1254 lines
44 KiB
C
1254 lines
44 KiB
C
/*---------------------------------------------------------------------------
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rpng2 - progressive-model PNG display program rpng2-win.c
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This program decodes and displays PNG files progressively, as if it were
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a web browser (though the front end is only set up to read from files).
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It supports gamma correction, user-specified background colors, and user-
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specified background patterns (for transparent images). This version is
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for 32-bit Windows; it may compile under 16-bit Windows with a little
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tweaking (or maybe not). Thanks to Adam Costello and Pieter S. van der
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Meulen for the "diamond" and "radial waves" patterns, respectively.
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to do (someday, maybe):
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- handle quoted command-line args (especially filenames with spaces)
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- finish resizable checkerboard-gradient (sizes 4-128?)
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- use %.1023s to simplify truncation of title-bar string?
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- have minimum window width: oh well
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---------------------------------------------------------------------------
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Changelog:
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- 1.01: initial public release
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- 1.02: fixed cut-and-paste error in usage screen (oops...)
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- 1.03: modified to allow abbreviated options
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- 1.04: removed bogus extra argument from usage fprintf() [Glenn R-P?];
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fixed command-line parsing bug
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- 1.10: enabled "message window"/console (thanks to David Geldreich)
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- 1.20: added runtime MMX-enabling/disabling and new -mmx* options
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- 1.21: made minor tweak to usage screen to fit within 25-line console
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- 1.22: added AMD64/EM64T support (__x86_64__)
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- 2.00: dual-licensed (added GNU GPL)
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- 2.01: fixed 64-bit typo in readpng2.c
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- 2.02: fixed improper display of usage screen on PNG error(s); fixed
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unexpected-EOF and file-read-error cases
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- 2.03: removed runtime MMX-enabling/disabling and obsolete -mmx* options
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---------------------------------------------------------------------------
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Copyright (c) 1998-2008 Greg Roelofs. All rights reserved.
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This software is provided "as is," without warranty of any kind,
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express or implied. In no event shall the author or contributors
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be held liable for any damages arising in any way from the use of
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this software.
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The contents of this file are DUAL-LICENSED. You may modify and/or
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redistribute this software according to the terms of one of the
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following two licenses (at your option):
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LICENSE 1 ("BSD-like with advertising clause"):
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute
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it freely, subject to the following restrictions:
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1. Redistributions of source code must retain the above copyright
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notice, disclaimer, and this list of conditions.
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2. Redistributions in binary form must reproduce the above copyright
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notice, disclaimer, and this list of conditions in the documenta-
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tion and/or other materials provided with the distribution.
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3. All advertising materials mentioning features or use of this
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software must display the following acknowledgment:
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This product includes software developed by Greg Roelofs
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and contributors for the book, "PNG: The Definitive Guide,"
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published by O'Reilly and Associates.
