New glXUseRotatedXFontMESA() function. Like glXUseXFont(), but takes
a rotation parameter (either 0, 90, 180 or 270 degrees). Also, a demo program.
This commit is contained in:
Brian Paul
parent
eaaf618bb8
commit
b4b35bcc42
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@ -24,7 +24,8 @@ PROGS = glthreads \
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pbdemo \
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wincopy \
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xdemo \
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xfont
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xfont \
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xrotfontdemo
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@ -54,6 +55,16 @@ pbutil.o: pbutil.c pbutil.h
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$(CC) -c -I. -I$(INCDIR) $(CFLAGS) pbutil.c
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xrotfontdemo: xrotfontdemo.o xuserotfont.o
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$(CC) xrotfontdemo.o xuserotfont.o $(LIBS) -o $@
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xuserotfont.o: xuserotfont.c xuserotfont.h
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$(CC) -c -I. -I$(INCDIR) $(CFLAGS) xuserotfont.c
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xrotfontdemo.o: xrotfontdemo.c xuserotfont.h
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$(CC) -c -I. -I$(INCDIR) $(CFLAGS) xrotfontdemo.c
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##### TARGETS #####
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@ -0,0 +1,220 @@
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/*
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* Mesa 3-D graphics library
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*
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* Copyright (C) 1999 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* Example of using glXUseRotatedXFontMESA().
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* 24 Jan 2004
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* Brian Paul
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*/
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#include <GL/gl.h>
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#include <GL/glx.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "xuserotfont.h"
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static const char *ProgramName = "xfont";
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static const char *FontName = "fixed";
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static GLuint FontBase[4];
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static void redraw( Display *dpy, Window w )
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{
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static const char *text = " Rotated bitmap text";
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int i;
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glClear( GL_COLOR_BUFFER_BIT );
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/* triangle */
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glColor3f( 0.2, 0.2, 1.0 );
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glBegin(GL_TRIANGLES);
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glVertex2f( -0.8, 0.7 );
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glVertex2f( -0.8, -0.7 );
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glVertex2f( 0.8, 0.0 );
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glEnd();
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/* marker */
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glColor3f( 0, 1, 0 );
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glBegin(GL_POINTS);
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glVertex2f(0, 0);
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glEnd();
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/* text */
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glColor3f( 1, 1, 1 );
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for (i = 0; i < 4; i++) {
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glRasterPos2f(0, 0);
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glListBase(FontBase[i]);
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glCallLists(strlen(text), GL_UNSIGNED_BYTE, (GLubyte *) text);
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}
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glXSwapBuffers( dpy, w );
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}
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static void resize( unsigned int width, unsigned int height )
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{
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glViewport( 0, 0, width, height );
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glMatrixMode( GL_PROJECTION );
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glLoadIdentity();
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glOrtho( -1.0, 1.0, -1.0, 1.0, -1.0, 1.0 );
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}
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static void setup_font( Display *dpy )
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{
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XFontStruct *fontInfo;
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Font id;
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unsigned int first, last;
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int i;
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fontInfo = XLoadQueryFont(dpy, FontName);
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if (!fontInfo) {
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printf("Error: font %s not found\n", FontName);
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exit(0);
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}
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id = fontInfo->fid;
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first = fontInfo->min_char_or_byte2;
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last = fontInfo->max_char_or_byte2;
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for (i = 0; i < 4; i++) {
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FontBase[i] = glGenLists((GLuint) last + 1);
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if (!FontBase[i]) {
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printf("Error: unable to allocate display lists\n");
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exit(0);
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}
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glXUseRotatedXFontMESA(id, first, last - first + 1, FontBase[i] + first,
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i * 90);
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}
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}
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static Window make_rgb_db_window( Display *dpy, int xpos, int ypos,
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unsigned int width, unsigned int height )
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{
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int attrib[] = { GLX_RGBA,
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GLX_RED_SIZE, 1,
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GLX_GREEN_SIZE, 1,
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GLX_BLUE_SIZE, 1,
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GLX_DOUBLEBUFFER,
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None };
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int scrnum;
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XSetWindowAttributes attr;
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unsigned long mask;
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Window root;
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Window win;
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GLXContext ctx;
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XVisualInfo *visinfo;
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scrnum = DefaultScreen( dpy );
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root = RootWindow( dpy, scrnum );
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visinfo = glXChooseVisual( dpy, scrnum, attrib );
