| /*--------------------------------------------------------------------------- |
| |
| rpng - simple PNG display program rpng-x.c |
| |
| This program decodes and displays PNG images, with gamma correction and |
| optionally with a user-specified background color (in case the image has |
| transparency). It is very nearly the most basic PNG viewer possible. |
| This version is for the X Window System (tested by author under Unix and |
| by Martin Zinser under OpenVMS; may work under OS/2 with some tweaking). |
| |
| to do: |
| - 8-bit (colormapped) X support |
| - use %.1023s to simplify truncation of title-bar string? |
| |
| --------------------------------------------------------------------------- |
| |
| Changelog: |
| - 1.01: initial public release |
| - 1.02: modified to allow abbreviated options; fixed long/ulong mis- |
| match; switched to png_jmpbuf() macro |
| - 1.10: added support for non-default visuals; fixed X pixel-conversion |
| - 1.11: added extra set of parentheses to png_jmpbuf() macro; fixed |
| command-line parsing bug |
| - 1.12: fixed some small X memory leaks (thanks to François Petitjean) |
| - 1.13: fixed XFreeGC() crash bug (thanks to Patrick Welche) |
| - 1.14: added support for X resources (thanks to Gerhard Niklasch) |
| - 2.00: dual-licensed (added GNU GPL) |
| - 2.01: fixed improper display of usage screen on PNG error(s) |
| - 2.02: Added "void(argc);" statement to quiet pedantic compiler warnings |
| about unused variable (GR-P) |
| - 2.03: check for integer overflow (Glenn R-P) |
| |
| --------------------------------------------------------------------------- |
| |
| Copyright (c) 1998-2008, 2017 Greg Roelofs. All rights reserved. |
| |
| This software is provided "as is," without warranty of any kind, |
| express or implied. In no event shall the author or contributors |
| be held liable for any damages arising in any way from the use of |
| this software. |
| |
| The contents of this file are DUAL-LICENSED. You may modify and/or |
| redistribute this software according to the terms of one of the |
| following two licenses (at your option): |
| |
| |
| LICENSE 1 ("BSD-like with advertising clause"): |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute |
| it freely, subject to the following restrictions: |
| |
| 1. Redistributions of source code must retain the above copyright |
| notice, disclaimer, and this list of conditions. |
| 2. Redistributions in binary form must reproduce the above copyright |
| notice, disclaimer, and this list of conditions in the documenta- |
| tion and/or other materials provided with the distribution. |
| 3. All advertising materials mentioning features or use of this |
| software must display the following acknowledgment: |
| |
| This product includes software developed by Greg Roelofs |
| and contributors for the book, "PNG: The Definitive Guide," |
| published by O'Reilly and Associates. |
| |
| |
| LICENSE 2 (GNU GPL v2 or later): |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software Foundation, |
| Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| |
| ---------------------------------------------------------------------------*/ |
| |
| #define PROGNAME "rpng-x" |
| #define LONGNAME "Simple PNG Viewer for X" |
| #define VERSION "2.02 of 15 June 2014" |
| #define RESNAME "rpng" /* our X resource application name */ |
| #define RESCLASS "Rpng" /* our X resource class name */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <time.h> |
| #include <X11/Xlib.h> |
