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     AlignTop    = (1 << 2),
  52     AlignBottom = (1 << 3),
  53     AlignFlex   = (1 << 4),
  54 } alignment_t;
  55
  56 typedef struct vector_t vector_t;
  57 struct vector_t
  58 {
  59     /** Co-ords of starting point */
  60     int16_t x;
  61     int16_t y;
  62     /** Offset to starting point */
  63     int16_t x_offset;
  64     int16_t y_offset;
  65 };
  66
  67 typedef struct area_t area_t;
  68 struct area_t
  69 {
  70     /** Co-ords of upper left corner */
  71     int16_t  x;
  72     int16_t  y;
  73     uint16_t width;
  74     uint16_t height;
  75 };
  76
  77 DO_ARRAY(area_t, area, DO_NOTHING)
  78
  79 #define AREA_LEFT(a)    ((a).x)
  80 #define AREA_TOP(a)     ((a).y)
  81 #define AREA_RIGHT(a)   ((a).x + (a).width)
  82 #define AREA_BOTTOM(a)    ((a).y + (a).height)
  83
  84 typedef struct
  85 {
  86     PangoFontDescription *desc;
  87     int height;
  88 } font_t;
  89
  90 typedef struct
  91 {
  92     xcb_pixmap_t pixmap;
  93     xcb_visualtype_t *visual;
  94     uint16_t width;
  95     uint16_t height;
  96     int phys_screen;
  97     uint8_t depth;
  98     cairo_t *cr;
  99     cairo_surface_t *surface;
 100     PangoLayout *layout;
 101     xcolor_t fg;
 102     xcolor_t bg;
 103 } draw_context_t;
 104
 105 void draw_context_init(draw_context_t *, int, int, int,
 106                        xcb_pixmap_t, const xcolor_t *, const xcolor_t *);
 107
 108 /** Wipe a draw context.
 109  * \param ctx The draw_context_t to wipe.
 110  */
 111 static inline void
 112 draw_context_wipe(draw_context_t *ctx)
 113 {
 114     if(ctx->layout)
 115     {
 116         g_object_unref(ctx->layout);
 117         ctx->layout = NULL;
 118     }
 119     if(ctx->surface)
 120     {
 121         cairo_surface_destroy(ctx->surface);
 122         ctx->surface = NULL;
 123     }
 124     if(ctx->cr)
 125     {
 126         cairo_destroy(ctx->cr);
 127         ctx->cr = NULL;
 128     }
 129 }
 130
 131 font_t *draw_font_new(const char *);
 132 void draw_font_delete(font_t **);
 133
 134 char * draw_iso2utf8(const char *, size_t);
 135
 136 static inline bool
 137 a_iso2utf8(char **dest, const char *str, ssize_t len)
 138 {
 139     char *utf8;
 140     if((utf8 = draw_iso2utf8(str, len)))
 141     {
 142         *dest = utf8;
 143         return true;
 144     }
 145     *dest = a_strdup(str);
 146     return false;
 147 }
 148
 149 typedef struct
 150 {
 151     PangoAttrList *attr_list;
 152     char *text;
 153     ssize_t len;
 154     alignment_t align;
 155     struct
 156     {
 157         int left, right, top;
 158     } margin;
 159     struct
 160     {
 161         int top, left;
 162     } bg_margin;
 163     bool has_bg_color;
 164     xcolor_t bg_color;
 165     image_t *bg_image;
 166     alignment_t bg_align;
 167     bool bg_resize;
 168     struct
 169     {
 170         int offset;
 171         xcolor_t color;
 172     } shadow;
 173     struct
 174     {
 175         int width;
 176         xcolor_t color;
 177     } border;
 178 } draw_parser_data_t;
 179
 180 bool draw_text_markup_expand(draw_parser_data_t *, const char *, ssize_t);
 181
 182 void draw_text(draw_context_t *, font_t *, area_t, const char *, ssize_t len, draw_parser_data_t *);
 183 void draw_rectangle(draw_context_t *, area_t, float, bool, const xcolor_t *);
 184 void draw_rectangle_gradient(draw_context_t *, area_t, float, bool, vector_t,
 185                              const xcolor_t *, const xcolor_t *, const xcolor_t *);
 186
 187 void draw_graph_setup(draw_context_t *);
 188 void draw_graph(draw_context_t *, area_t, int *, int *, int, position_t, vector_t,
 189                 const xcolor_t *, const xcolor_t *, const xcolor_t *);
 190 void draw_graph_line(draw_context_t *, area_t, int *, int, position_t, vector_t,
 191                      const xcolor_t *, const xcolor_t *, const xcolor_t *);
 192 void draw_image(draw_context_t *, int, int, int, image_t *);
 193 void draw_rotate(draw_context_t *, xcb_drawable_t, xcb_drawable_t, int, int, int, int, double, int, int);
 194 area_t draw_text_extents(font_t *, const char *, ssize_t, draw_parser_data_t *);
 195 alignment_t draw_align_fromstr(const char *, ssize_t);
 196 const char *draw_align_tostr(alignment_t);
 197
 198 typedef struct
 199 {
 200     union
 201     {
 202         xcb_alloc_color_cookie_t cookie_hexa;
 203         xcb_alloc_named_color_cookie_t cookie_named;
 204     };
 205
 206     uint16_t alpha;
 207     xcolor_t *color;
 208     bool is_hexa, has_error;
 209     const char *colstr;
 210 } xcolor_init_request_t;
 211
 212 xcolor_init_request_t xcolor_init_unchecked(xcolor_t *, const char *, ssize_t);
 213 bool xcolor_init_reply(xcolor_init_request_t);
 214
 215 static inline void
 216 draw_parser_data_init(draw_parser_data_t *pdata)
 217 {
 218     p_clear(pdata, 1);
 219 }
 220
 221 static inline void
 222 draw_parser_data_wipe(draw_parser_data_t *pdata)
 223 {
 224     if(pdata)
 225     {
 226         pango_attr_list_unref(pdata->attr_list);
 227         p_delete(&pdata->text);
 228         image_unref(&pdata->bg_image);
 229     }
 230 }
 231
 232 #endif
 233 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80