gpcanvas.c

Graphviz - Graph Drawing Programs from AT&T Research and Lucent Bell Labs See doc/build.html for

    bufi = bufn = 0;
    bufp[bufi] = 0;
    for (y = 0; y < s.y; y++) {
        for (x = 0; x < s.x; x++) {
            for (k = 0; k < 3; k++) {
                if (bufi == bufn) {
                    if ((bufn = fread (bufp, 1, 2047, fp)) == 0) {
                        if (ferror (fp))
                            bufn = -1;
                        DeleteDC (gc);
                        DeleteObject (bitmap->u.bmap.orig);
                        Gerr (POS, G_ERRCANNOTCREATEBITMAP);
                        return -1;
                    }
                    bufi = 0;
                }
                rgb[k] = (unsigned char) bufp[bufi++];
            }
            SetPixel (gc, x, y, RGB (rgb[0], rgb[1], rgb[2]));
        }
    }
    DeleteDC (gc);
    return 0;
}

int GPwritebitmap (Gbitmap_t *bitmap, FILE *fp) {
    Gwidget_t *widget;
    HDC gc;
    COLORREF color;
    char bufp[2048];
    int bufi, x, y, w, h;

    if (!bitmap) {
        Gerr (POS, G_ERRNOBITMAP);
        return -1;
    }
    if (
        bitmap->canvas < 0 || bitmap->canvas >= Gwidgetn ||
        !Gwidgets[bitmap->canvas].inuse
    ) {
        Gerr (POS, G_ERRBADWIDGETID, bitmap->canvas);
        return -1;
    }
    widget = &Gwidgets[bitmap->canvas];
    if (widget->type != G_CANVASWIDGET && widget->type != G_PCANVASWIDGET) {
        Gerr (POS, G_ERRNOTACANVAS, bitmap->canvas);
        return -1;
    }
    gc = CreateCompatibleDC (GC);
    SelectObject (gc, bitmap->u.bmap.orig);
    fprintf (fp, "P6\n%d %d 255\n", (int) bitmap->size.x, (int) bitmap->size.y);
    bufi = 0;
    w = bitmap->size.x;
    h = bitmap->size.y;
    for (y = 0; y < h; y++) {
        for (x = 0; x < w; x++) {
            color = GetPixel (gc, x, y);
            bufp[bufi++] = GetRValue (color);
            bufp[bufi++] = GetGValue (color);
            bufp[bufi++] = GetBValue (color);
            if (bufi + 3 >= 2048) {
                fwrite (bufp, 1, bufi, fp);
                bufi = 0;
            }
        }
    }
    if (bufi > 0)
        fwrite (bufp, 1, bufi, fp);
    DeleteDC (gc);
    return 0;
}

int GPbitblt (
    Gwidget_t *widget, Gpoint_t gp, Grect_t gr, Gbitmap_t *bitmap,
    char *mode, Ggattr_t *ap
) {
    PIXrect_t pr, r;
    PIXpoint_t pp;
    PIXsize_t s;
    Gsize_t scale;
    Gxy_t p;
    HBITMAP pix;
    HDC gc;
    double tvx, tvy, twx, twy;