| #include <X11/Xutil.h> |
| #include <X11/Xos.h> |
| #include <X11/keysym.h> |
| |
| /* #define DEBUG : this enables the Trace() macros */ |
| |
| #include "readpng.h" /* typedefs, common macros, readpng prototypes */ |
| |
| |
| /* could just include png.h, but this macro is the only thing we need |
| * (name and typedefs changed to local versions); note that side effects |
| * only happen with alpha (which could easily be avoided with |
| * "ush acopy = (alpha);") */ |
| |
| #define alpha_composite(composite, fg, alpha, bg) { \ |
| ush temp = ((ush)(fg)*(ush)(alpha) + \ |
| (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \ |
| (composite) = (uch)((temp + (temp >> 8)) >> 8); \ |
| } |
| |
| |
| /* local prototypes */ |
| static int rpng_x_create_window(void); |
| static int rpng_x_display_image(void); |
| static void rpng_x_cleanup(void); |
| static int rpng_x_msb(ulg u32val); |
| |
| |
| static char titlebar[1024], *window_name = titlebar; |
| static char *appname = LONGNAME; |
| static char *icon_name = PROGNAME; |
| static char *res_name = RESNAME; |
| static char *res_class = RESCLASS; |
| static char *filename; |
| static FILE *infile; |
| |
| static char *bgstr; |
| static uch bg_red=0, bg_green=0, bg_blue=0; |
| |
| static double display_exponent; |
| |
| static ulg image_width, image_height, image_rowbytes; |
| static int image_channels; |
| static uch *image_data; |
| |
| /* X-specific variables */ |
| static char *displayname; |
| static XImage *ximage; |
| static Display *display; |
| static int depth; |
| static Visual *visual; |
| static XVisualInfo *visual_list; |
| static int RShift, GShift, BShift; |
| static ulg RMask, GMask, BMask; |
| static Window window; |
| static GC gc; |
| static Colormap colormap; |
| |
| static int have_nondefault_visual = FALSE; |
| static int have_colormap = FALSE; |
| static int have_window = FALSE; |
| static int have_gc = FALSE; |
| /* |
| ulg numcolors=0, pixels[256]; |
| ush reds[256], greens[256], blues[256]; |
| */ |
| |
| |
| |
| |
| int main(int argc, char **argv) |
| { |
| #ifdef sgi |
| char tmpline[80]; |
| #endif |
| char *p; |
| int rc, alen, flen; |
| int error = 0; |
| int have_bg = FALSE; |
| double LUT_exponent; /* just the lookup table */ |
| double CRT_exponent = 2.2; /* just the monitor */ |
| double default_display_exponent; /* whole display system */ |
| XEvent e; |
| KeySym k; |
| |
| |
| displayname = (char *)NULL; |
| filename = (char *)NULL; |
| |
| |
| /* First set the default value for our display-system exponent, i.e., |
| * the product of the CRT exponent and the exponent corresponding to |
| * the frame-buffer's lookup table (LUT), if any. This is not an |
| * exhaustive list of LUT values (e.g., OpenStep has a lot of weird |
| * ones), but it should cover 99% of the current possibilities. */ |
| |
| #if defined(NeXT) |
| LUT_exponent = 1.0 / 2.2; |
| /* |
| if (some_next_function_that_returns_gamma(&next_gamma)) |
| LUT_exponent = 1.0 / next_gamma; |
| */ |
| #elif defined(sgi) |
| LUT_exponent = 1.0 / 1.7; |
| /* there doesn't seem to be any documented function to get the |
| * "gamma" value, so we do it the hard way */ |
| infile = fopen("/etc/config/system.glGammaVal", "r"); |
| if (infile) { |
| double sgi_gamma; |
| |
| fgets(tmpline, 80, infile); |
| fclose(infile); |
| sgi_gamma = atof(tmpline); |
| if (sgi_gamma > 0.0) |
| LUT_exponent = 1.0 / sgi_gamma; |
| } |
| #elif defined(Macintosh) |
| LUT_exponent = 1.8 / 2.61; |
| /* |
