--- /dev/null
+/*---------------------------------------------------------------------------
+
+ rpng2 - progressive-model PNG display program rpng2-x.c
+
+ This program decodes and displays PNG files progressively, as if it were
+ a web browser (though the front end is only set up to read from files).
+ It supports gamma correction, user-specified background colors, and user-
+ specified background patterns (for transparent images). This version is
+ for the X Window System (tested by the author under Unix and by Martin
+ Zinser under OpenVMS; may work under OS/2 with a little tweaking).
+
+ Thanks to Adam Costello and Pieter S. van der Meulen for the "diamond"
+ and "radial waves" patterns, respectively.
+
+ to do:
+ - 8-bit support
+ - finish resizable checkerboard-gradient (sizes 4-128?)
+ - use %.1023s to simplify truncation of title-bar string?
+
+ ---------------------------------------------------------------------------
+
+ Changelog:
+ - 1.01: initial public release
+ - 1.02: modified to allow abbreviated options; fixed char/uchar mismatch
+ - 1.10: added support for non-default visuals; fixed X pixel-conversion
+ - 1.11: added -usleep option for demos; fixed command-line parsing bug
+ - 1.12: added -pause option for demos and testing
+ - 1.20: added runtime MMX-enabling/disabling and new -mmx* options
+ - 1.21: fixed small X memory leak (thanks to Francois Petitjean)
+ - 1.22: fixed XFreeGC() crash bug
+
+ ---------------------------------------------------------------------------
+
+ Copyright (c) 1998-2001 Greg Roelofs. All rights reserved.
+
+ This software is provided "as is," without warranty of any kind,
+ express or implied. In no event shall the author or contributors
+ be held liable for any damages arising in any way from the use of
+ this software.
+
+ Permission is granted to anyone to use this software for any purpose,
+ including commercial applications, and to alter it and redistribute
+ it freely, subject to the following restrictions:
+
+ 1. Redistributions of source code must retain the above copyright
+ notice, disclaimer, and this list of conditions.
+ 2. Redistributions in binary form must reproduce the above copyright
+ notice, disclaimer, and this list of conditions in the documenta-
+ tion and/or other materials provided with the distribution.
+ 3. All advertising materials mentioning features or use of this
+ software must display the following acknowledgment:
+
+ This product includes software developed by Greg Roelofs
+ and contributors for the book, "PNG: The Definitive Guide,"
+ published by O'Reilly and Associates.
+
+ ---------------------------------------------------------------------------*/
+
+#define PROGNAME "rpng2-x"
+#define LONGNAME "Progressive PNG Viewer for X"
+#define VERSION "1.22 of 16 August 2001"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <setjmp.h> /* for jmpbuf declaration in readpng2.h */
+#include <time.h>
+#include <math.h> /* only for PvdM background code */
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/Xos.h>
+#include <X11/keysym.h> /* defines XK_* macros */
+
+#ifdef VMS
+# include <unistd.h>
+#endif
+
+/* all for PvdM background code: */
+#ifndef PI
+# define PI 3.141592653589793238
+#endif
+#define PI_2 (PI*0.5)
+#define INV_PI_360 (360.0 / PI)
+#define MAX(a,b) (a>b?a:b)
+#define MIN(a,b) (a<b?a:b)
+#define CLIP(a,min,max) MAX(min,MIN((a),max))
+#define ABS(a) ((a)<0?-(a):(a))
+#define CLIP8P(c) MAX(0,(MIN((c),255))) /* 8-bit pos. integer (uch) */
+#define ROUNDF(f) ((int)(f + 0.5))
+
+#define rgb1_max bg_freq
+#define rgb1_min bg_gray
+#define rgb2_max bg_bsat
+#define rgb2_min bg_brot
+
+/* #define DEBUG */ /* this enables the Trace() macros */
+
+#include "readpng2.h" /* typedefs, common macros, readpng2 prototypes */
+
+
+/* could just include png.h, but this macro is the only thing we need
+ * (name and typedefs changed to local versions); note that side effects
+ * only happen with alpha (which could easily be avoided with
+ * "ush acopy = (alpha);") */
+
+#define alpha_composite(composite, fg, alpha, bg) { \
+ ush temp = ((ush)(fg)*(ush)(alpha) + \
+ (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \
+ (composite) = (uch)((temp + (temp >> 8)) >> 8); \
+}
+
+
+#define INBUFSIZE 4096 /* with pseudo-timing on (1 sec delay/block), this
+ * block size corresponds roughly to a download
+ * speed 10% faster than theoretical 33.6K maximum
+ * (assuming 8 data bits, 1 stop bit and no other
+ * overhead) */
+
+/* local prototypes */
+static void rpng2_x_init(void);
+static int rpng2_x_create_window(void);
+static int rpng2_x_load_bg_image(void);
+static void rpng2_x_display_row(ulg row);
+static void rpng2_x_finish_display(void);
+static void rpng2_x_cleanup(void);
+static int rpng2_x_msb(ulg u32val);
+
+
+static char titlebar[1024], *window_name = titlebar;
+static char *appname = LONGNAME;
+static char *icon_name = PROGNAME;
+static char *filename;
+static FILE *infile;
+
+static mainprog_info rpng2_info;
+
+static uch inbuf[INBUFSIZE];
+static int incount;
+
+static int pat = 6; /* must be less than num_bgpat */
+static int bg_image = 0;
+static int bgscale = 16;
+static ulg bg_rowbytes;
+static uch *bg_data;
+
+int pause_after_pass = FALSE;
+int demo_timing = FALSE;
+ulg usleep_duration = 0L;
+
+static struct rgb_color {
+ uch r, g, b;
+} rgb[] = {
+ { 0, 0, 0}, /* 0: black */
+ {255, 255, 255}, /* 1: white */
+ {173, 132, 57}, /* 2: tan */
+ { 64, 132, 0}, /* 3: medium green */
+ {189, 117, 1}, /* 4: gold */
+ {253, 249, 1}, /* 5: yellow */
+ { 0, 0, 255}, /* 6: blue */
+ { 0, 0, 120}, /* 7: medium blue */
+ {255, 0, 255}, /* 8: magenta */
+ { 64, 0, 64}, /* 9: dark magenta */
+ {255, 0, 0}, /* 10: red */
+ { 64, 0, 0}, /* 11: dark red */
+ {255, 127, 0}, /* 12: orange */
+ {192, 96, 0}, /* 13: darker orange */
+ { 24, 60, 0}, /* 14: dark green-yellow */
+ { 85, 125, 200} /* 15: ice blue */
+};
+/* not used for now, but should be for error-checking:
+static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);
+ */
+
+/*
+ This whole struct is a fairly cheesy way to keep the number of
+ command-line options to a minimum. The radial-waves background
+ type is a particularly poor fit to the integer elements of the
+ struct...but a few macros and a little fixed-point math will do
+ wonders for ya.
