native.c

嵌入式系统图形用户界面编程

        if ((nx + w - 1 < gc.psd->clipminx) || (nx >= gc.psd->clipmaxx))
            goto inv_args;
        if ((ny + h - 1 < gc.psd->clipminy) || (ny >= gc.psd->clipmaxy))
            goto inv_args;
        if (nx < gc.psd->clipminx) {
            x += gc.psd->clipminx - nx;
            w -= gc.psd->clipminx - nx;
            nx = gc.psd->clipminx;
        } 
        if (nx + w - 1 >= gc.psd->clipmaxx) {
            w = gc.psd->clipmaxx - nx;
        }
        if (ny < gc.psd->clipminy) {
            y += gc.psd->clipminy - ny;
            h -= gc.psd->clipminy - ny;
            ny = gc.psd->clipminy;
        }
        if (ny + h - 1 >= gc.psd->clipmaxy) {
            h = gc.psd->clipmaxy - ny;
        }    
    } else {
        if ((nx + w - 1 < 0) || (nx >= gc.psd->xres))
            goto inv_args;
        if ((ny + h - 1 < 0) || (ny >= gc.psd->yres))
            goto inv_args;
        if (nx < 0) {
            x -= nx;
            w += nx;
            nx = 0;
        } 
        if (nx + w - 1 >= gc.psd->xres) {
            w = gc.psd->xres- nx;
        }
        if (ny < 0) {
            y -= ny;
            h += ny;
            ny = 0;
        }
        if (ny + h - 1 >= gc.psd->yres) {
            h = gc.psd->yres- ny;
        }    
    }
    
    if ((w <= 0) || (h <= 0))
        goto inv_args;

    if ((x < 0) || (x + w - 1 >= gc.psd->xres))
        goto inv_args;
    if ((y < 0) || (y + h - 1 >= gc.psd->yres))
        goto inv_args;

    if (gc.psd->doclip) {
        if ((nx < gc.psd->clipminx) || (nx + w - 1 >= gc.psd->clipmaxx)) 
            goto inv_args;
        if ((ny < gc.psd->clipminy) || (ny + h - 1 >= gc.psd->clipmaxy)) 
            goto inv_args;
    } else {
        if ((nx < 0) || (nx + w - 1 >= gc.psd->xres)) 
            goto inv_args;
        if ((ny < 0) || (ny + h - 1 >= gc.psd->yres)) 
            goto inv_args;
    }

    gc.psd->CopyBox (gc.psd, x, y, w, h, nx, ny);

    if (gc.psd->UpdateRect) gc.psd->UpdateRect (gc.psd, nx, ny, nx + w, ny + h);

inv_args:
    UNBLOCK_DRAW_SEM;
    return 0;
}

/* 
 * Must set destination graphics context
 */
static int crossblit (GAL_GC src, int sx, int sy, int w, int h,
        GAL_GC dst, int dx, int dy)
{
#if defined(_LITE_VERSION) && !(_STAND_ALONE)
    GAL_GC gc = dst;
#endif

    int Bpp = bytesperpixel (src);

    if ((w <= 0) || (h <= 0)) return -1;

    if (src.psd == dst.psd) {
        return copybox (src, sx, sy, w, h, dx, dy);
    }
    
    //src clip to screen
    if (_COOR_TRANS && src.psd == cur_gfx->phygc.psd) {

        /* dst is clipped and is a memory gc */
        if ((dx + w - 1 < dst.psd->clipminx) || (dx >= dst.psd->clipmaxx))
            return 0;
        if ((dy + h - 1 < dst.psd->clipminy) || (dy >= dst.psd->clipmaxy))
            return 0;

