Changeset 7c014d1 in mainline for uspace/srv/hid/fb/fb.c

Timestamp:

2011-09-09T15:46:21Z (13 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

c69646f8

Parents:

14a60e3

Message:

console and framebuffer server rewrite

File:

• uspace/srv/hid/fb/fb.c (modified) (2 diffs)

uspace/srv/hid/fb/fb.c

@@ -1 +1 @@
 /*
- * Copyright (c) 2008 Martin Decky
- * Copyright (c) 2006 Jakub Vana
- * Copyright (c) 2006 Ondrej Palkovsky
+ * Copyright (c) 2011 Martin Decky
  * All rights reserved.
  *
@@ -29 +27 @@
  */
 
-/**
- * @defgroup fb Graphical framebuffer
- * @brief HelenOS graphical framebuffer.
- * @ingroup fbs
- * @{
- */
-
-/** @file
- */
-
-#include <stdlib.h>
-#include <unistd.h>
-#include <str.h>
-#include <ddi.h>
-#include <sysinfo.h>
-#include <align.h>
+#include <sys/types.h>
+#include <bool.h>
+#include <loc.h>
+#include <errno.h>
+#include <stdio.h>
+#include <malloc.h>
+#include <inttypes.h>
 #include <as.h>
-#include <ipc/fb.h>
-#include <ipc/ns.h>
-#include <ipc/services.h>
-#include <errno.h>
-#include <abi/fb/visuals.h>
-#include <io/color.h>
-#include <io/style.h>
-#include <async.h>
-#include <fibril.h>
-#include <bool.h>
-#include <stdio.h>
-#include <byteorder.h>
-#include <io/screenbuffer.h>
-#include <imgmap.h>
-#include "font-8x16.h"
+#include <fb.h>
+#include <screenbuffer.h>
+#include "port/ega.h"
+#include "port/kchar.h"
+#include "port/kfb.h"
+#include "port/niagara.h"
+#include "port/ski.h"
 #include "fb.h"
-#include "main.h"
-#include "pointer.xbm"
-#include "pointer_mask.xbm"
-
-// FIXME: remove this header
-#include <abi/ipc/methods.h>
-
-#define DEFAULT_BGCOLOR  0xf0f0f0
-#define DEFAULT_FGCOLOR  0x000000
-
-#define GLYPH_UNAVAIL  '?'
-
-#define MAX_ANIM_LEN    8
-#define MAX_ANIMATIONS  4
-#define MAX_IMGMAPS     256  /**< Maximum number of saved image maps */
-#define MAX_VIEWPORTS   128  /**< Viewport is a rectangular area on the screen */
-
-/** Function to render a pixel from a RGB value. */
-typedef void (*rgb_conv_t)(void *, uint32_t);
-
-/** Function to render a bit mask. */
-typedef void (*mask_conv_t)(void *, bool);
-
-/** Function to draw a glyph. */
-typedef void (*dg_t)(unsigned int x, unsigned int y, bool cursor,
-    uint8_t *glyphs, uint32_t glyph, uint32_t fg_color, uint32_t bg_color);
-
-struct {
-        uint8_t *fb_addr;
-        
-        unsigned int xres;
-        unsigned int yres;
-        
-        unsigned int scanline;
-        unsigned int glyphscanline;
-        
-        unsigned int pixelbytes;
-        unsigned int glyphbytes;
-        
-        /** Pre-rendered mask for rendering glyphs. Specific for the visual. */
-        uint8_t *glyphs;
-        
-        rgb_conv_t rgb_conv;
-        mask_conv_t mask_conv;
-} screen;
-
-/** Backbuffer character cell. */
-typedef struct {
-        uint32_t glyph;
-        uint32_t fg_color;
-        uint32_t bg_color;
-} bb_cell_t;
-
-typedef struct {
-        bool initialized;
-        unsigned int x;
-        unsigned int y;
-        unsigned int width;
-        unsigned int height;
-        
-        /* Text support in window */
-        unsigned int cols;
-        unsigned int rows;
+
+#define NAME       "fb"
+#define NAMESPACE  "hid"
+
+#define TICK_INTERVAL  250000
+
+static LIST_INITIALIZE(fbdevs);
+
+fbdev_t *fbdev_register(fbdev_ops_t *ops, void *data)
+{
+        sysarg_t index = 0;
+        
+        if (!list_empty(&fbdevs)) {
+                list_foreach(fbdevs, link) {
+                        fbdev_t *dev = list_get_instance(link, fbdev_t, link);
+                        if (index <= dev->index)
+                                index = dev->index + 1;
+                }
+        }
+        
+        fbdev_t *dev = (fbdev_t *) malloc(sizeof(fbdev_t));
+        if (dev == NULL)
+                return NULL;
+        
+        link_initialize(&dev->link);
+        atomic_set(&dev->refcnt, 0);
+        dev->claimed = false;
+        dev->index = index;
+        list_initialize(&dev->vps);
+        list_initialize(&dev->frontbufs);
+        list_initialize(&dev->imagemaps);
+        list_initialize(&dev->sequences);
+        
+        dev->ops = *ops;
+        dev->data = data;
+        
+        char node[LOC_NAME_MAXLEN + 1];
+        snprintf(node, LOC_NAME_MAXLEN, "%s/%s%" PRIun, NAMESPACE, NAME,
+            index);
+        
+        if (loc_service_register(node, &dev->dsid) != EOK) {
+                printf("%s: Unable to register device %s\n", NAME, node);
+                free(dev);
+                return NULL;
+        }
+        
+        list_append(&dev->link, &fbdevs);
+        return dev;
+}
+
+static void fbsrv_yield(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        assert(dev->ops.yield);
+        
+        if (dev->claimed) {
+                int rc = dev->ops.yield(dev);
+                if (rc == EOK)
+                        dev->claimed = false;
+                
+                async_answer_0(iid, rc);
+        } else
+                async_answer_0(iid, ENOENT);
+}
+
+static void fbsrv_claim(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        assert(dev->ops.claim);
+        
+        if (!dev->claimed) {
+                int rc = dev->ops.claim(dev);
+                if (rc == EOK)
+                        dev->claimed = true;
+                
+                async_answer_0(iid, rc);
+        } else
+                async_answer_0(iid, ENOENT);
+}
+
+static void fbsrv_get_resolution(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        assert(dev->ops.get_resolution);
+        
+        sysarg_t width;
+        sysarg_t height;
+        int rc = dev->ops.get_resolution(dev, &width, &height);
+        
+        async_answer_2(iid, rc, width, height);
+}
+
+static void fbsrv_pointer_update(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        if ((dev->claimed) && (dev->ops.pointer_update)) {
+                dev->ops.pointer_update(dev, IPC_GET_ARG1(*icall),
+                    IPC_GET_ARG2(*icall), IPC_GET_ARG3(*icall));
+                async_answer_0(iid, EOK);
+        } else
+                async_answer_0(iid, ENOTSUP);
+}
+
+static fbvp_t *resolve_vp(fbdev_t *dev, sysarg_t handle, ipc_callid_t iid)
+{
+        fbvp_t *vp = NULL;
+        list_foreach(dev->vps, link) {
+                fbvp_t *cur = list_get_instance(link, fbvp_t, link);
+                if (cur == (fbvp_t *) handle) {
+                        vp = cur;
+                        break;
+                }
+        }
+        
+        if (vp == NULL) {
+                async_answer_0(iid, ENOENT);
+                return NULL;
+        }
+        
+        return vp;
+}
+
+static frontbuf_t *resolve_frontbuf(fbdev_t *dev, sysarg_t handle, ipc_callid_t iid)
+{
+        frontbuf_t *frontbuf = NULL;
+        list_foreach(dev->frontbufs, link) {
+                frontbuf_t *cur = list_get_instance(link, frontbuf_t, link);
+                if (cur == (frontbuf_t *) handle) {
+                        frontbuf = cur;
+                        break;
+                }
+        }
+        
+        if (frontbuf == NULL) {
+                async_answer_0(iid, ENOENT);
+                return NULL;
+        }
+        
+        return frontbuf;
+}
+
+static imagemap_t *resolve_imagemap(fbdev_t *dev, sysarg_t handle, ipc_callid_t iid)
+{
+        imagemap_t *imagemap = NULL;
+        list_foreach(dev->imagemaps, link) {
+                imagemap_t *cur = list_get_instance(link, imagemap_t, link);
+                if (cur == (imagemap_t *) handle) {
+                        imagemap = cur;
+                        break;
+                }
+        }
+        
+        if (imagemap == NULL) {
+                async_answer_0(iid, ENOENT);
+                return NULL;
+        }
+        
+        return imagemap;
+}
+
+static sequence_t *resolve_sequence(fbdev_t *dev, sysarg_t handle, ipc_callid_t iid)
+{
+        sequence_t *sequence = NULL;
+        list_foreach(dev->sequences, link) {
+                sequence_t *cur = list_get_instance(link, sequence_t, link);
+                if (cur == (sequence_t *) handle) {
+                        sequence = cur;
+                        break;
+                }
+        }
+        
+        if (sequence == NULL) {
+                async_answer_0(iid, ENOENT);
+                return NULL;
+        }
+        
+        return sequence;
+}
+
+static void fbsrv_vp_create(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        assert(dev->ops.font_metrics);
+        assert(dev->ops.vp_create);
+        
+        fbvp_t *vp = (fbvp_t *) malloc(sizeof(fbvp_t));
+        if (vp == NULL) {
+                async_answer_0(iid, ENOMEM);
+                return;
+        }
+        
+        link_initialize(&vp->link);
+        
+        vp->x = IPC_GET_ARG1(*icall);
+        vp->y = IPC_GET_ARG2(*icall);
+        vp->width = IPC_GET_ARG3(*icall);
+        vp->height = IPC_GET_ARG4(*icall);
+        
+        dev->ops.font_metrics(dev, vp->width, vp->height, &vp->cols, &vp->rows);
+        
+        vp->cursor_active = false;
+        vp->cursor_flash = false;
+        
+        list_initialize(&vp->sequences);
+        
+        vp->backbuf = screenbuffer_create(vp->cols, vp->rows,
+            SCREENBUFFER_FLAG_NONE);
+        if (vp->backbuf == NULL) {
+                free(vp);
+                async_answer_0(iid, ENOMEM);
+                return;
+        }
+        
+        vp->top_row = 0;
+        
+        int rc = dev->ops.vp_create(dev, vp);
+        if (rc != EOK) {
+                free(vp);
+                async_answer_0(iid, ENOMEM);
+                return;
+        }
+        
+        list_append(&vp->link, &dev->vps);
+        async_answer_1(iid, EOK, (sysarg_t) vp);
+}
+
+static void fbsrv_vp_destroy(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        assert(dev->ops.vp_destroy);
+        
+        fbvp_t *vp = resolve_vp(dev, IPC_GET_ARG1(*icall), iid);
+        if (vp == NULL)
+                return;
+        
+        if (dev->active_vp == vp) {
+                async_answer_0(iid, EPERM);
+                return;
+        }
+        
+        dev->ops.vp_destroy(dev, vp);
+        
+        list_remove(&vp->link);
+        free(vp->backbuf);
+        free(vp);
+        
+        async_answer_0(iid, EOK);
+}
+
+static void fbsrv_frontbuf_create(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        frontbuf_t *frontbuf = (frontbuf_t *) malloc(sizeof(frontbuf_t));
+        if (frontbuf == NULL) {
+                async_answer_0(iid, ENOMEM);
+                return;
+        }
+        
+        link_initialize(&frontbuf->link);
+        
+        ipc_callid_t callid;
+        if (!async_share_out_receive(&callid, &frontbuf->size,
+            &frontbuf->flags)) {