    if (gr.o.x > gr.c.x)
        p.x = gr.o.x, gr.o.x = gr.c.x, gr.c.x = p.x;
    if (gr.o.y > gr.c.y)
        p.y = gr.o.y, gr.o.y = gr.c.y, gr.c.y = p.y;
    if (strcmp (mode, "b2c") == 0) {
        tvx = WPU->vsize.x, tvy = WPU->vsize.y;
        twx = WPU->wrect.c.x - WPU->wrect.o.x;
        twy = WPU->wrect.c.y - WPU->wrect.o.y;
        scale.x = tvx / twx, scale.y = tvy / twy;
        if (scale.x == 1 && scale.y == 1) {
            pix = bitmap->u.bmap.orig;
            bitmap->scale = scale;
        } else {
            if (scale.x != bitmap->scale.x || scale.y != bitmap->scale.y)
                scalebitmap (widget, bitmap, scale, TRUE, 1);
            pix = bitmap->u.bmap.scaled;
        }
        pr = rdrawtopix (widget, gr);
        pp = pdrawtobpix (bitmap, gp);
        s.x = pr.c.x - pr.o.x + 1, s.y = pr.c.y - pr.o.y + 1;
        r.o.x = pp.x, r.o.y = pp.y - s.y + 1;
        r.c.x = r.o.x + s.x - 1, r.c.y = r.o.y + s.y - 1;
        if (r.o.x < 0)
            pr.o.x -= r.o.x, r.o.x = 0;
        if (r.o.y < 0)
            pr.o.y -= r.o.y, r.o.y = 0;
        if (r.c.x >= bitmap->size.x * scale.x) {
            pr.c.x -= (r.c.x + 1 - bitmap->size.x * scale.x);
            r.c.x = bitmap->size.x * scale.x - 1;
        }
        if (r.c.y >= bitmap->size.y * scale.y) {
            pr.c.y -= (r.c.y + 1 - bitmap->size.y * scale.y);
            r.c.y = bitmap->size.y * scale.y - 1;
        }
        if (pr.o.x < 0)
            r.o.x -= pr.o.x, pr.o.x = 0;
        if (pr.o.y < 0)
            r.o.y -= pr.o.y, pr.o.y = 0;
        setgattr (widget, ap);
        gc = CreateCompatibleDC (GC);
        SelectObject (gc, pix);
        BitBlt (
            GC, pr.o.x, pr.o.y, r.c.x - r.o.x + 1, r.c.y - r.o.y + 1,
            gc, r.o.x, r.o.y, (WPU->gattr.mode == G_SRC) ? SRCCOPY : SRCINVERT
        );
        DeleteDC (gc);
    } else if (strcmp (mode, "c2b") == 0) {
        tvx = WPU->vsize.x, tvy = WPU->vsize.y;
        twx = WPU->wrect.c.x - WPU->wrect.o.x;
        twy = WPU->wrect.c.y - WPU->wrect.o.y;
        scale.x = tvx / twx, scale.y = tvy / twy;
        if (scale.x == 1 && scale.y == 1) {
            pix = bitmap->u.bmap.orig;
            bitmap->scale = scale;
        } else {
            if (scale.x != bitmap->scale.x || scale.y != bitmap->scale.y)
                scalebitmap (widget, bitmap, scale, FALSE, 1);
            pix = bitmap->u.bmap.scaled;
        }
        pr = rdrawtobpix (bitmap, gr);
        pp = pdrawtopix (widget, gp);
        s.x = pr.c.x - pr.o.x + 1, s.y = pr.c.y - pr.o.y + 1;
        r.o.x = pp.x, r.o.y = pp.y - s.y + 1;
        r.c.x = r.o.x + s.x - 1, r.c.y = r.o.y + s.y - 1;
        if (pr.o.x < 0)
            r.o.x -= pr.o.x, pr.o.x = 0;
        if (pr.o.y < 0)
            r.o.y -= pr.o.y, pr.o.y = 0;
        if (pr.c.x >= bitmap->size.x * scale.x) {
            r.c.x -= (pr.c.x + 1 - bitmap->size.x * scale.x);
            pr.c.x = bitmap->size.x * scale.x - 1;
        }
        if (pr.c.y >= bitmap->size.y * scale.y) {
            r.c.y -= (pr.c.y + 1 - bitmap->size.y * scale.y);
            pr.c.y = bitmap->size.y * scale.y - 1;
        }
        if (r.o.x < 0)
            pr.o.x -= r.o.x, r.o.x = 0;
        if (r.o.y < 0)
            pr.o.y -= r.o.y, r.o.y = 0;
        setgattr (widget, ap);
        gc = CreateCompatibleDC (GC);
        SelectObject (gc, pix);
        BitBlt (
            gc, pr.o.x, pr.o.y, r.c.x - r.o.x + 1, r.c.y - r.o.y + 1,
            GC, r.o.x, r.o.y, (WPU->gattr.mode == G_SRC) ? SRCCOPY : SRCINVERT
        );
        if (pix != bitmap->u.bmap.orig)
            scalebitmap (widget, bitmap, scale, TRUE, -1);
        DeleteDC (gc);
    }
    return 0;
}

static int scalebitmap (
    Gwidget_t *widget, Gbitmap_t *bitmap, Gsize_t scale,
    int copybits, int dir
) {
    Gsize_t nsize, o2n;
    HBITMAP opix, spix;
    COLORREF color;
    HDC gc1, gc2;
    int x, y, x2, y2, xp, yp;
    double prod, rgb[3], xr2, yr2, xl2, yl2, xf2, yf2, xr, yr, xl, yl;

