reactos/base/applications/paint/dib.c

   1 /*
   2  * PROJECT:     PAINT for ReactOS
   3  * LICENSE:     LGPL
   4  * FILE:        dib.c
   5  * PURPOSE:     Some DIB related functions
   6  * PROGRAMMERS: Benedikt Freisen
   7  */
   8
   9 /* INCLUDES *********************************************************/
  10
  11 #include <windows.h>
  12
  13 /* FUNCTIONS ********************************************************/
  14
  15 HBITMAP CreateDIBWithProperties(int width, int height)
  16 {
  17     BITMAPINFO bitmapinfo;
  18     bitmapinfo.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
  19     bitmapinfo.bmiHeader.biWidth = width;
  20     bitmapinfo.bmiHeader.biHeight = height;
  21     bitmapinfo.bmiHeader.biPlanes = 1;
  22     bitmapinfo.bmiHeader.biBitCount = 24;
  23     bitmapinfo.bmiHeader.biCompression = BI_RGB;
  24     bitmapinfo.bmiHeader.biSizeImage = 0;
  25     bitmapinfo.bmiHeader.biXPelsPerMeter = 0;
  26     bitmapinfo.bmiHeader.biYPelsPerMeter = 0;
  27     bitmapinfo.bmiHeader.biClrUsed = 0;
  28     bitmapinfo.bmiHeader.biClrImportant = 0;
  29     return CreateDIBSection(NULL, &bitmapinfo, DIB_RGB_COLORS, NULL, NULL, 0);
  30 }
  31
  32 int GetDIBWidth(HBITMAP hbm)
  33 {
  34     BITMAP bm;
  35     GetObject(hbm, sizeof(BITMAP), &bm);
  36     return bm.bmWidth;
  37 }
  38
  39 int GetDIBHeight(HBITMAP hbm)
  40 {
  41     BITMAP bm;
  42     GetObject(hbm, sizeof(BITMAP), &bm);
  43     return bm.bmHeight;
  44 }
  45
  46 void SaveDIBToFile(HBITMAP hbm, LPSTR name, HDC hdc)
  47 {
  48     BITMAP bm;
  49     GetObject(hbm, sizeof(BITMAP), &bm);
  50     BITMAPFILEHEADER bf;
  51     BITMAPINFOHEADER bi;
  52     int imgDataSize = bm.bmWidthBytes*bm.bmHeight;
  53     bf.bfType = 0x4d42;
  54     bf.bfSize = imgDataSize+52;
  55     bf.bfReserved1 = 0;
  56     bf.bfReserved2 = 0;
  57     bf.bfOffBits = 54;
  58     bi.biSize = 40;
  59     bi.biWidth = bm.bmWidth;
  60     bi.biHeight = bm.bmHeight;
  61     bi.biPlanes = bm.bmPlanes;
  62     bi.biBitCount = bm.bmBitsPixel;
  63     bi.biCompression = BI_RGB;
  64     bi.biSizeImage = 0;
  65     bi.biXPelsPerMeter = 0;
  66     bi.biYPelsPerMeter = 0;
  67     bi.biClrUsed = 0;
  68     bi.biClrImportant = 0;
  69     int *buffer = HeapAlloc(GetProcessHeap(), HEAP_GENERATE_EXCEPTIONS, imgDataSize);
  70     GetDIBits(hdc, hbm, 0, bm.bmHeight, buffer, (LPBITMAPINFO)&bi, DIB_RGB_COLORS);
  71     HANDLE f = CreateFile(name, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_FLAG_SEQUENTIAL_SCAN, NULL);
  72     int bytesWritten;
  73     WriteFile(f, &bf, 14, (LPDWORD)&bytesWritten, NULL);
  74     WriteFile(f, &bi, 40, (LPDWORD)&bytesWritten, NULL);
  75     WriteFile(f, buffer, imgDataSize, (LPDWORD)&bytesWritten, NULL);
  76     CloseHandle(f);
  77     HeapFree(GetProcessHeap(), 0, buffer);
  78 }
  79
  80 HBITMAP LoadDIBFromFile(LPSTR name)
  81 {
  82     HBITMAP bm;
  83     BITMAPFILEHEADER bfh;
  84     BITMAPINFO *bi;
  85     VOID *data;
  86     int bytesRead;
  87     HANDLE f = CreateFile(name, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, NULL);
  88     ReadFile(f, &bfh, 14, (LPDWORD)&bytesRead, NULL);
  89     if (bfh.bfType!=0x4d42)
  90     {
  91         CloseHandle(f);
  92         return NULL;
  93     }
  94     bi = HeapAlloc(GetProcessHeap(), HEAP_GENERATE_EXCEPTIONS, bfh.bfOffBits-14);
  95     ReadFile(f, bi, bfh.bfOffBits-14, (LPDWORD)&bytesRead, NULL);
  96     bm = CreateDIBSection(NULL, bi, DIB_RGB_COLORS, &data, NULL, 0);
  97     ReadFile(f, data, bfh.bfSize-bfh.bfOffBits, (LPDWORD)&bytesRead, NULL);
  98     CloseHandle(f);
  99     HeapFree(GetProcessHeap(), 0, bi);
 100     return bm;
 101 }