draw.c

   1 /*
   2  * draw.c - draw functions
   3  *
   4  * Copyright © 2007-2008 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 "util.h"
  27 #include "config.h"
  28
  29 extern AwesomeConf globalconf;
  30
  31 /** Get a draw context
  32  * \param phys_screen physical screen id
  33  * \param width width
  34  * \param height height
  35  * \return draw context ref
  36  */
  37 DrawCtx *
  38 draw_get_context(int phys_screen, int width, int height)
  39 {
  40     DrawCtx *d = p_new(DrawCtx, 1);
  41
  42     d->phys_screen = phys_screen;
  43     d->width = width;
  44     d->height = height;
  45     d->depth = DefaultDepth(globalconf.display, phys_screen);
  46     d->visual = DefaultVisual(globalconf.display, phys_screen);
  47     d->drawable = XCreatePixmap(globalconf.display,
  48                                 RootWindow(globalconf.display, phys_screen),
  49                                 width, height, d->depth);
  50
  51     return d;
  52 };
  53
  54 /** Free a draw context and its drawable
  55  * \param ctx the draw context to free
  56  */
  57 void
  58 draw_free_context(DrawCtx *ctx)
  59 {
  60     XFreePixmap(globalconf.display, ctx->drawable);
  61     p_delete(&ctx);
  62 }
  63
  64 /** Draw text into a draw context
  65  * \param x x coord
  66  * \param y y coord
  67  * \param w width
  68  * \param h height
  69  * \param align alignment
  70  * \param padding padding to add before drawing the text
  71  * \param font font to use
  72  * \param text text to draw
  73  * \param fg foreground color
  74  * \param bg background color
  75  */
  76 void
  77 draw_text(DrawCtx *ctx,
  78           int x, int y,
  79           int w, int h,
  80           int align,
  81           int padding,
  82           XftFont *font, const char *text,
  83           XColor fg, XColor bg)
  84 {
  85     int nw = 0;
  86     static char buf[256];
  87     size_t len, olen;
  88     cairo_font_face_t *font_face;
  89     cairo_surface_t *surface;
  90     cairo_t *cr;
  91
  92     draw_rectangle(ctx, x, y, w, h, True, bg);
  93
  94     olen = len = a_strlen(text);
  95
  96     if(!len)
  97         return;
  98
  99     surface = cairo_xlib_surface_create(globalconf.display, ctx->drawable, ctx->visual, ctx->width, ctx->height);
 100     cr = cairo_create(surface);
 101     font_face = cairo_ft_font_face_create_for_pattern(font->pattern);
 102     cairo_set_font_face(cr, font_face);
 103     cairo_set_font_size(cr, font->height);
 104     cairo_set_source_rgb(cr, fg.red / 65535.0, fg.green / 65535.0, fg.blue / 65535.0);
 105
 106     if(len >= sizeof(buf))
 107         len = sizeof(buf) - 1;
 108     memcpy(buf, text, len);
 109     buf[len] = 0;
 110     while(len && (nw = (draw_textwidth(font, buf)) + padding * 2) > w)
 111         buf[--len] = 0;
 112     if(nw > w)
 113         return;                 /* too long */
 114     if(len < olen)
 115     {
 116         if(len > 1)
 117             buf[len - 1] = '.';
 118         if(len > 2)
 119             buf[len - 2] = '.';
 120         if(len > 3)
 121             buf[len - 3] = '.';
 122     }
 123
 124     switch(align)
 125     {
 126       case AlignLeft:
 127         cairo_move_to(cr, x + padding, y + font->ascent + (ctx->height - font->height) / 2);
 128         break;
 129       case AlignRight:
 130         cairo_move_to(cr, x + (w - nw) + padding, y + font->ascent + (ctx->height - font->height) / 2);
 131         break;
 132       default:
 133         cairo_move_to(cr, x + ((w - nw) / 2) + padding, y + font->ascent + (ctx->height - font->height) / 2);
 134         break;
 135     }
 136     cairo_show_text(cr, buf);
 137
 138     cairo_font_face_destroy(font_face);
 139     cairo_destroy(cr);
 140     cairo_surface_destroy(surface);
 141 }