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LICENSE 2 (GNU GPL v2 or later):
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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---------------------------------------------------------------------------*/
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#define PROGNAME "rpng2-win"
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#define LONGNAME "Progressive PNG Viewer for Windows"
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#define VERSION "2.02 of 16 March 2008"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <setjmp.h> /* for jmpbuf declaration in readpng2.h */
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#include <time.h>
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#include <math.h> /* only for PvdM background code */
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#include <windows.h>
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#ifdef __CYGWIN__
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/* getch replacement. Turns out, we don't really need this,
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* but leave it here if we ever enable any of the uses of
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* _getch in the main code
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*/
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#include <unistd.h>
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#include <termio.h>
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#include <sys/ioctl.h>
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int repl_getch( void )
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{
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char ch;
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int fd = fileno(stdin);
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struct termio old_tty, new_tty;
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ioctl(fd, TCGETA, &old_tty);
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new_tty = old_tty;
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new_tty.c_lflag &= ~(ICANON | ECHO | ISIG);
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ioctl(fd, TCSETA, &new_tty);
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fread(&ch, 1, sizeof(ch), stdin);
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ioctl(fd, TCSETA, &old_tty);
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return ch;
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}
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#define _getch repl_getch
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#else
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#include <conio.h> /* only for _getch() */
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#endif
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/* all for PvdM background code: */
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#ifndef PI
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# define PI 3.141592653589793238
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#endif
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#define PI_2 (PI*0.5)
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#define INV_PI_360 (360.0 / PI)
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#define MAX(a,b) (a>b?a:b)
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#define MIN(a,b) (a<b?a:b)
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#define CLIP(a,min,max) MAX(min,MIN((a),max))
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#define ABS(a) ((a)<0?-(a):(a))
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#define CLIP8P(c) MAX(0,(MIN((c),255))) /* 8-bit pos. integer (uch) */
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#define ROUNDF(f) ((int)(f + 0.5))
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#define rgb1_max bg_freq
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#define rgb1_min bg_gray
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#define rgb2_max bg_bsat
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#define rgb2_min bg_brot
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/* #define DEBUG */ /* this enables the Trace() macros */
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#include "readpng2.h" /* typedefs, common macros, readpng2 prototypes */
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/* could just include png.h, but this macro is the only thing we need
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* (name and typedefs changed to local versions); note that side effects
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* only happen with alpha (which could easily be avoided with
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* "ush acopy = (alpha);") */
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#define alpha_composite(composite, fg, alpha, bg) { \
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ush temp = ((ush)(fg)*(ush)(alpha) + \
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(ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \
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(composite) = (uch)((temp + (temp >> 8)) >> 8); \
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}
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#define INBUFSIZE 4096 /* with pseudo-timing on (1 sec delay/block), this
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* block size corresponds roughly to a download
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* speed 10% faster than theoretical 33.6K maximum
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* (assuming 8 data bits, 1 stop bit and no other
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* overhead) */
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/* local prototypes */
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static void rpng2_win_init(void);
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static int rpng2_win_create_window(void);
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static int rpng2_win_load_bg_image(void);
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static void rpng2_win_display_row(ulg row);
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static void rpng2_win_finish_display(void);
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static void rpng2_win_cleanup(void);
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LRESULT CALLBACK rpng2_win_wndproc(HWND, UINT, WPARAM, LPARAM);
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static char titlebar[1024];
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static char *progname = PROGNAME;
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static char *appname = LONGNAME;
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static char *filename;
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static FILE *infile;
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static mainprog_info rpng2_info;
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static uch inbuf[INBUFSIZE];
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static int incount;
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static int pat = 6; /* must be less than num_bgpat */
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static int bg_image = 0;
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static int bgscale = 16;
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static ulg bg_rowbytes;
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static uch *bg_data;
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static struct rgb_color {
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uch r, g, b;
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} rgb[] = {
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{ 0, 0, 0}, /* 0: black */
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{255, 255, 255}, /* 1: white */
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{173, 132, 57}, /* 2: tan */
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{ 64, 132, 0}, /* 3: medium green */
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{189, 117, 1}, /* 4: gold */
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{253, 249, 1}, /* 5: yellow */
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{ 0, 0, 255}, /* 6: blue */
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{ 0, 0, 120}, /* 7: medium blue */
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{255, 0, 255}, /* 8: magenta */
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{ 64, 0, 64}, /* 9: dark magenta */
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{255, 0, 0}, /* 10: red */
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{ 64, 0, 0}, /* 11: dark red */
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{255, 127, 0}, /* 12: orange */
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{192, 96, 0}, /* 13: darker orange */
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{ 24, 60, 0}, /* 14: dark green-yellow */
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{ 85, 125, 200} /* 15: ice blue */
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};
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/* not used for now, but should be for error-checking:
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static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);
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*/
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/*
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This whole struct is a fairly cheesy way to keep the number of
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command-line options to a minimum. The radial-waves background
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type is a particularly poor fit to the integer elements of the
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struct...but a few macros and a little fixed-point math will do
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wonders for ya.
