Initial revision

1 files changed, 962 insertions, 0 deletions

diff --git a/viewer.c b/viewer.c
new file mode 100644
index 0000000..0bc81f5
--- /dev/null
+++ b/viewer.c
@@ -0,0 +1,962 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <math.h>
+#include <signal.h>
+
+#include <X11/X.h>
+#include <X11/Xlib.h>
+#include <X11/Intrinsic.h>
+#include <X11/StringDefs.h>
+#include <X11/cursorfont.h>
+#include <X11/extensions/XShm.h>
+
+#include "ida.h"
+#include "x11.h"
+#include "dither.h"
+#include "readers.h"
+#include "viewer.h"
+#include "hex.h"
+#include "idaconfig.h"
+
+/* ----------------------------------------------------------------------- */
+
+#define POINTER_NORMAL    0
+#define POINTER_BUSY      1
+#define POINTER_PICK      2
+#define RUBBER_NEW        3
+#define RUBBER_MOVE       4
+#define RUBBER_X1         5
+#define RUBBER_Y1         6
+#define RUBBER_X2         7
+#define RUBBER_Y2         8
+
+#define RUBBER_RANGE      6
+#define RUBBER_INTERVAL 100
+
+#define PROCESS_LINES    16
+
+int debug;
+Cursor ptrs[POINTER_COUNT];
+
+/* ----------------------------------------------------------------------- */
+
+Pixmap image_to_pixmap(struct ida_image *img)
+{
+    unsigned char line[256],*src;
+    XImage *ximage;
+    void *shm;
+    Pixmap pix;
+    GC gc;
+    unsigned int x,y;
+
+    ximage = x11_create_ximage(app_shell, img->i.width, img->i.height, &shm);
+    for (y = 0; y < img->i.height; y++) {
+	src = img->data + 3*y*img->i.width;
+	if (display_type == PSEUDOCOLOR) {
+	    dither_line(src, line, y, img->i.width);
+	    for (x = 0; x < img->i.width; x++)
+		XPutPixel(ximage, x, y, x11_map[line[x]]);
+	} else {
+	    for (x = 0; x < img->i.width; x++, src += 3) {
+		pix = x11_lut_red[src[0]] |
+		    x11_lut_green[src[1]] |
+		    x11_lut_blue[src[2]];
+		XPutPixel(ximage, x, y, pix);
+	    }
+	}
+    }
+    pix = XCreatePixmap(dpy,XtWindow(app_shell),img->i.width, img->i.height,
+			DefaultDepthOfScreen(XtScreen(app_shell)));
+    gc = XCreateGC(dpy, pix, 0, NULL);
+    XPUTIMAGE(dpy, pix, gc, ximage, 0, 0, 0, 0, img->i.width, img->i.height);
+    XFreeGC(dpy, gc);
+    x11_destroy_ximage(app_shell, ximage, shm);
+    return pix;
+}
+
+/* ----------------------------------------------------------------------- */
+
+int viewer_i2s(int zoom, int val)
+{
+    if (0 > zoom)
+	return val/(-zoom+1);
+    if (0 < zoom)
+	return val*(zoom+1);
+    return val;
+}
+
+/* ----------------------------------------------------------------------- */
+
+static void
+viewer_renderline(struct ida_viewer *ida, char *scanline)
+{
+    unsigned char *src,*dst,*rgb;
+    unsigned long pix;
+    unsigned int x,s,scrline;
+
+    src = scanline;
+
+    if (0 == ida->zoom) {
+	/* as-is */
+	if (display_type == PSEUDOCOLOR) {
+	    dst = ida->dither_line;
+	    dither_line(src, dst, ida->line, ida->scrwidth);
+	    for (x = 0; x < ida->scrwidth; x++, dst++)
+		XPutPixel(ida->ximage, x, ida->line, x11_map[*dst]);
+	} else {
+	    for (x = 0; x < ida->scrwidth; x++, src += 3) {
+		pix = x11_lut_red[src[0]] |
+		    x11_lut_green[src[1]] |
+		    x11_lut_blue[src[2]];
+		XPutPixel(ida->ximage, x, ida->line, pix);
+	    }
+	}
+
+    } else if (ida->zoom < 0) {
+	/* zoom out */
