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libcaca/caca/driver_x11.c

562 lignes
18 KiB
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  1. /*

  2.  *  libcaca       Colour ASCII-Art library

  3.  *  Copyright (c) 2002-2006 Sam Hocevar <sam@zoy.org>

  4.  *                All Rights Reserved

  5.  *

  6.  *  This library is free software; you can redistribute it and/or

  7.  *  modify it under the terms of the Do What The Fuck You Want To

  8.  *  Public License, Version 2, as published by Sam Hocevar. See

  9.  *  http://sam.zoy.org/wtfpl/COPYING for more details.

  10.  */

  11. 

  12. /** \file driver_x11.c

  13.  *  \version \$Id$

  14.  *  \author Sam Hocevar <sam@zoy.org>

  15.  *  \brief X11 driver

  16.  *

  17.  *  This file contains the libcaca X11 input and output driver

  18.  */

  19. 

  20. #include "config.h"

  21. 

  22. #if defined(USE_X11)

  23. 

  24. #include <X11/Xlib.h>

  25. #include <X11/Xutil.h>

  26. #include <X11/keysym.h>

  27. #if defined(HAVE_X11_XKBLIB_H)

  28. #   include <X11/XKBlib.h>

  29. #endif

  30. 

  31. #include <stdio.h> /* BUFSIZ */

  32. #include <stdlib.h>

  33. 

  34. #include "caca.h"

  35. #include "caca_internals.h"

  36. #include "cucul.h"

  37. #include "cucul_internals.h"

  38. 

  39. /*

  40.  * Local functions

  41.  */

  42. static int x11_error_handler(Display *, XErrorEvent *);

  43. 

  44. struct driver_private

  45. {

  46.     Display *dpy;

  47.     Window window;

  48.     Pixmap pixmap;

  49.     GC gc;

  50.     long int event_mask;

  51.     int font_width, font_height;

  52.     int colors[16];

  53.     Font font;

  54.     XFontStruct *font_struct;

  55.     int font_offset;

  56. #if defined(HAVE_X11_XKBLIB_H)

  57.     Bool autorepeat;

  58. #endif

  59. };

  60. 

  61. static int x11_init_graphics(caca_t *kk)

  62. {

  63.     static int const x11_palette[] =

  64.     {

  65.         /* Standard curses colours */

  66.         0x0,    0x0,    0x0,

  67.         0x0,    0x0,    0x8000,

  68.         0x0,    0x8000, 0x0,

  69.         0x0,    0x8000, 0x8000,

  70.         0x8000, 0x0,    0x0,

  71.         0x8000, 0x0,    0x8000,

  72.         0x8000, 0x8000, 0x0,

  73.         0x8000, 0x8000, 0x8000,

  74.         /* Extra values for xterm-16color */

  75.         0x4000, 0x4000, 0x4000,

  76.         0x4000, 0x4000, 0xffff,

  77.         0x4000, 0xffff, 0x4000,

  78.         0x4000, 0xffff, 0xffff,

  79.         0xffff, 0x4000, 0x4000,

  80.         0xffff, 0x4000, 0xffff,

  81.         0xffff, 0xffff, 0x4000,

  82.         0xffff, 0xffff, 0xffff,

  83.     };

  84. 

  85.     Colormap colormap;

  86.     XSetWindowAttributes x11_winattr;

  87.     int (*old_error_handler)(Display *, XErrorEvent *);

  88.     char const *fonts[] = { NULL, "8x13bold", "fixed" }, **parser;

  89.     char const *geometry;

  90.     unsigned int width = 0, height = 0;

  91.     int i;

  92. 

  93.     kk->drv.p = malloc(sizeof(struct driver_private));

  94. 

  95.     geometry = getenv("CACA_GEOMETRY");

  96.     if(geometry && *geometry)

  97.         sscanf(geometry, "%ux%u", &width, &height);

  98. 

  99.     if(width && height)

  100.         _cucul_set_size(kk->qq, width, height);

  101. 

  102.     kk->drv.p->dpy = XOpenDisplay(NULL);

  103.     if(kk->drv.p->dpy == NULL)

  104.         return -1;

  105. 

  106.     fonts[0] = getenv("CACA_FONT");

  107.     if(fonts[0] && *fonts[0])

  108.         parser = fonts;

  109.     else

  110.         parser = fonts + 1;

  111. 

