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/*

 * Copyright (c) 2008 Martin Decky

 * Copyright (c) 2006 Jakub Vana

 * Copyright (c) 2006 Ondrej Palkovsky

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/**

 * @defgroup fb Graphical framebuffer

 * @brief	HelenOS graphical framebuffer.

 * @ingroup fbs

 * @{

 */

/** @file

 */

#include <stdlib.h>

#include <unistd.h>

#include <string.h>

#include <ddi.h>

#include <sysinfo.h>

#include <align.h>

#include <as.h>

#include <ipc/fb.h>

#include <ipc/ipc.h>

#include <ipc/ns.h>

#include <ipc/services.h>

#include <kernel/errno.h>

#include <kernel/genarch/fb/visuals.h>

#include <async.h>

#include <bool.h>

#include "font-8x16.h"

#include "fb.h"

#include "main.h"

#include "../console/screenbuffer.h"

#include "ppm.h"

#include "pointer.xbm"

#include "pointer_mask.xbm"

#define DEFAULT_BGCOLOR  0xf0f0f0

#define DEFAULT_FGCOLOR  0x000000

#define MAX_ANIM_LEN     8

#define MAX_ANIMATIONS   4

#define MAX_PIXMAPS      256  /**< Maximum number of saved pixmaps */

#define MAX_VIEWPORTS    128  /**< Viewport is a rectangular area on the screen */

typedef void (*rgb_conv_t)(void *, uint32_t);

struct {

	uint8_t *fb_addr;

	unsigned int xres;

	unsigned int yres;

	unsigned int scanline;

	unsigned int glyphscanline;

	unsigned int pixelbytes;

	unsigned int glyphbytes;

	rgb_conv_t rgb_conv;

} screen;

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;

	/* Style and glyphs for text printing */

	style_t style;

	uint8_t *glyphs;

	uint8_t *bgpixel;

	/* Auto-cursor position */

	bool cursor_active;

	unsigned int cur_col;

	unsigned int cur_row;

	bool cursor_shown;

	/* Back buffer */

	unsigned int bbsize;

	uint8_t *backbuf;

} viewport_t;

typedef struct {

	bool initialized;

	bool enabled;

	unsigned int vp;

	unsigned int pos;

	unsigned int animlen;

	unsigned int pixmaps[MAX_ANIM_LEN];

} animation_t;

static animation_t animations[MAX_ANIMATIONS];

static bool anims_enabled;

typedef struct {

	unsigned int width;

	unsigned int height;

	uint8_t *data;

} pixmap_t;

static pixmap_t pixmaps[MAX_PIXMAPS];

static viewport_t viewports[128];

static bool client_connected = false;  /**< Allow only 1 connection */

static void draw_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)

/** ARGB 8:8:8:8 conversion

 *

 */

static void rgb_0888(void *dst, uint32_t rgb)

{

	*((uint32_t *) dst) = rgb & 0xffffff;

}

/** ABGR 8:8:8:8 conversion

 *

 */

static void bgr_0888(void *dst, uint32_t rgb)

{

	*((uint32_t *) dst)

	    = (BLUE(rgb, 8) << 16) | (GREEN(rgb, 8) << 8) | RED(rgb, 8);

}

/** BGR 8:8:8 conversion

 *

 */

static void rgb_888(void *dst, uint32_t rgb)

{

#if defined(FB_INVERT_ENDIAN)

	((uint8_t *) dst)[0] = RED(rgb, 8);

	((uint8_t *) dst)[1] = GREEN(rgb, 8);

	((uint8_t *) dst)[2] = BLUE(rgb, 8);

#else

	((uint8_t *) dst)[0] = BLUE(rgb, 8);

	((uint8_t *) dst)[1] = GREEN(rgb, 8);

	((uint8_t *) dst)[2] = RED(rgb, 8);

#endif

}

/** RGB 5:5:5 conversion

 *

 */

static void rgb_555(void *dst, uint32_t rgb)

{

	*((uint16_t *) dst)

	    = (RED(rgb, 5) << 10) | (GREEN(rgb, 5) << 5) | BLUE(rgb, 5);

}

/** RGB 5:6:5 conversion

 *

 */

static void rgb_565(void *dst, uint32_t rgb)