+	s = -ida->zoom+1;
+	if (s-1 != (ida->line % s))
+	    return;
+	scrline = ida->line/s;
+	if (display_type == PSEUDOCOLOR) {
+	    rgb = ida->rgb_line;
+	    for (x = 0; x < ida->scrwidth; x++, rgb += 3, src += 3*s) {
+		rgb[0] = src[0];
+		rgb[1] = src[1];
+		rgb[2] = src[2];
+	    }
+	    rgb = ida->rgb_line;
+	    dst = ida->dither_line;
+	    dither_line(rgb, dst, scrline, ida->scrwidth);
+	    for (x = 0; x < ida->scrwidth; x++, dst++)
+		XPutPixel(ida->ximage, x, scrline, x11_map[*dst]);
+	} else {
+#if 0
+	    /* just drop pixels */
+	    for (x = 0; x < ida->scrwidth; x++, src += 3*s) {
+		pix = x11_lut_red[src[0]] |
+		    x11_lut_green[src[1]] |
+		    x11_lut_blue[src[2]];
+		XPutPixel(ida->ximage, x, scrline, pix);
+	    }
+#else
+	    /* horizontal interpolation (vertical is much harder ...) */
+	    for (x = 0; x < ida->scrwidth; x++, src += 3*s) {
+		int red,green,blue,count,ix;
+		red   = 0;
+		green = 0;
+		blue  = 0;
+		count = 0;
+		for (ix = 0; ix < 3*s; ix += 3) {
+		    red   += src[ix+0];
+		    green += src[ix+1]; 
+		    blue  += src[ix+2]; 
+		    count += 1;
+		}
+		pix = x11_lut_red[red/count] |
+		    x11_lut_green[green/count] |
+		    x11_lut_blue[blue/count];
+		XPutPixel(ida->ximage, x, scrline, pix);
+	    }
+#endif
+	}
+	
+    } else {
+	/* zoom in */
+	s = ida->zoom+1;
+	if (display_type == PSEUDOCOLOR) {
+	    rgb = ida->rgb_line;
+	    for (x = 0; x < ida->scrwidth; rgb += 3) {
+		rgb[0] = src[0];
+		rgb[1] = src[1];
+		rgb[2] = src[2];
+		x++;
+		if (0 == (x%s))
+		    src += 3;
+	    }
+	    for (scrline = ida->line*s; scrline < ida->line*s+s; scrline++) {
+		rgb = ida->rgb_line;
+		dst = ida->dither_line;
+		dither_line(rgb, dst, scrline, ida->scrwidth);
+		for (x = 0; x < ida->scrwidth; x++, dst++)
+		    XPutPixel(ida->ximage, x, scrline, x11_map[*dst]);
+	    }
+	} else {
+	    for (scrline = ida->line*s; scrline < ida->line*s+s; scrline++) {
+		src = scanline;
+		for (x = 0; x < ida->scrwidth; src += 3) {
+		    unsigned int i;
+		    pix = x11_lut_red[src[0]] |
+			x11_lut_green[src[1]] |
+			x11_lut_blue[src[2]];
+		    for (i = 0; i < s; i++, x++)
+			XPutPixel(ida->ximage, x, scrline, pix);
+		}
+	    }
+	}
+    }
+}
+
+/* ----------------------------------------------------------------------- */
+
+static void
+viewer_cleanup(struct ida_viewer *ida)
+{
+    if (ida->load_read) {
+	ida->load_done(ida->load_data);
+	ida->load_line = 0;
+	ida->load_read = NULL;
+	ida->load_done = NULL;
+	ida->load_data = NULL;
+    }
+    if (ida->op_work) {
+	ida->op_done(ida->op_data);
+	ida->op_line = 0;
+	ida->op_work = NULL;
+	ida->op_done = NULL;
+	ida->op_data = NULL;
+	if (ida->op_src.data) {
+	    if (ida->undo.data) {
+		fprintf(stderr,"have undo buffer /* shouldn't happen */");
+		free(ida->undo.data);
+	    }
+	    ida->undo = ida->op_src;
+	    memset(&ida->op_src,0,sizeof(ida->op_src));
+	}
+    }
+}
+
+static Boolean
+viewer_workproc(XtPointer client_data)
+{
+    struct ida_viewer *ida = client_data;
+    unsigned int start,end;
+    char *scanline;
+
+    start = ida->line;
+    end   = ida->line + ida->steps;
+    if (end > ida->img.i.height)
+	end = ida->img.i.height;
+
+    /* image loading */
