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735 lines
24 KiB
735 lines
24 KiB
/*--------------------------------------------------------------------------- |
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rpng - simple PNG display program rpng-win.c |
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This program decodes and displays PNG images, with gamma correction and |
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optionally with a user-specified background color (in case the image has |
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transparency). It is very nearly the most basic PNG viewer possible. |
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This version is for 32-bit Windows; it may compile under 16-bit Windows |
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with a little tweaking (or maybe not). |
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to do: |
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- handle quoted command-line args (especially filenames with spaces) |
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- have minimum window width: oh well |
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- use %.1023s to simplify truncation of title-bar string? |
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--------------------------------------------------------------------------- |
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Changelog: |
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- 1.00: initial public release |
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- 1.01: modified to allow abbreviated options; fixed long/ulong mis- |
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match; switched to png_jmpbuf() macro |
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- 1.02: added extra set of parentheses to png_jmpbuf() macro; fixed |
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command-line parsing bug |
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- 1.10: enabled "message window"/console (thanks to David Geldreich) |
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- 2.00: dual-licensed (added GNU GPL) |
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- 2.01: fixed improper display of usage screen on PNG error(s) |
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- 2.02: check for integer overflow (Glenn R-P) |
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--------------------------------------------------------------------------- |
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Copyright (c) 1998-2008, 2017 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 "rpng-win" |
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#define LONGNAME "Simple PNG Viewer for Windows" |
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#define VERSION "2.01 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 <time.h> |
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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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/* #define DEBUG : this enables the Trace() macros */ |
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#include "readpng.h" /* typedefs, common macros, readpng 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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/* local prototypes */ |
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static int rpng_win_create_window(HINSTANCE hInst, int showmode); |
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static int rpng_win_display_image(void); |
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static void rpng_win_cleanup(void); |
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LRESULT CALLBACK rpng_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 char *bgstr; |
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static uch bg_red=0, bg_green=0, bg_blue=0; |
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static double display_exponent; |
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static ulg image_width, image_height, image_rowbytes; |
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static int image_channels; |
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static uch *image_data; |
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/* Windows-specific variables */ |
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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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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 *p, *q, **argv = args; |
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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 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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filename = (char *)NULL; |
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#ifndef __CYGWIN__ |
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/* First 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 at 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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/* Next set the default value for our display-system exponent, i.e., |
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* the 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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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 get the |
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* "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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display_exponent = atof(p); |
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else |
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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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display_exponent = atof(*argv); |
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if (display_exponent <= 0.0) |
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++error; |
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} |
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} else if (!strncmp(*argv, "-bgcolor", 2)) { |
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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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} |
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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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readpng_version_info(); |
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fprintf(stderr, "\n" |
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"Usage: %s [-gamma exp] [-bgcolor bg] file.png\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\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.\n" |
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#endif |
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"\n", PROGNAME, default_display_exponent); |
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#ifndef __CYGWIN__ |
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do |
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ch = _getch(); |
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while (ch != 'q' && ch != 'Q' && ch != 0x1B); |
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#endif |
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exit(1); |
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} |
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if (!(infile = fopen(filename, "rb"))) { |
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fprintf(stderr, PROGNAME ": can't open PNG file [%s]\n", filename); |
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++error; |
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} else { |
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if ((rc = readpng_init(infile, &image_width, &image_height)) != 0) { |
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switch (rc) { |
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case 1: |
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fprintf(stderr, PROGNAME |
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": [%s] is not a PNG file: incorrect signature\n", |
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filename); |
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break; |
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case 2: |
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fprintf(stderr, PROGNAME |
