Imported from libpng-1.0.5-pre1.tarv1.0.5-pre1

1 files changed, 0 insertions, 1102 deletions

diff --git a/contrib/gregbook/rpng2-win.c b/contrib/gregbook/rpng2-win.c
deleted file mode 100644
index fd32ec4c8..000000000
--- a/contrib/gregbook/rpng2-win.c
+++ /dev/null
@@ -1,1102 +0,0 @@
-/*---------------------------------------------------------------------------
-
-   rpng2 - progressive-model PNG display program                rpng2-win.c 
-
-   This program decodes and displays PNG files progressively, as if it were
-   a web browser (though the front end is only set up to read from files).
-   It supports gamma correction, user-specified background colors, and user-
-   specified background patterns (for transparent images).  This version is
-   for 32-bit Windows; it may compile under 16-bit Windows with a little
-   tweaking (or maybe not).  Thanks to Adam Costello and Pieter S. van der
-   Meulen for the "diamond" and "radial waves" patterns, respectively.
-
-   to do:
-    - stdout/stderr don't work!  need message window (maybe scrollable?)
-    - handle quoted command-line args (especially filenames with spaces)
-    - finish resizable checkerboard-gradient (sizes 4-128?)
-    - use %.1023s to simplify truncation of title-bar string?
-    - have minimum window width:  oh well
-
-  ---------------------------------------------------------------------------
-
-   Changelog:
-    - 1.01:  initial public release
-    - 1.02:  fixed cut-and-paste error in usage screen (oops...)
-
-  ---------------------------------------------------------------------------
-
-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
-
-      This software is provided "as is," without warranty of any kind,
-      express or implied.  In no event shall the author or contributors
-      be held liable for any damages arising in any way from the use of
-      this software.
-
-      Permission is granted to anyone to use this software for any purpose,
-      including commercial applications, and to alter it and redistribute
-      it freely, subject to the following restrictions:
-
-      1. Redistributions of source code must retain the above copyright
-         notice, disclaimer, and this list of conditions.
-      2. Redistributions in binary form must reproduce the above copyright
-         notice, disclaimer, and this list of conditions in the documenta-
-         tion and/or other materials provided with the distribution.
-      3. All advertising materials mentioning features or use of this
-         software must display the following acknowledgment:
-
-            This product includes software developed by Greg Roelofs
-            and contributors for the book, "PNG: The Definitive Guide,"
-            published by O'Reilly and Associates.
-
-  ---------------------------------------------------------------------------*/
-
-#define PROGNAME  "rpng2-win"
-#define LONGNAME  "Progressive PNG Viewer for Windows"
-#define VERSION   "1.02 of 22 September 1999"
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <setjmp.h>	/* for jmpbuf declaration in readpng2.h */
-#include <time.h>
-#include <math.h>	/* only for PvdM background code */
-#include <windows.h>
-
-/* all for PvdM background code: */
-#ifndef PI
-#  define PI             3.141592653589793238
-#endif
-#define PI_2             (PI*0.5)
-#define INV_PI_360       (360.0 / PI)
-#define MAX(a,b)         (a>b?a:b)
-#define MIN(a,b)         (a<b?a:b)
-#define CLIP(a,min,max)  MAX(min,MIN((a),max))
-#define ABS(a)           ((a)<0?-(a):(a))
-#define CLIP8P(c)        MAX(0,(MIN((c),255)))   /* 8-bit pos. integer (uch) */
-#define ROUNDF(f)        ((int)(f + 0.5))
-
-#define rgb1_max   bg_freq
-#define rgb1_min   bg_gray
-#define rgb2_max   bg_bsat
-#define rgb2_min   bg_brot
-
-/* #define DEBUG */	/* this enables the Trace() macros */
-
-#include "readpng2.h"	/* typedefs, common macros, readpng2 prototypes */
-
-
-/* could just include png.h, but this macro is the only thing we need
- * (name and typedefs changed to local versions); note that side effects
- * only happen with alpha (which could easily be avoided with
- * "ush acopy = (alpha);") */
-
-#define alpha_composite(composite, fg, alpha, bg) {			\
-    ush temp = ((ush)(fg)*(ush)(alpha) +				\
-                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);	\
-    (composite) = (uch)((temp + (temp >> 8)) >> 8);			\
-}
-
-
-#define INBUFSIZE 4096	/* with pseudo-timing on (1 sec delay/block), this
-			 *  block size corresponds roughly to a download
-			 *  speed 10% faster than theoretical 33.6K maximum
-			 *  (assuming 8 data bits, 1 stop bit and no other
-			 *  overhead) */
-
-/* local prototypes */
-static void       rpng2_win_init(void);
-static int        rpng2_win_create_window(void);
-static int        rpng2_win_load_bg_image(void);
-static void       rpng2_win_display_row(ulg row);
-static void       rpng2_win_finish_display(void);
-static void       rpng2_win_cleanup(void);
-LRESULT CALLBACK  rpng2_win_wndproc(HWND, UINT, WPARAM, LPARAM);
-
-
-static char titlebar[1024], *window_name = titlebar;
-static char *progname = PROGNAME;
-static char *appname = LONGNAME;
-static char *icon_name = PROGNAME;	/* GRR:  not (yet) used */
-static char *filename;
-static FILE *infile;
-
-static mainprog_info rpng2_info;
-
-static uch inbuf[INBUFSIZE];
-static int incount;
-
-static int pat = 6;		/* must be less than num_bgpat */
-static int bg_image = 0;
-static int bgscale = 16;
-static ulg bg_rowbytes;
-static uch *bg_data;
-
-static struct rgb_color {
-    uch r, g, b;
-} rgb[] = {
-    {  0,   0,   0},	/*  0:  black */
-    {255, 255, 255},	/*  1:  white */
-    {173, 132,  57},	/*  2:  tan */
-    { 64, 132,   0},	/*  3:  medium green */
-    {189, 117,   1},	/*  4:  gold */
-    {253, 249,   1},	/*  5:  yellow */
-    {  0,   0, 255},	/*  6:  blue */
-    {  0,   0, 120},	/*  7:  medium blue */
-    {255,   0, 255},	/*  8:  magenta */
-    { 64,   0,  64},	/*  9:  dark magenta */
-    {255,   0,   0},	/* 10:  red */
-    { 64,   0,   0},	/* 11:  dark red */
-    {255, 127,   0},	/* 12:  orange */
-    {192,  96,   0},	/* 13:  darker orange */
-    { 24,  60,   0},	/* 14:  dark green-yellow */
-    { 85, 125, 200} 	/* 15:  ice blue */
-};
-/* not used for now, but should be for error-checking:
-static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);
- */
-
-/*
-    This whole struct is a fairly cheesy way to keep the number of
-    command-line options to a minimum.  The radial-waves background
-    type is a particularly poor fit to the integer elements of the
-    struct...but a few macros and a little fixed-point math will do
-    wonders for ya.
