mirror of
https://github.com/reactos/reactos.git
synced 2024-11-06 06:33:08 +00:00
380 lines
12 KiB
C++
380 lines
12 KiB
C++
|
|
// ------------------------------------------------------------------
|
|
// Windows 2000 Graphics API Black Book
|
|
// Chapter 1 - Listing 1.5 (StretchBlt Zooming Demo)
|
|
//
|
|
// Created by Damon Chandler <dmc27@ee.cornell.edu>
|
|
// Updates can be downloaded at: <www.coriolis.com>
|
|
//
|
|
// Please do not hesistate to e-mail me at dmc27@ee.cornell.edu
|
|
// if you have any questions about this code.
|
|
// ------------------------------------------------------------------
|
|
|
|
// Modified by Aleksey Bragin (aleksey at studiocerebral.com)
|
|
// to support non-uniform scaling, and output via sretchdibits
|
|
// (type something in the command line to invoke this mode,
|
|
// in future it will be source BPP)
|
|
|
|
//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
|
|
#include <windows.h>
|
|
#include <stdio.h>
|
|
//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
|
|
|
|
|
|
HWND HListBox = NULL;
|
|
HWND VListBox = NULL;
|
|
const int ID_LISTBOX = 101;
|
|
const int ID_LISTBOX2 = 102;
|
|
BOOL useDIBits=FALSE; // How to display the image - via StretchDIBits
|
|
|
|
HINSTANCE HInst;
|
|
HINSTANCE HPrevInst;
|
|
TCHAR *cmdline;
|
|
const char* WndClassName = "GMainWnd";
|
|
LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
|
|
LPARAM LParam);
|
|
|
|
|
|
int APIENTRY WinMain(HINSTANCE HInstance, HINSTANCE HPrevInstance,
|
|
LPTSTR lpCmdLine, int nCmdShow)
|
|
{
|
|
HInst = HInstance;
|
|
HPrevInst = HPrevInstance;
|
|
cmdline = lpCmdLine;
|
|
|
|
WNDCLASS wc;
|
|
memset(&wc, 0, sizeof(WNDCLASS));
|
|
|
|
wc.style = CS_VREDRAW | CS_HREDRAW | CS_DBLCLKS;
|
|
wc.lpfnWndProc = MainWndProc;
|
|
wc.hInstance = HInstance;
|
|
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
|
|
wc.hbrBackground = reinterpret_cast<HBRUSH>(COLOR_BTNFACE + 1);
|
|
wc.lpszClassName = WndClassName;
|
|
|
|
if (RegisterClass(&wc))
|
|
{
|
|
HWND HWnd =
|
|
CreateWindow(WndClassName, TEXT("StretchBlt NonUniform Zooming Demo"),
|
|
WS_OVERLAPPEDWINDOW | WS_CAPTION |
|
|
WS_VISIBLE | WS_CLIPSIBLINGS,
|
|
0, 0, 675, 560,
|
|
NULL, NULL, HInst, NULL);
|
|
|
|
if (HWnd)
|
|
{
|
|
HListBox =
|
|
CreateWindowEx(WS_EX_CLIENTEDGE, "LISTBOX", "",
|
|
LBS_NOTIFY | WS_CHILD | WS_VISIBLE,
|
|
530, 5, 130, 150, HWnd,
|
|
reinterpret_cast<HMENU>(ID_LISTBOX),
|
|
HInst, NULL);
|
|
VListBox =
|
|
CreateWindowEx(WS_EX_CLIENTEDGE, "LISTBOX", "",
|
|
LBS_NOTIFY | WS_CHILD | WS_VISIBLE,
|
|
530, 5+170, 130, 150, HWnd,
|
|
reinterpret_cast<HMENU>(ID_LISTBOX2),
|
|
HInst, NULL);
|
|
|
|
