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911 lines
30 KiB
911 lines
30 KiB
/*--------------------------------------------------------------------------- |
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rpng - simple PNG display program rpng-x.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 the X Window System (tested by author under Unix and |
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by Martin Zinser under OpenVMS; may work under OS/2 with some tweaking). |
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to do: |
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- 8-bit (colormapped) X support |
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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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- 1.01: initial public release |
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- 1.02: modified to allow abbreviated options; fixed long/ulong mis- |
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match; switched to png_jmpbuf() macro |
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- 1.10: added support for non-default visuals; fixed X pixel-conversion |
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- 1.11: added extra set of parentheses to png_jmpbuf() macro; fixed |
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command-line parsing bug |
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- 1.12: fixed some small X memory leaks (thanks to François Petitjean) |
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- 1.13: fixed XFreeGC() crash bug (thanks to Patrick Welche) |
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- 1.14: added support for X resources (thanks to Gerhard Niklasch) |
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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: Added "void(argc);" statement to quiet pedantic compiler warnings |
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about unused variable (GR-P) |
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- 2.03: 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-x" |
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#define LONGNAME "Simple PNG Viewer for X" |
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#define VERSION "2.02 of 15 June 2014" |
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#define RESNAME "rpng" /* our X resource application name */ |
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#define RESCLASS "Rpng" /* our X resource class name */ |
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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 <X11/Xlib.h> |
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#include <X11/Xutil.h> |
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#include <X11/Xos.h> |
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#include <X11/keysym.h> |
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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_x_create_window(void); |
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static int rpng_x_display_image(void); |
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static void rpng_x_cleanup(void); |
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static int rpng_x_msb(ulg u32val); |
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static char titlebar[1024], *window_name = titlebar; |
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static char *appname = LONGNAME; |
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static char *icon_name = PROGNAME; |
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static char *res_name = RESNAME; |
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static char *res_class = RESCLASS; |
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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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/* X-specific variables */ |
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static char *displayname; |
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static XImage *ximage; |
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static Display *display; |
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static int depth; |
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static Visual *visual; |
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static XVisualInfo *visual_list; |
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static int RShift, GShift, BShift; |
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static ulg RMask, GMask, BMask; |
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static Window window; |
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static GC gc; |
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static Colormap colormap; |
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static int have_nondefault_visual = FALSE; |
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static int have_colormap = FALSE; |
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static int have_window = FALSE; |
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static int have_gc = FALSE; |
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/* |
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ulg numcolors=0, pixels[256]; |
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ush reds[256], greens[256], blues[256]; |
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*/ |
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int main(int argc, char **argv) |
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{ |
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#ifdef sgi |
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char tmpline[80]; |
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#endif |
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char *p; |
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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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XEvent e; |
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KeySym k; |
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displayname = (char *)NULL; |
