Image(bitmap) larger size than the initial
I have load a bitmap from a file(image has 2.25 MB) and later save bitmap(it has 3 MB)...why?
I use this code.
Code:
#include <windows.h>
#include <stdlib.h>
PBITMAPINFO CreateBitmapInfoStruct(HWND hwnd, HBITMAP hBmp);
void CreateBMPFile(HWND hwnd, LPTSTR pszFile, PBITMAPINFO pbi,
HBITMAP hBMP, HDC hDC);
const char g_szClassName[] = "myWindowClass";
#define DESEN_LINIE 2001
#define DESEN_TRIUNGHI 2002
#define DESEN_DREPTUNGHI 2003
#define DESEN_PATRAT 2004
#define DESEN_PUNCT 2005
#define FILE_OPEN 3001
#define FILE_SAVE 3002
#define FILE_EXIT 3003
int i=0,j=0;
int cScreenX,cScreenY;
POINTS ptsLinie;
#include <windows.h>
#include "abc.h"
HINSTANCE hInst;
LRESULT CALLBACK WindProcedure(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);
INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX WndCls;
static char szAppName[] = "BitmapIntro";
MSG Msg;
hInst = hInstance;
WndCls.cbSize = sizeof(WndCls);
WndCls.style = CS_OWNDC | CS_VREDRAW | CS_HREDRAW;
WndCls.lpfnWndProc = WindProcedure;
WndCls.cbClsExtra = 0;
WndCls.cbWndExtra = 0;
WndCls.hInstance = hInst;
WndCls.hIcon = LoadIcon(NULL, IDI_APPLICATION);
WndCls.hCursor = LoadCursor(NULL, IDC_ARROW);
WndCls.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
WndCls.lpszMenuName = NULL;
WndCls.lpszClassName = szAppName;
WndCls.hIconSm = LoadIcon(hInstance, IDI_APPLICATION);
RegisterClassEx(&WndCls);
CreateWindowEx(WS_EX_OVERLAPPEDWINDOW,
szAppName,
"Bitmaps Fundamentals",
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL);
while( GetMessage(&Msg, NULL, 0, 0) )
{
TranslateMessage(&Msg);
DispatchMessage( &Msg);
}
return Msg.wParam;
}
LRESULT CALLBACK WindProcedure(HWND hwnd, UINT Msg,
WPARAM wParam, LPARAM lParam)
{
static HDC hdc,memDC;
static PAINTSTRUCT ps;
static HBITMAP hBmpOld;
static HBITMAP hBmpImage;
static PBITMAPINFO pBmpInfo;
static POINTS ptsBegin;
switch(Msg)
{
case WM_CREATE:
{
HMENU hMenu, hSubMenu;
hMenu = CreateMenu();
hSubMenu=CreatePopupMenu();
AppendMenu(hMenu, MF_STRING | MF_POPUP, (UINT)hSubMenu, "&File");
AppendMenu(hSubMenu, MF_STRING,FILE_OPEN, "OPEN");
AppendMenu(hSubMenu, MF_STRING,FILE_SAVE, "SAVE");
AppendMenu(hSubMenu, MF_STRING,FILE_EXIT, "EXIT");
SetMenu(hwnd, hMenu);
hdc=GetDC(hwnd);
hBmpImage=(HBITMAP)LoadImage(NULL,"abc.bmp",IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
if (hBmpImage==NULL)
MessageBox(hwnd,"da","da",MB_OK);
// Create a memory device compatible with the above DC variable
memDC = CreateCompatibleDC(hdc);
// Select the new bitmap
hBmpOld=SelectObject(memDC,hBmpImage);
cScreenX=GetSystemMetrics(SM_CXSCREEN);
cScreenY=GetSystemMetrics(SM_CYSCREEN);
}
break;
case WM_COMMAND:
{
switch(LOWORD(wParam))
{
case FILE_SAVE:
pBmpInfo=CreateBitmapInfoStruct(hwnd,hBmpImage);
CreateBMPFile(hwnd,"blabla2.bmp",pBmpInfo,hBmpImage,hdc);
break;
}
}
break;
case WM_PAINT:
{
hdc = BeginPaint(hwnd, &ps);
// Copy the bits from the memory DC into the current dc
BitBlt(hdc, 0, 0,cScreenX,cScreenY,memDC, 0, 0, SRCCOPY);
// Restore the old bitmap
EndPaint(hwnd, &ps);
++i;
}
break;
case WM_MOUSEMOVE:
{
ptsBegin=MAKEPOINTS(lParam);
LineTo(memDC,ptsBegin.x,ptsBegin.y);
}
break;
case WM_DESTROY:
{
SelectObject(memDC,hBmpOld);
DeleteDC(memDC);
DeleteObject(hBmpImage);
PostQuitMessage(WM_QUIT);
}
break;
default:
return DefWindowProc(hwnd, Msg, wParam, lParam);
}
return 0;
}
PBITMAPINFO CreateBitmapInfoStruct(HWND hwnd, HBITMAP hBmp)
{
BITMAP bmp;
PBITMAPINFO pbmi;
WORD cClrBits;
// Retrieve the bitmap color format, width, and height.
if (!GetObject(hBmp, sizeof(BITMAP), (LPSTR)&bmp))
MessageBox(hwnd,"da","da",MB_OK);
// Convert the color format to a count of bits.