-
-    type bits:
-       F E D C B A 9 8 7 6 5 4 3 2 1 0
-                             | | | | |
-                             | | +-+-+-- 0 = sharp-edged checkerboard
-                             | |         1 = soft diamonds
-                             | |         2 = radial waves
-                             | |       3-7 = undefined
-                             | +-- gradient #2 inverted?
-                             +-- alternating columns inverted?
- */
-static struct background_pattern {
-    ush type;
-    int rgb1_max, rgb1_min;	/* or bg_freq, bg_gray */
-    int rgb2_max, rgb2_min;	/* or bg_bsat, bg_brot (both scaled by 10)*/
-} bg[] = {
-    {0+8,   2,0,  1,15},  	/* checkered:  tan/black vs. white/ice blue */
-    {0+24,  2,0,  1,0},  	/* checkered:  tan/black vs. white/black */
-    {0+8,   4,5,  0,2},  	/* checkered:  gold/yellow vs. black/tan */
-    {0+8,   4,5,  0,6},  	/* checkered:  gold/yellow vs. black/blue */
-    {0,     7,0,  8,9},  	/* checkered:  deep blue/black vs. magenta */
-    {0+8,  13,0,  5,14},  	/* checkered:  orange/black vs. yellow */
-    {0+8,  12,0, 10,11},  	/* checkered:  orange/black vs. red */
-    {1,     7,0,  8,0},  	/* diamonds:  deep blue/black vs. magenta */
-    {1,    12,0, 11,0},  	/* diamonds:  orange vs. dark red */
-    {1,    10,0,  7,0},  	/* diamonds:  red vs. medium blue */
-    {1,     4,0,  5,0},  	/* diamonds:  gold vs. yellow */
-    {1,     3,0,  0,0},  	/* diamonds:  medium green vs. black */
-    {2,    16, 100,  20,   0},  /* radial:  ~hard radial color-beams */
-    {2,    18, 100,  10,   2},  /* radial:  soft, curved radial color-beams */
-    {2,    16, 256, 100, 250},  /* radial:  very tight spiral */
-    {2, 10000, 256,  11,   0}   /* radial:  dipole-moire' (almost fractal) */
-};
-static int num_bgpat = sizeof(bg) / sizeof(struct background_pattern);
-
-
-/* Windows-specific global variables (could go in struct, but messy...) */
-static ulg wimage_rowbytes;
-static uch *dib;
-static uch *wimage_data;
-static BITMAPINFOHEADER *bmih;
-
-static HWND global_hwnd;
-static HINSTANCE global_hInst;
-static int global_showmode;
-
-
-
-
-int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
-{
-    char *args[1024];		/* arbitrary limit, but should suffice */
-    char *p, *q, *bgstr = NULL, **argv = args;
-    int argc = 0;
-    int rc, alen, flen;
-    int error = 0;
-    int timing = FALSE;
-    int have_bg = FALSE;
-    double LUT_exponent;		/* just the lookup table */
-    double CRT_exponent = 2.2;		/* just the monitor */
-    double default_display_exponent;	/* whole display system */
-    MSG msg;
-
-
-    /* First initialize a few things, just to be sure--memset takes care of
-     * default background color (black), booleans (FALSE), pointers (NULL),
-     * etc. */
-
-    global_hInst = hInst;
-    global_showmode = showmode;
-    filename = (char *)NULL;
-    memset(&rpng2_info, 0, sizeof(mainprog_info));
-
-
-    /* Set the default value for our display-system exponent, i.e., the
-     * product of the CRT exponent and the exponent corresponding to
-     * the frame-buffer's lookup table (LUT), if any.  This is not an
-     * exhaustive list of LUT values (e.g., OpenStep has a lot of weird
-     * ones), but it should cover 99% of the current possibilities.  And
-     * yes, these ifdefs are completely wasted in a Windows program... */
-
-#if defined(NeXT)
-    /* third-party utilities can modify the default LUT exponent */
-    LUT_exponent = 1.0 / 2.2;
-    /*
-    if (some_next_function_that_returns_gamma(&next_gamma))
-        LUT_exponent = 1.0 / next_gamma;
-     */
-#elif defined(sgi)
-    LUT_exponent = 1.0 / 1.7;
-    /* there doesn't seem to be any documented function to
-     * get the "gamma" value, so we do it the hard way */
-    infile = fopen("/etc/config/system.glGammaVal", "r");
-    if (infile) {
-        double sgi_gamma;
-
-        fgets(tmpline, 80, infile);
-        fclose(infile);
-        sgi_gamma = atof(tmpline);
-        if (sgi_gamma > 0.0)
-            LUT_exponent = 1.0 / sgi_gamma;
-    }
-#elif defined(Macintosh)
-    LUT_exponent = 1.8 / 2.61;
-    /*
-    if (some_mac_function_that_returns_gamma(&mac_gamma))
-        LUT_exponent = mac_gamma / 2.61;                 
-     */
-#else
-    LUT_exponent = 1.0;   /* assume no LUT:  most PCs */
-#endif
-
-    /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */
-    default_display_exponent = LUT_exponent * CRT_exponent;
-
-
-    /* If the user has set the SCREEN_GAMMA environment variable as suggested
-     * (somewhat imprecisely) in the libpng documentation, use that; otherwise
-     * use the default value we just calculated.  Either way, the user may
-     * override this via a command-line option. */
-
-    if ((p = getenv("SCREEN_GAMMA")) != NULL)
-        rpng2_info.display_exponent = atof(p);
-    else
-        rpng2_info.display_exponent = default_display_exponent;
-
-
-    /* Windows really hates command lines, so we have to set up our own argv.