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filename = (char *)NULL; |
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/* First 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. */ |
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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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/* 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, "-display", 2)) { |
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if (!*++argv) |
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++error; |
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else |
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displayname = *argv; |
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} else 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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fprintf(stderr, "\n%s %s: %s\n", PROGNAME, VERSION, appname); |
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readpng_version_info(); |
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fprintf(stderr, "\n" |
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"Usage: %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n" |
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" xdpy\tname of the target X display (e.g., ``hostname:0'')\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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PROGNAME, default_display_exponent); |
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fprintf(stderr, "\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 (within image window, after image\n" |
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"is displayed) to quit.\n"); |
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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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} else { |
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display = XOpenDisplay(displayname); |
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if (!display) { |
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readpng_cleanup(TRUE); |
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fprintf(stderr, PROGNAME ": can't open X display [%s]\n", |
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displayname? displayname : "default"); |
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++error; |
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} |
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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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fprintf(stderr, PROGNAME ": aborting.\n"); |
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exit(2); |
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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 X initialization stuff, make the window and fill it |
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* with the background color */ |
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if (rpng_x_create_window()) |
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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_x_display_image()\n")) |
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if (rpng_x_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_x_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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"Done. Press Q, Esc or mouse button 1 (within image window) to quit.\n"); |
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fflush(stdout); |
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do |
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XNextEvent(display, &e); |
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while (!(e.type == ButtonPress && e.xbutton.button == Button1) && |
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!(e.type == KeyPress && /* v--- or 1 for shifted keys */ |
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((k = XLookupKeysym(&e.xkey, 0)) == XK_q || k == XK_Escape) )); |
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/* OK, we're done: clean up all image and X resources and go away */ |
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rpng_x_cleanup(); |
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(void)argc; /* Unused */ |
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return 0; |
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} |
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static int rpng_x_create_window(void) |
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{ |
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uch *xdata; |
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int need_colormap = FALSE; |
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int screen, pad; |
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ulg bg_pixel = 0L; |
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ulg attrmask; |
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Window root; |
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XEvent e; |
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XGCValues gcvalues; |
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XSetWindowAttributes attr; |
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XTextProperty windowName, *pWindowName = &windowName; |
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XTextProperty iconName, *pIconName = &iconName; |
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XVisualInfo visual_info; |
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XSizeHints *size_hints; |
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XWMHints *wm_hints; |
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XClassHint *class_hints; |
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screen = DefaultScreen(display); |
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depth = DisplayPlanes(display, screen); |
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root = RootWindow(display, screen); |
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#ifdef DEBUG |
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XSynchronize(display, True); |
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#endif |
