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POWinAPI - GDI: DrawText() and ExtTextOut() ugly (AA enabled)
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  1. POWinAPI - GDI: DrawText() and ExtTextOut() ugly (AA enabled)
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    copied!<p>Im trying to make line numbering for a rich edit control using the method described <a href="http://groups.google.com/group/borland.public.cppbuilder.vcl.components.using/tree/browse_frm/thread/e1c1093aabd7b345/640a45bd65903e29?rnum=1&amp;_done=/group/borland.public.cppbuilder.vcl.components.using/browse_frm/thread/e1c1093aabd7b345/640a45bd65903e29?pli=1&amp;#doc_2a5c8e53253996e1" rel="nofollow">here</a> (not MFC though). While it works fine, the rendering of line numbers is really ugly compared to the rich edit.</p> <p>I made a small program to reproduce the problem: (sorry that I copy paste but couldnt find a normal file hosting service -.-):</p> <pre><code>#include &lt;Windows.h&gt; LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) { switch( msg ) { case WM_CLOSE: ShowWindow(hWnd, SW_HIDE); DestroyWindow(hWnd); break; case WM_PAINT: { HDC hdc = GetDC(hWnd); HDC bdc = CreateCompatibleDC(hdc); HBITMAP bitmap = CreateCompatibleBitmap(hdc, 400, 100); int height = -MulDiv(10, GetDeviceCaps(hdc, LOGPIXELSY), 72); HFONT font = CreateFont( height, 0, 0, 0, FW_DONTCARE, FALSE, FALSE, FALSE, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, ANTIALIASED_QUALITY, FF_DONTCARE, "Consolas"); HGDIOBJ oldbm = SelectObject(bdc, bitmap); HGDIOBJ oldft = SelectObject(bdc, font); RECT rc = { 0, 0, 200, 20 }; FillRect(bdc, &amp;rc, (HBRUSH)GetStockObject(WHITE_BRUSH)); DrawText(bdc, " 1 2 3 4 5 6 7 8 9", 19, &amp;rc, DT_LEFT|DT_EDITCONTROL); BitBlt(hdc, 20, 20, rc.right - rc.left, rc.bottom - rc.top, bdc, 0, 0, SRCCOPY); SelectObject(bdc, oldbm); SelectObject(bdc, oldft); DeleteObject(bitmap); DeleteObject(font); DeleteDC(bdc); } return 1; case WM_DESTROY: PostQuitMessage(0); return 0; case WM_KEYUP: switch(wParam) { case VK_ESCAPE: SendMessage(hWnd, WM_CLOSE, 0, 0); break; } break; default: break; } return DefWindowProc(hWnd, msg, wParam, lParam); } INT WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR lpCmdLine, int nShowCmd) { HWND hwnd = 0; WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, (WNDPROC)WndProc, 0L, 0L, hInst, NULL, NULL, NULL, NULL, "TestClass", NULL }; RegisterClassEx(&amp;wc); int w = GetSystemMetrics(0); int h = GetSystemMetrics(1); DWORD style = WS_CLIPCHILDREN|WS_CLIPSIBLINGS|WS_SYSMENU|WS_BORDER|WS_CAPTION; hwnd = CreateWindowA("TestClass", "Winapi1", style, (w - 400) / 2, (h - 200) / 2, 400, 200, NULL, NULL, wc.hInstance, NULL); if( !hwnd ) { MessageBoxA(NULL, "Could not create window!", "Error!", MB_OK); goto _end; } ShowWindow(hwnd, SW_SHOWDEFAULT); UpdateWindow(hwnd); MSG msg; ZeroMemory(&amp;msg, sizeof(msg)); while( msg.message != WM_QUIT ) { while( PeekMessage(&amp;msg, NULL, 0U, 0U, PM_REMOVE) ) { TranslateMessage(&amp;msg); DispatchMessage(&amp;msg); } } _end: UnregisterClass("TestClass", wc.hInstance); return 0; } </code></pre> <p>A comparison of the result with typing the text into a rich edit:</p> <p><em>(...can't post image -.- ...)</em></p> <p>While the difference is 'subtle' if I enlarge the image it shows that rich edit uses some kind of coloring.</p> <p>I tried the following things:</p> <ul> <li>using ExTextOut</li> <li>saving the bitmap to file to see if its ugly too (it is)</li> <li>drawing directly into hdc (also ugly plus it flickers but thats not an issue right now)</li> </ul> <p>What am I missing?</p>
 

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