| if (some_mac_function_that_returns_gamma(&mac_gamma)) |
| LUT_exponent = mac_gamma / 2.61; |
| */ |
| #else |
| LUT_exponent = 1.0; /* assume no LUT: most PCs */ |
| #endif |
| |
| /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */ |
| default_display_exponent = LUT_exponent * CRT_exponent; |
| |
| |
| /* If the user has set the SCREEN_GAMMA environment variable as suggested |
| * (somewhat imprecisely) in the libpng documentation, use that; otherwise |
| * use the default value we just calculated. Either way, the user may |
| * override this via a command-line option. */ |
| |
| if ((p = getenv("SCREEN_GAMMA")) != NULL) |
| display_exponent = atof(p); |
| else |
| display_exponent = default_display_exponent; |
| |
| |
| /* Now parse the command line for options and the PNG filename. */ |
| |
| while (*++argv && !error) { |
| if (!strncmp(*argv, "-display", 2)) { |
| if (!*++argv) |
| ++error; |
| else |
| displayname = *argv; |
| } else if (!strncmp(*argv, "-gamma", 2)) { |
| if (!*++argv) |
| ++error; |
| else { |
| display_exponent = atof(*argv); |
| if (display_exponent <= 0.0) |
| ++error; |
| } |
| } else if (!strncmp(*argv, "-bgcolor", 2)) { |
| if (!*++argv) |
| ++error; |
| else { |
| bgstr = *argv; |
| if (strlen(bgstr) != 7 || bgstr[0] != '#') |
| ++error; |
| else |
| have_bg = TRUE; |
| } |
| } else { |
| if (**argv != '-') { |
| filename = *argv; |
| if (argv[1]) /* shouldn't be any more args after filename */ |
| ++error; |
| } else |
| ++error; /* not expecting any other options */ |
| } |
| } |
| |
| if (!filename) |
| ++error; |
| |
| |
| /* print usage screen if any errors up to this point */ |
| |
| if (error) { |
| fprintf(stderr, "\n%s %s: %s\n", PROGNAME, VERSION, appname); |
| readpng_version_info(); |
| fprintf(stderr, "\n" |
| "Usage: %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n" |
| " xdpy\tname of the target X display (e.g., ``hostname:0'')\n" |
| " exp \ttransfer-function exponent (``gamma'') of the display\n" |
| "\t\t system in floating-point format (e.g., ``%.1f''); equal\n", |
| PROGNAME, default_display_exponent); |
| |
| fprintf(stderr, "\n" |
| "\t\t to the product of the lookup-table exponent (varies)\n" |
| "\t\t and the CRT exponent (usually 2.2); must be positive\n" |
| " bg \tdesired background color in 7-character hex RGB format\n" |
| "\t\t (e.g., ``#ff7700'' for orange: same as HTML colors);\n" |
| "\t\t used with transparent images\n" |
| "\nPress Q, Esc or mouse button 1 (within image window, after image\n" |
| "is displayed) to quit.\n"); |
| exit(1); |
| } |
| |
| |
| if (!(infile = fopen(filename, "rb"))) { |
| fprintf(stderr, PROGNAME ": can't open PNG file [%s]\n", filename); |
| ++error; |
| } else { |
| if ((rc = readpng_init(infile, &image_width, &image_height)) != 0) { |
| switch (rc) { |
| case 1: |
| fprintf(stderr, PROGNAME |
| ": [%s] is not a PNG file: incorrect signature\n", |
| filename); |
| break; |
| case 2: |
| fprintf(stderr, PROGNAME |
| ": [%s] has bad IHDR (libpng longjmp)\n", filename); |
| break; |
| case 4: |
| fprintf(stderr, PROGNAME ": insufficient memory\n"); |
| break; |
| default: |
| fprintf(stderr, PROGNAME |
| ": unknown readpng_init() error\n"); |
| break; |
| } |
| ++error; |
| } else { |
| display = XOpenDisplay(displayname); |
| if (!display) { |
| readpng_cleanup(TRUE); |
| fprintf(stderr, PROGNAME ": can't open X display [%s]\n", |
| displayname? displayname : "default"); |
| ++error; |
| } |
| } |
| if (error) |
| fclose(infile); |
| } |
| |
| |