+    if (ida->load_read) {
+	for (ida->line = start; ida->line < end; ida->line++) {
+	    if (ida->load_line > ida->line)
+		continue;
+	    scanline = ida->img.data + ida->img.i.width * ida->load_line * 3;
+	    ida->load_read(scanline,ida->load_line,ida->load_data);
+	    ida->load_line++;
+	}
+    }
+
+    /* image processing */
+    if (ida->op_work  &&  0 == ida->op_preview) {
+	for (ida->line = start; ida->line < end; ida->line++) {
+	    if (ida->op_line > ida->line)
+		continue;
+	    scanline = ida->img.data + ida->img.i.width * ida->op_line * 3;
+	    ida->op_work(&ida->op_src,&ida->op_rect,
+			scanline,ida->op_line,ida->op_data);
+	    ida->op_line++;
+	}
+    }
+
+    /* image rendering */
+    if (ida->op_work  && ida->op_preview) {
+	for (ida->line = start; ida->line < end; ida->line++) {
+	    ida->op_line = ida->line;
+	    ida->op_work(&ida->img,&ida->op_rect,
+			 ida->preview_line,ida->line,ida->op_data);
+	    viewer_renderline(ida,ida->preview_line);
+	}
+    } else {
+	for (ida->line = start; ida->line < end; ida->line++) {
+	    scanline = ida->img.data + ida->img.i.width * ida->line * 3;
+	    viewer_renderline(ida,scanline);
+	}
+    }
+
+    /* trigger redraw */
+    XClearArea(XtDisplay(ida->widget), XtWindow(ida->widget),
+	       0, viewer_i2s(ida->zoom,start),
+	       ida->scrwidth, viewer_i2s(ida->zoom,ida->steps), True);
+
+    /* all done ? */
+    if (ida->line == ida->img.i.height) {
+	viewer_cleanup(ida);
+	ida->wproc = 0;
+#if 1
+	if (args.testload)
+	    XtCallActionProc(ida->widget,"Next",NULL,NULL,0);
+#endif
+	return TRUE;
+    }
+    return FALSE;
+}
+
+static void viewer_workstart(struct ida_viewer *ida)
+{
+    /* (re-) start */
+    ida->line  = 0;
+    if (!ida->wproc)
+	ida->wproc = XtAppAddWorkProc(app_context,viewer_workproc,ida);
+}
+
+static void viewer_workstop(struct ida_viewer *ida)
+{
+    if (!ida->wproc)
+	return;
+
+    viewer_cleanup(ida);
+    XtRemoveWorkProc(ida->wproc);
+    ida->wproc = 0;
+}
+
+static void viewer_workfinish(struct ida_viewer *ida)
+{
+    char *scanline;
+
+    if (ida->load_read) {
+	for (ida->line = ida->load_line; ida->line < ida->img.i.height;) {
+	    scanline = ida->img.data + ida->img.i.width * ida->line * 3;
+	    ida->load_read(scanline,ida->load_line,ida->load_data);
+	    ida->line++;
+	    ida->load_line++;
+	}
+    }
+    if (ida->op_work && 0 == ida->op_preview) {
+	for (ida->line = ida->op_line; ida->line < ida->img.i.height;) {
+	    scanline = ida->img.data + ida->img.i.width * ida->line * 3;
+	    ida->op_work(&ida->op_src,&ida->op_rect,
+			scanline,ida->op_line,ida->op_data);
+	    ida->line++;
+	    ida->op_line++;
+	}
+    }
+    viewer_workstop(ida);
+}
+
+/* ----------------------------------------------------------------------- */
+
+static void
+viewer_new_view(struct ida_viewer *ida)
+{
+    if (NULL != ida->ximage)
+	x11_destroy_ximage(ida->widget,ida->ximage,ida->ximage_shm);
+    if (NULL != ida->rgb_line)
+	free(ida->rgb_line);
+    if (NULL != ida->dither_line)
+	free(ida->dither_line);
+    if (NULL != ida->preview_line)
+	free(ida->preview_line);
+
+    ida->scrwidth  = viewer_i2s(ida->zoom,ida->img.i.width);
+    ida->scrheight = viewer_i2s(ida->zoom,ida->img.i.height);
