AGG 成果

AGG 成果

2010-07-11 22:14

作为本文的结尾，这里放上一个用AGG生成不规则文字窗体的代码。它综合了我们之前学到的AGG字体引擎、坐标转换、颜色渐变等几大模 块。由于AGG的抗锯齿特性，使用生 成的窗体看上去边缘过渡非常自然，几乎看不到“毛边”。 先放上最终生成的窗体的效果： 貌似比网页左上角的logo还要好看那么一点点-_- #define _WIN32_WINNT 0x0501 #include <windows.h> #include <agg_array.h> #include <agg_pixfmt_rgba.h> #include <agg_scanline_u.h> #include <agg_renderer_scanline.h> #include <../font_win32_tt/agg_font_win32_tt.h> #include <agg_font_cache_manager.h> #include <agg_span_solid.h> #include <agg_span_interpolator_linear.h> #include <agg_span_gradient.h> #include <agg_span_allocator.h> #include <agg_conv_transform.h> #include <agg_ellipse.h> #include <agg_trans_single_path.h> typedef agg::font_engine_win32_tt_int16 fe_type; typedef agg::font_cache_manager<fe_type> fcman_type; typedef agg::renderer_base<agg::pixfmt_bgra32> renb_type; // 使用指定的顶点源和线段生成器输出文字 template<class VS, class SpanGenerator> void AggDrawText(renb_type &renb, fcman_type &font_manager, VS &vs, SpanGenerator &span_gen, const wchar_t *txt) { using namespace agg; span_allocator<rgba8> span_alloc; rasterizer_scanline_aa<> ras; scanline_u8 sl; double x=0, y=0; for(const wchar_t *p = txt; *p; p++) { const glyph_cache* gc = font_manager.glyph(*p); if(gc) { font_manager.init_embedded_adaptors(gc, x, y); ras.add_path(vs); agg::render_scanlines_aa(ras, sl, renb, span_alloc, span_gen); x += gc->advance_x; y += gc->advance_y; } } } // 向renb的指定位置和半径输出http://www. ,有环绕效果 void DrawUrl(HDC dc, renb_type &renb, double ox, double oy, double rx, double ry) { using namespace agg; //字体引擎 fe_type font(dc); fcman_type font_manager(font); font.height(18.0); font.flip_y(true); font.hinting(true); if(!font.create_font("Comic Sans MS",agg::glyph_ren_outline)) return; //坐标转换管道 typedef conv_curve< fcman_type::path_adaptor_type > cc_pa_type; cc_pa_type ccpath(font_manager.path_adaptor()); typedef conv_transform<cc_pa_type, trans_single_path> ct_cc_pa_type; trans_single_path trans_path; ct_cc_pa_type ctpath(ccpath, trans_path); ellipse ell(0,0,rx,ry); trans_affine ellmtx; conv_transform<ellipse> ctell(ell, ellmtx); ellmtx.rotate(agg::pi); ellmtx.translate(ox,oy); trans_path.add_path(ctell); // 线段生成器 span_solid<rgba8> ss; ss.color(rgba(1,0,0)); AggDrawText(renb, font_manager, ctpath, ss, L"http://www."); } // 向renb的指定位置输出“C++编程”几个字，有镜象效果 void DrawName(HDC dc, renb_type &renb, double x, double y) { using namespace agg; // 字体引擎 fe_type font(dc); fcman_type font_manager(font); font.height(30.0); font.flip_y(true); font.hinting(true); if(!font.create_font("黑体",agg::glyph_ren_outline)) return; // 坐标转换管道 typedef conv_curve< fcman_type::path_adaptor_type > cc_pa_type; cc_pa_type ccpath(font_manager.path_adaptor()); typedef conv_transform<cc_pa_type> ct_cc_pa_type; trans_affine mtx; ct_cc_pa_type ctpath( ccpath, mtx ); mtx.translate(50,50); //线段生成器 