  112.     /* Ignore font errors */

  113.     old_error_handler = XSetErrorHandler(x11_error_handler);

  114. 

  115.     /* Parse our font list */

  116.     for( ; ; parser++)

  117.     {

  118.         if(!*parser)

  119.         {

  120.             XSetErrorHandler(old_error_handler);

  121.             XCloseDisplay(kk->drv.p->dpy);

  122.             return -1;

  123.         }

  124. 

  125.         kk->drv.p->font = XLoadFont(kk->drv.p->dpy, *parser);

  126.         if(!kk->drv.p->font)

  127.             continue;

  128. 

  129.         kk->drv.p->font_struct = XQueryFont(kk->drv.p->dpy, kk->drv.p->font);

  130.         if(!kk->drv.p->font_struct)

  131.         {

  132.             XUnloadFont(kk->drv.p->dpy, kk->drv.p->font);

  133.             continue;

  134.         }

  135. 

  136.         break;

  137.     }

  138. 

  139.     /* Reset the default X11 error handler */

  140.     XSetErrorHandler(old_error_handler);

  141. 

  142.     kk->drv.p->font_width = kk->drv.p->font_struct->max_bounds.width;

  143.     kk->drv.p->font_height = kk->drv.p->font_struct->max_bounds.ascent

  144.                          + kk->drv.p->font_struct->max_bounds.descent;

  145.     kk->drv.p->font_offset = kk->drv.p->font_struct->max_bounds.descent;

  146. 

  147.     colormap = DefaultColormap(kk->drv.p->dpy, DefaultScreen(kk->drv.p->dpy));

  148.     for(i = 0; i < 16; i++)

  149.     {

  150.         XColor color;

  151.         color.red = x11_palette[i * 3];

  152.         color.green = x11_palette[i * 3 + 1];

  153.         color.blue = x11_palette[i * 3 + 2];

  154.         XAllocColor(kk->drv.p->dpy, colormap, &color);

  155.         kk->drv.p->colors[i] = color.pixel;

  156.     }

  157. 

  158.     x11_winattr.backing_store = Always;

  159.     x11_winattr.background_pixel = kk->drv.p->colors[0];

  160.     x11_winattr.event_mask = ExposureMask | StructureNotifyMask;

  161. 

  162.     kk->drv.p->window =

  163.         XCreateWindow(kk->drv.p->dpy, DefaultRootWindow(kk->drv.p->dpy), 0, 0,

  164.                       kk->qq->width * kk->drv.p->font_width,

  165.                       kk->qq->height * kk->drv.p->font_height,

  166.                       0, 0, InputOutput, 0,

  167.                       CWBackingStore | CWBackPixel | CWEventMask,

  168.                       &x11_winattr);

  169. 

  170.     XStoreName(kk->drv.p->dpy, kk->drv.p->window, "caca for X");

  171. 

  172.     XSelectInput(kk->drv.p->dpy, kk->drv.p->window, StructureNotifyMask);

  173.     XMapWindow(kk->drv.p->dpy, kk->drv.p->window);

  174. 

  175.     kk->drv.p->gc = XCreateGC(kk->drv.p->dpy, kk->drv.p->window, 0, NULL);

  176.     XSetForeground(kk->drv.p->dpy, kk->drv.p->gc, kk->drv.p->colors[15]);

  177.     XSetFont(kk->drv.p->dpy, kk->drv.p->gc, kk->drv.p->font);

  178. 

  179.     for(;;)

  180.     {

  181.         XEvent xevent;

  182.         XNextEvent(kk->drv.p->dpy, &xevent);

  183.         if (xevent.type == MapNotify)

  184.             break;

  185.     }

  186. 

  187. #if defined(HAVE_X11_XKBLIB_H)

  188.     /* Disable autorepeat */

  189.     XkbSetDetectableAutoRepeat(kk->drv.p->dpy, True, &kk->drv.p->autorepeat);

  190.     if(!kk->drv.p->autorepeat)

  191.         XAutoRepeatOff(kk->drv.p->dpy);

  192. #endif

  193. 

  194.     kk->drv.p->event_mask = KeyPressMask | KeyReleaseMask | ButtonPressMask

  195.           | ButtonReleaseMask | PointerMotionMask | StructureNotifyMask

  196.           | ExposureMask;

  197. 

  198.     XSelectInput(kk->drv.p->dpy, kk->drv.p->window, kk->drv.p->event_mask);

  199. 

  200.     XSync(kk->drv.p->dpy, False);

  201. 

  202.     kk->drv.p->pixmap = XCreatePixmap(kk->drv.p->dpy, kk->drv.p->window,

  203.                                    kk->qq->width * kk->drv.p->font_width,

  204.                                    kk->qq->height * kk->drv.p->font_height,

  205.                                    DefaultDepth(kk->drv.p->dpy,

  206.                                             DefaultScreen(kk->drv.p->dpy)));

  207. 

  208.     return 0;

  209. }

  210. 

  211. static int x11_end_graphics(caca_t *kk)

  212. {

  213.     XSync(kk->drv.p->dpy, False);

  214. #if defined(HAVE_X11_XKBLIB_H)

  215.     if(!kk->drv.p->autorepeat)

  216.         XAutoRepeatOn(kk->drv.p->dpy);

  217. #endif

  218.     XFreePixmap(kk->drv.p->dpy, kk->drv.p->pixmap);

  219.     XFreeFont(kk->drv.p->dpy, kk->drv.p->font_struct);

  220.     XFreeGC(kk->drv.p->dpy, kk->drv.p->gc);

  221.     XUnmapWindow(kk->drv.p->dpy, kk->drv.p->window);

  222.     XDestroyWindow(kk->drv.p->dpy, kk->drv.p->window);

  223.     XCloseDisplay(kk->drv.p->dpy);

  224. 

  225.     free(kk->drv.p);

  226. 

  227.     return 0;

  228. }

  229. 

  230. static int x11_set_window_title(caca_t *kk, char const *title)

  231. {

  232.     XStoreName(kk->drv.p->dpy, kk->drv.p->window, title);

  233.     return 0;

  234. }

  235. 

  236. static unsigned int x11_get_window_width(caca_t *kk)

  237. {

  238.     return kk->qq->width * kk->drv.p->font_width;

  239. }

  240. 

  241. static unsigned int x11_get_window_height(caca_t *kk)

  242. {

  243.     return kk->qq->height * kk->drv.p->font_height;

  244. }

  245. 

  246. static void x11_display(caca_t *kk)

  247. {

  248.     unsigned int x, y, len;

  249. 

  250.     /* First draw the background colours. Splitting the process in two

  251.      * loops like this is actually slightly faster. */

  252.     for(y = 0; y < kk->qq->height; y++)

  253.     {

  254.         for(x = 0; x < kk->qq->width; x += len)

  255.         {

  256.             uint8_t *attr = kk->qq->attr + x + y * kk->qq->width;

  257. 

  258.             len = 1;

  259.             while(x + len < kk->qq->width

  260.                    && (attr[len] >> 4) == (attr[0] >> 4))

  261.                 len++;

  262. 

  263.             XSetForeground(kk->drv.p->dpy, kk->drv.p->gc,

  264.                            kk->drv.p->colors[attr[0] >> 4]);

  265.             XFillRectangle(kk->drv.p->dpy, kk->drv.p->pixmap, kk->drv.p->gc,

  266.                            x * kk->drv.p->font_width, y * kk->drv.p->font_height,

  267.                            len * kk->drv.p->font_width, kk->drv.p->font_height);

  268.         }

  269.     }

  270. 

  271.     /* Then print the foreground characters */

  272.     for(y = 0; y < kk->qq->height; y++)

  273.     {

  274.         unsigned int yoff = (y + 1) * kk->drv.p->font_height

  275.                                     - kk->drv.p->font_offset;

  276.         uint32_t *chars = kk->qq->chars + y * kk->qq->width;

  277. 

  278.         for(x = 0; x < kk->qq->width; x++, chars++)

  279.         {

  280.             uint8_t *attr = kk->qq->attr + x + y * kk->qq->width;

  281. 

  282.             /* Skip spaces */

  283.             if(*chars == 0x00000020)

  284.                 continue;

  285. 

  286.             XSetForeground(kk->drv.p->dpy, kk->drv.p->gc,

  287.                            kk->drv.p->colors[*attr & 0xf]);

  288. 

  289.             /* Plain ASCII, no problem. */

  290.             if(*chars > 0x00000020 && *chars < 0x00000080)

  291.             {

  292.                 char c = (uint8_t)*chars;

  293.                 XDrawString(kk->drv.p->dpy, kk->drv.p->pixmap, kk->drv.p->gc,

  294.                             x * kk->drv.p->font_width, yoff, &c, 1);

  295.                 continue;

  296.             }

  297. 

  298.             /* We want to be able to print a few special Unicode characters

  299.              * such as the CP437 gradients and half blocks. For unknown

  300.              * characters, just print '?'. */

  301.             switch(*chars)

  302.             {

  303.                 case 0x00002580: /* ▀ */

  304.                     XFillRectangle(kk->drv.p->dpy, kk->drv.p->pixmap,

  305.                                    kk->drv.p->gc,

  306.                                    x * kk->drv.p->font_width,

  307.                                    y * kk->drv.p->font_height,

  308.                                    kk->drv.p->font_width,

  309.                                    kk->drv.p->font_height / 2);

  310.                     break;

  311.                 case 0x00002584: /* ▄ */

  312.                     XFillRectangle(kk->drv.p->dpy, kk->drv.p->pixmap,

  313.                                    kk->drv.p->gc,

  314.                                    x * kk->drv.p->font_width,

  315.                                    (y + 1) * kk->drv.p->font_height

  316.                                            - kk->drv.p->font_height / 2,

  317.                                    kk->drv.p->font_width,

  318.                                    kk->drv.p->font_height / 2);

  319.                     break;

  320.                 case 0x00002588: /* █ */

  321.                     XFillRectangle(kk->drv.p->dpy, kk->drv.p->pixmap,

  322.                                    kk->drv.p->gc,

  323.                                    x * kk->drv.p->font_width,

  324.                                    y * kk->drv.p->font_height,

  325.                                    kk->drv.p->font_width,

  326.                                    kk->drv.p->font_height);

  327.                     break;

  328.                 case 0x0000258c: /* ▌ */

  329.                     XFillRectangle(kk->drv.p->dpy, kk->drv.p->pixmap,

  330.                                    kk->drv.p->gc,

  331.                                    x * kk->drv.p->font_width,

  332.                                    y * kk->drv.p->font_height,

  333.                                    kk->drv.p->font_width / 2,

  334.                                    kk->drv.p->font_height);

  335.                     break;

  336.                 case 0x00002590: /* ▐ */

  337.                     XFillRectangle(kk->drv.p->dpy, kk->drv.p->pixmap,

  338.                                    kk->drv.p->gc,

  339.                                    (x + 1) * kk->drv.p->font_width

  340.                                            - kk->drv.p->font_width / 2,

  341.                                    y * kk->drv.p->font_height,

  342.                                    kk->drv.p->font_width / 2,

  343.                                    kk->drv.p->font_height);

  344.                     break;

  345.                 case 0x00002593: /* ▓ */

  346.                 case 0x00002592: /* ▒ */

  347.                 case 0x00002591: /* ░ */

  348.                 {

  349.                     /* FIXME: this sucks utterly */

  350.                     int i, j, k = *chars - 0x00002591;

  351.                     for(j = kk->drv.p->font_height; j--; )

  352.                         for(i = kk->drv.p->font_width; i--; )

  353.                     {

  354.                         if(((i + 2 * (j & 1)) & 3) > k)

  355.                             continue;

  356. 

  357.                         XDrawPoint(kk->drv.p->dpy, kk->drv.p->pixmap,

  358.                                    kk->drv.p->gc,

  359.                                    x * kk->drv.p->font_width + i,

  360.                                    y * kk->drv.p->font_height + j);

  361.                     }

  362.                     break;

  363.                 }

  364.                 default:

  365.                 {

  366.                     char c;

  367.                     c = '?';

  368.                     XDrawString(kk->drv.p->dpy, kk->drv.p->pixmap,

  369.                                 kk->drv.p->gc,

  370.                                 x * kk->drv.p->font_width, yoff, &c, 1);

  371.                     break;

  372.                 }

  373.             }

  374.         }

  375.     }

  376. 

  377.     XCopyArea(kk->drv.p->dpy, kk->drv.p->pixmap, kk->drv.p->window,

  378.               kk->drv.p->gc, 0, 0,

  379.               kk->qq->width * kk->drv.p->font_width,

  380.               kk->qq->height * kk->drv.p->font_height,

  381.               0, 0);

  382.     XFlush(kk->drv.p->dpy);

  383. }

  384. 

  385. static void x11_handle_resize(caca_t *kk)

  386. {

  387.     Pixmap new_pixmap;

  388. 

  389.     new_pixmap = XCreatePixmap(kk->drv.p->dpy, kk->drv.p->window,

  390.                                kk->resize.w * kk->drv.p->font_width,

  391.                                kk->resize.h * kk->drv.p->font_height,

  392.                                DefaultDepth(kk->drv.p->dpy,

  393.                                             DefaultScreen(kk->drv.p->dpy)));

  394.     XCopyArea(kk->drv.p->dpy, kk->drv.p->pixmap, new_pixmap,

  395.               kk->drv.p->gc, 0, 0,

  396.               kk->resize.w * kk->drv.p->font_width,

  397.               kk->resize.h * kk->drv.p->font_height, 0, 0);

  398.     XFreePixmap(kk->drv.p->dpy, kk->drv.p->pixmap);

  399.     kk->drv.p->pixmap = new_pixmap;

  400. }

  401. 

  402. static int x11_get_event(caca_t *kk, struct caca_event *ev)

  403. {

  404.     XEvent xevent;

  405.     char key;

  406. 

  407.     while(XCheckWindowEvent(kk->drv.p->dpy, kk->drv.p->window,

  408.                             kk->drv.p->event_mask, &xevent) == True)

  409.     {

  410.         KeySym keysym;

  411. 

  412.         /* Expose event */

  413.         if(xevent.type == Expose)

  414.         {

  415.             XCopyArea(kk->drv.p->dpy, kk->drv.p->pixmap,

  416.                       kk->drv.p->window, kk->drv.p->gc, 0, 0,

  417.                       kk->qq->width * kk->drv.p->font_width,

  418.                       kk->qq->height * kk->drv.p->font_height, 0, 0);

  419.             continue;

  420.         }

  421. 

  422.         /* Resize event */

  423.         if(xevent.type == ConfigureNotify)

  424.         {

  425.             unsigned int w, h;

  426. 

  427.             w = (xevent.xconfigure.width + kk->drv.p->font_width / 3)

  428.                   / kk->drv.p->font_width;

  429.             h = (xevent.xconfigure.height + kk->drv.p->font_height / 3)

  430.                   / kk->drv.p->font_height;

  431. 

  432.             if(!w || !h || (w == kk->qq->width && h == kk->qq->height))

  433.                 continue;

  434. 

  435.             kk->resize.w = w;

  436.             kk->resize.h = h;

  437.             kk->resize.resized = 1;

  438. 

  439.             continue;

  440.         }

  441. 

  442.         /* Check for mouse motion events */

  443.         if(xevent.type == MotionNotify)

  444.         {

  445.             unsigned int newx = xevent.xmotion.x / kk->drv.p->font_width;

  446.             unsigned int newy = xevent.xmotion.y / kk->drv.p->font_height;

  447. 

  448.             if(newx >= kk->qq->width)

  449.                 newx = kk->qq->width - 1;

  450.             if(newy >= kk->qq->height)

  451.                 newy = kk->qq->height - 1;

  452. 

  453.             if(kk->mouse.x == newx && kk->mouse.y == newy)

  454.                 continue;

  455. 

  456.             kk->mouse.x = newx;

  457.             kk->mouse.y = newy;

  458. 

  459.             ev->type = CACA_EVENT_MOUSE_MOTION;

  460.             ev->data.mouse.x = kk->mouse.x;

  461.             ev->data.mouse.y = kk->mouse.y;

  462.             return 1;

  463.         }

  464. 

  465.         /* Check for mouse press and release events */

  466.         if(xevent.type == ButtonPress)

  467.         {

  468.             ev->type = CACA_EVENT_MOUSE_PRESS;

  469.             ev->data.mouse.button = ((XButtonEvent *)&xevent)->button;

  470.             return 1;

  471.         }

  472. 

  473.         if(xevent.type == ButtonRelease)

  474.         {

  475.             ev->type = CACA_EVENT_MOUSE_RELEASE;

  476.             ev->data.mouse.button = ((XButtonEvent *)&xevent)->button;

  477.             return 1;

  478.         }

  479. 

  480.         /* Check for key press and release events */

  481.         if(xevent.type == KeyPress)

  482.             ev->type = CACA_EVENT_KEY_PRESS;

  483.         else if(xevent.type == KeyRelease)

  484.             ev->type = CACA_EVENT_KEY_RELEASE;

  485.         else

  486.             continue;

  487. 

  488.         if(XLookupString(&xevent.xkey, &key, 1, NULL, NULL))

  489.         {

  490.             ev->data.key.c = key;

  491.             ev->data.key.ucs4 = key;

  492.             ev->data.key.utf8[0] = key;

  493.             ev->data.key.utf8[1] = '\0';

  494.             return 1;

  495.         }

  496. 

  497.         keysym = XKeycodeToKeysym(kk->drv.p->dpy, xevent.xkey.keycode, 0);

  498.         switch(keysym)

  499.         {

  500.             case XK_F1:    ev->data.key.c = CACA_KEY_F1;    break;

  501.             case XK_F2:    ev->data.key.c = CACA_KEY_F2;    break;

  502.             case XK_F3:    ev->data.key.c = CACA_KEY_F3;    break;

  503.             case XK_F4:    ev->data.key.c = CACA_KEY_F4;    break;

  504.             case XK_F5:    ev->data.key.c = CACA_KEY_F5;    break;

  505.             case XK_F6:    ev->data.key.c = CACA_KEY_F6;    break;

  506.             case XK_F7:    ev->data.key.c = CACA_KEY_F7;    break;

  507.             case XK_F8:    ev->data.key.c = CACA_KEY_F8;    break;

  508.             case XK_F9:    ev->data.key.c = CACA_KEY_F9;    break;

  509.             case XK_F10:   ev->data.key.c = CACA_KEY_F10;   break;

  510.             case XK_F11:   ev->data.key.c = CACA_KEY_F11;   break;

  511.             case XK_F12:   ev->data.key.c = CACA_KEY_F12;   break;

  512.             case XK_F13:   ev->data.key.c = CACA_KEY_F13;   break;

  513.             case XK_F14:   ev->data.key.c = CACA_KEY_F14;   break;

  514.             case XK_F15:   ev->data.key.c = CACA_KEY_F15;   break;

  515.             case XK_Left:  ev->data.key.c = CACA_KEY_LEFT;  break;

  516.             case XK_Right: ev->data.key.c = CACA_KEY_RIGHT; break;

  517.             case XK_Up:    ev->data.key.c = CACA_KEY_UP;    break;

  518.             case XK_Down:  ev->data.key.c = CACA_KEY_DOWN;  break;

  519. 

  520.             default: ev->type = CACA_EVENT_NONE; return 0;

  521.         }

  522. 

  523.         ev->data.key.ucs4 = 0;

  524.         ev->data.key.utf8[0] = '\0';

  525.         return 1;

  526.     }

  527. 

  528.     ev->type = CACA_EVENT_NONE;

  529.     return 0;

  530. }

  531. 

  532. /*

  533.  * XXX: following functions are local

  534.  */

  535. 

  536. static int x11_error_handler(Display *dpy, XErrorEvent *xevent)

  537. {

  538.     /* Ignore the error */

  539.     return 0;

  540. }

  541. 

  542. /*

  543.  * Driver initialisation

  544.  */

  545. 

  546. void x11_init_driver(caca_t *kk)

  547. {

  548.     kk->drv.driver = CACA_DRIVER_X11;

  549. 

  550.     kk->drv.init_graphics = x11_init_graphics;

  551.     kk->drv.end_graphics = x11_end_graphics;

  552.     kk->drv.set_window_title = x11_set_window_title;

  553.     kk->drv.get_window_width = x11_get_window_width;

  554.     kk->drv.get_window_height = x11_get_window_height;

  555.     kk->drv.display = x11_display;

  556.     kk->drv.handle_resize = x11_handle_resize;

  557.     kk->drv.get_event = x11_get_event;

  558. }

  559. 

  560. #endif /* USE_X11 */