t-transparent-memory-dc.zip

// t_transparent_memory_dc.cpp : Defines the entry point for the application. // #include "framework.h" #include "t_transparent_memory_dc.h" #include <atlconv.h> #include <gdiplus.h> #include <vector> #pragma comment(lib, "gdiplus.lib") #define MAX_LOADSTRING 100 #define IMAGE_PATH L"test.wmf" #define ORIG_W 175 #define ORIG_H 188 #define RADIO 1 #define IMAGE_W (int)(ORIG_W * RADIO) #define IMAGE_H (int)(ORIG_H * RADIO) // Global Variables: HINSTANCE hInst; // current instance WCHAR szTitle[MAX_LOADSTRING]; // The title bar text WCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name Gdiplus::GdiplusStartupInput g_gsi; ULONG_PTR g_token; #pragma pack(1) typedef struct tagWIN16RECT { WORD left; WORD top; WORD right; WORD bottom; } WIN16RECT; typedef struct tagPLACEABLEMETAHEADER { DWORD key; WORD hmf; WIN16RECT bbox; WORD inch; DWORD reserved; WORD checksum; } PLACEABLEMETAHEADER; #pragma pack() HENHMETAFILE WINAPI convert_wmf_to_emf(IN LPCWSTR meta_file) { HANDLE hfile = CreateFileW(meta_file, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if (!hfile || INVALID_HANDLE_VALUE == hfile) { return NULL; } DWORD dwsize = GetFileSize(hfile, NULL); std::vector<BYTE> data(dwsize); DWORD dwread = -1; BOOL bret = ReadFile(hfile, &data[0], dwsize, &dwread, NULL); CloseHandle(hfile); HENHMETAFILE hemf = NULL; if (bret) { PLACEABLEMETAHEADER* pmh = (PLACEABLEMETAHEADER*)&data[0]; int offset = -1; if (pmh->key != 0x9AC6CDD7) offset = 0; else offset = sizeof(PLACEABLEMETAHEADER); hemf = SetWinMetaFileBits((UINT)data.size(), &data[offset], NULL, NULL); } return hemf; } void DrawTransparentBitmap(HDC hdc, HBITMAP hBitmap, short xStart, short yStart, COLORREF cTransparentColor) { BITMAP bm; COLORREF cColor; HBITMAP bmAndBack, bmAndObject, bmAndMem, bmSave; HBITMAP bmBackOld, bmObjectOld, bmMemOld, bmSaveOld; HDC hdcMem, hdcBack, hdcObject, hdcTemp, hdcSave; POINT ptSize; hdcTemp = CreateCompatibleDC(hdc); SelectObject(hdcTemp, hBitmap); // Select the bitmap GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&bm); ptSize.x = bm.bmWidth; // Get width of bitmap ptSize.y = bm.bmHeight; // Get height of bitmap DPtoLP(hdcTemp, &ptSize, 1); // Convert from device // Create some DCs to hold temporary data. hdcBack = CreateCompatibleDC(hdc); hdcObject = CreateCompatibleDC(hdc); hdcMem = CreateCompatibleDC(hdc); hdcSave = CreateCompatibleDC(hdc); // Create a bitmap for each DC. DCs are required for a number of // GDI functions. // Monochrome DC bmAndBack = CreateBitmap(ptSize.x, ptSize.y, 1, 1, NULL); // Monochrome DC bmAndObject = CreateBitmap(ptSize.x, ptSize.y, 1, 1, NULL); bmAndMem = CreateCompatibleBitmap(hdc, ptSize.x, ptSize.y); bmSave = CreateCompatibleBitmap(hdc, ptSize.x, ptSize.y); // Each DC must select a bitmap object to store pixel data. bmBackOld = (HBITMAP)SelectObject(hdcBack, bmAndBack); bmObjectOld = (HBITMAP)SelectObject(hdcObject, bmAndObject); bmMemOld = (HBITMAP)SelectObject(hdcMem, bmAndMem); bmSaveOld = (HBITMAP)SelectObject(hdcSave, bmSave); // Set proper mapping mode. SetMapMode(hdcTemp, GetMapMode(hdc)); // Save the bitmap sent here, because it will be overwritten. BitBlt(hdcSave, 0, 0, ptSize.x, ptSize.y, hdcTemp, 0, 0, SRCCOPY); // Set the background color of the source DC to the color. // contained in the parts of the bitmap that should be transparent cColor = SetBkColor(hdcTemp, cTransparentColor); // Create the object mask for the bitmap by performing a BitBlt // from the source bitmap to a monochrome bitmap. BitBlt(hdcObject, 0, 0, ptSize.x, ptSize.y, hdcTemp, 0, 0, SRCCOPY); BitBlt(hdc, ptSize.x * 1, ptSize.y * 1, ptSize.x, ptSize.y, hdcObject, 