Add simple drawing code & font loading.

10 files changed, 467 insertions, 33 deletions

diff --git a/res/fonts/Makefile b/res/fonts/Makefile
index e1daf03..c4de63d 100644
--- a/res/fonts/Makefile
+++ b/res/fonts/Makefile
@@ -1,5 +1,8 @@
+CC=gcc
+CFLAGS=-I../../src/lib/include -std=c11
+
 %.bf: %.c
-	gcc -o $<.bin $<
+	$(CC) $(CFLAGS) -o $<.bin $<
 	./$<.bin > $@
 	rm $<.bin
 
diff --git a/res/fonts/default.c b/res/fonts/default.c
index 374c191..43fddce 100644
--- a/res/fonts/default.c
+++ b/res/fonts/default.c
@@ -1,6 +1,8 @@
 #include <stdlib.h>
 #include <stdio.h>
 
+#include <proto/font_file.h>
+
 char font_data[256][16] = {
 /* 0x00 */	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
 /* 0x01 */	{0x00, 0x00, 0x7e, 0x81, 0xa5, 0x81, 0x81, 0xbd, 0x99, 0x81, 0x81, 0x7e, 0x00, 0x00, 0x00, 0x00},
@@ -260,6 +262,13 @@ char font_data[256][16] = {
 /* 0xff */	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
 };
 
+ascii_bitmap_font_header h = {
+	.magic = ASCII_BITMAP_FONT_MAGIC,
+	.cw = 8,
+	.ch = 16,
+	.nchars = 256,
+};
+
 int main() {
 	FILE *f = fopen("default.bf", "wb");
 	if (f == 0) {
@@ -267,6 +276,7 @@ int main() {
 		exit(1);
 	}
 
+	fwrite(&h, 1, sizeof(h), f);
 	fwrite(font_data, 256, 16, f);
 
 	return 0;
diff --git a/src/common/include/proto/fb.h b/src/common/include/proto/fb.h
index dab9643..710ecb1 100644
--- a/src/common/include/proto/fb.h
+++ b/src/common/include/proto/fb.h
@@ -5,12 +5,14 @@
 #include <stdint.h>
 #include <stddef.h>
 
-#define FB_MM_RGB16		1		// 2 bytes (16 bits) per pixel, blue 0-4, green 5-9, red 10-14
-#define FB_MM_BGR16		2		// 2 bytes (16 bits) per pixel, red 0-4, green 5-9, blue 10-14
-#define FB_MM_RGB24		3		// 3 bytes (24 bits) per pixel, blue 0-7, green 8-15, red 16-23
-#define FB_MM_BGR24		4		// 3 bytes (24 bits) per pixel, red 0-7, green 8-15, blue 16-23
-#define FB_MM_RGB32		5		// 4 bytes (32 bits) per pixel, blue 0-7, green 8-15, red 16-23
-#define FB_MM_BGR32		6		// 4 bytes (32 bits) per pixel, red 0-7, green 8-15, blue 16-23
+#define FB_MM_RGB15		1		// 15 bits per pixel, blue 0-4, green 5-9, red 10-14
+#define FB_MM_BGR15		2		// 15 bits per pixel, red 0-4, green 5-9, blue 10-14
+#define FB_MM_RGB16		3		// 2 bytes (16 bits) per pixel, blue 0-4, green 5-9, red 10-14
+#define FB_MM_BGR16		4		// 2 bytes (16 bits) per pixel, red 0-4, green 5-9, blue 10-14
+#define FB_MM_RGB24		5		// 3 bytes (24 bits) per pixel, blue 0-7, green 8-15, red 16-23
+#define FB_MM_BGR24		6		// 3 bytes (24 bits) per pixel, red 0-7, green 8-15, blue 16-23
+#define FB_MM_RGB32		7		// 4 bytes (32 bits) per pixel, blue 0-7, green 8-15, red 16-23
+#define FB_MM_BGR32		8		// 4 bytes (32 bits) per pixel, red 0-7, green 8-15, blue 16-23
 #define FB_MM_GREY8		10		// 1 byte (8 bits) per pixel greyscale
 
