2 * vim:ts=4:sw=4:expandtab
4 * © 2015 Ingo Bürk and contributors (see also: LICENSE)
6 * draw.c: Utility for drawing.
13 #include <xcb/xcb_aux.h>
15 #include <cairo/cairo-xcb.h>
20 xcb_connection_t *xcb_connection;
21 xcb_visualtype_t *visual_type;
23 /* Forward declarations */
24 static void draw_util_set_source_color(surface_t *surface, color_t color);
27 * Initialize the surface to represent the given drawable.
30 void draw_util_surface_init(surface_t *surface, xcb_drawable_t drawable, int width, int height) {
31 surface->id = drawable;
32 surface->width = width;
33 surface->height = height;
35 surface->gc = xcb_generate_id(xcb_connection);
36 xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(xcb_connection, surface->gc, surface->id, 0, NULL);
38 xcb_generic_error_t *error = xcb_request_check(xcb_connection, gc_cookie);
40 ELOG("Could not create graphical context. Error code: %d\n", error->error_code);
45 surface->surface = cairo_xcb_surface_create(xcb_connection, surface->id, visual_type, width, height);
46 surface->cr = cairo_create(surface->surface);
51 * Destroys the surface.
54 void draw_util_surface_free(surface_t *surface) {
55 xcb_free_gc(xcb_connection, surface->gc);
57 cairo_surface_destroy(surface->surface);
58 cairo_destroy(surface->cr);
63 * Parses the given color in hex format to an internal color representation.
64 * Note that the input must begin with a hash sign, e.g., "#3fbc59".
67 color_t draw_util_hex_to_color(const char *color) {
69 {color[1], color[2], '\0'},
70 {color[3], color[4], '\0'},
71 {color[5], color[6], '\0'}};
74 .red = strtol(groups[0], NULL, 16) / 255.0,
75 .green = strtol(groups[1], NULL, 16) / 255.0,
76 .blue = strtol(groups[2], NULL, 16) / 255.0,
77 .colorpixel = get_colorpixel(color)};
81 * Set the given color as the source color on the surface.
84 static void draw_util_set_source_color(surface_t *surface, color_t color) {
86 cairo_set_source_rgb(surface->cr, color.red, color.green, color.blue);
88 uint32_t colorpixel = color.colorpixel;
89 xcb_change_gc(xcb_connection, surface->gc, XCB_GC_FOREGROUND | XCB_GC_BACKGROUND,
90 (uint32_t[]){colorpixel, colorpixel});
95 * Draw the given text using libi3.
96 * This function also marks the surface dirty which is needed if other means of
97 * drawing are used. This will be the case when using XCB to draw text.
100 void draw_util_text(i3String *text, surface_t *surface, color_t fg_color, color_t bg_color, int x, int y, int max_width) {
102 /* Flush any changes before we draw the text as this might use XCB directly. */
103 CAIRO_SURFACE_FLUSH(surface->surface);
106 set_font_colors(surface->gc, fg_color.colorpixel, bg_color.colorpixel);
107 draw_text(text, surface->id, surface->gc, visual_type, x, y, max_width);
110 /* Notify cairo that we (possibly) used another way to draw on the surface. */
111 cairo_surface_mark_dirty(surface->surface);
116 * Draws a filled rectangle.
117 * This function is a convenience wrapper and takes care of flushing the
118 * surface as well as restoring the cairo state.
121 void draw_util_rectangle(surface_t *surface, color_t color, double x, double y, double w, double h) {
123 cairo_save(surface->cr);
125 /* Using the SOURCE operator will copy both color and alpha information directly
126 * onto the surface rather than blending it. This is a bit more efficient and
127 * allows better color control for the user when using opacity. */
128 cairo_set_operator(surface->cr, CAIRO_OPERATOR_SOURCE);
129 draw_util_set_source_color(surface, color);
131 cairo_rectangle(surface->cr, x, y, w, h);
132 cairo_fill(surface->cr);
134 /* Make sure we flush the surface for any text drawing operations that could follow.
135 * Since we support drawing text via XCB, we need this. */
136 CAIRO_SURFACE_FLUSH(surface->surface);
138 cairo_restore(surface->cr);
140 draw_util_set_source_color(surface, color);
142 xcb_rectangle_t rect = {x, y, w, h};
143 xcb_poly_fill_rectangle(xcb_connection, surface->id, surface->gc, 1, &rect);
148 * Clears a surface with the given color.
151 void draw_util_clear_surface(surface_t *surface, color_t color) {
153 cairo_save(surface->cr);
155 /* Using the SOURCE operator will copy both color and alpha information directly
156 * onto the surface rather than blending it. This is a bit more efficient and
157 * allows better color control for the user when using opacity. */
158 cairo_set_operator(surface->cr, CAIRO_OPERATOR_SOURCE);
159 draw_util_set_source_color(surface, color);
161 cairo_paint(surface->cr);
163 /* Make sure we flush the surface for any text drawing operations that could follow.
164 * Since we support drawing text via XCB, we need this. */
165 CAIRO_SURFACE_FLUSH(surface->surface);
167 cairo_restore(surface->cr);
169 draw_util_set_source_color(surface, color);
171 xcb_rectangle_t rect = {0, 0, surface->width, surface->height};
172 xcb_poly_fill_rectangle(xcb_connection, surface->id, surface->gc, 1, &rect);
177 * Copies a surface onto another surface.
180 void draw_util_copy_surface(surface_t *src, surface_t *dest, double src_x, double src_y,
181 double dest_x, double dest_y, double width, double height) {
183 cairo_save(dest->cr);
185 /* Using the SOURCE operator will copy both color and alpha information directly
186 * onto the surface rather than blending it. This is a bit more efficient and
187 * allows better color control for the user when using opacity. */
188 cairo_set_operator(dest->cr, CAIRO_OPERATOR_SOURCE);
189 cairo_set_source_surface(dest->cr, src->surface, dest_x - src_x, dest_y - src_y);
191 cairo_rectangle(dest->cr, dest_x, dest_y, width, height);
192 cairo_fill(dest->cr);
194 /* Make sure we flush the surface for any text drawing operations that could follow.
195 * Since we support drawing text via XCB, we need this. */
196 CAIRO_SURFACE_FLUSH(src->surface);
197 CAIRO_SURFACE_FLUSH(dest->surface);
199 cairo_restore(dest->cr);
201 xcb_copy_area(xcb_connection, src->id, dest->id, dest->gc, (int16_t)src_x, (int16_t)src_y,
202 (int16_t)dest_x, (int16_t)dest_y, (uint16_t)width, (uint16_t)height);