Initial import. Contains the im, cd and iup librairies, and a "working" Makefile for them under linux.

1 files changed, 1136 insertions, 0 deletions

diff --git a/im/src/im_dib.cpp b/im/src/im_dib.cpp
new file mode 100755
index 0000000..3dd6780
--- /dev/null
+++ b/im/src/im_dib.cpp
@@ -0,0 +1,1136 @@
+/** \file
+ * \brief Windows DIB
+ *
+ * See Copyright Notice in im_lib.h
+ * $Id: im_dib.cpp,v 1.1 2008/10/17 06:10:16 scuri Exp $
+ */
+
+
+#include <windows.h>
+#include <assert.h>
+#include <stdlib.h>
+
+#include "im_dib.h"
+
+/*****************
+  Private Funtions
+*****************/
+
+/* Long returned in getpixel is an array of 4 bytes, not actually a DWORD */
+/* 32 bpp max */
+/* Windows use Little Endian always, this means LSB first: 0xF3F2F1F0 = "F0F1F2F3" */
+
+#define iSETDWORD(_vLong, _Line, _Nb)                    \
+        {                                                  \
+          unsigned char* _pLong = (unsigned char*)&_vLong; \
+          int b = _Nb;                                     \
+          while(b--)                                       \
+            *_pLong++ = *_Line++;                          \
+        }
+
+#define iGETDWORD(_vLong, _Line, _Nb)                    \
+        {                                                  \
+          unsigned char* _pLong = (unsigned char*)&_vLong; \
+          int b = _Nb;                                     \
+          while(b--)                                       \
+            *_Line++ = *_pLong++;                          \
+        }
+
+#define iGETDWORDMASK(_vLong, _vMask, _Line, _Nb)        \
+        {                                                  \
+          unsigned char* _pLong = (unsigned char*)&_vLong; \
+          unsigned char* _pMask = (unsigned char*)&_vMask; \
+          int b = _Nb;                                     \
+          while(b--)                                       \
+            *_Line++ = *_pLong++ | (~*_pMask++ & *_Line);  \
+        }
+
+static unsigned int iMakeBitMask(int bpp)
+{
+  unsigned int mask = 1;
+
+  while (bpp > 1)
+  {
+    mask = (mask << 1) + 1;
+    bpp--;
+  }
+
+  return mask;
+}
+
+static unsigned int iLineGetPixel1(unsigned char* line, int col)
+{
+  return (line[col / 8] >> (7 - col % 8)) & 0x01;        /* LSB is filled */
+}
+
+static void iLineSetPixel1(unsigned char* line, int col, unsigned int pixel)
+{
+  if (pixel)                                             /* only test 1/0 */
+    line[col / 8] |= (0x01 << (7 - (col % 8)));
+  else
+    line[col / 8] &= (0xFE << (7 - (col % 8)));
+}
+
+static unsigned int iLineGetPixel4(unsigned char* line, int col)
+{
+  return (line[col / 2] >> ((1 - col % 2) * 4)) & 0x0F;  /* LSB is filled */
+}
+
+static void iLineSetPixel4(unsigned char* line, int col, unsigned int pixel)
+{
+  unsigned char mask = (col % 2)? 0xF0: 0x0F;            /* LSB is used */
+  line[col/2] = (unsigned char)((mask & (((unsigned char)pixel) << ((1 - col % 2) * 4))) | (~mask & line[col/2]));
+}
+
+static unsigned int iLineGetPixel8(unsigned char* line, int col)
+{
+  return line[col];                                      /* LSB is filled */
+}
+
+static void iLineSetPixel8(unsigned char* line, int col, unsigned int pixel)
+{
+  line[col] = (unsigned char)pixel;                      /* LSB is used */
+}
+
+static unsigned int iLineGetPixel16(unsigned char* line, int col)
+{
+  return ((unsigned short*)line)[col];                   /* 0xF1F0 => "F0F10000" */
+}
+
+static void iLineSetPixel16(unsigned char* line, int col, unsigned int pixel)
+{
