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-rw-r--r--userland/libgui/Makefile17
-rw-r--r--userland/libgui/font.h3
-rw-r--r--userland/libgui/libgui.c290
-rw-r--r--userland/libgui/libgui.h34
4 files changed, 344 insertions, 0 deletions
diff --git a/userland/libgui/Makefile b/userland/libgui/Makefile
new file mode 100644
index 0000000..5a895c4
--- /dev/null
+++ b/userland/libgui/Makefile
@@ -0,0 +1,17 @@
+CC="/home/anton/prj/osdev/sysroot/bin/i686-sb-gcc"
+AR="/home/anton/prj/osdev/sysroot/bin/i686-sb-ar"
+#CFLAGS = -ggdb -ffreestanding -O0 -Wall -Wextra -pedantic -mgeneral-regs-only -Wimplicit-fallthrough -nostdlib -static -Wno-undef -fsanitize=shift,signed-integer-overflow,bounds
+CFLAGS = -O2 -ggdb -ffreestanding -O0 -Wall -Wextra -pedantic -mgeneral-regs-only -Wimplicit-fallthrough -nostdlib -static -Wno-undef
+BINS=libgui.a
+all: $(BINS)
+LIBS=-L../libc -lc -L../json -ljson -lgcc
+OBJ=libgui.o
+
+libgui.o: libgui.c
+ $(CC) $(CFLAGS) -c libgui.c -I../libc/ -I../json/ $(LIBS)
+
+libgui.a: $(OBJ)
+ $(AR) rcs libgui.a $^
+
+clean:
+ rm $(OBJ) $(BINS)
diff --git a/userland/libgui/font.h b/userland/libgui/font.h
new file mode 100644
index 0000000..763b438
--- /dev/null
+++ b/userland/libgui/font.h
@@ -0,0 +1,3 @@
+#ifndef FONT_H
+#define FONT_H
+#endif
diff --git a/userland/libgui/libgui.c b/userland/libgui/libgui.c
new file mode 100644
index 0000000..5f5526d
--- /dev/null
+++ b/userland/libgui/libgui.c
@@ -0,0 +1,290 @@
+#include "libgui.h"
+#include "font.h"
+#include <assert.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#define place_pixel_pos(_p, _pos) \
+ { *(uint32_t *)(w->bitmap_ptr + _pos) = _p; }
+
+static const unsigned char font8x8_basic[128][8] = {
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0000 (nul)
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0001
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0002
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0003
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0004
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0005
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0006
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0007
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0008
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0009
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+000A
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+000B
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+000C
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+000D
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+000E
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+000F
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0010
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0011
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0012
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0013
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0014
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0015
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0016
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0017
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0018
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0019
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+001A
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+001B
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+001C
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+001D
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+001E
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+001F
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0020 (space)
+ {0x18, 0x3C, 0x3C, 0x18, 0x18, 0x00, 0x18, 0x00}, // U+0021 (!)
+ {0x36, 0x36, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0022 (")
+ {0x36, 0x36, 0x7F, 0x36, 0x7F, 0x36, 0x36, 0x00}, // U+0023 (#)
+ {0x0C, 0x3E, 0x03, 0x1E, 0x30, 0x1F, 0x0C, 0x00}, // U+0024 ($)
+ {0x00, 0x63, 0x33, 0x18, 0x0C, 0x66, 0x63, 0x00}, // U+0025 (%)
+ {0x1C, 0x36, 0x1C, 0x6E, 0x3B, 0x33, 0x6E, 0x00}, // U+0026 (&)
+ {0x06, 0x06, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0027 (')
+ {0x18, 0x0C, 0x06, 0x06, 0x06, 0x0C, 0x18, 0x00}, // U+0028 (()
+ {0x06, 0x0C, 0x18, 0x18, 0x18, 0x0C, 0x06, 0x00}, // U+0029 ())
+ {0x00, 0x66, 0x3C, 0xFF, 0x3C, 0x66, 0x00, 0x00}, // U+002A (*)
+ {0x00, 0x0C, 0x0C, 0x3F, 0x0C, 0x0C, 0x00, 0x00}, // U+002B (+)
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x0C, 0x0C, 0x06}, // U+002C (,)
+ {0x00, 0x00, 0x00, 0x3F, 0x00, 0x00, 0x00, 0x00}, // U+002D (-)
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x0C, 0x0C, 0x00}, // U+002E (.)