-     * Note that we do NOT bother with quoted arguments here, so don't use
-     * filenames with spaces in 'em! */
-
-    argv[argc++] = PROGNAME;
-    p = cmd;
-    for (;;) {
-        if (*p == ' ')
-            while (*++p == ' ')
-                ;
-        /* now p points at the first non-space after some spaces */
-        if (*p == '\0')
-            break;    /* nothing after the spaces:  done */
-        argv[argc++] = q = p;
-        while (*q && *q != ' ')
-            ++q;
-        /* now q points at a space or the end of the string */
-        if (*q == '\0')
-            break;    /* last argv already terminated; quit */
-        *q = '\0';    /* change space to terminator */
-        p = q + 1;
-    }
-    argv[argc] = NULL;   /* terminate the argv array itself */
-
-
-    /* Now parse the command line for options and the PNG filename. */
-
-    while (*++argv && !error) {
-        if (!strcmp(*argv, "-gamma")) {
-            if (!*++argv)
-                ++error;
-            rpng2_info.display_exponent = atof(*argv);
-            if (rpng2_info.display_exponent <= 0.0)
-                ++error;
-        } else if (!strcmp(*argv, "-bgcolor")) {
-            if (!*++argv)
-                ++error;
-            bgstr = *argv;
-            if (strlen(bgstr) != 7 || bgstr[0] != '#')
-                ++error;
-            else {
-                have_bg = TRUE;
-                bg_image = FALSE;
-            }
-        } else if (!strcmp(*argv, "-bgpat")) {
-            if (!*++argv)
-                ++error;
-            pat = atoi(*argv) - 1;
-            if (pat < 0 || pat >= num_bgpat)
-                ++error;
-            else {
-                bg_image = TRUE;
-                have_bg = FALSE;
-            }
-        } else if (!strcmp(*argv, "-timing")) {
-            timing = TRUE;
-        } else {
-            if (**argv != '-') {
-                filename = *argv;
-                if (argv[1])   /* shouldn't be any more args after filename */
-                    ++error;
-            } else
-                ++error;   /* not expecting any other options */
-        }
-    }
-
-    if (!filename) {
-        ++error;
-    } else if (!(infile = fopen(filename, "rb"))) {
-        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
-        ++error;
-    } else {
-        incount = fread(inbuf, 1, INBUFSIZE, infile);
-        if (incount < 8 || !readpng2_check_sig(inbuf, 8)) {
-            fprintf(stderr, PROGNAME
-              ":  [%s] is not a PNG file: incorrect signature\n",
-              filename);
-            ++error;
-        } else if ((rc = readpng2_init(&rpng2_info)) != 0) {
-            switch (rc) {
-                case 2:
-                    fprintf(stderr, PROGNAME
-                      ":  [%s] has bad IHDR (libpng longjmp)\n",
-                      filename);
-                    break;
-                case 4:
-                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
-                    break;
-                default:
-                    fprintf(stderr, PROGNAME
-                      ":  unknown readpng2_init() error\n");
-                    break;
-            }
-            ++error;
-        }
-        if (error)
-            fclose(infile);
-    }
-
-    if (error) {
-        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
-        readpng2_version_info();
-        fprintf(stderr, "\n"
-          "Usage:  %s [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing]"
-          " file.png\n\n"
-          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
-          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
-          "\t\t  to the product of the lookup-table exponent (varies)\n"
-          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
-          "    bg  \tdesired background color in 7-character hex RGB format\n"
-          "\t\t  (e.g., ``#ff7f00'' for orange:  same as HTML colors);\n"
-          "\t\t  used with transparent images; overrides -bgpat\n"
-          "    pat \tdesired background pattern number (1-%d); used with\n"
-          "\t\t  transparent images; overrides -bgcolor\n"
-          "    -timing\tenables delay for every block read, to simulate modem\n"
-          "\t\t  download of image (~36 Kbps)\n"
-          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
-          "\n", PROGNAME, " ", default_display_exponent, num_bgpat);
-        exit(1);
-    }
-
-
-    /* set the title-bar string, but make sure buffer doesn't overflow */
-
-    alen = strlen(appname);
-    flen = strlen(filename);
-    if (alen + flen + 3 > 1023)
-        sprintf(titlebar, "%s:  ...%s", appname, filename+(alen+flen+6-1023));
-    else
-        sprintf(titlebar, "%s:  %s", appname, filename);
-
-
-    /* set some final rpng2_info variables before entering main data loop */
-
-    if (have_bg) {
