/* * vim:ts=4:sw=4:expandtab * * © 2015 Ingo Bürk and contributors (see also: LICENSE) * * draw.c: Utility for drawing. * */ #include #include #include #include #include #ifdef CAIRO_SUPPORT #include #endif #include "libi3.h" /* The default visual_type to use if none is specified when creating the surface. Must be defined globally. */ xcb_visualtype_t *visual_type; /* Forward declarations */ static void draw_util_set_source_color(xcb_connection_t *conn, surface_t *surface, color_t color); #define RETURN_UNLESS_SURFACE_INITIALIZED(surface) \ do { \ if ((surface)->id == XCB_NONE) { \ ELOG("Surface %p is not initialized, skipping drawing.\n", surface); \ return; \ } \ } while (0) /* * Initialize the surface to represent the given drawable. * */ void draw_util_surface_init(xcb_connection_t *conn, surface_t *surface, xcb_drawable_t drawable, xcb_visualtype_t *visual, int width, int height) { surface->id = drawable; surface->visual_type = ((visual == NULL) ? visual_type : visual); surface->width = width; surface->height = height; surface->gc = xcb_generate_id(conn); xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(conn, surface->gc, surface->id, 0, NULL); xcb_generic_error_t *error = xcb_request_check(conn, gc_cookie); if (error != NULL) { ELOG("Could not create graphical context. Error code: %d. Please report this bug.\n", error->error_code); } #ifdef CAIRO_SUPPORT surface->surface = cairo_xcb_surface_create(conn, surface->id, surface->visual_type, width, height); surface->cr = cairo_create(surface->surface); #endif } /* * Destroys the surface. * */ void draw_util_surface_free(xcb_connection_t *conn, surface_t *surface) { xcb_free_gc(conn, surface->gc); #ifdef CAIRO_SUPPORT cairo_surface_destroy(surface->surface); cairo_destroy(surface->cr); /* We need to explicitly set these to NULL to avoid assertion errors in * cairo when calling this multiple times. This can happen, for example, * when setting the border of a window to none and then closing it. */ surface->surface = NULL; surface->cr = NULL; #endif } /* * Resize the surface to the given size. * */ void draw_util_surface_set_size(surface_t *surface, int width, int height) { surface->width = width; surface->height = height; #ifdef CAIRO_SUPPORT cairo_xcb_surface_set_size(surface->surface, width, height); #endif } /* * 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) { char alpha[2]; if (strlen(color) == strlen("#rrggbbaa")) { alpha[0] = color[7]; alpha[1] = color[8]; } else { alpha[0] = alpha[1] = 'F'; } char groups[4][3] = { {color[1], color[2], '\0'}, {color[3], color[4], '\0'}, {color[5], color[6], '\0'}, {alpha[0], alpha[1], '\0'}}; return (color_t){ .red = strtol(groups[0], NULL, 16) / 255.0, .green = strtol(groups[1], NULL, 16) / 255.0, .blue = strtol(groups[2], NULL, 16) / 255.0, .alpha = strtol(groups[3], NULL, 16) / 255.0, .colorpixel = get_colorpixel(color)}; } /* * Set the given color as the source color on the surface. * */ static void draw_util_set_source_color(xcb_connection_t *conn, surface_t *surface, color_t color) { RETURN_UNLESS_SURFACE_INITIALIZED(surface); #ifdef CAIRO_SUPPORT cairo_set_source_rgba(surface->cr, color.red, color.green, color.blue, color.alpha); #else uint32_t colorpixel = color.colorpixel; xcb_change_gc(conn, surface->gc, XCB_GC_FOREGROUND | XCB_GC_BACKGROUND, (uint32_t[]){colorpixel, colorpixel}); #endif } /** * 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) { RETURN_UNLESS_SURFACE_INITIALIZED(surface); #ifdef CAIRO_SUPPORT /* Flush any changes before we draw the text as this might use