+    ida->steps = PROCESS_LINES;
+    if (ida->zoom < 0)
+	while ((ida->steps % (-ida->zoom+1)) != 0)
+	    ida->steps++;
+
+    ida->rgb_line = malloc(ida->scrwidth*3);
+    ida->dither_line = malloc(ida->scrwidth);
+    ida->preview_line = malloc(ida->img.i.width*3);
+    ida->ximage = x11_create_ximage(ida->widget, ida->scrwidth, ida->scrheight,
+				   &ida->ximage_shm);
+    if (NULL == ida->ximage) {
+	ida->zoom--;
+	return viewer_new_view(ida);
+    }
+    XtVaSetValues(ida->widget,
+		  XtNwidth,  ida->scrwidth,
+		  XtNheight, ida->scrheight,
+		  NULL);
+    viewer_workstart(ida);
+}
+
+static void
+viewer_timeout(XtPointer client_data, XtIntervalId *id);
+
+static int
+viewer_rubber_draw(struct ida_viewer *ida)
+{
+    XGCValues values;
+    struct ida_rect r = ida->current;
+    int x,y,w,h;
+
+    values.function   = GXxor;
+    values.foreground = ida->mask;
+    XChangeGC(dpy,ida->wgc,GCFunction|GCForeground,&values);
+    if (r.x1 < r.x2) {
+	x = viewer_i2s(ida->zoom,r.x1);
+	w = viewer_i2s(ida->zoom,r.x2 - r.x1);
+    } else {
+	x = viewer_i2s(ida->zoom,r.x2);
+	w = viewer_i2s(ida->zoom,r.x1 - r.x2);
+    }
+    if (r.y1 < r.y2) {
+	y = viewer_i2s(ida->zoom,r.y1);
+	h = viewer_i2s(ida->zoom,r.y2 - r.y1);
+    } else {
+	y = viewer_i2s(ida->zoom,r.y2);
+	h = viewer_i2s(ida->zoom,r.y1 - r.y2);
+    }
+    if (0 == h && 0 == w)
+	return 0;
+    if (w)
+	w--;
+    if (h)
+	h--;
+    XDrawRectangle(dpy,XtWindow(ida->widget),ida->wgc,x,y,w,h);
+    return 1;
+}
+
+static void
+viewer_rubber_off(struct ida_viewer *ida)
+{
+    if (ida->marked)
+	viewer_rubber_draw(ida);
+    ida->marked = 0;
+    if (ida->timer)
+	XtRemoveTimeOut(ida->timer);
+    ida->timer = 0;
+}
+
+static void
+viewer_rubber_on(struct ida_viewer *ida)
+{
+    ida->marked = viewer_rubber_draw(ida);
+    if (ida->marked)
+	ida->timer = XtAppAddTimeOut(app_context,RUBBER_INTERVAL,
+				    viewer_timeout,ida);
+}
+
+static void
+viewer_timeout(XtPointer client_data, XtIntervalId *id)
+{
+    struct ida_viewer *ida = client_data;
+
+    ida->timer = 0;
+    viewer_rubber_off(ida);
+    ida->mask <<= 1;
+    if ((ida->mask & 0x10) == 0x10)
+	ida->mask |= 0x01;
+    viewer_rubber_on(ida);
+}
+
+static void
+viewer_redraw(Widget widget, XtPointer client_data,
+	      XEvent *ev, Boolean *cont)
+{
+    struct ida_viewer *ida = client_data;
+    XExposeEvent *event;
+    XGCValues values;
+
+    if (ev->type != Expose)
+	return;
+    event = (XExposeEvent*)ev;
+    
+    if (NULL == ida->ximage)
+	return;
+    if (event->x + event->width > (int)ida->scrwidth)
+	return;
+    if (event->y + event->height > (int)ida->scrheight)
+	return;
+    if (NULL == ida->wgc)
+	ida->wgc = XCreateGC(XtDisplay(widget), XtWindow(widget), 0, NULL);
+
+    viewer_rubber_off(ida);
+    values.function   = GXcopy;
+    XChangeGC(dpy,ida->wgc,GCFunction,&values);
+    XPUTIMAGE(XtDisplay(ida->widget), XtWindow(widget),
+	      ida->wgc, ida->ximage,
+	      event->x, event->y, event->x, event->y,
+	      event->width, event->height);
+    viewer_rubber_on(ida);
+}
+
+static int
+viewer_pos2state(struct ida_viewer *ida, int x, int y)
+{
+    int x1,x2,y1,y2;
+
+    if (POINTER_PICK == ida->state)
