src/msw/dib.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/dib.cpp
   3 // Purpose:     implements wxDIB class
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     03.03.03 (replaces the old file with the same name)
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
   9 // License:     wxWindows license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #ifndef WX_PRECOMP
  28     #include "wx/string.h"
  29     #include "wx/log.h"
  30 #endif //WX_PRECOMP
  31
  32 #include "wx/image.h"
  33
  34 #include "wx/msw/dib.h"
  35
  36 // ============================================================================
  37 // implementation
  38 // ============================================================================
  39
  40 // ----------------------------------------------------------------------------
  41 // wxDIB creation
  42 // ----------------------------------------------------------------------------
  43
  44 bool wxDIB::Create(int width, int height, int depth)
  45 {
  46     // we don't handle the palette yet
  47     wxASSERT_MSG( depth == 24 || depth == 32,
  48                     _T("unsupported image depth in wxDIB::Create()") );
  49
  50     static const int infosize = sizeof(BITMAPINFOHEADER);
  51
  52     BITMAPINFO *info = (BITMAPINFO *)malloc(infosize);
  53     wxCHECK_MSG( info, NULL, _T("malloc(BITMAPINFO) failed") );
  54
  55     memset(info, 0, infosize);
  56
  57     info->bmiHeader.biSize = infosize;
  58     info->bmiHeader.biWidth = width;
  59     info->bmiHeader.biHeight = -height;
  60     info->bmiHeader.biPlanes = 1;
  61     info->bmiHeader.biBitCount = depth;
  62     info->bmiHeader.biCompression = BI_RGB;
  63     info->bmiHeader.biSizeImage = GetLineSize(width, depth)*height;
  64
  65     // No need to report an error here.  If it fails, we just won't use a
  66     // file mapping and CreateDIBSection will just allocate memory for us.
  67     m_handle = ::CreateDIBSection
  68                  (
  69                     0,              // hdc (unused with DIB_RGB_COLORS)
  70                     info,           // bitmap description
  71                     DIB_RGB_COLORS, // use RGB, not palette
  72                     &m_data,        // [out] DIB bits
  73                     NULL,           // don't use file mapping
  74                     0               // file mapping offset (not used here)
  75                  );
  76
  77     free(info);
  78
  79     if ( !m_handle )
  80     {
  81         wxLogLastError(wxT("CreateDIBSection"));
  82
  83         return false;
  84     }
  85
  86     m_width = width;
  87     m_height = height;
  88     m_depth = depth;
  89
  90     return true;
  91 }
  92
  93 // ----------------------------------------------------------------------------
  94 // wxDIB accessors
  95 // ----------------------------------------------------------------------------
  96
  97 void wxDIB::DoGetObject() const
  98 {
  99     // only do something if we have a valid DIB but we don't [yet] have valid
 100     // data
 101     if ( m_handle && !m_data )
 102     {
 103         // although all the info we need is in BITMAP and so we don't really
 104         // need DIBSECTION we still ask for it as modifying the bit values only
 105         // works for the real DIBs and not for the bitmaps and it's better to
 106         // check for this now rather than trying to find out why it doesn't
 107         // work later
 108         DIBSECTION ds;
 109         if ( !::GetObject(m_handle, sizeof(ds), &ds) )
 110         {
 111             wxLogLastError(_T("GetObject(hDIB)"));
 112
 113             return;
 114         }
 115
 116         wxDIB *self = wxConstCast(this, wxDIB);
 117
 118         self->m_width = ds.dsBm.bmWidth;
 119         self->m_height = ds.dsBm.bmHeight;
 120         self->m_depth = ds.dsBm.bmBitsPixel;
 121         self->m_data = ds.dsBm.bmBits;
 122     }
 123 }
 124
 125 // ----------------------------------------------------------------------------
 126 // wxImage support
 127 // ----------------------------------------------------------------------------
 128
 129 #if wxUSE_IMAGE
 130
 131 bool wxDIB::Create(const wxImage& image)
 132 {
 133     wxCHECK_MSG( image.Ok(), false, _T("invalid wxImage in wxDIB ctor") );
 134
 135     const int h = image.GetHeight();
 136     const int w = image.GetWidth();
 137
 138     // if we have alpha channel, we need to create a 32bpp RGBA DIB, otherwise
 139     // a 24bpp RGB is sufficient
 140     const bool hasAlpha = image.HasAlpha();
 141     const int bpp = hasAlpha ? 32 : 24;
 142
 143     if ( !Create(w, h, bpp) )
 144         return false;
 145
 146     // DIBs are stored in bottom to top order so we need to copy bits line by
 147     // line and starting from the end
 148     const int srcBytesPerLine = w * 3;
 149     const int dstBytesPerLine = GetLineSize(w, bpp);
 150     const unsigned char *src = image.GetData() + ((h - 1) * srcBytesPerLine);
 151     const unsigned char *alpha = hasAlpha ? image.GetAlpha() + (h - 1)*w : NULL;
 152     unsigned char *dstLineStart = (unsigned char *)m_data;
 153     for ( int y = 0; y < h; y++ )
 154     {
 155         // copy one DIB line
 156         unsigned char *dst = dstLineStart;
 157         for ( int x = 0; x < w; x++ )
 158         {
 159             // also, the order of RGB is inversed for DIBs
 160             *dst++ = src[2];
 161             *dst++ = src[1];
 162             *dst++ = src[0];
 163
 164             src += 3;
 165
 166             if ( alpha )
 167                 *dst++ = *alpha++;
 168         }
 169
 170         // pass to the previous line in the image
 171         src -= 2*srcBytesPerLine;
 172         if ( alpha )
 173             alpha -= 2*w;
 174
 175         // and to the next one in the DIB
 176         dstLineStart += dstBytesPerLine;
 177     }
 178
 179     return true;
 180 }
 181
 182 #endif // wxUSE_IMAGE
 183
 184 // ============================================================================
 185 // old DIB code, to be integrated in wxDIB class
 186 // ============================================================================
 187
 188 /*******************************************************************************
 189  *                                                                               *
 190  * MODULE        : DIB.CC                                                        *
 191  *                                                                               *
 192  *  DESCRIPTION : Routines for dealing with Device Independent Bitmaps.        *
 193  *                                                                               *
 194  *  FUNCTIONS        :                                                              *
 195  *                                                                               *
 196  *                wxReadDIB()           - Reads a DIB                            *
 197  *                                                                               *
 198  *                  WriteDIB()              - Writes a global handle in CF_DIB format*
 199  *                                        to a file.                               *
 200  *                                                                               *
 201  *                  wxPaletteSize()       - Calculates the palette size in bytes   *
 202  *                                        of given DIB                               *
 203  *                                                                               *
 204  *                  DibNumColors()      - Determines the number of colors in DIB *
 205  *                                                                               *
 206  *                  DibFromBitmap()     - Creates a DIB repr. the DDB passed in. *
 207  *                                                                               *
 208  *                                                                               *
 209  *                  lread()              - Private routine to read more than 64k  *
 210  *                                                                               *
 211  *                  lwrite()              - Private routine to write more than 64k *
 212  *                                                                               *
 213  *******************************************************************************/
 214
 215 // For compilers that support precompilation, includes "wx.h".
