added xdemo

tests/xdemo/README.txt

@@ -0,0 +1,3 @@
+
+this is a project to develope a program to test xwindows
+

tests/xdemo/bmp_parser.c

@@ -0,0 +1,204 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include "common.h"
+
+// multi byte values are stored in little endian
+
+struct bmp_magic
+{
+    char magic[2];
+};
+
+struct bmp_hdr
+{
+    uint32_t size;        // file size in bytes
+    uint16_t reserved1;
+    uint16_t reserved2;
+    uint32_t offset;      // offset to image data, in bytes
+};
+
+struct dib_hdr
+{
+    uint32_t  hdr_size;
+    int32_t   width;
+    int32_t   height;
+    uint16_t  nplanes;
+    uint16_t  bpp;
+    uint32_t  compress_type;
+    uint32_t  image_size;
+    int32_t   hres;
+    int32_t   vres;
+    uint32_t  ncolors;
+    uint32_t  nimpcolors;
+};
+
+// forward declarations
+int parse_bmp(char *filename, struct pic_info *pic_info);
+int parse_bmp_24(struct bmp_hdr *bmp_hdr, struct dib_hdr *dib_hdr, int fd, struct pic_info *pic_info);
+
+int parse_bmp(char *filename, struct pic_info *pic_info)
+{
+    int  got_magic;
+    int  fd;
+    int  rval;
+
+    struct bmp_magic   magic;
+    struct bmp_hdr     bmp_hdr;
+    struct dib_hdr     dib_hdr;
+
+    if ((fd = open(filename, O_RDONLY)) < 0) {
+        printf("error opeing %s\n", filename);
+        return -1;
+    }
+
+    // read BMP magic...
+    if ((rval = read(fd, magic.magic, 2)) != 2) {
+        fprintf(stderr, "error reading BMP signature from file %s\n", filename);
+        return -1;
+    }
+
+    got_magic = 0;
+
+    // ...and confirm that this is indeed a BMP file
+    if ((magic.magic[0] == 'B') && (magic.magic[1] == 'M')) {
+        // BM – Windows 3.1x, 95, NT, ... etc
+        got_magic = 1;
+    }
+    else if ((magic.magic[0] == 'B') && (magic.magic[1] == 'A')) {
+        // BA – OS/2 struct Bitmap Array
+        got_magic = 1;
+    }
+    else if ((magic.magic[0] == 'C') && (magic.magic[1] == 'I')) {
+        // CI – OS/2 struct Color Icon
+        got_magic = 1;
+    }
+    else if ((magic.magic[0] == 'C') && (magic.magic[1] == 'P')) {
+        // CP – OS/2 const Color Pointer
+        got_magic = 1;
+    }
+    else if ((magic.magic[0] == 'I') && (magic.magic[1] == 'C')) {
+        // IC – OS/2 struct Icon
+        got_magic = 1;
+    }
+    else if ((magic.magic[0] == 'P') && (magic.magic[1] == 'T')) {
+        // PT – OS/2 Pointer
+        got_magic = 1;
+    }
+
+    if (!got_magic) {
+        fprintf(stderr, "%s is not a valid BMP file\n", filename);
+        return -1;
+    }
+
+    // read BMP header
+    if ((rval = read(fd, &bmp_hdr, sizeof(bmp_hdr))) < sizeof(bmp_hdr)) {
+        fprintf(stderr, "error BMP header from file %s\n", filename);
+        return -1;
+    }
+
+    // read DIB header
+    if ((rval = read(fd, &dib_hdr, sizeof(dib_hdr))) < sizeof(dib_hdr)) {
+        fprintf(stderr, "error reading DIB header from file %s\n", filename);
+        return -1;
+    }