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if (!visinfo) {
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printf("Error: couldn't get an RGB, Double-buffered visual\n");
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exit(1);
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}
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/* window attributes */
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attr.background_pixel = 0;
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attr.border_pixel = 0;
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attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone);
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attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
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mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
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win = XCreateWindow( dpy, root, 0, 0, width, height,
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0, visinfo->depth, InputOutput,
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visinfo->visual, mask, &attr );
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{
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XSizeHints sizehints;
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sizehints.x = xpos;
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sizehints.y = ypos;
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sizehints.width = width;
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sizehints.height = height;
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sizehints.flags = USSize | USPosition;
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XSetNormalHints(dpy, win, &sizehints);
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XSetStandardProperties(dpy, win, ProgramName, ProgramName,
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None, (char **)NULL, 0, &sizehints);
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}
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ctx = glXCreateContext( dpy, visinfo, NULL, True );
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glXMakeCurrent( dpy, win, ctx );
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return win;
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}
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static void event_loop( Display *dpy )
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{
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XEvent event;
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while (1) {
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XNextEvent( dpy, &event );
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switch (event.type) {
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case Expose:
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redraw( dpy, event.xany.window );
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break;
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case ConfigureNotify:
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resize( event.xconfigure.width, event.xconfigure.height );
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break;
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case KeyPress:
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exit(0);
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default:
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; /* no-op */
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}
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}
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}
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int main( int argc, char *argv[] )
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{
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Display *dpy;
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Window win;
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dpy = XOpenDisplay(NULL);
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win = make_rgb_db_window( dpy, 0, 0, 300, 300 );
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setup_font( dpy );
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glShadeModel( GL_FLAT );
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glClearColor( 0.5, 0.5, 1.0, 1.0 );
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XMapWindow( dpy, win );
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event_loop( dpy );
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return 0;
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}
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@ -0,0 +1,399 @@
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/*
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* Mesa 3-D graphics library
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* Version: 6.0
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*
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* Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/* \file xuserotfont.c
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*
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* A function like glXUseXFont() but takes a 0, 90, 180 or 270 degree
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* rotation angle for rotated text display.
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*
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* Based on Mesa's glXUseXFont implementation written by Thorsten Ohl.
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*/
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <GL/glx.h>
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#include "xuserotfont.h"
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/**
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* Generate OpenGL-compatible bitmap by drawing an X character glyph
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* to an off-screen pixmap, then getting the image and testing pixels.
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* \param width bitmap width in pixels
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* \param height bitmap height in pixels
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*/
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static void
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fill_bitmap(Display *dpy, Pixmap pixmap, GC gc,
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unsigned int bitmapWidth, unsigned int bitmapHeight,
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unsigned int charWidth, unsigned int charHeight,
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int xPos, int yPos, unsigned int c, GLubyte * bitmap,
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int rotation)
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{
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const int bytesPerRow = (bitmapWidth + 7) / 8;
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XImage *image;
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XChar2b char2b;
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/* clear pixmap to 0 */
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XSetForeground(dpy, gc, 0);
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XFillRectangle(dpy, pixmap, gc, 0, 0, charWidth, charHeight);
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/* The glyph is drawn snug up against the left/top edges of the pixmap */
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XSetForeground(dpy, gc, 1);
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char2b.byte1 = (c >> 8) & 0xff;
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char2b.byte2 = (c & 0xff);
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XDrawString16(dpy, pixmap, gc, xPos, yPos, &char2b, 1);
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/* initialize GL bitmap */
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memset(bitmap, 0, bytesPerRow * bitmapHeight);
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image = XGetImage(dpy, pixmap, 0, 0, charWidth, charHeight, 1, XYPixmap);
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if (image) {
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/* Set appropriate bits in the GL bitmap.
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* Note: X11 and OpenGL are upside down wrt each other).
