draw.h

   1 /*
   2  * draw.h - draw functions header
   3  *
   4  * Copyright © 2007-2009 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 #ifndef AWESOME_COMMON_DRAW_H
  23 #define AWESOME_COMMON_DRAW_H
  24
  25 #include <cairo.h>
  26 #include <pango/pangocairo.h>
  27
  28 #include <xcb/xcb.h>
  29
  30 #include "image.h"
  31 #include "color.h"
  32 #include "common/array.h"
  33
  34 typedef enum
  35 {
  36     AlignLeft   = (0),
  37     AlignRight  = (1),
  38     AlignCenter = (1 << 1),
  39     AlignTop    = (1 << 2),
  40     AlignBottom = (1 << 3),
  41     AlignMiddle = (1 << 5)
  42 } alignment_t;
  43
  44 typedef struct vector_t vector_t;
  45 struct vector_t
  46 {
  47     /** Co-ords of starting point */
  48     int16_t x;
  49     int16_t y;
  50     /** Offset to starting point */
  51     int16_t x_offset;
  52     int16_t y_offset;
  53 };
  54
  55 typedef struct area_t area_t;
  56 struct area_t
  57 {
  58     /** Co-ords of upper left corner */
  59     int16_t  x;
  60     int16_t  y;
  61     uint16_t width;
  62     uint16_t height;
  63 };
  64
  65 #define AREA_LEFT(a)    ((a).x)
  66 #define AREA_TOP(a)     ((a).y)
  67 #define AREA_RIGHT(a)   ((a).x + (a).width)
  68 #define AREA_BOTTOM(a)    ((a).y + (a).height)
  69
  70 typedef struct
  71 {
  72     xcb_pixmap_t pixmap;
  73     uint16_t width;
  74     uint16_t height;
  75     int phys_screen;
  76     cairo_t *cr;
  77     cairo_surface_t *surface;
  78     PangoLayout *layout;
  79     xcolor_t fg;
  80     xcolor_t bg;
  81 } draw_context_t;
  82
  83 void draw_context_init(draw_context_t *, int, int, int,
  84                        xcb_pixmap_t, const xcolor_t *, const xcolor_t *);
  85
  86 /** Wipe a draw context.
  87  * \param ctx The draw_context_t to wipe.
  88  */
  89 static inline void
  90 draw_context_wipe(draw_context_t *ctx)
  91 {
  92     if(ctx->layout)
  93     {
  94         g_object_unref(ctx->layout);
  95         ctx->layout = NULL;
  96     }
  97     if(ctx->surface)
  98     {
  99         cairo_surface_destroy(ctx->surface);
 100         ctx->surface = NULL;
 101     }
 102     if(ctx->cr)
 103     {
 104         cairo_destroy(ctx->cr);
 105         ctx->cr = NULL;
 106     }
 107 }
 108
 109 bool draw_iso2utf8(const char *, size_t, char **, ssize_t *);
 110
 111 /** Convert a string to UTF-8.
 112  * \param str The string to convert.
 113  * \param len The string length.
 114  * \param dest The destination string that will be allocated.
 115  * \param dlen The destination string length allocated, can be NULL.
 116  * \return True if the conversion happened, false otherwise. In both case, dest
 117  * and dlen will have value and dest have to be free().
 118  */
 119 static inline bool
 120 a_iso2utf8(const char *str, ssize_t len, char **dest, ssize_t *dlen)
 121 {
 122     if(draw_iso2utf8(str, len, dest, dlen))
 123         return true;
 124
 125     *dest = a_strdup(str);
 126     if(dlen)
 127         *dlen = len;
 128
 129     return false;
 130 }
 131
 132 typedef struct
 133 {
 134     PangoAttrList *attr_list;
 135     char *text;
 136     ssize_t len;
 137 } draw_text_context_t;
 138
 139 bool draw_text_context_init(draw_text_context_t *, const char *, ssize_t);
 140 void draw_text(draw_context_t *, draw_text_context_t *, PangoEllipsizeMode, PangoWrapMode, alignment_t, alignment_t, area_t);
 141 void draw_rectangle(draw_context_t *, area_t, float, bool, const color_t *);
 142 void draw_rectangle_gradient(draw_context_t *, area_t, float, bool, vector_t,
 143                              const color_t *, const color_t *, const color_t *);
 144
 145 void draw_graph_setup(draw_context_t *);
 146 void draw_graph(draw_context_t *, area_t, int *, int *, int, position_t, vector_t,
 147                 const color_t *, const color_t *, const color_t *);
 148 void draw_graph_line(draw_context_t *, area_t, int *, int, position_t, vector_t,
 149                      const color_t *, const color_t *, const color_t *);
 150 void draw_image(draw_context_t *, int, int, double, image_t *);
 151 void draw_rotate(draw_context_t *, xcb_drawable_t, xcb_drawable_t, int, int, int, int, double, int, int);
 152 area_t draw_text_extents(draw_text_context_t *);
 153 alignment_t draw_align_fromstr(const char *, ssize_t);
 154 const char *draw_align_tostr(alignment_t);
 155
 156 static inline void
 157 draw_text_context_wipe(draw_text_context_t *pdata)
 158 {
 159     if(pdata)
 160     {
 161         if(pdata->attr_list)
 162             pango_attr_list_unref(pdata->attr_list);
 163         p_delete(&pdata->text);
 164         p_clear(pdata, 1);
 165     }
 166 }
 167
 168 #endif
 169 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80