+                free(frontbuf);
+                async_answer_0(iid, EINVAL);
+                return;
+        }
+        
+        frontbuf->data = as_get_mappable_page(frontbuf->size);
+        int rc = async_answer_1(callid, EOK, (sysarg_t) frontbuf->data);
+        if (rc != EOK) {
+                free(frontbuf);
+                async_answer_0(iid, ENOMEM);
+                return;
+        }
+        
+        list_append(&frontbuf->link, &dev->frontbufs);
+        async_answer_1(iid, EOK, (sysarg_t) frontbuf);
+}
+
+static void fbsrv_frontbuf_destroy(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        frontbuf_t *frontbuf = resolve_frontbuf(dev, IPC_GET_ARG1(*icall), iid);
+        if (frontbuf == NULL)
+                return;
+        
+        list_remove(&frontbuf->link);
+        as_area_destroy(frontbuf->data);
+        free(frontbuf);
+        
+        async_answer_0(iid, EOK);
+}
+
+static void fbsrv_imagemap_create(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        imagemap_t *imagemap = (imagemap_t *) malloc(sizeof(imagemap_t));
+        if (imagemap == NULL) {
+                async_answer_0(iid, ENOMEM);
+                return;
+        }
+        
+        link_initialize(&imagemap->link);
+        link_initialize(&imagemap->seq_link);
+        
+        ipc_callid_t callid;
+        if (!async_share_out_receive(&callid, &imagemap->size,
+            &imagemap->flags)) {
+                free(imagemap);
+                async_answer_0(iid, EINVAL);
+                return;
+        }
+        
+        imagemap->data = as_get_mappable_page(imagemap->size);
+        int rc = async_answer_1(callid, EOK, (sysarg_t) imagemap->data);
+        if (rc != EOK) {
+                free(imagemap);
+                async_answer_0(iid, ENOMEM);
+                return;
+        }
+        
+        list_append(&imagemap->link, &dev->imagemaps);
+        async_answer_1(iid, EOK, (sysarg_t) imagemap);
+}
+
+static void fbsrv_imagemap_destroy(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        imagemap_t *imagemap = resolve_imagemap(dev, IPC_GET_ARG1(*icall), iid);
+        if (imagemap == NULL)
+                return;
+        
+        list_remove(&imagemap->link);
+        list_remove(&imagemap->seq_link);
+        as_area_destroy(imagemap->data);
+        free(imagemap);
+        
+        async_answer_0(iid, EOK);
+}
+
+static void fbsrv_sequence_create(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        sequence_t *sequence = (sequence_t *) malloc(sizeof(sequence_t));
+        if (sequence == NULL) {
+                async_answer_0(iid, ENOMEM);
+                return;
+        }
+        
+        link_initialize(&sequence->link);
+        list_initialize(&sequence->imagemaps);
+        sequence->count = 0;
+        
+        list_append(&sequence->link, &dev->sequences);
+        async_answer_1(iid, EOK, (sysarg_t) sequence);
+}
+
+static void fbsrv_sequence_destroy(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        sequence_t *sequence = resolve_sequence(dev, IPC_GET_ARG1(*icall), iid);
+        if (sequence == NULL)
+                return;
+        
+        list_remove(&sequence->link);
+        free(sequence);
+        
+        async_answer_0(iid, EOK);
+}
+
+static void fbsrv_sequence_add_imagemap(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        sequence_t *sequence = resolve_sequence(dev, IPC_GET_ARG1(*icall), iid);
+        if (sequence == NULL)
+                return;
+        
+        imagemap_t *imagemap = resolve_imagemap(dev, IPC_GET_ARG2(*icall), iid);
+        if (imagemap == NULL)
+                return;
+        
+        if (list_member(&imagemap->seq_link, &sequence->imagemaps)) {
+                async_answer_0(iid, EEXISTS);
+                return;
+        }
+        
+        list_append(&imagemap->seq_link, &sequence->imagemaps);
+        sequence->count++;
+        
+        async_answer_0(iid, EOK);
+}
+
+static void fbsrv_vp_focus(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        fbvp_t *vp = resolve_vp(dev, IPC_GET_ARG1(*icall), iid);
+        if (vp == NULL)
+                return;
+        
+        if (dev->active_vp != vp)
+                dev->active_vp = vp;
+        
+        async_answer_0(iid, EOK);
+}
+
+static void fbsrv_vp_clear(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        assert(dev->ops.vp_clear);
+        
+        if ((dev->claimed) && (dev->active_vp)) {
+                screenbuffer_set_cursor_visibility(dev->active_vp->backbuf, false);
+                dev->ops.vp_clear(dev, dev->active_vp);
+                async_answer_0(iid, EOK);
+        } else
+                async_answer_0(iid, ENOENT);
+}
+
+static void fbsrv_vp_get_dimensions(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        if (dev->active_vp)
+                async_answer_2(iid, EOK, dev->active_vp->cols, dev->active_vp->rows);
+        else
+                async_answer_0(iid, ENOENT);
+}
+
+static void fbsrv_vp_get_caps(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        assert(dev->ops.vp_get_caps);
+        
+        if (dev->active_vp)
+                async_answer_1(iid, EOK,
+                    (sysarg_t) dev->ops.vp_get_caps(dev, dev->active_vp));
+        else
+                async_answer_0(iid, ENOENT);
+}
+
+static void fbsrv_vp_cursor_update(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        assert(dev->ops.vp_cursor_update);
+        
+        frontbuf_t *frontbuf = resolve_frontbuf(dev, IPC_GET_ARG1(*icall), iid);
+        if (frontbuf == NULL)
+                return;
+        
+        if ((dev->claimed) && (dev->active_vp)) {
+                screenbuffer_t *screenbuf = (screenbuffer_t *) frontbuf->data;
+                
+                sysarg_t prev_col;
+                sysarg_t prev_row;
+                sysarg_t col;
+                sysarg_t row;
+                
+                screenbuffer_get_cursor(dev->active_vp->backbuf,
+                    &prev_col, &prev_row);
+                screenbuffer_get_cursor(screenbuf, &col, &row);
+                screenbuffer_set_cursor(dev->active_vp->backbuf, col, row);
+                
+                bool visible = screenbuffer_get_cursor_visibility(screenbuf);
+                screenbuffer_set_cursor_visibility(dev->active_vp->backbuf, visible);
+                
+                if (visible)
+                        dev->active_vp->cursor_active = true;
+                
+                dev->ops.vp_cursor_update(dev, dev->active_vp, prev_col, prev_row,
+                    col, row, visible);
+                async_answer_0(iid, EOK);
+        } else
+                async_answer_0(iid, ENOENT);
+}
+
+static void fbsrv_vp_cursor_flash(fbdev_t *dev)
+{
+        if ((dev->claimed) && (dev->ops.vp_cursor_flash)) {
+                list_foreach (dev->vps, link) {
+                        fbvp_t *vp = list_get_instance(link, fbvp_t, link);
+                        
+                        if (vp->cursor_active) {
+                                sysarg_t col;
+                                sysarg_t row;
+                                
+                                screenbuffer_get_cursor(vp->backbuf, &col, &row);
+                                vp->cursor_flash = !vp->cursor_flash;
+                                dev->ops.vp_cursor_flash(dev, vp, col, row);
+                        }
+                }
+        }
+}
+
+static void fbsrv_sequences_update(fbdev_t *dev)
+{
+        if ((dev->claimed) && (dev->ops.vp_imgmap_damage)) {
+                list_foreach (dev->vps, vp_link) {
+                        fbvp_t *vp = list_get_instance(vp_link, fbvp_t, link);
+                        
+                        list_foreach (vp->sequences, seq_vp_link) {
+                                sequence_vp_t *seq_vp =
+                                    list_get_instance(seq_vp_link, sequence_vp_t, link);
+                                
+                                seq_vp->current++;
+                                if (seq_vp->current >= seq_vp->seq->count)
+                                        seq_vp->current = 0;
+                                
+                                link_t *link =
+                                    list_nth(&seq_vp->seq->imagemaps, seq_vp->current);
+                                if (link != NULL) {
+                                        imagemap_t *imagemap =
+                                            list_get_instance(link, imagemap_t, seq_link);
+                                        
+                                        imgmap_t *imgmap = (imgmap_t *) imagemap->data;
+                                        sysarg_t width;
+                                        sysarg_t height;
+                                        
+                                        imgmap_get_resolution(imgmap, &width, &height);
+                                        dev->ops.vp_imgmap_damage(dev, vp, imgmap,
+                                            0, 0, width, height);
+                                }
+                        }
+                }
+        }
+}
+
+static void fbsrv_vp_set_style(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        if (dev->active_vp) {
+                dev->active_vp->attrs.type = CHAR_ATTR_STYLE;
+                dev->active_vp->attrs.val.style =
+                    (console_style_t) IPC_GET_ARG1(*icall);
+                async_answer_0(iid, EOK);
+        } else
+                async_answer_0(iid, ENOENT);
+}
+
+static void fbsrv_vp_set_color(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        if (dev->active_vp) {
+                dev->active_vp->attrs.type = CHAR_ATTR_INDEX;
+                dev->active_vp->attrs.val.index.bgcolor =
+                    (console_color_t) IPC_GET_ARG1(*icall);
+                dev->active_vp->attrs.val.index.fgcolor =
+                    (console_color_t) IPC_GET_ARG2(*icall);
+                dev->active_vp->attrs.val.index.attr =
+                    (console_color_attr_t) IPC_GET_ARG3(*icall);
+                async_answer_0(iid, EOK);
+        } else
+                async_answer_0(iid, ENOENT);
+}
+
+static void fbsrv_vp_set_rgb_color(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        if (dev->active_vp) {
+                dev->active_vp->attrs.type = CHAR_ATTR_RGB;
+                dev->active_vp->attrs.val.rgb.bgcolor = IPC_GET_ARG1(*icall);
+                dev->active_vp->attrs.val.rgb.fgcolor = IPC_GET_ARG2(*icall);
+                async_answer_0(iid, EOK);
+        } else
+                async_answer_0(iid, ENOENT);
+}
+