        if (dx < dst.psd->clipminx) {
            sx += dst.psd->clipminx - dx;
            w -= dst.psd->clipminx - dx;
            dx = dst.psd->clipminx;
        } 
        if (dx + w - 1 >= dst.psd->clipmaxx) {
            w = dst.psd->clipmaxx - dx;
        }
        if (dy < dst.psd->clipminy) {
            sy += dst.psd->clipminy - dy;
            h -= dst.psd->clipminy - dy;
            dy = dst.psd->clipminy;
        }
        if (dy + h - 1 >= dst.psd->clipmaxy) {
            h = dst.psd->clipmaxy - dy;
        }    

        if ((w <= 0) || (h <= 0))
            return 0;

        if ((dx < dst.psd->clipminx) || (dx + w - 1 >= dst.psd->clipmaxx)) 
            return 0;
        if ((dy < dst.psd->clipminy) || (dy + h - 1 >= dst.psd->clipmaxy))
            return 0;

        return getbox_wrapper (src, sx, sy, w, h, 
                        dst.psd->addr + dst.psd->linelen * dy + Bpp * dx, 
                        dst.psd->xres * bytesperpixel (dst));
    }

    if (_COOR_TRANS && dst.psd == cur_gfx->phygc.psd) {

        /* src is a memory gc */
        if ((sx + w <= 0) || (sx >= src.psd->xres))
            return 0;
        if ((sy + h <= 0) || (sy >= src.psd->yres))
            return 0;

        if (sx < 0) {
            sx = 0;
            dx -= sx;
            w += sx;
        } 
        if (sx + w - 1 >= src.psd->xres) {
            w = src.psd->xres - sx;
        }
        if (sy < 0) {
            sy = 0;
            dy -= sy;
            h +=sy;
        }
        if (sy + h - 1 >= src.psd->yres) {
            h = src.psd->yres - sy;
        }    

        if ((w <= 0) || (h <= 0))
            return 0;

        return putbox_wrapper (dst, dx, dy, w, h, 
                            src.psd->addr + src.psd->linelen * sy + Bpp * sx, 
                            src.psd->xres * bytesperpixel (src));
    }
    
    if ((sx >= src.psd->xres) || (sx + w - 1 < 0)) return -1;
    if ((sy >= src.psd->yres) || (sy + h - 1 < 0)) return -1;
    if (sx < 0) { dx -= sx; w += sx; sx = 0; }
    if (sy < 0) { dy -= sy; h += sy; sy = 0; }
    
    if (sx + w - 1 >= src.psd->xres) w = src.psd->xres - sx;
    if (sy + h - 1 >= src.psd->yres) h = src.psd->yres - sy;        

    BLOCK_DRAW_SEM;

    //dst do clip
    if (dst.psd->doclip) {
        if ((dx + w - 1 < dst.psd->clipminx) || (dx >= dst.psd->clipmaxx))
            goto inv_args;
        if ((dy + h - 1 < dst.psd->clipminy) || (dy >= dst.psd->clipmaxy))
            goto inv_args;
        if (dx < dst.psd->clipminx) {
            sx += dst.psd->clipminx - dx;
            w -= dst.psd->clipminx - dx;
            dx = dst.psd->clipminx;
        } 
        if (dx + w - 1 >= dst.psd->clipmaxx) {
            w = dst.psd->clipmaxx - dx;
        }
        if (dy < dst.psd->clipminy) {
            sy += dst.psd->clipminy - dy;
            h -= dst.psd->clipminy - dy;
            dy = dst.psd->clipminy;
        }
        if (dy + h - 1 >= dst.psd->clipmaxy) {
            h = dst.psd->clipmaxy - dy;
        }    
    } else {
        if ((dx + w - 1 < 0) || (dx >= dst.psd->xres))
            goto inv_args;
        if ((dy + h - 1 < 0) || (dy >= dst.psd->yres))
            goto inv_args;
        if (dx < 0) {
            sx -= dx;
            w += dx;
            dx = 0;
        } 
        if (dx + w - 1 >= dst.psd->xres) {
            w = dst.psd->xres- dx;
        }
        if (dy < 0) {
            sy -= dy;
            h += dy;
            dy = 0;
        }
        if (dy + h - 1 >= dst.psd->yres) {
            h = dst.psd->yres- dy;
        }    
    }
    