+  ((unsigned short*)line)[col] = (unsigned short)pixel;  /* inverse of above */
+}
+
+static unsigned int iLineGetPixel24(unsigned char* line, int col)
+{
+  unsigned int pixel = 0;
+  line += col*3;
+  iSETDWORD(pixel, line, 3);
+  return pixel;
+}
+
+static void iLineSetPixel24(unsigned char* line, int col, unsigned int pixel)
+{
+  line += col*3;
+  iGETDWORD(pixel, line, 3);
+}
+
+static unsigned int iLineGetPixel32(unsigned char* line, int col)
+{
+  return ((unsigned int*)line)[col];                    /* direct mapping */
+}
+
+static void iLineSetPixel32(unsigned char* line, int col, unsigned int pixel)
+{
+  ((unsigned int*)line)[col] = pixel;                   /* direct mapping */
+}
+
+static int iGetPixelAnyBpp = 0;
+static unsigned int iGetPixelAnyMask = 0;
+
+static unsigned int iAnyGet(unsigned char* line, int col, int bpp)
+{
+  int s_byte = (col*bpp) >> 3;
+  int s_bit = (col*bpp) & 0x7;
+  unsigned int pixel = 0;
+  unsigned int mask = (~0) >> (32-bpp);
+  int n_bytes = (bpp + s_bit + 7) >> 3;
+  int shift = (n_bytes << 3) - bpp - s_bit;
+  line += s_byte;
+  while (n_bytes)
+  {
+    pixel |= *line++;
+    if (--n_bytes > 0) pixel <<= 8;
+    else break;
+  }
+  pixel >>= shift;
+  return pixel & mask;
+}
+
+static void iAnySet(unsigned char* line, int col, int bpp, unsigned int pixel)
+{
+  int s_byte = (col*bpp) >> 3;
+  int s_bit = (col*bpp) & 0x7;
+  unsigned int mask = (~0) >> (32-bpp);
+  int n_bytes = (bpp + s_bit + 7) >> 3;
+  int shift = (n_bytes << 3) - bpp - s_bit;
+  unsigned char* p_pixel = (unsigned char*) &pixel, *p_mask = (unsigned char*) &mask;
+  line += s_byte + n_bytes - 1;
+  pixel <<= shift;
+  mask <<= shift;
+  while (n_bytes--) {
+    *line = (*line & ~(*p_mask)) | (*p_pixel & *p_mask);
+    p_mask++; p_pixel++; line--;
+  }
+}
+
+static unsigned int iLineGetPixelAny(unsigned char* line, int col)
+{
+  return iAnyGet(line, col, iGetPixelAnyBpp);
+#if 0
+  unsigned int pixel = 0;
+  int rbits  = (col * iGetPixelAnyBpp) % 8;       /* calc remaining bits */
+  line      += (col * iGetPixelAnyBpp) / 8;       /* position pointer */
+
+  /* transfer from pixel line to a DWORD in little endian, so it can be shifted */
+  {
+    int nbytes = (iGetPixelAnyBpp + rbits + 7) / 8; /* bytes used */
+    iSETDWORD(pixel, line, nbytes);
+  }
+
+  /* shift down pixel remaining bits and mask extra non pixel bits */
+  return (pixel >> rbits) & iGetPixelAnyMask;
+#endif
+}
+
+static int iSetPixelAnyBpp = 0;
+static unsigned int iSetPixelAnyMask = 0;
+
+static void iLineSetPixelAny(unsigned char* line, int col, unsigned int pixel)
+{
+  iAnySet(line, col, iSetPixelAnyBpp, pixel);
+#if 0
+  int rbits  = (col * iSetPixelAnyBpp) % 8;       /* calc remaining bits */
+  line      += (col * iSetPixelAnyBpp) / 8;       /* position pointer */
+
+  pixel = pixel << rbits; /* position bits */
+
+  {
+    unsigned int mask = iSetPixelAnyMask << rbits; /* position mask */
+    int nbytes = (iGetPixelAnyBpp + rbits + 7) / 8; /* bytes used */
+    iGETDWORDMASK(pixel, mask, line, nbytes);
+  }                      
+#endif
+}
+
+static long iQuad2Long(RGBQUAD* quad_color)
+{
+  return (((unsigned long)quad_color->rgbRed) << 16) |
+         (((unsigned long)quad_color->rgbGreen) <<  8) |
+         (((unsigned long)quad_color->rgbBlue) <<  0);
+}
+
+static RGBQUAD iLong2Quad(long long_color)
+{
+  RGBQUAD quad_color;
+  
+  quad_color.rgbRed = (unsigned char)(((long_color) >> 16) & 0xFF);
+  quad_color.rgbGreen = (unsigned char)(((long_color) >>  8) & 0xFF);
+  quad_color.rgbBlue = (unsigned char)(((long_color) >>  0) & 0xFF);
+ 
