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 /* The default visual_type to use if none is specified when creating the surface. Must be defined globally. */
21 xcb_visualtype_t *visual_type;
23 /* Forward declarations */
24 static void draw_util_set_source_color(xcb_connection_t *conn, surface_t *surface, color_t color);
26 #define RETURN_UNLESS_SURFACE_INITIALIZED(surface) \
28 if ((surface)->id == XCB_NONE) { \
29 ELOG("Surface %p is not initialized, skipping drawing.\n", surface); \
35 * Initialize the surface to represent the given drawable.
38 void draw_util_surface_init(xcb_connection_t *conn, surface_t *surface, xcb_drawable_t drawable,
39 xcb_visualtype_t *visual, int width, int height) {
40 surface->id = drawable;
41 surface->visual_type = ((visual == NULL) ? visual_type : visual);
42 surface->width = width;
43 surface->height = height;
45 surface->gc = xcb_generate_id(conn);
46 xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(conn, surface->gc, surface->id, 0, NULL);
48 xcb_generic_error_t *error = xcb_request_check(conn, gc_cookie);
50 ELOG("Could not create graphical context. Error code: %d\n", error->error_code);
55 surface->surface = cairo_xcb_surface_create(conn, surface->id, surface->visual_type, width, height);
56 surface->cr = cairo_create(surface->surface);
61 * Destroys the surface.
64 void draw_util_surface_free(xcb_connection_t *conn, surface_t *surface) {
65 xcb_free_gc(conn, surface->gc);
67 cairo_surface_destroy(surface->surface);
68 cairo_destroy(surface->cr);
73 * Resize the surface to the given size.
76 void draw_util_surface_set_size(surface_t *surface, int width, int height) {
77 surface->width = width;
78 surface->height = height;
80 cairo_xcb_surface_set_size(surface->surface, width, height);
85 * Parses the given color in hex format to an internal color representation.
86 * Note that the input must begin with a hash sign, e.g., "#3fbc59".
89 color_t draw_util_hex_to_color(const char *color) {
91 if (strlen(color) == strlen("#rrggbbaa")) {
95 alpha[0] = alpha[1] = 'F';
99 {color[1], color[2], '\0'},
100 {color[3], color[4], '\0'},
101 {color[5], color[6], '\0'},
102 {alpha[0], alpha[1], '\0'}};
105 .red = strtol(groups[0], NULL, 16) / 255.0,
106 .green = strtol(groups[1], NULL, 16) / 255.0,
107 .blue = strtol(groups[2], NULL, 16) / 255.0,
108 .alpha = strtol(groups[3], NULL, 16) / 255.0,
109 .colorpixel = get_colorpixel(color)};
113 * Set the given color as the source color on the surface.
116 static void draw_util_set_source_color(xcb_connection_t *conn, surface_t *surface, color_t color) {
117 RETURN_UNLESS_SURFACE_INITIALIZED(surface);
120 cairo_set_source_rgba(surface->cr, color.red, color.green, color.blue, color.alpha);
122 uint32_t colorpixel = color.colorpixel;
123 xcb_change_gc(conn, surface->gc, XCB_GC_FOREGROUND | XCB_GC_BACKGROUND,
124 (uint32_t[]){colorpixel, colorpixel});
129 * Draw the given text using libi3.
130 * This function also marks the surface dirty which is needed if other means of
131 * drawing are used. This will be the case when using XCB to draw text.
134 void draw_util_text(i3String *text, surface_t *surface, color_t fg_color, color_t bg_color, int x, int y, int max_width) {
135 RETURN_UNLESS_SURFACE_INITIALIZED(surface);
138 /* Flush any changes before we draw the text as this might use XCB directly. */
139 CAIRO_SURFACE_FLUSH(surface->surface);
142 set_font_colors(surface->gc, fg_color.colorpixel, bg_color.colorpixel);
143 draw_text(text, surface->id, surface->gc, surface->visual_type, x, y, max_width);
146 /* Notify cairo that we (possibly) used another way to draw on the surface. */
147 cairo_surface_mark_dirty(surface->surface);
152 * Draws a filled rectangle.