    if (!copybits) {
        if (dir == 1) {
            nsize.x = (int) (bitmap->size.x * scale.x);
            nsize.y = (int) (bitmap->size.y * scale.y);
            if (!(spix = CreateBitmap (
                (int) nsize.x, (int) nsize.y, 1, Gdepth, NULL
            ))) {
                Gerr (POS, G_ERRCANNOTCREATEBITMAP);
                return -1;
            }
            if (bitmap->u.bmap.scaled)
                DeleteObject (bitmap->u.bmap.scaled);
            bitmap->u.bmap.scaled = spix;
            bitmap->scale = scale;
        }
        return 0;
    }
    if (dir == 1) {
        nsize.x = (int) (bitmap->size.x * scale.x);
        nsize.y = (int) (bitmap->size.y * scale.y);
        o2n.x = 1 / scale.x, o2n.y = 1 / scale.y;
        if (!(spix = CreateBitmap (
            (int) nsize.x, (int) nsize.y, 1, Gdepth, NULL
        ))) {
            Gerr (POS, G_ERRCANNOTCREATEBITMAP);
            return -1;
        }
        opix = bitmap->u.bmap.orig;
    } else {
        nsize.x = (int) bitmap->size.x;
        nsize.y = (int) bitmap->size.y;
        o2n.x = scale.x, o2n.y = scale.y;
        spix = bitmap->u.bmap.orig;
        opix = bitmap->u.bmap.scaled;
    }
    gc1 = CreateCompatibleDC (GC);
    SelectObject (gc1, opix);
    gc2 = CreateCompatibleDC (GC);
    SelectObject (gc2, spix);
    prod = o2n.x * o2n.y;
    y = 0;
    yr = o2n.y;
    yl = 0;
    for (yp = 0; yp < nsize.y; yp++) {
        x = 0;
        xr = o2n.x;
        xl = 0;
        for (xp = 0; xp < nsize.x; xp++) {
            y2 = y;
            yr2 = yr;
            yl2 = yl;
            rgb[0] = rgb[1] = rgb[2] = 0;
            do {
                x2 = x;
                xr2 = xr;
                xl2 = xl;
                yf2 = (yl2 + yr2 > 1) ? 1 - yl2 : yr2, yr2 -= yf2;
                do {
                    xf2 = (xl2 + xr2 > 1) ? 1 - xl2 : xr2, xr2 -= xf2;
                    color = GetPixel (gc1, x2, y2);
                    rgb[0] += (GetRValue (color) * xf2 * yf2 / prod);
                    rgb[1] += (GetGValue (color) * xf2 * yf2 / prod);
                    rgb[2] += (GetBValue (color) * xf2 * yf2 / prod);
                    xl2 += xf2;
                    if (xl2 >= 1)
                        x2++, xl2 -= 1;
                } while (xr2 > 0);
                xr2 = o2n.x;
                yl2 += yf2;
                if (yl2 >= 1)
                    y2++, yl2 -= 1;
            } while (yr2 > 0);
            yr2 = o2n.y;
            SetPixel (gc2, xp, yp, RGB (rgb[0], rgb[1], rgb[2]));
            x = x2;
            xr = xr2;
            xl = xl2;
        }
        y = y2;
        yr = yr2;
        yl = yl2;
    }
    DeleteDC (gc1);
    DeleteDC (gc2);
    if (dir == 1) {
        if (bitmap->u.bmap.scaled)
            DeleteObject (bitmap->u.bmap.scaled);
        bitmap->u.bmap.scaled = spix;
        bitmap->scale = scale;
    }
    return 0;
}

static void setgattr (Gwidget_t *widget, Ggattr_t *ap) {
    HBRUSH brush, pbrush;
    HPEN pen, ppen;
    PALETTEENTRY *colorp;
    long color, mode, style, width, flag, pati;
    double intens;

    if (!(ap->flags & G_GATTRCOLOR))
        ap->color = WPU->defgattr.color;
    if (!(ap->flags & G_GATTRWIDTH))
        ap->width = WPU->defgattr.width;
    if (!(ap->flags & G_GATTRMODE))
        ap->mode = WPU->defgattr.mode;
    if (!(ap->flags & G_GATTRFILL))
        ap->fill = WPU->defgattr.fill;
    if (!(ap->flags & G_GATTRSTYLE))
        ap->style = WPU->defgattr.style;
    flag = FALSE;
    mode = ap->mode;
    if (mode != WPU->gattr.mode) {
        WPU->gattr.mode = mode;
        SetROP2 (GC, (int) mode);
    }
    WPU->gattr.fill = ap->fill;
    color = ap->color;
    if (color >= G_MAXCOLORS || !(WPU->colors[color].inuse))
        color = 1;
    if (color != WPU->gattr.color)
        WPU->gattr.color = color, flag = TRUE;
    width = ap->width;
    if (width != WPU->gattr.width)
        WPU->gattr.width = width, flag = TRUE;
    style = ap->style;
    if (style != WPU->gattr.style)
        WPU->gattr.style = style, style = TRUE;