+static void fbsrv_vp_putchar(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        assert(dev->ops.vp_char_update);
+        
+        if ((dev->claimed) && (dev->active_vp)) {
+                charfield_t *field = screenbuffer_field_at(dev->active_vp->backbuf,
+                    IPC_GET_ARG1(*icall), IPC_GET_ARG2(*icall));
+                
+                field->ch = IPC_GET_ARG3(*icall);
+                
+                dev->ops.vp_char_update(dev, dev->active_vp, IPC_GET_ARG1(*icall),
+                    IPC_GET_ARG2(*icall));
+                async_answer_0(iid, EOK);
+        } else
+                async_answer_0(iid, ENOENT);
+}
+
+static bool fbsrv_vp_update_scroll(fbdev_t *dev, fbvp_t *vp,
+    screenbuffer_t *frontbuf)
+{
+        assert(dev->ops.vp_char_update);
+        
+        sysarg_t top_row = screenbuffer_get_top_row(frontbuf);
+        
+        if (vp->top_row == top_row)
+                return false;
+        
+        vp->top_row = top_row;
+        
+        for (sysarg_t y = 0; y < vp->rows; y++) {
+                for (sysarg_t x = 0; x < vp->cols; x++) {
+                        charfield_t *front_field =
+                            screenbuffer_field_at(frontbuf, x, y);
+                        charfield_t *back_field =
+                            screenbuffer_field_at(vp->backbuf, x, y);
+                        bool update = false;
+                        
+                        if (front_field->ch != back_field->ch) {
+                                back_field->ch = front_field->ch;
+                                update = true;
+                        }
+                        
+                        if (!attrs_same(front_field->attrs, back_field->attrs)) {
+                                back_field->attrs = front_field->attrs;
+                                update = true;
+                        }
+                        
+                        front_field->flags &= ~CHAR_FLAG_DIRTY;
+                        
+                        if (update)
+                                dev->ops.vp_char_update(dev, vp, x, y);
+                }
+        }
+        
+        return true;
+}
+
+static void fbsrv_vp_update(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        assert(dev->ops.vp_char_update);
+        
+        frontbuf_t *frontbuf = resolve_frontbuf(dev, IPC_GET_ARG1(*icall), iid);
+        if (frontbuf == NULL)
+                return;
+        
+        if ((dev->claimed) && (dev->active_vp)) {
+                fbvp_t *vp = dev->active_vp;
+                screenbuffer_t *screenbuf = (screenbuffer_t *) frontbuf->data;
+                
+                if (fbsrv_vp_update_scroll(dev, vp, screenbuf)) {
+                        async_answer_0(iid, EOK);
+                        return;
+                }
+                
+                for (sysarg_t y = 0; y < vp->rows; y++) {
+                        for (sysarg_t x = 0; x < vp->cols; x++) {
+                                charfield_t *front_field =
+                                    screenbuffer_field_at(screenbuf, x, y);
+                                charfield_t *back_field =
+                                    screenbuffer_field_at(vp->backbuf, x, y);
+                                bool update = false;
+                                
+                                if ((front_field->flags & CHAR_FLAG_DIRTY) == CHAR_FLAG_DIRTY) {
+                                        if (front_field->ch != back_field->ch) {
+                                                back_field->ch = front_field->ch;
+                                                update = true;
+                                        }
+                                        
+                                        if (!attrs_same(front_field->attrs, back_field->attrs)) {
+                                                back_field->attrs = front_field->attrs;
+                                                update = true;
+                                        }
+                                        
+                                        front_field->flags &= ~CHAR_FLAG_DIRTY;
+                                }
+                                
+                                if (update)
+                                        dev->ops.vp_char_update(dev, vp, x, y);
+                        }
+                }
+                
+                async_answer_0(iid, EOK);
+        } else
+                async_answer_0(iid, ENOENT);
+}
+
+static void fbsrv_vp_damage(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        assert(dev->ops.vp_char_update);
+        
+        frontbuf_t *frontbuf = resolve_frontbuf(dev, IPC_GET_ARG1(*icall), iid);
+        if (frontbuf == NULL)
+                return;
+        
+        if ((dev->claimed) && (dev->active_vp)) {
+                fbvp_t *vp = dev->active_vp;
+                screenbuffer_t *screenbuf = (screenbuffer_t *) frontbuf->data;
+                
+                if (fbsrv_vp_update_scroll(dev, vp, screenbuf)) {
+                        async_answer_0(iid, EOK);
+                        return;
+                }
+                
+                sysarg_t col = IPC_GET_ARG2(*icall);
+                sysarg_t row = IPC_GET_ARG3(*icall);
+                
+                sysarg_t cols = IPC_GET_ARG4(*icall);
+                sysarg_t rows = IPC_GET_ARG5(*icall);
+                
+                for (sysarg_t y = 0; y < rows; y++) {
+                        for (sysarg_t x = 0; x < cols; x++) {
+                                charfield_t *front_field =
+                                    screenbuffer_field_at(screenbuf, col + x, row + y);
+                                charfield_t *back_field =
+                                    screenbuffer_field_at(vp->backbuf, col + x, row + y);
+                                bool update = false;
+                                
+                                if (front_field->ch != back_field->ch) {
+                                        back_field->ch = front_field->ch;
+                                        update = true;
+                                }
+                                
+                                if (!attrs_same(front_field->attrs, back_field->attrs)) {
+                                        back_field->attrs = front_field->attrs;
+                                        update = true;
+                                }
+                                
+                                front_field->flags &= ~CHAR_FLAG_DIRTY;
+                                
+                                if (update)
+                                        dev->ops.vp_char_update(dev, vp, col + x, row + y);
+                        }
+                }
+                
+                async_answer_0(iid, EOK);
+        } else
+                async_answer_0(iid, ENOENT);
+}
+
+static void fbsrv_vp_imagemap_damage(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        imagemap_t *imagemap = resolve_imagemap(dev, IPC_GET_ARG1(*icall), iid);
+        if (imagemap == NULL)
+                return;
+        
+        if ((dev->claimed) && (dev->ops.vp_imgmap_damage)) {
+                if (dev->active_vp) {
+                        dev->ops.vp_imgmap_damage(dev, dev->active_vp,
+                            (imgmap_t *) imagemap->data,
+                            IPC_GET_ARG2(*icall), IPC_GET_ARG3(*icall),
+                            IPC_GET_ARG4(*icall), IPC_GET_ARG5(*icall));
+                        async_answer_0(iid, EOK);
+                } else
+                        async_answer_0(iid, ENOENT);
+        } else
+                async_answer_0(iid, ENOTSUP);
+}
+
+static void fbsrv_vp_sequence_start(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        sequence_t *sequence = resolve_sequence(dev, IPC_GET_ARG1(*icall), iid);
+        if (sequence == NULL)
+                return;
+        
+        if (dev->active_vp) {
+                /* Check if the sequence is not already started */
+                list_foreach(dev->active_vp->sequences, link) {
+                        sequence_vp_t *seq_vp =
+                            list_get_instance(link, sequence_vp_t, link);
+                        
+                        if (seq_vp->seq == sequence) {
+                                async_answer_0(iid, EEXISTS);
+                                return;
+                        }
+                }
+                
+                sequence_vp_t *seq_vp =
+                    (sequence_vp_t *) malloc(sizeof(sequence_vp_t));
+                
+                if (seq_vp != NULL) {
+                        link_initialize(&seq_vp->link);
+                        seq_vp->seq = sequence;
+                        seq_vp->current = 0;
+                        
+                        list_append(&seq_vp->link, &dev->active_vp->sequences);
+                        async_answer_0(iid, EOK);
+                } else
+                        async_answer_0(iid, ENOMEM);
+        } else
+                async_answer_0(iid, ENOENT);
+}
+
+static void fbsrv_vp_sequence_stop(fbdev_t *dev, ipc_callid_t iid, ipc_call_t *icall)
+{
+        sequence_t *sequence = resolve_sequence(dev, IPC_GET_ARG1(*icall), iid);
+        if (sequence == NULL)
+                return;
+        
+        if (dev->active_vp) {
+                list_foreach(dev->active_vp->sequences, link) {
+                        sequence_vp_t *seq_vp =
+                            list_get_instance(link, sequence_vp_t, link);
+                        
+                        if (seq_vp->seq == sequence) {
+                                list_remove(&seq_vp->link);
+                                free(seq_vp);
+                                
+                                async_answer_0(iid, EOK);
+                                return;
+                        }
+                }
+                
+                async_answer_0(iid, ENOENT);
+        } else
+                async_answer_0(iid, ENOENT);
+}
+
+static void client_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg)
+{
+        fbdev_t *dev = NULL;
+        service_id_t dsid = (service_id_t) IPC_GET_ARG1(*icall);
+        
+        list_foreach(fbdevs, link) {
+                fbdev_t *fbdev = list_get_instance(link, fbdev_t, link);
+                if (fbdev->dsid == dsid) {
+                        dev = fbdev;
+                        break;
+                }
+        }
+        
+        if (dev == NULL) {
+                async_answer_0(iid, ENOENT);
+                return;
+        }
+        
+        if (atomic_get(&dev->refcnt) > 0) {
+                async_answer_0(iid, ELIMIT);
+                return;
+        }
         