+
+ type bits:
+ F E D C B A 9 8 7 6 5 4 3 2 1 0
+ | | | | |
+ | | +-+-+-- 0 = sharp-edged checkerboard
+ | | 1 = soft diamonds
+ | | 2 = radial waves
+ | | 3-7 = undefined
+ | +-- gradient #2 inverted?
+ +-- alternating columns inverted?
+ */
+static struct background_pattern {
+ ush type;
+ int rgb1_max, rgb1_min; /* or bg_freq, bg_gray */
+ int rgb2_max, rgb2_min; /* or bg_bsat, bg_brot (both scaled by 10)*/
+} bg[] = {
+ {0+8, 2,0, 1,15}, /* checkered: tan/black vs. white/ice blue */
+ {0+24, 2,0, 1,0}, /* checkered: tan/black vs. white/black */
+ {0+8, 4,5, 0,2}, /* checkered: gold/yellow vs. black/tan */
+ {0+8, 4,5, 0,6}, /* checkered: gold/yellow vs. black/blue */
+ {0, 7,0, 8,9}, /* checkered: deep blue/black vs. magenta */
+ {0+8, 13,0, 5,14}, /* checkered: orange/black vs. yellow */
+ {0+8, 12,0, 10,11}, /* checkered: orange/black vs. red */
+ {1, 7,0, 8,0}, /* diamonds: deep blue/black vs. magenta */
+ {1, 12,0, 11,0}, /* diamonds: orange vs. dark red */
+ {1, 10,0, 7,0}, /* diamonds: red vs. medium blue */
+ {1, 4,0, 5,0}, /* diamonds: gold vs. yellow */
+ {1, 3,0, 0,0}, /* diamonds: medium green vs. black */
+ {2, 16, 100, 20, 0}, /* radial: ~hard radial color-beams */
+ {2, 18, 100, 10, 2}, /* radial: soft, curved radial color-beams */
+ {2, 16, 256, 100, 250}, /* radial: very tight spiral */
+ {2, 10000, 256, 11, 0} /* radial: dipole-moire' (almost fractal) */
+};
+static int num_bgpat = sizeof(bg) / sizeof(struct background_pattern);
+
+
+/* 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;
+
+
+
+
+int main(int argc, char **argv)
+{
+#ifdef sgi
+ char tmpline[80];
+#endif
+ char *p, *bgstr = NULL;
+ int rc, alen, flen;
+ int error = 0;
+ int timing = FALSE;
+ int have_bg = FALSE;
+ double LUT_exponent; /* just the lookup table */
+ double CRT_exponent = 2.2; /* just the monitor */
+ double default_display_exponent; /* whole display system */
+ XEvent e;
+ KeySym k;
+
+
+ /* First initialize a few things, just to be sure--memset takes care of
+ * default background color (black), booleans (FALSE), pointers (NULL),
+ * etc. */
+
+ displayname = (char *)NULL;
+ filename = (char *)NULL;
+ memset(&rpng2_info, 0, sizeof(mainprog_info));
+
+
+ /* Set the default value for our display-system exponent, i.e., the
+ * product of the CRT exponent and the exponent corresponding to
+ * the frame-buffer's lookup table (LUT), if any. This is not an
+ * exhaustive list of LUT values (e.g., OpenStep has a lot of weird
+ * ones), but it should cover 99% of the current possibilities. */
+
+#if defined(NeXT)
+ /* third-party utilities can modify the default LUT exponent */
+ LUT_exponent = 1.0 / 2.2;
+ /*
+ if (some_next_function_that_returns_gamma(&next_gamma))
+ LUT_exponent = 1.0 / next_gamma;
+ */
+#elif defined(sgi)
+ LUT_exponent = 1.0 / 1.7;
+ /* there doesn't seem to be any documented function to
+ * get the "gamma" value, so we do it the hard way */
+ infile = fopen("/etc/config/system.glGammaVal", "r");
+ if (infile) {
+ double sgi_gamma;
+
+ fgets(tmpline, 80, infile);
+ fclose(infile);
+ sgi_gamma = atof(tmpline);
+ if (sgi_gamma > 0.0)
+ LUT_exponent = 1.0 / sgi_gamma;
+ }
+#elif defined(Macintosh)
+ LUT_exponent = 1.8 / 2.61;
+ /*
+ if (some_mac_function_that_returns_gamma(&mac_gamma))
+ LUT_exponent = mac_gamma / 2.61;
+ */
+#else
+ LUT_exponent = 1.0; /* assume no LUT: most PCs */
+#endif
+
+ /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */
+ default_display_exponent = LUT_exponent * CRT_exponent;
+
+
+ /* If the user has set the SCREEN_GAMMA environment variable as suggested
+ * (somewhat imprecisely) in the libpng documentation, use that; otherwise
+ * use the default value we just calculated. Either way, the user may
+ * override this via a command-line option. */
+
+ if ((p = getenv("SCREEN_GAMMA")) != NULL)