 142
 143 void
 144 draw_rectangle(DrawCtx *ctx, int x, int y, int w, int h, Bool filled, XColor color)
 145 {
 146     cairo_surface_t *surface;
 147     cairo_t *cr;
 148
 149     surface = cairo_xlib_surface_create(globalconf.display, ctx->drawable, ctx->visual, ctx->width, ctx->height);
 150     cr = cairo_create (surface);
 151
 152     cairo_set_antialias(cr, CAIRO_ANTIALIAS_NONE);
 153     cairo_set_line_width(cr, 1.0);
 154     cairo_set_source_rgb(cr, color.red / 65535.0, color.green / 65535.0, color.blue / 65535.0);
 155     if(filled)
 156     {
 157         cairo_rectangle(cr, x, y, w, h);
 158         cairo_fill(cr);
 159     }
 160     else
 161         cairo_rectangle(cr, x + 1, y, w - 1, h - 1);
 162
 163     cairo_stroke(cr);
 164
 165     cairo_destroy(cr);
 166     cairo_surface_destroy(surface);
 167 }
 168
 169 /* draws a graph; it takes the line-lengths from 'h' (w = size of h)
 170  * It cycles backwards through it, beginning at position h_index, until
 171  * h_index is reached again (wrapped around). */
 172
 173 void
 174 draw_graph(DrawCtx *ctx, int x, int y, int w, int *h, int h_index, XColor color)
 175 {
 176     cairo_surface_t *surface;
 177     cairo_t *cr;
 178     int i;
 179
 180     surface = cairo_xlib_surface_create(globalconf.display, ctx->drawable, ctx->visual, ctx->width, ctx->height);
 181     cr = cairo_create (surface);
 182
 183     cairo_set_antialias(cr, CAIRO_ANTIALIAS_NONE);
 184     cairo_set_line_width(cr, 1.0);
 185     cairo_set_source_rgb(cr, color.red / 65535.0, color.green / 65535.0, color.blue / 65535.0);
 186
 187     i = -1;
 188     while(++i < w)
 189     {
 190         cairo_move_to(cr, x, y);
 191         cairo_line_to(cr, x, y - h[h_index]);
 192         x++;
 193
 194         if (--h_index < 0)
 195             h_index = w - 1;
 196     }
 197
 198     cairo_stroke(cr);
 199
 200     cairo_destroy(cr);
 201     cairo_surface_destroy(surface);
 202 }
 203
 204 void
 205 draw_circle(DrawCtx *ctx, int x, int y, int r, Bool filled, XColor color)
 206 {
 207     cairo_surface_t *surface;
 208     cairo_t *cr;
 209
 210     surface = cairo_xlib_surface_create(globalconf.display, ctx->drawable, ctx->visual, ctx->width, ctx->height);
 211     cr = cairo_create (surface);
 212     cairo_set_line_width(cr, 1.0);
 213     cairo_set_source_rgb(cr, color.red / 65535.0, color.green / 65535.0, color.blue / 65535.0);
 214     if(filled)
 215     {
 216         cairo_arc (cr, x + r, y + r, r, 0, 2 * M_PI);
 217         cairo_fill(cr);
 218     }
 219     else
 220         cairo_arc (cr, x + r, y + r, r - 1, 0, 2 * M_PI);
 221
 222     cairo_stroke(cr);
 223
 224     cairo_destroy(cr);
 225     cairo_surface_destroy(surface);
 226 }
 227
 228 void draw_image_from_argb_data(DrawCtx *ctx, int x, int y, int w, int h,
 229                                int wanted_h, unsigned char *data)
 230 {
 231     double ratio;
 232     cairo_surface_t *surface, *source;
 233     cairo_t *cr;
 234
 235     surface = cairo_xlib_surface_create(globalconf.display, ctx->drawable, ctx->visual, ctx->width, ctx->height);
 236     source = cairo_image_surface_create_for_data(data, CAIRO_FORMAT_ARGB32, w, h, 0);
 237     cr = cairo_create (surface);
 238     if(wanted_h > 0 && h > 0)
 239     {
 240         ratio = (double) wanted_h / (double) h;
 241         cairo_scale(cr, ratio, ratio);
 242         cairo_set_source_surface(cr, source, x / ratio, y / ratio);
 243     }
 244     else
 245         cairo_set_source_surface(cr, source, x, y);
 246     cairo_paint(cr);
 247
 248     cairo_destroy(cr);
 249     cairo_surface_destroy(source);
 250     cairo_surface_destroy(surface);
 251 }
 252
 253 void
 254 draw_image(DrawCtx *ctx, int x, int y, int wanted_h, const char *filename)
 255 {
 256     double ratio;
