Move draw_util.c to libi3.
In order to prepare for using cairo for rendering i3 decorations, we need to make the draw_util.c from i3bar available via libi3 such that both i3bar and i3 can use it. relates to #1278
This commit is contained in:
Ingo Bürk
204
libi3/draw_util.c
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204
libi3/draw_util.c
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/*
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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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* draw.c: Utility for drawing.
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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 <string.h>
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#include <xcb/xcb.h>
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#include <xcb/xcb_aux.h>
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#ifdef CAIRO_SUPPORT
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#include <cairo/cairo-xcb.h>
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#endif
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#include "libi3.h"
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xcb_connection_t *xcb_connection;
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xcb_visualtype_t *visual_type;
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/* Forward declarations */
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static void draw_util_set_source_color(surface_t *surface, color_t color);
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/*
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* Initialize the surface to represent the given drawable.
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*
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*/
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void draw_util_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->width = width;
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surface->height = height;
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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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xcb_generic_error_t *error = xcb_request_check(xcb_connection, gc_cookie);
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if (error != NULL) {
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ELOG("Could not create graphical context. Error code: %d\n", error->error_code);
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exit(EXIT_FAILURE);
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}
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#ifdef CAIRO_SUPPORT
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surface->surface = cairo_xcb_surface_create(xcb_connection, surface->id, visual_type, width, height);
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surface->cr = cairo_create(surface->surface);
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#endif
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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 draw_util_surface_free(surface_t *surface) {
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xcb_free_gc(xcb_connection, surface->gc);
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#ifdef CAIRO_SUPPORT
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cairo_surface_destroy(surface->surface);
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cairo_destroy(surface->cr);
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#endif
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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 draw_util_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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static void draw_util_set_source_color(surface_t *surface, color_t color) {
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#ifdef CAIRO_SUPPORT
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cairo_set_source_rgb(surface->cr, color.red, color.green, color.blue);
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#else
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uint32_t colorpixel = color.colorpixel;
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xcb_change_gc(xcb_connection, surface->gc, XCB_GC_FOREGROUND | XCB_GC_BACKGROUND,
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(uint32_t[]){colorpixel, colorpixel});
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#endif
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}
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/**
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* Draw the given text using libi3.
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* This function also marks the surface dirty which is needed if other means of
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* drawing are used. This will be the case when using XCB to draw text.
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*
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*/
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void draw_util_text(i3String *text, surface_t *surface, color_t fg_color, color_t bg_color, int x, int y, int max_width) {
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#ifdef CAIRO_SUPPORT
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/* Flush any changes before we draw the text as this might use XCB directly. */
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CAIRO_SURFACE_FLUSH(surface->surface);
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#endif
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set_font_colors(surface->gc, fg_color.colorpixel, bg_color.colorpixel);
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draw_text(text, surface->id, surface->gc, visual_type, x, y, max_width);
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#ifdef CAIRO_SUPPORT
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/* Notify cairo that we (possibly) used another way to draw on the surface. */
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cairo_surface_mark_dirty(surface->surface);
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#endif
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}
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/**
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* Draws a filled rectangle.
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* This function is a convenience wrapper and takes care of flushing the
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* surface as well as restoring the cairo state.
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*
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*/
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void draw_util_rectangle(surface_t *surface, color_t color, double x, double y, double w, double h) {
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#ifdef CAIRO_SUPPORT
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cairo_save(surface->cr);
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/* Using the SOURCE operator will copy both color and alpha information directly
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* onto the surface rather than blending it. This is a bit more efficient and
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* allows better color control for the user when using opacity. */
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cairo_set_operator(surface->cr, CAIRO_OPERATOR_SOURCE);
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draw_util_set_source_color(surface, color);
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cairo_rectangle(surface->cr, x, y, w, h);
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cairo_fill(surface->cr);
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/* Make sure we flush the surface for any text drawing operations that could follow.
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* Since we support drawing text via XCB, we need this. */
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CAIRO_SURFACE_FLUSH(surface->surface);
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cairo_restore(surface->cr);
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#else
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draw_util_set_source_color(surface, color);
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xcb_rectangle_t rect = {x, y, w, h};
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xcb_poly_fill_rectangle(xcb_connection, surface->id, surface->gc, 1, &rect);
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#endif
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}
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/**
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* Clears a surface with the given color.
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*
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*/
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void draw_util_clear_surface(surface_t *surface, color_t color) {
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#ifdef CAIRO_SUPPORT
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cairo_save(surface->cr);
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/* Using the SOURCE operator will copy both color and alpha information directly
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* onto the surface rather than blending it. This is a bit more efficient and
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* allows better color control for the user when using opacity. */
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cairo_set_operator(surface->cr, CAIRO_OPERATOR_SOURCE);
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draw_util_set_source_color(surface, color);
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cairo_paint(surface->cr);
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/* Make sure we flush the surface for any text drawing operations that could follow.
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* Since we support drawing text via XCB, we need this. */
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CAIRO_SURFACE_FLUSH(surface->surface);
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cairo_restore(surface->cr);
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#else
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draw_util_set_source_color(surface, color);
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xcb_rectangle_t rect = {0, 0, surface->width, surface->height};
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xcb_poly_fill_rectangle(xcb_connection, surface->id, surface->gc, 1, &rect);
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#endif
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}
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/**
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* Copies a surface onto another surface.
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*
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*/
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void draw_util_copy_surface(surface_t *src, surface_t *dest, double src_x, double src_y,
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double dest_x, double dest_y, double width, double height) {
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#ifdef CAIRO_SUPPORT
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cairo_save(dest->cr);
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/* Using the SOURCE operator will copy both color and alpha information directly
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* onto the surface rather than blending it. This is a bit more efficient and
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* allows better color control for the user when using opacity. */
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cairo_set_operator(dest->cr, CAIRO_OPERATOR_SOURCE);
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cairo_set_source_surface(dest->cr, src->surface, dest_x - src_x, src_y);
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cairo_rectangle(dest->cr, dest_x, dest_y, width, height);
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cairo_fill(dest->cr);
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/* Make sure we flush the surface for any text drawing operations that could follow.
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* Since we support drawing text via XCB, we need this. */
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CAIRO_SURFACE_FLUSH(src->surface);
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CAIRO_SURFACE_FLUSH(dest->surface);
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cairo_restore(dest->cr);
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#else
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xcb_copy_area(xcb_connection, src->id, dest->id, dest->gc, (int16_t)src_x, (int16_t)src_y,
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(int16_t)dest_x, (int16_t)dest_y, (uint16_t)width, (uint16_t)height);
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#endif
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}
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