalEntry[i].peBlue=*palData++;
    lpLogPalette->palPalEntry[i].peFlags=*palData++;
  }
  PalHandle_=CreatePalette(lpLogPalette);
  delete(lpLogPalette);
 
 
  // Allocate memory for the required number of bytes. 
  hmem2 = GlobalAlloc(GHND, (bitmapHeader.bfSize - bitmapHeader.bfOffBits)); 
 
  lpvBits = GlobalLock(hmem2); 
 
  // Retrieve the bitmap data. 
  ReadFile(hBitmapFile, lpvBits, (bitmapHeader.bfSize - bitmapHeader.bfOffBits), 
    &dwRead, (LPOVERLAPPED) NULL); 
 
 
  // Create a bitmap from the data stored in the .BMP file. 
  hdc=GetDC(hwnd);
  select=SelectPalette(hdc,PalHandle_,0);
  if (select==NULL)
    return(FALSE);
  realize=RealizePalette(hdc);
  if (realize==GDI_ERROR)
    return(FALSE);
  BitmapHandle_=CreateDIBitmap(hdc, &bitmapInfoHeader, CBM_INIT, lpvBits, lpHeaderMem, DIB_RGB_COLORS); 
  ReleaseDC(hwnd,hdc);
 
 
  if (BitmapHandle_==NULL)
    return(FALSE);
 
  // Unlock the global memory objects and close the .BMP file.  
  GlobalUnlock(infoHeaderMem); 
  GlobalUnlock(hmem2); 
  CloseHandle(hBitmapFile); 
 
  if (BitmapHandle_==NULL) 
    return(FALSE);
 
  // Inform windows the window needs to be repainted
  GetClientRect(hwnd, &rect); 
  InvalidateRect(hwnd, &rect, TRUE); 
  UpdateWindow(hwnd); 
 
  return(TRUE);
}
 
 
bit8 LoadBmp::drawBmp(void)
{
  // Paint the window (and draw the bitmap). 
 
  PAINTSTRUCT ps;
  HDC         hdc;
  char        string[128];
 
  if (BitmapHandle_ == NULL)    // NAK - new
    return(FALSE);
 
  InvalidateRect(WindowHandle_,NULL,FALSE); // keep windows from screwing up the
                                           //  redrawing (as much).
  hdc=BeginPaint(WindowHandle_,&ps);
 
  //Do palette stuff
  HPALETTE select=SelectPalette(ps.hdc,PalHandle_,0);
  if (select==NULL)
  {
    sprintf(string,"Select Pal Fail: %d",GetLastError());
    MessageBox(NULL,string,"OK",MB_OK);
  }
  UINT realize=RealizePalette(ps.hdc);
  if (realize==GDI_ERROR)
  {
    sprintf(string,"Realize Pal Fail: %d",GetLastError());
    MessageBox(NULL,string,"OK",MB_OK);
  }
 
  HDC hdcMem = CreateCompatibleDC(ps.hdc); 
  SelectObject(hdcMem, BitmapHandle_); 
  BITMAP bm;
  GetObject(BitmapHandle_, sizeof(BITMAP), (LPSTR) &bm);
  
 
  RECT clientRect;
  GetClientRect(WindowHandle_,&clientRect);
  SetStretchBltMode(ps.hdc,COLORONCOLOR);
  StretchBlt(ps.hdc,0,0,clientRect.right,clientRect.bottom,hdcMem,0,0,bm.bmWidth,
    bm.bmHeight,SRCCOPY);
 
 
  DeleteDC(hdcMem); 
  EndPaint(WindowHandle_,&ps);
  return(TRUE);
}