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#if 0 |
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/* GRR: add 8-bit support */ |
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if (/* depth != 8 && */ depth != 16 && depth != 24 && depth != 32) { |
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fprintf(stderr, |
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"screen depth %d not supported (only 16-, 24- or 32-bit TrueColor)\n", |
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depth); |
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return 2; |
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} |
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XMatchVisualInfo(display, screen, depth, |
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(depth == 8)? PseudoColor : TrueColor, &visual_info); |
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visual = visual_info.visual; |
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#else |
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if (depth != 16 && depth != 24 && depth != 32) { |
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int visuals_matched = 0; |
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Trace((stderr, "default depth is %d: checking other visuals\n", |
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depth)) |
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/* 24-bit first */ |
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visual_info.screen = screen; |
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visual_info.depth = 24; |
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visual_list = XGetVisualInfo(display, |
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VisualScreenMask | VisualDepthMask, &visual_info, &visuals_matched); |
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if (visuals_matched == 0) { |
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/* GRR: add 15-, 16- and 32-bit TrueColor visuals (also DirectColor?) */ |
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fprintf(stderr, "default screen depth %d not supported, and no" |
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" 24-bit visuals found\n", depth); |
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return 2; |
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} |
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Trace((stderr, "XGetVisualInfo() returned %d 24-bit visuals\n", |
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visuals_matched)) |
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visual = visual_list[0].visual; |
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depth = visual_list[0].depth; |
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/* |
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colormap_size = visual_list[0].colormap_size; |
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visual_class = visual->class; |
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visualID = XVisualIDFromVisual(visual); |
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*/ |
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have_nondefault_visual = TRUE; |
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need_colormap = TRUE; |
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} else { |
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XMatchVisualInfo(display, screen, depth, TrueColor, &visual_info); |
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visual = visual_info.visual; |
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} |
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#endif |
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RMask = visual->red_mask; |
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GMask = visual->green_mask; |
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BMask = visual->blue_mask; |
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/* GRR: add/check 8-bit support */ |
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if (depth == 8 || need_colormap) { |
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colormap = XCreateColormap(display, root, visual, AllocNone); |
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if (!colormap) { |
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fprintf(stderr, "XCreateColormap() failed\n"); |
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return 2; |
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} |
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have_colormap = TRUE; |
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} |
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if (depth == 15 || depth == 16) { |
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RShift = 15 - rpng_x_msb(RMask); /* these are right-shifts */ |
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GShift = 15 - rpng_x_msb(GMask); |
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BShift = 15 - rpng_x_msb(BMask); |
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} else if (depth > 16) { |
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#define NO_24BIT_MASKS |
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#ifdef NO_24BIT_MASKS |
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RShift = rpng_x_msb(RMask) - 7; /* these are left-shifts */ |
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GShift = rpng_x_msb(GMask) - 7; |
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BShift = rpng_x_msb(BMask) - 7; |
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#else |
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RShift = 7 - rpng_x_msb(RMask); /* these are right-shifts, too */ |
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GShift = 7 - rpng_x_msb(GMask); |
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BShift = 7 - rpng_x_msb(BMask); |
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#endif |
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} |
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if (depth >= 15 && (RShift < 0 || GShift < 0 || BShift < 0)) { |
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fprintf(stderr, "rpng internal logic error: negative X shift(s)!\n"); |