+	return ida->state;
+
+    x1 = viewer_i2s(ida->zoom,ida->current.x1);
+    x2 = viewer_i2s(ida->zoom,ida->current.x2);
+    y1 = viewer_i2s(ida->zoom,ida->current.y1);
+    y2 = viewer_i2s(ida->zoom,ida->current.y2);
+    if ((x1 < x && x < x2) || (x2 < x && x < x1)) {
+	if (y1-RUBBER_RANGE < y && y < y1+RUBBER_RANGE)
+	    return RUBBER_Y1;
+	if (y2-RUBBER_RANGE < y && y < y2+RUBBER_RANGE)
+	    return RUBBER_Y2;
+    }
+    if ((y1 < y && y < y2) || (y2 < y && y < y1)) {
+	if (x1-RUBBER_RANGE < x && x < x1+RUBBER_RANGE)
+	    return RUBBER_X1;
+	if (x2-RUBBER_RANGE < x && x < x2+RUBBER_RANGE)
+	    return RUBBER_X2;
+    }
+    if (((x1 < x && x < x2) || (x2 < x && x < x1)) &&
+	((y1 < y && y < y2) || (y2 < y && y < y1)))
+	return RUBBER_MOVE;
+    return RUBBER_NEW;
+}
+
+static void
+viewer_mouse(Widget widget, XtPointer client_data,
+	     XEvent *ev, Boolean *cont)
+{
+    struct ida_viewer *ida = client_data;
+    int state = POINTER_NORMAL;
+    unsigned char *pix;
+    int x,y;
+    
+    viewer_rubber_off(ida);
+
+    switch (ev->type) {
+    case ButtonPress:
+    {
+	XButtonEvent *eb = (XButtonEvent*)ev;
+
+	if (eb->button != Button1)
+	    goto out;
+	ida->state = viewer_pos2state(ida,eb->x,eb->y);
+	switch (ida->state) {
+	case POINTER_PICK:
+	    x = viewer_i2s(-ida->zoom,eb->x);
+	    y = viewer_i2s(-ida->zoom,eb->y);
+	    pix = ida->img.data + ida->img.i.width*y*3 + x*3;
+	    ida->pick_cb(x,y,pix,ida->pick_data);
+	    ida->pick_cb = NULL;
+	    ida->pick_data = NULL;
+	    ida->state = POINTER_NORMAL;
+	    state = POINTER_NORMAL;
+	    break;
+	case RUBBER_NEW:
+	    ida->mask = 0x33333333;
+	    ida->current.x1 = ida->current.x2 = viewer_i2s(-ida->zoom,eb->x);
+	    ida->current.y1 = ida->current.y2 = viewer_i2s(-ida->zoom,eb->y);
+	    break;
+	case RUBBER_MOVE:
+	    ida->last_x = viewer_i2s(-ida->zoom,eb->x);
+	    ida->last_y = viewer_i2s(-ida->zoom,eb->y);
+	    break;
+	case RUBBER_X1:
+	    ida->current.x1 = viewer_i2s(-ida->zoom,eb->x);
+	    break;
+	case RUBBER_Y1:
+	    ida->current.y1 = viewer_i2s(-ida->zoom,eb->y);
+	    break;
+	case RUBBER_X2:
+	    ida->current.x2 = viewer_i2s(-ida->zoom,eb->x);
+	    break;
+	case RUBBER_Y2:
+	    ida->current.y2 = viewer_i2s(-ida->zoom,eb->y);
+	    break;
+	}
+	state = ida->state;
+	break;
+    }
+    case MotionNotify:
+    {
+	XMotionEvent *em = (XMotionEvent*)ev;
+
+	if (!(em->state & Button1Mask)) {
+	    state = viewer_pos2state(ida,em->x,em->y);
+	    goto out;
+	}
+	switch (ida->state) {
+	case RUBBER_NEW:
+	    ida->current.x2 = viewer_i2s(-ida->zoom,em->x);
+	    ida->current.y2 = viewer_i2s(-ida->zoom,em->y);
+	    if (em->state & ShiftMask) {
+		/* square selection */
+		int xlen,ylen;
+		xlen = abs(ida->current.x1 - ida->current.x2);
+		ylen = abs(ida->current.y1 - ida->current.y2);
+		if (ylen > xlen) {
+		    if (ida->current.x1 < ida->current.x2)
+			ida->current.x2 -= (xlen - ylen);
+		    else
+			ida->current.x2 += (xlen - ylen);
+		} else {
+		    if (ida->current.y1 < ida->current.y2)
+			ida->current.y2 -= (ylen - xlen);
+		    else
+			ida->current.y2 += (ylen - xlen);
+		}
+	    }
+	    break;
+	case RUBBER_MOVE:
+	    x = viewer_i2s(-ida->zoom,em->x);