if (HListBox && VListBox)
|
|
{
|
|
// horizontal zoom
|
|
SNDMSG(HListBox, LB_ADDSTRING, 0,
|
|
reinterpret_cast<LPARAM>("Zoom 25%"));
|
|
SNDMSG(HListBox, LB_ADDSTRING, 0,
|
|
reinterpret_cast<LPARAM>("Zoom 50%"));
|
|
SNDMSG(HListBox, LB_ADDSTRING, 0,
|
|
reinterpret_cast<LPARAM>("Zoom 75%"));
|
|
SNDMSG(HListBox, LB_ADDSTRING, 0,
|
|
reinterpret_cast<LPARAM>("Zoom 100%"));
|
|
SNDMSG(HListBox, LB_ADDSTRING, 0,
|
|
reinterpret_cast<LPARAM>("Zoom 125%"));
|
|
SNDMSG(HListBox, LB_ADDSTRING, 0,
|
|
reinterpret_cast<LPARAM>("Zoom 150%"));
|
|
SNDMSG(HListBox, LB_ADDSTRING, 0,
|
|
reinterpret_cast<LPARAM>("Zoom 200%"));
|
|
SNDMSG(HListBox, LB_ADDSTRING, 0,
|
|
reinterpret_cast<LPARAM>("Zoom 300%"));
|
|
// vertical zoom
|
|
SNDMSG(VListBox, LB_ADDSTRING, 0,
|
|
reinterpret_cast<LPARAM>("Zoom 25%"));
|
|
SNDMSG(VListBox, LB_ADDSTRING, 0,
|
|
reinterpret_cast<LPARAM>("Zoom 50%"));
|
|
SNDMSG(VListBox, LB_ADDSTRING, 0,
|
|
reinterpret_cast<LPARAM>("Zoom 75%"));
|
|
SNDMSG(VListBox, LB_ADDSTRING, 0,
|
|
reinterpret_cast<LPARAM>("Zoom 100%"));
|
|
SNDMSG(VListBox, LB_ADDSTRING, 0,
|
|
reinterpret_cast<LPARAM>("Zoom 125%"));
|
|
SNDMSG(VListBox, LB_ADDSTRING, 0,
|
|
reinterpret_cast<LPARAM>("Zoom 150%"));
|
|
SNDMSG(VListBox, LB_ADDSTRING, 0,
|
|
reinterpret_cast<LPARAM>("Zoom 200%"));
|
|
SNDMSG(VListBox, LB_ADDSTRING, 0,
|
|
reinterpret_cast<LPARAM>("Zoom 300%"));
|
|
|
|
}
|
|
|
|
ShowWindow(HWnd, nCmdShow);
|
|
UpdateWindow(HWnd);
|
|
|
|
MSG msg;
|
|
while (GetMessage(&msg, NULL, 0, 0))
|
|
{
|
|
TranslateMessage(&msg);
|
|
DispatchMessage(&msg);
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
//------------------------------------------------------------------
|
|
|
|
|
|
// image related
|
|
BITMAP bmp;
|
|
BITMAPINFO bmInfo;
|
|
char *bbits = NULL; // bitmap bits
|
|
const char* filename = "LENA.BMP";
|
|
HDC HMemDC = NULL;
|
|
HBITMAP HOldBmp = NULL;
|
|
|
|
// zooming related
|
|
float zoom_factor_h = 0.5;
|
|
float zoom_factor_v = 0.5;
|
|
RECT RDest = {5, 5, 0, 0};
|
|
enum {ID_ZOOM25, ID_ZOOM50, ID_ZOOM75, ID_ZOOM100,
|
|
ID_ZOOM125, ID_ZOOM150, ID_ZOOM200, ID_ZOOM300};
|
|
|
|
LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
|
|
LPARAM LParam)
|
|
{
|
|
switch (Msg)
|
|
{
|
|
case WM_CREATE:
|
|
{
|
|
// check commandline
|
|
if (strlen(cmdline) != 0)
|
|
{
|
|
|
|
useDIBits = TRUE;
|
|
}
|
|
else
|
|
useDIBits = FALSE;
|
|
|
|
// create a memory DC
|
|
HMemDC = CreateCompatibleDC(NULL);
|
|
if (HMemDC)
|
|
{
|
|
// load a bitmap from file
|
|
HBITMAP HBmp =
|
|
static_cast<HBITMAP>(
|
|
LoadImage(HInst, filename, IMAGE_BITMAP,
|
|
0, 0, LR_LOADFROMFILE)
|
|
);
|
|
if (HBmp)
|
|
{
|
|