         /*
-         * Style and glyphs for text printing
+         * Accept the connection
          */
         
-        /** Current attributes. */
-        attr_rgb_t attr;
-        
-        uint8_t *bgpixel;
-        
-        /**
-         * Glyph drawing function for this viewport.  Different viewports
-         * might use different drawing functions depending on whether their
-         * scanlines are aligned on a word boundary.
-         */
-        dg_t dglyph;
-        
-        /* Auto-cursor position */
-        bool cursor_active;
-        unsigned int cur_col;
-        unsigned int cur_row;
-        bool cursor_shown;
-        
-        /* Back buffer */
-        bb_cell_t *backbuf;
-        unsigned int bbsize;
-} viewport_t;
-
-typedef struct {
-        bool initialized;
-        bool enabled;
-        unsigned int vp;
-        
-        unsigned int pos;
-        unsigned int animlen;
-        unsigned int imgmaps[MAX_ANIM_LEN];
-} animation_t;
-
-static animation_t animations[MAX_ANIMATIONS];
-static bool anims_enabled;
-
-static imgmap_t *imgmaps[MAX_IMGMAPS];
-static viewport_t viewports[128];
-
-static bool client_connected = false;  /**< Allow only 1 connection */
-
-static uint32_t color_table[16] = {
-        [COLOR_BLACK]       = 0x000000,
-        [COLOR_BLUE]        = 0x0000f0,
-        [COLOR_GREEN]       = 0x00f000,
-        [COLOR_CYAN]        = 0x00f0f0,
-        [COLOR_RED]         = 0xf00000,
-        [COLOR_MAGENTA]     = 0xf000f0,
-        [COLOR_YELLOW]      = 0xf0f000,
-        [COLOR_WHITE]       = 0xf0f0f0,
-        
-        [8 + COLOR_BLACK]   = 0x000000,
-        [8 + COLOR_BLUE]    = 0x0000ff,
-        [8 + COLOR_GREEN]   = 0x00ff00,
-        [8 + COLOR_CYAN]    = 0x00ffff,
-        [8 + COLOR_RED]     = 0xff0000,
-        [8 + COLOR_MAGENTA] = 0xff00ff,
-        [8 + COLOR_YELLOW]  = 0xffff00,
-        [8 + COLOR_WHITE]   = 0xffffff,
-};
-
-static int rgb_from_attr(attr_rgb_t *rgb, const attrs_t *a);
-static int rgb_from_style(attr_rgb_t *rgb, int style);
-static int rgb_from_idx(attr_rgb_t *rgb, sysarg_t fg_color,
-    sysarg_t bg_color, sysarg_t flags);
-
-static int fb_set_color(viewport_t *vport, sysarg_t fg_color,
-    sysarg_t bg_color, sysarg_t attr);
-
-static void draw_glyph_aligned(unsigned int x, unsigned int y, bool cursor,
-    uint8_t *glyphs, uint32_t glyph, uint32_t fg_color, uint32_t bg_color);
-static void draw_glyph_fallback(unsigned int x, unsigned int y, bool cursor,
-    uint8_t *glyphs, uint32_t glyph, uint32_t fg_color, uint32_t bg_color);
-
-static void draw_vp_glyph(viewport_t *vport, bool cursor, unsigned int col,
-    unsigned int row);
-
-#define RED(x, bits)                 (((x) >> (8 + 8 + 8 - (bits))) & ((1 << (bits)) - 1))
-#define GREEN(x, bits)               (((x) >> (8 + 8 - (bits))) & ((1 << (bits)) - 1))
-#define BLUE(x, bits)                (((x) >> (8 - (bits))) & ((1 << (bits)) - 1))
-
-#define COL2X(col)                   ((col) * FONT_WIDTH)
-#define ROW2Y(row)                   ((row) * FONT_SCANLINES)
-
-#define X2COL(x)                     ((x) / FONT_WIDTH)
-#define Y2ROW(y)                     ((y) / FONT_SCANLINES)
-
-#define FB_POS(x, y)                 ((y) * screen.scanline + (x) * screen.pixelbytes)
-#define BB_POS(vport, col, row)      ((row) * vport->cols + (col))
-#define GLYPH_POS(glyph, y, cursor)  (((glyph) + (cursor) * FONT_GLYPHS) * screen.glyphbytes + (y) * screen.glyphscanline)
-
-/*
- * RGB conversion and mask functions.
- *
- * These functions write an RGB value to some memory in some predefined format.
- * The naming convention corresponds to the format created by these functions.
- * The functions use the so called network order (i.e. big endian) with respect
- * to their names.
- */
-
-static void rgb_0888(void *dst, uint32_t rgb)
-{
-        *((uint32_t *) dst) = host2uint32_t_be((0 << 24) |
-            (RED(rgb, 8) << 16) | (GREEN(rgb, 8) << 8) | (BLUE(rgb, 8)));
-}
-
-static void bgr_0888(void *dst, uint32_t rgb)
-{
-        *((uint32_t *) dst) = host2uint32_t_be((0 << 24) |
-            (BLUE(rgb, 8) << 16) | (GREEN(rgb, 8) << 8) | (RED(rgb, 8)));
-}
-
-static void mask_0888(void *dst, bool mask)
-{
-        bgr_0888(dst, mask ? 0xffffff : 0);
-}
-
-static void rgb_8880(void *dst, uint32_t rgb)
-{
-        *((uint32_t *) dst) = host2uint32_t_be((RED(rgb, 8) << 24) |
-            (GREEN(rgb, 8) << 16) | (BLUE(rgb, 8) << 8) | 0);
-}
-
-static void bgr_8880(void *dst, uint32_t rgb)
-{
-        *((uint32_t *) dst) = host2uint32_t_be((BLUE(rgb, 8) << 24) |
-            (GREEN(rgb, 8) << 16) | (RED(rgb, 8) << 8) | 0);
-}
-
-static void mask_8880(void *dst, bool mask)
-{
-        bgr_8880(dst, mask ? 0xffffff : 0);
-}
-
-static void rgb_888(void *dst, uint32_t rgb)
-{
-        ((uint8_t *) dst)[0] = RED(rgb, 8);
-        ((uint8_t *) dst)[1] = GREEN(rgb, 8);
-        ((uint8_t *) dst)[2] = BLUE(rgb, 8);
-}
-
-static void bgr_888(void *dst, uint32_t rgb)
-{
-        ((uint8_t *) dst)[0] = BLUE(rgb, 8);
-        ((uint8_t *) dst)[1] = GREEN(rgb, 8);
-        ((uint8_t *) dst)[2] = RED(rgb, 8);
-}
-
-static void mask_888(void *dst, bool mask)
-{
-        bgr_888(dst, mask ? 0xffffff : 0);
-}
-
-static void rgb_555_be(void *dst, uint32_t rgb)
-{
-        *((uint16_t *) dst) = host2uint16_t_be(RED(rgb, 5) << 10 |
-            GREEN(rgb, 5) << 5 | BLUE(rgb, 5));
-}
-
-static void rgb_555_le(void *dst, uint32_t rgb)
-{
-        *((uint16_t *) dst) = host2uint16_t_le(RED(rgb, 5) << 10 |
-            GREEN(rgb, 5) << 5 | BLUE(rgb, 5));
-}
-
-static void rgb_565_be(void *dst, uint32_t rgb)
-{
-        *((uint16_t *) dst) = host2uint16_t_be(RED(rgb, 5) << 11 |
-            GREEN(rgb, 6) << 5 | BLUE(rgb, 5));
-}
-
-static void rgb_565_le(void *dst, uint32_t rgb)
-{
-        *((uint16_t *) dst) = host2uint16_t_le(RED(rgb, 5) << 11 |
-            GREEN(rgb, 6) << 5 | BLUE(rgb, 5));
-}
-
-static void mask_555(void *dst, bool mask)
-{
-        rgb_555_be(dst, mask ? 0xffffff : 0);
-}
-
-static void mask_565(void *dst, bool mask)
-{
-        rgb_565_be(dst, mask ? 0xffffff : 0);
-}
-
-static void bgr_323(void *dst, uint32_t rgb)
-{
-        *((uint8_t *) dst)
-            = ~((RED(rgb, 3) << 5) | (GREEN(rgb, 2) << 3) | BLUE(rgb, 3));
-}
-
-static void mask_323(void *dst, bool mask)
-{
-        bgr_323(dst, mask ? 0x0 : ~0x0);
-}
-
-/** Draw a filled rectangle.
- *
- * @note Need real implementation that does not access VRAM twice.
- *
- */
-static void draw_filled_rect(unsigned int x0, unsigned int y0, unsigned int x1,
-    unsigned int y1, uint32_t color)
-{
-        unsigned int x;
-        unsigned int y;
-        unsigned int copy_bytes;
-        
-        uint8_t *sp;
-        uint8_t *dp;
-        uint8_t cbuf[4];
-        
-        if ((y0 >= y1) || (x0 >= x1))
-                return;
-        
-        screen.rgb_conv(cbuf, color);
-        
-        sp = &screen.fb_addr[FB_POS(x0, y0)];
-        dp = sp;
-        
-        /* Draw the first line. */
-        for (x = x0; x < x1; x++) {
-                memcpy(dp, cbuf, screen.pixelbytes);
-                dp += screen.pixelbytes;
-        }
-        
-        dp = sp + screen.scanline;
-        copy_bytes = (x1 - x0) * screen.pixelbytes;
-        
-        /* Draw the remaining lines by copying. */
-        for (y = y0 + 1; y < y1; y++) {
-                memcpy(dp, sp, copy_bytes);
-                dp += screen.scanline;
-        }
-}
-
-/** Redraw viewport.
- *
- * @param vport Viewport to redraw
- *
- */
-static void vport_redraw(viewport_t *vport)
-{
-        unsigned int col;
-        unsigned int row;
-        
-        for (row = 0; row < vport->rows; row++) {
-                for (col = 0; col < vport->cols; col++) {
-                        draw_vp_glyph(vport, false, col, row);
-                }
-        }
-        
-        if (COL2X(vport->cols) < vport->width) {
-                draw_filled_rect(
-                    vport->x + COL2X(vport->cols), vport->y,
-                    vport->x + vport->width, vport->y + vport->height,
-                    vport->attr.bg_color);
-        }
-        
-        if (ROW2Y(vport->rows) < vport->height) {
-                draw_filled_rect(
-                    vport->x, vport->y + ROW2Y(vport->rows),
-                    vport->x + vport->width, vport->y + vport->height,
-                    vport->attr.bg_color);
-        }
-}
-
-static void backbuf_clear(bb_cell_t *backbuf, size_t len, uint32_t fg_color,
-    uint32_t bg_color)
-{
-        size_t i;
-        
-        for (i = 0; i < len; i++) {
-                backbuf[i].glyph = 0;
-                backbuf[i].fg_color = fg_color;
-                backbuf[i].bg_color = bg_color;
-        }
-}
-
-/** Clear viewport.
- *
- * @param vport Viewport to clear
- *
- */
-static void vport_clear(viewport_t *vport)
-{
-        backbuf_clear(vport->backbuf, vport->cols * vport->rows,
-            vport->attr.fg_color, vport->attr.bg_color);
-        vport_redraw(vport);
-}
-
-/** Scroll viewport by the specified number of lines.
- *
- * @param vport Viewport to scroll
- * @param lines Number of lines to scroll
- *
- */
-static void vport_scroll(viewport_t *vport, int lines)
-{
-        unsigned int col;
-        unsigned int row;
-        unsigned int x;
-        unsigned int y;
-        uint32_t glyph;
-        uint32_t fg_color;
-        uint32_t bg_color;
-        bb_cell_t *bbp;
-        bb_cell_t *xbp;
-        
-        /*
-         * Redraw.
-         */
-        
-        y = vport->y;
-        for (row = 0; row < vport->rows; row++) {
-                x = vport->x;
-                for (col = 0; col < vport->cols; col++) {
-                        if (((int) row + lines >= 0) &&
-                            ((int) row + lines < (int) vport->rows)) {
-                                xbp = &vport->backbuf[BB_POS(vport, col, row + lines)];
-                                bbp = &vport->backbuf[BB_POS(vport, col, row)];
-                                
-                                glyph = xbp->glyph;
-                                fg_color = xbp->fg_color;
-                                bg_color = xbp->bg_color;
-                                
-                                if ((bbp->glyph == glyph)
-                                   && (bbp->fg_color == xbp->fg_color)
-                                   && (bbp->bg_color == xbp->bg_color)) {
-                                        x += FONT_WIDTH;
-                                        continue;
-                                }
-                        } else {
-                                glyph = 0;
-                                fg_color = vport->attr.fg_color;
-                                bg_color = vport->attr.bg_color;
-                        }
-                        
-                        (*vport->dglyph)(x, y, false, screen.glyphs, glyph,
-                            fg_color, bg_color);
-                        x += FONT_WIDTH;
-                }
-                y += FONT_SCANLINES;
-        }
-        
-        /*
-         * Scroll backbuffer.
-         */
-        
-        if (lines > 0) {
-                memmove(vport->backbuf, vport->backbuf + vport->cols * lines,
-                    vport->cols * (vport->rows - lines) * sizeof(bb_cell_t));
-                backbuf_clear(&vport->backbuf[BB_POS(vport, 0, vport->rows - lines)],
-                    vport->cols * lines, vport->attr.fg_color, vport->attr.bg_color);
-        } else {
-                memmove(vport->backbuf - vport->cols * lines, vport->backbuf,
-                    vport->cols * (vport->rows + lines) * sizeof(bb_cell_t));
-                backbuf_clear(vport->backbuf, - vport->cols * lines,
-                    vport->attr.fg_color, vport->attr.bg_color);
-        }
-}
-
-/** Render glyphs
- *
- * Convert glyphs from device independent font
- * description to current visual representation.
- *
- */
-static void render_glyphs(void)
-{
-        unsigned int glyph;
-        
-        for (glyph = 0; glyph < FONT_GLYPHS; glyph++) {
-                unsigned int y;
-                
-                for (y = 0; y < FONT_SCANLINES; y++) {
-                        unsigned int x;
-                        
-                        for (x = 0; x < FONT_WIDTH; x++) {
-                                screen.mask_conv(&screen.glyphs[GLYPH_POS(glyph, y, false) + x * screen.pixelbytes],
-                                    (fb_font[glyph][y] & (1 << (7 - x))) ? true : false);
-                                
-                                screen.mask_conv(&screen.glyphs[GLYPH_POS(glyph, y, true) + x * screen.pixelbytes],
-                                    (fb_font[glyph][y] & (1 << (7 - x))) ? false : true);