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": [%s] has bad IHDR (libpng longjmp)\n", filename); |
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break; |
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case 4: |
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fprintf(stderr, PROGNAME ": insufficient memory\n"); |
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break; |
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default: |
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fprintf(stderr, PROGNAME |
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": unknown readpng_init() error\n"); |
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break; |
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} |
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++error; |
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} |
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if (error) |
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fclose(infile); |
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} |
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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, PROGNAME ": aborting.\n"); |
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#ifndef __CYGWIN__ |
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do |
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ch = _getch(); |
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while (ch != 'q' && ch != 'Q' && ch != 0x1B); |
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#endif |
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exit(2); |
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} else { |
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fprintf(stderr, "\n%s %s: %s\n", PROGNAME, VERSION, appname); |
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#ifndef __CYGWIN__ |
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fprintf(stderr, |
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"\n [console window: closing this window will terminate %s]\n\n", |
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PROGNAME); |
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#endif |
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} |
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/* set the title-bar string, but make sure buffer doesn't overflow */ |
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alen = strlen(appname); |
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flen = strlen(filename); |
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if (alen + flen + 3 > 1023) |
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sprintf(titlebar, "%s: ...%s", appname, filename+(alen+flen+6-1023)); |
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else |
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sprintf(titlebar, "%s: %s", appname, filename); |
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/* if the user didn't specify a background color on the command line, |
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* check for one in the PNG file--if not, the initialized values of 0 |
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* (black) will be used */ |
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if (have_bg) { |
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unsigned r, g, b; /* this approach quiets compiler warnings */ |
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sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b); |
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bg_red = (uch)r; |
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bg_green = (uch)g; |
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bg_blue = (uch)b; |
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} else if (readpng_get_bgcolor(&bg_red, &bg_green, &bg_blue) > 1) { |
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readpng_cleanup(TRUE); |
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fprintf(stderr, PROGNAME |
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": libpng error while checking for background color\n"); |
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exit(2); |
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} |
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/* do the basic Windows initialization stuff, make the window and fill it |
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* with the background color */ |
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if (rpng_win_create_window(hInst, showmode)) |
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exit(2); |
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/* decode the image, all at once */ |
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Trace((stderr, "calling readpng_get_image()\n")) |
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image_data = readpng_get_image(display_exponent, &image_channels, |
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&image_rowbytes); |
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Trace((stderr, "done with readpng_get_image()\n")) |
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/* done with PNG file, so clean up to minimize memory usage (but do NOT |
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* nuke image_data!) */ |
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readpng_cleanup(FALSE); |
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fclose(infile); |
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if (!image_data) { |
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fprintf(stderr, PROGNAME ": unable to decode PNG image\n"); |
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exit(3); |
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} |
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/* display image (composite with background if requested) */ |
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Trace((stderr, "calling rpng_win_display_image()\n")) |
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if (rpng_win_display_image()) { |
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free(image_data); |
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exit(4); |
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} |
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Trace((stderr, "done with rpng_win_display_image()\n")) |
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/* wait for the user to tell us when to quit */ |
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printf( |
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#ifndef __CYGWIN__ |
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"Done. Press Q, Esc or mouse button 1 (within image window) to quit.\n" |
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#else |
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"Done. Press mouse button 1 (within image window) to quit.\n" |
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#endif |
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); |
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fflush(stdout); |
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while (GetMessage(&msg, NULL, 0, 0)) { |
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TranslateMessage(&msg); |
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DispatchMessage(&msg); |
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} |
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/* OK, we're done: clean up all image and Windows resources and go away */ |
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rpng_win_cleanup(); |
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return msg.wParam; |
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} |
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static int rpng_win_create_window(HINSTANCE hInst, int showmode) |
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{ |
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uch *dest; |
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int extra_width, extra_height; |
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ulg i, j; |
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WNDCLASSEX wndclass; |
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/*--------------------------------------------------------------------------- |
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Allocate memory for the display-specific version of the image (round up |