+ rpng2_info.display_exponent = atof(p);
+ else
+ rpng2_info.display_exponent = default_display_exponent;
+
+
+ /* 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 {
+ rpng2_info.display_exponent = atof(*argv);
+ if (rpng2_info.display_exponent <= 0.0)
+ ++error;
+ }
+ } else if (!strncmp(*argv, "-bgcolor", 4)) {
+ if (!*++argv)
+ ++error;
+ else {
+ bgstr = *argv;
+ if (strlen(bgstr) != 7 || bgstr[0] != '#')
+ ++error;
+ else {
+ have_bg = TRUE;
+ bg_image = FALSE;
+ }
+ }
+ } else if (!strncmp(*argv, "-bgpat", 4)) {
+ if (!*++argv)
+ ++error;
+ else {
+ pat = atoi(*argv) - 1;
+ if (pat < 0 || pat >= num_bgpat)
+ ++error;
+ else {
+ bg_image = TRUE;
+ have_bg = FALSE;
+ }
+ }
+ } else if (!strncmp(*argv, "-usleep", 2)) {
+ if (!*++argv)
+ ++error;
+ else {
+ usleep_duration = (ulg)atol(*argv);
+ demo_timing = TRUE;
+ }
+ } else if (!strncmp(*argv, "-pause", 2)) {
+ pause_after_pass = TRUE;
+ } else if (!strncmp(*argv, "-timing", 2)) {
+ timing = TRUE;
+#if (defined(__i386__) || defined(_M_IX86))
+ } else if (!strncmp(*argv, "-nommxfilters", 7)) {
+ rpng2_info.nommxfilters = TRUE;
+ } else if (!strncmp(*argv, "-nommxcombine", 7)) {
+ rpng2_info.nommxcombine = TRUE;
+ } else if (!strncmp(*argv, "-nommxinterlace", 7)) {
+ rpng2_info.nommxinterlace = TRUE;
+ } else if (!strcmp(*argv, "-nommx")) {
+ rpng2_info.nommxfilters = TRUE;
+ rpng2_info.nommxcombine = TRUE;
+ rpng2_info.nommxinterlace = TRUE;
+#endif
+ } else {
+ if (**argv != '-') {
+ filename = *argv;
+ if (argv[1]) /* shouldn't be any more args after filename */
+ ++error;
+ } else
+ ++error; /* not expecting any other options */
+ }
+ }
+
+ if (!filename) {
+ ++error;
+ } else if (!(infile = fopen(filename, "rb"))) {
+ fprintf(stderr, PROGNAME ": can't open PNG file [%s]\n", filename);
+ ++error;
+ } else {
+ incount = fread(inbuf, 1, INBUFSIZE, infile);
+ if (incount < 8 || !readpng2_check_sig(inbuf, 8)) {
+ fprintf(stderr, PROGNAME
+ ": [%s] is not a PNG file: incorrect signature\n",
+ filename);
+ ++error;
+ } else if ((rc = readpng2_init(&rpng2_info)) != 0) {
+ switch (rc) {
+ case 2:
+ fprintf(stderr, PROGNAME
+ ": [%s] has bad IHDR (libpng longjmp)\n",
+ filename);
+ break;
+ case 4:
+ fprintf(stderr, PROGNAME ": insufficient memory\n");
+ break;
+ default:
+ fprintf(stderr, PROGNAME
+ ": unknown readpng2_init() error\n");
+ break;
+ }
+ ++error;
+ } else {
+ display = XOpenDisplay(displayname);
+ if (!display) {
+ readpng2_cleanup(&rpng2_info);
+ fprintf(stderr, PROGNAME ": can't open X display [%s]\n",
+ displayname? displayname : "default");
+ ++error;
+ }
+ }
+ if (error)
+ fclose(infile);
+ }
+
+
+ /* usage screen */
+
+ if (error) {
+ fprintf(stderr, "\n%s %s: %s\n\n", PROGNAME, VERSION, appname);
+ readpng2_version_info();
+ fprintf(stderr, "\n"
+ "Usage: %s [-display xdpy] [-gamma exp] [-bgcolor bg | -bgpat pat]\n"
+#if (defined(__i386__) || defined(_M_IX86))
+ " %*s [[-nommxfilters] [-nommxcombine] [-nommxinterlace] | -nommx]\n"
+#endif
+ " %*s [-usleep dur | -timing] [-pause] file.png\n\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"
+ "\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; overrides -bgpat\n"
+ " pat \tdesired background pattern number (1-%d); used with\n"
+ "\t\t transparent images; overrides -bgcolor\n"
+#if (defined(__i386__) || defined(_M_IX86))
+ " -nommx*\tdisable optimized MMX routines for decoding row filters,\n"
+ "\t\t combining rows, and expanding interlacing, respectively\n"
+#endif
+ " dur \tduration in microseconds to wait after displaying each\n"
+ "\t\t row (for demo purposes)\n"
+ " -timing\tenables delay for every block read, to simulate modem\n"
+ "\t\t download of image (~36 Kbps)\n"
+ " -pause\tpauses after displaying each pass until key pressed\n"
+ "\nPress Q, Esc or mouse button 1 (within image window, after image\n"
+ "is displayed) to quit.\n"
