Initial stuff, experimented with it locally so far...

example/base.c

@@ -0,0 +1,18 @@
+#include <xolatile/xlesses.h>
+#include <xolatile/xlesses.c>
+
+int main (void) {
+	blesses_initialize ();
+
+	while (blesses_active != 0) {
+		blesses_render_string    ("Heyo world!", 8, 0, 0XCC6633, 0X3366CC);
+		blesses_render_character ('@',           8, 8, 0X3366CC, 0XCC6633);
+		blesses_render_character ('@',           0, 0, 0X3366CC, 0XCC6633);
+
+		blesses_synchronize ();
+	}
+
+	blesses_deinitialize ();
+
+	return (EXIT_SUCCESS);
+}

example/compile.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+set -xe
+
+gcc -g -ansi -Wall -Wextra -Wpedantic -o ./example/base ./example/base.c -lxcb -lxcb-image
+
+valgrind --show-leak-kinds=all --leak-check=full --log-file=./example/base.log ./example/base
+
+xighlight -V < ./example/base.log
+
+exit

install.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+set -xe
+
+cp xlesses.h /usr/include/xolatile/xlesses.h
+cp xlesses.c /usr/include/xolatile/xlesses.c
+
+exit

xlesses.c

@@ -0,0 +1,192 @@
+/*
+ * Copyright (c) 2023 : Ognjen 'xolatile' Milan Robovic
+ *
+ * Xlesses is free software! You will redistribute it or modify it under the terms of the GNU General Public License by Free Software Foundation.
+ * And when you do redistribute it or modify it, it will use either version 3 of the License, or (at yours truly opinion) any later version.
+ * It is distributed in the hope that it will be useful or harmful, it really depends... But no warranty what so ever, seriously. See GNU/GPLv3.
+ */
+
+#ifndef XLESSES_SOURCE
+#define XLESSES_SOURCE
+
+#include <xolatile/xlesses.h>
+#include <stdio.h>
+char * blesses_window_title    = "xolatile";
+int    blesses_window_width    = 640;
+int    blesses_window_height   = 480;
+int    blesses_active          = 1;
+int    blesses_cursor_x        = 0;
+int    blesses_cursor_y        = 0;
+int    blesses_signal          = 0;
+int  * blesses_sub_framebuffer = NULL;
+int  * blesses_framebuffer     = NULL;
+
+void (* blesses_action [BLESSES_SIGNAL_COUNT]) (void) = { NULL };
+
+xcb_window_t          blesses_window     = 0;
+xcb_gcontext_t        blesses_context    = 0;
+xcb_pixmap_t          blesses_pixmap     = 0;
+xcb_connection_t    * blesses_connection = NULL;
+xcb_screen_t        * blesses_screen     = NULL;
+xcb_image_t         * blesses_image      = NULL;
+
+void blesses_initialize (void) {
+	unsigned int window_flags [2] = {
+		0,
+		XCB_EVENT_MASK_NO_EVENT        |
+		XCB_EVENT_MASK_EXPOSURE        |
+		XCB_EVENT_MASK_RESIZE_REDIRECT |
+		XCB_EVENT_MASK_KEY_RELEASE     |
+		XCB_EVENT_MASK_KEY_PRESS       |
+		XCB_EVENT_MASK_BUTTON_RELEASE  |
+		XCB_EVENT_MASK_BUTTON_PRESS
+	};
+
+	unsigned short int window_width  = (unsigned short int) blesses_window_width;
+	unsigned short int window_height = (unsigned short int) blesses_window_height;
+
+	blesses_connection = xcb_connect (NULL, NULL);
+
+	log_in (LOG_FAILURE, blesses_connection == NULL, "blesses : blesses_initialize : XCB connection is null pointer.");
+
+	blesses_screen = xcb_setup_roots_iterator (xcb_get_setup (blesses_connection)).data;
+
+	blesses_window  = xcb_generate_id (blesses_connection);
+	blesses_context = xcb_generate_id (blesses_connection);
+	blesses_pixmap  = xcb_generate_id (blesses_connection);
+
+	window_flags [0] = blesses_screen->black_pixel;
+
+	xcb_create_window (blesses_connection, blesses_screen->root_depth, blesses_window, blesses_screen->root, 0, 0, window_width, window_height, 10, XCB_WINDOW_CLASS_INPUT_OUTPUT,
+	                   blesses_screen->root_visual, XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK, window_flags);
+
+	xcb_map_window (blesses_connection, blesses_window);
+
+	xcb_change_property (blesses_connection, XCB_PROP_MODE_REPLACE, blesses_window, XCB_ATOM_WM_NAME, XCB_ATOM_STRING, 8, string_length (blesses_window_title), blesses_window_title);
+
+	xcb_create_pixmap (blesses_connection, blesses_screen->root_depth, blesses_pixmap, blesses_window, window_width, window_height);
+
+	xcb_create_gc (blesses_connection, blesses_context, blesses_pixmap, 0, NULL);
+
+	xcb_flush (blesses_connection);
+
+	blesses_sub_framebuffer = allocate (blesses_window_width * blesses_window_height * (int) sizeof (* blesses_sub_framebuffer) / 4);
+	blesses_framebuffer     = allocate (blesses_window_width * blesses_window_height * (int) sizeof (* blesses_framebuffer));
+
+	log_out ();
+}
+
+void blesses_deinitialize (void) {
+	blesses_sub_framebuffer = deallocate (blesses_sub_framebuffer);
+	blesses_framebuffer     = deallocate (blesses_framebuffer);
+
+	xcb_free_gc (blesses_connection, blesses_context);
+
+	xcb_free_pixmap (blesses_connection, blesses_pixmap);
+
+	xcb_destroy_window (blesses_connection, blesses_window);
+
+	xcb_disconnect (blesses_connection);
+}
+
+void blesses_synchronize (void) {
+	int i = 0;
+	int j = 0;
+
+	xcb_generic_event_t * generic_event = NULL;
+
+	for (i = 0; i != blesses_window_width * blesses_window_height; i++) {
