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>
21 xcb_connection_t *xcb_connection;
22 xcb_visualtype_t *visual_type;
24 /* Forward declarations */
25 static void draw_util_set_source_color(surface_t *surface, color_t color);
28 * Initialize the surface to represent the given drawable.
31 void draw_util_surface_init(surface_t *surface, xcb_drawable_t drawable, int width, int height) {
32 surface->id = drawable;
33 surface->width = width;
34 surface->height = height;
36 surface->gc = xcb_generate_id(xcb_connection);
37 xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(xcb_connection, surface->gc, surface->id, 0, NULL);
38 if (xcb_request_failed(gc_cookie, "Could not create graphical context"))
42 surface->surface = cairo_xcb_surface_create(xcb_connection, surface->id, visual_type, width, height);
43 surface->cr = cairo_create(surface->surface);
48 * Destroys the surface.
51 void draw_util_surface_free(surface_t *surface) {
52 xcb_free_gc(xcb_connection, surface->gc);
54 cairo_surface_destroy(surface->surface);
55 cairo_destroy(surface->cr);
60 * Parses the given color in hex format to an internal color representation.
61 * Note that the input must begin with a hash sign, e.g., "#3fbc59".
64 color_t draw_util_hex_to_color(const char *color) {
66 {color[1], color[2], '\0'},
67 {color[3], color[4], '\0'},
68 {color[5], color[6], '\0'}};
71 .red = strtol(groups[0], NULL, 16) / 255.0,
72 .green = strtol(groups[1], NULL, 16) / 255.0,
73 .blue = strtol(groups[2], NULL, 16) / 255.0,
74 .colorpixel = get_colorpixel(color)};
78 * Set the given color as the source color on the surface.
81 static void draw_util_set_source_color(surface_t *surface, color_t color) {
83 cairo_set_source_rgb(surface->cr, color.red, color.green, color.blue);
85 uint32_t colorpixel = color.colorpixel;
86 xcb_change_gc(xcb_connection, surface->gc, XCB_GC_FOREGROUND | XCB_GC_BACKGROUND,
87 (uint32_t[]){colorpixel, colorpixel});
92 * Draw the given text using libi3.
93 * This function also marks the surface dirty which is needed if other means of
94 * drawing are used. This will be the case when using XCB to draw text.
97 void draw_util_text(i3String *text, surface_t *surface, color_t fg_color, color_t bg_color, int x, int y, int max_width) {
99 /* Flush any changes before we draw the text as this might use XCB directly. */
100 CAIRO_SURFACE_FLUSH(surface->surface);
103 set_font_colors(surface->gc, fg_color.colorpixel, bg_color.colorpixel);
104 draw_text(text, surface->id, surface->gc, visual_type, x, y, max_width);
107 /* Notify cairo that we (possibly) used another way to draw on the surface. */
108 cairo_surface_mark_dirty(surface->surface);
113 * Draws a filled rectangle.
114 * This function is a convenience wrapper and takes care of flushing the
115 * surface as well as restoring the cairo state.
118 void draw_util_rectangle(surface_t *surface, color_t color, double x, double y, double w, double h) {
120 cairo_save(surface->cr);
122 /* Using the SOURCE operator will copy both color and alpha information directly
123 * onto the surface rather than blending it. This is a bit more efficient and
124 * allows better color control for the user when using opacity. */
125 cairo_set_operator(surface->cr, CAIRO_OPERATOR_SOURCE);
126 draw_util_set_source_color(surface, color);
128 cairo_rectangle(surface->cr, x, y, w, h);
129 cairo_fill(surface->cr);
131 /* Make sure we flush the surface for any text drawing operations that could follow.
132 * Since we support drawing text via XCB, we need this. */
133 CAIRO_SURFACE_FLUSH(surface->surface);
135 cairo_restore(surface->cr);
137 draw_util_set_source_color(surface, color);
139 xcb_rectangle_t rect = {x, y, w, h};
140 xcb_poly_fill_rectangle(xcb_connection, surface->id, surface->gc, 1, &rect);
145 * Clears a surface with the given color.
148 void draw_util_clear_surface(surface_t *surface, color_t color) {
150 cairo_save(surface->cr);
152 /* Using the SOURCE operator will copy both color and alpha information directly
153 * onto the surface rather than blending it. This is a bit more efficient and
154 * allows better color control for the user when using opacity. */
155 cairo_set_operator(surface->cr, CAIRO_OPERATOR_SOURCE);
156 draw_util_set_source_color(surface, color);
158 cairo_paint(surface->cr);
160 /* Make sure we flush the surface for any text drawing operations that could follow.
161 * Since we support drawing text via XCB, we need this. */
162 CAIRO_SURFACE_FLUSH(surface->surface);
164 cairo_restore(surface->cr);
166 draw_util_set_source_color(surface, color);
168 xcb_rectangle_t rect = {0, 0, surface->width, surface->height};
169 xcb_poly_fill_rectangle(xcb_connection, surface->id, surface->gc, 1, &rect);
174 * Copies a surface onto another surface.
177 void draw_util_copy_surface(surface_t *src, surface_t *dest, double src_x, double src_y,
178 double dest_x, double dest_y, double width, double height) {
180 cairo_save(dest->cr);
182 /* Using the SOURCE operator will copy both color and alpha information directly
183 * onto the surface rather than blending it. This is a bit more efficient and
184 * allows better color control for the user when using opacity. */
185 cairo_set_operator(dest->cr, CAIRO_OPERATOR_SOURCE);
186 cairo_set_source_surface(dest->cr, src->surface, dest_x - src_x, src_y);
188 cairo_rectangle(dest->cr, dest_x, dest_y, width, height);
189 cairo_fill(dest->cr);
191 /* Make sure we flush the surface for any text drawing operations that could follow.
192 * Since we support drawing text via XCB, we need this. */
193 CAIRO_SURFACE_FLUSH(src->surface);
194 CAIRO_SURFACE_FLUSH(dest->surface);
196 cairo_restore(dest->cr);
198 xcb_copy_area(xcb_connection, src->id, dest->id, dest->gc, (int16_t)src_x, (int16_t)src_y,
199 (int16_t)dest_x, (int16_t)dest_y, (uint16_t)width, (uint16_t)height);