-        unsigned r, g, b;   /* this approach quiets compiler warnings */
-
-        sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
-        rpng2_info.bg_red   = (uch)r;
-        rpng2_info.bg_green = (uch)g;
-        rpng2_info.bg_blue  = (uch)b;
-    } else
-        rpng2_info.need_bgcolor = TRUE;
-
-    rpng2_info.done = FALSE;
-    rpng2_info.mainprog_init = rpng2_win_init;
-    rpng2_info.mainprog_display_row = rpng2_win_display_row;
-    rpng2_info.mainprog_finish_display = rpng2_win_finish_display;
-
-
-    /* OK, this is the fun part:  call readpng2_decode_data() at the start of
-     * the loop to deal with our first buffer of data (read in above to verify
-     * that the file is a PNG image), then loop through the file and continue
-     * calling the same routine to handle each chunk of data.  It in turn
-     * passes the data to libpng, which will invoke one or more of our call-
-     * backs as decoded data become available.  We optionally call Sleep() for
-     * one second per iteration to simulate downloading the image via an analog
-     * modem. */
-
-    for (;;) {
-        Trace((stderr, "about to call readpng2_decode_data()\n"))
-        if (readpng2_decode_data(&rpng2_info, inbuf, incount))
-            ++error;
-        Trace((stderr, "done with readpng2_decode_data()\n"))
-        if (error || feof(infile) || rpng2_info.done)
-            break;
-        if (timing)
-            Sleep(1000L);
-        incount = fread(inbuf, 1, INBUFSIZE, infile);
-    }
-
-
-    /* clean up PNG stuff and report any decoding errors */
-
-    fclose(infile);
-    Trace((stderr, "about to call readpng2_cleanup()\n"))
-    readpng2_cleanup(&rpng2_info);
-
-    if (error) {
-        fprintf(stderr, PROGNAME ":  libpng error while decoding PNG image\n");
-        exit(3);
-    }
-
-
-    /* wait for the user to tell us when to quit */
-
-    while (GetMessage(&msg, NULL, 0, 0)) {
-        TranslateMessage(&msg);
-        DispatchMessage(&msg);
-    }
-
-
-    /* we're done:  clean up all image and Windows resources and go away */
-
-    Trace((stderr, "about to call rpng2_win_cleanup()\n"))
-    rpng2_win_cleanup();
-
-    return msg.wParam;
-}
-
-
-
-
-
-/* this function is called by readpng2_info_callback() in readpng2.c, which
- * in turn is called by libpng after all of the pre-IDAT chunks have been
- * read and processed--i.e., we now have enough info to finish initializing */
-
-static void rpng2_win_init()
-{
-    ulg i;
-    ulg rowbytes = rpng2_info.rowbytes;
-
-    Trace((stderr, "beginning rpng2_win_init()\n"))
-    Trace((stderr, "  rowbytes = %ld\n", rpng2_info.rowbytes))
-    Trace((stderr, "  width  = %ld\n", rpng2_info.width))
-    Trace((stderr, "  height = %ld\n", rpng2_info.height))
-
-    rpng2_info.image_data = (uch *)malloc(rowbytes * rpng2_info.height);
-    if (!rpng2_info.image_data) {
-        readpng2_cleanup(&rpng2_info);
-        return;
-    }
-
-    rpng2_info.row_pointers = (uch **)malloc(rpng2_info.height * sizeof(uch *));
-    if (!rpng2_info.row_pointers) {
-        free(rpng2_info.image_data);
-        rpng2_info.image_data = NULL;
-        readpng2_cleanup(&rpng2_info);
-        return;
-    }
-
-    for (i = 0;  i < rpng2_info.height;  ++i)
-        rpng2_info.row_pointers[i] = rpng2_info.image_data + i*rowbytes;
-
-/*---------------------------------------------------------------------------
-    Do the basic Windows initialization stuff, make the window, and fill it
-    with the user-specified, file-specified or default background color.
-  ---------------------------------------------------------------------------*/
-
-    if (rpng2_win_create_window()) {
-        readpng2_cleanup(&rpng2_info);
-        return;
-    }
-}
-
-
-
-
-
-static int rpng2_win_create_window()
-{
-    uch bg_red   = rpng2_info.bg_red;
-    uch bg_green = rpng2_info.bg_green;
-    uch bg_blue  = rpng2_info.bg_blue;
-    uch *dest;
-    int extra_width, extra_height;
-    ulg i, j;
-    WNDCLASSEX wndclass;
-    RECT rect;
-
-
-/*---------------------------------------------------------------------------
-    Allocate memory for the display-specific version of the image (round up
-    to multiple of 4 for Windows DIB).
-  ---------------------------------------------------------------------------*/
-
-    wimage_rowbytes = ((3*rpng2_info.width + 3L) >> 2) << 2;
-
-    if (!(dib = (uch *)malloc(sizeof(BITMAPINFOHEADER) +
-                              wimage_rowbytes*rpng2_info.height)))
-    {
-        return 4;	/* fail */
-    }
-
-/*---------------------------------------------------------------------------
-    Initialize the DIB.  Negative height means to use top-down BMP ordering
-    (must be uncompressed, but that's what we want).  Bit count of 1, 4 or 8
-    implies a colormap of RGBX quads, but 24-bit BMPs just use B,G,R values
-    directly => wimage_data begins immediately after BMP header.