| if (error) { |
| fprintf(stderr, PROGNAME ": aborting.\n"); |
| exit(2); |
| } |
| |
| |
| /* set the title-bar string, but make sure buffer doesn't overflow */ |
| |
| alen = strlen(appname); |
| flen = strlen(filename); |
| if (alen + flen + 3 > 1023) |
| sprintf(titlebar, "%s: ...%s", appname, filename+(alen+flen+6-1023)); |
| else |
| sprintf(titlebar, "%s: %s", appname, filename); |
| |
| |
| /* if the user didn't specify a background color on the command line, |
| * check for one in the PNG file--if not, the initialized values of 0 |
| * (black) will be used */ |
| |
| if (have_bg) { |
| unsigned r, g, b; /* this approach quiets compiler warnings */ |
| |
| sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b); |
| bg_red = (uch)r; |
| bg_green = (uch)g; |
| bg_blue = (uch)b; |
| } else if (readpng_get_bgcolor(&bg_red, &bg_green, &bg_blue) > 1) { |
| readpng_cleanup(TRUE); |
| fprintf(stderr, PROGNAME |
| ": libpng error while checking for background color\n"); |
| exit(2); |
| } |
| |
| |
| /* do the basic X initialization stuff, make the window and fill it |
| * with the background color */ |
| |
| if (rpng_x_create_window()) |
| exit(2); |
| |
| |
| /* decode the image, all at once */ |
| |
| Trace((stderr, "calling readpng_get_image()\n")) |
| image_data = readpng_get_image(display_exponent, &image_channels, |
| &image_rowbytes); |
| Trace((stderr, "done with readpng_get_image()\n")) |
| |
| |
| /* done with PNG file, so clean up to minimize memory usage (but do NOT |
| * nuke image_data!) */ |
| |
| readpng_cleanup(FALSE); |
| fclose(infile); |
| |
| if (!image_data) { |
| fprintf(stderr, PROGNAME ": unable to decode PNG image\n"); |
| exit(3); |
| } |
| |
| |
| /* display image (composite with background if requested) */ |
| |
| Trace((stderr, "calling rpng_x_display_image()\n")) |
| if (rpng_x_display_image()) { |
| free(image_data); |
| exit(4); |
| } |
| Trace((stderr, "done with rpng_x_display_image()\n")) |
| |
| |
| /* wait for the user to tell us when to quit */ |
| |
| printf( |
| "Done. Press Q, Esc or mouse button 1 (within image window) to quit.\n"); |
| fflush(stdout); |
| |
| do |
| XNextEvent(display, &e); |
| while (!(e.type == ButtonPress && e.xbutton.button == Button1) && |
| !(e.type == KeyPress && /* v--- or 1 for shifted keys */ |
| ((k = XLookupKeysym(&e.xkey, 0)) == XK_q || k == XK_Escape) )); |
| |
| |
| /* OK, we're done: clean up all image and X resources and go away */ |
| |
| rpng_x_cleanup(); |
| |
| (void)argc; /* Unused */ |
| |
| return 0; |
| } |
| |
| |
| |
| |
| |
| static int rpng_x_create_window(void) |
| { |
| uch *xdata; |
| int need_colormap = FALSE; |
| int screen, pad; |
| ulg bg_pixel = 0L; |
| ulg attrmask; |
| Window root; |
| XEvent e; |
| XGCValues gcvalues; |
| XSetWindowAttributes attr; |
| XTextProperty windowName, *pWindowName = &windowName; |
| XTextProperty iconName, *pIconName = &iconName; |
| XVisualInfo visual_info; |
| XSizeHints *size_hints; |
| XWMHints *wm_hints; |
| XClassHint *class_hints; |
| |
| |
| screen = DefaultScreen(display); |
| depth = DisplayPlanes(display, screen); |
| root = RootWindow(display, screen); |
| |
| #ifdef DEBUG |
| XSynchronize(display, True); |
| #endif |
| |
| #if 0 |
| /* GRR: add 8-bit support */ |
| if (/* depth != 8 && */ depth != 16 && depth != 24 && depth != 32) { |
| fprintf(stderr, |
| "screen depth %d not supported (only 16-, 24- or 32-bit TrueColor)\n", |
| depth); |
| return 2; |
| } |
| |
| XMatchVisualInfo(display, screen, depth, |