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type bits:
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F E D C B A 9 8 7 6 5 4 3 2 1 0
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| | | | |
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| | +-+-+-- 0 = sharp-edged checkerboard
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| | 1 = soft diamonds
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| | 2 = radial waves
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| | 3-7 = undefined
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| +-- gradient #2 inverted?
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+-- alternating columns inverted?
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*/
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static struct background_pattern {
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ush type;
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int rgb1_max, rgb1_min; /* or bg_freq, bg_gray */
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int rgb2_max, rgb2_min; /* or bg_bsat, bg_brot (both scaled by 10)*/
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} bg[] = {
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{0+8, 2,0, 1,15}, /* checkered: tan/black vs. white/ice blue */
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{0+24, 2,0, 1,0}, /* checkered: tan/black vs. white/black */
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{0+8, 4,5, 0,2}, /* checkered: gold/yellow vs. black/tan */
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{0+8, 4,5, 0,6}, /* checkered: gold/yellow vs. black/blue */
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{0, 7,0, 8,9}, /* checkered: deep blue/black vs. magenta */
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{0+8, 13,0, 5,14}, /* checkered: orange/black vs. yellow */
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{0+8, 12,0, 10,11}, /* checkered: orange/black vs. red */
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{1, 7,0, 8,0}, /* diamonds: deep blue/black vs. magenta */
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{1, 12,0, 11,0}, /* diamonds: orange vs. dark red */
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{1, 10,0, 7,0}, /* diamonds: red vs. medium blue */
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{1, 4,0, 5,0}, /* diamonds: gold vs. yellow */
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{1, 3,0, 0,0}, /* diamonds: medium green vs. black */
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{2, 16, 100, 20, 0}, /* radial: ~hard radial color-beams */
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{2, 18, 100, 10, 2}, /* radial: soft, curved radial color-beams */
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{2, 16, 256, 100, 250}, /* radial: very tight spiral */
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{2, 10000, 256, 11, 0} /* radial: dipole-moire' (almost fractal) */
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};
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static int num_bgpat = sizeof(bg) / sizeof(struct background_pattern);
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/* Windows-specific global variables (could go in struct, but messy...) */
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static ulg wimage_rowbytes;
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static uch *dib;
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static uch *wimage_data;
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static BITMAPINFOHEADER *bmih;
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static HWND global_hwnd;
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static HINSTANCE global_hInst;
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static int global_showmode;
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int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
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{
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char *args[1024]; /* arbitrary limit, but should suffice */
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char **argv = args;
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char *p, *q, *bgstr = NULL;
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int argc = 0;
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int rc, alen, flen;
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int error = 0;
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int timing = FALSE;
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int have_bg = FALSE;
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double LUT_exponent; /* just the lookup table */
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double CRT_exponent = 2.2; /* just the monitor */
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double default_display_exponent; /* whole display system */
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MSG msg;
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/* First initialize a few things, just to be sure--memset takes care of
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* default background color (black), booleans (FALSE), pointers (NULL),
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* etc. */
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global_hInst = hInst;
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global_showmode = showmode;
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filename = (char *)NULL;
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memset(&rpng2_info, 0, sizeof(mainprog_info));
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#ifndef __CYGWIN__
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/* Next reenable console output, which normally goes to the bit bucket
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* for windowed apps. Closing the console window will terminate the
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* app. Thanks to David.Geldreich@realviz.com for supplying the magical
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* incantation. */
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AllocConsole();
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freopen("CONOUT$", "a", stderr);
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freopen("CONOUT$", "a", stdout);
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#endif
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/* Set the default value for our display-system exponent, i.e., the
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* product of the CRT exponent and the exponent corresponding to
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* the frame-buffer's lookup table (LUT), if any. This is not an