    if ((w <= 0) || (h <= 0))
        goto inv_args;

    if ((sx < 0) || (sx + w - 1 >= src.psd->xres))
        goto inv_args;
    if ((sy < 0) || (sy + h - 1 >= src.psd->yres))
        goto inv_args;

    if (dst.psd->doclip) {
        if ((dx < dst.psd->clipminx) || (dx + w - 1 >= dst.psd->clipmaxx)) 
            goto inv_args;
        if ((dy < dst.psd->clipminy) || (dy + h - 1 >= dst.psd->clipmaxy))
            goto inv_args;
    } else {
        if ((dx < 0) || (dx + w - 1 >= dst.psd->xres)) 
            goto inv_args;
        if ((dy < 0) || (dy + h - 1 >= dst.psd->yres)) 
            goto inv_args;
    }

    src.psd->Blit (dst.psd, dx, dy, w, h, src.psd, sx, sy);

    if (dst.psd->UpdateRect) dst.psd->UpdateRect (dst.psd, dx, dy, dx + w, dy + h);

inv_args:
    UNBLOCK_DRAW_SEM;
    return 0;
}


static int drawhline (GAL_GC gc, int x, int y, int w, gal_pixel pixel)
{
    if (w <= 0 ) return -1;

    BLOCK_DRAW_SEM;

    if (_COOR_TRANS && gc.psd == cur_gfx->phygc.psd) {
        rotatepoint (&x, &y, _ROT_DIR_CCW?gc.psd->xres:gc.psd->yres, _ROT_DIR_CCW?0:1);
        if (!_ROT_DIR_CCW) y -= w - 1;

        if (native_gen_clipvline (gc.psd, &x, &y, &w) == CLIP_INVISIBLE )
            goto ret;

        gc.psd->DrawVLine (gc.psd, x, y, w, pixel);
        if (gc.psd->UpdateRect) gc.psd->UpdateRect (gc.psd, x, y, x + 1, y + w);
    }
    else {
        if (native_gen_cliphline (gc.psd, &x, &y, &w) == CLIP_INVISIBLE )
            goto ret;

        gc.psd->DrawHLine (gc.psd, x, y, w, pixel);
        if (gc.psd->UpdateRect) gc.psd->UpdateRect (gc.psd, x, y, x + w, y + 1);
    }

ret:
    UNBLOCK_DRAW_SEM;
    return 0;
}

static int drawvline (GAL_GC gc, int x, int y, int h, gal_pixel pixel)
{
    if (h <= 0 ) return -1;
    
    BLOCK_DRAW_SEM;

    if (_COOR_TRANS && gc.psd == cur_gfx->phygc.psd) {
        rotatepoint (&x, &y, _ROT_DIR_CCW?gc.psd->xres:gc.psd->yres, _ROT_DIR_CCW?0:1);
        if (_ROT_DIR_CCW) x -= h - 1;

        if (native_gen_clipvline (gc.psd, &x, &y, &h) == CLIP_INVISIBLE )
            goto ret;

        gc.psd->DrawVLine (gc.psd, x, y, h, pixel);
        if (gc.psd->UpdateRect) gc.psd->UpdateRect (gc.psd, x, y, x + 1, y + h);
    }
    else {
        if (native_gen_cliphline (gc.psd, &x, &y, &h) == CLIP_INVISIBLE )
            goto ret;

        gc.psd->DrawHLine (gc.psd, x, y, h, pixel);
        if (gc.psd->UpdateRect) gc.psd->UpdateRect (gc.psd, x, y, x + h, y + 1);
    }

ret:
    UNBLOCK_DRAW_SEM;
    return 0;
}

/*
 *  Pixel operations
 */
static int drawpixel (GAL_GC gc, int x, int y, gal_pixel pixel)
{
    BLOCK_DRAW_SEM;

    if (_COOR_TRANS && gc.psd == cur_gfx->phygc.psd)
        rotatepoint (&x, &y, _ROT_DIR_CCW?gc.psd->xres:gc.psd->yres, _ROT_DIR_CCW?0:1);

    if (native_gen_clippoint (gc.psd, x, y)) {
        gc.psd->DrawPixel (gc.psd, x, y, pixel);
        if (gc.psd->UpdateRect) gc.psd->UpdateRect (gc.psd, x, y, x + 1, y + 1);
    }