+
+#if 0
+    printf("header size:   %d\n", dib_hdr.hdr_size);
+    printf("width:         %d\n", dib_hdr.width);
+    printf("height:        %d\n", dib_hdr.height);
+    printf("num planes:    %d\n", dib_hdr.nplanes);
+    printf("bpp:           %d\n", dib_hdr.bpp);
+    printf("comp type:     %d\n", dib_hdr.compress_type);
+    printf("image size:    %d\n", dib_hdr.image_size);
+    printf("hres:          %d\n", dib_hdr.hres);
+    printf("vres:          %d\n", dib_hdr.vres);
+    printf("ncolors:       %d\n", dib_hdr.ncolors);
+    printf("nimpcolors:    %d\n", dib_hdr.nimpcolors);
+#endif
+
+    if (dib_hdr.compress_type) {
+        printf("TODO: compressed images not yet supported\n");
+        return -1;
+    }
+
+    pic_info->width = dib_hdr.width;
+    pic_info->height = dib_hdr.height;
+
+    if (dib_hdr.bpp == 24) {
+        rval = parse_bmp_24(&bmp_hdr, &dib_hdr, fd, pic_info);
+    }
+    close(fd);
+    return rval;
+}
+
+/**
+ * extract 24bit BMP data from image file
+ *
+ * @return 0 on success
+ * @return -1 on failure
+ */
+
+int parse_bmp_24(
+    struct bmp_hdr  *bmp_hdr,
+    struct dib_hdr  *dib_hdr,
+    int             fd,
+    struct pic_info *pic_info
+)
+{
+    char *file_data;
+    char *ptr_file_data;
+    char *mem_data;
+    char *ptr_mem_data;
+    char *cptr;
+
+    int  w = dib_hdr->width;    // picture width
+    int  h = dib_hdr->height;   // picture height
+    int  bpl;                   // bytes per line
+    int  bytes;
+    int  i;
+    int  j;
+
+    // bytes per image line = width x bytes_per_pixel + padding
+    i = (w * 3) % 4;
+    j = (i == 0) ? 0 : 4 - i;
+    bpl = w * 3 + j;
+
+    // 24 bit depth, no alpha channel
+    file_data = (char *) malloc(h * bpl);
+
+    // point to first line in image data, which is stored in reverse order
+    ptr_file_data = (file_data + dib_hdr->image_size) - bpl;
+
+    // 24 bit depth, with alpha channel
+    mem_data  = (char *) malloc(w * h * 4);
+    ptr_mem_data = mem_data;
+
+    pic_info->pixel_data = ptr_mem_data;
+
+    // seek to beginning of pixel data
+    lseek(fd, bmp_hdr->offset, SEEK_SET);
+
+    // read all pixel data
+    bytes = read(fd, file_data, dib_hdr->image_size);
+
+    // convert 24bit to 24 bit with alpha and store in reverse
+    for (i = 0; i < h; i ++)
+    {
+        cptr = ptr_file_data;
+        for (j = 0; j < w; j++)
+        {
+            *ptr_mem_data++ = *cptr++; // blue value
+            *ptr_mem_data++ = *cptr++; // green value
+            *ptr_mem_data++ = *cptr++; // red value
+            *ptr_mem_data++ = 0;       // alpha channel
+        }
+        ptr_file_data -= bpl;
+    }
+
+    free(file_data);
+    return 0;
+}

tests/xdemo/commit.txt

@@ -0,0 +1 @@
+First commit for the project Ver 1.0

tests/xdemo/common.h

@@ -0,0 +1,19 @@
+#ifndef __XDEMO_H
+#define __XDEMO_H
+
+#define DEBUG
+
+#ifdef DEBUG
+#define dprint(x...) printf(x)
+#else
+#define dprint(x...)