+  return quad_color;
+}
+
+static int iImageLineSize(int width, int bpp)
+{
+  return (width * bpp + 7) / 8;            /* 1 byte boundary */
+}
+
+static int iLineSize(int width, int bpp)
+{
+  return ((width * bpp + 31) / 32) * 4;   /* 4 bytes boundary */
+}
+
+static void iInitHeadersReference(imDib* dib)
+{
+  dib->bmi = (BITMAPINFO*)dib->dib;
+  dib->bmih = (BITMAPINFOHEADER*)dib->dib;
+  dib->bmic = (RGBQUAD*)(dib->dib + sizeof(BITMAPINFOHEADER));
+}
+
+static void iInitSizes(imDib* dib, int width, int height, int bpp)
+{
+  dib->line_size = iLineSize(width, bpp);
+  dib->pad_size = dib->line_size - iImageLineSize(width, bpp);
+  dib->bits_size = dib->line_size * height;
+  dib->size = sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * dib->palette_count + dib->bits_size;
+}
+
+static void iInitInfoHeader(BITMAPINFOHEADER* bmih, int width, int height, int bpp, int palette_count)
+{
+  bmih->biSize = sizeof(BITMAPINFOHEADER);
+  bmih->biWidth = width;
+  bmih->biHeight = height;
+  bmih->biPlanes = 1;
+  bmih->biBitCount = (WORD)bpp;
+  bmih->biCompression = 0;
+  bmih->biSizeImage = 0;
+  bmih->biClrUsed = palette_count;
+  bmih->biClrImportant = 0;
+
+  {
+    HDC ScreenDC = GetDC(NULL);
+
+    bmih->biXPelsPerMeter = (unsigned int)(GetDeviceCaps(ScreenDC, LOGPIXELSX) / 0.0254);
+    bmih->biYPelsPerMeter = (unsigned int)(GetDeviceCaps(ScreenDC, LOGPIXELSY) / 0.0254);
+
+    ReleaseDC(NULL, ScreenDC);
+  }
+}
+
+static void iInitBits(imDib* dib, BYTE* bits)
+{
+  if (bits == NULL)
+    dib->bits = dib->dib + sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * dib->palette_count;
+  else
+    dib->bits = bits;
+}
+
+static int iGetValidBpp(int bpp)
+{
+  if (bpp == 1) 
+    bpp = 1; 
+  else if (bpp <= 4) 
+    bpp = 4; 
+  else if (bpp <= 8) 
+    bpp = 8; 
+  else if (bpp <= 16) 
+    bpp = 16; 
+  else if (bpp <= 24) 
+    bpp = 24; 
+  else if (bpp <= 32)
+    bpp = 32; 
+  else
+    bpp = 0;
+
+  return bpp;
+}
+
+static int iCheckHeader(BITMAPINFOHEADER *bmih)
+{
+  if (bmih->biSize != sizeof(BITMAPINFOHEADER))
+    return 0;
+
+  if (bmih->biWidth <= 0)
+    return 0;
+
+  if (bmih->biHeight == 0)
+    return 0;
+
+  {
+    int bpp = iGetValidBpp(bmih->biBitCount);
+    if (!bpp)
+      return 0;
+
+    if (bmih->biCompression == BI_RLE8 && bpp != 8)
+      return 0;
+
+    if (bmih->biCompression == BI_RLE4 && bpp != 4)
+      return 0;
+
+    if (bmih->biCompression == BI_BITFIELDS && (bpp != 16 || bpp != 32))
+      return 0;
+
+    if (bmih->biHeight < 0 && (bmih->biCompression == BI_RLE8 || bmih->biCompression == BI_RLE4))
+      return 0;
+
+/*    if (bmih->biCompression == BI_JPEG || bmih->biCompression == BI_PNG)
+      return 0; */
+  }
+
+  return 1;
+}
+
+/*****************
+  Creation
+*****************/
+
+static void AllocDib(imDib* dib) 
+{
+  dib->dib = NULL;
+  dib->handle = GlobalAlloc(GMEM_MOVEABLE, dib->size); 
+  if (!dib->handle) return;
+  dib->dib = (BYTE*)GlobalLock(dib->handle); 
+}
+
+imDib* imDibCreate(int width, int height, int bpp)
+{
+  imDib* dib;
+  int obpp = bpp;
+
+  bpp = iGetValidBpp(abs(bpp));
+  
+  assert(width > 0 && height > 0);
+  assert(bpp);
+
+  dib = (imDib*)malloc(sizeof(imDib));
+
+  if (bpp > 8)
+  {
+    if ((bpp == 16 || bpp == 32) && obpp < 0)
+      dib->palette_count = 3;
+    else
+      dib->palette_count = 0;
+  }
+  else
+    dib->palette_count = 1 << bpp;
+  
+  iInitSizes(dib, width, height, bpp);
+                         
+  AllocDib(dib);
+  if (dib->dib == NULL)
+  {
+    free(dib);
+    return NULL;
+  }
+
+  iInitHeadersReference(dib);
+