+ {0x60, 0x30, 0x18, 0x0C, 0x06, 0x03, 0x01, 0x00}, // U+002F (/)
+ {0x3E, 0x63, 0x73, 0x7B, 0x6F, 0x67, 0x3E, 0x00}, // U+0030 (0)
+ {0x0C, 0x0E, 0x0C, 0x0C, 0x0C, 0x0C, 0x3F, 0x00}, // U+0031 (1)
+ {0x1E, 0x33, 0x30, 0x1C, 0x06, 0x33, 0x3F, 0x00}, // U+0032 (2)
+ {0x1E, 0x33, 0x30, 0x1C, 0x30, 0x33, 0x1E, 0x00}, // U+0033 (3)
+ {0x38, 0x3C, 0x36, 0x33, 0x7F, 0x30, 0x78, 0x00}, // U+0034 (4)
+ {0x3F, 0x03, 0x1F, 0x30, 0x30, 0x33, 0x1E, 0x00}, // U+0035 (5)
+ {0x1C, 0x06, 0x03, 0x1F, 0x33, 0x33, 0x1E, 0x00}, // U+0036 (6)
+ {0x3F, 0x33, 0x30, 0x18, 0x0C, 0x0C, 0x0C, 0x00}, // U+0037 (7)
+ {0x1E, 0x33, 0x33, 0x1E, 0x33, 0x33, 0x1E, 0x00}, // U+0038 (8)
+ {0x1E, 0x33, 0x33, 0x3E, 0x30, 0x18, 0x0E, 0x00}, // U+0039 (9)
+ {0x00, 0x0C, 0x0C, 0x00, 0x00, 0x0C, 0x0C, 0x00}, // U+003A (:)
+ {0x00, 0x0C, 0x0C, 0x00, 0x00, 0x0C, 0x0C, 0x06}, // U+003B (;)
+ {0x18, 0x0C, 0x06, 0x03, 0x06, 0x0C, 0x18, 0x00}, // U+003C (<)
+ {0x00, 0x00, 0x3F, 0x00, 0x00, 0x3F, 0x00, 0x00}, // U+003D (=)
+ {0x06, 0x0C, 0x18, 0x30, 0x18, 0x0C, 0x06, 0x00}, // U+003E (>)
+ {0x1E, 0x33, 0x30, 0x18, 0x0C, 0x00, 0x0C, 0x00}, // U+003F (?)
+ {0x3E, 0x63, 0x7B, 0x7B, 0x7B, 0x03, 0x1E, 0x00}, // U+0040 (@)
+ {0x0C, 0x1E, 0x33, 0x33, 0x3F, 0x33, 0x33, 0x00}, // U+0041 (A)
+ {0x3F, 0x66, 0x66, 0x3E, 0x66, 0x66, 0x3F, 0x00}, // U+0042 (B)
+ {0x3C, 0x66, 0x03, 0x03, 0x03, 0x66, 0x3C, 0x00}, // U+0043 (C)
+ {0x1F, 0x36, 0x66, 0x66, 0x66, 0x36, 0x1F, 0x00}, // U+0044 (D)
+ {0x7F, 0x46, 0x16, 0x1E, 0x16, 0x46, 0x7F, 0x00}, // U+0045 (E)
+ {0x7F, 0x46, 0x16, 0x1E, 0x16, 0x06, 0x0F, 0x00}, // U+0046 (F)
+ {0x3C, 0x66, 0x03, 0x03, 0x73, 0x66, 0x7C, 0x00}, // U+0047 (G)
+ {0x33, 0x33, 0x33, 0x3F, 0x33, 0x33, 0x33, 0x00}, // U+0048 (H)
+ {0x1E, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x1E, 0x00}, // U+0049 (I)
+ {0x78, 0x30, 0x30, 0x30, 0x33, 0x33, 0x1E, 0x00}, // U+004A (J)
+ {0x67, 0x66, 0x36, 0x1E, 0x36, 0x66, 0x67, 0x00}, // U+004B (K)
+ {0x0F, 0x06, 0x06, 0x06, 0x46, 0x66, 0x7F, 0x00}, // U+004C (L)
+ {0x63, 0x77, 0x7F, 0x7F, 0x6B, 0x63, 0x63, 0x00}, // U+004D (M)
+ {0x63, 0x67, 0x6F, 0x7B, 0x73, 0x63, 0x63, 0x00}, // U+004E (N)
+ {0x1C, 0x36, 0x63, 0x63, 0x63, 0x36, 0x1C, 0x00}, // U+004F (O)
+ {0x3F, 0x66, 0x66, 0x3E, 0x06, 0x06, 0x0F, 0x00}, // U+0050 (P)
+ {0x1E, 0x33, 0x33, 0x33, 0x3B, 0x1E, 0x38, 0x00}, // U+0051 (Q)