| (depth == 8)? PseudoColor : TrueColor, &visual_info); |
| visual = visual_info.visual; |
| #else |
| if (depth != 16 && depth != 24 && depth != 32) { |
| int visuals_matched = 0; |
| |
| Trace((stderr, "default depth is %d: checking other visuals\n", |
| depth)) |
| |
| /* 24-bit first */ |
| visual_info.screen = screen; |
| visual_info.depth = 24; |
| visual_list = XGetVisualInfo(display, |
| VisualScreenMask | VisualDepthMask, &visual_info, &visuals_matched); |
| if (visuals_matched == 0) { |
| /* GRR: add 15-, 16- and 32-bit TrueColor visuals (also DirectColor?) */ |
| fprintf(stderr, "default screen depth %d not supported, and no" |
| " 24-bit visuals found\n", depth); |
| return 2; |
| } |
| Trace((stderr, "XGetVisualInfo() returned %d 24-bit visuals\n", |
| visuals_matched)) |
| visual = visual_list[0].visual; |
| depth = visual_list[0].depth; |
| /* |
| colormap_size = visual_list[0].colormap_size; |
| visual_class = visual->class; |
| visualID = XVisualIDFromVisual(visual); |
| */ |
| have_nondefault_visual = TRUE; |
| need_colormap = TRUE; |
| } else { |
| XMatchVisualInfo(display, screen, depth, TrueColor, &visual_info); |
| visual = visual_info.visual; |
| } |
| #endif |
| |
| RMask = visual->red_mask; |
| GMask = visual->green_mask; |
| BMask = visual->blue_mask; |
| |
| /* GRR: add/check 8-bit support */ |
| if (depth == 8 || need_colormap) { |
| colormap = XCreateColormap(display, root, visual, AllocNone); |
| if (!colormap) { |
| fprintf(stderr, "XCreateColormap() failed\n"); |
| return 2; |
| } |
| have_colormap = TRUE; |
| } |
| if (depth == 15 || depth == 16) { |
| RShift = 15 - rpng_x_msb(RMask); /* these are right-shifts */ |
| GShift = 15 - rpng_x_msb(GMask); |
| BShift = 15 - rpng_x_msb(BMask); |
| } else if (depth > 16) { |
| #define NO_24BIT_MASKS |
| #ifdef NO_24BIT_MASKS |
| RShift = rpng_x_msb(RMask) - 7; /* these are left-shifts */ |
| GShift = rpng_x_msb(GMask) - 7; |
| BShift = rpng_x_msb(BMask) - 7; |
| #else |
| RShift = 7 - rpng_x_msb(RMask); /* these are right-shifts, too */ |
| GShift = 7 - rpng_x_msb(GMask); |
| BShift = 7 - rpng_x_msb(BMask); |
| #endif |
| } |
| if (depth >= 15 && (RShift < 0 || GShift < 0 || BShift < 0)) { |
| fprintf(stderr, "rpng internal logic error: negative X shift(s)!\n"); |
| return 2; |
| } |
| |
| /*--------------------------------------------------------------------------- |
| Finally, create the window. |
| ---------------------------------------------------------------------------*/ |
| |
| attr.backing_store = Always; |
| attr.event_mask = ExposureMask | KeyPressMask | ButtonPressMask; |
| attrmask = CWBackingStore | CWEventMask; |
| if (have_nondefault_visual) { |
| attr.colormap = colormap; |
| attr.background_pixel = 0; |
| attr.border_pixel = 1; |
| attrmask |= CWColormap | CWBackPixel | CWBorderPixel; |
| } |
| |
| window = XCreateWindow(display, root, 0, 0, image_width, image_height, 0, |
| depth, InputOutput, visual, attrmask, &attr); |
| |
| if (window == None) { |
| fprintf(stderr, "XCreateWindow() failed\n"); |
| return 2; |
| } else |
| have_window = TRUE; |
| |
| if (depth == 8) |
| XSetWindowColormap(display, window, colormap); |
| |
| if (!XStringListToTextProperty(&window_name, 1, pWindowName)) |
| pWindowName = NULL; |
| if (!XStringListToTextProperty(&icon_name, 1, pIconName)) |
| pIconName = NULL; |
| |
| /* OK if any hints allocation fails; XSetWMProperties() allows NULLs */ |
| |
| 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; |
| } |
