Bitmap Resources on Win32
Author
I need to know how to display a bitmap that I have listed in my resource.rc file using Windows functions.
its not that simple when you are using win32 api heres a bitmap class
i know its alot of code thats why alot of people use SDL and allegro to hide the code for making a bitmap but if you want all your bitmaps to behave a diffrent then normal variables or if you want to create sub classes and such you can go the long route
if youll notice there are several construcors here one of witch dose load a bitmap from resource
//-----------------------------------------------------------------// Bitmap Class//-----------------------------------------------------------------class Bitmap{protected: // Member Variables HBITMAP m_hBitmap; int m_iWidth, m_iHeight; // Helper Methods void Free();public: // Constructor(s)/Destructor Bitmap(); Bitmap(HDC hDC, LPTSTR szFileName); Bitmap(HDC hDC, UINT uiResID, HINSTANCE hInstance); Bitmap(HDC hDC, int iWidth, int iHeight, COLORREF crColor = RGB(0, 0, 0)); virtual ~Bitmap(); // General Methods BOOL Create(HDC hDC, LPTSTR szFileName); BOOL Create(HDC hDC, UINT uiResID, HINSTANCE hInstance); BOOL Create(HDC hDC, int iWidth, int iHeight, COLORREF crColor); void Draw(HDC hDC, int x, int y, BOOL bTrans = FALSE, COLORREF crTransColor = RGB(255, 0, 255)); void DrawPart(HDC hDC, int x, int y, int xPart, int yPart, int wPart, int hPart, BOOL bTrans = FALSE, COLORREF crTransColor = RGB(255, 0, 255)); int GetWidth() { return m_iWidth; }; int GetHeight() { return m_iHeight; };};#include "Bitmap.h"//-----------------------------------------------------------------// Bitmap Constructor(s)/Destructor//-----------------------------------------------------------------Bitmap::Bitmap() : m_hBitmap(NULL), m_iWidth(0), m_iHeight(0){}// Create a bitmap from a fileBitmap::Bitmap(HDC hDC, LPTSTR szFileName) : m_hBitmap(NULL), m_iWidth(0), m_iHeight(0){ Create(hDC, szFileName);}// Create a bitmap from a resourceBitmap::Bitmap(HDC hDC, UINT uiResID, HINSTANCE hInstance) : m_hBitmap(NULL), m_iWidth(0), m_iHeight(0){ Create(hDC, uiResID, hInstance);}// Create a blank bitmap from scratchBitmap::Bitmap(HDC hDC, int iWidth, int iHeight, COLORREF crColor) : m_hBitmap(NULL), m_iWidth(0), m_iHeight(0){ Create(hDC, iWidth, iHeight, crColor);}Bitmap::~Bitmap(){ Free();}//-----------------------------------------------------------------// Bitmap Helper Methods//-----------------------------------------------------------------void Bitmap::Free(){ // Delete the bitmap graphics object if (m_hBitmap != NULL) { DeleteObject(m_hBitmap); m_hBitmap = NULL; }}//-----------------------------------------------------------------// Bitmap General Methods//-----------------------------------------------------------------BOOL Bitmap::Create(HDC hDC, LPTSTR szFileName){ // Free any previous bitmap info Free(); // Open the bitmap file HANDLE hFile = CreateFile(szFileName, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if (hFile == INVALID_HANDLE_VALUE) return FALSE; // Read the bitmap file header BITMAPFILEHEADER bmfHeader; DWORD dwBytesRead; BOOL bOK = ReadFile(hFile, &bmfHeader, sizeof(BITMAPFILEHEADER), &dwBytesRead, NULL); if ((!bOK) || (dwBytesRead != sizeof(BITMAPFILEHEADER)) || (bmfHeader.bfType != 0x4D42)) { CloseHandle(hFile); return FALSE; } BITMAPINFO* pBitmapInfo = (BITMAPINFO*)(new BITMAPINFO_256); if (pBitmapInfo != NULL) { // Read the bitmap info header bOK = ReadFile(hFile, pBitmapInfo, sizeof(BITMAPINFOHEADER), &dwBytesRead, NULL); if ((!bOK) || (dwBytesRead != sizeof(BITMAPINFOHEADER))) { CloseHandle(hFile); Free(); return FALSE; } // Store the width and height of the bitmap m_iWidth = (int)pBitmapInfo->bmiHeader.biWidth; m_iHeight = (int)pBitmapInfo->bmiHeader.biHeight; // Skip (forward or backward) to the color info, if necessary if (pBitmapInfo->bmiHeader.biSize != sizeof(BITMAPINFOHEADER)) SetFilePointer(hFile, pBitmapInfo->bmiHeader.biSize - sizeof (BITMAPINFOHEADER), NULL, FILE_CURRENT); // Read the color