 typedef struct {
diff --git a/src/kernel/dev/vesa.c b/src/kernel/dev/vesa.c
index a039d01..f77b230 100644
--- a/src/kernel/dev/vesa.c
+++ b/src/kernel/dev/vesa.c
@@ -243,9 +243,9 @@ fs_node_ops_t vesa_fs_ops = {
 static struct fb_memory_model {
 	int bpp, rp, gp, bp, rs, gs, bs, mm;
 } fb_memory_models[8] = {
-	{ 15, 10, 5, 0, 5, 5, 5, FB_MM_RGB16 },
+	{ 15, 10, 5, 0, 5, 5, 5, FB_MM_RGB15 },
+	{ 15, 0, 5, 10, 5, 5, 5, FB_MM_BGR15 },
 	{ 16, 10, 5, 0, 5, 5, 5, FB_MM_RGB16 },
-	{ 15, 0, 5, 10, 5, 5, 5, FB_MM_BGR16 },
 	{ 16, 0, 5, 10, 5, 5, 5, FB_MM_BGR16 },
 	{ 24, 16, 8, 0, 8, 8, 8, FB_MM_RGB24 },
 	{ 24, 0, 8, 16, 8, 8, 8, FB_MM_BGR24 },
@@ -443,12 +443,29 @@ void vesa_clear(vesa_driver_t *d) {
 
 	int tly = (mode->info.height / 2) - (kogata_logo.height / 2);
 	int tlx = (mode->info.width / 2) - (kogata_logo.width / 2);
-	int mbpp = (mode->info.bpp / 8);
 
-	for (unsigned l = 0; l < kogata_logo.height; l++) {
-		memcpy(region + (tly + l) * mode->info.pitch + tlx * mbpp,
-			buffer + kogata_logo.width * l * kogata_logo.bytes_per_pixel,
-			kogata_logo.width * kogata_logo.bytes_per_pixel);
+	if (mode->info.bpp == 24) {
+		for (unsigned l = 0; l < kogata_logo.height; l++) {
+			memcpy(region + (tly + l) * mode->info.pitch + tlx * 3,
+				buffer + kogata_logo.width * l * kogata_logo.bytes_per_pixel,
+				kogata_logo.width * kogata_logo.bytes_per_pixel);
+		}
+	} else if (mode->info.bpp == 32) {
+		for (unsigned l = 0; l < kogata_logo.height; l++) {
+			uint32_t *p = (uint32_t*)(region + (tly + l) * mode->info.pitch + tlx * 4);
+			uint8_t *r = (uint8_t*)(buffer + kogata_logo.width * l * kogata_logo.bytes_per_pixel);
+			for (unsigned c = 0; c < kogata_logo.width; c++) {
+				p[c] = r[3*c] | (r[3*c+1] << 8) | (r[3*c+2] <<16);
+			}
+		}
+	} else if (mode->info.bpp == 15 || mode->info.bpp == 16) {
+		for (unsigned l = 0; l < kogata_logo.height; l++) {
+			uint16_t *p = (uint16_t*)(region + (tly + l) * mode->info.pitch + tlx * 2);
+			uint8_t *r = (uint8_t*)(buffer + kogata_logo.width * l * kogata_logo.bytes_per_pixel);
+			for (unsigned c = 0; c < kogata_logo.width; c++) {
+				p[c] = (r[3*c]/8) | ((r[3*c+1]/8) << 5) | ((r[3*c+2]/8) <<10);
+			}
+		}
 	}
 