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to multiple of 4 for Windows DIB). |
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---------------------------------------------------------------------------*/ |
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wimage_rowbytes = ((3*image_width + 3L) >> 2) << 2; |
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/* Guard against integer overflow */ |
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if (image_height > ((size_t)(-1))/wimage_rowbytes) { |
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fprintf(stderr, PROGNAME ": image_data buffer would be too large\n"); |
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return 4; /* fail */ |
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} |
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if (!(dib = (uch *)malloc(sizeof(BITMAPINFOHEADER) + |
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wimage_rowbytes*image_height))) |
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{ |
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return 4; /* fail */ |
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} |
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/*--------------------------------------------------------------------------- |
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Initialize the DIB. Negative height means to use top-down BMP ordering |
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(must be uncompressed, but that's what we want). Bit count of 1, 4 or 8 |
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implies a colormap of RGBX quads, but 24-bit BMPs just use B,G,R values |
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directly => wimage_data begins immediately after BMP header. |
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---------------------------------------------------------------------------*/ |
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memset(dib, 0, sizeof(BITMAPINFOHEADER)); |
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bmih = (BITMAPINFOHEADER *)dib; |
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bmih->biSize = sizeof(BITMAPINFOHEADER); |
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bmih->biWidth = image_width; |
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bmih->biHeight = -((long)image_height); |
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bmih->biPlanes = 1; |
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bmih->biBitCount = 24; |
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bmih->biCompression = 0; |
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wimage_data = dib + sizeof(BITMAPINFOHEADER); |
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/*--------------------------------------------------------------------------- |
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Fill in background color (black by default); data are in BGR order. |
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---------------------------------------------------------------------------*/ |
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for (j = 0; j < image_height; ++j) { |
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dest = wimage_data + j*wimage_rowbytes; |
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for (i = image_width; i > 0; --i) { |
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*dest++ = bg_blue; |
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*dest++ = bg_green; |
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*dest++ = bg_red; |
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} |
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} |
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/*--------------------------------------------------------------------------- |
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Set the window parameters. |
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---------------------------------------------------------------------------*/ |
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memset(&wndclass, 0, sizeof(wndclass)); |
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wndclass.cbSize = sizeof(wndclass); |
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wndclass.style = CS_HREDRAW | CS_VREDRAW; |
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wndclass.lpfnWndProc = rpng_win_wndproc; |
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wndclass.hInstance = hInst; |
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wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION); |
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wndclass.hCursor = LoadCursor(NULL, IDC_ARROW); |
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wndclass.hbrBackground = (HBRUSH)GetStockObject(DKGRAY_BRUSH); |
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wndclass.lpszMenuName = NULL; |
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wndclass.lpszClassName = progname; |
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wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION); |
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RegisterClassEx(&wndclass); |
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/*--------------------------------------------------------------------------- |
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Finally, create the window. |
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---------------------------------------------------------------------------*/ |
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extra_width = 2*(GetSystemMetrics(SM_CXBORDER) + |
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GetSystemMetrics(SM_CXDLGFRAME)); |
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extra_height = 2*(GetSystemMetrics(SM_CYBORDER) + |
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GetSystemMetrics(SM_CYDLGFRAME)) + |
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GetSystemMetrics(SM_CYCAPTION); |
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global_hwnd = CreateWindow(progname, titlebar, WS_OVERLAPPEDWINDOW, |
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CW_USEDEFAULT, CW_USEDEFAULT, image_width+extra_width, |
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image_height+extra_height, NULL, NULL, hInst, NULL); |
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ShowWindow(global_hwnd, showmode); |
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UpdateWindow(global_hwnd); |
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return 0; |
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} /* end function rpng_win_create_window() */ |
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static int rpng_win_display_image() |
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{ |
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uch *src, *dest; |
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uch r, g, b, a; |
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ulg i, row, lastrow; |
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RECT rect; |
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Trace((stderr, "beginning display loop (image_channels == %d)\n", |
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image_channels)) |
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Trace((stderr, "(width = %ld, rowbytes = %ld, wimage_rowbytes = %d)\n", |
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image_width, image_rowbytes, wimage_rowbytes)) |
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/*--------------------------------------------------------------------------- |
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Blast image data to buffer. This whole routine takes place before the |
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message loop begins, so there's no real point in any pseudo-progressive |
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display... |
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---------------------------------------------------------------------------*/ |
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for (lastrow = row = 0; row < image_height; ++row) { |
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src = image_data + row*image_rowbytes; |
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dest = wimage_data + row*wimage_rowbytes; |