info bOK = ReadFile(hFile, pBitmapInfo->bmiColors, pBitmapInfo->bmiHeader.biClrUsed * sizeof(RGBQUAD), &dwBytesRead, NULL); // Get a handle to the bitmap and copy the image bits PBYTE pBitmapBits; m_hBitmap = CreateDIBSection(hDC, pBitmapInfo, DIB_RGB_COLORS, (PVOID*)&pBitmapBits, NULL, 0); if ((m_hBitmap != NULL) && (pBitmapBits != NULL)) { SetFilePointer(hFile, bmfHeader.bfOffBits, NULL, FILE_BEGIN); bOK = ReadFile(hFile, pBitmapBits, pBitmapInfo->bmiHeader.biSizeImage, &dwBytesRead, NULL); if (bOK) return TRUE; } } // Something went wrong, so cleanup everything Free(); return FALSE;}BOOL Bitmap::Create(HDC hDC, UINT uiResID, HINSTANCE hInstance){ // Free any previous DIB info Free(); // Find the bitmap resource HRSRC hResInfo = FindResource(hInstance, MAKEINTRESOURCE(uiResID), RT_BITMAP); if (hResInfo == NULL) return FALSE; // Load the bitmap resource HGLOBAL hMemBitmap = LoadResource(hInstance, hResInfo); if (hMemBitmap == NULL) return FALSE; // Lock the resource and access the entire bitmap image PBYTE pBitmapImage = (BYTE*)LockResource(hMemBitmap); if (pBitmapImage == NULL) { FreeResource(hMemBitmap); return FALSE; } // Store the width and height of the bitmap BITMAPINFO* pBitmapInfo = (BITMAPINFO*)pBitmapImage; m_iWidth = (int)pBitmapInfo->bmiHeader.biWidth; m_iHeight = (int)pBitmapInfo->bmiHeader.biHeight; // Get a handle to the bitmap and copy the image bits PBYTE pBitmapBits; m_hBitmap = CreateDIBSection(hDC, pBitmapInfo, DIB_RGB_COLORS, (PVOID*)&pBitmapBits, NULL, 0); if ((m_hBitmap != NULL) && (pBitmapBits != NULL)) { const PBYTE pTempBits = pBitmapImage + pBitmapInfo->bmiHeader.biSize + pBitmapInfo->bmiHeader.biClrUsed * sizeof(RGBQUAD); CopyMemory(pBitmapBits, pTempBits, pBitmapInfo->bmiHeader.biSizeImage); // Unlock and free the bitmap graphics object UnlockResource(hMemBitmap); FreeResource(hMemBitmap); return TRUE; } // Something went wrong, so cleanup everything UnlockResource(hMemBitmap); FreeResource(hMemBitmap); Free(); return FALSE;}BOOL Bitmap::Create(HDC hDC, int iWidth, int iHeight, COLORREF crColor){ // Create a blank bitmap m_hBitmap = CreateCompatibleBitmap(hDC, iWidth, iHeight); if (m_hBitmap == NULL) return FALSE; // Set the width and height m_iWidth = iWidth; m_iHeight = iHeight; // Create a memory device context to draw on the bitmap HDC hMemDC = CreateCompatibleDC(hDC); // Create a solid brush to fill the bitmap HBRUSH hBrush = CreateSolidBrush(crColor); // Select the bitmap into the device context HBITMAP hOldBitmap = (HBITMAP)SelectObject(hMemDC, m_hBitmap); // Fill the bitmap with a solid color RECT rcBitmap = { 0, 0, m_iWidth, m_iHeight }; FillRect(hMemDC, &rcBitmap, hBrush); // Cleanup SelectObject(hMemDC, hOldBitmap); DeleteDC(hMemDC); DeleteObject(hBrush); return TRUE;}void Bitmap::Draw(HDC hDC, int x, int y, BOOL bTrans, COLORREF crTransColor){ DrawPart(hDC, x, y, 0, 0, GetWidth(), GetHeight(), bTrans, crTransColor);}void Bitmap::DrawPart(HDC hDC, int x, int y, int xPart, int yPart, int wPart, int hPart, BOOL bTrans, COLORREF crTransColor){ if (m_hBitmap != NULL) { // Create a memory device context for the bitmap HDC hMemDC = CreateCompatibleDC(hDC); // Select the bitmap into the device context HBITMAP hOldBitmap = (HBITMAP)SelectObject(hMemDC, m_hBitmap); // Draw the bitmap to the destination device context //if (bTrans) // TransparentBlt(hDC, x, y, wPart, hPart, hMemDC, xPart, yPart, // wPart, hPart, crTransColor); //else BitBlt(hDC, x, y, wPart, hPart, hMemDC, xPart, yPart, SRCCOPY); // Restore and delete the memory device context SelectObject(hMemDC, hOldBitmap); DeleteDC(hMemDC); }}i know its alot of code thats why alot of people use SDL and allegro to hide the code for making a bitmap but if you want all your bitmaps to behave a diffrent then normal variables or if you want to create sub classes and such you can go the long route
if youll notice there are several construcors here one of witch dose load a bitmap from resource
This topic is closed to new replies.
Advertisement
Popular Topics
Advertisement