 216 #include "wx/wxprec.h"
 217
 218 #if defined(__BORLANDC__)
 219 #pragma hdrstop
 220 #endif
 221
 222 #ifndef WX_PRECOMP
 223 #include "wx/bitmap.h"
 224 #include "wx/log.h"
 225 #include "wx/intl.h"
 226 #endif
 227
 228 #include <windows.h>
 229 #include <stdio.h>
 230 #include <stdlib.h>
 231
 232 #if !defined(__MWERKS__) && !defined(__SALFORDC__)
 233 #include <memory.h>
 234 #endif
 235
 236 #include "wx/msw/dib.h"
 237
 238 #ifdef __GNUWIN32_OLD__
 239     #include "wx/msw/gnuwin32/extra.h"
 240 #endif
 241
 242 #ifndef SEEK_CUR
 243 /* flags for _lseek */
 244 #define        SEEK_CUR 1
 245 #define        SEEK_END 2
 246 #define        SEEK_SET 0
 247 #endif
 248
 249 #define MAXREAD  32768                                 /* Number of bytes to be read during */
 250                                                  /* each read operation.                         */
 251
 252 /* Header signatutes for various resources */
 253 #define BFT_ICON         0x4349         /* 'IC' */
 254 #define BFT_BITMAP 0x4d42         /* 'BM' */
 255 #define BFT_CURSOR 0x5450         /* 'PT(' */
 256
 257 /* macro to determine if resource is a DIB */
 258 #define ISDIB(bft) ((bft) == BFT_BITMAP)
 259
 260 /* Macro to align given value to the closest DWORD (unsigned long ) */
 261 #define ALIGNULONG(i)        ((i+3)/4*4)
 262
 263 /* Macro to determine to round off the given value to the closest byte */
 264 #define WIDTHBYTES(i)        ((i+31)/32*4)
 265
 266 #define PALVERSION                0x300
 267 #define MAXPALETTE        256          /* max. # supported palette entries */
 268
 269 static DWORD PASCAL lread(int fh, VOID FAR *pv, DWORD ul);
 270 static DWORD PASCAL lwrite(int fh, VOID FAR *pv, DWORD ul);
 271
 272 static BOOL        WriteDIB (LPTSTR szFile,HANDLE hdib);
 273 WORD        wxPaletteSize (VOID FAR * pv); // This is non-static as some apps use it externally
 274 static WORD        DibNumColors (VOID FAR * pv);
 275 // HANDLE        DibFromBitmap (HBITMAP hbm, DWORD biStyle, WORD biBits, HPALETTE hpal);
 276 static BOOL PASCAL MakeBitmapAndPalette(HDC,HANDLE,HPALETTE *,HBITMAP *);
 277
 278 /****************************************************************************
 279  *                                                                            *
 280  *  FUNCTION   : WriteDIB(LPSTR szFile,HANDLE hdib)                            *
 281  *                                                                            *
 282  *  PURPOSE    : Write a global handle in CF_DIB format to a file.            *
 283  *                                                                            *
 284  *  RETURNS    : TRUE  - if successful.                                     *
 285  *                 FALSE - otherwise                                            *
 286  *                                                                            *
 287  ****************************************************************************/
 288
 289 static BOOL WriteDIB(LPTSTR szFile, HANDLE hdib)
 290 {
 291         BITMAPFILEHEADER        hdr;
 292         LPBITMAPINFOHEADER  lpbi;
 293         int                 fh;
 294         OFSTRUCT            of;
 295
 296         if (!hdib)
 297                 return FALSE;
 298
 299         fh = OpenFile(wxConvertWX2MB(szFile), &of, OF_CREATE | OF_READWRITE);
 300         if (fh == -1)
 301                 return FALSE;
 302
 303 #ifdef __WINDOWS_386__
 304         lpbi = (LPBITMAPINFOHEADER) MK_FP32(GlobalLock(hdib));
 305 #else
 306         lpbi = (LPBITMAPINFOHEADER) GlobalLock(hdib);
 307 #endif
 308     /* Fill in the fields of the file header */
 309         hdr.bfType = BFT_BITMAP;
 310         hdr.bfSize = GlobalSize(hdib) + sizeof(BITMAPFILEHEADER);
 311         hdr.bfReserved1 = 0;
 312         hdr.bfReserved2 = 0;
 313         hdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) + lpbi->biSize +
 314                  wxPaletteSize(lpbi);
 315
 316     /* Write the file header */
 317         _lwrite(fh, (LPSTR) &hdr, sizeof(BITMAPFILEHEADER));
 318
 319     /* Write the DIB header and the bits */
 320         lwrite(fh, (LPSTR) lpbi, GlobalSize(hdib));
 321
 322         GlobalUnlock(hdib);
 323         _lclose(fh);
 324         return TRUE;
 325 }
 326
 327 /****************************************************************************
 328  *                                                                            *
 329  *  FUNCTION   :  wxPaletteSize(VOID FAR * pv)                                    *
 330  *                                                                            *
 331  *  PURPOSE    :  Calculates the palette size in bytes. If the info. block  *
 332  *                  is of the BITMAPCOREHEADER type, the number of colors is  *
 333  *                  multiplied by 3 to give the palette size, otherwise the   *
 334  *                  number of colors is multiplied by 4.                                                                *
 335  *                                                                            *
 336  *  RETURNS    :  Palette size in number of bytes.                            *
 337  *                                                                            *
 338  ****************************************************************************/
 339
 340 WORD wxPaletteSize(VOID FAR * pv)
 341 {