+  iInitInfoHeader(dib->bmih, width, height, bpp, dib->palette_count);
+
+  iInitBits(dib, NULL);
+
+  dib->is_reference = 0;
+  
+  return dib;
+}
+
+imDib* imDibCreateSection(HDC hDC, HBITMAP *bitmap, int width, int height, int bpp)
+{
+  BITMAPINFO* bmi;
+  BYTE* bits;
+  int palette_count;
+  int obpp = bpp;
+
+  bpp = iGetValidBpp(abs(bpp));
+
+  assert(hDC);
+  assert(width > 0 && height > 0);
+  assert(bpp);
+
+  if (bpp > 8)
+  {
+    if ((bpp == 16 || bpp == 32) && obpp < 0)
+      palette_count = 3;  
+    else
+      palette_count = 0;
+  }
+  else
+    palette_count = 1 << bpp;
+
+  bmi = (BITMAPINFO*)malloc(sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * palette_count);
+
+  iInitInfoHeader(&bmi->bmiHeader, width, height, bpp, palette_count);
+
+  if (bpp > 8 && palette_count == 3)
+  {
+    DWORD *masks = (DWORD*)(bmi + sizeof(BITMAPINFOHEADER));
+    masks[0] = 0x001F;
+    masks[1] = 0x03E0;
+    masks[2] = 0x7C00;
+  }
+
+  *bitmap = CreateDIBSection(hDC, bmi, DIB_RGB_COLORS, (void**)&bits, NULL, 0);
+
+  {
+    imDib* dib;
+    dib = imDibCreateReference((BYTE*)bmi, bits);
+    dib->is_reference = 0;
+    return dib;
+  }
+}
+
+
+imDib* imDibCreateCopy(const imDib* src_dib)
+{
+  imDib* dib;
+
+  assert(src_dib);
+
+  dib = (imDib*)malloc(sizeof(imDib));
+
+  memcpy(dib, src_dib, sizeof(imDib));
+
+  AllocDib(dib);
+  if (dib->dib == NULL)
+  {
+    free(dib);
+    return NULL;
+  }
+
+  iInitHeadersReference(dib);
+
+  memcpy(dib->dib, src_dib->dib, dib->size - dib->bits_size);
+
+  iInitBits(dib, NULL);
+
+  memcpy(dib->bits, src_dib->bits, dib->bits_size);
+
+  dib->is_reference = 0;
+
+  return dib;
+}
+
+imDib* imDibCreateReference(BYTE* bmi, BYTE* bits)
+{
+  imDib* dib;
+
+  assert(bmi);
+
+  dib = (imDib*)malloc(sizeof(imDib));
+
+  dib->dib = bmi;
+  
+  iInitHeadersReference(dib);
+  
+  if (dib->bmih->biBitCount > 8)
+  {
+    dib->palette_count = 0;
+    
+    if (dib->bmih->biCompression == BI_BITFIELDS)
+      dib->palette_count = 3;
+  }
+  else
+  {
+    if (dib->bmih->biClrUsed != 0)
+      dib->palette_count = dib->bmih->biClrUsed;
+    else
+      dib->palette_count = 1 << dib->bmih->biBitCount;
+  }
+  
+  iInitBits(dib, bits);
+  
+  dib->is_reference = 1;
+
+  iInitSizes(dib, dib->bmih->biWidth, abs(dib->bmih->biHeight), dib->bmih->biBitCount);
+
+  return dib;
+}
+
+void imDibDestroy(imDib* dib)
+{
+  assert(dib);
+  if (!dib->is_reference) 
+  {
+    GlobalUnlock(dib->handle);
+    GlobalFree(dib->handle);
+  }
+  free(dib);
+}
+
+/*****************
+  Line Acess
+*****************/
+
+imDibLineGetPixel imDibLineGetPixelFunc(int bpp)
+{
+  switch(bpp)
+  {
+  case 1:
+    return &iLineGetPixel1;
+  case 4:
+    return &iLineGetPixel4;
+  case 8:
+    return &iLineGetPixel8;
+  case 16:
+    return &iLineGetPixel16;
+  case 24:
+    return &iLineGetPixel24;
+  case 32:
+    return &iLineGetPixel32;
+  default:
+    if (bpp > 32) return NULL;
+    iGetPixelAnyBpp = bpp;
+    iGetPixelAnyMask = iMakeBitMask(bpp);
+    return &iLineGetPixelAny;
+  }
+}
+
+imDibLineSetPixel imDibLineSetPixelFunc(int bpp)
+{
+  switch(bpp)
+  {
+  case 1:
+    return &iLineSetPixel1;
+  case 4:
+    return &iLineSetPixel4;
+  case 8:
+    return &iLineSetPixel8;
+  case 16:
+    return &iLineSetPixel16;
+  case 24:
+    return &iLineSetPixel24;
+  case 32:
+    return &iLineSetPixel32;
+  default:
+    if (bpp > 32) return NULL;
+    iSetPixelAnyBpp = bpp;
+    iSetPixelAnyMask = iMakeBitMask(bpp);
+    return &iLineSetPixelAny;
+  }
+}
+
+/*****************
+  DIB <-> Bitmap
+*****************/
+
