当然国外有POWERVR提供基于OPENGL ES的SDK封装的APPPRINT3D类来处理字符串显示和GLFONT for windows ce等。
但是我们这里只整理了一个函数:
- void glTextShow(WCHAR *fontname, int fontsize, int style, int x, int y, const WCHAR *string)
- {
- int len, xx = 0, yy = 0, nbpoints = 0, i;
- GLshort *points;
- GLushort *indices;
- HFONT font;
- LOGFONTW lf;
- RECT rect;
- static HBITMAP bmp;
- static BYTE *img;
- static HDC hdc = NULL;
- static BITMAPINFO bi;
- SIZE sz;
- static EGLint width, height;
- if(!fontname || !string)
- return;
- if(!string[0])
- return;
- if(!hdc)
- {
- hdc = CreateCompatibleDC(GetDC(hWnd));
- eglQuerySurface(eglDisplay, eglSurface, EGL_WIDTH, &width);
- eglQuerySurface(eglDisplay, eglSurface, EGL_HEIGHT, &height);
- ZeroMemory(&bi, sizeof(BITMAPINFO));
- bi.bmiHeader.biSize=sizeof(BITMAPINFOHEADER);
- bi.bmiHeader.biWidth = width;
- bi.bmiHeader.biHeight = height;
- bi.bmiHeader.biBitCount = 8;
- bi.bmiHeader.biPlanes = 1;
- bi.bmiHeader.biCompression = BI_RGB;
- bmp = CreateDIBSection(hdc, &bi, DIB_RGB_COLORS, &img, NULL, 0);
- SelectObject(hdc, bmp);
- SelectObject(hdc, GetStockObject(BLACK_BRUSH));
- SetBkMode(hdc, TRANSPARENT);
- SetTextColor(hdc, RGB(255, 255, 255));
- }
- Rectangle(hdc, 0, 0, width, height);
- ZeroMemory(img, width * height);
- lf.lfCharSet = DEFAULT_CHARSET;
- lf.lfClipPrecision = CLIP_DEFAULT_PRECIS;
- lf.lfEscapement = 0;
- wcscpy(lf.lfFaceName, fontname);
- lf.lfHeight = -(fontsize * GetDeviceCaps(GetDC(hWnd), LOGPIXELSY) / 72);
- lf.lfItalic = (style & 1) ? TRUE : FALSE;
- lf.lfOrientation = 0;
- lf.lfOutPrecision = OUT_DEFAULT_PRECIS;
- lf.lfPitchAndFamily = DEFAULT_PITCH | FF_DONTCARE;
- lf.lfQuality = DEFAULT_QUALITY;
- lf.lfStrikeOut = FALSE;
- lf.lfUnderline = (style & 4) ? TRUE : FALSE;
- lf.lfWidth = 0;
- lf.lfWeight = (style & 2) ? FW_BOLD : FW_NORMAL;
- font = CreateFontIndirectW(&lf);
- SelectObject(hdc, font);
- len = wcslen(string);
- GetTextExtentPointW(hdc, string, len, &sz);
- rect.left = max(0, min(x, width));
- rect.top = max(0, min(y, height));
- rect.right = min(rect.left + sz.cx, width);
- rect.bottom = min(rect.top + sz.cy, height);
- DrawTextW(hdc, string, len, &rect, DT_LEFT | DT_BOTTOM);
- points = (GLshort*)malloc(sz.cx * sz.cy * 2 * sizeof(short));
- for(yy = rect.top; yy < rect.bottom; yy++)
- {
- for(xx = rect.left; xx < rect.right; xx++)
- {
- if(img[xx + (height - yy) * width] != 0)
- {
- points[nbpoints * 2 + 0] = xx - x;
- points[nbpoints * 2 + 1] = (short)(rect.top + sz.cy - (yy - rect.top)) - y;
- nbpoints++;
- }
- }
- }
- DeleteObject(font);
- indices = (GLushort*)malloc(nbpoints * sizeof(GLushort));
- for(i = 0; i < nbpoints; i++)
- indices[i] = i;
- glMatrixMode(GL_PROJECTION);
- glPushMatrix();
- glLoadIdentity();
- glOrthox(0, _INT2FIXED(width),
- 0, _INT2FIXED(height),
- 0, _INT2FIXED(1));
- glMatrixMode(GL_MODELVIEW);
- glPushMatrix();
- glLoadIdentity();
- glDisable(GL_DEPTH_TEST);
- glTranslatex(_INT2FIXED(x), _INT2FIXED(y), 0);
- glEnable(GL_ALPHA_TEST);
- glAlphaFuncx(GL_NOTEQUAL, 0);
- glDisableClientState(GL_TEXTURE_COORD_ARRAY);
- glDisableClientState(GL_COLOR_ARRAY);
- glDisableClientState(GL_NORMAL_ARRAY);
- glEnableClientState (GL_VERTEX_ARRAY);
- glVertexPointer(2, GL_SHORT, 0, points);
- glDrawElements(GL_POINTS,
- nbpoints,
- GL_UNSIGNED_SHORT,
- indices);
- glDisable(GL_ALPHA_TEST);
- glEnable(GL_DEPTH_TEST);
- glPopMatrix();
- glMatrixMode(GL_PROJECTION);
- glPopMatrix();
- glMatrixMode(GL_MODELVIEW);
- free(indices);
- free(points);
- }
本文转自 yarin 51CTO博客,原文链接:
http://blog.51cto.com/yarin/381955
,如需转载请自行联系原作者