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* exhaustive list of LUT values (e.g., OpenStep has a lot of weird
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* ones), but it should cover 99% of the current possibilities. And
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* yes, these ifdefs are completely wasted in a Windows program... */
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#if defined(NeXT)
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/* third-party utilities can modify the default LUT exponent */
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LUT_exponent = 1.0 / 2.2;
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/*
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if (some_next_function_that_returns_gamma(&next_gamma))
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LUT_exponent = 1.0 / next_gamma;
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*/
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#elif defined(sgi)
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LUT_exponent = 1.0 / 1.7;
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/* there doesn't seem to be any documented function to
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* get the "gamma" value, so we do it the hard way */
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infile = fopen("/etc/config/system.glGammaVal", "r");
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if (infile) {
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double sgi_gamma;
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fgets(tmpline, 80, infile);
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fclose(infile);
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sgi_gamma = atof(tmpline);
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if (sgi_gamma > 0.0)
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LUT_exponent = 1.0 / sgi_gamma;
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}
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#elif defined(Macintosh)
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LUT_exponent = 1.8 / 2.61;
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/*
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if (some_mac_function_that_returns_gamma(&mac_gamma))
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LUT_exponent = mac_gamma / 2.61;
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*/
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#else
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LUT_exponent = 1.0; /* assume no LUT: most PCs */
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#endif
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/* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */
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default_display_exponent = LUT_exponent * CRT_exponent;
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/* If the user has set the SCREEN_GAMMA environment variable as suggested
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* (somewhat imprecisely) in the libpng documentation, use that; otherwise
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* use the default value we just calculated. Either way, the user may
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* override this via a command-line option. */
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if ((p = getenv("SCREEN_GAMMA")) != NULL)
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rpng2_info.display_exponent = atof(p);
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else
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rpng2_info.display_exponent = default_display_exponent;
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/* Windows really hates command lines, so we have to set up our own argv.
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* Note that we do NOT bother with quoted arguments here, so don't use
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* filenames with spaces in 'em! */
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argv[argc++] = PROGNAME;
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p = cmd;
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for (;;) {
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if (*p == ' ')
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while (*++p == ' ')
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;
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/* now p points at the first non-space after some spaces */
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if (*p == '\0')
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break; /* nothing after the spaces: done */
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argv[argc++] = q = p;
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while (*q && *q != ' ')
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++q;
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/* now q points at a space or the end of the string */
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if (*q == '\0')
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break; /* last argv already terminated; quit */
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*q = '\0'; /* change space to terminator */
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p = q + 1;
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}
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argv[argc] = NULL; /* terminate the argv array itself */
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/* Now parse the command line for options and the PNG filename. */
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while (*++argv && !error) {
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if (!strncmp(*argv, "-gamma", 2)) {
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if (!*++argv)
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++error;
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else {
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rpng2_info.display_exponent = atof(*argv);
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if (rpng2_info.display_exponent <= 0.0)
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++error;
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}
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} else if (!strncmp(*argv, "-bgcolor", 4)) {
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if (!*++argv)
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++error;
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else {
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bgstr = *argv;
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if (strlen(bgstr) != 7 || bgstr[0] != '#')
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++error;
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else {