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*/
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unsigned int x, y;
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if (rotation == 0) {
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for (y = 0; y < charHeight; y++) {
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for (x = 0; x < charWidth; x++) {
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if (XGetPixel(image, x, y)) {
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int y2 = bitmapHeight - y - 1;
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bitmap[bytesPerRow * y2 + x / 8] |= (1 << (7 - (x % 8)));
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}
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}
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}
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}
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else if (rotation == 90) {
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for (y = 0; y < charHeight; y++) {
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for (x = 0; x < charWidth; x++) {
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if (XGetPixel(image, x, y)) {
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int x2 = y;
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int y2 = x;
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bitmap[bytesPerRow * y2 + x2 / 8] |= (1 << (7 - (x2 % 8)));
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}
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}
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}
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}
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else if (rotation == 180) {
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for (y = 0; y < charHeight; y++) {
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for (x = 0; x < charWidth; x++) {
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if (XGetPixel(image, x, y)) {
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int x2 = charWidth - x - 1;
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bitmap[bytesPerRow * y + x2 / 8] |= (1 << (7 - (x2 % 8)));
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}
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}
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}
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}
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else {
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assert(rotation == 270);
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for (y = 0; y < charHeight; y++) {
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for (x = 0; x < charWidth; x++) {
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if (XGetPixel(image, x, y)) {
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int x2 = charHeight - y - 1;
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int y2 = charWidth - x - 1;
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bitmap[bytesPerRow * y2 + x2 / 8] |= (1 << (7 - (x2 % 8)));
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}
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}
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}
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}
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XDestroyImage(image);
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}
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}
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/*
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* Determine if a given glyph is valid and return the
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* corresponding XCharStruct.
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*/
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static const XCharStruct *
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isvalid(const XFontStruct * fs, unsigned int which)
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{
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unsigned int rows, pages;
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unsigned int byte1 = 0, byte2 = 0;
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int i, valid = 1;
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rows = fs->max_byte1 - fs->min_byte1 + 1;
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pages = fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1;
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if (rows == 1) {
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/* "linear" fonts */
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if ((fs->min_char_or_byte2 > which) || (fs->max_char_or_byte2 < which))
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valid = 0;
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}
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else {
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/* "matrix" fonts */
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byte2 = which & 0xff;
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byte1 = which >> 8;
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if ((fs->min_char_or_byte2 > byte2) ||
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(fs->max_char_or_byte2 < byte2) ||
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(fs->min_byte1 > byte1) || (fs->max_byte1 < byte1))
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valid = 0;
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}
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if (valid) {