 257     int h;
 258     cairo_surface_t *surface, *source;
 259     cairo_t *cr;
 260
 261     source = cairo_xlib_surface_create(globalconf.display, ctx->drawable, ctx->visual, ctx->width, ctx->height);
 262     surface = cairo_image_surface_create_from_png(filename);
 263     cr = cairo_create (source);
 264     if(wanted_h > 0 && (h = cairo_image_surface_get_height(surface)) > 0)
 265     {
 266         ratio = (double) wanted_h / (double) h;
 267         cairo_scale(cr, ratio, ratio);
 268         cairo_set_source_surface(cr, surface, x / ratio, y / ratio);
 269     }
 270     else
 271         cairo_set_source_surface(cr, surface, x, y);
 272     cairo_paint(cr);
 273
 274     cairo_destroy(cr);
 275     cairo_surface_destroy(source);
 276     cairo_surface_destroy(surface);
 277
 278
 279 }
 280
 281 Area
 282 draw_get_image_size(const char *filename)
 283 {
 284     Area size;
 285     cairo_surface_t *surface;
 286
 287     surface = cairo_image_surface_create_from_png(filename);
 288     cairo_image_surface_get_width(surface);
 289     size.x = 0;
 290     size.y = 0;
 291     size.width = cairo_image_surface_get_width(surface);
 292     size.height = cairo_image_surface_get_height(surface);
 293     cairo_surface_destroy(surface);
 294
 295     return size;
 296 }
 297
 298 Drawable
 299 draw_rotate(DrawCtx *ctx, int screen, double angle, int tx, int ty)
 300 {
 301     cairo_surface_t *surface, *source;
 302     cairo_t *cr;
 303     Drawable newdrawable;
 304
 305     newdrawable = XCreatePixmap(globalconf.display,
 306                                 RootWindow(globalconf.display, screen),
 307                                 ctx->height, ctx->width,
 308                                 ctx->depth);
 309     surface = cairo_xlib_surface_create(globalconf.display, newdrawable, ctx->visual, ctx->height, ctx->width);
 310     source = cairo_xlib_surface_create(globalconf.display, ctx->drawable, ctx->visual, ctx->width, ctx->height);
 311     cr = cairo_create (surface);
 312
 313     cairo_translate(cr, tx, ty);
 314     cairo_rotate(cr, angle);
 315
 316     cairo_set_source_surface(cr, source, 0.0, 0.0);
 317     cairo_paint(cr);
 318
 319     cairo_destroy(cr);
 320     cairo_surface_destroy(source);
 321     cairo_surface_destroy(surface);
 322
 323     return newdrawable;
 324 }
 325
 326 unsigned short
 327 draw_textwidth(XftFont *font, char *text)
 328 {
 329     cairo_surface_t *surface;
 330     cairo_t *cr;
 331     cairo_font_face_t *font_face;
 332     cairo_text_extents_t te;
 333
 334     if (!a_strlen(text))
 335         return 0;
 336
 337     surface = cairo_xlib_surface_create(globalconf.display, DefaultScreen(globalconf.display),
 338                                         DefaultVisual(globalconf.display, DefaultScreen(globalconf.display)),
 339                                         DisplayWidth(globalconf.display, DefaultScreen(globalconf.display)),
 340                                         DisplayHeight(globalconf.display, DefaultScreen(globalconf.display)));
 341     cr = cairo_create(surface);
 342     font_face = cairo_ft_font_face_create_for_pattern(font->pattern);
 343     cairo_set_font_face(cr, font_face);
 344     cairo_set_font_size(cr, font->height);
 345     cairo_text_extents(cr, text, &te);
 346     cairo_destroy(cr);
 347     cairo_surface_destroy(surface);
 348     cairo_font_face_destroy(font_face);
 349
 350     return MAX(te.x_advance, te.width);
 351 }
 352
 353 Alignment
 354 draw_get_align(const char *align)
 355 {
 356     if(!a_strncmp(align, "center", 6))
 357         return AlignCenter;
 358     else if(!a_strncmp(align, "right", 5))
 359         return AlignRight;
 360
 361     return AlignLeft;
 362 }
 363
 364 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80