+imDib* imDibFromHBitmap(const HBITMAP bitmap, const HPALETTE hPalette)
+{
+  imDib* dib;
+
+  assert(bitmap);
+
+  {
+    BITMAP bmp; 
+ 
+    if (!GetObject(bitmap, sizeof(BITMAP), (LPSTR)&bmp)) 
+      return NULL;
+ 
+    dib = imDibCreate(bmp.bmWidth, bmp.bmHeight, bmp.bmPlanes * bmp.bmBitsPixel);
+  }
+
+  if (!dib)
+    return NULL;
+  
+  {
+    HDC ScreenDC = GetDC(NULL);
+    HPALETTE hOldPalette = NULL;
+    if (hPalette) hOldPalette = SelectPalette(ScreenDC, hPalette, FALSE);
+    RealizePalette(ScreenDC);
+
+    GetDIBits(ScreenDC, bitmap, 0, dib->bmih->biHeight, dib->bits, dib->bmi, DIB_RGB_COLORS);	
+
+    if (hOldPalette) SelectPalette(ScreenDC, hOldPalette, FALSE);
+    ReleaseDC(NULL, ScreenDC);
+  }
+  
+  return dib;
+}
+
+HBITMAP imDibToHBitmap(const imDib* dib)
+{
+  HBITMAP bitmap;
+
+  assert(dib);
+
+  {
+    HDC ScreenDC = GetDC(NULL);
+    bitmap = CreateDIBitmap(ScreenDC, dib->bmih, CBM_INIT, dib->bits, dib->bmi, DIB_RGB_COLORS);
+    ReleaseDC(NULL, ScreenDC);
+  }
+
+/* 
+  Another Way
+  bitmap = CreateCompatibleBitmap(ScreenDC, dib->bmih->biWidth, dib->bmih->biHeight);
+  SetDIBits(ScreenDC, bitmap, 0, dib->bmih->biHeight, dib->bits, dib->bmi, DIB_RGB_COLORS);	
+*/
+
+  return bitmap;
+}
+
+/*******************
+  DIB <-> Clipboard
+*******************/
+
+int imDibIsClipboardAvailable(void)
+{
+  if (IsClipboardFormatAvailable(CF_DIB) ||
+      IsClipboardFormatAvailable(CF_BITMAP))
+    return 1;
+
+  return 0;
+}
+
+imDib* imDibPasteClipboard(void)
+{
+  int clip_type = 0;
+  if (IsClipboardFormatAvailable(CF_DIB)) 
+    clip_type = CF_DIB;
+  else if (IsClipboardFormatAvailable(CF_BITMAP)) 
+    clip_type = CF_BITMAP;
+
+  if (!clip_type)
+    return NULL;
+
+  OpenClipboard(NULL);
+  HANDLE Handle = GetClipboardData(clip_type);
+  if (Handle == NULL)
+  {
+    CloseClipboard();
+    return NULL;
+  }
+  
+  imDib *dib;
+  if (clip_type == CF_DIB)
+  {
+    BYTE* bmi = (BYTE*)GlobalLock(Handle);
+    if (!bmi || !iCheckHeader((BITMAPINFOHEADER*)bmi))
+    {
+      CloseClipboard();
+      return NULL;
+    }
+
+    {
+      imDib* clip_dib = imDibCreateReference(bmi, NULL);
+      dib = imDibCreateCopy(clip_dib);
+      imDibDestroy(clip_dib);
+      GlobalUnlock(Handle);
+    }
+  }
+  else
+  {
+    HPALETTE hpal = (HPALETTE)GetClipboardData(CF_PALETTE);
+
+    /* If there is a CF_PALETTE object in the clipboard, this is the palette to assume */
+    /* the bitmap is realized against.                                                 */
+    if (!hpal)
+      hpal = (HPALETTE)GetStockObject(DEFAULT_PALETTE);
+
+    dib = imDibFromHBitmap((HBITMAP)Handle, hpal);
+  }
+  
+  CloseClipboard();
+  
+  return dib;
+}  
+
+void imDibCopyClipboard(imDib* dib)
+{
+  assert(dib);
+
+  if (!OpenClipboard(NULL))
+    return;
+  EmptyClipboard();
+  GlobalUnlock(dib->handle);
+  SetClipboardData(CF_DIB, dib->handle);
+  CloseClipboard();
+
+  dib->dib = NULL;
+  dib->is_reference = 1;
+  imDibDestroy(dib);
+}
+
+/*******************
+  DIB -> Palette
+*******************/
+
+HPALETTE imDibLogicalPalette(const imDib* dib)
+{
+  LOGPALETTE* pLogPal;      
+  PALETTEENTRY* pPalEntry;
+  HPALETTE hPal;
+  RGBQUAD* bmic;
+  int c;
+  
+  assert(dib);
+  assert(dib->bmih->biBitCount <= 8);
+  
+  pLogPal = (LOGPALETTE*)malloc(sizeof(LOGPALETTE) + dib->palette_count * sizeof(PALETTEENTRY));
+  pLogPal->palVersion    = 0x300; 
+  pLogPal->palNumEntries = (WORD)dib->palette_count;
+  
+  bmic = dib->bmic;
+  pPalEntry = pLogPal->palPalEntry;
+  
+  for (c = 0; c < dib->palette_count; c++) 
+  {