+#endif
+
+struct pic_info
+{
+    int  width;
+    int  height;
+    char *pixel_data;
+};
+
+#endif

tests/xdemo/xdemo.c

@@ -0,0 +1,674 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <time.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <signal.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include "common.h"
+
+// LK_TODO
+// http://tronche.com/gui/x/xlib/GC/convenience-functions/fill-tile-and-stipple.html
+// fill stipple
+
+// drawfonts: XDrawString, XDrawImageString XDrawText XLoadFont XTextExtents
+// http://www.ac3.edu.au/SGI_Developer/books/XLib_PG/sgi_html/apa.html
+// http://www.ac3.edu.au/SGI_Developer/books/XLib_PG/sgi_html/index.html
+
+// use jpg lib to convert bmp to jpg and vice versa
+
+#define MAX_COLORS          5
+#define SCROLL_JUMP         1   // scroll in increments of g_winHeight
+#define SCROLL_SMOOTH1      2   // scroll using XPutImage + XCopyArea
+#define SCROLL_SMOOTH2      3   // scroll using XPutImage only
+
+int parse_bmp(char *filename, struct pic_info *);
+int drawBMP(char *filename, int scroll_type);
+int signal_tcp_proxy(char *proxy_app);
+
+// globals
+Display     *g_disp;
+Window      g_win;
+XColor      g_colors[MAX_COLORS];
+GC          g_gc;
+int         g_winWidth;
+int         g_winHeight;
+int         g_delay_dur;
+
+void start_timer(struct timeval *tv)
+{
+    gettimeofday(tv, NULL);
+}
+
+
+uint32_t time_elapsed_ms(struct timeval tv)
+{
+    struct timeval  tv_now;
+    uint32_t        dur;
+
+    gettimeofday(&tv_now, NULL);
+    dur = ((tv_now.tv_sec - tv.tv_sec) * 1000) + ((tv_now.tv_usec - tv.tv_usec) / 1000);
+    return dur;
+}
+
+
+uint32_t time_elapsed_us(struct timeval tv)
+{
+    struct timeval  tv_now;
+    uint32_t        dur;
+
+    gettimeofday(&tv_now, NULL);
+    dur = ((tv_now.tv_sec - tv.tv_sec) * 1000000) + (tv_now.tv_usec - tv.tv_usec);
+    return dur;
+}
+
+int drawLines(int count)
+{
+    int x1;
+    int y1;
+    int x2;
+    int y2;
+    int i;
+    int index;
+
+    if (count <= 0) {
+        return 0;                  // nothing to do
+    }
+
+    srandom(time(NULL));
+    XClearArea(g_disp, g_win, 0, 0, g_winWidth, g_winHeight, 0);
+
+    for (i = 0, index = 0; i < count; i++)
+    {
+        x1 = random() % g_winWidth;
+        y1 = random() % g_winHeight;
+        x2 = random() % g_winWidth;
+        y2 = random() % g_winHeight;
+        XSetForeground(g_disp, g_gc, g_colors[index++].pixel);
+        if (index == MAX_COLORS) {
+            index = 0;
+        }
+        // from-to
+        XDrawLine(g_disp, g_win, g_gc, x1, y1, x2, y2);
+        XFlush(g_disp);
+        usleep(g_delay_dur);
+    }
+    return 0;
+}
+
+// LK_TODO support user defined w and h
+
+int drawRectangles(int count)
+{
+    int x1;
+    int y1;
+    int w;
+    int h;
+    int i;
+    int index;
+
+    if (count <= 0) {
+        return 0;  // nothing to do
+    }
+
+    srandom(time(NULL));
+    XClearArea(g_disp, g_win, 0, 0, g_winWidth, g_winHeight, 0);
+
+    for (i = 0, index = 0; i < count; i++)
+    {
+        x1 = random() % g_winWidth;
+        y1 = random() % g_winHeight;
+        w = 160;
+        h = 140;
+        XSetForeground(g_disp, g_gc, g_colors[index++].pixel);
+        if (index == MAX_COLORS) {
+            index = 0;
+        }
+        //XDrawRectangle(g_disp, g_win, g_gc, x1, y1, w, h);
+        XFillRectangle(g_disp, g_win, g_gc, x1, y1, w, h);
+        XFlush(g_disp);
+        usleep(g_delay_dur);
+    }
+    return 0;
+}
+
+int drawFont(int count, char *msg)
+{
+    int  x1;
+    int  y1;
+    int  i;
+    int  index;
+
+#ifdef CHANGE_FONT_SIZE
+    int  w;
+    int  h;
+    int  actual_count;
+    char **font_list;
+#endif
+
+    if (count <= 0) {
+        return 0; // nothing to do
+    }
+
+    srandom(time(NULL));
+    XClearArea(g_disp, g_win, 0, 0, g_winWidth, g_winHeight, 0);