 342         LPBITMAPINFOHEADER lpbi;
 343         WORD               NumColors;
 344
 345         lpbi = (LPBITMAPINFOHEADER) pv;
 346         NumColors = DibNumColors(lpbi);
 347
 348         if (lpbi->biSize == sizeof(BITMAPCOREHEADER))
 349                 return (WORD)(NumColors * sizeof(RGBTRIPLE));
 350         else
 351                 return (WORD)(NumColors * sizeof(RGBQUAD));
 352 }
 353
 354 /****************************************************************************
 355  *                                                                            *
 356  *  FUNCTION   : DibNumColors(VOID FAR * pv)                                    *
 357  *                                                                            *
 358  *  PURPOSE    : Determines the number of colors in the DIB by looking at   *
 359  *                 the BitCount filed in the info block.                            *
 360  *                                                                            *
 361  *  RETURNS    : The number of colors in the DIB.                            *
 362  *                                                                            *
 363  ****************************************************************************/
 364
 365 static WORD DibNumColors(VOID FAR *pv)
 366 {
 367         int                 bits;
 368         BITMAPINFOHEADER        *lpbi;
 369         BITMAPCOREHEADER        *lpbc;
 370
 371         lpbi = ((BITMAPINFOHEADER*) pv);
 372         lpbc = ((BITMAPCOREHEADER*) pv);
 373
 374     /*        With the BITMAPINFO format headers, the size of the palette
 375      *        is in biClrUsed, whereas in the BITMAPCORE - style headers, it
 376      *        is dependent on the bits per pixel ( = 2 raised to the power of
 377      *        bits/pixel).
 378      */
 379         if (lpbi->biSize != sizeof(BITMAPCOREHEADER)) {
 380                 if (lpbi->biClrUsed != 0)
 381                         return (WORD) lpbi->biClrUsed;
 382                 bits = lpbi->biBitCount;
 383                 }
 384         else
 385                 bits = lpbc->bcBitCount;
 386
 387         switch (bits) {
 388   case 1:
 389                 return 2;
 390   case 4:
 391                 return 16;
 392   case 8:
 393                 return 256;
 394   default:
 395                 /* A 24 bitcount DIB has no color table */
 396                 return 0;
 397                 }
 398 }
 399
 400 /****************************************************************************
 401  *                                                                            *
 402  *  FUNCTION   : DibFromBitmap()                                            *
 403  *                                                                            *
 404  *  PURPOSE    : Will create a global memory block in DIB format that            *
 405  *                 represents the Device-dependent bitmap (DDB) passed in.    *
 406  *                                                                            *
 407  *  RETURNS    : A handle to the DIB                                            *
 408  *                                                                            *
 409  ****************************************************************************/
 410
 411 #if NOTHING
 412 static HANDLE DibFromBitmap(HBITMAP hbm, DWORD biStyle, WORD biBits, HPALETTE hpal)
 413 {
 414         BITMAP               bm;
 415         BITMAPINFOHEADER     bi;
 416         BITMAPINFOHEADER FAR *lpbi;
 417         DWORD                dwLen;
 418         HANDLE               hdib;
 419         HANDLE               h;
 420         HDC                  hdc;
 421
 422         if (!hbm)
 423                 return NULL;
 424
 425         if (hpal == NULL)
 426                 hpal = GetStockObject(DEFAULT_PALETTE);
 427
 428         GetObject(hbm, sizeof (bm), (LPSTR) &bm);
 429
 430         if (biBits == 0)
 431                 biBits = bm.bmPlanes * bm.bmBitsPixel;
 432
 433         bi.biSize = sizeof(BITMAPINFOHEADER);
 434         bi.biWidth = bm.bmWidth;
 435         bi.biHeight = bm.bmHeight;
 436         bi.biPlanes = 1;
 437         bi.biBitCount = biBits;
 438         bi.biCompression = biStyle;
 439         bi.biSizeImage = 0;
 440         bi.biXPelsPerMeter = 0;
 441         bi.biYPelsPerMeter = 0;
 442         bi.biClrUsed = 0;
 443         bi.biClrImportant = 0;
 444
 445         dwLen = bi.biSize + wxPaletteSize(&bi);
 446
 447         hdc = GetDC((HWND) NULL);
 448         hpal = SelectPalette(hdc, hpal, FALSE);
 449         RealizePalette(hdc);
 450
 451         hdib = GlobalAlloc(GHND, dwLen);
 452
 453         if (!hdib) {
 454                 SelectPalette(hdc, hpal, FALSE);
 455                 ReleaseDC(NULL, hdc);
 456                 return NULL;
 457                 }
 458
 459 #ifdef __WINDOWS_386__
 460         lpbi = (BITMAPINFOHEADER FAR *) MK_FP32(GlobalLock(hdib));
 461 #else
 462         lpbi = (BITMAPINFOHEADER FAR *) GlobalLock(hdib);
 463 #endif
 464
 465         *lpbi = bi;
 466
 467     /*        call GetDIBits with a NULL lpBits param, so it will calculate the
 468      *  biSizeImage field for us
 469      */
 470         GetDIBits(hdc, hbm, 0, (WORD) bi.biHeight,
 471                  NULL, (LPBITMAPINFO) lpbi, DIB_RGB_COLORS);
 472
 473         bi = *lpbi;
 474         GlobalUnlock(hdib);
 475
