qvfb.c

嵌入式系统图形用户界面编程

/*
    MiniGUI - A compact GUI support system for real-time embedded Linux.
    Copyright (C) 2001 Wei Yongming

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Wei Yongming
    [e-mail]
*/

/* Qt virtual FrameBuffer based video driver implementation.
*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>

#include "common.h"
#include "minigui.h"
#include "misc.h"
#include "newgal.h"
#include "sysvideo.h"
#include "qvfb.h"

/* Initialization/Query functions */
static int QVFB_VideoInit(_THIS, GAL_PixelFormat *vformat);
static GAL_Rect **QVFB_ListModes(_THIS, GAL_PixelFormat *format, Uint32 flags);
static GAL_Surface *QVFB_SetVideoMode(_THIS, GAL_Surface *current, int width, int height, int bpp, Uint32 flags);
static int QVFB_SetColors(_THIS, int firstcolor, int ncolors, GAL_Color *colors);
static void QVFB_VideoQuit(_THIS);

/* Hardware surface functions */
static int QVFB_AllocHWSurface(_THIS, GAL_Surface *surface);
static void QVFB_FreeHWSurface(_THIS, GAL_Surface *surface);

/* QVFB driver bootstrap functions */
static int QVFB_Available (void)
{
    char file [50];
    int display;
    key_t key;
    int shmid;

    if (GetMgEtcIntValue ("qvfb", "display", &display) < 0)
        return 0;

    sprintf (file, QT_VFB_MOUSE_PIPE, display);
    key = ftok (file, 'b');

    shmid = shmget (key, 0, 0);
    return shmid != -1;
}

static void QVFB_DeleteDevice (GAL_VideoDevice *device)
{
    free (device->hidden);
    free (device);
}

static void QVFB_UpdateRects (_THIS, int numrects, GAL_Rect *rects)
{
    int i;
    RECT bound = this->hidden->hdr->update;

    if (bound.right == -1) bound.right = 0;
    if (bound.bottom == -1) bound.bottom = 0;

    for (i = 0; i < numrects; i++) {
        RECT rc;

        SetRect (&rc, rects[i].x, rects[i].y, 
                        rects[i].x + rects[i].w, rects[i].y + rects[i].h);
        GetBoundRect (&bound, &bound, &rc);
    }

    this->hidden->hdr->update = bound;
    this->hidden->hdr->dirty = TRUE;
}

static GAL_VideoDevice *QVFB_CreateDevice (int devindex)
{
    GAL_VideoDevice *this;

    /* Initialize all variables that we clean on shutdown */
    this = (GAL_VideoDevice *)malloc(sizeof(GAL_VideoDevice));
    if (this) {
        memset (this, 0, (sizeof *this));
        this->hidden = (struct GAL_PrivateVideoData *) malloc ((sizeof *this->hidden));
    }

    if ((this == NULL) || (this->hidden == NULL)) {
        GAL_OutOfMemory ();
        if (this) free (this);
        return (0);
    }
    memset (this->hidden, 0, (sizeof *this->hidden));

    /* Set the function pointers */
    this->VideoInit = QVFB_VideoInit;
    this->ListModes = QVFB_ListModes;
    this->SetVideoMode = QVFB_SetVideoMode;
    this->SetColors = QVFB_SetColors;
    this->VideoQuit = QVFB_VideoQuit;

    this->AllocHWSurface = QVFB_AllocHWSurface;
    this->FreeHWSurface = QVFB_FreeHWSurface;

    this->UpdateRects = QVFB_UpdateRects;

    this->CheckHWBlit = NULL;
    this->FillHWRect = NULL;
    this->SetHWColorKey = NULL;
    this->SetHWAlpha = NULL;

    this->free = QVFB_DeleteDevice;

    return this;
}

VideoBootStrap QVFB_bootstrap = {
    "qvfb", "Qt Virtual FrameBuffer",
    QVFB_Available, QVFB_CreateDevice
};

static int QVFB_VideoInit (_THIS, GAL_PixelFormat *vformat)
{
    char file [50];
    int display;
    key_t key;
    int shmid;
    struct GAL_PrivateVideoData* data = this->hidden;

    if (GetMgEtcIntValue ("qvfb", "display", &display) < 0)
        return -1;

    sprintf (file, QT_VFB_MOUSE_PIPE, display);
    key = ftok (file, 'b');
    shmid = shmget (key, 0, 0);
    if (shmid != -1)
        data->shmrgn = (unsigned char *)shmat (shmid, 0, 0);

    if ((int)data->shmrgn == -1 || data->shmrgn == NULL) {
        GAL_SetError ("Unable to attach to virtual FrameBuffer server.\n");
        return -1;
    }

    data->hdr = (struct QVFbHeader *) data->shmrgn;

    vformat->BitsPerPixel = data->hdr->depth;
    switch (vformat->BitsPerPixel) {
        case 8:
            vformat->BytesPerPixel = 1;
            data->hdr->numcols = 256;
            break;
        case 12:
            vformat->BitsPerPixel = 16;
            vformat->BytesPerPixel = 2;
            vformat->Rmask = 0x00000F00;
            vformat->Gmask = 0x000000F0;
            vformat->Bmask = 0x0000000F;
            break;
        case 16:
            vformat->BytesPerPixel = 2;
            vformat->Rmask = 0x0000F800;
            vformat->Gmask = 0x000007E0;
            vformat->Bmask = 0x0000001F;
            break;
        case 32:
            vformat->BytesPerPixel = 4;
            vformat->Rmask = 0x00FF0000;
            vformat->Gmask = 0x0000FF00;
            vformat->Bmask = 0x000000FF;
            break;
        default:
            GAL_SetError ("Not supported depth: %d.\n", vformat->BitsPerPixel);
            return -1;
    }

    return 0;
}

static GAL_Rect **QVFB_ListModes (_THIS, GAL_PixelFormat *format, Uint32 flags)
{
    return (GAL_Rect **) -1;
}

static GAL_Surface *QVFB_SetVideoMode (_THIS, GAL_Surface *current,
                                int width, int height, int bpp, Uint32 flags)
{
    /* Set up the mode framebuffer */
    current->flags = GAL_HWSURFACE | GAL_FULLSCREEN;
    current->w = this->hidden->hdr->width;
    current->h = this->hidden->hdr->height;
    current->pitch = this->hidden->hdr->linestep;
    current->pixels = this->hidden->shmrgn + this->hidden->hdr->dataoffset;

    /* We're done */
    return current;
}

/* We don't actually allow hardware surfaces other than the main one */
static int QVFB_AllocHWSurface(_THIS, GAL_Surface *surface)
{
    return -1;
}

static void QVFB_FreeHWSurface(_THIS, GAL_Surface *surface)
{
    surface->pixels = NULL;
}

static int QVFB_SetColors(_THIS, int firstcolor, int ncolors, GAL_Color *colors)
{
    int i, pixel = firstcolor;

    for (i = 0; i < ncolors; i++) {
        this->hidden->hdr->clut [pixel] 
                = (0xff << 24) | ((colors[i].r & 0xff) << 16) | ((colors[i].g & 0xff) << 8) | (colors[i].b & 0xff);
        pixel ++;
    }

    return 0;
}

static void QVFB_VideoQuit (_THIS)
{
    shmdt (this->hidden->shmrgn);
}