+
+#ifdef CHANGE_FONT_SIZE
+    font_list = XListFonts(g_disp, "−*−courier−*−*−*−*−0−0−*−*−*−0−*−*", 2000, &actual_count);
+    if (!font_list) {
+        printf("actual_count=%d\n", actual_count);
+        for (i = 0; i < actual_count; i++)
+        {
+            printf("%s\n", font_list[i]);
+        }
+        XFreeFontNames(font_list);
+    }
+    else {
+        printf("XListFonts() reted NULL\n");
+    }
+#endif
+
+    srandom(time(NULL));
+
+    for (i = 0, index = 0; i < count; i++)
+    {
+        x1 = random() % g_winWidth;
+        y1 = random() % g_winHeight;
+        XSetForeground(g_disp, g_gc, g_colors[index++].pixel);
+        if (index == MAX_COLORS) {
+            index = 0;
+        }
+        XDrawString(g_disp, g_win, g_gc, x1, y1, msg, strlen(msg));
+        XFlush(g_disp);
+        usleep(g_delay_dur);
+    }
+    return 0; // nothing to do
+}
+
+/**
+ * display a usage message
+ */
+
+void
+usage()
+{
+    printf("usage: xdemo [-l] [-r] [-s] [-f <string>] [-i <image file>] [-g <WxH>] [-c <count>] [-o <scroll type>] [-d <delay>] -z\n");
+    printf("         -l                        draw lines\n");
+    printf("         -r                        draw fill rectangles\n");
+    printf("         -s                        draw stipple rectangles\n");
+    printf("         -f <string>               draw string using fonts\n");
+    printf("         -i <image file>           draw image\n");
+    printf("         -g <WxH>                  geometry, default is 640x480\n");
+    printf("         -c <count>                iteration count, default is 5000\n");
+    printf("         -d <delay>                loop delay in micro seconds, default 1000\n");
+    printf("         -o <jump|smooth1|smooth2> define scrolling method\n");
+    printf("         -z <proxy_app>            zero proxy counters for specified application\n\n");
+}
+
+int main(int argc, char **argv)
+{
+    XEvent          evt;
+    Colormap        colormap;
+    struct timeval  tv;
+    int             screenNumber;
+    long            eventMask;
+    unsigned long   white;
+    unsigned long   black;
+    Status          rc;
+    int             iters;
+    int             opt;
+    int             draw_lines;
+    int             draw_rects;
+    int             draw_stipples;
+    int             draw_fonts;
+    int             draw_image;
+    int             zero_counters;
+    int             scroll_type;
+    char            image_file[256];
+    char            proxy_app[256];
+    char            msg[4096];
+
+    // set some defaults
+    g_winWidth = 640;
+    g_winHeight = 480;
+    iters = 5000;
+    draw_lines = 1;
+    draw_rects = 1;
+    draw_stipples = 1;
+    draw_fonts = 1;
+    draw_image = 1;
+    g_delay_dur = 1000;
+    scroll_type = SCROLL_SMOOTH1;
+    zero_counters = 0;
+    strcpy(image_file, "yosemite.bmp");
+    strcpy(msg, "To be or not to be!");
+
+    // process cmd line args
+    opterr = 0;
+    while ((opt = getopt(argc, argv, "lrsg:c:f:i:d:o:z:")) != -1)
+    {
+        switch (opt)
+        {
+        case 'g':
+            if (sscanf(optarg, "%dx%d", &g_winWidth, &g_winHeight) != 2) {
+                fprintf(stderr, "\nerror: invalid geometry specified\n\n");
+                usage();
+                return -1;
+            }
+            break;
+
+        case 'c':
+            if (sscanf(optarg, "%d", &iters) != 1) {
+                fprintf(stderr, "\nerror: invalid count specified\n\n");
+                usage();
+                return -1;
+            }
+            break;
+
+        case 'l':
+            draw_lines = 1;
+            draw_rects = 0;
+            draw_stipples = 0;
+            draw_fonts = 0;
+            draw_image = 0;
+            break;
+
+        case 'r':
+            draw_rects = 1;