    UNBLOCK_DRAW_SEM;
    return 0;
}


static int getpixel (GAL_GC gc, int x, int y, gal_pixel* pixel)
{
    if (_COOR_TRANS && gc.psd == cur_gfx->phygc.psd) {
        if ((x >= 0) && (x < gc.psd->yres) && (y >= 0) && (y < gc.psd->xres)) {
            rotatepoint (&x, &y, _ROT_DIR_CCW?gc.psd->xres:gc.psd->yres, _ROT_DIR_CCW?0:1);
            *pixel = gc.psd->ReadPixel (gc.psd, x, y);
        } else 
            return -1;
    }
    else {
        if ((x >= 0) && (x < gc.psd->xres) && (y >= 0) && (y < gc.psd->yres))
            *pixel = gc.psd->ReadPixel (gc.psd, x, y);
        else 
            return -1;
    }

    return 0;
}

static int line (GAL_GC gc, int x1, int y1, int x2, int y2, gal_pixel pixel)
{
    gal_pixel oldcolor;

    BLOCK_DRAW_SEM;

    getfgcolor(gc,&oldcolor);
    setfgcolor(gc,pixel);

    if (_COOR_TRANS && gc.psd == cur_gfx->phygc.psd) {
        rotatepoint (&x1, &y1, _ROT_DIR_CCW?gc.psd->xres:gc.psd->yres, _ROT_DIR_CCW?0:1);
        rotatepoint (&x2, &y2, _ROT_DIR_CCW?gc.psd->xres:gc.psd->yres, _ROT_DIR_CCW?0:1);
    }

    native_gen_line (gc.psd, x1, y1, x2, y2, TRUE);
    if (gc.psd->UpdateRect) gc.psd->UpdateRect (gc.psd, x1, y1, x2, y2);

    setfgcolor(gc,oldcolor);

    UNBLOCK_DRAW_SEM;
    return 0;
}

/* 
 * NOTE: must be normalized rect.
 */
static int rectangle (GAL_GC gc, int l, int t, int r, int b, gal_pixel pixel)
{
    gal_pixel oldcolor;
    
    BLOCK_DRAW_SEM;

    getfgcolor(gc,&oldcolor);
    setfgcolor(gc,pixel);

    if (_COOR_TRANS && gc.psd == cur_gfx->phygc.psd)
        rotatecoor (&l, &t, &r, &b, _ROT_DIR_CCW?gc.psd->xres:gc.psd->yres, _ROT_DIR_CCW?0:1);

    native_gen_rect (gc.psd, l, t, r, b);
    if (gc.psd->UpdateRect) gc.psd->UpdateRect (gc.psd, l, t, r, b);

    setfgcolor (gc, oldcolor);

    UNBLOCK_DRAW_SEM;
    return 0;
}

static int circle (GAL_GC gc, int x, int y, int r, gal_pixel pixel)
{
    BLOCK_DRAW_SEM;

    if (_COOR_TRANS && gc.psd == cur_gfx->phygc.psd)
        rotatepoint (&x, &y, _ROT_DIR_CCW?gc.psd->xres:gc.psd->yres, _ROT_DIR_CCW?0:1);
    native_gen_circle (gc.psd, x, y, r, pixel);
    if (gc.psd->UpdateRect) gc.psd->UpdateRect (gc.psd, x - r, y - r, x + r, y + r);