 476     /* If the driver did not fill in the biSizeImage field, make one up */
 477         if (bi.biSizeImage == 0) {
 478                 bi.biSizeImage = WIDTHBYTES((DWORD)bm.bmWidth * biBits) * bm.bmHeight;
 479
 480                 if (biStyle != BI_RGB)
 481                         bi.biSizeImage = (bi.biSizeImage * 3) / 2;
 482                 }
 483
 484     /*        realloc the buffer big enough to hold all the bits */
 485         dwLen = bi.biSize + wxPaletteSize(&bi) + bi.biSizeImage;
 486         if (h = GlobalReAlloc(hdib, dwLen, 0))
 487                 hdib = h;
 488         else {
 489                 GlobalFree(hdib);
 490                 hdib = NULL;
 491
 492                 SelectPalette(hdc, hpal, FALSE);
 493                 ReleaseDC(NULL, hdc);
 494                 return hdib;
 495                 }
 496
 497     /*        call GetDIBits with a NON-NULL lpBits param, and actualy get the
 498      *  bits this time
 499      */
 500 #ifdef __WINDOWS_386__
 501         lpbi = (BITMAPINFOHEADER FAR *) MK_FP32(GlobalLock(hdib));
 502 #else
 503         lpbi = (BITMAPINFOHEADER FAR *) GlobalLock(hdib);
 504 #endif
 505
 506         if (GetDIBits(hdc,
 507                  hbm,
 508                  0,
 509                  (WORD) bi.biHeight,
 510                  (LPSTR) lpbi + (WORD) lpbi->biSize + wxPaletteSize(lpbi),
 511                  (LPBITMAPINFO) lpbi, DIB_RGB_COLORS) == 0) {
 512                 GlobalUnlock(hdib);
 513                 hdib = NULL;
 514                 SelectPalette(hdc, hpal, FALSE);
 515                 ReleaseDC((HWND) NULL, hdc);
 516                 return NULL;
 517                 }
 518
 519         bi = *lpbi;
 520         GlobalUnlock(hdib);
 521
 522         SelectPalette(hdc, hpal, FALSE);
 523         ReleaseDC(NULL, hdc);
 524         return hdib;
 525 }
 526 #endif
 527
 528  /************* PRIVATE ROUTINES TO READ/WRITE MORE THAN 64K ***************/
 529 /****************************************************************************
 530  *                                                                            *
 531  *  FUNCTION   : lread(int fh, VOID FAR *pv, DWORD ul)                            *
 532  *                                                                            *
 533  *  PURPOSE    : Reads data in steps of 32k till all the data has been read.*
 534  *                                                                            *
 535  *  RETURNS    : 0 - If read did not proceed correctly.                     *
 536  *                 number of bytes read otherwise.                            *
 537  *                                                                            *
 538  ****************************************************************************/
 539
 540 static DWORD PASCAL lread(int fh, void far *pv, DWORD ul)
 541 {
 542         DWORD     ulT = ul;
 543 #if defined(WINNT) || defined(__WIN32__) || defined(__WIN32__)
 544         BYTE *hp = (BYTE *) pv;
 545 #else
 546         BYTE huge *hp = (BYTE huge *) pv;
 547 #endif
 548         while (ul > (DWORD) MAXREAD) {
 549                 if (_lread(fh, (LPSTR) hp, (WORD) MAXREAD) != MAXREAD)
 550                         return 0;
 551                 ul -= MAXREAD;
 552                 hp += MAXREAD;
 553                 }
 554         if (_lread(fh, (LPSTR) hp, (WXUINT) ul) != (WXUINT) ul)
 555                 return 0;
 556         return ulT;
 557 }
 558
 559 /****************************************************************************
 560  *                                                                            *
 561  *  FUNCTION   : lwrite(int fh, VOID FAR *pv, DWORD ul)                     *
 562  *                                                                            *
 563  *  PURPOSE    : Writes data in steps of 32k till all the data is written.  *
 564  *                                                                            *
 565  *  RETURNS    : 0 - If write did not proceed correctly.                    *
 566  *                 number of bytes written otherwise.                            *
 567  *                                                                            *
 568  ****************************************************************************/
 569
 570 static DWORD PASCAL lwrite(int fh, VOID FAR *pv, DWORD ul)
 571 {
 572         DWORD     ulT = ul;
 573 #if defined(WINNT) || defined(__WIN32__) || defined(__WIN32__)
 574         BYTE *hp = (BYTE *) pv;
 575 #else
 576         BYTE huge *hp = (BYTE huge *) pv;
 577 #endif
 578         while (ul > MAXREAD) {
 579                 if (_lwrite(fh, (LPSTR) hp, (WORD) MAXREAD) != MAXREAD)
 580                         return 0;
 581                 ul -= MAXREAD;
 582                 hp += MAXREAD;
 583                 }
 584         if (_lwrite(fh, (LPSTR) hp, (WXUINT) ul) != (WXUINT) ul)
 585                 return 0;
 586         return ulT;
 587 }
 588
 589 /****************************************************************************
 590  *
 591  *  FUNCTION   : ReadDIB(hWnd)
 592  *
 593  *  PURPOSE    : Reads a DIB from a file, obtains a handle to its
 594  *                 BITMAPINFO struct. and loads the DIB.  Once the DIB
 595  *               is loaded, the function also creates a bitmap and
 596  *               palette out of the DIB for a device-dependent form.
