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381 lines
12 KiB
C++
381 lines
12 KiB
C++
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// ------------------------------------------------------------------
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// Windows 2000 Graphics API Black Book
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// Chapter 1 - Listing 1.5 (StretchBlt Zooming Demo)
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//
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// Created by Damon Chandler <dmc27@ee.cornell.edu>
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// Updates can be downloaded at: <www.coriolis.com>
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//
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// Please do not hesistate to e-mail me at dmc27@ee.cornell.edu
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// if you have any questions about this code.
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// ------------------------------------------------------------------
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// Modified by Aleksey Bragin (aleksey at studiocerebral.com)
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// to support non-uniform scaling, and output via sretchdibits
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// (type something in the command line to invoke this mode,
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// in future it will be source BPP)
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//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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#include <windows.h>
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#include <stdio.h>
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//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
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HWND HListBox = NULL;
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HWND VListBox = NULL;
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const int ID_LISTBOX = 101;
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const int ID_LISTBOX2 = 102;
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BOOL useDIBits=FALSE; // How to display the image - via StretchDIBits
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HINSTANCE HInst;
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HINSTANCE HPrevInst;
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TCHAR *cmdline;
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const char* WndClassName = "GMainWnd";
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LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
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LPARAM LParam);
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int APIENTRY WinMain(HINSTANCE HInstance, HINSTANCE HPrevInstance,
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LPTSTR lpCmdLine, int nCmdShow)
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{
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HInst = HInstance;
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HPrevInst = HPrevInstance;
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cmdline = lpCmdLine;
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WNDCLASS wc;
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memset(&wc, 0, sizeof(WNDCLASS));
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wc.style = CS_VREDRAW | CS_HREDRAW | CS_DBLCLKS;
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wc.lpfnWndProc = MainWndProc;
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wc.hInstance = HInstance;
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wc.hCursor = LoadCursor(NULL, IDC_ARROW);
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wc.hbrBackground = reinterpret_cast<HBRUSH>(COLOR_BTNFACE + 1);
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wc.lpszClassName = WndClassName;
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if (RegisterClass(&wc))
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{
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HWND HWnd =
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CreateWindow(WndClassName, TEXT("StretchBlt NonUniform Zooming Demo"),
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WS_OVERLAPPEDWINDOW | WS_CAPTION |
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WS_VISIBLE | WS_CLIPSIBLINGS,
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0, 0, 675, 560,
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NULL, NULL, HInst, NULL);
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if (HWnd)
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{
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HListBox =
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CreateWindowEx(WS_EX_CLIENTEDGE, "LISTBOX", "",
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LBS_NOTIFY | WS_CHILD | WS_VISIBLE,
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530, 5, 130, 150, HWnd,
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reinterpret_cast<HMENU>(ID_LISTBOX),
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HInst, NULL);
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VListBox =
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CreateWindowEx(WS_EX_CLIENTEDGE, "LISTBOX", "",
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LBS_NOTIFY | WS_CHILD | WS_VISIBLE,
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530, 5+170, 130, 150, HWnd,
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reinterpret_cast<HMENU>(ID_LISTBOX2),
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HInst, NULL);
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if (HListBox && VListBox)
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{
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// horizontal zoom
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SNDMSG(HListBox, LB_ADDSTRING, 0,
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reinterpret_cast<LPARAM>("Zoom 25%"));
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SNDMSG(HListBox, LB_ADDSTRING, 0,
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reinterpret_cast<LPARAM>("Zoom 50%"));
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SNDMSG(HListBox, LB_ADDSTRING, 0,
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reinterpret_cast<LPARAM>("Zoom 75%"));
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SNDMSG(HListBox, LB_ADDSTRING, 0,
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reinterpret_cast<LPARAM>("Zoom 100%"));
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SNDMSG(HListBox, LB_ADDSTRING, 0,
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reinterpret_cast<LPARAM>("Zoom 125%"));
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SNDMSG(HListBox, LB_ADDSTRING, 0,
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reinterpret_cast<LPARAM>("Zoom 150%"));
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SNDMSG(HListBox, LB_ADDSTRING, 0,
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reinterpret_cast<LPARAM>("Zoom 200%"));
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SNDMSG(HListBox, LB_ADDSTRING, 0,
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reinterpret_cast<LPARAM>("Zoom 300%"));
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// vertical zoom
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SNDMSG(VListBox, LB_ADDSTRING, 0,
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reinterpret_cast<LPARAM>("Zoom 25%"));
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SNDMSG(VListBox, LB_ADDSTRING, 0,
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reinterpret_cast<LPARAM>("Zoom 50%"));
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SNDMSG(VListBox, LB_ADDSTRING, 0,
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reinterpret_cast<LPARAM>("Zoom 75%"));
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SNDMSG(VListBox, LB_ADDSTRING, 0,
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reinterpret_cast<LPARAM>("Zoom 100%"));
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SNDMSG(VListBox, LB_ADDSTRING, 0,
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reinterpret_cast<LPARAM>("Zoom 125%"));
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SNDMSG(VListBox, LB_ADDSTRING, 0,
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reinterpret_cast<LPARAM>("Zoom 150%"));
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SNDMSG(VListBox, LB_ADDSTRING, 0,
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reinterpret_cast<LPARAM>("Zoom 200%"));
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SNDMSG(VListBox, LB_ADDSTRING, 0,
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reinterpret_cast<LPARAM>("Zoom 300%"));
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}
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ShowWindow(HWnd, nCmdShow);
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UpdateWindow(HWnd);
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MSG msg;
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while (GetMessage(&msg, NULL, 0, 0))