+ "\n", PROGNAME,
+#if (defined(__i386__) || defined(_M_IX86))
+ strlen(PROGNAME), " ",
+#endif
+ strlen(PROGNAME), " ", default_display_exponent, num_bgpat);
+ exit(1);
+ }
+
+
+ /* set the title-bar string, but make sure buffer doesn't overflow */
+
+ alen = strlen(appname);
+ flen = strlen(filename);
+ if (alen + flen + 3 > 1023)
+ sprintf(titlebar, "%s: ...%s", appname, filename+(alen+flen+6-1023));
+ else
+ sprintf(titlebar, "%s: %s", appname, filename);
+
+
+ /* set some final rpng2_info variables before entering main data loop */
+
+ if (have_bg) {
+ unsigned r, g, b; /* this approach quiets compiler warnings */
+
+ sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
+ rpng2_info.bg_red = (uch)r;
+ rpng2_info.bg_green = (uch)g;
+ rpng2_info.bg_blue = (uch)b;
+ } else
+ rpng2_info.need_bgcolor = TRUE;
+
+ rpng2_info.done = FALSE;
+ rpng2_info.mainprog_init = rpng2_x_init;
+ rpng2_info.mainprog_display_row = rpng2_x_display_row;
+ rpng2_info.mainprog_finish_display = rpng2_x_finish_display;
+
+
+ /* OK, this is the fun part: call readpng2_decode_data() at the start of
+ * the loop to deal with our first buffer of data (read in above to verify
+ * that the file is a PNG image), then loop through the file and continue
+ * calling the same routine to handle each chunk of data. It in turn
+ * passes the data to libpng, which will invoke one or more of our call-
+ * backs as decoded data become available. We optionally call sleep() for
+ * one second per iteration to simulate downloading the image via an analog
+ * modem. */
+
+ for (;;) {
+ Trace((stderr, "about to call readpng2_decode_data()\n"))
+ if (readpng2_decode_data(&rpng2_info, inbuf, incount))
+ ++error;
+ Trace((stderr, "done with readpng2_decode_data()\n"))
+ if (error || feof(infile) || rpng2_info.done)
+ break;
+ if (timing)
+ sleep(1);
+ incount = fread(inbuf, 1, INBUFSIZE, infile);
+ }
+
+
+ /* clean up PNG stuff and report any decoding errors */
+
+ fclose(infile);
+ Trace((stderr, "about to call readpng2_cleanup()\n"))
+ readpng2_cleanup(&rpng2_info);
+
+ if (error) {
+ fprintf(stderr, PROGNAME ": libpng error while decoding PNG image\n");
+ exit(3);
+ }
+
+
+ /* wait for the user to tell us when to quit */
+
+ 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) ));
+
+
+ /* we're done: clean up all image and X resources and go away */
+
+ Trace((stderr, "about to call rpng2_x_cleanup()\n"))
+ rpng2_x_cleanup();
+
+ return 0;
+}
+
+
+
+
+
+/* this function is called by readpng2_info_callback() in readpng2.c, which
+ * in turn is called by libpng after all of the pre-IDAT chunks have been
+ * read and processed--i.e., we now have enough info to finish initializing */
+
+static void rpng2_x_init(void)
+{
+ ulg i;
+ ulg rowbytes = rpng2_info.rowbytes;
+
+ Trace((stderr, "beginning rpng2_x_init()\n"))
+ Trace((stderr, " rowbytes = %ld\n", rpng2_info.rowbytes))
+ Trace((stderr, " width = %ld\n", rpng2_info.width))
+ Trace((stderr, " height = %ld\n", rpng2_info.height))
+
+ rpng2_info.image_data = (uch *)malloc(rowbytes * rpng2_info.height);
+ if (!rpng2_info.image_data) {
+ readpng2_cleanup(&rpng2_info);
+ return;
+ }
+
+ rpng2_info.row_pointers = (uch **)malloc(rpng2_info.height * sizeof(uch *));
+ if (!rpng2_info.row_pointers) {
+ free(rpng2_info.image_data);
+ rpng2_info.image_data = NULL;
+ readpng2_cleanup(&rpng2_info);
+ return;
+ }
+
+ for (i = 0; i < rpng2_info.height; ++i)
+ rpng2_info.row_pointers[i] = rpng2_info.image_data + i*rowbytes;
+
+
+ /* do the basic X initialization stuff, make the window, and fill it with
+ * the user-specified, file-specified or default background color or
+ * pattern */
+
+ if (rpng2_x_create_window()) {
+
+ /* GRR TEMPORARY HACK: this is fundamentally no different from cases
+ * above; libpng should longjmp() back to us when png_ptr goes away.