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return 2; |
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} |
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/*--------------------------------------------------------------------------- |
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Finally, create the window. |
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---------------------------------------------------------------------------*/ |
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attr.backing_store = Always; |
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attr.event_mask = ExposureMask | KeyPressMask | ButtonPressMask; |
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attrmask = CWBackingStore | CWEventMask; |
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if (have_nondefault_visual) { |
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attr.colormap = colormap; |
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attr.background_pixel = 0; |
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attr.border_pixel = 1; |
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attrmask |= CWColormap | CWBackPixel | CWBorderPixel; |
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} |
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window = XCreateWindow(display, root, 0, 0, image_width, image_height, 0, |
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depth, InputOutput, visual, attrmask, &attr); |
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if (window == None) { |
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fprintf(stderr, "XCreateWindow() failed\n"); |
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return 2; |
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} else |
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have_window = TRUE; |
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if (depth == 8) |
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XSetWindowColormap(display, window, colormap); |
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if (!XStringListToTextProperty(&window_name, 1, pWindowName)) |
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pWindowName = NULL; |
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if (!XStringListToTextProperty(&icon_name, 1, pIconName)) |
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pIconName = NULL; |
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|
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/* OK if any hints allocation fails; XSetWMProperties() allows NULLs */ |
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|
|
if ((size_hints = XAllocSizeHints()) != NULL) { |
|
/* window will not be resizable */ |
|
size_hints->flags = PMinSize | PMaxSize; |
|
size_hints->min_width = size_hints->max_width = (int)image_width; |
|
size_hints->min_height = size_hints->max_height = (int)image_height; |
|
} |
|
|
|
if ((wm_hints = XAllocWMHints()) != NULL) { |
|
wm_hints->initial_state = NormalState; |
|
wm_hints->input = True; |
|
/* wm_hints->icon_pixmap = icon_pixmap; */ |
|
wm_hints->flags = StateHint | InputHint /* | IconPixmapHint */ ; |
|
} |
|
|
|
if ((class_hints = XAllocClassHint()) != NULL) { |
|
class_hints->res_name = res_name; |
|
class_hints->res_class = res_class; |
|
} |
|
|
|
XSetWMProperties(display, window, pWindowName, pIconName, NULL, 0, |
|
size_hints, wm_hints, class_hints); |
|
|
|
/* various properties and hints no longer needed; free memory */ |
|
if (pWindowName) |
|
XFree(pWindowName->value); |
|
if (pIconName) |
|
XFree(pIconName->value); |
|
if (size_hints) |
|
XFree(size_hints); |
|
if (wm_hints) |
|
XFree(wm_hints); |
|
if (class_hints) |
|
XFree(class_hints); |
|
|
|
XMapWindow(display, window); |
|
|
|
gc = XCreateGC(display, window, 0, &gcvalues); |
|
have_gc = TRUE; |
|
|
|
/*--------------------------------------------------------------------------- |
|
Fill window with the specified background color. |
|
---------------------------------------------------------------------------*/ |
|
|
|
if (depth == 24 || depth == 32) { |
|
bg_pixel = ((ulg)bg_red << RShift) | |
|
((ulg)bg_green << GShift) | |
|
((ulg)bg_blue << BShift); |
|
} else if (depth == 16) { |
|
bg_pixel = ((((ulg)bg_red << 8) >> RShift) & RMask) | |
|
((((ulg)bg_green << 8) >> GShift) & GMask) | |
|
((((ulg)bg_blue << 8) >> BShift) & BMask); |
|
} else /* depth == 8 */ { |
|
|
|
/* GRR: add 8-bit support */ |
|
|
|
} |
|
|
|
XSetForeground(display, gc, bg_pixel); |
|
XFillRectangle(display, window, gc, 0, 0, image_width, image_height); |
|
|
|
/*--------------------------------------------------------------------------- |
|
Wait for first Expose event to do any drawing, then flush. |
|
---------------------------------------------------------------------------*/ |
|
|
|
do |
|
XNextEvent(display, &e); |
|
while (e.type != Expose || e.xexpose.count); |
|
|
|
XFlush(display); |
|
|
|
/*--------------------------------------------------------------------------- |
|
Allocate memory for the X- and display-specific version of the image. |
|
---------------------------------------------------------------------------*/ |
|
|
|
if (depth == 24 || depth == 32) { |
|
xdata = (uch *)malloc(4*image_width*image_height); |
|
pad = 32; |
|
} else if (depth == 16) { |
|
xdata = (uch *)malloc(2*image_width*image_height); |
|
pad = 16; |
|
} else /* depth == 8 */ { |
|
xdata = (uch *)malloc(image_width*image_height); |
|
pad = 8; |
|
} |
|
|
|
if (!xdata) { |
|
fprintf(stderr, PROGNAME ": unable to allocate image memory\n"); |
|
return 4; |
|
} |
|
|
|
ximage = XCreateImage(display, visual, depth, ZPixmap, 0, |
|
(char *)xdata, image_width, image_height, pad, 0); |
|
|
|
if (!ximage) { |
|
fprintf(stderr, PROGNAME ": XCreateImage() failed\n"); |
|
free(xdata); |
|
return 3; |
|
} |
|
|
|
/* to avoid testing the byte order every pixel (or doubling the size of |
|
* the drawing routine with a giant if-test), we arbitrarily set the byte |
|
* order to MSBFirst and let Xlib worry about inverting things on little- |
|
* endian machines (like Linux/x86, old VAXen, etc.)--this is not the most |
|
* efficient approach (the giant if-test would be better), but in the |
|