-  ---------------------------------------------------------------------------*/
-
-    memset(dib, 0, sizeof(BITMAPINFOHEADER));
-    bmih = (BITMAPINFOHEADER *)dib;
-    bmih->biSize = sizeof(BITMAPINFOHEADER);
-    bmih->biWidth = rpng2_info.width;
-    bmih->biHeight = -((long)rpng2_info.height);
-    bmih->biPlanes = 1;
-    bmih->biBitCount = 24;
-    bmih->biCompression = 0;
-    wimage_data = dib + sizeof(BITMAPINFOHEADER);
-
-/*---------------------------------------------------------------------------
-    Fill window with the specified background color (default is black), but
-    defer loading faked "background image" until window is displayed (may be
-    slow to compute).  Data are in BGR order.
-  ---------------------------------------------------------------------------*/
-
-    if (bg_image) {   /* just fill with black for now */
-        memset(wimage_data, 0, wimage_rowbytes*rpng2_info.height);
-    } else {
-        for (j = 0;  j < rpng2_info.height;  ++j) {
-            dest = wimage_data + j*wimage_rowbytes;
-            for (i = rpng2_info.width;  i > 0;  --i) {
-                *dest++ = bg_blue;
-                *dest++ = bg_green;
-                *dest++ = bg_red;
-            }
-        }
-    }
-
-/*---------------------------------------------------------------------------
-    Set the window parameters.
-  ---------------------------------------------------------------------------*/
-
-    memset(&wndclass, 0, sizeof(wndclass));
-
-    wndclass.cbSize = sizeof(wndclass);
-    wndclass.style = CS_HREDRAW | CS_VREDRAW;
-    wndclass.lpfnWndProc = rpng2_win_wndproc;
-    wndclass.hInstance = global_hInst;
-    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
-    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
-    wndclass.hbrBackground = (HBRUSH)GetStockObject(DKGRAY_BRUSH);
-    wndclass.lpszMenuName = NULL;
-    wndclass.lpszClassName = progname;
-    wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
-
-    RegisterClassEx(&wndclass);
-
-/*---------------------------------------------------------------------------
-    Finally, create the window.
-  ---------------------------------------------------------------------------*/
-
-    extra_width  = 2*(GetSystemMetrics(SM_CXBORDER) +
-                      GetSystemMetrics(SM_CXDLGFRAME));
-    extra_height = 2*(GetSystemMetrics(SM_CYBORDER) +
-                      GetSystemMetrics(SM_CYDLGFRAME)) +
-                      GetSystemMetrics(SM_CYCAPTION);
-
-    global_hwnd = CreateWindow(progname, titlebar, WS_OVERLAPPEDWINDOW,
-      CW_USEDEFAULT, CW_USEDEFAULT, rpng2_info.width+extra_width,
-      rpng2_info.height+extra_height, NULL, NULL, global_hInst, NULL);
-
-    ShowWindow(global_hwnd, global_showmode);
-    UpdateWindow(global_hwnd);
-
-/*---------------------------------------------------------------------------
-    Now compute the background image and display it.  If it fails (memory
-    allocation), revert to a plain background color.
-  ---------------------------------------------------------------------------*/
-
-    if (bg_image) {
-        static const char *msg = "Computing background image...";
-        int x, y, len = strlen(msg);
-        HDC hdc = GetDC(global_hwnd);
-        TEXTMETRIC tm;
-
-        GetTextMetrics(hdc, &tm);
-        x = (rpng2_info.width - len*tm.tmAveCharWidth)/2;
-        y = (rpng2_info.height - tm.tmHeight)/2;
-        SetBkMode(hdc, TRANSPARENT);
-        SetTextColor(hdc, GetSysColor(COLOR_HIGHLIGHTTEXT));
-        /* this can still begin out of bounds even if x is positive (???): */
-        TextOut(hdc, ((x < 0)? 0 : x), ((y < 0)? 0 : y), msg, len);
-        ReleaseDC(global_hwnd, hdc);
-
-        rpng2_win_load_bg_image();	/* resets bg_image if fails */
-    }
-
-    if (!bg_image) {
-        for (j = 0;  j < rpng2_info.height;  ++j) {
-            dest = wimage_data + j*wimage_rowbytes;
-            for (i = rpng2_info.width;  i > 0;  --i) {
-                *dest++ = bg_blue;
-                *dest++ = bg_green;
-                *dest++ = bg_red;
-            }
-        }
-    }
-
-    rect.left = 0L;
-    rect.top = 0L;
-    rect.right = (LONG)rpng2_info.width;       /* possibly off by one? */
-    rect.bottom = (LONG)rpng2_info.height;     /* possibly off by one? */
-    InvalidateRect(global_hwnd, &rect, FALSE);
-    UpdateWindow(global_hwnd);                 /* similar to XFlush() */
-
-    return 0;
-
-} /* end function rpng2_win_create_window() */
-
-
-
-
-
-static int rpng2_win_load_bg_image()
-{
-    uch *src, *dest;
-    uch r1, r2, g1, g2, b1, b2;
-    uch r1_inv, r2_inv, g1_inv, g2_inv, b1_inv, b2_inv;
-    int k, hmax, max;
-    int xidx, yidx, yidx_max = (bgscale-1);
-    int even_odd_vert, even_odd_horiz, even_odd;
-    int invert_gradient2 = (bg[pat].type & 0x08);
-    int invert_column;
-    ulg i, row;
-
-/*---------------------------------------------------------------------------
-    Allocate buffer for fake background image to be used with transparent
-    images; if this fails, revert to plain background color.