span_solid<rgba8> ss; ss.color(rgba(0,0,0)); AggDrawText(renb, font_manager, ctpath, ss, L"C++编程"); // 改变坐标转换矩阵(镜像) mtx.reset(); mtx.flip_y(); mtx.translate(50,60); // 渐变线段生成器 typedef span_interpolator_linear<> interpolator_type; trans_affine img_mtx; interpolator_type ip(img_mtx); typedef gradient_y gradientF_type; gradientF_type grF; typedef gradient_linear_color<rgba8> colorF_type; colorF_type colorF(rgba(0,0,0), rgba(0,0,0,0)); typedef span_gradient<rgba8, interpolator_type, gradientF_type, colorF_type> span_gen_type; span_gen_type span_gen(ip,grF,colorF,30,80); AggDrawText(renb, font_manager, ctpath, span_gen, L"C++编程"); } // 调用DrawUrl和DrawName向renb输出文字 void DrawIt(HDC dc, renb_type &renb) { // 以透明色填充 renb.clear(rgba(0,0,0,0)); // 输出文字 DrawUrl(dc, renb, 100, 50, 80, 40); DrawName(dc, renb, 50, 50); } // 使用AGG处理图片后与hwnd关联 void SetLayoutWin(HWND hwnd) { // 起始位置和窗体大小 POINT ptWinPos = {500,200}; SIZE sizeWindow = {200, 100}; // 建立DIB BITMAPINFO bmp_info; ::ZeroMemory(&bmp_info, sizeof(bmp_info)); bmp_info.bmiHeader.biSize = sizeof(BITMAPINFOHEADER); bmp_info.bmiHeader.biWidth = sizeWindow.cx; bmp_info.bmiHeader.biHeight = sizeWindow.cy; bmp_info.bmiHeader.biPlanes = 1; bmp_info.bmiHeader.biBitCount = 32; bmp_info.bmiHeader.biCompression = BI_RGB; HDC hdcTemp = GetDC(0); HDC mem_dc = ::CreateCompatibleDC(hdcTemp); ReleaseDC(0, hdcTemp); void* buf = NULL; HBITMAP bmp = ::CreateDIBSection( mem_dc, &bmp_info, DIB_RGB_COLORS, &buf, 0, 0 ); // 把bmp与mem_dc关联，这样AGG就可以和原生GDI一起工作了 HBITMAP temp = (HBITMAP)::SelectObject(mem_dc, bmp); { // AGG处理 agg::rendering_buffer rbuf( (unsigned char*)buf, sizeWindow.cx, sizeWindow.cy, -sizeWindow.cx*4); agg::pixfmt_bgra32 pixf(rbuf); renb_type renb(pixf); DrawIt(mem_dc,renb); } // 把画好的mem_dc与hwnd关联到一起 BLENDFUNCTION m_Blend={AC_SRC_OVER,0,255,AC_SRC_ALPHA}; POINT ptSrc = {0, 0}; BOOL bRet = UpdateLayeredWindow(hwnd, 0, &ptWinPos, &sizeWindow, mem_dc, &ptSrc, 0, &m_Blend, ULW_ALPHA); // 回收 ::DeleteObject(bmp); ::DeleteDC(mem_dc); } // Windows消息处理 LRESULT CALLBACK WndProc (HWND hwnd, UINT umsg, WPARAM wParam, LPARAM lParam) { switch (umsg) { case WM_CLOSE: DestroyWindow (hwnd); return 0; case WM_DESTROY: PostQuitMessage (0); return 0; case WM_NCHITTEST: return HTCAPTION; } return DefWindowProc (hwnd, umsg, wParam, lParam); } int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow) { WNDCLASS wc={ 0,WndProc, 0,0, hInstance, NULL,LoadCursor(NULL, IDC_ARROW), (HBRUSH)(COLOR_WINDOW+1), 0,"AGGWIN" }; ::RegisterClass(&wc); HWND hWnd = ::CreateWindowEx(WS_EX_LAYERED,"AGGWIN", NULL, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL); if (!hWnd) return -1; SetLayoutWin(hWnd); ::ShowWindow(hWnd, nCmdShow); // 主消息循环: MSG msg; while (GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return (int) msg.wParam; }