+		blesses_framebuffer [i] = blesses_sub_framebuffer [((i / blesses_window_width) / 2) * (blesses_window_width / 2) + (i % blesses_window_width) / 2];
+	}
+
+	blesses_sub_framebuffer = deallocate (blesses_sub_framebuffer);
+
+	blesses_image = xcb_image_create_native (blesses_connection, blesses_window_width, blesses_window_height, XCB_IMAGE_FORMAT_Z_PIXMAP, blesses_screen->root_depth,
+	                                         blesses_framebuffer, (unsigned int) (blesses_window_width * blesses_window_height * (int) sizeof (* blesses_framebuffer)),
+	                                         (unsigned char *) blesses_framebuffer);
+
+	xcb_image_put (blesses_connection, blesses_pixmap, blesses_context, blesses_image, 0, 0, 0);
+
+	xcb_image_destroy (blesses_image);
+
+	xcb_copy_area (blesses_connection, blesses_pixmap, blesses_window, blesses_context, 0, 0, 0, 0, blesses_window_width, blesses_window_height);
+
+	blesses_framebuffer = NULL;
+
+	generic_event = xcb_wait_for_event (blesses_connection);
+
+	switch (generic_event->response_type & 127) {
+		case XCB_EXPOSE: {
+			xcb_flush (blesses_connection);
+		} break;
+		case XCB_KEY_PRESS: {
+			blesses_signal = (int) ((xcb_key_press_event_t *) generic_event)->detail;
+			if (blesses_signal == 24) {
+				blesses_active = 0;
+			}
+		} break;
+		default: {
+			echo ("--\n");
+		} break;
+	}
+
+	generic_event = deallocate (generic_event);
+
+	if ((blesses_sub_framebuffer == NULL) && (blesses_framebuffer == NULL)) {
+		blesses_sub_framebuffer = allocate (blesses_window_width * blesses_window_height * (int) sizeof (* blesses_sub_framebuffer) / 4);
+		blesses_framebuffer     = allocate (blesses_window_width * blesses_window_height * (int) sizeof (* blesses_framebuffer));
+	}
+
+	log_out ();
+}
+
+void blesses_render_character (char character, int x, int y, int foreground, int background) {
+	const unsigned long int font_code ['~' - ' ' + 1] = {
+		0X0000000000000000, 0X00180018183C3C18, 0X0000000000363636, 0X006C6CFE6CFE6C6C, 0X00187ED07C16FC30, 0X0060660C18306606, 0X00DC66B61C36361C, 0X0000000000181818,
+		0X0030180C0C0C1830, 0X000C18303030180C, 0X0000187E3C7E1800, 0X000018187E181800, 0X0C18180000000000, 0X000000007E000000, 0X0018180000000000, 0X0000060C18306000,
+		0X003C666E7E76663C, 0X007E181818181C18, 0X007E0C183060663C, 0X003C66603860663C, 0X0030307E363C3830, 0X003C6660603E067E, 0X003C66663E060C38, 0X000C0C0C1830607E,
+		0X003C66663C66663C, 0X001C30607C66663C, 0X0018180018180000, 0X0C18180018180000, 0X0030180C060C1830, 0X0000007E007E0000, 0X000C18306030180C, 0X001800181830663C,
+		0X003C06765676663C, 0X006666667E66663C, 0X003E66663E66663E, 0X003C66060606663C, 0X001E36666666361E, 0X007E06063E06067E, 0X000606063E06067E, 0X003C66667606663C,
+		0X006666667E666666, 0X007E18181818187E, 0X001C36303030307C, 0X0066361E0E1E3666, 0X007E060606060606, 0X00C6C6D6D6FEEEC6, 0X006666767E6E6666, 0X003C66666666663C,
+		0X000606063E66663E, 0X006C36566666663C, 0X006666363E66663E, 0X003C66603C06663C, 0X001818181818187E, 0X003C666666666666, 0X00183C6666666666, 0X00C6EEFED6D6C6C6,
+		0X0066663C183C6666, 0X001818183C666666, 0X007E060C1830607E, 0X003E06060606063E, 0X00006030180C0600, 0X007C60606060607C, 0X000000000000663C, 0XFFFF000000000000,
+		0X000000000030180C, 0X007C667C603C0000, 0X003E6666663E0606, 0X003C6606663C0000, 0X007C6666667C6060, 0X003C067E663C0000, 0X000C0C0C3E0C0C38, 0X3C607C66667C0000,
+		0X00666666663E0606, 0X003C1818181C0018, 0X0E181818181C0018, 0X0066361E36660606, 0X003C18181818181C, 0X00C6D6D6FE6C0000, 0X00666666663E0000, 0X003C6666663C0000,
+		0X06063E66663E0000, 0XE0607C66667C0000, 0X000606066E360000, 0X003E603C067C0000, 0X00380C0C0C3E0C0C, 0X007C666666660000, 0X00183C6666660000, 0X006CFED6D6C60000,
+		0X00663C183C660000, 0X3C607C6666660000, 0X007E0C18307E0000, 0X003018180E181830, 0X0018181818181818, 0X000C18187018180C, 0X000000000062D68C, 0X0000000000000000
+	};
+
+	int offset = 0;
+
+	log_in (LOG_WARNING, blesses_sub_framebuffer == NULL,    "blesses : render_character : Sub framebuffer was not allocated.");
+	log_in (LOG_WARNING, blesses_framebuffer     == NULL,    "blesses : render_character : Framebuffer was not allocated.");
+	log_in (LOG_WARNING, character_is_invisible (character), "blesses : render_character : Character is not in visible ASCII range.");
+
+	for (offset = 0; offset != BLESSES_FONT_WIDTH * BLESSES_FONT_HEIGHT; ++offset) {
+		int u = offset / BLESSES_FONT_WIDTH + y;
+		int v = offset % BLESSES_FONT_WIDTH + x;
+
+		blesses_sub_framebuffer [u * (blesses_window_width / 2) + v] = ((font_code [(int) (character - ' ')] >> offset) % 2) ? foreground : background;
+	}
+
+	log_out ();
+}
+
+void blesses_render_string (char * string, int x, int y, int foreground, int background) {
+	int offset = 0;
+
+	do {
+		if (string [offset] == '\t') {
+			x += BLESSES_FONT_WIDTH * 3;
+		} else if (string [offset] == '\n') {
+			y += BLESSES_FONT_HEIGHT;
+			x *= 0;
+		} else {
+			blesses_render_character (string [offset], x, y, foreground, background);
+		}
+
+		x += BLESSES_FONT_WIDTH;
+	} while (++offset != string_length (string));
+}
+
+#endif

