gri3-wm/i3bar/include/draw_util.h

104 lines
2.7 KiB
C

/*
* vim:ts=4:sw=4:expandtab
*
* © 2015 Ingo Bürk and contributors (see also: LICENSE)
*
* draw.h: Utility for drawing.
*
*/
#pragma once
#ifdef I3BAR_CAIRO
#include <cairo/cairo-xcb.h>
#endif
#ifdef I3BAR_CAIRO
/* We need to flush cairo surfaces twice to avoid an assertion bug. See #1989
* and https://bugs.freedesktop.org/show_bug.cgi?id=92455. */
#define CAIRO_SURFACE_FLUSH(surface) \
do { \
cairo_surface_flush(surface); \
cairo_surface_flush(surface); \
} while (0)
#endif
/* Represents a color split by color channel. */
typedef struct color_t {
double red;
double green;
double blue;
/* For compatibility, we also store the colorpixel for now. */
uint32_t colorpixel;
} color_t;
/* A wrapper grouping an XCB drawable and both a graphics context
* and the corresponding cairo objects representing it. */
typedef struct surface_t {
/* The drawable which is being represented. */
xcb_drawable_t id;
/* A classic XCB graphics context. */
xcb_gcontext_t gc;
int width;
int height;
#ifdef I3BAR_CAIRO
/* A cairo surface representing the drawable. */
cairo_surface_t *surface;
/* The cairo object representing the drawale. In general,
* this is what one should use for any drawing operation. */
cairo_t *cr;
#endif
} surface_t;
/**
* Initialize the surface to represent the given drawable.
*
*/
void draw_util_surface_init(surface_t *surface, xcb_drawable_t drawable, int width, int height);
/**
* Destroys the surface.
*
*/
void draw_util_surface_free(surface_t *surface);
/**
* Parses the given color in hex format to an internal color representation.
* Note that the input must begin with a hash sign, e.g., "#3fbc59".
*
*/
color_t draw_util_hex_to_color(const char *color);
/**
* Draw the given text using libi3.
* This function also marks the surface dirty which is needed if other means of
* drawing are used. This will be the case when using XCB to draw text.
*
*/
void draw_util_text(i3String *text, surface_t *surface, color_t fg_color, color_t bg_color, int x, int y, int max_width);
/**
* Draws a filled rectangle.
* This function is a convenience wrapper and takes care of flushing the
* surface as well as restoring the cairo state.
*
*/
void draw_util_rectangle(surface_t *surface, color_t color, double x, double y, double w, double h);
/**
* Clears a surface with the given color.
*
*/
void draw_util_clear_surface(surface_t *surface, color_t color);
/**
* Copies a surface onto another surface.
*
*/
void draw_util_copy_surface(surface_t *src, surface_t *dest, double src_x, double src_y,
double dest_x, double dest_y, double width, double height);