source: mainline/fb/fb.c@ a805c24

/*
 * 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.
 */

#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 <async.h>

#include "font-8x16.h"
#include "helenos.xbm"
#include "fb.h"
#include "main.h"
#include "../console/screenbuffer.h"

#define DEFAULT_BGCOLOR                0x000080
#define DEFAULT_FGCOLOR                0xffff00

/***************************************************************/
/* Pixel specific fuctions */

typedef void (*putpixel_fn_t)(unsigned int x, unsigned int y, int color);
typedef int (*getpixel_fn_t)(unsigned int x, unsigned int y);

struct {
        __u8 *fbaddress ;

        unsigned int xres ;
        unsigned int yres ;
        unsigned int scanline ;
        unsigned int pixelbytes ;

        putpixel_fn_t putpixel;
        getpixel_fn_t getpixel;
} screen;

typedef struct {
        int initialized;
        unsigned int x, y;
        unsigned int width, height;

        /* Text support in window */
        unsigned int rows, cols;
        /* Style for text printing */
        style_t style;
        /* Auto-cursor position */
        int cursor_active, cur_col, cur_row;
        int cursor_shown;
} viewport_t;

#define MAX_VIEWPORTS 128
static viewport_t viewports[128];

/* Allow only 1 connection */
static int client_connected = 0;

#define RED(x, bits)    ((x >> (16 + 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 COL_WIDTH       8
#define ROW_BYTES       (screen.scanline * FONT_SCANLINES)

#define POINTPOS(x, y)  ((y) * screen.scanline + (x) * screen.pixelbytes)

/** Put pixel - 24-bit depth, 1 free byte */
static void putpixel_4byte(unsigned int x, unsigned int y, int color)
{
        *((__u32 *)(screen.fbaddress + POINTPOS(x, y))) = color;
}

/** Return pixel color - 24-bit depth, 1 free byte */
static int getpixel_4byte(unsigned int x, unsigned int y)
{
        return *((__u32 *)(screen.fbaddress + POINTPOS(x, y))) & 0xffffff;
}

/** Put pixel - 24-bit depth */
static void putpixel_3byte(unsigned int x, unsigned int y, int color)
{
        unsigned int startbyte = POINTPOS(x, y);

#if (defined(BIG_ENDIAN) || defined(FB_BIG_ENDIAN))
        screen.fbaddress[startbyte] = RED(color, 8);
        screen.fbaddress[startbyte + 1] = GREEN(color, 8);
        screen.fbaddress[startbyte + 2] = BLUE(color, 8);
#else
        screen.fbaddress[startbyte + 2] = RED(color, 8);
        screen.fbaddress[startbyte + 1] = GREEN(color, 8);
        screen.fbaddress[startbyte + 0] = BLUE(color, 8);
#endif

}

/** Return pixel color - 24-bit depth */
static int getpixel_3byte(unsigned int x, unsigned int y)
{
        unsigned int startbyte = POINTPOS(x, y);



#if (defined(BIG_ENDIAN) || defined(FB_BIG_ENDIAN))
        return screen.fbaddress[startbyte] << 16 | screen.fbaddress[startbyte + 1] << 8 | screen.fbaddress[startbyte + 2];
#else
        return screen.fbaddress[startbyte + 2] << 16 | screen.fbaddress[startbyte + 1] << 8 | screen.fbaddress[startbyte + 0];
#endif
                                                                

}

/** Put pixel - 16-bit depth (5:6:5) */
static void putpixel_2byte(unsigned int x, unsigned int y, int color)
{
        /* 5-bit, 6-bits, 5-bits */ 
        *((__u16 *)(screen.fbaddress + POINTPOS(x, y))) = RED(color, 5) << 11 | GREEN(color, 6) << 5 | BLUE(color, 5);
}

/** Return pixel color - 16-bit depth (5:6:5) */
static int getpixel_2byte(unsigned int x, unsigned int y)
{
        int color = *((__u16 *)(screen.fbaddress + POINTPOS(x, y)));
        return (((color >> 11) & 0x1f) << (16 + 3)) | (((color >> 5) & 0x3f) << (8 + 2)) | ((color & 0x1f) << 3);
}