+            draw_lines = 0;
+            draw_stipples = 0;
+            draw_fonts = 0;
+            draw_image = 0;
+            break;
+
+        case 's':
+            draw_stipples = 1;
+            draw_lines = 0;
+            draw_rects = 0;
+            draw_fonts = 0;
+            draw_image = 0;
+            break;
+
+        case 'f':
+            if (strlen(optarg) <= 0) {
+                fprintf(stderr, "\nerror: -f option requires an argument\n\n");
+                usage();
+                return -1;
+            }
+            draw_fonts = 1;
+            strncpy(msg, optarg, 4096);
+            draw_lines = 0;
+            draw_rects = 0;
+            draw_stipples = 0;
+            draw_image = 0;
+            break;
+
+        case 'i':
+            if (strlen(optarg) <= 0) {
+                fprintf(stderr, "\nerror: -i option requires an argument\n\n");
+                usage();
+                return -1;
+            }
+            draw_image = 1;
+            strncpy(image_file, optarg, 255);
+            draw_lines = 0;
+            draw_rects = 0;
+            draw_stipples = 0;
+            draw_fonts = 0;
+            break;
+
+        case 'h':
+            usage();
+            return 0;
+            break;
+
+        case 'v':
+            printf("xdemo Ver 1.0\n");
+            return 0;
+            break;
+
+        case 'd':
+            if (sscanf(optarg, "%d", &g_delay_dur) != 1) {
+                fprintf(stderr, "\nerror: -d option requires an argument\n\n");
+                usage();
+                return -1;
+            }
+            break;
+
+        case 'z':
+            if (strlen(optarg) <= 0) {
+                fprintf(stderr, "\nerror: invalid proxy application specified\n\n");
+                usage();
+                return -1;
+            }
+            strcpy(proxy_app, optarg);
+	    printf("##### LK_TODO: proxy_app=%s\n", proxy_app);
+            zero_counters = 1;
+            break;
+
+        case 'o':
+            if (strcmp(optarg, "jump") == 0) {
+                scroll_type = SCROLL_JUMP;
+            }
+            else if (strcmp(optarg, "smooth1") == 0) {
+                scroll_type = SCROLL_SMOOTH1;
+            }
+            else if (strcmp(optarg, "smooth2") == 0) {
+                scroll_type = SCROLL_SMOOTH2;
+            }
+            else {
+                fprintf(stderr, "\ninvalid scroll type specified\n\n");
+                usage();
+                return -1;
+            }
+            break;
+
+        default:
+            usage();
+            return -1;
+        }
+    }
+
+    // must have at least one operation
+    if ((!draw_lines) && (!draw_rects) && (!draw_stipples) &&
+        (!draw_fonts) && (!draw_image)) {
+        usage();
+        return -1;
+    }
+
+    g_disp = XOpenDisplay(NULL);
+    if (!g_disp) {
+        dprint("error opening X display\n");
+        exit(-1);
+    }
+
+    screenNumber = DefaultScreen(g_disp);
+    white = WhitePixel(g_disp, screenNumber);
+    black = BlackPixel(g_disp, screenNumber);
+
+    g_win = XCreateSimpleWindow(g_disp,
+                                DefaultRootWindow(g_disp),
+                                50, 50,                  // origin
+                                g_winWidth, g_winHeight, // size
+                                0, black,                // border
+                                white );                 // backgd
+
+    XMapWindow(g_disp, g_win);
+    //eventMask = StructureNotifyMask | MapNotify | VisibilityChangeMask;
+    eventMask = StructureNotifyMask | VisibilityChangeMask;
+    XSelectInput(g_disp, g_win, eventMask);
+
+    g_gc = XCreateGC(g_disp, g_win,
+        0,                       // mask of values
+        NULL );                  // array of values
+    #if 0
+    do
+    {