-                        }
-                }
-        }
-}
-
-/** Create new viewport
- *
- * @param x      Origin of the viewport (x).
- * @param y      Origin of the viewport (y).
- * @param width  Width of the viewport.
- * @param height Height of the viewport.
- *
- * @return New viewport number.
- *
- */
-static int vport_create(unsigned int x, unsigned int y,
-    unsigned int width, unsigned int height)
-{
-        unsigned int i;
-        
-        for (i = 0; i < MAX_VIEWPORTS; i++) {
-                if (!viewports[i].initialized)
+        atomic_inc(&dev->refcnt);
+        dev->claimed = true;
+        async_answer_0(iid, EOK);
+        
+        while (true) {
+                ipc_call_t call;
+                ipc_callid_t callid =
+                    async_get_call_timeout(&call, TICK_INTERVAL);
+                
+                if (!callid) {
+                        fbsrv_vp_cursor_flash(dev);
+                        fbsrv_sequences_update(dev);
+                        continue;
+                }
+                
+                if (!IPC_GET_IMETHOD(call)) {
+                        dev->claimed = false;
+                        atomic_dec(&dev->refcnt);
+                        async_answer_0(callid, EOK);
                         break;
-        }
-        
-        if (i == MAX_VIEWPORTS)
-                return ELIMIT;
-        
-        unsigned int cols = width / FONT_WIDTH;
-        unsigned int rows = height / FONT_SCANLINES;
-        unsigned int bbsize = cols * rows * sizeof(bb_cell_t);
-        unsigned int word_size = sizeof(unsigned long);
-        
-        bb_cell_t *backbuf = (bb_cell_t *) malloc(bbsize);
-        if (!backbuf)
-                return ENOMEM;
-        
-        uint8_t *bgpixel = (uint8_t *) malloc(screen.pixelbytes);
-        if (!bgpixel) {
-                free(backbuf);
-                return ENOMEM;
-        }
-        
-        backbuf_clear(backbuf, cols * rows, DEFAULT_FGCOLOR, DEFAULT_BGCOLOR);
-        memset(bgpixel, 0, screen.pixelbytes);
-        
-        viewports[i].x = x;
-        viewports[i].y = y;
-        viewports[i].width = width;
-        viewports[i].height = height;
-        
-        viewports[i].cols = cols;
-        viewports[i].rows = rows;
-        
-        viewports[i].attr.bg_color = DEFAULT_BGCOLOR;
-        viewports[i].attr.fg_color = DEFAULT_FGCOLOR;
-        
-        viewports[i].bgpixel = bgpixel;
-        
-        /*
-         * Conditions necessary to select aligned version:
-         *  - word size is divisible by pixelbytes
-         *  - cell scanline size is divisible by word size
-         *  - cell scanlines are word-aligned
-         *
-         */
-        if (((word_size % screen.pixelbytes) == 0)
-            && ((FONT_WIDTH * screen.pixelbytes) % word_size == 0)
-            && ((x * screen.pixelbytes) % word_size == 0)
-            && (screen.scanline % word_size == 0)) {
-                viewports[i].dglyph = draw_glyph_aligned;
-        } else {
-                viewports[i].dglyph = draw_glyph_fallback;
-        }
-        
-        viewports[i].cur_col = 0;
-        viewports[i].cur_row = 0;
-        viewports[i].cursor_active = false;
-        viewports[i].cursor_shown = false;
-        
-        viewports[i].bbsize = bbsize;
-        viewports[i].backbuf = backbuf;
-        
-        viewports[i].initialized = true;
-        
-        screen.rgb_conv(viewports[i].bgpixel, viewports[i].attr.bg_color);
-        
-        return i;
-}
-
-
-/** Initialize framebuffer as a chardev output device
- *
- * @param addr   Address of the framebuffer
- * @param xres   Screen width in pixels
- * @param yres   Screen height in pixels
- * @param visual Bits per pixel (8, 16, 24, 32)
- * @param scan   Bytes per one scanline
- *
- */
-static bool screen_init(void *addr, unsigned int xres, unsigned int yres,
-    unsigned int scan, unsigned int visual)
-{
-        switch (visual) {
-        case VISUAL_INDIRECT_8:
-                screen.rgb_conv = bgr_323;
-                screen.mask_conv = mask_323;
-                screen.pixelbytes = 1;
-                break;
-        case VISUAL_RGB_5_5_5_LE:
-                screen.rgb_conv = rgb_555_le;
-                screen.mask_conv = mask_555;
-                screen.pixelbytes = 2;
-                break;
-        case VISUAL_RGB_5_5_5_BE:
-                screen.rgb_conv = rgb_555_be;
-                screen.mask_conv = mask_555;
-                screen.pixelbytes = 2;
-                break;
-        case VISUAL_RGB_5_6_5_LE:
-                screen.rgb_conv = rgb_565_le;
-                screen.mask_conv = mask_565;
-                screen.pixelbytes = 2;
-                break;
-        case VISUAL_RGB_5_6_5_BE:
-                screen.rgb_conv = rgb_565_be;
-                screen.mask_conv = mask_565;
-                screen.pixelbytes = 2;
-                break;
-        case VISUAL_RGB_8_8_8:
-                screen.rgb_conv = rgb_888;
-                screen.mask_conv = mask_888;
-                screen.pixelbytes = 3;
-                break;
-        case VISUAL_BGR_8_8_8:
-                screen.rgb_conv = bgr_888;
-                screen.mask_conv = mask_888;
-                screen.pixelbytes = 3;
-                break;
-        case VISUAL_RGB_8_8_8_0:
-                screen.rgb_conv = rgb_8880;
-                screen.mask_conv = mask_8880;
-                screen.pixelbytes = 4;
-                break;
-        case VISUAL_RGB_0_8_8_8:
-                screen.rgb_conv = rgb_0888;
-                screen.mask_conv = mask_0888;
-                screen.pixelbytes = 4;
-                break;
-        case VISUAL_BGR_0_8_8_8:
-                screen.rgb_conv = bgr_0888;
-                screen.mask_conv = mask_0888;
-                screen.pixelbytes = 4;
-                break;
-        case VISUAL_BGR_8_8_8_0:
-                screen.rgb_conv = bgr_8880;
-                screen.mask_conv = mask_8880;
-                screen.pixelbytes = 4;
-                break;
-        default:
-                return false;
-        }
-        
-        screen.fb_addr = (unsigned char *) addr;
-        screen.xres = xres;
-        screen.yres = yres;
-        screen.scanline = scan;
-        
-        screen.glyphscanline = FONT_WIDTH * screen.pixelbytes;
-        screen.glyphbytes = screen.glyphscanline * FONT_SCANLINES;
-        
-        size_t glyphsize = 2 * FONT_GLYPHS * screen.glyphbytes;
-        uint8_t *glyphs = (uint8_t *) malloc(glyphsize);
-        if (!glyphs)
-                return false;
-        
-        memset(glyphs, 0, glyphsize);
-        screen.glyphs = glyphs;
-        
-        render_glyphs();
-        
-        /* Create first viewport */
-        vport_create(0, 0, xres, yres);
-        
-        return true;
-}
-
-
-/** Draw a glyph, takes advantage of alignment.
- *
- * This version can only be used if the following conditions are met:
- *
- *   - word size is divisible by pixelbytes
- *   - cell scanline size is divisible by word size
- *   - cell scanlines are word-aligned
- *
- * It makes use of the pre-rendered mask to process (possibly) several
- * pixels at once (word size / pixelbytes pixels at a time are processed)
- * making it very fast. Most notably this version is not applicable at 24 bits
- * per pixel.
- *
- * @param x        x coordinate of top-left corner on screen.
- * @param y        y coordinate of top-left corner on screen.
- * @param cursor   Draw glyph with cursor
- * @param glyphs   Pointer to font bitmap.
- * @param glyph    Code of the glyph to draw.
- * @param fg_color Foreground color.
- * @param bg_color Backgroudn color.
- *
- */
-static void draw_glyph_aligned(unsigned int x, unsigned int y, bool cursor,
-    uint8_t *glyphs, uint32_t glyph, uint32_t fg_color, uint32_t bg_color)
-{
-        unsigned int i;
-        unsigned int yd;
-        unsigned long fg_buf;
-        unsigned long bg_buf;
-        unsigned long mask;
-        
-        /*
-         * Prepare a pair of words, one filled with foreground-color
-         * pattern and the other filled with background-color pattern.
-         */
-        for (i = 0; i < sizeof(unsigned long) / screen.pixelbytes; i++) {
-                screen.rgb_conv(&((uint8_t *) &fg_buf)[i * screen.pixelbytes],
-                    fg_color);
-                screen.rgb_conv(&((uint8_t *) &bg_buf)[i * screen.pixelbytes],
-                    bg_color);
-        }
-        
-        /* Pointer to the current position in the mask. */
-        unsigned long *maskp = (unsigned long *) &glyphs[GLYPH_POS(glyph, 0, cursor)];
-        
-        /* Pointer to the current position on the screen. */
-        unsigned long *dp = (unsigned long *) &screen.fb_addr[FB_POS(x, y)];
-        
-        /* Width of the character cell in words. */
-        unsigned int ww = FONT_WIDTH * screen.pixelbytes / sizeof(unsigned long);
-        
-        /* Offset to add when moving to another screen scanline. */
-        unsigned int d_add = screen.scanline - FONT_WIDTH * screen.pixelbytes;
-        
-        for (yd = 0; yd < FONT_SCANLINES; yd++) {
-                /*
-                 * Now process the cell scanline, combining foreground
-                 * and background color patters using the pre-rendered mask.
-                 */
-                for (i = 0; i < ww; i++) {
-                        mask = *maskp++;
-                        *dp++ = (fg_buf & mask) | (bg_buf & ~mask);
-                }
-                
-                /* Move to the beginning of the next scanline of the cell. */
-                dp = (unsigned long *) ((uint8_t *) dp + d_add);
-        }
-}
-
-/** Draw a glyph, fallback version.
- *
- * This version does not make use of the pre-rendered mask, it uses
- * the font bitmap directly. It works always, but it is slower.
- *
- * @param x        x coordinate of top-left corner on screen.
- * @param y        y coordinate of top-left corner on screen.
- * @param cursor   Draw glyph with cursor
- * @param glyphs   Pointer to font bitmap.
- * @param glyph    Code of the glyph to draw.
- * @param fg_color Foreground color.
- * @param bg_color Backgroudn color.
- *
- */
-void draw_glyph_fallback(unsigned int x, unsigned int y, bool cursor,
-    uint8_t *glyphs, uint32_t glyph, uint32_t fg_color, uint32_t bg_color)
-{
-        unsigned int i;
-        unsigned int j;
-        unsigned int yd;
-        uint8_t fg_buf[4];
-        uint8_t bg_buf[4];
-        uint8_t *sp;
-        uint8_t b;
-        
-        /* Pre-render 1x the foreground and background color pixels. */
-        if (cursor) {
-                screen.rgb_conv(fg_buf, bg_color);
-                screen.rgb_conv(bg_buf, fg_color);
-        } else {
-                screen.rgb_conv(fg_buf, fg_color);
-                screen.rgb_conv(bg_buf, bg_color);
-        }
-        
-        /* Pointer to the current position on the screen. */
-        uint8_t *dp = (uint8_t *) &screen.fb_addr[FB_POS(x, y)];
-        
-        /* Offset to add when moving to another screen scanline. */
-        unsigned int d_add = screen.scanline - FONT_WIDTH * screen.pixelbytes;
-        
-        for (yd = 0; yd < FONT_SCANLINES; yd++) {
-                /* Byte containing bits of the glyph scanline. */
-                b = fb_font[glyph][yd];
-                
-                for (i = 0; i < FONT_WIDTH; i++) {
-                        /* Choose color based on the current bit. */
-                        sp = (b & 0x80) ? fg_buf : bg_buf;
-                        
-                        /* Copy the pixel. */
-                        for (j = 0; j < screen.pixelbytes; j++) {
-                                *dp++ = *sp++;
-                        }
-                        
-                        /* Move to the next bit. */
-                        b = b << 1;
-                }
-                
-                /* Move to the beginning of the next scanline of the cell. */
-                dp += d_add;
-        }
-}
-
-/** Draw glyph at specified position in viewport.
- *
- * @param vport  Viewport identification
- * @param cursor Draw glyph with cursor
- * @param col    Screen position relative to viewport
- * @param row    Screen position relative to viewport
- *
- */
-static void draw_vp_glyph(viewport_t *vport, bool cursor, unsigned int col,
-    unsigned int row)
-{
-        unsigned int x = vport->x + COL2X(col);
-        unsigned int y = vport->y + ROW2Y(row);
-        
-        uint32_t glyph = vport->backbuf[BB_POS(vport, col, row)].glyph;
-        uint32_t fg_color = vport->backbuf[BB_POS(vport, col, row)].fg_color;