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if (fs->per_char) {
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if (rows == 1) {
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/* "linear" fonts */
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return fs->per_char + (which - fs->min_char_or_byte2);
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}
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else {
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/* "matrix" fonts */
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i = ((byte1 - fs->min_byte1) * pages) +
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(byte2 - fs->min_char_or_byte2);
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return fs->per_char + i;
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}
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}
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else {
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return &fs->min_bounds;
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}
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}
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return NULL;
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}
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void
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glXUseRotatedXFontMESA(Font font, int first, int count, int listbase,
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int rotation)
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{
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Display *dpy;
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Window win;
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Pixmap pixmap;
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GC gc;
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XFontStruct *fs;
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GLint swapbytes, lsbfirst, rowlength;
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GLint skiprows, skippixels, alignment;
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unsigned int maxCharWidth, maxCharHeight;
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GLubyte *bm;
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int i;
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if (rotation != 0 &&
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rotation != 90 &&
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rotation != 180 &&
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rotation != 270)
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return;
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dpy = glXGetCurrentDisplay();
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if (!dpy)
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return; /* I guess glXMakeCurrent wasn't called */
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win = RootWindow(dpy, DefaultScreen(dpy));
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fs = XQueryFont(dpy, font);
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if (!fs) {
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/*
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_mesa_error(NULL, GL_INVALID_VALUE,
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"Couldn't get font structure information");
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*/
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return;
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}
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/* Allocate a GL bitmap that can fit any character */
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maxCharWidth = fs->max_bounds.rbearing - fs->min_bounds.lbearing;
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maxCharHeight = fs->max_bounds.ascent + fs->max_bounds.descent;
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/* use max, in case we're rotating */
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if (rotation == 90 || rotation == 270) {
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/* swap width/height */
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bm = (GLubyte *) malloc((maxCharHeight + 7) / 8 * maxCharWidth);
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}
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else {
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/* normal or upside down */
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bm = (GLubyte *) malloc((maxCharWidth + 7) / 8 * maxCharHeight);
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}
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if (!bm) {
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XFreeFontInfo(NULL, fs, 1);
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/*
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_mesa_error(NULL, GL_OUT_OF_MEMORY,
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"Couldn't allocate bitmap in glXUseXFont()");
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*/
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return;
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}
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#if 0
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/* get the page info */
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pages = fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1;
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firstchar = (fs->min_byte1 << 8) + fs->min_char_or_byte2;
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lastchar = (fs->max_byte1 << 8) + fs->max_char_or_byte2;