// extract dimensions of the bitmap
|
|
GetObject(HBmp, sizeof(BITMAP), &bmp);
|
|
|
|
// fill the BITMAPINFO stucture for further use by StretchDIBits
|
|
bmInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
|
|
bmInfo.bmiHeader.biWidth = bmp.bmWidth;
|
|
bmInfo.bmiHeader.biHeight = bmp.bmHeight;
|
|
bmInfo.bmiHeader.biPlanes = 1;//bmp.bmPlanes;
|
|
bmInfo.bmiHeader.biBitCount = bmp.bmBitsPixel;
|
|
bmInfo.bmiHeader.biCompression = BI_RGB;
|
|
bmInfo.bmiHeader.biSizeImage = 0;
|
|
bmInfo.bmiHeader.biXPelsPerMeter = 0;
|
|
bmInfo.bmiHeader.biClrImportant = 0;
|
|
bmInfo.bmiHeader.biClrUsed = 0;
|
|
|
|
// associate the bitmap with the memory DC
|
|
HOldBmp = static_cast<HBITMAP>(
|
|
SelectObject(HMemDC, HBmp)
|
|
);
|
|
|
|
if (useDIBits)
|
|
{
|
|
bbits = new char[bmp.bmHeight*bmp.bmWidthBytes*(bmp.bmBitsPixel / 8)];
|
|
//GetDIBits(HMemDC, HBmp, 0, bmp.bmHeight, bbits, &bmInfo, DIB_RGB_COLORS);
|
|
|
|
// Here goes a temp hack, since GetDIBits doesn't exist in ReactOS yet
|
|
FILE *f = fopen(filename, "rb");
|
|
BITMAPFILEHEADER bmpHeader;
|
|
|
|
fread(&bmpHeader, sizeof(BITMAPFILEHEADER), 1, f);
|
|
fread(&bmInfo, sizeof(BITMAPINFO), 1, f);
|
|
fseek(f, bmpHeader.bfOffBits, SEEK_SET);
|
|
fread(bbits, bmp.bmHeight*bmp.bmWidthBytes*(bmp.bmBitsPixel / 8), 1, f);
|
|
|
|
fclose(f);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
case WM_COMMAND:
|
|
{
|
|
if (WParam == MAKEWPARAM(ID_LISTBOX, LBN_SELCHANGE) ||
|
|
WParam == MAKEWPARAM(ID_LISTBOX2, LBN_SELCHANGE))
|
|
{
|
|
switch (SNDMSG(HListBox, LB_GETCURSEL, 0, 0))
|
|
{
|
|
case ID_ZOOM25: zoom_factor_h = 0.25; break;
|
|
case ID_ZOOM50: zoom_factor_h = 0.50; break;
|
|
case ID_ZOOM75: zoom_factor_h = 0.75; break;
|
|
case ID_ZOOM100: zoom_factor_h = 1.00; break;
|
|
case ID_ZOOM125: zoom_factor_h = 1.25; break;
|
|
case ID_ZOOM150: zoom_factor_h = 1.50; break;
|
|
case ID_ZOOM200: zoom_factor_h = 2.00; break;
|
|
case ID_ZOOM300: zoom_factor_h = 3.00; break;
|
|
}
|
|
|
|
switch (SNDMSG(VListBox, LB_GETCURSEL, 0, 0))
|
|
{
|
|
case ID_ZOOM25: zoom_factor_v = 0.25; break;
|
|
case ID_ZOOM50: zoom_factor_v = 0.50; break;
|
|
case ID_ZOOM75: zoom_factor_v = 0.75; break;
|
|
case ID_ZOOM100: zoom_factor_v = 1.00; break;
|
|
case ID_ZOOM125: zoom_factor_v = 1.25; break;
|
|
case ID_ZOOM150: zoom_factor_v = 1.50; break;
|
|
case ID_ZOOM200: zoom_factor_v = 2.00; break;
|
|
case ID_ZOOM300: zoom_factor_v = 3.00; break;
|
|
}
|
|
|
|
// calculate the new width and height
|
|
const int new_width =
|
|
static_cast<int>(zoom_factor_h * bmp.bmWidth);
|
|
const int new_height =
|
|
static_cast<int>(zoom_factor_v * bmp.bmHeight);
|
|
|
|
// is zooming in?