 end:
diff --git a/src/lib/include/draw.h b/src/lib/include/draw.h
new file mode 100644
index 0000000..893c5a3
--- /dev/null
+++ b/src/lib/include/draw.h
@@ -0,0 +1,62 @@
+#pragma once
+
+#include <syscall.h>
+#include <proto/fb.h>
+
+//  ---- Generic drawing functions
+
+//  ---- Data structures
+
+typedef struct {
+	fb_info_t geom;
+
+	fd_t fd;
+	uint8_t* data;
+} fb_t;
+
+typedef struct font font_t;
+
+typedef uint32_t color_t;	// a color is always linked to a FB on which it is to be applied
+
+//  ---- Buffer creation
+
+fb_t *g_fb_from_file(fd_t file, fb_info_t *geom);
+fb_t *g_fb_from_mem(uint8_t* region, fb_info_t *geom);
+
+void g_delete_fb(fb_t *fb);
+
+//  ---- Color manipulation
+
+color_t g_color_rgb(fb_t *f, uint8_t r, uint8_t g, uint8_t b);
+
+//  ---- Drawing primitives
+
+void g_plot(fb_t *fb, int x, int y, color_t c);
+
+void g_hline(fb_t *fb, int x, int y, int w, color_t c);		// horizontal line
+void g_vline(fb_t *fb, int x, int y, int h, color_t c);		// vertical line
+void g_line(fb_t *fb, int x1, int y1, int x2, int y2, color_t c);
+
+void g_rect(fb_t *fb, int x, int y, int w, int h, color_t c);
+void g_fillrect(fb_t *fb, int x, int y, int w, int h, color_t c);
+void g_rect_r(fb_t *fb, fb_region_t reg, color_t c);
+void g_fillrect_r(fb_t *fb, fb_region_t reg, color_t c);
+
+void g_circle(fb_t *fb, int cx, int cy, int r, color_t c);
+void g_fillcircle(fb_t *fb, int cx, int cy, int r, color_t c);
+
+void g_blit(fb_t *dst, int x, int y, fb_t *src);
+void g_blit_region(fb_t *dst, int x, int y, fb_t *src, fb_region_t reg);
+
+//  ---- Text manipulation
+
+font_t *g_load_font(const char* fontname);
+void g_free_font(font_t *f);
+
+int g_text_width(font_t *f, const char* text);
+int g_text_height(font_t *f, const char* text);
+
+void g_write(fb_t *fb, int x, int y, const char* text, font_t *font, color_t c);
+
+
+/* vim: set ts=4 sw=4 tw=0 noet :*/
diff --git a/src/lib/include/proto/font_file.h b/src/lib/include/proto/font_file.h
new file mode 100644
index 0000000..e57c0ab
--- /dev/null
+++ b/src/lib/include/proto/font_file.h
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <stdint.h>
+#include <stddef.h>
+
+#define ASCII_BITMAP_FONT_MAGIC 0xD184C274
+
+typedef struct {
+	uint32_t magic;
+	uint16_t cw, ch;
+	uint32_t nchars;
+} ascii_bitmap_font_header;
+
+/* vim: set ts=4 sw=4 tw=0 noet :*/
diff --git a/src/lib/libkogata/Makefile b/src/lib/libkogata/Makefile
index 48c6bc2..a8df419 100644
--- a/src/lib/libkogata/Makefile
+++ b/src/lib/libkogata/Makefile
@@ -1,5 +1,5 @@
 OBJ = start.o malloc.o debug.o syscall.o user_region.o \
-	mainloop.o gip.o
+	mainloop.o gip.o draw.o
 
 LIB = ../../common/libkogata/libkogata.lib ../../common/libalgo/libalgo.lib ../../common/libc/libc.lib
 
