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     PangoFontDescription *desc;
  73     int height;
  74 } font_t;
  75
  76 typedef struct
  77 {
  78     xcb_pixmap_t pixmap;
  79     uint16_t width;
  80     uint16_t height;
  81     int phys_screen;
  82     cairo_t *cr;
  83     cairo_surface_t *surface;
  84     PangoLayout *layout;
  85     xcolor_t fg;
  86     xcolor_t bg;
  87 } draw_context_t;
  88
  89 void draw_context_init(draw_context_t *, int, int, int,
  90                        xcb_pixmap_t, const xcolor_t *, const xcolor_t *);
  91
  92 /** Wipe a draw context.
  93  * \param ctx The draw_context_t to wipe.
  94  */
  95 static inline void
  96 draw_context_wipe(draw_context_t *ctx)
  97 {
  98     if(ctx->layout)
  99     {
 100         g_object_unref(ctx->layout);
 101         ctx->layout = NULL;
 102     }
 103     if(ctx->surface)
 104     {
 105         cairo_surface_destroy(ctx->surface);
 106         ctx->surface = NULL;
 107     }
 108     if(ctx->cr)
 109     {
 110         cairo_destroy(ctx->cr);
 111         ctx->cr = NULL;
 112     }
 113 }
 114
 115 font_t *draw_font_new(const char *);
 116 void draw_font_delete(font_t **);
 117
 118 bool draw_iso2utf8(const char *, size_t, char **, ssize_t *);
 119
 120 /** Convert a string to UTF-8.
 121  * \param str The string to convert.
 122  * \param len The string length.
 123  * \param dest The destination string that will be allocated.
 124  * \param dlen The destination string length allocated, can be NULL.
 125  * \return True if the conversion happened, false otherwise. In both case, dest
 126  * and dlen will have value and dest have to be free().
 127  */
 128 static inline bool
 129 a_iso2utf8(const char *str, ssize_t len, char **dest, ssize_t *dlen)
 130 {
 131     if(draw_iso2utf8(str, len, dest, dlen))
 132         return true;
 133
 134     *dest = a_strdup(str);
 135     if(dlen)
 136         *dlen = len;
 137
 138     return false;
 139 }
 140
 141 typedef struct
 142 {
 143     PangoAttrList *attr_list;
 144     char *text;
 145     ssize_t len;
 146 } draw_text_context_t;
 147
 148 bool draw_text_context_init(draw_text_context_t *, const char *, ssize_t);
 149 void draw_text(draw_context_t *, draw_text_context_t *, PangoEllipsizeMode, PangoWrapMode, alignment_t, alignment_t, area_t);
 150 void draw_rectangle(draw_context_t *, area_t, float, bool, const color_t *);
 151 void draw_rectangle_gradient(draw_context_t *, area_t, float, bool, vector_t,
 152                              const color_t *, const color_t *, const color_t *);
 153
 154 void draw_graph_setup(draw_context_t *);
 155 void draw_graph(draw_context_t *, area_t, int *, int *, int, position_t, vector_t,
 156                 const color_t *, const color_t *, const color_t *);
 157 void draw_graph_line(draw_context_t *, area_t, int *, int, position_t, vector_t,
 158                      const color_t *, const color_t *, const color_t *);
 159 void draw_image(draw_context_t *, int, int, double, image_t *);
 160 void draw_rotate(draw_context_t *, xcb_drawable_t, xcb_drawable_t, int, int, int, int, double, int, int);
 161 area_t draw_text_extents(draw_text_context_t *);
 162 alignment_t draw_align_fromstr(const char *, ssize_t);
 163 const char *draw_align_tostr(alignment_t);
 164
 165 static inline void
 166 draw_text_context_wipe(draw_text_context_t *pdata)
 167 {
 168     if(pdata)
 169     {
 170         if(pdata->attr_list)
 171             pango_attr_list_unref(pdata->attr_list);
 172         p_delete(&pdata->text);
 173     }
 174 }
 175
 176 #endif
 177 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80