 597  *
 598  *  RETURNS    : TRUE  - DIB loaded and bitmap/palette created
 599  *                       The DIBINIT structure pointed to by pInfo is
 600  *                       filled with the appropriate handles.
 601  *                 FALSE - otherwise
 602  *
 603  ****************************************************************************/
 604 BOOL wxReadDIB(LPTSTR lpFileName, HBITMAP *bitmap, HPALETTE *palette)
 605 {
 606     int fh;
 607     LPBITMAPINFOHEADER lpbi;
 608     OFSTRUCT               of;
 609     BITMAPFILEHEADER   bf;
 610     WORD                nNumColors;
 611     BOOL result = FALSE;
 612     WORD offBits;
 613     HDC hDC;
 614     BOOL bCoreHead = FALSE;
 615     HANDLE hDIB = 0;
 616
 617     /* Open the file and get a handle to it's BITMAPINFO */
 618
 619     fh = OpenFile (wxConvertWX2MB(lpFileName), &of, OF_READ);
 620     if (fh == -1) {
 621         wxLogError(_("Can't open file '%s'"), lpFileName);
 622         return (0);
 623     }
 624
 625     hDIB = GlobalAlloc(GHND, (DWORD)(sizeof(BITMAPINFOHEADER) +
 626                                             256 * sizeof(RGBQUAD)));
 627     if (!hDIB)
 628         return(0);
 629
 630 #ifdef __WINDOWS_386__
 631     lpbi = (LPBITMAPINFOHEADER)MK_FP32(GlobalLock(hDIB));
 632 #else
 633     lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
 634 #endif
 635
 636     /* read the BITMAPFILEHEADER */
 637     if (sizeof (bf) != _lread (fh, (LPSTR)&bf, sizeof (bf)))
 638         goto ErrExit;
 639
 640     if (bf.bfType != 0x4d42)        /* 'BM' */
 641         goto ErrExit;
 642
 643     if (sizeof(BITMAPCOREHEADER) != _lread (fh, (LPSTR)lpbi, sizeof(BITMAPCOREHEADER)))
 644         goto ErrExit;
 645
 646     if (lpbi->biSize == sizeof(BITMAPCOREHEADER))
 647     {
 648         lpbi->biSize = sizeof(BITMAPINFOHEADER);
 649         lpbi->biBitCount = ((LPBITMAPCOREHEADER)lpbi)->bcBitCount;
 650         lpbi->biPlanes = ((LPBITMAPCOREHEADER)lpbi)->bcPlanes;
 651         lpbi->biHeight = ((LPBITMAPCOREHEADER)lpbi)->bcHeight;
 652         lpbi->biWidth = ((LPBITMAPCOREHEADER)lpbi)->bcWidth;
 653         bCoreHead = TRUE;
 654     }
 655     else
 656     {
 657             // get to the start of the header and read INFOHEADER
 658         _llseek(fh,sizeof(BITMAPFILEHEADER),SEEK_SET);
 659         if (sizeof(BITMAPINFOHEADER) != _lread (fh, (LPSTR)lpbi, sizeof(BITMAPINFOHEADER)))
 660             goto ErrExit;
 661     }
 662
 663     nNumColors = (WORD)lpbi->biClrUsed;
 664     if ( nNumColors == 0 )
 665     {
 666         /* no color table for 24-bit, default size otherwise */
 667         if (lpbi->biBitCount != 24)
 668             nNumColors = 1 << lpbi->biBitCount;        /* standard size table */
 669     }
 670
 671     /*        fill in some default values if they are zero */
 672     if (lpbi->biClrUsed == 0)
 673         lpbi->biClrUsed = nNumColors;
 674
 675     if (lpbi->biSizeImage == 0)
 676     {
 677         lpbi->biSizeImage = ((((lpbi->biWidth * (DWORD)lpbi->biBitCount) + 31) & ~31) >> 3)
 678                          * lpbi->biHeight;
 679     }
 680
 681     /* get a proper-sized buffer for header, color table and bits */
 682     GlobalUnlock(hDIB);
 683     hDIB = GlobalReAlloc(hDIB, lpbi->biSize +
 684                                             nNumColors * sizeof(RGBQUAD) +
 685                                         lpbi->biSizeImage, 0);
 686     if (!hDIB)        /* can't resize buffer for loading */
 687         goto ErrExit2;
 688
 689 #ifdef __WINDOWS_386__
 690     lpbi = (LPBITMAPINFOHEADER)MK_FP32(GlobalLock(hDIB));
 691 #else
 692     lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
 693 #endif
 694
 695     /* read the color table */
 696     if (!bCoreHead)
 697         _lread(fh, (LPSTR)(lpbi) + lpbi->biSize, nNumColors * sizeof(RGBQUAD));
 698     else
 699     {
 700         signed int i;
 701         RGBQUAD FAR *pQuad;
 702         RGBTRIPLE FAR *pTriple;
 703
 704         _lread(fh, (LPSTR)(lpbi) + lpbi->biSize, nNumColors * sizeof(RGBTRIPLE));
 705
 706         pQuad = (RGBQUAD FAR *)((LPSTR)lpbi + lpbi->biSize);
 707         pTriple = (RGBTRIPLE FAR *) pQuad;
 708         for (i = nNumColors - 1; i >= 0; i--)
 709         {
 710             pQuad[i].rgbRed = pTriple[i].rgbtRed;
 711             pQuad[i].rgbBlue = pTriple[i].rgbtBlue;
 712             pQuad[i].rgbGreen = pTriple[i].rgbtGreen;