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have_bg = TRUE;
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bg_image = FALSE;
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}
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}
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} else if (!strncmp(*argv, "-bgpat", 4)) {
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if (!*++argv)
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++error;
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else {
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pat = atoi(*argv) - 1;
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if (pat < 0 || pat >= num_bgpat)
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++error;
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else {
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bg_image = TRUE;
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have_bg = FALSE;
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}
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}
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} else if (!strncmp(*argv, "-timing", 2)) {
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timing = TRUE;
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} else {
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if (**argv != '-') {
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filename = *argv;
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if (argv[1]) /* shouldn't be any more args after filename */
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++error;
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} else
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++error; /* not expecting any other options */
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}
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}
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if (!filename)
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++error;
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/* print usage screen if any errors up to this point */
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if (error) {
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#ifndef __CYGWIN__
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int ch;
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#endif
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fprintf(stderr, "\n%s %s: %s\n\n", PROGNAME, VERSION, appname);
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readpng2_version_info();
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fprintf(stderr, "\n"
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"Usage: %s [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing]\n"
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" %*s file.png\n\n"
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" exp \ttransfer-function exponent (``gamma'') of the display\n"
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"\t\t system in floating-point format (e.g., ``%.1f''); equal\n"
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"\t\t to the product of the lookup-table exponent (varies)\n"
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"\t\t and the CRT exponent (usually 2.2); must be positive\n"
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" bg \tdesired background color in 7-character hex RGB format\n"
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"\t\t (e.g., ``#ff7700'' for orange: same as HTML colors);\n"
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"\t\t used with transparent images; overrides -bgpat option\n"
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" pat \tdesired background pattern number (1-%d); used with\n"
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"\t\t transparent images; overrides -bgcolor option\n"
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" -timing\tenables delay for every block read, to simulate modem\n"
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"\t\t download of image (~36 Kbps)\n"
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"\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
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#ifndef __CYGWIN__
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"Press Q or Esc to quit this usage screen. ",
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#else
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,
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#endif
|
|
PROGNAME,
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#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__)) && \
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!(defined(__CYGWIN__) || defined(__MINGW32__))
|
|
(int)strlen(PROGNAME), " ",
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|
#endif
|
|
(int)strlen(PROGNAME), " ", default_display_exponent, num_bgpat);
|
|
fflush(stderr);
|
|
#ifndef __CYGWIN__
|
|
do
|
|
ch = _getch();
|
|
while (ch != 'q' && ch != 'Q' && ch != 0x1B);
|
|
#endif
|
|
exit(1);
|
|
}
|
|
|
|
|
|
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) {
|
|
#ifndef __CYGWIN__
|
|
int ch;
|
|
#endif
|
|
|
|
fprintf(stderr, PROGNAME ": aborting.\n");
|
|
#ifndef __CYGWIN__
|
|
do
|
|
ch = _getch();
|
|
while (ch != 'q' && ch != 'Q' && ch != 0x1B);
|
|
#endif
|
|
exit(2);
|
|
} else {
|
|
fprintf(stderr, "\n%s %s: %s\n", PROGNAME, VERSION, appname);
|
|
#ifndef __CYGWIN__
|
|
fprintf(stderr,
|
|
"\n [console window: closing this window will terminate %s]\n\n",
|
|
PROGNAME);
|
|
#endif
|
|
fflush(stderr);
|
|
}
|
|
|
|
|
|
/* 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.state = kPreInit;
|
|
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 || incount != INBUFSIZE || rpng2_info.state == kDone) {
|
|
if (rpng2_info.state == kDone) {
|
|
Trace((stderr, "done decoding PNG image\n"))
|
|
} else if (ferror(infile)) {
|
|
fprintf(stderr, PROGNAME
|
|
": error while reading PNG image file\n");
|
|
exit(3);
|
|
} else if (feof(infile)) {
|
|
fprintf(stderr, PROGNAME ": end of file reached "
|
|
"(unexpectedly) while reading PNG image file\n");
|
|
exit(3);
|
|
} else /* if (error) */ {
|
|
/* will print error message below */
|
|
}
|
|
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 = %d\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;
|
|
}
|
|
|
|
rpng2_info.state = kWindowInit;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
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.state = kDone;
|
|
printf(
|
|
#ifndef __CYGWIN__
|
|
"Done. Press Q, Esc or mouse button 1 (within image window) to quit.\n"
|
|
#else
|
|
"Done. Press mouse button 1 (within image window) to quit.\n"
|
|
#endif
|
|
);
|
|
fflush(stdout);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
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);
|
|
}
|