diff --git a/src/lib/libkogata/draw.c b/src/lib/libkogata/draw.c
new file mode 100644
index 0000000..22ad8ba
--- /dev/null
+++ b/src/lib/libkogata/draw.c
@@ -0,0 +1,317 @@
+#include <syscall.h>
+#include <malloc.h>
+#include <string.h>
+#include <printf.h>
+
+#include <proto/font_file.h>
+
+#include <user_region.h>
+
+#include <draw.h>
+
+fb_t *g_fb_from_file(fd_t file, fb_info_t *geom) {
+	fb_t *ret = (fb_t*)malloc(sizeof(fb_t));
+	if (ret == 0) return 0;
+
+	memcpy(&ret->geom, geom, sizeof(fb_info_t));
+	ret->fd = file;
+
+	ret->data = (uint8_t*)region_alloc(geom->height * geom->pitch, "Framebuffer");
+	if (ret->data == 0) goto error;
+
+	bool map_ok = mmap_file(file, 0, ret->data, geom->height * geom->pitch, MM_READ | MM_WRITE);
+	if (!map_ok) goto error;
+
+	return ret;
+
+error:
+	if (ret && ret->data) region_free(ret->data);
+	if (ret) free(ret);
+	return 0;
+}
+
+fb_t *g_fb_from_mem(uint8_t* data, fb_info_t *geom) {
+	fb_t *ret = (fb_t*)malloc(sizeof(fb_t));
+	if (ret == 0) return 0;
+
+	memcpy(&ret->geom, geom, sizeof(fb_info_t));
+	ret->fd = 0;
+	ret->data = data;
+
+	return ret;
+}
+
+void g_delete_fb(fb_t *fb) {
+	if (fb->fd != 0) {
+		munmap(fb->data);
+		region_free(fb->data);
+	}
+	free(fb);
+}
+
+//  ---- Color management
+
+color_t g_color_rgb(fb_t *f, uint8_t r, uint8_t g, uint8_t b) {
+	int m = f->geom.memory_model;
+	if (m == FB_MM_RGB24 || m == FB_MM_RGB32) return (r << 16) | (g << 8) | b;
+	if (m == FB_MM_BGR24 || m == FB_MM_BGR32) return (b << 16) | (g << 8) | r;
+	if (m == FB_MM_GREY8) return ((r + g + b) / 3) & 0xFF;
+	if (m == FB_MM_RGB16 || m == FB_MM_RGB15) return ((r >> 3) << 10) | ((g >> 3) << 5) | (b >> 3);
+	if (m == FB_MM_BGR16 || m == FB_MM_BGR15) return ((b >> 3) << 10) | ((g >> 3) << 5) | (r >> 3);
+	return 0;	// unknown?
+}
+
+//  ---- Plot
+
+inline void g_plot24(uint8_t* p, color_t c) {
+	p[0] = c & 0xFF;
+	p[1] = (c >> 8) & 0xFF;
+	p[2] = (c >> 16) & 0xFF;
+}
+
+void g_plot(fb_t *fb, int x, int y, color_t c) {
+	if (fb->geom.bpp == 8) {
+		fb->data[y * fb->geom.pitch + x] = (c & 0xFF);
+	} else if (fb->geom.bpp == 15 || fb->geom.bpp == 16) {
+		uint16_t *p = (uint16_t*)(fb->data + y * fb->geom.pitch + 2 * x);
+		*p = (c & 0xFFFF);
+	} else if (fb->geom.bpp == 24) {
+		g_plot24(fb->data + y * fb->geom.pitch + 3 * x, c);
+	} else if (fb->geom.bpp == 32) {
+		uint32_t *p = (uint32_t*)(fb->data + y * fb->geom.pitch + 4 * x);
+		*p = c;
+	}
+}
+
+void g_hline(fb_t *fb, int x, int y, int w, color_t c) {
+	if (fb->geom.bpp == 8) {
+		for (int u = x; u < x + w; u++) {
+			fb->data[y * fb->geom.pitch + u] = (c & 0xFF);
+		}
+	} else if (fb->geom.bpp == 15 || fb->geom.bpp == 15) {
+		for (int u = x; u < x + w; u++) {
+			uint16_t *p = (uint16_t*)(fb->data + y * fb->geom.pitch + 2 * u);
+			*p = (c & 0xFFFF);
+		}
+	} else if (fb->geom.bpp == 24) {
+		for (int u = x; u < x + w; u++) {