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if (image_channels == 3) { |
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for (i = image_width; i > 0; --i) { |
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r = *src++; |
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g = *src++; |
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b = *src++; |
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*dest++ = b; |
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*dest++ = g; /* note reverse order */ |
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*dest++ = r; |
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} |
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} else /* if (image_channels == 4) */ { |
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for (i = image_width; i > 0; --i) { |
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r = *src++; |
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g = *src++; |
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b = *src++; |
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a = *src++; |
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if (a == 255) { |
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*dest++ = b; |
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*dest++ = g; |
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*dest++ = r; |
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} else if (a == 0) { |
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*dest++ = bg_blue; |
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*dest++ = bg_green; |
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*dest++ = bg_red; |
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} else { |
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/* this macro (copied from png.h) composites the |
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* foreground and background values and puts the |
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* result into the first argument; there are no |
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* side effects with the first argument */ |
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alpha_composite(*dest++, b, a, bg_blue); |
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alpha_composite(*dest++, g, a, bg_green); |
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alpha_composite(*dest++, r, a, bg_red); |
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} |
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} |
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} |
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/* display after every 16 lines */ |
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if (((row+1) & 0xf) == 0) { |
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rect.left = 0L; |
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rect.top = (LONG)lastrow; |
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rect.right = (LONG)image_width; /* possibly off by one? */ |
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rect.bottom = (LONG)lastrow + 16L; /* possibly off by one? */ |
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InvalidateRect(global_hwnd, &rect, FALSE); |
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UpdateWindow(global_hwnd); /* similar to XFlush() */ |
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lastrow = row + 1; |
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} |
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} |
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Trace((stderr, "calling final image-flush routine\n")) |
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if (lastrow < image_height) { |
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rect.left = 0L; |
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rect.top = (LONG)lastrow; |
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rect.right = (LONG)image_width; /* possibly off by one? */ |
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rect.bottom = (LONG)image_height; /* possibly off by one? */ |
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InvalidateRect(global_hwnd, &rect, FALSE); |
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UpdateWindow(global_hwnd); /* similar to XFlush() */ |
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} |
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/* |
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last param determines whether or not background is wiped before paint |
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InvalidateRect(global_hwnd, NULL, TRUE); |
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UpdateWindow(global_hwnd); |
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*/ |
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return 0; |
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} |
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static void rpng_win_cleanup() |
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{ |
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if (image_data) { |
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free(image_data); |
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image_data = NULL; |
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} |
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if (dib) { |
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free(dib); |
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dib = NULL; |
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} |
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} |
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LRESULT CALLBACK rpng_win_wndproc(HWND hwnd, UINT iMsg, WPARAM wP, LPARAM lP) |
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{ |
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HDC hdc; |
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PAINTSTRUCT ps; |
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int rc; |
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switch (iMsg) { |
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case WM_CREATE: |
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/* one-time processing here, if any */ |
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return 0; |
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case WM_PAINT: |
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hdc = BeginPaint(hwnd, &ps); |
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/* dest */ |
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rc = StretchDIBits(hdc, 0, 0, image_width, image_height, |
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/* source */ |
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0, 0, image_width, image_height, |
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wimage_data, (BITMAPINFO *)bmih, |
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/* iUsage: no clue */ |
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0, SRCCOPY); |
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EndPaint(hwnd, &ps); |
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return 0; |
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/* wait for the user to tell us when to quit */ |
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case WM_CHAR: |
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switch (wP) { /* only need one, so ignore repeat count */ |
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case 'q': |
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case 'Q': |
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case 0x1B: /* Esc key */ |
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PostQuitMessage(0); |
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} |
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return 0; |
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case WM_LBUTTONDOWN: /* another way of quitting */ |
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case WM_DESTROY: |
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PostQuitMessage(0); |
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return 0; |
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} |
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return DefWindowProc(hwnd, iMsg, wP, lP); |
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}
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