72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/*
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* vim:ts=4:sw=4:expandtab
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*
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* © 2015 Ingo Bürk and contributors (see also: LICENSE)
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*
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* cairo_util.c: Utility for operations using cairo.
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*
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*/
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#include <stdlib.h>
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#include <err.h>
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#include <xcb/xcb.h>
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#include <xcb/xcb_aux.h>
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#include <cairo/cairo-xcb.h>
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#include "common.h"
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#include "libi3.h"
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xcb_connection_t *xcb_connection;
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xcb_screen_t *root_screen;
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/*
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* Initialize the cairo surface to represent the given drawable.
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*
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*/
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void cairo_surface_init(surface_t *surface, xcb_drawable_t drawable, int width, int height) {
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surface->id = drawable;
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surface->gc = xcb_generate_id(xcb_connection);
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xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(xcb_connection, surface->gc, surface->id, 0, NULL);
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if (xcb_request_failed(gc_cookie, "Could not create graphical context"))
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exit(EXIT_FAILURE);
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surface->surface = cairo_xcb_surface_create(xcb_connection, surface->id, get_visualtype(root_screen), width, height);
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surface->cr = cairo_create(surface->surface);
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}
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/*
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* Destroys the surface.
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*
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*/
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void cairo_surface_free(surface_t *surface) {
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xcb_free_gc(xcb_connection, surface->gc);
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cairo_surface_destroy(surface->surface);
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cairo_destroy(surface->cr);
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}
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/*
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* Parses the given color in hex format to an internal color representation.
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* Note that the input must begin with a hash sign, e.g., "#3fbc59".
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*
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*/
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color_t cairo_hex_to_color(const char *color) {
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char groups[3][3] = {
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{color[1], color[2], '\0'},
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{color[3], color[4], '\0'},
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{color[5], color[6], '\0'}};
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return (color_t){
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.red = strtol(groups[0], NULL, 16) / 255.0,
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.green = strtol(groups[1], NULL, 16) / 255.0,
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.blue = strtol(groups[2], NULL, 16) / 255.0,
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.colorpixel = get_colorpixel(color)};
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}
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/*
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* Set the given color as the source color on the surface.
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*
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*/
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void cairo_set_source_color(surface_t *surface, color_t color) {
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cairo_set_source_rgb(surface->cr, color.red, color.green, color.blue);
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}
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