    UNBLOCK_DRAW_SEM;
    return 0;
}

static void panic (int exitcode)
{
    fprintf (stderr, "MiniGUI Panic. Exit Code: %d.\n", exitcode);

    cur_gfx->phygc.psd->Close (cur_gfx->phygc.psd);

    _exit (exitcode);
}

/******************  Initialization and termination of Native IAL engine **************/
BOOL InitNative (GFX* gfx)
{
    int i;
    PSD psd = NULL;

    if (0) {}
#ifdef _NATIVE_GAL_FBCON
    else if (strcasecmp (gfx->id, "fbcon") == 0)
        psd = scrdev.Open (&scrdev);
#endif
#ifdef _NATIVE_GAL_QVFB
    else if (strcasecmp (gfx->id, "qvfb") == 0)
        psd = qvfbdev.Open (&qvfbdev);
#endif
#ifdef _NATIVE_GAL_ECOSLCD
    else if (strcasecmp (gfx->id, "ecoslcd") == 0)
        psd = ecoslcd.Open (&ecoslcd);
#endif

    if (!psd) return FALSE;

    gfx->phygc.psd = psd; 
    gfx->bytes_per_phypixel = (psd->bpp + 7 ) / 8;
    gfx->bits_per_phypixel  =  psd->bpp;

    if (_COOR_TRANS) {
        gfx->width_phygc        = psd->yres; 
        gfx->height_phygc       = psd->xres;
    }
    else {
        gfx->width_phygc        = psd->xres; 
        gfx->height_phygc       = psd->yres;
    }

    gfx->colors_phygc       = psd->ncolors;
    gfx->grayscale_screen = FALSE;
    
    gfx->bytesperpixel      = bytesperpixel;
    gfx->bitsperpixel       = bitsperpixel;
    gfx->width              = width;
    gfx->height             = height;
    gfx->colors             = colors;

    //now functions
    gfx->allocategc         = allocategc;
    gfx->freegc             = freegc;
    gfx->enableclipping     = enableclipping;
    gfx->disableclipping    = disableclipping;
    gfx->setclipping        = setclipping;
    gfx->getclipping        = getclipping;
    gfx->getbgcolor         = getbgcolor;
    gfx->setbgcolor         = setbgcolor;
    gfx->getfgcolor         = getfgcolor;
    gfx->setfgcolor         = setfgcolor;
    gfx->mapcolor           = mapcolor;
    gfx->unmappixel         = unmappixel;
    gfx->getpalette         = getpalette;
    gfx->setpalette         = setpalette;
    gfx->setcolorfulpalette = setcolorfulpalette;

    gfx->boxsize            = boxsize;
    gfx->fillbox            = fillbox;
    gfx->putbox             = putbox;
    gfx->putboxmask         = putboxmask;
    gfx->getbox             = getbox;
    gfx->scalebox           = scalebox;
    gfx->copybox            = copybox;
    gfx->crossblit          = crossblit;
    gfx->drawhline          = drawhline;
    gfx->drawvline          = drawvline;

    gfx->drawpixel          = drawpixel;
    gfx->getpixel           = getpixel;

    gfx->line               = line;
    gfx->rectangle          = rectangle;

    gfx->panic              = panic;
    gfx->circle             = circle;

    gfx->setgc              = NULL;
    
    setcolorfulpalette(gfx->phygc);
    
    for (i = 0; i < 17; i++)
        SysPixelIndex [i] = mapcolor (gfx->phygc, (GAL_Color*)(SysPixelColor + i));

    if (_COOR_TRANS)
        setclipping (gfx->phygc, 0, 0, psd->yres - 1, psd->xres - 1);
    else
        setclipping (gfx->phygc, 0, 0, psd->xres - 1, psd->yres - 1);

    return TRUE;
}

void TermNative (GFX* gfx)
{
    gfx->phygc.psd->Close(gfx->phygc.psd);
}