+ * If we/it segfault instead, seems like a libpng bug... */
+
+ /* we're here via libpng callback, so if window fails, clean and bail */
+printf("readpng2_cleanup.\n");
+ readpng2_cleanup(&rpng2_info);
+ rpng2_x_cleanup();
+ exit(2);
+ }
+}
+
+
+
+
+
+static int rpng2_x_create_window(void)
+{
+ ulg bg_red = rpng2_info.bg_red;
+ ulg bg_green = rpng2_info.bg_green;
+ ulg bg_blue = rpng2_info.bg_blue;
+ ulg bg_pixel = 0L;
+ ulg attrmask;
+ int need_colormap = FALSE;
+ int screen, pad;
+ uch *xdata;
+ Window root;
+ XEvent e;
+ XGCValues gcvalues;
+ XSetWindowAttributes attr;
+ XSizeHints *size_hints;
+ XTextProperty windowName, *pWindowName = &windowName;
+ XTextProperty iconName, *pIconName = &iconName;
+ XVisualInfo visual_info;
+ XWMHints *wm_hints;
+
+
+ Trace((stderr, "beginning rpng2_x_create_window()\n"))
+
+ screen = DefaultScreen(display);
+ depth = DisplayPlanes(display, screen);
+ root = RootWindow(display, screen);
+
+#ifdef DEBUG
+ XSynchronize(display, True);
+#endif
+
+ 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;
+ }
+
+ 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 == 8)
+ bg_image = FALSE; /* gradient just wastes palette entries */
+ }
+ if (depth == 15 || depth == 16) {
+ RShift = 15 - rpng2_x_msb(RMask); /* these are right-shifts */
+ GShift = 15 - rpng2_x_msb(GMask);
+ BShift = 15 - rpng2_x_msb(BMask);
+ } else if (depth > 16) {
+ RShift = rpng2_x_msb(RMask) - 7; /* these are left-shifts */
+ GShift = rpng2_x_msb(GMask) - 7;
+ BShift = rpng2_x_msb(BMask) - 7;
+ }
+ if (depth >= 15 && (RShift < 0 || GShift < 0 || BShift < 0)) {
+ fprintf(stderr, "rpng2 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, rpng2_info.width,
+ rpng2_info.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 either 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)rpng2_info.width;
+ size_hints->min_height = size_hints->max_height =
+ (int)rpng2_info.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 */ ;
+ }
+
+ XSetWMProperties(display, window, pWindowName, pIconName, NULL, 0,
+ size_hints, wm_hints, NULL);
+
+ /* 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);
+
+ XMapWindow(display, window);
+
+ gc = XCreateGC(display, window, 0, &gcvalues);
+ have_gc = TRUE;
+
+/*---------------------------------------------------------------------------
+ Allocate memory for the X- and display-specific version of the image.
+ ---------------------------------------------------------------------------*/
+
+ if (depth == 24 || depth == 32) {
+ xdata = (uch *)malloc(4*rpng2_info.width*rpng2_info.height);
+ pad = 32;
+ } else if (depth == 16) {
+ xdata = (uch *)malloc(2*rpng2_info.width*rpng2_info.height);
+ pad = 16;
+ } else /* depth == 8 */ {
+ xdata = (uch *)malloc(rpng2_info.width*rpng2_info.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, rpng2_info.width, rpng2_info.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 (e.g., 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'll take the easy way out... */
+
+ ximage->byte_order = MSBFirst;
+
+/*---------------------------------------------------------------------------
+ Fill window with the specified background color (default is black) or
+ faked "background image" (but latter is disabled if 8-bit; gradients
+ just waste palette entries).
+ ---------------------------------------------------------------------------*/
+
+ if (bg_image)
+ rpng2_x_load_bg_image(); /* resets bg_image if fails */
+
+ if (!bg_image) {
+ if (depth == 24 || depth == 32) {
+ bg_pixel = (bg_red << RShift) |
+ (bg_green << GShift) |
+ (bg_blue << BShift);
+ } else if (depth == 16) {
+ bg_pixel = (((bg_red << 8) >> RShift) & RMask) |
+ (((bg_green << 8) >> GShift) & GMask) |
+ (((bg_blue << 8) >> BShift) & BMask);
+ } else /* depth == 8 */ {
+
+ /* GRR: add 8-bit support */
+
+ }
+ XSetForeground(display, gc, bg_pixel);
+ XFillRectangle(display, window, gc, 0, 0, rpng2_info.width,
+ rpng2_info.height);
+ }
+
+/*---------------------------------------------------------------------------
+ Wait for first Expose event to do any drawing, then flush and return.
+ ---------------------------------------------------------------------------*/
+
+ do
+ XNextEvent(display, &e);
+ while (e.type != Expose || e.xexpose.count);
+
+ XFlush(display);
+
+ return 0;
+
+} /* end function rpng2_x_create_window() */
+
+
+
+
+
+static int rpng2_x_load_bg_image(void)
+{
+ uch *src;
+ char *dest;
+ uch r1, r2, g1, g2, b1, b2;
+ uch r1_inv, r2_inv, g1_inv, g2_inv, b1_inv, b2_inv;
+ int k, hmax, max;
+ int xidx, yidx, yidx_max = (bgscale-1);
+ int even_odd_vert, even_odd_horiz, even_odd;
+ int invert_gradient2 = (bg[pat].type & 0x08);
+ int invert_column;
+ int ximage_rowbytes = ximage->bytes_per_line;
+ ulg i, row;
+ ulg pixel;
+
+/*---------------------------------------------------------------------------
+ Allocate buffer for fake background image to be used with transparent
+ images; if this fails, revert to plain background color.
+ ---------------------------------------------------------------------------*/
+
+ bg_rowbytes = 3 * rpng2_info.width;
+ bg_data = (uch *)malloc(bg_rowbytes * rpng2_info.height);
+ if (!bg_data) {
+ fprintf(stderr, PROGNAME
+ ": unable to allocate memory for background image\n");
+ bg_image = 0;
+ return 1;
+ }
+
+/*---------------------------------------------------------------------------
+ Vertical gradients (ramps) in NxN squares, alternating direction and
+ colors (N == bgscale).