/** Put pixel - 8-bit depth (3:2:3) */
static void putpixel_1byte(unsigned int x, unsigned int y, int color)
{
        screen.fbaddress[POINTPOS(x, y)] = RED(color, 3) << 5 | GREEN(color, 2) << 3 | BLUE(color, 3);
}

/** Return pixel color - 8-bit depth (3:2:3) */
static int getpixel_1byte(unsigned int x, unsigned int y)
{
        int color = screen.fbaddress[POINTPOS(x, y)];
        return (((color >> 5) & 0x7) << (16 + 5)) | (((color >> 3) & 0x3) << (8 + 6)) | ((color & 0x7) << 5);
}

/** Put pixel into viewport 
 *
 * @param vp Viewport identification
 * @param x X coord relative to viewport
 * @param y Y coord relative to viewport
 * @param color RGB color 
 */
static void putpixel(int vp, unsigned int x, unsigned int y, int color)
{
        screen.putpixel(viewports[vp].x + x, viewports[vp].y + y, color);
}
/** Get pixel from viewport */
static int getpixel(int vp, unsigned int x, unsigned int y)
{
        return screen.getpixel(viewports[vp].x + x, viewports[vp].y + y);
}

/** Fill line with color BGCOLOR */
static void clear_line(int vp, unsigned int y)
{
        unsigned int x;
        for (x = 0; x < viewports[vp].width; x++)
                putpixel(vp, x, y, viewports[vp].style.bg_color);
}

/** Fill viewport with background color */
static void clear_port(int vp)
{
        unsigned int y;

        clear_line(vp, 0);
        for (y = viewports[vp].y+1; y < viewports[vp].y+viewports[vp].height; y++) {
                memcpy(&screen.fbaddress[POINTPOS(viewports[vp].x,y)],
                       &screen.fbaddress[POINTPOS(viewports[vp].x,viewports[vp].y)],
                       screen.pixelbytes * viewports[vp].width);
        }       
}

/** Scroll port up/down 
 *
 * @param vp Viewport to scroll
 * @param rows Positive number - scroll up, negative - scroll down
 */
static void scroll_port(int vp, int rows)
{
        int y;
        int startline;
        int endline;
        
        if (rows > 0) {
                for (y=viewports[vp].y; y < viewports[vp].y+viewports[vp].height - rows*FONT_SCANLINES; y++)
                        memcpy(&screen.fbaddress[POINTPOS(viewports[vp].x,y)],
                               &screen.fbaddress[POINTPOS(viewports[vp].x,y + rows*FONT_SCANLINES)],
                               screen.pixelbytes * viewports[vp].width);
                /* Clear last row */
                startline = viewports[vp].y+FONT_SCANLINES*(viewports[vp].rows-1);
                endline = viewports[vp].y + viewports[vp].height;
                clear_line(vp, startline);
                for (y=startline+1;y < endline; y++)
                        memcpy(&screen.fbaddress[POINTPOS(viewports[vp].x,y)],
                               &screen.fbaddress[POINTPOS(viewports[vp].x,startline)],
                               screen.pixelbytes * viewports[vp].width);
                              
        } else if (rows < 0) {
                rows = -rows;
                for (y=viewports[vp].y + viewports[vp].height-1; y >= viewports[vp].y + rows*FONT_SCANLINES; y--)
                        memcpy(&screen.fbaddress[POINTPOS(viewports[vp].x,y)],
                                &screen.fbaddress[POINTPOS(viewports[vp].x,y - rows*FONT_SCANLINES)],
                                screen.pixelbytes * viewports[vp].width);
                /* Clear first row */
                clear_line(0, viewports[vp].style.bg_color);
                for (y=1;y < rows*FONT_SCANLINES; y++)
                        memcpy(&screen.fbaddress[POINTPOS(viewports[vp].x,viewports[vp].y+y)],
                               &screen.fbaddress[POINTPOS(viewports[vp].x,viewports[vp].y)],
                               screen.pixelbytes * viewports[vp].width);
        }
}

static void invert_pixel(int vp,unsigned int x, unsigned int y)
{
        putpixel(vp, x, y, ~getpixel(vp, x, y));
}