{

	*((uint16_t *) dst)

	    = (RED(rgb, 5) << 11) | (GREEN(rgb, 6) << 5) | BLUE(rgb, 5);

}

/** RGB 3:2:3

 *

 */

static void rgb_323(void *dst, uint32_t rgb)

{

	*((uint8_t *) dst)

	    = ~((RED(rgb, 3) << 5) | (GREEN(rgb, 2) << 3) | BLUE(rgb, 3));

}

/** 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, y;

	unsigned int copy_bytes;

	uint8_t *sp, *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 row, col;

	for (row = 0; row < vport->rows; row++) {

		for (col = 0; col < vport->cols; col++) {

			draw_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->style.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->style.bg_color);

	}

}

/** Clear viewport.

 *

 * @param vport Viewport to clear

 *

 */

static void vport_clear(viewport_t *vport)

{

	memset(vport->backbuf, 0, vport->bbsize);

	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)

{

	/*

	 * Scroll backbuffer.

	 */

	if (lines > 0) {

		memmove(vport->backbuf, vport->backbuf + vport->cols * lines,

		    vport->cols * (vport->rows - lines));

		memset(&vport->backbuf[BB_POS(vport, 0, vport->rows - lines)],

		    0, vport->cols * lines);

	} else {

		memmove(vport->backbuf - vport->cols * lines, vport->backbuf,

		    vport->cols * (vport->rows + lines));

		memset(vport->backbuf, 0, - vport->cols * lines);

	}

	/* 

	 * Scroll pixels.

	 */

	unsigned int dist, height, alines;

	unsigned int y, ry;

	uint8_t *sp, *dp;

	alines = lines > 0 ? lines : -lines;

	dist = alines * FONT_SCANLINES;

	height = (vport->rows - alines) * FONT_SCANLINES;

	if (lines > 0) {

		dp = &screen.fb_addr[FB_POS(vport->x, vport->y + 0)];

		sp = &screen.fb_addr[FB_POS(vport->x, vport->y + dist)];

		ry = height;

	} else {

		dp = &screen.fb_addr[FB_POS(vport->x, vport->y + dist)];

		sp = &screen.fb_addr[FB_POS(vport->x, vport->y + 0)];

		ry = 0;

	}

	/* Move pixels line by line. */

	for (y = 0; y < height; y++) {

		memcpy(dp, sp, vport->cols * FONT_WIDTH

		    * screen.pixelbytes);

		sp += screen.scanline;

		dp += screen.scanline;

	}

	/* Fill emptied area with background color. */

	draw_filled_rect(vport->x, vport->y + ry,

	    vport->x + COL2X(vport->cols), vport->y + ry + dist,

	    vport->style.bg_color);

}

/** Render glyphs

 *

 * Convert glyphs from device independent font

 * description to current visual representation.

 *

 * @param vport Viewport

 *

 */

static void render_glyphs(viewport_t* vport)

{

	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.rgb_conv(&vport->glyphs[GLYPH_POS(glyph, y, false) + x * screen.pixelbytes],

				    (fb_font[glyph * FONT_SCANLINES + y] & (1 << (7 - x)))

				    ? vport->style.fg_color : vport->style.bg_color);

				uint32_t curcolor;

				if (y < FONT_SCANLINES - 2)

					curcolor =

					    (fb_font[glyph * FONT_SCANLINES + y] & (1 << (7 - x)))

					    ? vport->style.fg_color : vport->style.bg_color;

				else

					curcolor = vport->style.fg_color;

				screen.rgb_conv(&vport->glyphs[GLYPH_POS(glyph, y, true) + x * screen.pixelbytes], curcolor);

			}

		}

	}

	screen.rgb_conv(vport->bgpixel, vport->style.bg_color);

}

/** 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)

			break;

	}

	if (i == MAX_VIEWPORTS)

		return ELIMIT;

	unsigned int cols = width / FONT_WIDTH;

	unsigned int rows = height / FONT_SCANLINES;

	unsigned int bbsize = cols * rows;

	unsigned int glyphsize = 2 * FONT_GLYPHS * screen.glyphbytes;

	uint8_t *backbuf = (uint8_t *) malloc(bbsize);

	if (!backbuf)

		return ENOMEM;

	uint8_t *glyphs = (uint8_t *) malloc(glyphsize);

	if (!glyphs) {

		free(backbuf);

		return ENOMEM;