|
|
bool zoom_in = (new_width > RDest.right - RDest.left);
|
|
|
|
// caculate the area that needs to be updated
|
|
RECT RUpdate = {
|
|
RDest.left, RDest.top,
|
|
RDest.left + max(new_width, RDest.right - RDest.left),
|
|
RDest.top + max(new_height, RDest.bottom - RDest.top)
|
|
};
|
|
|
|
// adjust the dimenstions of the
|
|
// destination rectangle
|
|
RDest.right = RDest.left + new_width;
|
|
RDest.bottom = RDest.top + new_height;
|
|
|
|
// create an update region from the XOR combination
|
|
// of the update and destination rectangles
|
|
HRGN HUpdateRgn = CreateRectRgnIndirect(&RUpdate);
|
|
HRGN HDestRgn = CreateRectRgnIndirect(&RDest);
|
|
int result =
|
|
CombineRgn(HUpdateRgn, HUpdateRgn, HDestRgn, RGN_XOR);
|
|
|
|
// incite a repaint
|
|
if (result != NULLREGION && result != ERROR)
|
|
{
|
|
InvalidateRgn(HWnd, HUpdateRgn, true);
|
|
RedrawWindow(HWnd, &RDest, NULL, RDW_NOERASE | RDW_INVALIDATE);
|
|
}
|
|
else if (result == NULLREGION)
|
|
{
|
|
InvalidateRect(HWnd, &RUpdate, zoom_in ? false : true);
|
|
}
|
|
|
|
// clean up
|
|
DeleteObject(HUpdateRgn);
|
|
DeleteObject(HDestRgn);
|
|
}
|
|
break;
|
|
}
|
|
case WM_PAINT:
|
|
{
|
|
PAINTSTRUCT ps;
|
|
const HDC Hdc = BeginPaint(HWnd, &ps);
|
|
#if 0
|
|
try
|
|
#endif
|
|
{
|
|
//
|
|
// TODO: add palette support (see Chapter 9)...
|
|
//
|
|
if (useDIBits)
|
|
{
|
|
if (RDest.right - RDest.left > 0)
|
|
{
|
|
if (zoom_factor_h < 1.0 || zoom_factor_v < 1.0)
|
|
{
|
|
SetStretchBltMode(Hdc, COLORONCOLOR);
|
|
}
|
|
|
|
// render the zoomed image
|
|
StretchDIBits(Hdc, RDest.left, RDest.top,
|
|
RDest.right - RDest.left,
|
|
RDest.bottom - RDest.top,
|
|
0, 0,
|
|
bmp.bmWidth, bmp.bmHeight,
|
|
bbits, &bmInfo,
|
|
DIB_RGB_COLORS,
|
|
SRCCOPY);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (RDest.right - RDest.left > 0)
|
|
{
|
|
|
|
// use BitBlt when not zooming
|
|
if (zoom_factor_h == 1.0 && zoom_factor_v == 1.0)
|
|
{
|
|
BitBlt(Hdc, RDest.left, RDest.top,
|
|
RDest.right - RDest.left,
|
|
RDest.bottom - RDest.top,
|
|
HMemDC, 0, 0,
|
|
SRCCOPY);
|
|
}
|
|
else
|
|
{
|
|
if (zoom_factor_h < 1.0 || zoom_factor_v < 1.0)
|
|
{
|
|
SetStretchBltMode(Hdc, COLORONCOLOR);
|
|
}
|
|
|
|
// render the zoomed image
|
|
StretchBlt(Hdc, RDest.left, RDest.top,
|
|
RDest.right - RDest.left,
|
|
RDest.bottom - RDest.top,
|
|
HMemDC, 0, 0,
|
|
bmp.bmWidth, bmp.bmHeight,
|
|
SRCCOPY);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#if 0
|
|
catch (...)
|
|
#endif
|
|
{
|
|
EndPaint(HWnd, &ps);
|
|
}
|
|
EndPaint(HWnd, &ps);
|
|
break;
|
|
}
|
|
case WM_DESTROY:
|
|
{
|
|
// clean up
|
|
DeleteObject(SelectObject(HMemDC, HOldBmp));
|
|
DeleteDC(HMemDC);
|
|
|
|
if (bbits)
|
|
delete bbits;
|
|
|
|
PostQuitMessage(0);
|
|
return 0;
|
|
}
|
|
}
|
|
return DefWindowProc(HWnd, Msg, WParam, LParam);
|
|
}
|
|
//------------------------------------------------------------------
|
|
|
|
|
|
|