/***************************************************************/
/* Character-console functions */

/** Draw character at given position */
static void draw_glyph(int vp,__u8 glyph, unsigned int sx, unsigned int sy, style_t style)
{
        int i;
        unsigned int y;
        unsigned int glline;

        for (y = 0; y < FONT_SCANLINES; y++) {
                glline = fb_font[glyph * FONT_SCANLINES + y];
                for (i = 0; i < 8; i++) {
                        if (glline & (1 << (7 - i)))
                                putpixel(vp, sx + i, sy + y, style.fg_color);
                        else
                                putpixel(vp, sx + i, sy + y, style.bg_color);
                }
        }
}

/** Invert character at given position */
static void invert_char(int vp,unsigned int row, unsigned int col)
{
        unsigned int x;
        unsigned int y;

        for (x = 0; x < COL_WIDTH; x++)
                for (y = 0; y < FONT_SCANLINES; y++)
                        invert_pixel(vp, col * COL_WIDTH + x, row * FONT_SCANLINES + y);
}

static void draw_logo(int vp,unsigned int startx, unsigned int starty)
{
        unsigned int x;
        unsigned int y;
        unsigned int byte;
        unsigned int rowbytes;

        rowbytes = (helenos_width - 1) / 8 + 1;

        for (y = 0; y < helenos_height; y++)
                for (x = 0; x < helenos_width; x++) {
                        byte = helenos_bits[rowbytes * y + x / 8];
                        byte >>= x % 8;
                        if (byte & 1)
                                putpixel(vp ,startx + x, starty + y, viewports[vp].style.fg_color);
                }
}

/***************************************************************/
/* Stdout specific functions */


/** Create new viewport
 *
 * @return New viewport number
 */
static int viewport_create(unsigned int x, unsigned int y,unsigned int width, 
                           unsigned int height)
{
        int i;

for (i=0; i < MAX_VIEWPORTS; i++) {
                if (!viewports[i].initialized)
                        break;
        }
        if (i == MAX_VIEWPORTS)
                return ELIMIT;

        if (width ==0 || height == 0 ||
            x+width > screen.xres || y+height > screen.yres)
                return EINVAL;
        if (width < FONT_SCANLINES || height < COL_WIDTH)
                return EINVAL;

        viewports[i].x = x;
        viewports[i].y = y;
        viewports[i].width = width;
        viewports[i].height = height;
        
        viewports[i].rows = height / FONT_SCANLINES;
        viewports[i].cols = width / COL_WIDTH;

        viewports[i].style.bg_color = DEFAULT_BGCOLOR;
        viewports[i].style.fg_color = DEFAULT_FGCOLOR;
        
        viewports[i].cur_col = 0;
        viewports[i].cur_row = 0;
        viewports[i].cursor_active = 0;

        viewports[i].initialized = 1;

        return i;
}


/** Initialize framebuffer as a chardev output device
 *
 * @param addr Address of theframebuffer
 * @param x    Screen width in pixels
 * @param y    Screen height in pixels
 * @param bpp  Bits per pixel (8, 16, 24, 32)
 * @param scan Bytes per one scanline
 *
 */
static void screen_init(void *addr, unsigned int xres, unsigned int yres, unsigned int bpp, unsigned int scan)
{
        switch (bpp) {
                case 8:
                        screen.putpixel = putpixel_1byte;
                        screen.getpixel = getpixel_1byte;
                        screen.pixelbytes = 1;
                        break;
                case 16:
                        screen.putpixel = putpixel_2byte;
                        screen.getpixel = getpixel_2byte;
                        screen.pixelbytes = 2;
                        break;
                case 24:
                        screen.putpixel = putpixel_3byte;
                        screen.getpixel = getpixel_3byte;
                        screen.pixelbytes = 3;
                        break;
                case 32:
                        screen.putpixel = putpixel_4byte;
                        screen.getpixel = getpixel_4byte;
                        screen.pixelbytes = 4;
                        break;
        }