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rows = fs->max_byte1 - fs->min_byte1 + 1;
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unsigned int first_char, last_char, pages, rows;
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#endif
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/* Save the current packing mode for bitmaps. */
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glGetIntegerv(GL_UNPACK_SWAP_BYTES, &swapbytes);
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glGetIntegerv(GL_UNPACK_LSB_FIRST, &lsbfirst);
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glGetIntegerv(GL_UNPACK_ROW_LENGTH, &rowlength);
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glGetIntegerv(GL_UNPACK_SKIP_ROWS, &skiprows);
|
||||
glGetIntegerv(GL_UNPACK_SKIP_PIXELS, &skippixels);
|
||||
glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment);
|
||||
|
||||
/* Enforce a standard packing mode which is compatible with
|
||||
fill_bitmap() from above. This is actually the default mode,
|
||||
except for the (non)alignment. */
|
||||
glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
|
||||
glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
|
||||
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
|
||||
glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
|
||||
glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
|
||||
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
|
||||
|
||||
/* Create pixmap and GC */
|
||||
pixmap = XCreatePixmap(dpy, win, maxCharWidth, maxCharHeight, 1);
|
||||
{
|
||||
XGCValues values;
|
||||
unsigned long valuemask;
|
||||
values.foreground = BlackPixel(dpy, DefaultScreen(dpy));
|
||||
values.background = WhitePixel(dpy, DefaultScreen(dpy));
|
||||
values.font = fs->fid;
|
||||
valuemask = GCForeground | GCBackground | GCFont;
|
||||
gc = XCreateGC(dpy, pixmap, valuemask, &values);
|
||||
}
|
||||
|
||||
#ifdef DEBUG_XROT
|
||||
if (debug_xfonts)
|
||||
dump_font_struct(fs);
|
||||
#endif
|
||||
|
||||
for (i = 0; i < count; i++) {
|
||||
const unsigned int c = first + i;
|
||||
const int list = listbase + i;
|
||||
unsigned int charWidth, charHeight;
|
||||
unsigned int bitmapWidth, bitmapHeight;
|
||||
GLfloat xOrig, yOrig, xStep, yStep, dtemp;
|
||||
const XCharStruct *ch;
|
||||
int xPos, yPos;
|
||||
int valid;
|
||||
|
||||
/* check on index validity and get the bounds */
|
||||
ch = isvalid(fs, c);
|
||||
if (!ch) {
|
||||
ch = &fs->max_bounds;
|
||||
valid = 0;
|
||||
}
|
||||
else {
|
||||
valid = 1;
|
||||
}
|
||||
|
||||
#ifdef DEBUG_XROT
|
||||
if (debug_xfonts) {
|
||||
char s[7];
|
||||
sprintf(s, isprint(c) ? "%c> " : "\\%03o> ", c);
|
||||
dump_char_struct(ch, s);
|
||||
}
|
||||
#endif
|
||||
|
||||
/* glBitmap()' parameters:
|
||||
straight from the glXUseXFont(3) manpage. */
|
||||
charWidth = ch->rbearing - ch->lbearing;
|
||||
charHeight = ch->ascent + ch->descent;
|
||||
xOrig = -ch->lbearing;
|
||||
yOrig = ch->descent;
|
||||
xStep = ch->width;
|
||||
yStep = 0;
|
||||
|
||||
/* X11's starting point. */
|
||||
xPos = -ch->lbearing;
|
||||
yPos = ch->ascent;
|
||||
|
||||
/* Apply rotation */
|
||||
switch (rotation) {
|
||||
case 0:
|
||||
/* nothing */
|
||||
bitmapWidth = charWidth;
|
||||
bitmapHeight = charHeight;
|
||||
break;
|
||||
case 90:
|
||||
/* xStep, yStep */
|
||||
dtemp = xStep;
|
||||
xStep = -yStep;
|
||||
yStep = dtemp;
|
||||
/* xOrig, yOrig */
|
||||
yOrig = xOrig;
|
||||
xOrig = charHeight - (charHeight - yPos);
|
||||
/* width, height */
|
||||
bitmapWidth = charHeight;
|
||||
bitmapHeight = charWidth;
|
||||
break;
|
||||
case 180:
|
||||
/* xStep, yStep */
|
||||
xStep = -xStep;
|
||||
yStep = -yStep;
|
||||
/* xOrig, yOrig */
|
||||
xOrig = charWidth - xOrig - 1;
|
||||
yOrig = charHeight - yOrig - 1;
|
||||
bitmapWidth = charWidth;
|
||||
bitmapHeight = charHeight;
|
||||
break;
|
||||
case 270:
|
||||
/* xStep, yStep */
|
||||
dtemp = xStep;
|
||||
xStep = yStep;
|
||||
yStep = -dtemp;
|
||||
/* xOrig, yOrig */
|
||||
dtemp = yOrig;
|
||||
yOrig = charWidth - xOrig;
|
||||
xOrig = dtemp;
|
||||
/* width, height */
|
||||
bitmapWidth = charHeight;
|
||||
bitmapHeight = charWidth;
|
||||
break;
|
||||
default:
|
||||
/* should never get here */
|
||||
;
|
||||
}
|
||||
|
||||
glNewList(list, GL_COMPILE);
|
||||
if (valid && bitmapWidth > 0 && bitmapHeight > 0) {
|
||||
|
||||
fill_bitmap(dpy, pixmap, gc, bitmapWidth, bitmapHeight,
|
||||
charWidth, charHeight,
|
||||
xPos, yPos, c, bm, rotation);
|
||||
|
||||
glBitmap(bitmapWidth, bitmapHeight, xOrig, yOrig, xStep, yStep, bm);
|
||||
|
||||
#ifdef DEBUG_XROT
|
||||
if (debug_xfonts) {
|
||||
printf("width/height = %u/%u\n", bitmapWidth, bitmapHeight);
|
||||
dump_bitmap(bitmapWidth, bitmapHeight, bm);
|
||||
}
|
||||
#endif
|
||||
}
|
||||
else {
|
||||
glBitmap(0, 0, 0.0, 0.0, xStep, yStep, NULL);
|
||||
}
|
||||
glEndList();
|
||||
}
|
||||
|
||||
free(bm);
|
||||
XFreeFontInfo(NULL, fs, 1);
|
||||
XFreePixmap(dpy, pixmap);
|
||||
XFreeGC(dpy, gc);
|
||||
|
||||
/* Restore saved packing modes. */
|
||||
glPixelStorei(GL_UNPACK_SWAP_BYTES, swapbytes);
|
||||
glPixelStorei(GL_UNPACK_LSB_FIRST, lsbfirst);
|
||||
glPixelStorei(GL_UNPACK_ROW_LENGTH, rowlength);
|
||||
glPixelStorei(GL_UNPACK_SKIP_ROWS, skiprows);
|
||||
glPixelStorei(GL_UNPACK_SKIP_PIXELS, skippixels);
|
||||
glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -0,0 +1,12 @@
|
|||
#ifndef XUSEROTFONT_H
|
||||
#define XUSEROTFONT_H
|
||||
|
||||
#include <X11/Xlib.h>
|
||||
|
||||
|
||||
extern void
|
||||
glXUseRotatedXFontMESA(Font font, int first, int count, int listbase,
|
||||
int rotation);
|
||||
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue