draw.c

   1 /*
   2  * draw.c - draw functions
   3  *
   4  * Copyright © 2007 Julien Danjou <julien@danjou.info>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  */
  21
  22 #include <cairo.h>
  23 #include <cairo-ft.h>
  24 #include <cairo-xlib.h>
  25 #include <math.h>
  26 #include "layout.h"
  27 #include "util.h"
  28 #include "draw.h"
  29
  30 void
  31 drawtext(Display *disp, int screen, int x, int y, int w, int h, Drawable drawable, int dw, int dh, XftFont *font, const char *text, XColor color[ColLast])
  32 {
  33     int nw = 0;
  34     static char buf[256];
  35     size_t len, olen;
  36     cairo_font_face_t *font_face;
  37     cairo_surface_t *surface;
  38     cairo_t *cr;
  39
  40     drawrectangle(disp, screen, x, y, w, h, drawable, dw, dh, True, color[ColBG]);
  41     if(!a_strlen(text))
  42         return;
  43
  44     surface = cairo_xlib_surface_create(disp, drawable, DefaultVisual(disp, screen), dw, dh);
  45     cr = cairo_create(surface);
  46     font_face = cairo_ft_font_face_create_for_pattern(font->pattern);
  47     cairo_set_font_face(cr, font_face);
  48     cairo_set_font_size(cr, font->height);
  49     cairo_set_source_rgb(cr, color[ColFG].red / 65535.0, color[ColFG].green / 65535.0, color[ColFG].blue / 65535.0);
  50
  51     olen = len = a_strlen(text);
  52     if(len >= sizeof(buf))
  53         len = sizeof(buf) - 1;
  54     memcpy(buf, text, len);
  55     buf[len] = 0;
  56     while(len && (nw = textwidth(disp, font, buf)) > w)
  57         buf[--len] = 0;
  58     if(nw > w)
  59         return;                 /* too long */
  60     if(len < olen)
  61     {
  62         if(len > 1)
  63             buf[len - 1] = '.';
  64         if(len > 2)
  65             buf[len - 2] = '.';
  66         if(len > 3)
  67             buf[len - 3] = '.';
  68     }
  69
  70     cairo_move_to(cr, x + font->height / 2, y + font->ascent + (dh - font->height) / 2);
  71     cairo_show_text(cr, buf);
  72
  73     cairo_font_face_destroy(font_face);
  74     cairo_destroy(cr);
  75     cairo_surface_destroy(surface);
  76 }
  77
  78 void
  79 drawrectangle(Display *disp, int screen, int x, int y, int w, int h, Drawable drawable, int dw, int dh, Bool filled, XColor color)
  80 {
  81     cairo_surface_t *surface;
  82     cairo_t *cr;
  83
  84     surface = cairo_xlib_surface_create(disp, drawable, DefaultVisual(disp, screen), dw, dh);
  85     cr = cairo_create (surface);
  86
  87     cairo_set_antialias(cr, CAIRO_ANTIALIAS_NONE);
  88     cairo_set_line_width(cr, 1.0);
  89     cairo_set_source_rgb(cr, color.red / 65535.0, color.green / 65535.0, color.blue / 65535.0);
  90     if(filled)
  91     {
  92         cairo_rectangle(cr, x, y, w + 1, h + 1);
  93         cairo_fill(cr);
  94     }
  95     else
  96         cairo_rectangle(cr, x + 1, y, w, h);
  97
  98     cairo_stroke(cr);
  99
 100     cairo_destroy(cr);
 101     cairo_surface_destroy(surface);
 102 }
 103
 104 void
 105 drawcircle(Display *disp, int screen, int x, int y, int r, Drawable drawable, int dw, int dh, Bool filled, XColor color)
 106 {
 107     cairo_surface_t *surface;
 108     cairo_t *cr;
 109
 110     surface = cairo_xlib_surface_create(disp, drawable, DefaultVisual(disp, screen), dw, dh);
 111     cr = cairo_create (surface);
 112     cairo_set_line_width(cr, 1.0);
 113     cairo_set_source_rgb(cr, color.red / 65535.0, color.green / 65535.0, color.blue / 65535.0);
 114     if(filled)
 115     {
 116         cairo_arc (cr, x + r, y + r, r, 0, 2 * M_PI);
 117         cairo_fill(cr);
 118     }
 119     else
 120         cairo_arc (cr, x + r, y + r, r - 1, 0, 2 * M_PI);
 121
 122     cairo_stroke(cr);
 123
 124     cairo_destroy(cr);
 125     cairo_surface_destroy(surface);
 126 }
 127
 128 Drawable
 129 draw_rotate(Display *disp, int screen, Drawable drawable, int dw, int dh, double angle, int tx, int ty)
 130 {
 131     cairo_surface_t *surface, *source;
 132     cairo_t *cr;
 133     Drawable newdrawable;
 134
 135     newdrawable = XCreatePixmap(disp,
 136                                 RootWindow(disp, screen),
 137                                 dh, dw,
 138                                 DefaultDepth(disp, screen));
 139     surface = cairo_xlib_surface_create(disp, newdrawable, DefaultVisual(disp, screen), dh, dw);
 140     source = cairo_xlib_surface_create(disp, drawable, DefaultVisual(disp, screen), dw, dh);
 141     cr = cairo_create (surface);
 142
 143     cairo_translate(cr, tx, ty);
 144     cairo_rotate(cr, angle);
 145
 146     cairo_set_source_surface(cr, source, 0.0, 0.0);
 147     cairo_paint(cr);
 148
 149     cairo_destroy(cr);
 150     cairo_surface_destroy(source);
 151     cairo_surface_destroy(surface);
 152
 153     return newdrawable;
 154 }
 155
 156 unsigned short
 157 textwidth(Display *disp, XftFont *font, char *text)
 158 {
 159     cairo_surface_t *surface;
 160     cairo_t *cr;
 161     cairo_font_face_t *font_face;
 162     cairo_text_extents_t te;
 163
 164     surface = cairo_xlib_surface_create(disp, DefaultScreen(disp),
 165                                         DefaultVisual(disp, DefaultScreen(disp)),
 166                                         DisplayWidth(disp, DefaultScreen(disp)),
 167                                         DisplayHeight(disp, DefaultScreen(disp)));
 168     cr = cairo_create(surface);
 169     font_face = cairo_ft_font_face_create_for_pattern(font->pattern);
 170     cairo_set_font_face(cr, font_face);
 171     cairo_set_font_size(cr, font->height);
 172     cairo_text_extents(cr, text, &te);
 173     cairo_destroy(cr);
 174     cairo_surface_destroy(surface);
 175     cairo_font_face_destroy(font_face);
 176
 177     return MAX(te.x_advance, te.width) + font->height;
 178 }
 179
 180 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99