cClrBits = (WORD)(bmp.bmPlanes * bmp.bmBitsPixel);
if (cClrBits == 1)
cClrBits = 1;
else if (cClrBits <= 4)
cClrBits = 4;
else if (cClrBits <= 8)
cClrBits = 8;
else if (cClrBits <= 16)
cClrBits = 16;
else if (cClrBits <= 24)
cClrBits = 24;
else cClrBits = 32;
// Allocate memory for the BITMAPINFO structure. (This structure
// contains a BITMAPINFOHEADER structure and an array of RGBQUAD
// data structures.)
if (cClrBits < 24)
pbmi = (PBITMAPINFO) LocalAlloc(LPTR,
sizeof(BITMAPINFOHEADER) +
sizeof(RGBQUAD) * (1<< cClrBits));
// There is no RGBQUAD array for these formats: 24-bit-per-pixel or 32-bit-per-pixel
else
pbmi = (PBITMAPINFO) LocalAlloc(LPTR,
sizeof(BITMAPINFOHEADER));
// Initialize the fields in the BITMAPINFO structure.
pbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
pbmi->bmiHeader.biWidth = bmp.bmWidth;
pbmi->bmiHeader.biHeight = bmp.bmHeight;
pbmi->bmiHeader.biPlanes = bmp.bmPlanes;
pbmi->bmiHeader.biBitCount = bmp.bmBitsPixel;
if (cClrBits < 24)
pbmi->bmiHeader.biClrUsed = (1<<cClrBits);
// If the bitmap is not compressed, set the BI_RGB flag.
pbmi->bmiHeader.biCompression = BI_RGB;
// Compute the number of bytes in the array of color
// indices and store the result in biSizeImage.
// The width must be DWORD aligned unless the bitmap is RLE
// compressed.
pbmi->bmiHeader.biSizeImage = ((pbmi->bmiHeader.biWidth * cClrBits +31) & ~31) /8
* pbmi->bmiHeader.biHeight;
// Set biClrImportant to 0, indicating that all of the
// device colors are important.
pbmi->bmiHeader.biClrImportant = 0;
return pbmi;
}
void CreateBMPFile(HWND hwnd, LPTSTR pszFile, PBITMAPINFO pbi,
HBITMAP hBMP, HDC hDC)
{
HANDLE hf; // file handle
BITMAPFILEHEADER hdr; // bitmap file-header
PBITMAPINFOHEADER pbih; // bitmap info-header
LPBYTE lpBits; // memory pointer
DWORD dwTotal; // total count of bytes
DWORD cb; // incremental count of bytes
BYTE *hp; // byte pointer
DWORD dwTmp;
pbih = (PBITMAPINFOHEADER) pbi;
lpBits = (LPBYTE) GlobalAlloc(GMEM_FIXED, pbih->biSizeImage);
if (!lpBits)
{
MessageBox(hwnd,"da","da",MB_OK);
}
// Retrieve the color table (RGBQUAD array) and the bits
// (array of palette indices) from the DIB.
if (!GetDIBits(hDC, hBMP, 0, (WORD) pbih->biHeight, lpBits, pbi,
DIB_RGB_COLORS))
{
MessageBox(hwnd,"da","da",MB_OK);
}
// Create the .BMP file.
hf = CreateFile(pszFile,
GENERIC_READ | GENERIC_WRITE,
(DWORD) 0,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
(HANDLE) NULL);
if (hf == INVALID_HANDLE_VALUE)
MessageBox(hwnd,"da","da",MB_OK);
hdr.bfType = 0x4d42; // 0x42 = "B" 0x4d = "M"
// Compute the size of the entire file.
hdr.bfSize = (DWORD) (sizeof(BITMAPFILEHEADER) +
pbih->biSize + pbih->biClrUsed
* sizeof(RGBQUAD) + pbih->biSizeImage);
hdr.bfReserved1 = 0;
hdr.bfReserved2 = 0;
// Compute the offset to the array of color indices.
hdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) +
pbih->biSize + pbih->biClrUsed
* sizeof (RGBQUAD);
// Copy the BITMAPFILEHEADER into the .BMP file.
if (!WriteFile(hf, (LPVOID) &hdr, sizeof(BITMAPFILEHEADER),
(LPDWORD) &dwTmp, NULL))
{
MessageBox(hwnd,"da","da",MB_OK);
}
// Copy the BITMAPINFOHEADER and RGBQUAD array into the file.
if (!WriteFile(hf, (LPVOID) pbih, sizeof(BITMAPINFOHEADER)
+ pbih->biClrUsed * sizeof (RGBQUAD),
(LPDWORD) &dwTmp, ( NULL)))
MessageBox(hwnd,"da","da",MB_OK);
// Copy the array of color indices into the .BMP file.
dwTotal = cb = pbih->biSizeImage;
hp = lpBits;
if (!WriteFile(hf, (LPSTR) hp, (int) cb, (LPDWORD) &dwTmp,NULL))
MessageBox(hwnd,"da","da",MB_OK);
// Close the .BMP file.
if (!CloseHandle(hf))
MessageBox(hwnd,"da","da",MB_OK);
// Free memory.
GlobalFree((HGLOBAL)lpBits);
}
I guess i have wrong on call of BitBlt(hdc, 0, 0,cScreenX,cScreenY,memDC, 0, 0, SRCCOPY);
I must put the Height and the width of my bitmap?