                
        screen.fbaddress = (unsigned char *) addr;
        screen.xres = xres;
        screen.yres = yres;
        screen.scanline = scan;
        
        /* Create first viewport */
        viewport_create(0,0,xres,yres);
}

static void cursor_hide(int vp)
{
        viewport_t *vport = &viewports[vp];

        if (vport->cursor_active && vport->cursor_shown) {
                invert_char(vp, vport->cur_row, vport->cur_col);
                vport->cursor_shown = 0;
        }
}

static void cursor_print(int vp)
{
        viewport_t *vport = &viewports[vp];

        /* Do not check for cursor_shown */
        if (vport->cursor_active) {
                invert_char(vp, vport->cur_row, vport->cur_col);
                vport->cursor_shown = 1;
        }
}

static void cursor_blink(int vp)
{
        viewport_t *vport = &viewports[vp];

        if (vport->cursor_shown)
                cursor_hide(vp);
        else
                cursor_print(vp);
}

/** Draw character at given position relative to viewport 
 * 
 * @param vp Viewport identification
 * @param c Character to print
 * @param row Screen position relative to viewport
 * @param col Screen position relative to viewport
 */
static void draw_char(int vp, char c, unsigned int row, unsigned int col, style_t style)
{
        viewport_t *vport = &viewports[vp];

        /* Optimize - 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))
                invert_char(vp, vport->cur_row, vport->cur_col);
        
        draw_glyph(vp, c, col * COL_WIDTH, row * FONT_SCANLINES, style);

        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_print(vp);
}

static void draw_text_data(int vp, keyfield_t *data)
{
        viewport_t *vport = &viewports[vp];
        int i;
        char c;
        int col,row;

        clear_port(vp);
        for (i=0; i < vport->cols * vport->rows; i++) {
                if (data[i].character == ' ' && style_same(data[i].style,vport->style))
                        continue;
                col = i % vport->cols;
                row = i / vport->cols;
                draw_glyph(vp, data[i].character, col * COL_WIDTH, row * FONT_SCANLINES, data[i].style);
        }
        cursor_print(vp);
}


/** Function for handling connections to FB
 *
 */
static void fb_client_connection(ipc_callid_t iid, ipc_call_t *icall)
{
        ipc_callid_t callid;
        ipc_call_t call;
        int retval;
        int i;
        unsigned int row,col;
        char c;
        keyfield_t *interbuffer = NULL;
        size_t intersize = 0;

        int vp = 0;
        viewport_t *vport = &viewports[0];

        if (client_connected) {
                ipc_answer_fast(iid, ELIMIT, 0,0);
                return;
        }
        client_connected = 1;
        ipc_answer_fast(iid, 0, 0, 0); /* Accept connection */

        while (1) {
                callid = async_get_call_timeout(&call,250000);
                if (!callid) {
                        cursor_blink(vp);
                        continue;
                }
                switch (IPC_GET_METHOD(call)) {
                case IPC_M_PHONE_HUNGUP:
                        client_connected = 0;
                        /* cleanup other viewports */
                        for (i=1; i < MAX_VIEWPORTS; i++)
                                vport->initialized = 0;
                        ipc_answer_fast(callid,0,0,0);
                        return; /* Exit thread */
                case IPC_M_AS_AREA_SEND:
                        /* We accept one area for data interchange */
                        intersize = IPC_GET_ARG2(call);
                        receive_comm_area(callid,&call,(void **)&interbuffer,
                                          sizeof(*interbuffer)*viewports[0].cols*viewports[0].rows);
                        continue;

                case FB_DRAW_TEXT_DATA:
                        if (!interbuffer) {
                                retval = EINVAL;
                                break;
                        }
                        if (intersize < vport->cols*vport->rows*sizeof(*interbuffer)) {
                                retval = EINVAL;
                                break;
                        }
                        draw_text_data(vp, interbuffer);
                        retval = 0;
                        break;
                case FB_PUTCHAR:
                        c = IPC_GET_ARG1(call);
                        row = IPC_GET_ARG2(call);
                        col = IPC_GET_ARG3(call);
                        if (row >= vport->rows || col >= vport->cols) {
                                retval = EINVAL;
                                break;
                        }
                        ipc_answer_fast(callid,0,0,0);