* interest of clarity, we take the easy way out... */ |
|
|
|
ximage->byte_order = MSBFirst; |
|
|
|
return 0; |
|
|
|
} /* end function rpng_x_create_window() */ |
|
|
|
|
|
|
|
|
|
|
|
static int rpng_x_display_image(void) |
|
{ |
|
uch *src; |
|
char *dest; |
|
uch r, g, b, a; |
|
ulg i, row, lastrow = 0; |
|
ulg pixel; |
|
int ximage_rowbytes = ximage->bytes_per_line; |
|
/* int bpp = ximage->bits_per_pixel; */ |
|
|
|
|
|
Trace((stderr, "beginning display loop (image_channels == %d)\n", |
|
image_channels)) |
|
Trace((stderr, " (width = %ld, rowbytes = %ld, ximage_rowbytes = %d)\n", |
|
image_width, image_rowbytes, ximage_rowbytes)) |
|
Trace((stderr, " (bpp = %d)\n", ximage->bits_per_pixel)) |
|
Trace((stderr, " (byte_order = %s)\n", ximage->byte_order == MSBFirst? |
|
"MSBFirst" : (ximage->byte_order == LSBFirst? "LSBFirst" : "unknown"))) |
|
|
|
if (depth == 24 || depth == 32) { |
|
ulg red, green, blue; |
|
|
|
for (lastrow = row = 0; row < image_height; ++row) { |
|
src = image_data + row*image_rowbytes; |
|
dest = ximage->data + row*ximage_rowbytes; |
|
if (image_channels == 3) { |
|
for (i = image_width; i > 0; --i) { |
|
red = *src++; |
|
green = *src++; |
|
blue = *src++; |
|
#ifdef NO_24BIT_MASKS |
|
pixel = (red << RShift) | |
|
(green << GShift) | |
|
(blue << BShift); |
|
/* recall that we set ximage->byte_order = MSBFirst above */ |
|
/* GRR BUG: this assumes bpp == 32, but may be 24: */ |
|
*dest++ = (char)((pixel >> 24) & 0xff); |
|
*dest++ = (char)((pixel >> 16) & 0xff); |
|
*dest++ = (char)((pixel >> 8) & 0xff); |
|
*dest++ = (char)( pixel & 0xff); |
|
#else |
|
red = (RShift < 0)? red << (-RShift) : red >> RShift; |
|
green = (GShift < 0)? green << (-GShift) : green >> GShift; |
|
blue = (BShift < 0)? blue << (-BShift) : blue >> BShift; |
|
pixel = (red & RMask) | (green & GMask) | (blue & BMask); |
|
/* recall that we set ximage->byte_order = MSBFirst above */ |
|
*dest++ = (char)((pixel >> 24) & 0xff); |
|
*dest++ = (char)((pixel >> 16) & 0xff); |
|
*dest++ = (char)((pixel >> 8) & 0xff); |
|
*dest++ = (char)( pixel & 0xff); |
|
#endif |
|
} |
|
} else /* if (image_channels == 4) */ { |
|
for (i = image_width; i > 0; --i) { |
|
r = *src++; |
|
g = *src++; |
|
b = *src++; |
|
a = *src++; |
|
if (a == 255) { |
|
red = r; |
|
green = g; |
|
blue = b; |
|
} else if (a == 0) { |
|
red = bg_red; |
|
green = bg_green; |
|
blue = bg_blue; |
|
} else { |
|
/* this macro (from png.h) composites the foreground |
|
* and background values and puts the result into the |
|
* first argument */ |
|
alpha_composite(red, r, a, bg_red); |
|
alpha_composite(green, g, a, bg_green); |
|
alpha_composite(blue, b, a, bg_blue); |
|
} |
|
pixel = (red << RShift) | |
|
(green << GShift) | |
|
(blue << BShift); |
|
/* recall that we set ximage->byte_order = MSBFirst above */ |
|
*dest++ = (char)((pixel >> 24) & 0xff); |
|
*dest++ = (char)((pixel >> 16) & 0xff); |
|
*dest++ = (char)((pixel >> 8) & 0xff); |
|
*dest++ = (char)( pixel & 0xff); |
|
} |
|
} |
|
/* display after every 16 lines */ |
|
if (((row+1) & 0xf) == 0) { |
|
XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0, |
|
(int)lastrow, image_width, 16); |
|
XFlush(display); |
|
lastrow = row + 1; |
|
} |
|
} |
|
|
|
} else if (depth == 16) { |
|
ush red, green, blue; |
|
|
|
for (lastrow = row = 0; row < image_height; ++row) { |
|
src = image_data + row*image_rowbytes; |
|
dest = ximage->data + row*ximage_rowbytes; |
|
if (image_channels == 3) { |
|
for (i = image_width; i > 0; --i) { |
|
red = ((ush)(*src) << 8); |
|
++src; |
|
green = ((ush)(*src) << 8); |
|
++src; |
|
blue = ((ush)(*src) << 8); |
|
++src; |
|
pixel = ((red >> RShift) & RMask) | |
|
((green >> GShift) & GMask) | |
|
((blue >> BShift) & BMask); |
|
/* recall that we set ximage->byte_order = MSBFirst above */ |
|
*dest++ = (char)((pixel >> 8) & 0xff); |
|
*dest++ = (char)( pixel & 0xff); |
|
} |
|
} else /* if (image_channels == 4) */ { |
|
for (i = image_width; i > 0; --i) { |
|
r = *src++; |
|
g = *src++; |
|
b = *src++; |
|
a = *src++; |
|
if (a == 255) { |
|
red = ((ush)r << 8); |
|
green = ((ush)g << 8); |
|
blue = ((ush)b << 8); |
|
} else if (a == 0) { |
|
red = ((ush)bg_red << 8); |
|
green = ((ush)bg_green << 8); |
|
blue = ((ush)bg_blue << 8); |
|
} else { |
|
/* this macro (from png.h) composites the foreground |
|
* and background values and puts the result back into |
|
* the first argument (== fg byte here: safe) */ |
|
alpha_composite(r, r, a, bg_red); |
|
alpha_composite(g, g, a, bg_green); |
|
alpha_composite(b, b, a, bg_blue); |
|
red = ((ush)r << 8); |
|
green = ((ush)g << 8); |
|
blue = ((ush)b << 8); |
|
} |
|
pixel = ((red >> RShift) & RMask) | |
|
((green >> GShift) & GMask) | |
|
((blue >> BShift) & BMask); |
|
/* recall that we set ximage->byte_order = MSBFirst above */ |
|
*dest++ = (char)((pixel >> 8) & 0xff); |
|
*dest++ = (char)( pixel & 0xff); |
|
} |
|
} |
|
/* display after every 16 lines */ |
|
if (((row+1) & 0xf) == 0) { |
|
XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0, |
|
(int)lastrow, image_width, 16); |
|
XFlush(display); |
|
lastrow = row + 1; |
|
} |
|
} |
|
|
|
} else /* depth == 8 */ { |
|
|
|
/* GRR: add 8-bit support */ |
|
|
|
} |
|
|
|
Trace((stderr, "calling final XPutImage()\n")) |
|
if (lastrow < image_height) { |
|
XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0, |
|
(int)lastrow, image_width, image_height-lastrow); |
|
XFlush(display); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
|
|
|
|
|
|
static void rpng_x_cleanup(void) |
|
{ |
|
if (image_data) { |
|
free(image_data); |
|
image_data = NULL; |
|
} |
|
|
|
if (ximage) { |
|
if (ximage->data) { |
|
free(ximage->data); /* we allocated it, so we free it */ |
|
ximage->data = (char *)NULL; /* instead of XDestroyImage() */ |
|
} |
|
XDestroyImage(ximage); |
|
ximage = NULL; |
|
} |
|
|
|
if (have_gc) |
|
XFreeGC(display, gc); |
|
|
|
if (have_window) |
|
XDestroyWindow(display, window); |
|
|
|
if (have_colormap) |
|
XFreeColormap(display, colormap); |
|
|
|
if (have_nondefault_visual) |
|
XFree(visual_list); |
|
} |
|
|
|
|
|
|
|
|
|
|
|
static int rpng_x_msb(ulg u32val) |
|
{ |
|
int i; |
|
|
|
for (i = 31; i >= 0; --i) { |
|
if (u32val & 0x80000000L) |
|
break; |
|
u32val <<= 1; |
|
} |
|
return i; |
|
}
|
|
|