+    pPalEntry->peRed   = bmic->rgbRed;
+    pPalEntry->peGreen = bmic->rgbGreen;
+    pPalEntry->peBlue  = bmic->rgbBlue;
+    pPalEntry->peFlags = PC_NOCOLLAPSE;
+    
+    pPalEntry++;
+    bmic++;
+  }
+  
+  hPal = CreatePalette(pLogPal);
+  free(pLogPal);
+  
+  return hPal;
+}
+
+/*******************
+  DIB <-> RGB Image
+*******************/
+
+void imDibEncodeFromRGBA(imDib* dib, const unsigned char* red, const unsigned char* green, const unsigned char* blue, const unsigned char* alpha)
+{
+  int x, y;
+  BYTE* bits;
+  
+  if (dib->bmih->biHeight < 0)
+    bits = dib->bits + (dib->bits_size - dib->line_size); /* start of last line */
+  else
+    bits = dib->bits;
+  
+  assert(dib->bmih->biBitCount > 16);
+  
+  for (y = 0; y < abs(dib->bmih->biHeight); y++)
+  {
+    for (x = 0; x < dib->bmih->biWidth; x++)
+    {
+      *bits++ = *blue++;
+      *bits++ = *green++;
+      *bits++ = *red++;
+
+      if (dib->bmih->biBitCount == 32)
+      {
+        if (alpha)
+          *bits++ = *alpha++;
+        else
+          *bits++ = 0xFF; /* opaque */
+      }
+    }
+    
+    bits += dib->pad_size;
+
+    if (dib->bmih->biHeight < 0)
+      bits -= 2*dib->line_size;
+  }
+}
+
+void imDibDecodeToRGBA(const imDib* dib, unsigned char* red, unsigned char* green, unsigned char* blue, unsigned char* alpha)
+{
+  int x, y, offset;
+  unsigned short color;
+  BYTE* bits;
+  unsigned int rmask = 0, gmask = 0, bmask = 0, 
+                roff = 0, goff = 0, boff = 0; /* pixel bit mask control when reading 16 and 32 bpp images */
+  
+  assert(dib);
+  assert(dib->bmih->biBitCount > 8);
+  assert(red && green && blue);
+
+  if (dib->bmih->biHeight < 0)
+    bits = dib->bits + (dib->bits_size - dib->line_size); /* start of last line */
+  else
+    bits = dib->bits;
+  
+  if (dib->bmih->biBitCount == 16)
+    offset = dib->line_size;  /* do not increment for each pixel, jump line */
+  else
+    offset = dib->pad_size;   /* increment for each pixel, jump pad */
+  
+  if (dib->bmih->biCompression == BI_BITFIELDS)
+  {
+    unsigned int Mask;
+    unsigned int* palette = (unsigned int*)dib->bmic;
+    
+    rmask = Mask = palette[0];
+    while (!(Mask & 0x01))
+    {Mask >>= 1; roff++;}
+    
+    gmask = Mask = palette[1];
+    while (!(Mask & 0x01))
+    {Mask >>= 1; goff++;}
+    
+    bmask = Mask = palette[2];
+    while (!(Mask & 0x01))
+    {Mask >>= 1; boff++;}
+  }
+  else if (dib->bmih->biBitCount == 16)
+  {
+    bmask = 0x001F;
+    gmask = 0x03E0;
+    rmask = 0x7C00;
+    boff = 0;
+    goff = 5;
+    roff = 10;
+  }
+  
+  for (y = 0; y < abs(dib->bmih->biHeight); y++)
+  {
+    for (x = 0; x < dib->bmih->biWidth; x++)
+    {
+      if (dib->bmih->biBitCount == 16)
+      {
+        color = ((unsigned short*)bits)[x];
+        *red++ = (unsigned char)((((rmask & color) >> roff) * 255) / (rmask >> roff));
+        *green++ = (unsigned char)((((gmask & color) >> goff) * 255) / (gmask >> goff));
+        *blue++ = (unsigned char)((((bmask & color) >> boff) * 255) / (bmask >> boff));
+      }
+      else
+      {
+        *blue++ = *bits++;
+        *green++ = *bits++;
+        *red++ = *bits++;
+        
+        if (dib->bmih->biBitCount == 32)
+        {
+          if (alpha)
+            *alpha++ = *bits++;
+          else
+            bits++;
+        }
+      }
+    }
+    
+    bits += offset;
+
+    if (dib->bmih->biHeight < 0)
+      bits -= 2*dib->line_size;
+  }
+}
+
+/*******************
+  DIB <-> Map Image
+*******************/
+
+void imDibEncodeFromMap(imDib* dib, const unsigned char* map, const long* palette, int palette_count)