                        draw_char(vp, c, row, col, vport->style);
                        continue; /* msg already answered */
                case FB_CLEAR:
                        clear_port(vp);
                        cursor_print(vp);
                        retval = 0;
                        break;
                case FB_CURSOR_GOTO:
                        row = IPC_GET_ARG1(call);
                        col = IPC_GET_ARG2(call);
                        if (row >= vport->rows || col >= vport->cols) {
                                retval = EINVAL;
                                break;
                        }
                        retval = 0;
                        cursor_hide(vp);
                        vport->cur_col = col;
                        vport->cur_row = row;
                        cursor_print(vp);
                        break;
                case FB_CURSOR_VISIBILITY:
                        cursor_hide(vp);
                        vport->cursor_active = IPC_GET_ARG1(call);
                        cursor_print(vp);
                        retval = 0;
                        break;
                case FB_GET_CSIZE:
                        ipc_answer_fast(callid, 0, vport->rows, vport->cols);
                        continue;
                case FB_SCROLL:
                        i = IPC_GET_ARG1(call);
                        if (i > vport->rows || i < (- (int)vport->rows)) {
                                retval = EINVAL;
                                break;
                        }
                        cursor_hide(vp);
                        scroll_port(vp, i);
                        cursor_print(vp);
                        retval = 0;
                        break;
                case FB_VIEWPORT_SWITCH:
                        i = IPC_GET_ARG1(call);
                        if (i < 0 || i >= MAX_VIEWPORTS) {
                                retval = EINVAL;
                                break;
                        }
                        if (! viewports[i].initialized ) {
                                retval = EADDRNOTAVAIL;
                                break;
                        }
                        cursor_hide(vp);
                        vp = i;
                        vport = &viewports[vp];
                        cursor_print(vp);
                        retval = 0;
                        break;
                case FB_VIEWPORT_CREATE:
                        retval = viewport_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 < 0 || i >= MAX_VIEWPORTS) {
                                retval = EINVAL;
                                break;
                        }
                        if (! viewports[i].initialized ) {
                                retval = EADDRNOTAVAIL;
                                break;
                        }
                        viewports[i].initialized = 0;
                        retval = 0;
                        break;
                case FB_SET_STYLE:
                        vport->style.fg_color = IPC_GET_ARG1(call);
                        vport->style.bg_color = IPC_GET_ARG2(call);
                        retval = 0;
                        break;
                case FB_GET_RESOLUTION:
                        ipc_answer_fast(callid, 0, screen.xres,screen.yres);
                        continue;
                default:
                        retval = ENOENT;
                }
                ipc_answer_fast(callid,retval,0,0);
        }
}

/** Initialization of framebuffer */
int fb_init(void)
{
        void *fb_ph_addr;
        unsigned int fb_width;
        unsigned int fb_height;
        unsigned int fb_bpp;
        unsigned int fb_scanline;
        void *fb_addr;
        size_t asz;

        async_set_client_connection(fb_client_connection);

        fb_ph_addr=(void *)sysinfo_value("fb.address.physical");
        fb_width=sysinfo_value("fb.width");
        fb_height=sysinfo_value("fb.height");
        fb_bpp=sysinfo_value("fb.bpp");
        fb_scanline=sysinfo_value("fb.scanline");

        asz = fb_scanline*fb_height;
        fb_addr = as_get_mappable_page(asz);
        
        map_physmem(fb_ph_addr, fb_addr, ALIGN_UP(asz,PAGE_SIZE) >>PAGE_WIDTH,
                    AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE);
        
        screen_init(fb_addr, fb_width, fb_height, fb_bpp, fb_scanline);

        return 0;
}