 713             pQuad[i].rgbReserved = 0;
 714         }
 715     }
 716
 717     /* offset to the bits from start of DIB header */
 718     offBits = (WORD)(lpbi->biSize + nNumColors * sizeof(RGBQUAD));
 719
 720     if (bf.bfOffBits != 0L)
 721     {
 722         _llseek(fh,bf.bfOffBits,SEEK_SET);
 723     }
 724
 725     if (lpbi->biSizeImage == lread(fh, (LPSTR)lpbi + offBits, lpbi->biSizeImage))
 726     {
 727         GlobalUnlock(hDIB);
 728
 729         hDC = GetDC(NULL);
 730         if (!MakeBitmapAndPalette(hDC, hDIB, palette,
 731                                         bitmap))
 732         {
 733             ReleaseDC(NULL,hDC);
 734             goto ErrExit2;
 735         }
 736         else
 737         {
 738             ReleaseDC(NULL,hDC);
 739             GlobalFree(hDIB);
 740             result = TRUE;
 741         }
 742     }
 743     else
 744     {
 745 ErrExit:
 746         GlobalUnlock(hDIB);
 747 ErrExit2:
 748         GlobalFree(hDIB);
 749     }
 750
 751     _lclose(fh);
 752     return(result);
 753 }
 754
 755 /****************************************************************************
 756  *
 757  *  FUNCTION   : MakeBitmapAndPalette
 758  *
 759  *  PURPOSE    : Given a DIB, creates a bitmap and corresponding palette
 760  *               to be used for a device-dependent representation of
 761  *               of the image.
 762  *
 763  *  RETURNS    : TRUE  --> success. phPal and phBitmap are filled with
 764  *                         appropriate handles.  Caller is responsible
 765  *                         for freeing objects.
 766  *               FALSE --> unable to create objects.  both pointer are
 767  *                         not valid
 768  *
 769  ****************************************************************************/
 770 static BOOL PASCAL MakeBitmapAndPalette(HDC hDC, HANDLE hDIB,
 771                         HPALETTE * phPal, HBITMAP * phBitmap)
 772 {
 773     LPBITMAPINFOHEADER lpInfo;
 774     BOOL result = FALSE;
 775     HBITMAP hBitmap;
 776     HPALETTE hPalette, hOldPal;
 777     LPSTR lpBits;
 778
 779 #ifdef __WINDOWS_386__
 780     lpInfo = (LPBITMAPINFOHEADER) MK_FP32(GlobalLock(hDIB));
 781 #else
 782     lpInfo = (LPBITMAPINFOHEADER) GlobalLock(hDIB);
 783 #endif
 784
 785     hPalette = wxMakeDIBPalette(lpInfo);
 786     if ( hPalette )
 787     {
 788         // Need to realize palette for converting DIB to bitmap.
 789         hOldPal = SelectPalette(hDC, hPalette, TRUE);
 790         RealizePalette(hDC);
 791
 792         lpBits = (LPSTR)lpInfo + (WORD)lpInfo->biSize +
 793                 (WORD)lpInfo->biClrUsed * sizeof(RGBQUAD);
 794         hBitmap = CreateDIBitmap(hDC, lpInfo, CBM_INIT, lpBits,
 795                                 (LPBITMAPINFO)lpInfo, DIB_RGB_COLORS);
 796
 797         SelectPalette(hDC, hOldPal, TRUE);
 798         RealizePalette(hDC);
 799
 800         if (!hBitmap)
 801             DeleteObject(hPalette);
 802         else
 803         {
 804             *phBitmap = hBitmap;
 805             *phPal = hPalette;
 806             result = TRUE;
 807         }
 808     }
 809
 810         GlobalUnlock (hDIB);  // glt
 811
 812     return(result);
 813 }
 814
 815 /****************************************************************************
 816  *                                                                            *
 817  *  FUNCTION   : wxMakeDIBPalette(lpInfo)                                            *
 818  *                                                                            *
 819  *  PURPOSE    : Given a BITMAPINFOHEADER, create a palette based on
 820  *                 the color table.
 821  *
 822  *                                                                            *
 823  *  RETURNS    : non-zero - handle of a corresponding palette
 824  *                 zero - unable to create palette
 825  *                                                                            *
 826  ****************************************************************************/
 827 HPALETTE wxMakeDIBPalette(LPBITMAPINFOHEADER lpInfo)
 828 {
 829     LPLOGPALETTE npPal;
 830     RGBQUAD far *lpRGB;
 831     HPALETTE hLogPal;
 832     WORD i;
 833
 834     /* since biClrUsed field was filled during the loading of the DIB,
 835     ** we know it contains the number of colors in the color table.