-        uint32_t bg_color = vport->backbuf[BB_POS(vport, col, row)].bg_color;
-        
-        (*vport->dglyph)(x, y, cursor, screen.glyphs, glyph,
-            fg_color, bg_color);
-}
-
-/** Hide cursor if it is shown
- *
- */
-static void cursor_hide(viewport_t *vport)
-{
-        if ((vport->cursor_active) && (vport->cursor_shown)) {
-                draw_vp_glyph(vport, false, vport->cur_col, vport->cur_row);
-                vport->cursor_shown = false;
-        }
-}
-
-/** Show cursor if cursor showing is enabled
- *
- */
-static void cursor_show(viewport_t *vport)
-{
-        /* Do not check for cursor_shown */
-        if (vport->cursor_active) {
-                draw_vp_glyph(vport, true, vport->cur_col, vport->cur_row);
-                vport->cursor_shown = true;
-        }
-}
-
-/** Invert cursor, if it is enabled
- *
- */
-static void cursor_blink(viewport_t *vport)
-{
-        if (vport->cursor_shown)
-                cursor_hide(vport);
-        else
-                cursor_show(vport);
-}
-
-/** Draw character at given position relative to viewport
- *
- * @param vport  Viewport identification
- * @param c      Character to draw
- * @param col    Screen position relative to viewport
- * @param row    Screen position relative to viewport
- *
- */
-static void draw_char(viewport_t *vport, wchar_t c, unsigned int col, unsigned int row)
-{
-        bb_cell_t *bbp;
-        
-        /* Do not hide cursor if we are going to overwrite it */
-        if ((vport->cursor_active) && (vport->cursor_shown) &&
-            ((vport->cur_col != col) || (vport->cur_row != row)))
-                cursor_hide(vport);
-        
-        bbp = &vport->backbuf[BB_POS(vport, col, row)];
-        bbp->glyph = fb_font_glyph(c);
-        bbp->fg_color = vport->attr.fg_color;
-        bbp->bg_color = vport->attr.bg_color;
-        
-        draw_vp_glyph(vport, false, col, row);
-        
-        vport->cur_col = col;
-        vport->cur_row = row;
-        
-        vport->cur_col++;
-        if (vport->cur_col >= vport->cols) {
-                vport->cur_col = 0;
-                vport->cur_row++;
-                if (vport->cur_row >= vport->rows)
-                        vport->cur_row--;
-        }
-        
-        cursor_show(vport);
-}
-
-/** Draw text data to viewport.
- *
- * @param vport Viewport id
- * @param data  Text data.
- * @param x     Leftmost column of the area.
- * @param y     Topmost row of the area.
- * @param w     Number of rows.
- * @param h     Number of columns.
- *
- */
-static void draw_text_data(viewport_t *vport, keyfield_t *data, unsigned int x,
-    unsigned int y, unsigned int w, unsigned int h)
-{
-        unsigned int i;
-        unsigned int j;
-        bb_cell_t *bbp;
-        attrs_t *a;
-        
-        for (j = 0; j < h; j++) {
-                for (i = 0; i < w; i++) {
-                        unsigned int col = x + i;
-                        unsigned int row = y + j;
-                        
-                        bbp = &vport->backbuf[BB_POS(vport, col, row)];
-                        
-                        a = &data[j * w + i].attrs;
-                        
-                        attr_rgb_t rgb;
-                        rgb.fg_color = 0;
-                        rgb.bg_color = 0;
-                        rgb_from_attr(&rgb, a);
-                        
-                        bbp->glyph = fb_font_glyph(data[j * w + i].character);
-                        bbp->fg_color = rgb.fg_color;
-                        bbp->bg_color = rgb.bg_color;
-                        
-                        draw_vp_glyph(vport, false, col, row);
-                }
-        }
-        cursor_show(vport);
-}
-
-static void putpixel(viewport_t *vport, unsigned int x, unsigned int y,
-    uint32_t color)
-{
-        unsigned int dx = vport->x + x;
-        unsigned int dy = vport->y + y;
-        
-        screen.rgb_conv(&screen.fb_addr[FB_POS(dx, dy)], color);
-}
-
-/** Draw image map
- *
- * @param[in] img       Image map.
- * @param[in] sx        Coordinate of upper left corner.
- * @param[in] sy        Coordinate of upper left corner.
- * @param[in] maxwidth  Maximum allowed width for picture.
- * @param[in] maxheight Maximum allowed height for picture.
- * @param[in] vport     Viewport.
- *
- * @return EOK on success.
- *
- */
-static int imgmap_draw(imgmap_t *img, unsigned int sx, unsigned int sy,
-    unsigned int maxwidth, unsigned int maxheight, void *vport)
-{
-        if (img->visual != VISUAL_BGR_8_8_8)
-                return EINVAL;
-        
-        uint8_t *data = (uint8_t *) img->data;
-        
-        for (sysarg_t y = 0; y < img->height; y++) {
-                for (sysarg_t x = 0; x < img->width; x++) {
-                        if ((x > maxwidth) || (y > maxheight)) {
-                                data += 3;
-                                continue;
-                        }
-                        
-                        uint32_t color = (data[2] << 16) + (data[1] << 8) + data[0];
-                        
-                        putpixel(vport, sx + x, sy + y, color);
-                        data += 3;
-                }
-        }
-        
-        return EOK;
-}
-
-/** Return first free image map
- *
- */
-static int find_free_imgmap(void)
-{
-        unsigned int i;
-        
-        for (i = 0; i < MAX_IMGMAPS; i++)
-                if (!imgmaps[i])
-                        return i;
-        
-        return -1;
-}
-
-/** Create a new image map and return appropriate ID
- *
- */
-static int shm2imgmap(imgmap_t *shm, size_t size)
-{
-        int im = find_free_imgmap();
-        if (im == -1)
-                return ELIMIT;
-        
-        imgmap_t *imap = malloc(size);
-        if (!imap)
-                return ENOMEM;
-        
-        memcpy(imap, shm, size);
-        imgmaps[im] = imap;
-        return im;
-}
-
-/** Handle shared memory communication calls
- *
- * Protocol for drawing image maps:
- * - FB_PREPARE_SHM(client shm identification)
- * - IPC_M_AS_AREA_SEND
- * - FB_DRAW_IMGMAP(startx, starty)
- * - FB_DROP_SHM
- *
- * Protocol for text drawing
- * - IPC_M_AS_AREA_SEND
- * - FB_DRAW_TEXT_DATA
- *
- * @param callid Callid of the current call
- * @param call   Current call data
- * @param vp     Active viewport
- *
- * @return false if the call was not handled byt this function, true otherwise
- *
- * Note: this function is not thread-safe, you would have
- * to redefine static variables with fibril_local.
- *
- */
-static bool shm_handle(ipc_callid_t callid, ipc_call_t *call, int vp)
-{
-        static keyfield_t *interbuffer = NULL;
-        static size_t intersize = 0;
-        
-        static imgmap_t *shm = NULL;
-        static sysarg_t shm_id = 0;
-        static size_t shm_size;
-        
-        bool handled = true;
-        int retval = EOK;
-        viewport_t *vport = &viewports[vp];
-        unsigned int x;
-        unsigned int y;
-        unsigned int w;
-        unsigned int h;
-        
-        switch (IPC_GET_IMETHOD(*call)) {
-        case IPC_M_SHARE_OUT:
-                /* We accept one area for data interchange */
-                if (IPC_GET_ARG1(*call) == shm_id) {
-                        void *dest = as_get_mappable_page(IPC_GET_ARG2(*call));
-                        shm_size = IPC_GET_ARG2(*call);
-                        if (async_answer_1(callid, EOK, (sysarg_t) dest)) {
-                                shm_id = 0;
-                                return false;
-                        }
-                        
-                        shm = dest;
-                        return true;
-                } else {
-                        intersize = IPC_GET_ARG2(*call);
-                        receive_comm_area(callid, call, (void *) &interbuffer);
-                }
-                return true;
-        case FB_PREPARE_SHM:
-                if (shm_id)
-                        retval = EBUSY;
-                else
-                        shm_id = IPC_GET_ARG1(*call);
-                break;
-        case FB_DROP_SHM:
-                if (shm) {
-                        as_area_destroy(shm);
-                        shm = NULL;
-                }
-                shm_id = 0;
-                break;
-        case FB_SHM2IMGMAP:
-                if (!shm) {
-                        retval = EINVAL;
-                        break;
-                }
-                retval = shm2imgmap(shm, shm_size);
-                break;
-        case FB_DRAW_IMGMAP:
-                if (!shm) {
-                        retval = EINVAL;
-                        break;
-                }
-                
-                x = IPC_GET_ARG1(*call);
-                y = IPC_GET_ARG2(*call);
-                
-                if ((x > vport->width) || (y > vport->height)) {
-                        retval = EINVAL;
-                        break;
-                }
-                
-                imgmap_draw(shm, IPC_GET_ARG1(*call), IPC_GET_ARG2(*call),
-                    vport->width - x, vport->height - y, vport);
-                break;
-        case FB_DRAW_TEXT_DATA:
-                x = IPC_GET_ARG1(*call);
-                y = IPC_GET_ARG2(*call);
-                w = IPC_GET_ARG3(*call);
-                h = IPC_GET_ARG4(*call);
-                if (!interbuffer) {
-                        retval = EINVAL;
-                        break;
-                }
-                if (x + w > vport->cols || y + h > vport->rows) {
-                        retval = EINVAL;
-                        break;
-                }
-                if (intersize < w * h * sizeof(*interbuffer)) {
-                        retval = EINVAL;
-                        break;
-                }
-                draw_text_data(vport, interbuffer, x, y, w, h);
-                break;
-        default:
-                handled = false;
-        }
-        
-        if (handled)
-                async_answer_0(callid, retval);
-        
-        return handled;
-}
-
-static void copy_vp_to_imgmap(viewport_t *vport, imgmap_t *imap)
-{
-        unsigned int width = vport->width;
-        unsigned int height = vport->height;
-        
-        if (width + vport->x > screen.xres)
-                width = screen.xres - vport->x;
-        
-        if (height + vport->y > screen.yres)
-                height = screen.yres - vport->y;
-        
-        unsigned int realwidth = imap->width <= width ? imap->width : width;
-        unsigned int realheight = imap->height <= height ? imap->height : height;
-        
-        unsigned int srcrowsize = vport->width * screen.pixelbytes;
-        unsigned int realrowsize = realwidth * screen.pixelbytes;
-        
-        unsigned int y;
-        for (y = 0; y < realheight; y++) {
-                unsigned int tmp = (vport->y + y) * screen.scanline + vport->x * screen.pixelbytes;
-                memcpy(imap->data + srcrowsize * y, screen.fb_addr + tmp, realrowsize);
-        }
-}
-
-/** Save viewport to image map
- *
- */
-static int save_vp_to_imgmap(viewport_t *vport)
-{
-        int im = find_free_imgmap();
-        if (im == -1)
-                return ELIMIT;
-        
-        size_t size = screen.pixelbytes * vport->width * vport->height;
-        imgmap_t *imap = malloc(sizeof(imgmap_t) + size);
-        if (!imap)
-                return ENOMEM;
-        
-        imap->size = sizeof(imgmap_t) + size;
-        imap->width = vport->width;
-        imap->height = vport->height;
-        imap->visual = (visual_t) -1;
-        
-        copy_vp_to_imgmap(vport, imap);
-        imgmaps[im] = imap;
-        return im;
-}
-
-/** Draw image map to screen
- *
- * @param vp Viewport to draw to
- * @param im Image map identifier
- *
- */
-static int draw_imgmap(int vp, int im)
-{
-        imgmap_t *imap = imgmaps[im];
-        if (!imap)
-                return EINVAL;
-        
-        viewport_t *vport = &viewports[vp];
-        
-        unsigned int width = vport->width;
-        unsigned int height = vport->height;
-        
-        if (width + vport->x > screen.xres)
-                width = screen.xres - vport->x;
-        
-        if (height + vport->y > screen.yres)
-                height = screen.yres - vport->y;
-        
-        unsigned int realwidth = imap->width <= width ? imap->width : width;
-        unsigned int realheight = imap->height <= height ? imap->height : height;
-        
-        if (imap->visual == (visual_t) -1) {
-                unsigned int srcrowsize = vport->width * screen.pixelbytes;
-                unsigned int realrowsize = realwidth * screen.pixelbytes;
-                
-                unsigned int y;
-                for (y = 0; y < realheight; y++) {