+	    y = viewer_i2s(-ida->zoom,em->y);
+	    ida->current.x1 += (x - ida->last_x);
+	    ida->current.x2 += (x - ida->last_x);
+	    ida->current.y1 += (y - ida->last_y);
+	    ida->current.y2 += (y - ida->last_y);
+	    ida->last_x = x;
+	    ida->last_y = y;
+	    break;
+	case RUBBER_X1:
+	    ida->current.x1 = viewer_i2s(-ida->zoom,em->x);
+	    break;
+	case RUBBER_Y1:
+	    ida->current.y1 = viewer_i2s(-ida->zoom,em->y);
+	    break;
+	case RUBBER_X2:
+	    ida->current.x2 = viewer_i2s(-ida->zoom,em->x);
+	    break;
+	case RUBBER_Y2:
+	    ida->current.y2 = viewer_i2s(-ida->zoom,em->y);
+	    break;
+	}
+	state = ida->state;
+	break;
+    }
+    case ButtonRelease:
+    {
+	XButtonEvent *eb = (XButtonEvent*)ev;
+
+	if (eb->button != Button1)
+	    goto out;
+	ida->state = POINTER_NORMAL;
+	state = ida->state;
+	break;
+    }
+    }
+
+    if (ida->current.x1 < 0)
+	ida->current.x1 = 0;
+    if (ida->current.x1 > ida->img.i.width)
+	ida->current.x1 = ida->img.i.width;
+    if (ida->current.x2 < 0)
+	ida->current.x2 = 0;
+    if (ida->current.x2 > ida->img.i.width)
+	ida->current.x2 = ida->img.i.width;
+    if (ida->current.y1 < 0)
+	ida->current.y1 = 0;
+    if (ida->current.y1 > ida->img.i.height)
+	ida->current.y1 = ida->img.i.height;
+    if (ida->current.y2 < 0)
+	ida->current.y2 = 0;
+    if (ida->current.y2 > ida->img.i.height)
+	ida->current.y2 = ida->img.i.height;
+
+ out:
+    XDefineCursor(dpy, XtWindow(widget), ptrs[state]);
+    viewer_rubber_on(ida);
+}
+
+/* ----------------------------------------------------------------------- */
+/* public stuff                                                            */
+
+void viewer_pick(struct ida_viewer *ida, viewer_pick_cb cb, XtPointer data)
+{
+    if (POINTER_NORMAL != ida->state)
+	return;
+    if (debug)
+	fprintf(stderr,"viewer_pick\n");
+    ida->state = POINTER_PICK;
+    ida->pick_cb   = cb;
+    ida->pick_data = data;
+}
+
+void viewer_unpick(struct ida_viewer *ida)
+{
+    if (POINTER_PICK != ida->state)
+	return;
+    if (debug)
+	fprintf(stderr,"viewer_unpick\n");
+    ida->state = POINTER_NORMAL;
+    ida->pick_cb   = NULL;
+    ida->pick_data = NULL;
+}
+
+void
+viewer_autozoom(struct ida_viewer *ida)
+{
+    if (GET_AUTOZOOM()) {
+	ida->zoom = 0;
+	while (XtScreen(ida->widget)->width  < viewer_i2s(ida->zoom,ida->img.i.width) ||
+	       XtScreen(ida->widget)->height < viewer_i2s(ida->zoom,ida->img.i.height))
+	    ida->zoom--;
+    }
+    viewer_new_view(ida);
+}
+
+void
+viewer_setzoom(struct ida_viewer *ida, int zoom)
+{
+    ida->zoom = zoom;
+    viewer_new_view(ida);
+}
+
+static void
+viewer_op_rect(struct ida_viewer *ida)
+{
+    if (ida->current.x1 == ida->current.x2 &&
+	ida->current.y1 == ida->current.y2) {
+	/* full image */
+	ida->op_rect.x1 = 0;
+	ida->op_rect.x2 = ida->img.i.width;
+	ida->op_rect.y1 = 0;
+	ida->op_rect.y2 = ida->img.i.height;
+	return;
+    } else {
+	/* have selection */
+	if (ida->current.x1 < ida->current.x2) {
+	    ida->op_rect.x1 = ida->current.x1;
+	    ida->op_rect.x2 = ida->current.x2;
+	} else {
+	    ida->op_rect.x1 = ida->current.x2;
+	    ida->op_rect.x2 = ida->current.x1;
+	}
+	if (ida->current.y1 < ida->current.y2) {