+ {0x3F, 0x66, 0x66, 0x3E, 0x36, 0x66, 0x67, 0x00}, // U+0052 (R)
+ {0x1E, 0x33, 0x07, 0x0E, 0x38, 0x33, 0x1E, 0x00}, // U+0053 (S)
+ {0x3F, 0x2D, 0x0C, 0x0C, 0x0C, 0x0C, 0x1E, 0x00}, // U+0054 (T)
+ {0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x3F, 0x00}, // U+0055 (U)
+ {0x33, 0x33, 0x33, 0x33, 0x33, 0x1E, 0x0C, 0x00}, // U+0056 (V)
+ {0x63, 0x63, 0x63, 0x6B, 0x7F, 0x77, 0x63, 0x00}, // U+0057 (W)
+ {0x63, 0x63, 0x36, 0x1C, 0x1C, 0x36, 0x63, 0x00}, // U+0058 (X)
+ {0x33, 0x33, 0x33, 0x1E, 0x0C, 0x0C, 0x1E, 0x00}, // U+0059 (Y)
+ {0x7F, 0x63, 0x31, 0x18, 0x4C, 0x66, 0x7F, 0x00}, // U+005A (Z)
+ {0x1E, 0x06, 0x06, 0x06, 0x06, 0x06, 0x1E, 0x00}, // U+005B ([)
+ {0x03, 0x06, 0x0C, 0x18, 0x30, 0x60, 0x40, 0x00}, // U+005C (\)
+ {0x1E, 0x18, 0x18, 0x18, 0x18, 0x18, 0x1E, 0x00}, // U+005D (])
+ {0x08, 0x1C, 0x36, 0x63, 0x00, 0x00, 0x00, 0x00}, // U+005E (^)
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF}, // U+005F (_)
+ {0x0C, 0x0C, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0060 (`)
+ {0x00, 0x00, 0x1E, 0x30, 0x3E, 0x33, 0x6E, 0x00}, // U+0061 (a)
+ {0x07, 0x06, 0x06, 0x3E, 0x66, 0x66, 0x3B, 0x00}, // U+0062 (b)
+ {0x00, 0x00, 0x1E, 0x33, 0x03, 0x33, 0x1E, 0x00}, // U+0063 (c)
+ {0x38, 0x30, 0x30, 0x3e, 0x33, 0x33, 0x6E, 0x00}, // U+0064 (d)
+ {0x00, 0x00, 0x1E, 0x33, 0x3f, 0x03, 0x1E, 0x00}, // U+0065 (e)
+ {0x1C, 0x36, 0x06, 0x0f, 0x06, 0x06, 0x0F, 0x00}, // U+0066 (f)
+ {0x00, 0x00, 0x6E, 0x33, 0x33, 0x3E, 0x30, 0x1F}, // U+0067 (g)
+ {0x07, 0x06, 0x36, 0x6E, 0x66, 0x66, 0x67, 0x00}, // U+0068 (h)
+ {0x0C, 0x00, 0x0E, 0x0C, 0x0C, 0x0C, 0x1E, 0x00}, // U+0069 (i)
+ {0x30, 0x00, 0x30, 0x30, 0x30, 0x33, 0x33, 0x1E}, // U+006A (j)
+ {0x07, 0x06, 0x66, 0x36, 0x1E, 0x36, 0x67, 0x00}, // U+006B (k)
+ {0x0E, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x1E, 0x00}, // U+006C (l)
+ {0x00, 0x00, 0x33, 0x7F, 0x7F, 0x6B, 0x63, 0x00}, // U+006D (m)
+ {0x00, 0x00, 0x1F, 0x33, 0x33, 0x33, 0x33, 0x00}, // U+006E (n)
+ {0x00, 0x00, 0x1E, 0x33, 0x33, 0x33, 0x1E, 0x00}, // U+006F (o)
+ {0x00, 0x00, 0x3B, 0x66, 0x66, 0x3E, 0x06, 0x0F}, // U+0070 (p)
+ {0x00, 0x00, 0x6E, 0x33, 0x33, 0x3E, 0x30, 0x78}, // U+0071 (q)
+ {0x00, 0x00, 0x3B, 0x6E, 0x66, 0x06, 0x0F, 0x00}, // U+0072 (r)
+ {0x00, 0x00, 0x3E, 0x03, 0x1E, 0x30, 0x1F, 0x00}, // U+0073 (s)
+ {0x08, 0x0C, 0x3E, 0x0C, 0x0C, 0x2C, 0x18, 0x00}, // U+0074 (t)
+ {0x00, 0x00, 0x33, 0x33, 0x33, 0x33, 0x6E, 0x00}, // U+0075 (u)