-  ---------------------------------------------------------------------------*/
-
-    bg_rowbytes = 3 * rpng2_info.width;
-    bg_data = (uch *)malloc(bg_rowbytes * rpng2_info.height);
-    if (!bg_data) {
-        fprintf(stderr, PROGNAME
-          ":  unable to allocate memory for background image\n");
-        bg_image = 0;
-        return 1;
-    }
-
-/*---------------------------------------------------------------------------
-    Vertical gradients (ramps) in NxN squares, alternating direction and
-    colors (N == bgscale).
-  ---------------------------------------------------------------------------*/
-
-    if ((bg[pat].type & 0x07) == 0) {
-        uch r1_min  = rgb[bg[pat].rgb1_min].r;
-        uch g1_min  = rgb[bg[pat].rgb1_min].g;
-        uch b1_min  = rgb[bg[pat].rgb1_min].b;
-        uch r2_min  = rgb[bg[pat].rgb2_min].r;
-        uch g2_min  = rgb[bg[pat].rgb2_min].g;
-        uch b2_min  = rgb[bg[pat].rgb2_min].b;
-        int r1_diff = rgb[bg[pat].rgb1_max].r - r1_min;
-        int g1_diff = rgb[bg[pat].rgb1_max].g - g1_min;
-        int b1_diff = rgb[bg[pat].rgb1_max].b - b1_min;
-        int r2_diff = rgb[bg[pat].rgb2_max].r - r2_min;
-        int g2_diff = rgb[bg[pat].rgb2_max].g - g2_min;
-        int b2_diff = rgb[bg[pat].rgb2_max].b - b2_min;
-
-        for (row = 0;  row < rpng2_info.height;  ++row) {
-            yidx = row % bgscale;
-            even_odd_vert = (row / bgscale) & 1;
-
-            r1 = r1_min + (r1_diff * yidx) / yidx_max;
-            g1 = g1_min + (g1_diff * yidx) / yidx_max;
-            b1 = b1_min + (b1_diff * yidx) / yidx_max;
-            r1_inv = r1_min + (r1_diff * (yidx_max-yidx)) / yidx_max;
-            g1_inv = g1_min + (g1_diff * (yidx_max-yidx)) / yidx_max;
-            b1_inv = b1_min + (b1_diff * (yidx_max-yidx)) / yidx_max;
-
-            r2 = r2_min + (r2_diff * yidx) / yidx_max;
-            g2 = g2_min + (g2_diff * yidx) / yidx_max;
-            b2 = b2_min + (b2_diff * yidx) / yidx_max;
-            r2_inv = r2_min + (r2_diff * (yidx_max-yidx)) / yidx_max;
-            g2_inv = g2_min + (g2_diff * (yidx_max-yidx)) / yidx_max;
-            b2_inv = b2_min + (b2_diff * (yidx_max-yidx)) / yidx_max;
-
-            dest = bg_data + row*bg_rowbytes;
-            for (i = 0;  i < rpng2_info.width;  ++i) {
-                even_odd_horiz = (i / bgscale) & 1;
-                even_odd = even_odd_vert ^ even_odd_horiz;
-                invert_column =
-                  (even_odd_horiz && (bg[pat].type & 0x10));
-                if (even_odd == 0) {		/* gradient #1 */
-                    if (invert_column) {
-                        *dest++ = r1_inv;
-                        *dest++ = g1_inv;
-                        *dest++ = b1_inv;
-                    } else {
-                        *dest++ = r1;
-                        *dest++ = g1;
-                        *dest++ = b1;
-                    }
-                } else {			/* gradient #2 */
-                    if ((invert_column && invert_gradient2) ||
-                        (!invert_column && !invert_gradient2))
-                    {
-                        *dest++ = r2;      /* not inverted or */
-                        *dest++ = g2;      /*  doubly inverted */
-                        *dest++ = b2;
-                    } else {
-                        *dest++ = r2_inv;
-                        *dest++ = g2_inv;  /* singly inverted */
-                        *dest++ = b2_inv;
-                    }
-                }
-            }
-        }
-
-/*---------------------------------------------------------------------------
-    Soft gradient-diamonds with scale = bgscale.  Code contributed by Adam
-    M. Costello.
-  ---------------------------------------------------------------------------*/
-
-    } else if ((bg[pat].type & 0x07) == 1) {
-
-        hmax = (bgscale-1)/2;	/* half the max weight of a color */
-        max = 2*hmax;		/* the max weight of a color */
-
-        r1 = rgb[bg[pat].rgb1_max].r;
-        g1 = rgb[bg[pat].rgb1_max].g;
-        b1 = rgb[bg[pat].rgb1_max].b;
-        r2 = rgb[bg[pat].rgb2_max].r;
-        g2 = rgb[bg[pat].rgb2_max].g;
-        b2 = rgb[bg[pat].rgb2_max].b;
-
-        for (row = 0;  row < rpng2_info.height;  ++row) {
-            yidx = row % bgscale;
-            if (yidx > hmax)
-                yidx = bgscale-1 - yidx;
-            dest = bg_data + row*bg_rowbytes;
-            for (i = 0;  i < rpng2_info.width;  ++i) {
-                xidx = i % bgscale;
-                if (xidx > hmax)
-                    xidx = bgscale-1 - xidx;
-                k = xidx + yidx;
-                *dest++ = (k*r1 + (max-k)*r2) / max;
-                *dest++ = (k*g1 + (max-k)*g2) / max;
-                *dest++ = (k*b1 + (max-k)*b2) / max;
-            }
-        }
-
-/*---------------------------------------------------------------------------
-    Radial "starburst" with azimuthal sinusoids; [eventually number of sinu-
-    soids will equal bgscale?].  This one is slow but very cool.  Code con-
-    tributed by Pieter S. van der Meulen (originally in Smalltalk).