 836     */
 837     if (lpInfo->biClrUsed)
 838     {
 839 /*
 840         npPal = (NPLOGPALETTE)LocalAlloc(LMEM_FIXED, sizeof(LOGPALETTE) +
 841                                 (WORD)lpInfo->biClrUsed * sizeof(PALETTEENTRY));
 842 */
 843         npPal = (LPLOGPALETTE)malloc(sizeof(LOGPALETTE) +
 844                                 (WORD)lpInfo->biClrUsed * sizeof(PALETTEENTRY));
 845         if (!npPal)
 846             return NULL;
 847
 848         npPal->palVersion = 0x300;
 849         npPal->palNumEntries = (WORD)lpInfo->biClrUsed;
 850
 851         /* get pointer to the color table */
 852         lpRGB = (RGBQUAD FAR *)((LPSTR)lpInfo + lpInfo->biSize);
 853
 854         /* copy colors from the color table to the LogPalette structure */
 855         for (i = 0; (DWORD)i < lpInfo->biClrUsed; i++, lpRGB++)
 856         {
 857             npPal->palPalEntry[i].peRed = lpRGB->rgbRed;
 858             npPal->palPalEntry[i].peGreen = lpRGB->rgbGreen;
 859             npPal->palPalEntry[i].peBlue = lpRGB->rgbBlue;
 860             npPal->palPalEntry[i].peFlags = 0;
 861         }
 862
 863         hLogPal = CreatePalette((LPLOGPALETTE)npPal);
 864 //        LocalFree((HANDLE)npPal);
 865         free(npPal);
 866
 867         return(hLogPal);
 868     }
 869
 870     /* 24-bit DIB with no color table.  return default palette.  Another
 871     ** option would be to create a 256 color "rainbow" palette to provide
 872     ** some good color choices.
 873     */
 874     else
 875         return((HPALETTE) GetStockObject(DEFAULT_PALETTE));
 876 }
 877
 878 bool wxLoadIntoBitmap(wxChar *filename, wxBitmap *bitmap, wxPalette **pal)
 879 {
 880   HBITMAP hBitmap = NULL;
 881   HPALETTE hPalette = NULL;
 882
 883   bool success = (wxReadDIB(filename, &hBitmap, &hPalette) != 0);
 884
 885   if (!success)
 886   {
 887     if (hPalette)
 888         DeleteObject(hPalette);
 889     return FALSE;
 890   }
 891
 892   if (hPalette)
 893   {
 894 #if wxUSE_PALETTE
 895     if (pal)
 896     {
 897       *pal = new wxPalette;
 898       (*pal)->SetHPALETTE((WXHPALETTE) hPalette);
 899     }
 900     else
 901 #endif // wxUSE_PALETTE
 902       DeleteObject(hPalette);
 903   }
 904   else if (pal)
 905     *pal = NULL;
 906
 907   if (hBitmap)
 908   {
 909     BITMAP bm;
 910     GetObject(hBitmap, sizeof(bm), (LPSTR)&bm);
 911
 912     bitmap->SetHBITMAP((WXHBITMAP) hBitmap);
 913     bitmap->SetWidth(bm.bmWidth);
 914     bitmap->SetHeight(bm.bmHeight);
 915     bitmap->SetDepth(bm.bmPlanes * bm.bmBitsPixel);
 916 #if WXWIN_COMPATIBILITY_2
 917     bitmap->SetOk(TRUE);
 918 #endif // WXWIN_COMPATIBILITY_2
 919     return TRUE;
 920   }
 921   else return FALSE;
 922 }
 923
 924 wxBitmap *wxLoadBitmap(wxChar *filename, wxPalette **pal)
 925 {
 926   wxBitmap *bitmap = new wxBitmap;
 927   if (wxLoadIntoBitmap(filename, bitmap, pal))
 928     return bitmap;
 929   else
 930   {
 931     delete bitmap;
 932     return NULL;
 933   }
 934 }
 935
 936 //---------------------------------------------------------------------
 937 //
 938 // Function:   InitBitmapInfoHeader
 939 //
 940 // Purpose:    Does a "standard" initialization of a BITMAPINFOHEADER,
 941 //             given the Width, Height, and Bits per Pixel for the
 942 //             DIB.
 943 //
 944 //             By standard, I mean that all the relevant fields are set
 945 //             to the specified values.  biSizeImage is computed, the
 946 //             biCompression field is set to "no compression," and all
 947 //             other fields are 0.
 948 //
 949 //             Note that DIBs only allow BitsPixel values of 1, 4, 8, or
 950 //             24.  This routine makes sure that one of these values is
 951 //             used (whichever is most appropriate for the specified
 952 //             nBPP).
 953 //
 954 // Parms:      lpBmInfoHdr == Far pointer to a BITMAPINFOHEADER structure
 955 //                            to be filled in.
 956 //             dwWidth     == Width of DIB (not in Win 3.0 & 3.1, high
 957 //                            word MUST be 0).
 958 //             dwHeight    == Height of DIB (not in Win 3.0 & 3.1, high
 959 //                            word MUST be 0).
 960 //             nBPP        == Bits per Pixel for the DIB.