-                        unsigned int tmp = (vport->y + y) * screen.scanline + vport->x * screen.pixelbytes;
-                        memcpy(screen.fb_addr + tmp, imap->data + y * srcrowsize, realrowsize);
-                }
-        } else
-                imgmap_draw(imap, 0, 0, realwidth, realheight, vport);
-        
-        return EOK;
-}
-
-/** Tick animation one step forward
- *
- */
-static void anims_tick(void)
-{
-        unsigned int i;
-        static int counts = 0;
-        
-        /* Limit redrawing */
-        counts = (counts + 1) % 8;
-        if (counts)
-                return;
-        
-        for (i = 0; i < MAX_ANIMATIONS; i++) {
-                if ((!animations[i].animlen) || (!animations[i].initialized) ||
-                    (!animations[i].enabled))
-                        continue;
-                
-                draw_imgmap(animations[i].vp, animations[i].imgmaps[animations[i].pos]);
-                animations[i].pos = (animations[i].pos + 1) % animations[i].animlen;
-        }
-}
-
-
-static unsigned int pointer_x;
-static unsigned int pointer_y;
-static bool pointer_shown, pointer_enabled;
-static int pointer_vport = -1;
-static int pointer_imgmap = -1;
-
-
-static void mouse_show(void)
-{
-        int i, j;
-        int visibility;
-        int color;
-        int bytepos;
-        
-        if ((pointer_shown) || (!pointer_enabled))
-                return;
-        
-        /* Save image under the pointer. */
-        if (pointer_vport == -1) {
-                pointer_vport = vport_create(pointer_x, pointer_y, pointer_width, pointer_height);
-                if (pointer_vport < 0)
-                        return;
-        } else {
-                viewports[pointer_vport].x = pointer_x;
-                viewports[pointer_vport].y = pointer_y;
-        }
-        
-        if (pointer_imgmap == -1)
-                pointer_imgmap = save_vp_to_imgmap(&viewports[pointer_vport]);
-        else
-                copy_vp_to_imgmap(&viewports[pointer_vport], imgmaps[pointer_imgmap]);
-        
-        /* Draw mouse pointer. */
-        for (i = 0; i < pointer_height; i++)
-                for (j = 0; j < pointer_width; j++) {
-                        bytepos = i * ((pointer_width - 1) / 8 + 1) + j / 8;
-                        visibility = pointer_mask_bits[bytepos] &
-                            (1 << (j % 8));
-                        if (visibility) {
-                                color = pointer_bits[bytepos] &
-                                    (1 << (j % 8)) ? 0 : 0xffffff;
-                                if (pointer_x + j < screen.xres && pointer_y +
-                                    i < screen.yres)
-                                        putpixel(&viewports[0], pointer_x + j,
-                                            pointer_y + i, color);
-                        }
-                }
-        pointer_shown = 1;
-}
-
-
-static void mouse_hide(void)
-{
-        /* Restore image under the pointer. */
-        if (pointer_shown) {
-                draw_imgmap(pointer_vport, pointer_imgmap);
-                pointer_shown = 0;
-        }
-}
-
-
-static void mouse_move(unsigned int x, unsigned int y)
-{
-        mouse_hide();
-        pointer_x = x % screen.xres;
-        pointer_y = y % screen.yres;
-        mouse_show();
-}
-
-
-static int anim_handle(ipc_callid_t callid, ipc_call_t *call, int vp)
-{
-        bool handled = true;
-        int retval = EOK;
-        int i, nvp;
-        int newval;
-        
-        switch (IPC_GET_IMETHOD(*call)) {
-        case FB_ANIM_CREATE:
-                nvp = IPC_GET_ARG1(*call);
-                if (nvp == -1)
-                        nvp = vp;
-                if (nvp >= MAX_VIEWPORTS || nvp < 0 ||
-                        !viewports[nvp].initialized) {
-                        retval = EINVAL;
-                        break;
-                }
-                for (i = 0; i < MAX_ANIMATIONS; i++) {
-                        if (!animations[i].initialized)
-                                break;
-                }
-                if (i == MAX_ANIMATIONS) {
-                        retval = ELIMIT;
-                        break;
-                }
-                animations[i].initialized = 1;
-                animations[i].animlen = 0;
-                animations[i].pos = 0;
-                animations[i].enabled = 0;
-                animations[i].vp = nvp;
-                retval = i;
-                break;
-        case FB_ANIM_DROP:
-                i = IPC_GET_ARG1(*call);
-                if (i >= MAX_ANIMATIONS || i < 0) {
-                        retval = EINVAL;
-                        break;
-                }
-                animations[i].initialized = 0;
-                break;
-        case FB_ANIM_ADDIMGMAP:
-                i = IPC_GET_ARG1(*call);
-                if (i >= MAX_ANIMATIONS || i < 0 ||
-                        !animations[i].initialized) {
-                        retval = EINVAL;
-                        break;
-                }
-                if (animations[i].animlen == MAX_ANIM_LEN) {
-                        retval = ELIMIT;
-                        break;
-                }
-                newval = IPC_GET_ARG2(*call);
-                if (newval < 0 || newval > MAX_IMGMAPS ||
-                        !imgmaps[newval]) {
-                        retval = EINVAL;
-                        break;
-                }
-                animations[i].imgmaps[animations[i].animlen++] = newval;
-                break;
-        case FB_ANIM_CHGVP:
-                i = IPC_GET_ARG1(*call);
-                if (i >= MAX_ANIMATIONS || i < 0) {
-                        retval = EINVAL;
-                        break;
-                }
-                nvp = IPC_GET_ARG2(*call);
-                if (nvp == -1)
-                        nvp = vp;
-                if (nvp >= MAX_VIEWPORTS || nvp < 0 ||
-                        !viewports[nvp].initialized) {
-                        retval = EINVAL;
-                        break;
-                }
-                animations[i].vp = nvp;
-                break;
-        case FB_ANIM_START:
-        case FB_ANIM_STOP:
-                i = IPC_GET_ARG1(*call);
-                if (i >= MAX_ANIMATIONS || i < 0) {
-                        retval = EINVAL;
-                        break;
-                }
-                newval = (IPC_GET_IMETHOD(*call) == FB_ANIM_START);
-                if (newval ^ animations[i].enabled) {
-                        animations[i].enabled = newval;
-                        anims_enabled += newval ? 1 : -1;
-                }
-                break;
-        default:
-                handled = 0;
-        }
-        if (handled)
-                async_answer_0(callid, retval);
-        return handled;
-}
-
-/** Handler for messages concerning image map handling
- *
- */
-static int imgmap_handle(ipc_callid_t callid, ipc_call_t *call, int vp)
-{
-        bool handled = true;
-        int retval = EOK;
-        int i, nvp;
-        
-        switch (IPC_GET_IMETHOD(*call)) {
-        case FB_VP_DRAW_IMGMAP:
-                nvp = IPC_GET_ARG1(*call);
-                if (nvp == -1)
-                        nvp = vp;
-                
-                if (nvp < 0 || nvp >= MAX_VIEWPORTS ||
-                    !viewports[nvp].initialized) {
-                        retval = EINVAL;
-                        break;
-                }
-                
-                i = IPC_GET_ARG2(*call);
-                retval = draw_imgmap(nvp, i);
-                break;
-        case FB_VP2IMGMAP:
-                nvp = IPC_GET_ARG1(*call);
-                if (nvp == -1)
-                        nvp = vp;
-                
-                if (nvp < 0 || nvp >= MAX_VIEWPORTS ||
-                    !viewports[nvp].initialized) {
-                        retval = EINVAL;
-                        break;
-                }
-                
-                retval = save_vp_to_imgmap(&viewports[nvp]);
-                break;
-        case FB_DROP_IMGMAP:
-                i = IPC_GET_ARG1(*call);
-                if (i >= MAX_IMGMAPS) {
-                        retval = EINVAL;
-                        break;
-                }
-                
-                if (imgmaps[i]) {
-                        free(imgmaps[i]);
-                        imgmaps[i] = NULL;
-                }
-                
-                break;
-        default:
-                handled = 0;
-        }
-        
-        if (handled)
-                async_answer_0(callid, retval);
-        return handled;
-        
-}
-
-static int rgb_from_style(attr_rgb_t *rgb, int style)
-{
-        switch (style) {
-        case STYLE_NORMAL:
-                rgb->fg_color = color_table[COLOR_BLACK];
-                rgb->bg_color = color_table[COLOR_WHITE];
-                break;
-        case STYLE_EMPHASIS:
-                rgb->fg_color = color_table[COLOR_RED];
-                rgb->bg_color = color_table[COLOR_WHITE];
-                break;
-        case STYLE_INVERTED:
-                rgb->fg_color = color_table[COLOR_WHITE];
-                rgb->bg_color = color_table[COLOR_BLACK];
-                break;
-        case STYLE_SELECTED:
-                rgb->fg_color = color_table[COLOR_WHITE];
-                rgb->bg_color = color_table[COLOR_RED];
-                break;
-        default:
-                return EINVAL;
-        }
-        
-        return EOK;
-}
-
-static int rgb_from_idx(attr_rgb_t *rgb, sysarg_t fg_color,
-    sysarg_t bg_color, sysarg_t flags)
-{
-        fg_color = (fg_color & 7) | ((flags & CATTR_BRIGHT) ? 8 : 0);
-        bg_color = (bg_color & 7) | ((flags & CATTR_BRIGHT) ? 8 : 0);
-
-        rgb->fg_color = color_table[fg_color];
-        rgb->bg_color = color_table[bg_color];
-
-        return EOK;
-}
-
-static int rgb_from_attr(attr_rgb_t *rgb, const attrs_t *a)
-{
-        int rc;
-
-        switch (a->t) {
-        case at_style:
-                rc = rgb_from_style(rgb, a->a.s.style);
-                break;
-        case at_idx:
-                rc = rgb_from_idx(rgb, a->a.i.fg_color,
-                    a->a.i.bg_color, a->a.i.flags);
-                break;
-        case at_rgb:
-                *rgb = a->a.r;
-                rc = EOK;
-                break;
-        }
-
-        return rc;
-}
-
-static int fb_set_style(viewport_t *vport, sysarg_t style)
-{
-        return rgb_from_style(&vport->attr, (int) style);
-}
-
-static int fb_set_color(viewport_t *vport, sysarg_t fg_color,
-    sysarg_t bg_color, sysarg_t flags)
-{
-        return rgb_from_idx(&vport->attr, fg_color, bg_color, flags);
-}
-
-/** Function for handling connections to FB
- *
- */
-static void fb_client_connection(ipc_callid_t iid, ipc_call_t *icall,
-    void *arg)
-{
-        unsigned int vp = 0;
-        viewport_t *vport = &viewports[vp];
-        
-        if (client_connected) {
-                async_answer_0(iid, ELIMIT);
-                return;
-        }
-        
-        /* Accept connection */
-        client_connected = true;
-        async_answer_0(iid, EOK);
-        
-        while (true) {
-                ipc_callid_t callid;
-                ipc_call_t call;
-                int retval;
-                unsigned int i;
-                int scroll;
-                wchar_t ch;
-                unsigned int col, row;
-                
-                if ((vport->cursor_active) || (anims_enabled))
-                        callid = async_get_call_timeout(&call, 250000);
-                else
-                        callid = async_get_call(&call);
-                
-                mouse_hide();
-                if (!callid) {
-                        cursor_blink(vport);
-                        anims_tick();
-                        mouse_show();
-                        continue;
-                }
-                
-                if (shm_handle(callid, &call, vp))
-                        continue;
-                
-                if (imgmap_handle(callid, &call, vp))
-                        continue;
-                
-                if (anim_handle(callid, &call, vp))
-                        continue;
-                
-                if (!IPC_GET_IMETHOD(call)) {
-                        client_connected = false;
-                        
-                        /* Cleanup other viewports */
-                        for (i = 1; i < MAX_VIEWPORTS; i++)
-                                vport->initialized = false;
-                        
-                        /* Exit thread */
-                        return;
                 }
                 
