draw.h

   1 /*
   2  * draw.h - draw functions header
   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 #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 "common/array.h"
  32 #include "common/list.h"
  33 #include "common/buffer.h"
  34 #include "common/xutil.h"
  35
  36 typedef struct
  37 {
  38     unsigned initialized : 1;
  39     uint32_t pixel;
  40     uint16_t red;
  41     uint16_t green;
  42     uint16_t blue;
  43     uint16_t alpha;
  44 } xcolor_t;
  45
  46 typedef enum
  47 {
  48     AlignLeft   = (0),
  49     AlignRight  = (1),
  50     AlignCenter = (1 << 1),
  51     AlignFlex   = (1 << 2),
  52 } alignment_t;
  53
  54 typedef struct vector_t vector_t;
  55 struct vector_t
  56 {
  57     /** Co-ords of starting point */
  58     int16_t x;
  59     int16_t y;
  60     /** Offset to starting point */
  61     int16_t x_offset;
  62     int16_t y_offset;
  63 };
  64
  65 typedef struct area_t area_t;
  66 struct area_t
  67 {
  68     /** Co-ords of upper left corner */
  69     int16_t  x;
  70     int16_t  y;
  71     uint16_t width;
  72     uint16_t height;
  73 };
  74
  75 DO_ARRAY(area_t, area, DO_NOTHING)
  76
  77 #define AREA_LEFT(a)    ((a).x)
  78 #define AREA_TOP(a)     ((a).y)
  79 #define AREA_RIGHT(a)   ((a).x + (a).width)
  80 #define AREA_BOTTOM(a)    ((a).y + (a).height)
  81
  82 typedef struct
  83 {
  84     PangoFontDescription *desc;
  85     int height;
  86 } font_t;
  87
  88 typedef struct
  89 {
  90     xcb_pixmap_t pixmap;
  91     xcb_visualtype_t *visual;
  92     uint16_t width;
  93     uint16_t height;
  94     int phys_screen;
  95     uint8_t depth;
  96     cairo_t *cr;
  97     cairo_surface_t *surface;
  98     PangoLayout *layout;
  99     xcolor_t fg;
 100     xcolor_t bg;
 101 } draw_context_t;
 102
 103 void draw_context_init(draw_context_t *, int, int, int,
 104                        xcb_pixmap_t, const xcolor_t *, const xcolor_t *);
 105
 106 /** Wipe a draw context.
 107  * \param ctx The draw_context_t to wipe.
 108  */
 109 static inline void
 110 draw_context_wipe(draw_context_t *ctx)
 111 {
 112     if(ctx->layout)
 113     {
 114         g_object_unref(ctx->layout);
 115         ctx->layout = NULL;
 116     }
 117     if(ctx->surface)
 118     {
 119         cairo_surface_destroy(ctx->surface);
 120         ctx->surface = NULL;
 121     }
 122     if(ctx->cr)
 123     {
 124         cairo_destroy(ctx->cr);
 125         ctx->cr = NULL;
 126     }
 127 }
 128
 129 font_t *draw_font_new(int, const char *);
 130 void draw_font_delete(font_t **);
 131
 132 char * draw_iso2utf8(const char *, size_t);
 133
 134 static inline bool
 135 a_iso2utf8(char **dest, const char *str, ssize_t len)
 136 {
 137     char *utf8;
 138     if((utf8 = draw_iso2utf8(str, len)))
 139     {
 140         *dest = utf8;
 141         return true;
 142     }
 143     *dest = a_strdup(str);
 144     return false;
 145 }
 146
 147 typedef struct
 148 {
 149     PangoAttrList *attr_list;
 150     char *text;
 151     ssize_t len;
 152     alignment_t align;
 153     struct
 154     {
 155         int left, right, top;
 156     } margin;
 157     struct
 158     {
 159         int top, left;
 160     } bg_margin;
 161     bool has_bg_color;
 162     xcolor_t bg_color;
 163     image_t *bg_image;
 164     alignment_t bg_align;
 165     bool bg_resize;
 166     struct
 167     {
 168         int offset;
 169         xcolor_t color;
 170     } shadow;
 171     struct
 172     {
 173         int width;
 174         xcolor_t color;
 175     } border;
 176 } draw_parser_data_t;
 177
 178 bool draw_text_markup_expand(draw_parser_data_t *, const char *, ssize_t);
 179
 180 void draw_text(draw_context_t *, font_t *, area_t, const char *, ssize_t len, draw_parser_data_t *);
 181 void draw_rectangle(draw_context_t *, area_t, float, bool, const xcolor_t *);
 182 void draw_rectangle_gradient(draw_context_t *, area_t, float, bool, vector_t,
 183                              const xcolor_t *, const xcolor_t *, const xcolor_t *);
 184
 185 void draw_graph_setup(draw_context_t *);
 186 void draw_graph(draw_context_t *, area_t, int *, int *, int, position_t, vector_t,
 187                 const xcolor_t *, const xcolor_t *, const xcolor_t *);
 188 void draw_graph_line(draw_context_t *, area_t, int *, int, position_t, vector_t,
 189                      const xcolor_t *, const xcolor_t *, const xcolor_t *);
 190 void draw_image(draw_context_t *, int, int, int, image_t *);
 191 void draw_rotate(draw_context_t *, xcb_drawable_t, xcb_drawable_t, int, int, int, int, double, int, int);
 192 area_t draw_text_extents(int, font_t *, const char *, ssize_t, draw_parser_data_t *);
 193 alignment_t draw_align_fromstr(const char *, ssize_t);
 194 const char *draw_align_tostr(alignment_t);
 195
 196 typedef struct
 197 {
 198     union
 199     {
 200         xcb_alloc_color_cookie_t cookie_hexa;
 201         xcb_alloc_named_color_cookie_t cookie_named;
 202     };
 203
 204     uint16_t alpha;
 205     xcolor_t *color;
 206     bool is_hexa, has_error;
 207     const char *colstr;
 208 } xcolor_init_request_t;
 209
 210 xcolor_init_request_t xcolor_init_unchecked(xcolor_t *, const char *, ssize_t);
 211 bool xcolor_init_reply(xcolor_init_request_t);
 212
 213 static inline void
 214 draw_parser_data_init(draw_parser_data_t *pdata)
 215 {
 216     p_clear(pdata, 1);
 217 }
 218
 219 static inline void
 220 draw_parser_data_wipe(draw_parser_data_t *pdata)
 221 {
 222     if(pdata)
 223     {
 224         pango_attr_list_unref(pdata->attr_list);
 225         p_delete(&pdata->text);
 226         image_unref(&pdata->bg_image);
 227     }
 228 }
 229
 230 #endif
 231 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80