XCB directly. */ CAIRO_SURFACE_FLUSH(surface->surface); #endif set_font_colors(surface->gc, fg_color, bg_color); draw_text(text, surface->id, surface->gc, surface->visual_type, x, y, max_width); #ifdef CAIRO_SUPPORT /* Notify cairo that we (possibly) used another way to draw on the surface. */ cairo_surface_mark_dirty(surface->surface); #endif } /** * 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(xcb_connection_t *conn, surface_t *surface, color_t color, double x, double y, double w, double h) { RETURN_UNLESS_SURFACE_INITIALIZED(surface); #ifdef CAIRO_SUPPORT cairo_save(surface->cr); /* Using the SOURCE operator will copy both color and alpha information directly * onto the surface rather than blending it. This is a bit more efficient and * allows better color control for the user when using opacity. */ cairo_set_operator(surface->cr, CAIRO_OPERATOR_SOURCE); draw_util_set_source_color(conn, surface, color); cairo_rectangle(surface->cr, x, y, w, h); cairo_fill(surface->cr); /* Make sure we flush the surface for any text drawing operations that could follow. * Since we support drawing text via XCB, we need this. */ CAIRO_SURFACE_FLUSH(surface->surface); cairo_restore(surface->cr); #else draw_util_set_source_color(conn, surface, color); xcb_rectangle_t rect = {x, y, w, h}; xcb_poly_fill_rectangle(conn, surface->id, surface->gc, 1, &rect); #endif } /** * Clears a surface with the given color. * */ void draw_util_clear_surface(xcb_connection_t *conn, surface_t *surface, color_t color) { RETURN_UNLESS_SURFACE_INITIALIZED(surface); #ifdef CAIRO_SUPPORT cairo_save(surface->cr); /* Using the SOURCE operator will copy both color and alpha information directly * onto the surface rather than blending it. This is a bit more efficient and * allows better color control for the user when using opacity. */ cairo_set_operator(surface->cr, CAIRO_OPERATOR_SOURCE); draw_util_set_source_color(conn, surface, color); cairo_paint(surface->cr); /* Make sure we flush the surface for any text drawing operations that could follow. * Since we support drawing text via XCB, we need this. */ CAIRO_SURFACE_FLUSH(surface->surface); cairo_restore(surface->cr); #else draw_util_set_source_color(conn, surface, color); xcb_rectangle_t rect = {0, 0, surface->width, surface->height}; xcb_poly_fill_rectangle(conn, surface->id, surface->gc, 1, &rect); #endif } /** * Copies a surface onto another surface. * */ void draw_util_copy_surface(xcb_connection_t *conn, surface_t *src, surface_t *dest, double src_x, double src_y, double dest_x, double dest_y, double width, double height) { RETURN_UNLESS_SURFACE_INITIALIZED(src); RETURN_UNLESS_SURFACE_INITIALIZED(dest); #ifdef CAIRO_SUPPORT cairo_save(dest->cr); /* Using the SOURCE operator will copy both color and alpha information directly * onto the surface rather than blending it. This is a bit more efficient and * allows better color control for the user when using opacity. */ cairo_set_operator(dest->cr, CAIRO_OPERATOR_SOURCE); cairo_set_source_surface(dest->cr, src->surface, dest_x - src_x, dest_y - src_y); cairo_rectangle(dest->cr, dest_x, dest_y, width, height); cairo_fill(dest->cr); /* Make sure we flush the surface for any text drawing operations that could follow. * Since we support drawing text via XCB, we need this. */ CAIRO_SURFACE_FLUSH(src->surface); CAIRO_SURFACE_FLUSH(dest->surface); cairo_restore(dest->cr); #else xcb_copy_area(conn, src->id, dest->id, dest->gc, (int16_t)src_x, (int16_t)src_y, (int16_t)dest_x, (int16_t)dest_y, (uint16_t)width, (uint16_t)height); #endif }