+			g_plot24(fb->data + y * fb->geom.pitch + 3 * u, c);
+		}
+	} else if (fb->geom.bpp == 32) {
+		for (int u = x; u < x + w; u++) {
+			uint32_t *p = (uint32_t*)(fb->data + y * fb->geom.pitch + 4 * u);
+			*p = c;
+		}
+	}
+}
+
+void g_vline(fb_t *fb, int x, int y, int h, color_t c) {
+	if (fb->geom.bpp == 8) {
+		for (int v = y; v < y + h; v++) {
+			fb->data[v * fb->geom.pitch + x] = (c & 0xFF);
+		}
+	} else if (fb->geom.bpp == 15 || fb->geom.bpp == 15) {
+		for (int v = y; v < y + h; v++) {
+			uint16_t *p = (uint16_t*)(fb->data + v * fb->geom.pitch + 2 * x);
+			*p = (c & 0xFFFF);
+		}
+	} else if (fb->geom.bpp == 24) {
+		for (int v = y; v < y + h; v++) {
+			g_plot24(fb->data + v * fb->geom.pitch + 3 * x, c);
+		}
+	} else if (fb->geom.bpp == 32) {
+		for (int v = y; v < y + h; v++) {
+			uint32_t *p = (uint32_t*)(fb->data + v * fb->geom.pitch + 4 * x);
+			*p = c;
+		}
+	}
+}
+
+void g_line(fb_t *fb, int x1, int y1, int x2, int y2, color_t c) {
+	// TODO
+}
+
+void g_rect(fb_t *fb, int x, int y, int w, int h, color_t c) {
+	g_hline(fb, x, y, w, c);
+	g_hline(fb, x, y+h-1, w, c);
+	g_vline(fb, x, y, h, c);
+	g_vline(fb, x+w-1, y, h, c);
+}
+
+void g_fillrect(fb_t *fb, int x, int y, int w, int h, color_t c) {
+	if (fb->geom.bpp == 8) {
+		for (int v = y; v < y + h; v++) {
+			for (int u = x; u < x + w; u++) {
+				fb->data[v * fb->geom.pitch + u] = (c & 0xFF);
+			}
+		}
+	} else if (fb->geom.bpp == 15 || fb->geom.bpp == 15) {
+		for (int v = y; v < y + h; v++) {
+			for (int u = x; u < x + w; u++) {
+				uint16_t *p = (uint16_t*)(fb->data + v * fb->geom.pitch + 2 * u);
+				*p = (c & 0xFFFF);
+			}
+		}
+	} else if (fb->geom.bpp == 24) {
+		for (int v = y; v < y + h; v++) {
+			for (int u = x; u < x + w; u++) {
+				g_plot24(fb->data + v * fb->geom.pitch + 3 * u, c);
+			}
+		}
+	} else if (fb->geom.bpp == 32) {
+		for (int v = y; v < y + h; v++) {
+			for (int u = x; u < x + w; u++) {
+				uint32_t *p = (uint32_t*)(fb->data + v * fb->geom.pitch + 4 * u);
+				*p = c;
+			}
+		}
+	}
+}
+
+void g_rect_r(fb_t *fb, fb_region_t reg, color_t c) {
+	g_rect(fb, reg.x, reg.y, reg.w, reg.h, c);
+}
+
+void g_fillrect_r(fb_t *fb, fb_region_t reg, color_t c) {
+	g_fillrect(fb, reg.x, reg.y, reg.w, reg.h, c);
+}
+
+void g_circle(fb_t *fb, int cx, int cy, int r, color_t c) {
+	// TODO
+}
+
+void g_fillcircle(fb_t *fb, int cx, int cy, int r, color_t c) {
+	// TODO
+}
+
+void g_blit(fb_t *dst, int x, int y, fb_t *src) {
+	fb_region_t r;
+
+	r.x = 0;
+	r.y = 0;
+	r.w = src->geom.width;
+	r.h = src->geom.height;
+
+	g_blit_region(dst, x, y, src, r);
+}
+
+void g_blit_region(fb_t *dst, int x, int y, fb_t *src, fb_region_t reg) {
+	if (src->geom.memory_model == dst->geom.memory_model) {
+		for (uint32_t i = 0; i < reg.h; i++) {
+			memcpy(
+				dst->data + (y + i) * dst->geom.pitch + x * (dst->geom.bpp / 8),
