High Level Assembly (HLA) >> Win32 API (HLA v1.x) >> Painting

Set Pixel

---

參考資訊：
1. win32
2. masm32

屏幕的最小顯示單位是像素，像素由紅色(Red)、綠色(Green)、藍色(Blue)、Alpha等四個顏色組成，因此，在呼叫CreateWindow()時，傳入的解析度，如：300x300，代表該視窗(有效區域)的X軸有300個像素，而Y軸則是有300個像素，這個300x300像素的區域是可以用來繪製任何東西，WM_PAINT是處理視窗重新繪畫的事件，繪畫的相關處理都需要在這個事件完成，比較特別的是，Windows視窗將繪圖的許多東西抽象化，最基本的需求是：一個DC(Device Context)和一個BITMAP，DC可以想像成是一個畫台，而BITMAP則是一片畫布(Buffer)，DC有了Buffer就可以畫上任何東西並將其顯示在視窗上

main.hla

program main;
      
#include("w.hhf")
#include("args.hhf")
#include("memory.hhf")
#include("strings.hhf")
      
static
    hWin:        dword;
    hInstance:   dword;
    CommandLine: string;
    defWndProc:  dword;
    
readonly
    szCaption: string:= "main";
     
procedure WndProc(hWnd:dword; uMsg:uns32; wParam:dword; lParam:dword); @stdcall;
var
    x: dword;
    y: dword;
    hdc: dword;
    ps: w.PAINTSTRUCT;

begin WndProc;
    if (uMsg == w.WM_PAINT) then
        w.BeginPaint(hWnd, ps);
        mov(eax, hdc);

        for(mov(0, y); y < 100; inc(y)) do
            for(mov(0, x); x < 100; inc(x)) do
                w.SetPixel(hdc, x, y, $ff);
            endfor;
        endfor;

        w.EndPaint(hWnd, ps);
        xor(eax, eax);
    elseif (uMsg == w.WM_CLOSE) then
        w.DestroyWindow(hWnd);
        xor(eax, eax);
    elseif (uMsg == w.WM_DESTROY) then
        w.PostQuitMessage(0);
        xor(eax, eax);
    else
        w.CallWindowProc(defWndProc, hWnd, uMsg, wParam, lParam);
    endif;
end WndProc;
     
procedure WinMain(hInst:dword; hPrevInst:dword; CmdLine:string; CmdShow:dword);
var
    msg: w.MSG;
      
begin WinMain;
    w.CreateWindowEx(w.WS_EX_LEFT, w.WC_DIALOG, szCaption,
        w.WS_OVERLAPPEDWINDOW | w.WS_VISIBLE, 0, 0, 300, 300, 0, 0, NULL, NULL);
    mov(eax, hWin);
     
    w.SetWindowLong(hWin, w.GWL_WNDPROC, &WndProc);
    mov(eax, defWndProc);

    forever
        w.GetMessage(msg, NULL, 0, 0);
        breakif(!eax);
      
        w.DispatchMessage(msg);
    endfor;
    mov(msg.wParam, eax);
end WinMain;
      
begin main;
    w.GetModuleHandle(NULL);
    mov(eax, hInstance);
    mov(arg.cmdLn(), CommandLine);
     
    WinMain(hInstance, NULL, CommandLine, w.SW_SHOWNORMAL);
     
    w.ExitProcess(eax);
end main;

Line 25~36：處理繪畫事件
Line 26~27：取得視窗的DC，該DC已經有Buffer可以使用，因此，可以直接在上面繪製任何東西
Line 29~33：透過SetPixel()畫出一個正方形，顏色是紅色
Line 35：結束繪製

Makefile

export WINEPREFIX=/home/user/.wine_amd64

TARGET=main
MYWINE=box86 wine

all:
	${MYWINE} hlaparse.exe -WIN32 -level=high -v -test ${TARGET}.hla
	${MYWINE} polink.exe @${TARGET}.link hlalib.lib ${TARGET}.obj /OUT:${TARGET}.exe

run:
	${MYWINE} ${TARGET}.exe

clean:
	rm -rf ${TARGET}.exe ${TARGET}.obj ${TARGET}.link

編譯、執行

$ make
$ make run

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