+	    ida->op_rect.y1 = ida->current.y1;
+	    ida->op_rect.y2 = ida->current.y2;
+	} else {
+	    ida->op_rect.y1 = ida->current.y2;
+	    ida->op_rect.y2 = ida->current.y1;
+	}
+    }
+}
+
+int
+viewer_start_op(struct ida_viewer *ida, struct ida_op *op, void *parm)
+{
+    struct ida_image dst;
+
+    ptr_busy();
+    viewer_workfinish(ida);
+    viewer_rubber_off(ida);
+
+    /* try init */
+    viewer_op_rect(ida);
+    if (debug)
+	fprintf(stderr,"viewer_start_op: init %s(%p)\n",op->name,parm);
+    ida->op_data = op->init(&ida->img,&ida->op_rect,&dst.i,parm);
+    ptr_idle();
+    if (NULL == ida->op_data)
+	return -1;
+    dst.data = malloc(dst.i.width * dst.i.height * 3);
+
+    /* prepare background processing */
+    if (ida->undo.data) {
+	free(ida->undo.data);
+	memset(&ida->undo,0,sizeof(ida->undo));
+    }
+    if (ida->op_src.data) {
+	fprintf(stderr,"have op_src buffer /* shouldn't happen */");
+	free(ida->op_src.data);
+    }
+    ida->op_src = ida->img;
+    ida->img = dst;
+    ida->op_line = 0;
+    ida->op_work = op->work;
+    ida->op_done = op->done;
+    ida->op_preview = 0;
+
+    if (ida->op_src.i.width  != ida->img.i.width ||
+	ida->op_src.i.height != ida->img.i.height) {
+	memset(&ida->current,0,sizeof(ida->current));
+	viewer_autozoom(ida);
+    } else
+	viewer_new_view(ida);
+    return 0;
+}
+
+int
+viewer_undo(struct ida_viewer *ida)
+{
+    int resize;
+
+    viewer_workfinish(ida);
+    if (NULL == ida->undo.data)
+	return -1;
+    viewer_rubber_off(ida);
+    memset(&ida->current,0,sizeof(ida->current));
+    
+    resize = (ida->undo.i.width  != ida->img.i.width ||
+	      ida->undo.i.height != ida->img.i.height);
+    free(ida->img.data);
+    ida->img = ida->undo;
+    memset(&ida->undo,0,sizeof(ida->undo));
+
+    if (resize)
+	viewer_autozoom(ida);
+    else
+	viewer_new_view(ida);
+    return 0;
+}
+
+int
+viewer_start_preview(struct ida_viewer *ida, struct ida_op *op, void *parm)
+{
+    struct ida_image dst;
+
+    viewer_workfinish(ida);
+
+    /* try init */
+    viewer_op_rect(ida);
+    ida->op_data = op->init(&ida->img,&ida->op_rect,&dst.i,parm);
+    if (NULL == ida->op_data)
+	return -1;
+
+    /* prepare background preview */
+    ida->op_line = 0;
+    ida->op_work = op->work;
+    ida->op_done = op->done;
+    ida->op_preview = 1;
+
+    viewer_workstart(ida);
+    return 0;
+}
+
+int
+viewer_cancel_preview(struct ida_viewer *ida)
+{
+    viewer_workstop(ida);
+    viewer_workstart(ida);
+    return 0;
+}
+
+int
+viewer_loader_start(struct ida_viewer *ida, struct ida_loader *loader,
+		    FILE *fp, char *filename, unsigned int page)
+{
+    struct ida_image_info info;
+    void *data;
+
+    /* init loader */
+    ptr_busy();
+    memset(&info,0,sizeof(info));
+    data = loader->init(fp,filename,page,&info,0);
+    ptr_idle();
+    if (NULL == data) {
+	fprintf(stderr,"loading %s [%s] FAILED\n",filename,loader->name);
+	if (fp)
+	    hex_display(filename);
+	return -1;
+    }
+
+    /* ok, going to load new image */
+    viewer_workstop(ida);
+    viewer_rubber_off(ida);
+    memset(&ida->current,0,sizeof(ida->current));
+    if (ida->undo.data) {
+	free(ida->undo.data);
+	memset(&ida->undo,0,sizeof(ida->undo));