    if (!flag)
        return;
    WPU->gattr.color = color;
    if (Gdepth == 1) {
        colorp = &WPU->colors[color].color;
        intens = (
            0.3 * colorp->peBlue + 0.59 * colorp->peRed +
            0.11 * colorp->peGreen
        ) / 255.0;
        pati = (intens <= 0.0625) ? 16 : -16.0 * (log (intens) / 2.7725887222);
        brush = WPU->grays[pati];
    } else
        brush = CreateSolidBrush (PALETTEINDEX (WPU->gattr.color));
    pbrush = SelectObject (GC, brush);
    if (Gdepth != 1)
        DeleteObject (pbrush);
    pen = CreatePen (
        (int) gstyles[WPU->gattr.style], WPU->gattr.width,
        PALETTEINDEX (WPU->gattr.color)
    );
    ppen = SelectObject (GC, pen);
    DeleteObject (ppen);
    SetTextColor (GC, PALETTEINDEX (WPU->gattr.color));
}

static PIXrect_t rdrawtopix (Gwidget_t *widget, Grect_t gr) {
    PIXrect_t pr;
    double tvx, tvy, twx, twy;

    tvx = WPU->vsize.x - 1, tvy = WPU->vsize.y - 1;
    twx = WPU->wrect.c.x - WPU->wrect.o.x;
    twy = WPU->wrect.c.y - WPU->wrect.o.y;
    pr.o.x = tvx * (gr.o.x - WPU->wrect.o.x) / twx + 0.5;
    pr.o.y = tvy * (1.0  - (gr.c.y - WPU->wrect.o.y) / twy) + 0.5;
    pr.c.x = tvx * (gr.c.x - WPU->wrect.o.x) / twx + 0.5;
    pr.c.y = tvy * (1.0  - (gr.o.y - WPU->wrect.o.y) / twy) + 0.5;
    return pr;
}

static PIXpoint_t pdrawtopix (Gwidget_t *widget, Gpoint_t gp) {
    PIXpoint_t pp;
    double tvx, tvy, twx, twy;

    tvx = WPU->vsize.x - 1, tvy = WPU->vsize.y - 1;
    twx = WPU->wrect.c.x - WPU->wrect.o.x;
    twy = WPU->wrect.c.y - WPU->wrect.o.y;
    pp.x = tvx * (gp.x - WPU->wrect.o.x) / twx + 0.5;
    pp.y = tvy * (1.0  - (gp.y - WPU->wrect.o.y) / twy) + 0.5;
    return pp;
}

static PIXsize_t sdrawtopix (Gwidget_t *widget, Gsize_t gs) {
    PIXsize_t ps;
    double tvx, tvy, twx, twy;

    tvx = WPU->vsize.x - 1, tvy = WPU->vsize.y - 1;
    twx = WPU->wrect.c.x - WPU->wrect.o.x;
    twy = WPU->wrect.c.y - WPU->wrect.o.y;
    ps.x = tvx * (gs.x - 1) / twx + 1.5;
    ps.y = tvy * (gs.y - 1) / twy + 1.5;
    return ps;
}

static PIXrect_t rdrawtobpix (Gbitmap_t *bitmap, Grect_t gr) {
    PIXrect_t pr;
    double tvy;

    tvy = (int) ((bitmap->size.y - 1) * bitmap->scale.y);
    pr.o.x = gr.o.x + 0.5;
    pr.o.y = tvy - gr.c.y + 0.5;
    pr.c.x = gr.c.x + 0.5;
    pr.c.y = tvy - gr.o.y + 0.5;
    return pr;
}

static PIXpoint_t pdrawtobpix (Gbitmap_t *bitmap, Gpoint_t gp) {
    PIXpoint_t pp;
    double tvy;

    tvy = (int) ((bitmap->size.y - 1) * bitmap->scale.y);
    pp.x = gp.x + 0.5;
    pp.y = tvy - gp.y + 0.5;
    return pp;
}