	}

	uint8_t *bgpixel = (uint8_t *) malloc(screen.pixelbytes);

	if (!bgpixel) {

		free(glyphs);

		free(backbuf);

		return ENOMEM;

	}

	memset(backbuf, 0, bbsize);

	memset(glyphs, 0, glyphsize);

	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].style.bg_color = DEFAULT_BGCOLOR;

	viewports[i].style.fg_color = DEFAULT_FGCOLOR;

	viewports[i].glyphs = glyphs;

	viewports[i].bgpixel = bgpixel;

	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;

	render_glyphs(&viewports[i]);

	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 = rgb_323;

		screen.pixelbytes = 1;

		break;

	case VISUAL_RGB_5_5_5:

		screen.rgb_conv = rgb_555;

		screen.pixelbytes = 2;

		break;

	case VISUAL_RGB_5_6_5:

		screen.rgb_conv = rgb_565;

		screen.pixelbytes = 2;

		break;

	case VISUAL_RGB_8_8_8:

		screen.rgb_conv = rgb_888;

		screen.pixelbytes = 3;

		break;

	case VISUAL_RGB_8_8_8_0:

		screen.rgb_conv = rgb_888;

		screen.pixelbytes = 4;

		break;

	case VISUAL_RGB_0_8_8_8:

		screen.rgb_conv = rgb_0888;

		screen.pixelbytes = 4;

		break;

	case VISUAL_BGR_0_8_8_8:

		screen.rgb_conv = bgr_0888;

		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;

	/* Create first viewport */

	vport_create(0, 0, xres, yres);

	return true;

}

/** Draw glyph at given position relative to 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_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);

	unsigned int yd;

	uint8_t glyph = vport->backbuf[BB_POS(vport, col, row)];

	for (yd = 0; yd < FONT_SCANLINES; yd++)

		memcpy(&screen.fb_addr[FB_POS(x, y + yd)],

		    &vport->glyphs[GLYPH_POS(glyph, yd, cursor)], screen.glyphscanline);

}

/** Hide cursor if it is shown

 *

 */

static void cursor_hide(viewport_t *vport)

{

	if ((vport->cursor_active) && (vport->cursor_shown)) {

		draw_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_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, uint8_t c, unsigned int col, unsigned int row)

{

	/* 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);

	vport->backbuf[BB_POS(vport, col, row)] = c;

	draw_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 fitting exactly into viewport

 *

 */

static void draw_text_data(viewport_t *vport, keyfield_t *data)

{

	unsigned int i;

	for (i = 0; i < vport->cols * vport->rows; i++) {

		unsigned int col = i % vport->cols;

		unsigned int row = i / vport->cols;

		uint8_t glyph = vport->backbuf[BB_POS(vport, col, row)];

		// TODO: use data[i].style

		if (glyph != data[i].character) {

			vport->backbuf[BB_POS(vport, col, row)] = data[i].character;

			draw_glyph(vport, false, col, row);

		}

	}

	cursor_show(vport);

}

static void putpixel_pixmap(void *data, unsigned int x, unsigned int y, uint32_t color)

{

	int pm = *((int *) data);

	pixmap_t *pmap = &pixmaps[pm];

	unsigned int pos = (y * pmap->width + x) * screen.pixelbytes;

	screen.rgb_conv(&pmap->data[pos], color);

}

static void putpixel(void *data, unsigned int x, unsigned int y, uint32_t color)

{

	viewport_t *vport = (viewport_t *) data;

	unsigned int dx = vport->x + x;

	unsigned int dy = vport->y + y;

	screen.rgb_conv(&screen.fb_addr[FB_POS(dx, dy)], color);

}

/** Return first free pixmap

 *

 */

static int find_free_pixmap(void)

{

	unsigned int i;

	for (i = 0; i < MAX_PIXMAPS; i++)

		if (!pixmaps[i].data)

			return i;

	return -1;

}

/** Create a new pixmap and return appropriate ID

 *

 */

static int shm2pixmap(unsigned char *shm, size_t size)