+ ---------------------------------------------------------------------------*/
+
+ if ((bg[pat].type & 0x07) == 0) {
+ uch r1_min = rgb[bg[pat].rgb1_min].r;
+ uch g1_min = rgb[bg[pat].rgb1_min].g;
+ uch b1_min = rgb[bg[pat].rgb1_min].b;
+ uch r2_min = rgb[bg[pat].rgb2_min].r;
+ uch g2_min = rgb[bg[pat].rgb2_min].g;
+ uch b2_min = rgb[bg[pat].rgb2_min].b;
+ int r1_diff = rgb[bg[pat].rgb1_max].r - r1_min;
+ int g1_diff = rgb[bg[pat].rgb1_max].g - g1_min;
+ int b1_diff = rgb[bg[pat].rgb1_max].b - b1_min;
+ int r2_diff = rgb[bg[pat].rgb2_max].r - r2_min;
+ int g2_diff = rgb[bg[pat].rgb2_max].g - g2_min;
+ int b2_diff = rgb[bg[pat].rgb2_max].b - b2_min;
+
+ for (row = 0; row < rpng2_info.height; ++row) {
+ yidx = (int)(row % bgscale);
+ even_odd_vert = (int)((row / bgscale) & 1);
+
+ r1 = r1_min + (r1_diff * yidx) / yidx_max;
+ g1 = g1_min + (g1_diff * yidx) / yidx_max;
+ b1 = b1_min + (b1_diff * yidx) / yidx_max;
+ r1_inv = r1_min + (r1_diff * (yidx_max-yidx)) / yidx_max;
+ g1_inv = g1_min + (g1_diff * (yidx_max-yidx)) / yidx_max;
+ b1_inv = b1_min + (b1_diff * (yidx_max-yidx)) / yidx_max;
+
+ r2 = r2_min + (r2_diff * yidx) / yidx_max;
+ g2 = g2_min + (g2_diff * yidx) / yidx_max;
+ b2 = b2_min + (b2_diff * yidx) / yidx_max;
+ r2_inv = r2_min + (r2_diff * (yidx_max-yidx)) / yidx_max;
+ g2_inv = g2_min + (g2_diff * (yidx_max-yidx)) / yidx_max;
+ b2_inv = b2_min + (b2_diff * (yidx_max-yidx)) / yidx_max;
+
+ dest = (char *)bg_data + row*bg_rowbytes;
+ for (i = 0; i < rpng2_info.width; ++i) {
+ even_odd_horiz = (int)((i / bgscale) & 1);
+ even_odd = even_odd_vert ^ even_odd_horiz;
+ invert_column =
+ (even_odd_horiz && (bg[pat].type & 0x10));
+ if (even_odd == 0) { /* gradient #1 */
+ if (invert_column) {
+ *dest++ = r1_inv;
+ *dest++ = g1_inv;
+ *dest++ = b1_inv;
+ } else {
+ *dest++ = r1;
+ *dest++ = g1;
+ *dest++ = b1;
+ }
+ } else { /* gradient #2 */
+ if ((invert_column && invert_gradient2) ||
+ (!invert_column && !invert_gradient2))
+ {
+ *dest++ = r2; /* not inverted or */
+ *dest++ = g2; /* doubly inverted */
+ *dest++ = b2;
+ } else {
+ *dest++ = r2_inv;
+ *dest++ = g2_inv; /* singly inverted */
+ *dest++ = b2_inv;
+ }
+ }
+ }
+ }
+
+/*---------------------------------------------------------------------------
+ Soft gradient-diamonds with scale = bgscale. Code contributed by Adam
+ M. Costello.
+ ---------------------------------------------------------------------------*/
+
+ } else if ((bg[pat].type & 0x07) == 1) {
+
+ hmax = (bgscale-1)/2; /* half the max weight of a color */
+ max = 2*hmax; /* the max weight of a color */
+
+ r1 = rgb[bg[pat].rgb1_max].r;
+ g1 = rgb[bg[pat].rgb1_max].g;
+ b1 = rgb[bg[pat].rgb1_max].b;
+ r2 = rgb[bg[pat].rgb2_max].r;
+ g2 = rgb[bg[pat].rgb2_max].g;
+ b2 = rgb[bg[pat].rgb2_max].b;
+
+ for (row = 0; row < rpng2_info.height; ++row) {
+ yidx = (int)(row % bgscale);
+ if (yidx > hmax)
+ yidx = bgscale-1 - yidx;
+ dest = (char *)bg_data + row*bg_rowbytes;
+ for (i = 0; i < rpng2_info.width; ++i) {
+ xidx = (int)(i % bgscale);
+ if (xidx > hmax)
+ xidx = bgscale-1 - xidx;
+ k = xidx + yidx;
+ *dest++ = (k*r1 + (max-k)*r2) / max;
+ *dest++ = (k*g1 + (max-k)*g2) / max;
+ *dest++ = (k*b1 + (max-k)*b2) / max;
+ }
+ }
+
+/*---------------------------------------------------------------------------
+ Radial "starburst" with azimuthal sinusoids; [eventually number of sinu-
+ soids will equal bgscale?]. This one is slow but very cool. Code con-
+ tributed by Pieter S. van der Meulen (originally in Smalltalk).