+        dprint("about to call XNextEvent(...)\n");
+        XNextEvent(g_disp, &evt);// calls XFlush
+        dprint("returned from XNextEvent(...)\n");
+    }
+    //while(evt.type != MapNotify);
+    while(evt.type != VisibilityNotify);
+    #endif
+
+    // get access to the screen's color map
+    colormap = DefaultColormap(g_disp, screenNumber);
+
+    // alloc red color
+    rc = XAllocNamedColor(g_disp, colormap, "red", &g_colors[0], &g_colors[0]);
+    if (rc == 0) {
+        printf("XAllocNamedColor - failed to allocated 'red' color.\n");
+        exit(1);
+    }
+
+    rc = XAllocNamedColor(g_disp, colormap, "green", &g_colors[1], &g_colors[1]);
+    if (rc == 0) {
+        printf("XAllocNamedColor - failed to allocated 'green' color.\n");
+        exit(1);
+    }
+
+    rc = XAllocNamedColor(g_disp, colormap, "blue", &g_colors[2], &g_colors[2]);
+    if (rc == 0) {
+        printf("XAllocNamedColor - failed to allocated 'blue' color.\n");
+        exit(1);
+    }
+    rc = XAllocNamedColor(g_disp, colormap, "yellow", &g_colors[3], &g_colors[3]);
+    if (rc == 0) {
+        printf("XAllocNamedColor - failed to allocated 'yellow' color.\n");
+        exit(1);
+    }
+    rc = XAllocNamedColor(g_disp, colormap, "orange", &g_colors[4], &g_colors[4]);
+    if (rc == 0) {
+        printf("XAllocNamedColor - failed to allocated 'orange' color.\n");
+        exit(1);
+    }
+
+    if (zero_counters) {
+        signal_tcp_proxy(proxy_app);
+    }
+
+    if (draw_lines) {
+        start_timer(&tv);
+        drawLines(iters);
+        printf("drew %d lines in %d ms\n", iters, time_elapsed_ms(tv));
+    }
+
+    if (draw_rects) {
+        start_timer(&tv);
+        drawRectangles(iters);
+        printf("drew %d rects in %d ms\n", iters, time_elapsed_ms(tv));
+    }
+
+    if (draw_stipples) {
+        start_timer(&tv);
+        // LK_TODO
+    }
+
+    if (draw_fonts) {
+        start_timer(&tv);
+    	drawFont(iters, msg);
+        printf("drew %d strings in %d ms\n", iters, time_elapsed_ms(tv));
+    }
+
+    if (draw_image) {
+        start_timer(&tv);
+        drawBMP(image_file, scroll_type);
+        printf("drew BMP in %d ms\n", time_elapsed_ms(tv));
+    }
+
+    if (zero_counters) {
+        signal_tcp_proxy(proxy_app);
+    }
+
+    eventMask = ButtonPressMask|ButtonReleaseMask;
+
+    XSelectInput(g_disp, g_win, eventMask);
+
+    do
+    {
+        XNextEvent(g_disp, &evt); // calls XFlush()
+    }
+    while(evt.type != ButtonRelease);
+
+    XDestroyWindow(g_disp, g_win);
+    XCloseDisplay(g_disp);
+
+    return 0;
+}
+
+int drawBMP(char *filename, int scroll_type)
+{
+    struct   pic_info pic_info;
+    XImage   *image;
+    Visual   *visual;
+    Pixmap   pixmap;
+    int      depth;
+    int      i;
+    int      j;
+
+    if (parse_bmp(filename, &pic_info) < 0) {
+        exit(-1);
+    }
+    XClearArea(g_disp, g_win, 0, 0, g_winWidth, g_winHeight, 0);
+
+    depth = DefaultDepth(g_disp, DefaultScreen(g_disp));
+    visual = DefaultVisual(g_disp, DefaultScreen(g_disp));
+
+    // create empty pixmap
+    pixmap = XCreatePixmap(g_disp, g_win, pic_info.width, pic_info.height, depth);
+
+    // create an image from pixel data
+    image = XCreateImage(g_disp, visual, depth, ZPixmap, 0, pic_info.pixel_data,
+                         pic_info.width, pic_info.height, 32, 0);
+
+    if (pic_info.height <= g_winHeight) {
+        // image is too small to scroll
+        XFlush(g_disp);
+        XPutImage(g_disp, g_win, g_gc, image, 0, 0, 0, 0, pic_info.width, pic_info.height);
+        XFlush(g_disp);
+        return 0;
+    }
+
+    if (scroll_type == SCROLL_JUMP) {
+        // copy image to pixelmap
+        XPutImage(g_disp, pixmap, g_gc, image, 0, 0, 0, 0, pic_info.width, pic_info.height);
+
+        if (pic_info.height <= g_winHeight) {