{

	int pm;

	pixmap_t *pmap;

	pm = find_free_pixmap();

	if (pm == -1)

		return ELIMIT;

	pmap = &pixmaps[pm];

	if (ppm_get_data(shm, size, &pmap->width, &pmap->height))

		return EINVAL;

	pmap->data = malloc(pmap->width * pmap->height * screen.pixelbytes);

	if (!pmap->data)

		return ENOMEM;

	ppm_draw(shm, size, 0, 0, pmap->width, pmap->height, putpixel_pixmap, (void *) &pm);

	return pm;

}

/** Handle shared memory communication calls

 *

 * Protocol for drawing pixmaps:

 * - FB_PREPARE_SHM(client shm identification)

 * - IPC_M_AS_AREA_SEND

 * - FB_DRAW_PPM(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 threads safe, you would have

 * to redefine static variables with __thread

 *

 */

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 unsigned char *shm = NULL;

	static ipcarg_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;

	switch (IPC_GET_METHOD(*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 (!ipc_answer_1(callid, EOK, (sysarg_t) dest))

				shm = dest;

			else

				shm_id = 0;

			if (shm[0] != 'P')

				return false;

			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_SHM2PIXMAP:

		if (!shm) {

			retval = EINVAL;

			break;

		}

		retval = shm2pixmap(shm, shm_size);

		break;

	case FB_DRAW_PPM:

		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;

		}

		ppm_draw(shm, shm_size, IPC_GET_ARG1(*call),

		    IPC_GET_ARG2(*call), vport->width - x, vport->height - y, putpixel, (void *) vport);

		break;

	case FB_DRAW_TEXT_DATA:

		if (!interbuffer) {

			retval = EINVAL;

			break;

		}

		if (intersize < vport->cols * vport->rows * sizeof(*interbuffer)) {

			retval = EINVAL;

			break;

		}

		draw_text_data(vport, interbuffer);

		break;

	default:

		handled = false;

	}

	if (handled)

		ipc_answer_0(callid, retval);

	return handled;

}

static void copy_vp_to_pixmap(viewport_t *vport, pixmap_t *pmap)

{

	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 = pmap->width <= width ? pmap->width : width;

	unsigned int realheight = pmap->height <= height ? pmap->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(pmap->data + srcrowsize * y, screen.fb_addr + tmp, realrowsize);

	}

}

/** Save viewport to pixmap

 *

 */

static int save_vp_to_pixmap(viewport_t *vport)

{

	int pm;

	pixmap_t *pmap;

	pm = find_free_pixmap();

	if (pm == -1)

		return ELIMIT;

	pmap = &pixmaps[pm];

	pmap->data = malloc(screen.pixelbytes * vport->width * vport->height);

	if (!pmap->data)

		return ENOMEM;

	pmap->width = vport->width;

	pmap->height = vport->height;

	copy_vp_to_pixmap(vport, pmap);

	return pm;

}

/** Draw pixmap on screen

 *

 * @param vp Viewport to draw on

 * @param pm Pixmap identifier

 *

 */

static int draw_pixmap(int vp, int pm)

{

	pixmap_t *pmap = &pixmaps[pm];

	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;

	if (!pmap->data)

		return EINVAL;

	unsigned int realwidth = pmap->width <= width ? pmap->width : width;

	unsigned int realheight = pmap->height <= height ? pmap->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(screen.fb_addr + tmp, pmap->data + y * srcrowsize, realrowsize);

	}

	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_pixmap(animations[i].vp, animations[i].pixmaps[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_pixmap = -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_pixmap == -1)

		pointer_pixmap = save_vp_to_pixmap(&viewports[pointer_vport]);

	else

		copy_vp_to_pixmap(&viewports[pointer_vport], &pixmaps[pointer_pixmap]);

	/* 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_pixmap(pointer_vport, pointer_pixmap);

		pointer_shown = 0;

	}

}

static void mouse_move(unsigned int x, unsigned int y)

{

	mouse_hide();

	pointer_x = x;

	pointer_y = y;

	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_METHOD(*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_ADDPIXMAP:

		i = IPC_GET_ARG1(*call);

		if (i >= MAX_ANIMATIONS || i < 0 ||

			!animations[i].initialized) {

			retval = EINVAL;