+{
+  assert(dib);
+  assert(map && palette);
+  assert(dib->bmih->biBitCount <= 8);
+  assert(dib->bmih->biCompression != BI_RLE8);
+
+  {
+    int x, y;
+    BYTE* bits;
+    
+    if (dib->bmih->biHeight < 0)
+      bits = dib->bits + (dib->bits_size - dib->line_size); /* start of last line */
+    else
+      bits = dib->bits;
+
+    for (y = 0; y < abs(dib->bmih->biHeight); y++)
+    {
+      for (x = 0; x < dib->bmih->biWidth; x++)
+        bits[x] = *map++;
+    
+      if (dib->bmih->biHeight < 0)
+        bits -= dib->line_size;
+      else
+        bits += dib->line_size;
+    }
+  }
+
+  {
+    int c;
+    RGBQUAD* bmic = dib->bmic;
+
+    for (c = 0; c < palette_count; c++)
+      *bmic++ = iLong2Quad(palette[c]);
+  }
+
+  dib->bmih->biClrUsed = palette_count;
+  dib->bmih->biClrImportant = 0;
+  dib->palette_count = palette_count;
+}
+
+void imDibDecodeToMap(const imDib* dib, unsigned char* map, long* palette)
+{
+  assert(dib);
+  assert(dib->bmih->biBitCount <= 8);
+  assert(map && palette);
+
+  {
+    int x, y;
+    BYTE* bits;
+    
+    if (dib->bmih->biHeight < 0)
+      bits = dib->bits + (dib->bits_size - dib->line_size); /* start of last line */
+    else
+      bits = dib->bits;
+  
+    for (y = 0; y < abs(dib->bmih->biHeight); y++)
+    {
+      for (x = 0; x < dib->bmih->biWidth; x++)
+      {
+        switch (dib->bmih->biBitCount)
+        {
+        case 1:
+          *map++ = (unsigned char)((bits[x / 8] >> (7 - x % 8)) & 0x01);
+          break;
+        case 4:
+          *map++ = (unsigned char)((bits[x / 2] >> ((1 - x % 2) * 4)) & 0x0F);
+          break;
+        case 8:
+          *map++ = bits[x];
+          break;
+        }
+      }
+    
+      if (dib->bmih->biHeight < 0)
+        bits -= dib->line_size;
+      else
+        bits += dib->line_size;
+    }
+  }
+  
+  {
+    int c;
+    RGBQUAD* bmic = dib->bmic;
+
+    for (c = 0; c < dib->palette_count; c++)
+    {
+      palette[c] = iQuad2Long(bmic);
+      *bmic++;
+    }
+  }
+}
+
+/*******************
+  DIB <-> File
+*******************/
+
+int imDibSaveFile(const imDib* dib, char* filename)
+{ 
+  DWORD dwTmp; 
+  HANDLE hFile;                 /* file handle */ 
+  BITMAPFILEHEADER file_header; /* bitmap file-header */ 
+
+  assert(dib);
+  assert(filename);
+
+  hFile = CreateFile(filename, GENERIC_WRITE, (DWORD) 0, 
+                 (LPSECURITY_ATTRIBUTES)NULL, 
+                 CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, (HANDLE) NULL); 
+
+  if (hFile == INVALID_HANDLE_VALUE) 
+    return 0;
+
+  /* 0x42 = "B" 0x4d = "M" */ 
+  file_header.bfType = 0x4d42;        
+
+  /* Compute the size of the entire file. */ 
+  file_header.bfSize = (DWORD) (sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dib->palette_count*sizeof(RGBQUAD) + dib->bits_size); 
+
+  file_header.bfReserved1 = 0; 
+  file_header.bfReserved2 = 0; 
+
+  /* Compute the offset to the bits array. */ 
+  file_header.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dib->palette_count*sizeof(RGBQUAD); 
+
+  /* Copy the BITMAPFILEHEADER into the .BMP file. */ 
+  if (!WriteFile(hFile, (LPVOID)&file_header, sizeof(BITMAPFILEHEADER), (LPDWORD)&dwTmp, (LPOVERLAPPED)NULL)) 
+    goto save_error;
+
+  /* Copy the BITMAPINFOHEADER into the file. */ 
+  if (!WriteFile(hFile, (LPVOID)dib->bmih, sizeof(BITMAPINFOHEADER), (LPDWORD)&dwTmp, (LPOVERLAPPED)NULL)) 
+    goto save_error;
+
+  /* Copy the RGBQUAD array into the file. */ 
+  if (dib->palette_count > 0)
+  {
+    if (!WriteFile(hFile, (LPVOID)dib->bmic, dib->palette_count*sizeof(RGBQUAD), (LPDWORD)&dwTmp, (LPOVERLAPPED)NULL)) 
