+++ /dev/null
-/*---------------------------------------------------------------------------
-
- 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 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 small X memory leak (thanks to Francois Petitjean)
- - 1.13: 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 "rpng-x"
-#define LONGNAME "Simple PNG Viewer for X"
-#define VERSION "1.13 of 16 August 2001"
-
-#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 *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;
- } else 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);
- }
-
-
- /* usage screen */
-
- 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"
- "\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"
- "\n", PROGNAME, default_display_exponent);
- 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);
-
-
- /* 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();
-
- 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;
- XSizeHints *size_hints;
- XTextProperty windowName, *pWindowName = &windowName;
- XTextProperty iconName, *pIconName = &iconName;
- XVisualInfo visual_info;
- XWMHints *wm_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 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)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 */ ;
- }
-
- 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;
-
-/*---------------------------------------------------------------------------
- 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;
-}
projects / synfig.git / blobdiff