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{
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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}
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}
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}
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return 0;
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}
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//------------------------------------------------------------------
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// image related
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BITMAP bmp;
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BITMAPINFO bmInfo;
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char *bbits = NULL; // bitmap bits
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const char* filename = "LENA.BMP";
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HDC HMemDC = NULL;
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HBITMAP HOldBmp = NULL;
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// zooming related
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float zoom_factor_h = 0.5;
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float zoom_factor_v = 0.5;
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RECT RDest = {5, 5, 0, 0};
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enum {ID_ZOOM25, ID_ZOOM50, ID_ZOOM75, ID_ZOOM100,
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ID_ZOOM125, ID_ZOOM150, ID_ZOOM200, ID_ZOOM300};
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LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
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LPARAM LParam)
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{
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switch (Msg)
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{
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case WM_CREATE:
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{
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// check commandline
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if (strlen(cmdline) != 0)
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{
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useDIBits = TRUE;
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}
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else
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useDIBits = FALSE;
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// create a memory DC
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HMemDC = CreateCompatibleDC(NULL);
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if (HMemDC)
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{
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// load a bitmap from file
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HBITMAP HBmp =
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static_cast<HBITMAP>(
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LoadImage(HInst, filename, IMAGE_BITMAP,
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0, 0, LR_LOADFROMFILE)
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);
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if (HBmp)
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{
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// extract dimensions of the bitmap
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GetObject(HBmp, sizeof(BITMAP), &bmp);
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// fill the BITMAPINFO stucture for further use by StretchDIBits
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bmInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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bmInfo.bmiHeader.biWidth = bmp.bmWidth;
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bmInfo.bmiHeader.biHeight = bmp.bmHeight;
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bmInfo.bmiHeader.biPlanes = 1;//bmp.bmPlanes;
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bmInfo.bmiHeader.biBitCount = bmp.bmBitsPixel;
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bmInfo.bmiHeader.biCompression = BI_RGB;
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bmInfo.bmiHeader.biSizeImage = 0;
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bmInfo.bmiHeader.biXPelsPerMeter = 0;
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bmInfo.bmiHeader.biClrImportant = 0;
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bmInfo.bmiHeader.biClrUsed = 0;
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// associate the bitmap with the memory DC
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HOldBmp = static_cast<HBITMAP>(
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SelectObject(HMemDC, HBmp)
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);
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if (useDIBits)
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{
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bbits = new char[bmp.bmHeight*bmp.bmWidthBytes*(bmp.bmBitsPixel / 8)];
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//GetDIBits(HMemDC, HBmp, 0, bmp.bmHeight, bbits, &bmInfo, DIB_RGB_COLORS);
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// Here goes a temp hack, since GetDIBits doesn't exist in ReactOS yet
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FILE *f = fopen(filename, "rb");
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BITMAPFILEHEADER bmpHeader;
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fread(&bmpHeader, sizeof(BITMAPFILEHEADER), 1, f);
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fread(&bmInfo, sizeof(BITMAPINFO), 1, f);
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fseek(f, bmpHeader.bfOffBits, SEEK_SET);
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fread(bbits, bmp.bmHeight*bmp.bmWidthBytes*(bmp.bmBitsPixel / 8), 1, f);
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fclose(f);
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}
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}
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}
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}
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case WM_COMMAND:
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{
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if (WParam == MAKEWPARAM(ID_LISTBOX, LBN_SELCHANGE) ||
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WParam == MAKEWPARAM(ID_LISTBOX2, LBN_SELCHANGE))
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{
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switch (SNDMSG(HListBox, LB_GETCURSEL, 0, 0))
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{
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case ID_ZOOM25: zoom_factor_h = 0.25; break;
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case ID_ZOOM50: zoom_factor_h = 0.50; break;
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case ID_ZOOM75: zoom_factor_h = 0.75; break;
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case ID_ZOOM100: zoom_factor_h = 1.00; break;
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case ID_ZOOM125: zoom_factor_h = 1.25; break;
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case ID_ZOOM150: zoom_factor_h = 1.50; break;
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case ID_ZOOM200: zoom_factor_h = 2.00; break;
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case ID_ZOOM300: zoom_factor_h = 3.00; break;
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}
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switch (SNDMSG(VListBox, LB_GETCURSEL, 0, 0))
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{
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case ID_ZOOM25: zoom_factor_v = 0.25; break;
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case ID_ZOOM50: zoom_factor_v = 0.50; break;
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case ID_ZOOM75: zoom_factor_v = 0.75; break;
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case ID_ZOOM100: zoom_factor_v = 1.00; break;
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case ID_ZOOM125: zoom_factor_v = 1.25; break;
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case ID_ZOOM150: zoom_factor_v = 1.50; break;
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case ID_ZOOM200: zoom_factor_v = 2.00; break;
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case ID_ZOOM300: zoom_factor_v = 3.00; break;
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}
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// calculate the new width and height
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const int new_width =
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static_cast<int>(zoom_factor_h * bmp.bmWidth);
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const int new_height =
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static_cast<int>(zoom_factor_v * bmp.bmHeight);
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// is zooming in?