 961 //
 962 // History:   Date      Reason
 963 //            11/07/91  Created
 964 //
 965 //---------------------------------------------------------------------
 966
 967 static void InitBitmapInfoHeader (LPBITMAPINFOHEADER lpBmInfoHdr,
 968                                         DWORD dwWidth,
 969                                         DWORD dwHeight,
 970                                           int nBPP)
 971 {
 972 //   _fmemset (lpBmInfoHdr, 0, sizeof (BITMAPINFOHEADER));
 973    memset (lpBmInfoHdr, 0, sizeof (BITMAPINFOHEADER));
 974
 975    lpBmInfoHdr->biSize      = sizeof (BITMAPINFOHEADER);
 976    lpBmInfoHdr->biWidth     = dwWidth;
 977    lpBmInfoHdr->biHeight    = dwHeight;
 978    lpBmInfoHdr->biPlanes    = 1;
 979
 980    if (nBPP <= 1)
 981       nBPP = 1;
 982    else if (nBPP <= 4)
 983       nBPP = 4;
 984    else if (nBPP <= 8)
 985       nBPP = 8;
 986 /* Doesn't work
 987    else if (nBPP <= 16)
 988       nBPP = 16;
 989 */
 990    else
 991       nBPP = 24;
 992
 993    lpBmInfoHdr->biBitCount  = nBPP;
 994    lpBmInfoHdr->biSizeImage = WIDTHBYTES (dwWidth * nBPP) * dwHeight;
 995 }
 996
 997
 998
 999
1000 LPSTR wxFindDIBBits (LPSTR lpbi)
1001 {
1002    return (lpbi + *(LPDWORD)lpbi + wxPaletteSize (lpbi));
1003 }
1004
1005 //---------------------------------------------------------------------
1006 //
1007 // Function:   BitmapToDIB
1008 //
1009 // Purpose:    Given a device dependent bitmap and a palette, returns
1010 //             a handle to global memory with a DIB spec in it.  The
1011 //             DIB is rendered using the colors of the palette passed in.
1012 //
1013 //             Stolen almost verbatim from ShowDIB.
1014 //
1015 // Parms:      hBitmap == Handle to device dependent bitmap compatible
1016 //                        with default screen display device.
1017 //             hPal    == Palette to render the DDB with.  If it's NULL,
1018 //                        use the default palette.
1019 //
1020 // History:   Date      Reason
1021 //             6/01/91  Created
1022 //
1023 //---------------------------------------------------------------------
1024
1025 HANDLE wxBitmapToDIB (HBITMAP hBitmap, HPALETTE hPal)
1026 {
1027    BITMAP             Bitmap;
1028    BITMAPINFOHEADER   bmInfoHdr;
1029    LPBITMAPINFOHEADER lpbmInfoHdr;
1030    LPSTR              lpBits;
1031    HDC                hMemDC;
1032    HANDLE             hDIB;
1033    HPALETTE           hOldPal = NULL;
1034
1035       // Do some setup -- make sure the Bitmap passed in is valid,
1036       //  get info on the bitmap (like its height, width, etc.),
1037       //  then setup a BITMAPINFOHEADER.
1038
1039    if (!hBitmap)
1040       return NULL;
1041
1042    if (!GetObject (hBitmap, sizeof (Bitmap), (LPSTR) &Bitmap))
1043       return NULL;
1044
1045    InitBitmapInfoHeader (&bmInfoHdr,
1046                          Bitmap.bmWidth,
1047                          Bitmap.bmHeight,
1048                          Bitmap.bmPlanes * Bitmap.bmBitsPixel);
1049
1050
1051       // Now allocate memory for the DIB.  Then, set the BITMAPINFOHEADER
1052       //  into this memory, and find out where the bitmap bits go.
1053
1054    hDIB = GlobalAlloc (GHND, sizeof (BITMAPINFOHEADER) +
1055              wxPaletteSize ((LPSTR) &bmInfoHdr) + bmInfoHdr.biSizeImage);
1056
1057    if (!hDIB)
1058       return NULL;
1059
1060 #ifdef __WINDOWS_386__
1061    lpbmInfoHdr  = (LPBITMAPINFOHEADER) MK_FP32(GlobalLock (hDIB));
1062 #else
1063    lpbmInfoHdr  = (LPBITMAPINFOHEADER) GlobalLock (hDIB);
1064 #endif
1065
1066    *lpbmInfoHdr = bmInfoHdr;
1067    lpBits       = wxFindDIBBits ((LPSTR) lpbmInfoHdr);
1068
1069
1070       // Now, we need a DC to hold our bitmap.  If the app passed us
1071       //  a palette, it should be selected into the DC.
1072
1073    hMemDC       = GetDC (NULL);
1074
1075    if (hPal)
1076       {
1077       hOldPal = SelectPalette (hMemDC, hPal, FALSE);
1078       RealizePalette (hMemDC);
1079       }
1080
1081
1082
1083       // We're finally ready to get the DIB.  Call the driver and let
1084       //  it party on our bitmap.  It will fill in the color table,
1085       //  and bitmap bits of our global memory block.
1086
1087    if (!GetDIBits (hMemDC,
1088                    hBitmap,
1089                    0,
1090                    Bitmap.bmHeight,
1091                    lpBits,
1092                    (LPBITMAPINFO) lpbmInfoHdr,
1093                    DIB_RGB_COLORS))
1094       {
1095       GlobalUnlock (hDIB);
1096       GlobalFree (hDIB);
1097       hDIB = NULL;
1098       }
1099    else
1100       GlobalUnlock (hDIB);
1101
1102
1103       // Finally, clean up and return.
1104
1105    if (hOldPal)
1106       SelectPalette (hMemDC, hOldPal, FALSE);
1107
1108    ReleaseDC (NULL, hMemDC);
1109
1110    return hDIB;
1111 }
1112
1113 bool wxSaveBitmap(wxChar *filename, wxBitmap *bitmap, wxPalette *colourmap)
1114 {
1115   HPALETTE hPalette = 0;
1116 #if wxUSE_PALETTE
1117   if (colourmap)
1118     hPalette = (HPALETTE) colourmap->GetHPALETTE();
1119 #endif // wxUSE_PALETTE
1120
1121   HANDLE dibHandle = wxBitmapToDIB((HBITMAP) bitmap->GetHBITMAP(), hPalette);
1122   if (dibHandle)
1123   {
1124     bool success = (WriteDIB(filename, dibHandle) != 0);
1125     GlobalFree(dibHandle);
1126     return success;
1127   }
1128   else return FALSE;
1129 }
1130