-  ---------------------------------------------------------------------------*/
-
-    } else if ((bg[pat].type & 0x07) == 2) {
-        uch ch;
-        int ii, x, y, hw, hh, grayspot;
-        double freq, rotate, saturate, gray, intensity;
-        double angle=0.0, aoffset=0.0, maxDist, dist;
-        double red=0.0, green=0.0, blue=0.0, hue, s, v, f, p, q, t;
-
-        fprintf(stderr, "%s:  computing radial background...",
-          PROGNAME);
-        fflush(stderr);
-
-        hh = rpng2_info.height / 2;
-        hw = rpng2_info.width / 2;
-
-        /* variables for radial waves:
-         *   aoffset:  number of degrees to rotate hue [CURRENTLY NOT USED]
-         *   freq:  number of color beams originating from the center
-         *   grayspot:  size of the graying center area (anti-alias)
-         *   rotate:  rotation of the beams as a function of radius
-         *   saturate:  saturation of beams' shape azimuthally
-         */
-        angle = CLIP(angle, 0.0, 360.0);
-        grayspot = CLIP(bg[pat].bg_gray, 1, (hh + hw));
-        freq = MAX((double)bg[pat].bg_freq, 0.0);
-        saturate = (double)bg[pat].bg_bsat * 0.1;
-        rotate = (double)bg[pat].bg_brot * 0.1;
-        gray = 0.0;
-        intensity = 0.0;
-        maxDist = (double)((hw*hw) + (hh*hh));
-
-        for (row = 0;  row < rpng2_info.height;  ++row) {
-            y = row - hh;
-            dest = bg_data + row*bg_rowbytes;
-            for (i = 0;  i < rpng2_info.width;  ++i) {
-                x = i - hw;
-                angle = (x == 0)? PI_2 : atan((double)y / (double)x);
-                gray = (double)MAX(ABS(y), ABS(x)) / grayspot;
-                gray = MIN(1.0, gray);
-                dist = (double)((x*x) + (y*y)) / maxDist;
-                intensity = cos((angle+(rotate*dist*PI)) * freq) *
-                  gray * saturate;
-                intensity = (MAX(MIN(intensity,1.0),-1.0) + 1.0) * 0.5;
-                hue = (angle + PI) * INV_PI_360 + aoffset;
-                s = gray * ((double)(ABS(x)+ABS(y)) / (double)(hw + hh));
-                s = MIN(MAX(s,0.0), 1.0);
-                v = MIN(MAX(intensity,0.0), 1.0);
-
-                if (s == 0.0) {
-                    ch = (uch)(v * 255.0);
-                    *dest++ = ch;
-                    *dest++ = ch;
-                    *dest++ = ch;
-                } else {
-                    if ((hue < 0.0) || (hue >= 360.0))
-                        hue -= (((int)(hue / 360.0)) * 360.0);
-                    hue /= 60.0;
-                    ii = (int)hue;
-                    f = hue - (double)ii;
-                    p = (1.0 - s) * v;
-                    q = (1.0 - (s * f)) * v;
-                    t = (1.0 - (s * (1.0 - f))) * v;
-                    if      (ii == 0) { red = v; green = t; blue = p; }
-                    else if (ii == 1) { red = q; green = v; blue = p; }
-                    else if (ii == 2) { red = p; green = v; blue = t; }
-                    else if (ii == 3) { red = p; green = q; blue = v; }
-                    else if (ii == 4) { red = t; green = p; blue = v; }
-                    else if (ii == 5) { red = v; green = p; blue = q; }
-                    *dest++ = (uch)(red * 255.0);
-                    *dest++ = (uch)(green * 255.0);
-                    *dest++ = (uch)(blue * 255.0);
-                }
-            }
-        }
-        fprintf(stderr, "done.\n");
-        fflush(stderr);
-    }
-
-/*---------------------------------------------------------------------------
-    Blast background image to display buffer before beginning PNG decode;
-    calling function will handle invalidation and UpdateWindow() call.
-  ---------------------------------------------------------------------------*/
-
-    for (row = 0;  row < rpng2_info.height;  ++row) {
-        src = bg_data + row*bg_rowbytes;
-        dest = wimage_data + row*wimage_rowbytes;
-        for (i = rpng2_info.width;  i > 0;  --i) {
-            r1 = *src++;
-            g1 = *src++;
-            b1 = *src++;
-            *dest++ = b1;
-            *dest++ = g1;	/* note reverse order */
-            *dest++ = r1;
-        }
-    }
-
-    return 0;
-
-} /* end function rpng2_win_load_bg_image() */
-
-
-
-
-
-static void rpng2_win_display_row(ulg row)
-{
-    uch bg_red   = rpng2_info.bg_red;
-    uch bg_green = rpng2_info.bg_green;
-    uch bg_blue  = rpng2_info.bg_blue;
-    uch *src, *src2=NULL, *dest;
-    uch r, g, b, a;
-    ulg i;
-    static int rows=0;
-    static ulg firstrow;
-
-/*---------------------------------------------------------------------------
-    rows and firstrow simply track how many rows (and which ones) have not
-    yet been displayed; alternatively, we could call InvalidateRect() for
-    every row and not bother with the records-keeping.