+				src->data + (reg.y + i) * src->geom.pitch + reg.x * (src->geom.bpp / 8),
+				reg.w * (src->geom.bpp / 8));
+		}
+	} else {
+		dbg_printf("Unsupported blit between different memory models.\n");
+	}
+}
+
+//  ---- Text manipulation
+
+#define FONT_ASCII_BITMAP	1
+// more font types to come
+
+typedef struct font {
+	int type;
+	union {
+		struct {
+			uint8_t* data;
+			uint8_t cw, ch;		// width, height of a character
+			uint32_t nchars;
+		} ascii_bitmap;
+	};
+} font_t;
+
+font_t *g_load_ascii_bitmap_font(fd_t f) {
+	font_t *font = 0;
+
+	ascii_bitmap_font_header h;
+
+	size_t s = read(f, 0, sizeof(h), (char*)&h);
+	if (s != sizeof(h)) goto error;
+
+	if (h.magic != ASCII_BITMAP_FONT_MAGIC) goto error;
+	if (h.cw != 8) goto error;
+
+	font = malloc(sizeof(font_t));
+	if (font == 0) goto error;
+	memset(font, 0, sizeof(font_t));
+
+
+	font->type = FONT_ASCII_BITMAP;
+	font->ascii_bitmap.cw = h.cw;
+	font->ascii_bitmap.ch = h.ch;
+	font->ascii_bitmap.nchars = h.nchars;
+
+
+	font->ascii_bitmap.data = (uint8_t*)malloc(h.ch * h.nchars);
+	if (font->ascii_bitmap.data == 0) goto error;
+
+	size_t rd = read(f, sizeof(h), h.ch * h.nchars, (char*)font->ascii_bitmap.data);
+	if (rd != h.ch * h.nchars) goto error;
+
+	return font;
+
+error:
+	if (font && font->ascii_bitmap.data) free(font->ascii_bitmap.data);
+	if (font) free(font);
+	close(f);
+	return 0;
+}
+
+font_t *g_load_font(const char* fontname) {
+	char buf[128];
+
+	snprintf(buf, 128, "sys:/fonts/%s.bf", fontname);
+	fd_t f = open(buf, FM_READ);
+	if (f != 0) return g_load_ascii_bitmap_font(f);
+
+	return 0;
+}
+
+void g_free_font(font_t *f) {
+	if (f->type == FONT_ASCII_BITMAP) {
+		free(f->ascii_bitmap.data);
+	}
+
+	free(f);
+}
+
+int g_text_width(font_t *font, const char* text) {
+	if (font->type == FONT_ASCII_BITMAP) {
+		return font->ascii_bitmap.cw * strlen(text);
+	}
+	return 0;
+}
+
+int g_text_height(font_t *font, const char* text) {
+	if (font->type == FONT_ASCII_BITMAP) {
+		return font->ascii_bitmap.ch;
+	}
+	return 0;
+}
+
+void g_write(fb_t *fb, int x, int y, const char* text, font_t *font, color_t c) {
+	if (font->type == FONT_ASCII_BITMAP) {
+		while (*text != 0) {
+			uint8_t id = (uint8_t)*text;
+			if (id < font->ascii_bitmap.nchars) {
+				uint8_t *d = font->ascii_bitmap.data + (id * font->ascii_bitmap.ch);
+				for (int r = 0; r < font->ascii_bitmap.ch; r++) {
+					for (int j = 0; j < 8; j++) {
+						if (d[r] & (0x80 >> j)) {
+							g_plot(fb, x + j, y + r, c);
+						}
+					}
+				}
+			}
+			text++;
+			x += font->ascii_bitmap.cw;
+		}
+	}
+}
+
+
+/* vim: set ts=4 sw=4 tw=0 noet :*/
diff --git a/src/sysbin/giosrv/main.c b/src/sysbin/giosrv/main.c
index fcb9360..b38d1c7 100644
--- a/src/sysbin/giosrv/main.c
+++ b/src/sysbin/giosrv/main.c
@@ -103,14 +103,17 @@ void disable_features(gip_handler_t *h, gip_msg_header *p) {
 