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bool zoom_in = (new_width > RDest.right - RDest.left);
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// caculate the area that needs to be updated
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RECT RUpdate = {
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RDest.left, RDest.top,
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RDest.left + max(new_width, RDest.right - RDest.left),
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RDest.top + max(new_height, RDest.bottom - RDest.top)
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};
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// adjust the dimenstions of the
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// destination rectangle
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RDest.right = RDest.left + new_width;
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RDest.bottom = RDest.top + new_height;
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// create an update region from the XOR combination
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// of the update and destination rectangles
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HRGN HUpdateRgn = CreateRectRgnIndirect(&RUpdate);
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HRGN HDestRgn = CreateRectRgnIndirect(&RDest);
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int result =
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CombineRgn(HUpdateRgn, HUpdateRgn, HDestRgn, RGN_XOR);
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// incite a repaint
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if (result != NULLREGION && result != ERROR)
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{
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InvalidateRgn(HWnd, HUpdateRgn, true);
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RedrawWindow(HWnd, &RDest, NULL, RDW_NOERASE | RDW_INVALIDATE);
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}
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else if (result == NULLREGION)
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{
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InvalidateRect(HWnd, &RUpdate, zoom_in ? false : true);
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}
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// clean up
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DeleteObject(HUpdateRgn);
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DeleteObject(HDestRgn);
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}
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break;
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}
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case WM_PAINT:
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{
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PAINTSTRUCT ps;
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const HDC Hdc = BeginPaint(HWnd, &ps);
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#if 0
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try
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#endif
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{
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//
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// TODO: add palette support (see Chapter 9)...
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//
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if (useDIBits)
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{
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if (RDest.right - RDest.left > 0)
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{
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if (zoom_factor_h < 1.0 || zoom_factor_v < 1.0)
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{
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SetStretchBltMode(Hdc, COLORONCOLOR);
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}
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// render the zoomed image
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StretchDIBits(Hdc, RDest.left, RDest.top,
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RDest.right - RDest.left,
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RDest.bottom - RDest.top,
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0, 0,
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bmp.bmWidth, bmp.bmHeight,
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bbits, &bmInfo,
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DIB_RGB_COLORS,
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SRCCOPY);
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}
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}
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else
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{
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if (RDest.right - RDest.left > 0)
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{
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// use BitBlt when not zooming
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if (zoom_factor_h == 1.0 && zoom_factor_v == 1.0)
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{
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BitBlt(Hdc, RDest.left, RDest.top,
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RDest.right - RDest.left,
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RDest.bottom - RDest.top,
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HMemDC, 0, 0,
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SRCCOPY);
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}
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else
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{
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if (zoom_factor_h < 1.0 || zoom_factor_v < 1.0)
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{
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SetStretchBltMode(Hdc, COLORONCOLOR);
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}
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// render the zoomed image
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StretchBlt(Hdc, RDest.left, RDest.top,
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RDest.right - RDest.left,
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RDest.bottom - RDest.top,
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HMemDC, 0, 0,
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bmp.bmWidth, bmp.bmHeight,
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SRCCOPY);
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}
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}
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}
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}
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#if 0
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catch (...)
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#endif
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{
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EndPaint(HWnd, &ps);
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}
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EndPaint(HWnd, &ps);
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break;
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}
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case WM_DESTROY:
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{
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// clean up
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DeleteObject(SelectObject(HMemDC, HOldBmp));
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DeleteDC(HMemDC);
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if (bbits)
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delete[] bbits;
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PostQuitMessage(0);
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return 0;
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}
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}
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return DefWindowProc(HWnd, Msg, WParam, LParam);
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}
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//------------------------------------------------------------------
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