153 * This function is a convenience wrapper and takes care of flushing the
154 * surface as well as restoring the cairo state.
157 void draw_util_rectangle(xcb_connection_t *conn, surface_t *surface, color_t color, double x, double y, double w, double h) {
158 RETURN_UNLESS_SURFACE_INITIALIZED(surface);
161 cairo_save(surface->cr);
163 /* Using the SOURCE operator will copy both color and alpha information directly
164 * onto the surface rather than blending it. This is a bit more efficient and
165 * allows better color control for the user when using opacity. */
166 cairo_set_operator(surface->cr, CAIRO_OPERATOR_SOURCE);
167 draw_util_set_source_color(conn, surface, color);
169 cairo_rectangle(surface->cr, x, y, w, h);
170 cairo_fill(surface->cr);
172 /* Make sure we flush the surface for any text drawing operations that could follow.
173 * Since we support drawing text via XCB, we need this. */
174 CAIRO_SURFACE_FLUSH(surface->surface);
176 cairo_restore(surface->cr);
178 draw_util_set_source_color(conn, surface, color);
180 xcb_rectangle_t rect = {x, y, w, h};
181 xcb_poly_fill_rectangle(conn, surface->id, surface->gc, 1, &rect);
186 * Clears a surface with the given color.
189 void draw_util_clear_surface(xcb_connection_t *conn, surface_t *surface, color_t color) {
190 RETURN_UNLESS_SURFACE_INITIALIZED(surface);
193 cairo_save(surface->cr);
195 /* Using the SOURCE operator will copy both color and alpha information directly
196 * onto the surface rather than blending it. This is a bit more efficient and
197 * allows better color control for the user when using opacity. */
198 cairo_set_operator(surface->cr, CAIRO_OPERATOR_SOURCE);
199 draw_util_set_source_color(conn, surface, color);
201 cairo_paint(surface->cr);
203 /* Make sure we flush the surface for any text drawing operations that could follow.
204 * Since we support drawing text via XCB, we need this. */
205 CAIRO_SURFACE_FLUSH(surface->surface);
207 cairo_restore(surface->cr);
209 draw_util_set_source_color(conn, surface, color);
211 xcb_rectangle_t rect = {0, 0, surface->width, surface->height};
212 xcb_poly_fill_rectangle(conn, surface->id, surface->gc, 1, &rect);
217 * Copies a surface onto another surface.
220 void draw_util_copy_surface(xcb_connection_t *conn, surface_t *src, surface_t *dest, double src_x, double src_y,
221 double dest_x, double dest_y, double width, double height) {
222 RETURN_UNLESS_SURFACE_INITIALIZED(src);
223 RETURN_UNLESS_SURFACE_INITIALIZED(dest);
226 cairo_save(dest->cr);
228 /* Using the SOURCE operator will copy both color and alpha information directly
229 * onto the surface rather than blending it. This is a bit more efficient and
230 * allows better color control for the user when using opacity. */
231 cairo_set_operator(dest->cr, CAIRO_OPERATOR_SOURCE);
232 cairo_set_source_surface(dest->cr, src->surface, dest_x - src_x, dest_y - src_y);
234 cairo_rectangle(dest->cr, dest_x, dest_y, width, height);
235 cairo_fill(dest->cr);
237 /* Make sure we flush the surface for any text drawing operations that could follow.
238 * Since we support drawing text via XCB, we need this. */
239 CAIRO_SURFACE_FLUSH(src->surface);
240 CAIRO_SURFACE_FLUSH(dest->surface);
242 cairo_restore(dest->cr);
244 xcb_copy_area(conn, src->id, dest->id, dest->gc, (int16_t)src_x, (int16_t)src_y,
245 (int16_t)dest_x, (int16_t)dest_y, (uint16_t)width, (uint16_t)height);