+            // image too small - no scrolling required
+            XFlush(g_disp);
+            XCopyArea(g_disp,           // connection to X server
+                      pixmap,           // source drawable
+                      g_win,            // dest drawable
+                      g_gc,             // graphics context
+                      0, 0,             // source x,y
+                      pic_info.width,   // width
+                      pic_info.height,  // height
+                      0, 0);            // dest x,y
+            XFlush(g_disp);
+            return 0;
+        }
+
+        j = pic_info.height / g_winHeight;
+        if (pic_info.height % g_winHeight != 0) {
+            // need to include the last part of the image
+            j++;
+        }
+        XFlush(g_disp);
+        for (i = 0; i < j; i++)
+        {
+            XCopyArea(g_disp,               // connection to X server
+                      pixmap,               // source drawable
+                      g_win,                // dest drawable
+                      g_gc,                 // graphics context
+                      0, i * g_winHeight,   // source x,y
+                      pic_info.width,       // width
+                      pic_info.height,      // height
+                      0, 0);                // dest x,y
+            XFlush(g_disp);
+            sleep(3);
+        }
+    }
+
+    /*
+    ** smooth scroll the image
+    */
+
+    // number of lines to be scrolled
+    j = pic_info.height - g_winHeight;
+
+    if (scroll_type == SCROLL_SMOOTH1) {
+        XFlush(g_disp);
+        XPutImage(g_disp, g_win, g_gc, image, 0, 0, 0, 0, pic_info.width, pic_info.height);
+        XFlush(g_disp);
+        usleep(10000);
+        for (i = 0; i < j; i++)
+        {
+            XCopyArea(g_disp, g_win, g_win, g_gc, 0, 1, g_winWidth, g_winHeight - 1, 0, 0);
+            XPutImage(g_disp, g_win, g_gc, image, 0, g_winHeight + i, 0, g_winHeight -1 , pic_info.width, 1);
+            XFlush(g_disp);
+            usleep(10000);
+        }
+        return 0;
+    }
+
+    if (scroll_type == SCROLL_SMOOTH2) {
+        XFlush(g_disp);
+        for (i = 0; i < j; i++)
+        {
+            XPutImage(g_disp, g_win, g_gc, image, 0, i, 0, 0, pic_info.width, pic_info.height - i);
+            XFlush(g_disp);
+            usleep(10000);
+        }
+    }
+    return 0;
+}
+
+int process_bmp_event()
+{
+    XEvent ev;
+    long   event_mask;
+
+    event_mask = ExposureMask|ButtonPressMask|ButtonReleaseMask|StructureNotifyMask;
+    XSelectInput(g_disp, g_win, event_mask);
+    XNextEvent(g_disp, &ev);
+    switch(ev.type)
+    {
+    case Expose:
+        printf("got expose event\n");
+        break;
+
+    default:
+        printf("did not get expose event\n");
+        break;
+    }
+    return 0;
+}
+
+/**
+ * send a SIGUSR1 to process tcp_proxy, causing it to clear counters
+ *
+ * @return 0 on success, -1 on failure
+ */
+
+int signal_tcp_proxy(char *proc_name)
+{
+    FILE *fp;
+    char *cptr;
+    char buf[2048];
+    int  pids[10];
+    int  status = 0;
+    int  num_procs;
+    int  i;
+
+    sprintf(buf, "pidof %s", proc_name);
+    if ((fp = popen(buf, "r")) == NULL ) {
+        printf("xdemo: popen() failed\n");
+        return -1;
+    }
+
+    cptr = fgets(buf, 2047, fp);
+    if (cptr == NULL) {
+        pclose(fp);
+        return -1;
+    }
+
+    num_procs = sscanf(buf, "%d %d %d %d %d %d %d %d %d %d", 
+                       &pids[0], &pids[1], &pids[2], &pids[3], &pids[4], 
+                       &pids[5], &pids[6], &pids[7], &pids[8], &pids[9]);
+    if (num_procs > 0) {
+        for (i = 0; i < num_procs; i++) {
+            kill(pids[i], SIGUSR1);
+            printf("sent SIGUSR1 to process %d\n", pids[i]);
+        }
+    }
+
+    pclose(fp);
+    return status;
+}
+