+ ---------------------------------------------------------------------------*/
+
+ } else if ((bg[pat].type & 0x07) == 2) {
+ uch ch;
+ int ii, x, y, hw, hh, grayspot;
+ double freq, rotate, saturate, gray, intensity;
+ double angle=0.0, aoffset=0.0, maxDist, dist;
+ double red=0.0, green=0.0, blue=0.0, hue, s, v, f, p, q, t;
+
+ fprintf(stderr, "%s: computing radial background...",
+ PROGNAME);
+ fflush(stderr);
+
+ hh = (int)(rpng2_info.height / 2);
+ hw = (int)(rpng2_info.width / 2);
+
+ /* variables for radial waves:
+ * aoffset: number of degrees to rotate hue [CURRENTLY NOT USED]
+ * freq: number of color beams originating from the center
+ * grayspot: size of the graying center area (anti-alias)
+ * rotate: rotation of the beams as a function of radius
+ * saturate: saturation of beams' shape azimuthally
+ */
+ angle = CLIP(angle, 0.0, 360.0);
+ grayspot = CLIP(bg[pat].bg_gray, 1, (hh + hw));
+ freq = MAX((double)bg[pat].bg_freq, 0.0);
+ saturate = (double)bg[pat].bg_bsat * 0.1;
+ rotate = (double)bg[pat].bg_brot * 0.1;
+ gray = 0.0;
+ intensity = 0.0;
+ maxDist = (double)((hw*hw) + (hh*hh));
+
+ for (row = 0; row < rpng2_info.height; ++row) {
+ y = (int)(row - hh);
+ dest = (char *)bg_data + row*bg_rowbytes;
+ for (i = 0; i < rpng2_info.width; ++i) {
+ x = (int)(i - hw);
+ angle = (x == 0)? PI_2 : atan((double)y / (double)x);
+ gray = (double)MAX(ABS(y), ABS(x)) / grayspot;
+ gray = MIN(1.0, gray);
+ dist = (double)((x*x) + (y*y)) / maxDist;
+ intensity = cos((angle+(rotate*dist*PI)) * freq) *
+ gray * saturate;
+ intensity = (MAX(MIN(intensity,1.0),-1.0) + 1.0) * 0.5;
+ hue = (angle + PI) * INV_PI_360 + aoffset;
+ s = gray * ((double)(ABS(x)+ABS(y)) / (double)(hw + hh));
+ s = MIN(MAX(s,0.0), 1.0);
+ v = MIN(MAX(intensity,0.0), 1.0);
+
+ if (s == 0.0) {
+ ch = (uch)(v * 255.0);
+ *dest++ = ch;
+ *dest++ = ch;
+ *dest++ = ch;
+ } else {
+ if ((hue < 0.0) || (hue >= 360.0))
+ hue -= (((int)(hue / 360.0)) * 360.0);
+ hue /= 60.0;
+ ii = (int)hue;
+ f = hue - (double)ii;
+ p = (1.0 - s) * v;
+ q = (1.0 - (s * f)) * v;
+ t = (1.0 - (s * (1.0 - f))) * v;
+ if (ii == 0) { red = v; green = t; blue = p; }
+ else if (ii == 1) { red = q; green = v; blue = p; }
+ else if (ii == 2) { red = p; green = v; blue = t; }
+ else if (ii == 3) { red = p; green = q; blue = v; }
+ else if (ii == 4) { red = t; green = p; blue = v; }
+ else if (ii == 5) { red = v; green = p; blue = q; }
+ *dest++ = (uch)(red * 255.0);
+ *dest++ = (uch)(green * 255.0);
+ *dest++ = (uch)(blue * 255.0);
+ }
+ }
+ }
+ fprintf(stderr, "done.\n");
+ fflush(stderr);
+ }
+
+/*---------------------------------------------------------------------------
+ Blast background image to display buffer before beginning PNG decode.
+ ---------------------------------------------------------------------------*/
+
+ if (depth == 24 || depth == 32) {
+ ulg red, green, blue;
+
+ for (row = 0; row < rpng2_info.height; ++row) {
+ src = bg_data + row*bg_rowbytes;
+ dest = ximage->data + row*ximage_rowbytes;
+ for (i = rpng2_info.width; i > 0; --i) {
+ red = *src++;
+ green = *src++;
+ blue = *src++;
+ 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 if (depth == 16) {
+ ush red, green, blue;
+
+ for (row = 0; row < rpng2_info.height; ++row) {
+ src = bg_data + row*bg_rowbytes;
+ dest = ximage->data + row*ximage_rowbytes;
+ for (i = rpng2_info.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 /* depth == 8 */ {
+
+ /* GRR: add 8-bit support */
+
+ }
+
+ XPutImage(display, window, gc, ximage, 0, 0, 0, 0, rpng2_info.width,
+ rpng2_info.height);
+
+ return 0;
+
+} /* end function rpng2_x_load_bg_image() */
+
+
+
+
+
+static void rpng2_x_display_row(ulg row)
+{
+ uch bg_red = rpng2_info.bg_red;
+ uch bg_green = rpng2_info.bg_green;
+ uch bg_blue = rpng2_info.bg_blue;
+ uch *src, *src2=NULL;
+ char *dest;
+ uch r, g, b, a;
+ int ximage_rowbytes = ximage->bytes_per_line;
+ ulg i, pixel;
+ static int rows=0, prevpass=(-1);
+ static ulg firstrow;
+
+/*---------------------------------------------------------------------------
+ rows and firstrow simply track how many rows (and which ones) have not
+ yet been displayed; alternatively, we could call XPutImage() for every
+ row and not bother with the records-keeping.