0, 0, SRCCOPY); // Set the background color of the source DC back to the original color. SetBkColor(hdcTemp, cColor); // Create the inverse of the object mask. BitBlt(hdcBack, 0, 0, ptSize.x, ptSize.y, hdcObject, 0, 0, NOTSRCCOPY); BitBlt(hdc, ptSize.x * 2, ptSize.y * 1, ptSize.x, ptSize.y, hdcBack, 0, 0, SRCCOPY); // Copy the background of the main DC to the destination. BitBlt(hdcMem, 0, 0, ptSize.x, ptSize.y, hdc, xStart, yStart, SRCCOPY); BitBlt(hdc, ptSize.x * 3, ptSize.y * 1, ptSize.x, ptSize.y, hdcMem, 0, 0, SRCCOPY); // Mask out the places where the bitmap will be placed. BitBlt(hdcMem, 0, 0, ptSize.x, ptSize.y, hdcObject, 0, 0, SRCAND); BitBlt(hdc, ptSize.x * 4, ptSize.y * 1, ptSize.x, ptSize.y, hdcMem, 0, 0, SRCCOPY); // Mask out the transparent colored pixels on the bitmap. BitBlt(hdcTemp, 0, 0, ptSize.x, ptSize.y, hdcBack, 0, 0, SRCAND); BitBlt(hdc, ptSize.x * 5, ptSize.y * 1, ptSize.x, ptSize.y, hdcTemp, 0, 0, SRCCOPY); // XOR the bitmap with the background on the destination DC. BitBlt(hdcMem, 0, 0, ptSize.x, ptSize.y, hdcTemp, 0, 0, SRCPAINT); BitBlt(hdc, ptSize.x * 6, ptSize.y * 1, ptSize.x, ptSize.y, hdcMem, 0, 0, SRCCOPY); // Copy the destination to the screen. BitBlt(hdc, xStart, yStart, ptSize.x, ptSize.y, hdcMem, 0, 0, SRCCOPY); // Place the original bitmap back into the bitmap sent here. BitBlt(hdcTemp, 0, 0, ptSize.x, ptSize.y, hdcSave, 0, 0, SRCCOPY); // Delete the memory bitmaps. DeleteObject(SelectObject(hdcBack, bmBackOld)); DeleteObject(SelectObject(hdcObject, bmObjectOld)); DeleteObject(SelectObject(hdcMem, bmMemOld)); DeleteObject(SelectObject(hdcSave, bmSaveOld)); // Delete the memory DCs. DeleteDC(hdcMem); DeleteDC(hdcBack); DeleteDC(hdcObject); DeleteDC(hdcSave); DeleteDC(hdcTemp); } void t_gdi_paint_hbitmap(HDC hdc, HBITMAP hbitmap) { HDC mem_dc = CreateCompatibleDC(hdc); HGDIOBJ old = SelectObject(mem_dc, hbitmap); if (!old) MessageBox(0, L"SelectObject return NULL", 0, 0); BITMAP bmpinfo; GetObject(hbitmap, sizeof(bmpinfo), &bmpinfo); BitBlt(hdc, 0, 0, bmpinfo.bmWidth, bmpinfo.bmHeight, mem_dc, 0, 0, SRCCOPY); } void t_gdiplus_paint_hbitmap(HDC hdc, HBITMAP hbitmap) { BITMAP bmpinfo; GetObject(hbitmap, sizeof(bmpinfo), &bmpinfo); Gdiplus::Bitmap bitmap(hbitmap, NULL); Gdiplus::Graphics g(hdc); g.DrawImage(&bitmap, bitmap.GetWidth(), 0, bitmap.GetWidth(), bitmap.GetHeight()); } void t_transparent_memory_dc(HDC hdc) { HBITMAP mem_bmp = NULL; BITMAPINFOHEADER bih = { 0 }; bih.biSize = sizeof(BITMAPINFOHEADER); bih.biWidth = IMAGE_W; bih.biHeight = -IMAGE_H; bih.biPlanes = 1; bih.biBitCount = 32; bih.biCompression = BI_RGB; bih.biSizeImage = 0; bih.biXPelsPerMeter = 0; bih.biYPelsPerMeter = 0; bih.biClrUsed = 0; bih.biClrImportant = 0; BITMAPINFO bi = { 0 }; bi.bmiHeader = bih; int len = IMAGE_W * IMAGE_H; PBYTE pbits = new BYTE[len * 4]; memset(pbits, 0, len * 4); HDC dc = CreateDC(L"DISPLAY", NULL, NULL, NULL); mem_bmp = CreateDIBitmap(dc, &bih, CBM_INIT, pbits, &bi, DIB_RGB_COLORS); DeleteDC(dc); HDC mem_dc = CreateCompatibleDC(NULL); HGDIOBJ old_gdi = SelectObject(mem_dc, mem_bmp); RECT rc{ 0, 0, IMAGE_W, IMAGE_H }; HBRUSH hbrush = CreateSolidBrush(RGB(255, 255, 255)); FillRect(mem_dc, &rc, hbrush); HENHMETAFILE hemf = convert_wmf_to_emf(IMAGE_PATH); if (hemf) { PlayEnhMetaFile(hdc, hemf, &rc); PlayEnhMetaFile(mem_dc, hemf, &rc); // BitBlt(hdc, 0, 0, IMAGE_W, IMAGE_H, mem_dc, 0, 0, SRCCOPY); DeleteEnhMetaFile(hemf); } SelectObject(mem_dc, old_gdi); // t_gdi_paint_hbitmap(hdc, mem_bmp); // t_gdiplus_paint_hbitmap(hdc, mem_bmp); DrawTransparentBitmap(hdc, mem_bmp, 0, IMAGE_H, RGB(255, 255, 255)); DeleteObject(mem_bmp); DeleteDC(mem_dc); } void desc(HDC hdc) {