+      goto save_error;
+  }
+
+  /* Copy the bits array into the .BMP file. */ 
+  if (!WriteFile(hFile, dib->bits, dib->bits_size, (LPDWORD)&dwTmp, (LPOVERLAPPED)NULL)) 
+    goto save_error;
+
+  /* Close the .BMP file. */ 
+  CloseHandle(hFile);
+
+  return 1;
+
+save_error:
+  CloseHandle(hFile);
+  return 0;
+} 
+ 
+imDib* imDibLoadFile(const char* filename)
+{ 
+  HANDLE hFile;                 /* file handle */ 
+  DWORD dwTmp; 
+  imDib* dib = NULL;
+  BITMAPFILEHEADER file_header; /* bitmap file-header */ 
+  BITMAPINFOHEADER bmih;
+
+  assert(filename);
+
+  hFile = CreateFile(filename, GENERIC_READ, (DWORD) 0, 
+                 (LPSECURITY_ATTRIBUTES)NULL, 
+                 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, (HANDLE) NULL); 
+
+  if (hFile == INVALID_HANDLE_VALUE) 
+    return NULL;
+
+  /* Read the BITMAPFILEHEADER from the .BMP file. */ 
+  if (!ReadFile(hFile, (LPVOID)&file_header, sizeof(BITMAPFILEHEADER), (LPDWORD)&dwTmp, (LPOVERLAPPED)NULL)) 
+    goto load_error;
+
+  if (file_header.bfType != 0x4d42)
+    goto load_error;
+
+  /* Read the BITMAPINFOHEADER from the file. */ 
+  if (!ReadFile(hFile, (LPVOID)&bmih, sizeof(BITMAPINFOHEADER), (LPDWORD)&dwTmp, (LPOVERLAPPED)NULL)) 
+    goto load_error;
+
+  if(!iCheckHeader(&bmih))
+    goto load_error;
+
+  dib = imDibCreate(bmih.biWidth, abs(bmih.biHeight), bmih.biCompression==BI_BITFIELDS? -bmih.biBitCount: bmih.biBitCount);
+
+  memcpy(dib->bmih, &bmih, bmih.biSize);
+
+  if (bmih.biSize != sizeof(BITMAPINFOHEADER))
+  {
+    /* skip newer BIH definitions */
+    SetFilePointer(hFile, bmih.biSize - sizeof(BITMAPINFOHEADER), NULL, FILE_CURRENT);
+    dib->bmih->biSize = sizeof(BITMAPINFOHEADER);
+  }
+
+  /* Read the RGBQUAD array from the file. */ 
+  if (dib->palette_count > 0)
+  {
+    if (!ReadFile(hFile, (LPVOID)dib->bmic, dib->palette_count*sizeof(RGBQUAD), (LPDWORD)&dwTmp, (LPOVERLAPPED)NULL)) 
+      goto load_error;
+  }
+
+  /* Read the Bits array from the .BMP file. */ 
+  SetFilePointer(hFile, file_header.bfOffBits, NULL, FILE_BEGIN);
+
+  {
+    int bits_size = dib->bits_size;
+
+    if (bmih.biBitCount < 16 && bmih.biCompression != BI_RGB)
+      bits_size = GetFileSize(hFile, NULL) - file_header.bfOffBits;
+
+    if (bits_size > dib->bits_size)
+      goto load_error;
+
+    if (!ReadFile(hFile, dib->bits, bits_size, (LPDWORD)&dwTmp, (LPOVERLAPPED)NULL)) 
+      goto load_error;
+  }
+
+  /* Close the .BMP file. */ 
+  CloseHandle(hFile);
+
+  return dib;
+
+load_error:
+  if (dib) imDibDestroy(dib);
+  CloseHandle(hFile);
+  return NULL;
+} 
+
+/*******************
+  Screen -> DIB
+*******************/
+
+imDib* imDibCaptureScreen(int x, int y, int width, int height)
+{
+  HBITMAP bitmap;
+  HDC ScreenDC = GetDC(NULL);
+  HDC hdcCompatible = CreateCompatibleDC(ScreenDC); 
+
+  if (width == 0) width = GetDeviceCaps(ScreenDC, HORZRES);
+  if (height == 0) height = GetDeviceCaps(ScreenDC, VERTRES);
+
+  bitmap = CreateCompatibleBitmap(ScreenDC, width, height);
+
+  if (!bitmap) 
+  {
+    ReleaseDC(NULL, ScreenDC);
+    return NULL;
+  }
+
+  /* Select the bitmaps into the compatible DC.  */
+  SelectObject(hdcCompatible, bitmap);
+
+  /* Copy color data for the entire display into a */
+  /* bitmap that is selected into a compatible DC. */
+  BitBlt(hdcCompatible, 0, 0, width, height, ScreenDC, x, y, SRCCOPY);
+
+  ReleaseDC(NULL, ScreenDC);
+  DeleteDC(hdcCompatible);
+
+  {
+    imDib* dib = imDibFromHBitmap(bitmap, NULL);
+    DeleteObject(bitmap);
+    return dib;
+  }
+}