                 switch (IPC_GET_IMETHOD(call)) {
-                case FB_PUTCHAR:
-                        ch = IPC_GET_ARG1(call);
-                        col = IPC_GET_ARG2(call);
-                        row = IPC_GET_ARG3(call);
-                        
-                        if ((col >= vport->cols) || (row >= vport->rows)) {
-                                retval = EINVAL;
-                                break;
-                        }
-                        async_answer_0(callid, EOK);
-                        
-                        draw_char(vport, ch, col, row);
-                        
-                        /* Message already answered */
-                        continue;
-                case FB_CLEAR:
-                        vport_clear(vport);
-                        cursor_show(vport);
-                        retval = EOK;
-                        break;
-                case FB_CURSOR_GOTO:
-                        col = IPC_GET_ARG1(call);
-                        row = IPC_GET_ARG2(call);
-                        
-                        if ((col >= vport->cols) || (row >= vport->rows)) {
-                                retval = EINVAL;
-                                break;
-                        }
-                        retval = EOK;
-                        
-                        cursor_hide(vport);
-                        vport->cur_col = col;
-                        vport->cur_row = row;
-                        cursor_show(vport);
-                        break;
-                case FB_CURSOR_VISIBILITY:
-                        cursor_hide(vport);
-                        vport->cursor_active = IPC_GET_ARG1(call);
-                        cursor_show(vport);
-                        retval = EOK;
-                        break;
-                case FB_GET_CSIZE:
-                        async_answer_2(callid, EOK, vport->cols, vport->rows);
-                        continue;
-                case FB_GET_COLOR_CAP:
-                        async_answer_1(callid, EOK, FB_CCAP_RGB);
-                        continue;
-                case FB_SCROLL:
-                        scroll = IPC_GET_ARG1(call);
-                        if ((scroll > (int) vport->rows) || (scroll < (-(int) vport->rows))) {
-                                retval = EINVAL;
-                                break;
-                        }
-                        cursor_hide(vport);
-                        vport_scroll(vport, scroll);
-                        cursor_show(vport);
-                        retval = EOK;
-                        break;
-                case FB_VIEWPORT_SWITCH:
-                        i = IPC_GET_ARG1(call);
-                        if (i >= MAX_VIEWPORTS) {
-                                retval = EINVAL;
-                                break;
-                        }
-                        if (!viewports[i].initialized) {
-                                retval = EADDRNOTAVAIL;
-                                break;
-                        }
-                        cursor_hide(vport);
-                        vp = i;
-                        vport = &viewports[vp];
-                        cursor_show(vport);
-                        retval = EOK;
-                        break;
-                case FB_VIEWPORT_CREATE:
-                        retval = vport_create(IPC_GET_ARG1(call) >> 16,
-                            IPC_GET_ARG1(call) & 0xffff,
-                            IPC_GET_ARG2(call) >> 16,
-                            IPC_GET_ARG2(call) & 0xffff);
-                        break;
-                case FB_VIEWPORT_DELETE:
-                        i = IPC_GET_ARG1(call);
-                        if (i >= MAX_VIEWPORTS) {
-                                retval = EINVAL;
-                                break;
-                        }
-                        if (!viewports[i].initialized) {
-                                retval = EADDRNOTAVAIL;
-                                break;
-                        }
-                        viewports[i].initialized = false;
-                        if (viewports[i].bgpixel)
-                                free(viewports[i].bgpixel);
-                        if (viewports[i].backbuf)
-                                free(viewports[i].backbuf);
-                        retval = EOK;
-                        break;
-                case FB_SET_STYLE:
-                        retval = fb_set_style(vport, IPC_GET_ARG1(call));
-                        break;
-                case FB_SET_COLOR:
-                        retval = fb_set_color(vport, IPC_GET_ARG1(call),
-                            IPC_GET_ARG2(call), IPC_GET_ARG3(call));
-                        break;
-                case FB_SET_RGB_COLOR:
-                        vport->attr.fg_color = IPC_GET_ARG1(call);
-                        vport->attr.bg_color = IPC_GET_ARG2(call);
-                        retval = EOK;
-                        break;
-                case FB_GET_RESOLUTION:
-                        async_answer_2(callid, EOK, screen.xres, screen.yres);
-                        continue;
-                case FB_POINTER_MOVE:
-                        pointer_enabled = true;
-                        mouse_move(IPC_GET_ARG1(call), IPC_GET_ARG2(call));
-                        retval = EOK;
-                        break;
-                case FB_SCREEN_YIELD:
-                case FB_SCREEN_RECLAIM:
-                        retval = EOK;
-                        break;
-                default:
-                        retval = ENOENT;
-                }
-                async_answer_0(callid, retval);
-        }
-}
-
-/** Initialization of framebuffer
- *
- */
-int fb_init(void)
-{
-        async_set_client_connection(fb_client_connection);
-        
-        sysarg_t fb_ph_addr;
-        if (sysinfo_get_value("fb.address.physical", &fb_ph_addr) != EOK)
-                return -1;
-        
-        sysarg_t fb_offset;
-        if (sysinfo_get_value("fb.offset", &fb_offset) != EOK)
-                fb_offset = 0;
-        
-        sysarg_t fb_width;
-        if (sysinfo_get_value("fb.width", &fb_width) != EOK)
-                return -1;
-        
-        sysarg_t fb_height;
-        if (sysinfo_get_value("fb.height", &fb_height) != EOK)
-                return -1;
-        
-        sysarg_t fb_scanline;
-        if (sysinfo_get_value("fb.scanline", &fb_scanline) != EOK)
-                return -1;
-        
-        sysarg_t fb_visual;
-        if (sysinfo_get_value("fb.visual", &fb_visual) != EOK)
-                return -1;
-        
-        sysarg_t fbsize = fb_scanline * fb_height;
-        void *fb_addr = as_get_mappable_page(fbsize);
-        
-        if (physmem_map((void *) fb_ph_addr + fb_offset, fb_addr,
-            ALIGN_UP(fbsize, PAGE_SIZE) >> PAGE_WIDTH, AS_AREA_READ | AS_AREA_WRITE) != 0)
-                return -1;
-        
-        if (screen_init(fb_addr, fb_width, fb_height, fb_scanline, fb_visual))
-                return 0;
-        
-        return -1;
-}
-
-/**
- * @}
- */
+                        
+                        /* Screen methods */
+                        
+                        case FB_GET_RESOLUTION:
+                                fbsrv_get_resolution(dev, callid, &call);
+                                break;
+                        case FB_YIELD:
+                                fbsrv_yield(dev, callid, &call);
+                                break;
+                        case FB_CLAIM:
+                                fbsrv_claim(dev, callid, &call);
+                                break;
+                        case FB_POINTER_UPDATE:
+                                fbsrv_pointer_update(dev, callid, &call);
+                                break;
+                        
+                        /* Object methods */
+                        
+                        case FB_VP_CREATE:
+                                fbsrv_vp_create(dev, callid, &call);
+                                break;
+                        case FB_VP_DESTROY:
+                                fbsrv_vp_destroy(dev, callid, &call);
+                                break;
+                        case FB_FRONTBUF_CREATE:
+                                fbsrv_frontbuf_create(dev, callid, &call);
+                                break;
+                        case FB_FRONTBUF_DESTROY:
+                                fbsrv_frontbuf_destroy(dev, callid, &call);
+                                break;
+                        case FB_IMAGEMAP_CREATE:
+                                fbsrv_imagemap_create(dev, callid, &call);
+                                break;
+                        case FB_IMAGEMAP_DESTROY:
+                                fbsrv_imagemap_destroy(dev, callid, &call);
+                                break;
+                        case FB_SEQUENCE_CREATE:
+                                fbsrv_sequence_create(dev, callid, &call);
+                                break;
+                        case FB_SEQUENCE_DESTROY:
+                                fbsrv_sequence_destroy(dev, callid, &call);
+                                break;
+                        case FB_SEQUENCE_ADD_IMAGEMAP:
+                                fbsrv_sequence_add_imagemap(dev, callid, &call);
+                                break;
+                        
+                        /* Viewport stateful methods */
+                        
+                        case FB_VP_FOCUS:
+                                fbsrv_vp_focus(dev, callid, &call);
+                                break;
+                        case FB_VP_CLEAR:
+                                fbsrv_vp_clear(dev, callid, &call);
+                                break;
+                        case FB_VP_GET_DIMENSIONS:
+                                fbsrv_vp_get_dimensions(dev, callid, &call);
+                                break;
+                        case FB_VP_GET_CAPS:
+                                fbsrv_vp_get_caps(dev, callid, &call);
+                                break;
+                        
+                        /* Style methods (viewport specific) */
+                        
+                        case FB_VP_CURSOR_UPDATE:
+                                fbsrv_vp_cursor_update(dev, callid, &call);
+                                break;
+                        case FB_VP_SET_STYLE:
+                                fbsrv_vp_set_style(dev, callid, &call);
+                                break;
+                        case FB_VP_SET_COLOR:
+                                fbsrv_vp_set_color(dev, callid, &call);
+                                break;
+                        case FB_VP_SET_RGB_COLOR:
+                                fbsrv_vp_set_rgb_color(dev, callid, &call);
+                                break;
+                        
+                        /* Text output methods (viewport specific) */
+                        
+                        case FB_VP_PUTCHAR:
+                                fbsrv_vp_putchar(dev, callid, &call);
+                                break;
+                        case FB_VP_UPDATE:
+                                fbsrv_vp_update(dev, callid, &call);
+                                break;
+                        case FB_VP_DAMAGE:
+                                fbsrv_vp_damage(dev, callid, &call);
+                                break;
+                        
+                        /* Image map methods (viewport specific) */
+                        
+                        case FB_VP_IMAGEMAP_DAMAGE:
+                                fbsrv_vp_imagemap_damage(dev, callid, &call);
+                                break;
+                        
+                        /* Sequence methods (viewport specific) */
+                        
+                        case FB_VP_SEQUENCE_START:
+                                fbsrv_vp_sequence_start(dev, callid, &call);
+                                break;
+                        case FB_VP_SEQUENCE_STOP:
+                                fbsrv_vp_sequence_stop(dev, callid, &call);
+                                break;
+                        
+                        default:
+                                async_answer_0(callid, EINVAL);
+                }
+        }
+}
+
+int main(int argc, char *argv[])
+{
+        printf("%s: HelenOS framebuffer service\n", NAME);
+        
+        /* Register server */
+        int rc = loc_server_register(NAME, client_connection);
+        if (rc != EOK) {
+                printf("%s: Unable to register driver (%d)\n", NAME, rc);
+                return 1;
+        }
+        
+        ega_init();
+        kchar_init();
+        kfb_init();
+        niagara_init();
+        ski_init();
+        
+        printf("%s: Accepting connections\n", NAME);
+        task_retval(0);
+        async_manager();
+        
+        /* Never reached */
+        return 0;
+}