+ {0x00, 0x00, 0x33, 0x33, 0x33, 0x1E, 0x0C, 0x00}, // U+0076 (v)
+ {0x00, 0x00, 0x63, 0x6B, 0x7F, 0x7F, 0x36, 0x00}, // U+0077 (w)
+ {0x00, 0x00, 0x63, 0x36, 0x1C, 0x36, 0x63, 0x00}, // U+0078 (x)
+ {0x00, 0x00, 0x33, 0x33, 0x33, 0x3E, 0x30, 0x1F}, // U+0079 (y)
+ {0x00, 0x00, 0x3F, 0x19, 0x0C, 0x26, 0x3F, 0x00}, // U+007A (z)
+ {0x38, 0x0C, 0x0C, 0x07, 0x0C, 0x0C, 0x38, 0x00}, // U+007B ({)
+ {0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x00}, // U+007C (|)
+ {0x07, 0x0C, 0x0C, 0x38, 0x0C, 0x0C, 0x07, 0x00}, // U+007D (})
+ {0x6E, 0x3B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+007E (~)
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00} // U+007F
+};
+
+#define pokeb(S, O, V) (*(unsigned char *)((S) + (O)) = (V))
+
+// Very temporary
+char *random_string(void) {
+ int fd = open("/dev/urandom", O_RDONLY, 0);
+ char *r = malloc(sizeof(char[10]));
+ for (int i = 0; i < 10 - 1; i++) {
+ char c;
+ read(fd, &c, 1);
+ r[i] = 'a' + (c & 0xF);
+ }
+ close(fd);
+ r[9] = '\0';
+ printf("r: %s\n", r);
+ return r;
+}
+
+int get_bitmap_value(const unsigned char bitmap[], int i) {
+ int array_index = i / 8;
+ int byte_index = i % 8;
+ int rc = (bitmap[array_index] >> byte_index) & 0x1;
+ return rc;
+}
+
+void GUI_OverwriteFont(GUI_Window *w, uint32_t px, uint32_t py,
+ const uint32_t color) {
+ int sx, sy;
+ sx = 8;
+ sy = 8;
+ int x, y;
+ x = px;
+ y = py;
+ if (px + sx > w->sx)
+ return;
+ if (py + sy > w->sy)
+ return;
+ for (int i = 0; i < sx * sy; i++) {
+ int pos = x + y * w->sx;
+ place_pixel_pos(color, pos);
+ x++;
+ if (x >= sx + px) {
+ y++;
+ x = px;
+ }
+ if (y > py + sy)
+ break;
+ }
+}
+
+void GUI_DrawFont(GUI_Window *w, uint32_t px, uint32_t py, const uint32_t c) {
+ int sx, sy;
+ sx = 8;
+ sy = 8;
+ int x, y;
+ x = px;
+ y = py;
+ if (px + sx > w->sx)
+ return;
+ if (py + sy > w->sy)
+ return;
+ const unsigned char *bitmap = font8x8_basic[c];
+ for (int i = 0; i < sx * sy; i++) {
+ int pos = x + y * w->sx;
+ if (get_bitmap_value(bitmap, i)) {
+ place_pixel_pos(0xFFFFFF, pos);
+ } else {
+ place_pixel_pos(0x0, pos);
+ }
+ x++;
+ if (x >= sx + px) {
+ y++;
+ x = px;
+ }
+ if (y > py + sy)
+ break;
+ }
+}
+
+typedef struct {
+ uint16_t px;
+ uint16_t py;
+ uint16_t sx;
+ uint16_t sy;
+ uint8_t name_len;
+} WS_EVENT_CREATE;
+
+void GUI_ClearScreen(GUI_Window *w, uint32_t color) {