 void query_mode(gip_handler_t *h, gip_msg_header *p) {
 	// TODO
+	gip_reply_fail(h, p);
 }
 
 void set_mode(gip_handler_t *h, gip_msg_header *p) {
 	// TODO
+	gip_reply_fail(h, p);
 }
 
 void unknown_msg(gip_handler_t *h, gip_msg_header *p) {
 	// TODO
+	gip_reply_fail(h, p);
 }
 
 void fd_error(gip_handler_t *h) {
diff --git a/src/sysbin/login/main.c b/src/sysbin/login/main.c
index eac19e7..294ad76 100644
--- a/src/sysbin/login/main.c
+++ b/src/sysbin/login/main.c
@@ -4,14 +4,12 @@
 #include <debug.h>
 
 #include <gip.h>
+#include <draw.h>
 
 typedef struct {
 	fb_info_t mode;
-
-	size_t fb_size;
-	void* map;
-
 	fd_t fd;
+	fb_t *fb;
 
 	uint32_t sv_features, cl_features;
 } loginc_t;
@@ -63,10 +61,13 @@ void c_buffer_info(gip_handler_t *s, gip_msg_header *p, gip_buffer_info_msg *m)
 
 	loginc_t *c = (loginc_t*)s->data;
 
-	if (c->fd != 0) close(c->fd);
-	if (c->map != 0) {
-		munmap(c->map);
-		region_free(c->map);
+	if (c->fb != 0) {
+		g_delete_fb(c->fb);
+		c->fb = 0;
+	}
+	if (c->fd != 0) {
+		close(c->fd);
+		c->fd = 0;
 	}
 
 	c->fd = use_token(&m->tok);
@@ -76,19 +77,24 @@ void c_buffer_info(gip_handler_t *s, gip_msg_header *p, gip_buffer_info_msg *m)
 		dbg_printf("[login] Got buffer on FD %d, %dx%dx%d\n",
 			c->fd, c->mode.width, c->mode.height, c->mode.bpp);
 
-		c->fb_size = c->mode.pitch * c->mode.height;
-
-		c->map = region_alloc(c->fb_size, "Framebuffer");
-		if (c->map != 0) {
-			bool ok = mmap_file(c->fd, 0, c->map, c->fb_size, MM_READ | MM_WRITE);
-			if (ok) {
-				memset(c->map, 0, c->fb_size);
+		c->fb = g_fb_from_file(c->fd, &m->geom);
+		if (c->fb != 0) {
+			color_t black = g_color_rgb(c->fb, 0, 0, 0);
+			color_t grey = g_color_rgb(c->fb, 128, 128, 128);
+			g_fillrect(c->fb, 0, 0, m->geom.width, m->geom.height, black);
+			g_fillrect(c->fb, 50, 50, 50, 50, grey);
+
+			font_t *f = g_load_font("default");
+			if (f != 0) {
+				g_write(c->fb, 50, 100, "Hello, world!", f, grey);
+				g_free_font(f);
 			} else {
-				dbg_printf("[login] Could not mmap buffer.\n");
-				region_free(c->map);
-				c->map = 0;
+				dbg_printf("Could not load font 'default'\n");
 			}
+		} else {
+			dbg_printf("Could not open framebuffer file %d\n", c->fd);
 		}
+
 	}
 }