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/**
* Copyright: Mike Wey 2011
* License: zlib (See accompanying LICENSE file)
* Authors: Mike Wey
*/
module dmagick.internal.Windows;
import core.sys.windows.windows;
import dmagick.Image;
import dmagick.Exception;
import dmagick.Geometry;
Window[HWND] windows;
class Window
{
Image image;
size_t height;
size_t width;
WNDCLASS wndclass;
HINSTANCE hInstance;
HWND hwnd;
MSG msg;
this(Image image)
{
this.image = image;
height = image.rows;
width = image.columns;
hInstance = cast(HINSTANCE) GetModuleHandleA(null);
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = &WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIconA(null, IDI_APPLICATION);
wndclass.hCursor = LoadCursorA(null, IDC_ARROW);
wndclass.hbrBackground = null;
wndclass.lpszMenuName = "DMagick";
wndclass.lpszClassName = "DMagick";
if (!RegisterClassA(&wndclass))
throw new DMagickException("This program requires Windows NT!");
RECT rect = RECT(0,0, width,height);
AdjustWindowRect(&rect, WS_OVERLAPPEDWINDOW, false);
hwnd = CreateWindowA("DMagick", "DMagick", WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, rect.right-rect.left, rect.bottom-rect.top,
null, null, hInstance, null);
windows[hwnd] = this;
}
void display()
{
ShowWindow(hwnd, SW_SHOWNORMAL);
UpdateWindow(hwnd);
while (GetMessageA(&msg, null, 0, 0))
{
TranslateMessage(&msg);
DispatchMessageA(&msg);
}
}
extern(Windows) static LRESULT WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int cxClient, cyClient, cxSource, cySource;
int x, y;
HDC hdc;
PAINTSTRUCT ps;
static HDC hdcMem;
static HBITMAP hbmMem;
static HANDLE hOld;
RECT rect;
switch (message)
{
case WM_SIZE:
cxClient = LOWORD(lParam);
cyClient = HIWORD(lParam);
return 0;
case WM_ERASEBKGND: // don't redraw bg
return 1;
case WM_PAINT:
{
// Get DC for window
hdc = BeginPaint(hwnd, &ps);
// Create an off-screen DC for double-buffering
hdcMem = CreateCompatibleDC(hdc);
hbmMem = CreateCompatibleBitmap(hdc, cxClient, cyClient);
hOld = SelectObject(hdcMem, hbmMem);
// Draw into hdcMem
GetClientRect(hwnd, &rect);
FillRect(hdcMem, &rect, GetStockObject(BLACK_BRUSH));
windows[hwnd].DrawAlphaBlend(hwnd, hdcMem);
// Transfer the off-screen DC to the screen
BitBlt(hdc, 0, 0, cxClient, cyClient, hdcMem, 0, 0, SRCCOPY);
// Free-up the off-screen DC
SelectObject(hdcMem, hOld);
DeleteObject(hbmMem);
DeleteDC (hdcMem);
EndPaint(hwnd, &ps);
return 0;
}
case WM_DESTROY:
windows[hwnd] = null;
PostQuitMessage(0);
return 0;
default:
}
return DefWindowProcA(hwnd, message, wParam, lParam);
}
void DrawAlphaBlend(HWND hWnd, HDC hdcwnd)
{
HDC hdc; // handle of the DC we will create
HBITMAP hbitmap; // bitmap handle
BITMAPINFO bmi; // bitmap header
VOID* pvBits; // pointer to DIB section
ULONG ulWindowWidth, ulWindowHeight; // window width/height
RECT rt; // used for getting window dimensions
// get window dimensions
GetClientRect(hWnd, &rt);
// calculate window width/height
ulWindowWidth = rt.right - rt.left;
ulWindowHeight = rt.bottom - rt.top;
// make sure we have at least some window size
if (ulWindowWidth < 1 || ulWindowHeight < 1)
return;
// create a DC for our bitmap -- the source DC for GdiAlphaBlend
hdc = CreateCompatibleDC(hdcwnd);
// setup bitmap info
bmi.bmiHeader.biSize = BITMAPINFOHEADER.sizeof;
bmi.bmiHeader.biWidth = width;
bmi.bmiHeader.biHeight = -height; // must be inverted so Y axis is at top
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 32; // four 8-bit components
bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmiHeader.biSizeImage = width * height * 4;
// create our DIB section and select the bitmap into the dc
hbitmap = CreateDIBSection(hdc, &bmi, DIB_RGB_COLORS, &pvBits, null, 0x0);
SelectObject(hdc, hbitmap);
auto area = Geometry(width, height, 0, 0);
enum channels = "BGRA"; // win32 uses BGR(A)
byte[] arr = (cast(byte*)pvBits)[0 .. (area.width * area.height) * channels.length];
image.exportPixels(area, arr, channels);
//TODO: Rezize image.
BitBlt(hdcwnd, 0, 0, width, height, hdc, 0, 0, SRCCOPY);
DeleteObject(hbitmap);
DeleteDC(hdc);
}
}
pragma(lib, "gdi32.lib");
const AC_SRC_OVER = 0x00;
const AC_SRC_ALPHA = 0x01;
const GWLP_USERDATA = -21;
enum DWORD BI_RGB = 0;
enum UINT DIB_RGB_COLORS = 0;
struct BLENDFUNCTION
{
BYTE BlendOp;
BYTE BlendFlags;
BYTE SourceConstantAlpha;
BYTE AlphaFormat;
}
struct AlphaBlendType
{
static normal = BLENDFUNCTION(AC_SRC_OVER, 0, 255, AC_SRC_ALPHA);
}
extern(Windows) BOOL BitBlt(HDC, int, int, int, int, HDC, int, int, DWORD);
extern(Windows) HBITMAP CreateCompatibleBitmap(HDC, int, int);
extern(Windows) HBITMAP CreateDIBSection(HDC, const(BITMAPINFO)*, UINT, void**, HANDLE, DWORD);
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