+ for (int i = 0; i < w->sx * w->sy; i++)
+ w->bitmap_ptr[i] =color;
+}
+
+GUI_Window *GUI_CreateWindow(uint32_t x, uint32_t y, uint32_t sx, uint32_t sy) {
+ GUI_Window *w = malloc(sizeof(GUI_Window));
+ if (!w)
+ return NULL;
+ w->x = x;
+ w->y = y;
+ w->sx = sx;
+ w->sy = sy;
+
+ // Connect to the windowserver
+ int ws_fd = -1;
+ for (; - 1 == ws_fd;) {
+ ws_fd = open("/dev/windowserver", O_RDWR | O_NONBLOCK, 0);
+ }
+ w->ws_socket = ws_fd;
+ char *str = random_string();
+ WS_EVENT_CREATE e;
+ e.px = x;
+ e.py = y;
+ e.sx = sx;
+ e.sy = sy;
+ e.name_len = (uint8_t)strlen(str) + 1;
+
+ // Create bitmap
+ w->bitmap_fd = shm_open(str, O_RDWR, 0);
+ if (!((int)w->bitmap_fd >= 0)) {
+ printf("bitmap_fd: %x\n", w->bitmap_fd);
+ assert(0);
+ }
+ ftruncate(w->bitmap_fd, sx * sy * sizeof(uint32_t));
+ void *rc = mmap(NULL, sx * sy * sizeof(uint32_t), 0, 0, w->bitmap_fd, 0);
+ if (!((int)rc >= 0)) {
+ printf("rc: %x\n", rc);
+ assert(0);
+ }
+ w->bitmap_ptr = rc;
+
+ // Send the request to the windowserver
+ uint8_t l = 1;
+ uint8_t len = sizeof(l) + sizeof(e) + e.name_len;
+ char *buffer = malloc(len);
+ char *p = buffer;
+ memcpy(p, &l, sizeof(l));
+ p += sizeof(l);
+ memcpy(p, &e, sizeof(e));
+ p += sizeof(e);
+ strcpy(p, str);
+ write(ws_fd, buffer, len);
+ return w;
+}
+
+void GUI_UpdateWindow(GUI_Window *w) {
+ uint8_t l = 0;
+ write(w->ws_socket, &l, sizeof(l));
+}
diff --git a/userland/libgui/libgui.h b/userland/libgui/libgui.h
new file mode 100644
index 0000000..d58c23c
--- /dev/null
+++ b/userland/libgui/libgui.h
@@ -0,0 +1,34 @@
+#ifndef LIBGUI_H
+#define LIBGUI_H
+#include <stddef.h>
+#include <stdint.h>
+
+typedef struct {
+ int ws_socket;
+ int bitmap_fd;
+ uint32_t *bitmap_ptr;
+ int x;
+ int y;
+ int sx;
+ int sy;
+} GUI_Window;
+
+// Taken from drivers/keyboard.c
+struct KEY_EVENT {
+ char c;
+ uint8_t mode; // (shift (0 bit)) (alt (1 bit))
+ uint8_t release; // 0 pressed, 1 released
+};
+
+typedef struct {
+ int type;
+ struct KEY_EVENT ev;
+} WS_EVENT;
+
+GUI_Window *GUI_CreateWindow(uint32_t x, uint32_t y, uint32_t sx, uint32_t sy);
+void GUI_DrawFont(GUI_Window *w, uint32_t px, uint32_t py, const uint32_t c);
+void GUI_UpdateWindow(GUI_Window *w);
+void GUI_OverwriteFont(GUI_Window *w, uint32_t px, uint32_t py,
+ const uint32_t color);
+void GUI_ClearScreen(GUI_Window *w, uint32_t color);
+#endif