+ ---------------------------------------------------------------------------*/
+
+ Trace((stderr, "beginning rpng2_x_display_row()\n"))
+
+ if (rpng2_info.pass != prevpass) {
+ if (pause_after_pass && rpng2_info.pass > 0) {
+ XEvent e;
+ KeySym k;
+
+ fprintf(stderr,
+ "%s: end of pass %d of 7; click in image window to continue\n",
+ PROGNAME, prevpass + 1);
+ do
+ XNextEvent(display, &e);
+ while (!(e.type == ButtonPress && e.xbutton.button == Button1)
+ && !(e.type == KeyPress &&
+ ((k = XLookupKeysym(&e.xkey, 0)) == XK_q
+ || k == XK_Escape) )) ;
+ }
+ fprintf(stderr, "%s: pass %d of 7\r", PROGNAME, rpng2_info.pass + 1);
+ fflush(stderr);
+ prevpass = rpng2_info.pass;
+ }
+
+ if (rows == 0)
+ firstrow = row; /* first row that is not yet displayed */
+
+ ++rows; /* count of rows received but not yet displayed */
+
+/*---------------------------------------------------------------------------
+ Aside from the use of the rpng2_info struct, the lack of an outer loop
+ (over rows) and moving the XPutImage() call outside the "if (depth)"
+ tests, this routine is identical to rpng_x_display_image() in the non-
+ progressive version of the program.
+ ---------------------------------------------------------------------------*/
+
+ if (depth == 24 || depth == 32) {
+ ulg red, green, blue;
+
+ src = rpng2_info.image_data + row*rpng2_info.rowbytes;
+ if (bg_image)
+ src2 = bg_data + row*bg_rowbytes;
+ dest = ximage->data + row*ximage_rowbytes;
+ if (rpng2_info.channels == 3) {
+ for (i = rpng2_info.width; i > 0; --i) {
+ red = *src++;
+ green = *src++;
+ blue = *src++;
+ 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 /* if (rpng2_info.channels == 4) */ {
+ for (i = rpng2_info.width; i > 0; --i) {
+ r = *src++;
+ g = *src++;
+ b = *src++;
+ a = *src++;
+ if (bg_image) {
+ bg_red = *src2++;
+ bg_green = *src2++;
+ bg_blue = *src2++;
+ }
+ if (a == 255) {
+ 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 */
+ /* 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 if (depth == 16) {
+ ush red, green, blue;
+
+ src = rpng2_info.row_pointers[row];
+ if (bg_image)
+ src2 = bg_data + row*bg_rowbytes;
+ dest = ximage->data + row*ximage_rowbytes;
+ if (rpng2_info.channels == 3) {
+ for (i = rpng2_info.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 (rpng2_info.channels == 4) */ {
+ for (i = rpng2_info.width; i > 0; --i) {
+ r = *src++;
+ g = *src++;
+ b = *src++;
+ a = *src++;
+ if (bg_image) {
+ bg_red = *src2++;
+ bg_green = *src2++;
+ bg_blue = *src2++;
+ }
+ if (a == 255) {
+ 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);
+ }
+ }
+
+ } else /* depth == 8 */ {
+
+ /* GRR: add 8-bit support */
+
+ }
+
+
+/*---------------------------------------------------------------------------
+ Display after every 16 rows or when on one of last two rows. (Region
+ may include previously displayed lines due to interlacing--i.e., not
+ contiguous. Also, second-to-last row is final one in interlaced images
+ with odd number of rows.) For demos, flush (and delay) after every 16th
+ row so "sparse" passes don't go twice as fast.
+ ---------------------------------------------------------------------------*/
+
+ if (demo_timing && (row - firstrow >= 16 || row >= rpng2_info.height-2)) {
+ XPutImage(display, window, gc, ximage, 0, (int)firstrow, 0,
+ (int)firstrow, rpng2_info.width, row - firstrow + 1);
+ XFlush(display);
+ rows = 0;
+ usleep(usleep_duration);
+ } else
+ if (!demo_timing && ((rows & 0xf) == 0 || row >= rpng2_info.height-2)) {
+ XPutImage(display, window, gc, ximage, 0, (int)firstrow, 0,
+ (int)firstrow, rpng2_info.width, row - firstrow + 1);
+ XFlush(display);
+ rows = 0;
+ }
+
+}
+
+
+
+
+
+static void rpng2_x_finish_display(void)
+{
+ Trace((stderr, "beginning rpng2_x_finish_display()\n"))
+
+ /* last row has already been displayed by rpng2_x_display_row(), so we
+ * have nothing to do here except set a flag and let the user know that
+ * the image is done */
+
+ rpng2_info.done = TRUE;
+ printf(
+ "Done. Press Q, Esc or mouse button 1 (within image window) to quit.\n");
+ fflush(stdout);
+}
+
+
+
+
+
+static void rpng2_x_cleanup(void)
+{
+ if (bg_image && bg_data) {
+ free(bg_data);
+ bg_data = NULL;
+ }
+
+ if (rpng2_info.image_data) {
+ free(rpng2_info.image_data);
+ rpng2_info.image_data = NULL;
+ }
+
+ if (rpng2_info.row_pointers) {
+ free(rpng2_info.row_pointers);
+ rpng2_info.row_pointers = NULL;
+ }
+
+ if (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 rpng2_x_msb(ulg u32val)
+{
+ int i;
+
+ for (i = 31; i >= 0; --i) {
+ if (u32val & 0x80000000L)
+ break;
+ u32val <<= 1;
+ }
+ return i;
+}
projects / synfig.git / blobdiff