+    }
+    if (NULL != ida->img.data)
+	free(ida->img.data);
+    ida->file       = filename;
+    ida->img.i      = info;
+    ida->img.data   = malloc(ida->img.i.width * ida->img.i.height * 3);
+    
+    /* prepare background loading */
+    ida->load_line = 0;
+    ida->load_read = loader->read;
+    ida->load_done = loader->done;
+    ida->load_data = data;
+    
+    viewer_autozoom(ida);
+    return info.npages;
+}
+
+int
+viewer_loadimage(struct ida_viewer *ida, char *filename, unsigned int page)
+{
+    struct list_head  *item;
+    struct ida_loader *loader;
+    char blk[512];
+    FILE *fp;
+
+    if (NULL == (fp = fopen(filename, "r"))) {
+	fprintf(stderr,"fopen %s: %s\n",filename,strerror(errno));
+        return -1;
+    }
+    if (debug)
+	fprintf(stderr,"load: %s\n",filename);
+    memset(blk,0,sizeof(blk));
+    fread(blk,1,sizeof(blk),fp);
+    rewind(fp);
+
+    /* pick loader */
+    list_for_each(item,&loaders) {
+        loader = list_entry(item, struct ida_loader, list);
+#if 0
+	if (NULL == loader->magic)
+	    break;
+#else
+	if (NULL == loader->magic)
+	    continue;
+#endif
+	if (0 == memcmp(blk+loader->moff,loader->magic,loader->mlen))
+	    return viewer_loader_start(ida,loader,fp,filename,page);
+    }
+    fprintf(stderr,"%s: unknown format\n",filename);
+    hex_display(filename);
+    fclose(fp);
+    return -1;
+}
+
+int
+viewer_setimage(struct ida_viewer *ida, struct ida_image *img, char *name)
+{
+    /* ok, going to load new image */
+    viewer_workstop(ida);
+    viewer_rubber_off(ida);
+    memset(&ida->current,0,sizeof(ida->current));
+    if (ida->undo.data) {
+	free(ida->undo.data);
+	memset(&ida->undo,0,sizeof(ida->undo));
+    }
+
+    if (NULL != ida->img.data)
+	free(ida->img.data);
+    ida->file       = name;
+    ida->img        = *img;
+
+    viewer_autozoom(ida);
+    return 0;
+}
+
+struct ida_viewer*
+viewer_init(Widget widget)
+{
+    Colormap cmap = DefaultColormapOfScreen(XtScreen(widget));
+    struct ida_viewer *ida;
+    XColor white,red,dummy;
+    unsigned int i;
+
+    ida = malloc(sizeof(*ida));
+    memset(ida,0,sizeof(*ida));
+    ida->widget = widget;
+    XtAddEventHandler(widget,ExposureMask,False,viewer_redraw,ida);
+    XtAddEventHandler(widget,
+		      ButtonPressMask   |
+		      ButtonReleaseMask |
+		      PointerMotionMask,
+		      False,viewer_mouse,ida);
+
+    ptrs[POINTER_NORMAL] = XCreateFontCursor(dpy,XC_left_ptr);
+    ptrs[POINTER_BUSY]   = XCreateFontCursor(dpy,XC_watch);
+    ptrs[POINTER_PICK]   = XCreateFontCursor(dpy,XC_tcross);
+    ptrs[RUBBER_NEW]     = XCreateFontCursor(dpy,XC_left_ptr);
+    ptrs[RUBBER_MOVE]    = XCreateFontCursor(dpy,XC_fleur);
+    ptrs[RUBBER_X1]      = XCreateFontCursor(dpy,XC_sb_h_double_arrow);
+    ptrs[RUBBER_X2]      = XCreateFontCursor(dpy,XC_sb_h_double_arrow);
+    ptrs[RUBBER_Y1]      = XCreateFontCursor(dpy,XC_sb_v_double_arrow);
+    ptrs[RUBBER_Y2]      = XCreateFontCursor(dpy,XC_sb_v_double_arrow);
+    if (XAllocNamedColor(dpy,cmap,"white",&white,&dummy) &&
+	XAllocNamedColor(dpy,cmap,"red",&red,&dummy))
+	for (i = 0; i < sizeof(ptrs)/sizeof(Cursor); i++)
+	    XRecolorCursor(dpy,ptrs[i],&red,&white);
+
+    return ida;
+}