xlesses.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2023 : Ognjen 'xolatile' Milan Robovic
+ *
+ * Xlesses is free software! You will redistribute it or modify it under the terms of the GNU General Public License by Free Software Foundation.
+ * And when you do redistribute it or modify it, it will use either version 3 of the License, or (at yours truly opinion) any later version.
+ * It is distributed in the hope that it will be useful or harmful, it really depends... But no warranty what so ever, seriously. See GNU/GPLv3.
+ */
+
+#ifndef XLESSES_HEADER
+#define XLESSES_HEADER
+
+#include <xolatile/xtandard.h>
+#include <xolatile/xtandard.c>
+
+#include <xcb/xcb.h>
+#include <xcb/xcb_atom.h>
+#include <xcb/xcb_image.h>
+
+#define BLESSES_FONT_WIDTH  (8)
+#define BLESSES_FONT_HEIGHT (8)
+
+#define BLESSES_SIGNAL_COUNT (144)
+
+extern char * blesses_window_title;
+extern int    blesses_window_width;
+extern int    blesses_window_height;
+extern int    blesses_active;
+extern int    blesses_cursor_x;
+extern int    blesses_cursor_y;
+extern int    blesses_signal;
+extern int  * blesses_sub_framebuffer;
+extern int  * blesses_framebuffer;
+
+extern void (* blesses_action [BLESSES_SIGNAL_COUNT]) (void);
+
+extern xcb_window_t          blesses_window;
+extern xcb_gcontext_t        blesses_context;
+extern xcb_pixmap_t          blesses_pixmap;
+extern xcb_connection_t    * blesses_connection;
+extern xcb_screen_t        * blesses_screen;
+extern xcb_image_t         * blesses_image;
+
+extern void blesses_initialize   (void);
+extern void blesses_deinitialize (void);
+extern void blesses_synchronize  (void);
+
+extern void blesses_render_character (char,   int, int, int, int);
+extern void blesses_render_string    (char *, int, int, int, int);
+
+#endif