-  ---------------------------------------------------------------------------*/
-
-    Trace((stderr, "beginning rpng2_win_display_row()\n"))
-
-    if (rows == 0)
-        firstrow = row;   /* first row not yet displayed */
-
-    ++rows;   /* count of rows received but not yet displayed */
-
-/*---------------------------------------------------------------------------
-    Aside from the use of the rpng2_info struct and the lack of an outer
-    loop (over rows), this routine is identical to rpng_win_display_image()
-    in the non-progressive version of the program.
-  ---------------------------------------------------------------------------*/
-
-    src = rpng2_info.image_data + row*rpng2_info.rowbytes;
-    if (bg_image)
-        src2 = bg_data + row*bg_rowbytes;
-    dest = wimage_data + row*wimage_rowbytes;
-
-    if (rpng2_info.channels == 3) {
-        for (i = rpng2_info.width;  i > 0;  --i) {
-            r = *src++;
-            g = *src++;
-            b = *src++;
-            *dest++ = b;
-            *dest++ = g;	/* note reverse order */
-            *dest++ = r;
-        }
-    } else /* if (rpng2_info.channels == 4) */ {
-        for (i = rpng2_info.width;  i > 0;  --i) {
-            r = *src++;
-            g = *src++;
-            b = *src++;
-            a = *src++;
-            if (bg_image) {
-                bg_red   = *src2++;
-                bg_green = *src2++;
-                bg_blue  = *src2++;
-            }
-            if (a == 255) {
-                *dest++ = b;
-                *dest++ = g;
-                *dest++ = r;
-            } else if (a == 0) {
-                *dest++ = bg_blue;
-                *dest++ = bg_green;
-                *dest++ = bg_red;
-            } else {
-                /* this macro (copied from png.h) composites the
-                 * foreground and background values and puts the
-                 * result into the first argument; there are no
-                 * side effects with the first argument */
-                alpha_composite(*dest++, b, a, bg_blue);
-                alpha_composite(*dest++, g, a, bg_green);
-                alpha_composite(*dest++, r, a, bg_red);
-            }
-        }
-    }
-
-/*---------------------------------------------------------------------------
-    Display after every 16 rows or when on last row.  (Region may include
-    previously displayed lines due to interlacing--i.e., not contiguous.)
-  ---------------------------------------------------------------------------*/
-
-    if ((rows & 0xf) == 0 || row == rpng2_info.height-1) {
-        RECT rect;
-
-        rect.left = 0L;
-        rect.top = (LONG)firstrow;
-        rect.right = (LONG)rpng2_info.width;       /* possibly off by one? */
-        rect.bottom = (LONG)row + 1L;              /* possibly off by one? */
-        InvalidateRect(global_hwnd, &rect, FALSE);
-        UpdateWindow(global_hwnd);                 /* similar to XFlush() */
-        rows = 0;
-    }
-
-} /* end function rpng2_win_display_row() */
-
-
-
-
-
-static void rpng2_win_finish_display()
-{
-    Trace((stderr, "beginning rpng2_win_finish_display()\n"))
-
-    /* last row has already been displayed by rpng2_win_display_row(), so
-     * we have nothing to do here except set a flag and let the user know
-     * that the image is done */
-
-    rpng2_info.done = TRUE;
-    printf("Done.  Press Q, Esc or mouse button 1 to quit.\n");
-}
-
-
-
-
-
-static void rpng2_win_cleanup()
-{
-    if (bg_image && bg_data) {
-        free(bg_data);
-        bg_data = NULL;
-    }
-
-    if (rpng2_info.image_data) {
-        free(rpng2_info.image_data);
-        rpng2_info.image_data = NULL;
-    }
-
-    if (rpng2_info.row_pointers) {
-        free(rpng2_info.row_pointers);
-        rpng2_info.row_pointers = NULL;
-    }
-
-    if (dib) {
-        free(dib);
-        dib = NULL;
-    }
-}
-
-
-
-
-
-LRESULT CALLBACK rpng2_win_wndproc(HWND hwnd, UINT iMsg, WPARAM wP, LPARAM lP)
-{
-    HDC         hdc;
-    PAINTSTRUCT ps;
-    int rc;
-
-    switch (iMsg) {
-        case WM_CREATE:
-            /* one-time processing here, if any */
-            return 0;
-
-        case WM_PAINT:
-            hdc = BeginPaint(hwnd, &ps);
-            rc = StretchDIBits(hdc, 0, 0, rpng2_info.width, rpng2_info.height,
-                                    0, 0, rpng2_info.width, rpng2_info.height,
-                                    wimage_data, (BITMAPINFO *)bmih,
-                                    0, SRCCOPY);
-            EndPaint(hwnd, &ps);
-            return 0;
-
-        /* wait for the user to tell us when to quit */
-        case WM_CHAR:
-            switch (wP) {	/* only need one, so ignore repeat count */
-                case 'q':
-                case 'Q':
-                case 0x1B:	/* Esc key */
-                    PostQuitMessage(0);
-            }
-            return 0;
-
-        case WM_LBUTTONDOWN:	/* another way of quitting */
-        case WM_DESTROY:
-            PostQuitMessage(0);
-            return 0;
-    }
-
-    return DefWindowProc(hwnd, iMsg, wP, lP);
-}