mirror of
https://github.com/ENSL/NS.git
synced 2024-12-12 05:32:00 +00:00
728 lines
24 KiB
C
728 lines
24 KiB
C
/*---------------------------------------------------------------------------
|
|
|
|
rpng - simple PNG display program rpng-win.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 32-bit Windows; it may compile under 16-bit Windows
|
|
with a little tweaking (or maybe not).
|
|
|
|
to do:
|
|
- handle quoted command-line args (especially filenames with spaces)
|
|
- have minimum window width: oh well
|
|
- use %.1023s to simplify truncation of title-bar string?
|
|
|
|
---------------------------------------------------------------------------
|
|
|
|
Changelog:
|
|
- 1.00: initial public release
|
|
- 1.01: modified to allow abbreviated options; fixed long/ulong mis-
|
|
match; switched to png_jmpbuf() macro
|
|
- 1.02: added extra set of parentheses to png_jmpbuf() macro; fixed
|
|
command-line parsing bug
|
|
- 1.10: enabled "message window"/console (thanks to David Geldreich)
|
|
- 2.00: dual-licensed (added GNU GPL)
|
|
- 2.01: fixed improper display of usage screen on PNG error(s)
|
|
|
|
---------------------------------------------------------------------------
|
|
|
|
Copyright (c) 1998-2008 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-win"
|
|
#define LONGNAME "Simple PNG Viewer for Windows"
|
|
#define VERSION "2.01 of 16 March 2008"
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
#include <windows.h>
|
|
#ifdef __CYGWIN__
|
|
/* getch replacement. Turns out, we don't really need this,
|
|
* but leave it here if we ever enable any of the uses of
|
|
* _getch in the main code
|
|
*/
|
|
#include <unistd.h>
|
|
#include <termio.h>
|
|
#include <sys/ioctl.h>
|
|
int repl_getch( void )
|
|
{
|
|
char ch;
|
|
int fd = fileno(stdin);
|
|
struct termio old_tty, new_tty;
|
|
|
|
ioctl(fd, TCGETA, &old_tty);
|
|
new_tty = old_tty;
|
|
new_tty.c_lflag &= ~(ICANON | ECHO | ISIG);
|
|
ioctl(fd, TCSETA, &new_tty);
|
|
fread(&ch, 1, sizeof(ch), stdin);
|
|
ioctl(fd, TCSETA, &old_tty);
|
|
|
|
return ch;
|
|
}
|
|
#define _getch repl_getch
|
|
#else
|
|
#include <conio.h> /* only for _getch() */
|
|
#endif
|
|
|
|
/* #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_win_create_window(HINSTANCE hInst, int showmode);
|
|
static int rpng_win_display_image(void);
|
|
static void rpng_win_cleanup(void);
|
|
LRESULT CALLBACK rpng_win_wndproc(HWND, UINT, WPARAM, LPARAM);
|
|
|
|
|
|
static char titlebar[1024];
|
|
static char *progname = PROGNAME;
|
|
static char *appname = LONGNAME;
|
|
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;
|
|
|
|
/* Windows-specific variables */
|
|
static ulg wimage_rowbytes;
|
|
static uch *dib;
|
|
static uch *wimage_data;
|
|
static BITMAPINFOHEADER *bmih;
|
|
|
|
static HWND global_hwnd;
|
|
|
|
|
|
|
|
|
|
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
|
|
{
|
|
char *args[1024]; /* arbitrary limit, but should suffice */
|
|
char *p, *q, **argv = args;
|
|
int argc = 0;
|
|
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 */
|
|
MSG msg;
|
|
|
|
|
|
filename = (char *)NULL;
|
|
|
|
#ifndef __CYGWIN__
|
|
/* First reenable console output, which normally goes to the bit bucket
|
|
* for windowed apps. Closing the console window will terminate the
|
|
* app. Thanks to David.Geldreich@realviz.com for supplying the magical
|
|
* incantation. */
|
|
|
|
AllocConsole();
|
|
freopen("CONOUT$", "a", stderr);
|
|
freopen("CONOUT$", "a", stdout);
|
|
#endif
|
|
|
|
|
|
/* Next 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. And
|
|
* yes, these ifdefs are completely wasted in a Windows program... */
|
|
|
|
#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;
|
|
|
|
|
|
/* Windows really hates command lines, so we have to set up our own argv.
|
|
* Note that we do NOT bother with quoted arguments here, so don't use
|
|
* filenames with spaces in 'em! */
|
|
|
|
argv[argc++] = PROGNAME;
|
|
p = cmd;
|
|
for (;;) {
|
|
if (*p == ' ')
|
|
while (*++p == ' ')
|
|
;
|
|
/* now p points at the first non-space after some spaces */
|
|
if (*p == '\0')
|
|
break; /* nothing after the spaces: done */
|
|
argv[argc++] = q = p;
|
|
while (*q && *q != ' ')
|
|
++q;
|
|
/* now q points at a space or the end of the string */
|
|
if (*q == '\0')
|
|
break; /* last argv already terminated; quit */
|
|
*q = '\0'; /* change space to terminator */
|
|
p = q + 1;
|
|
}
|
|
argv[argc] = NULL; /* terminate the argv array itself */
|
|
|
|
|
|
/* Now parse the command line for options and the PNG filename. */
|
|
|
|
while (*++argv && !error) {
|
|
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) {
|
|
#ifndef __CYGWIN__
|
|
int ch;
|
|
#endif
|
|
|
|
fprintf(stderr, "\n%s %s: %s\n\n", PROGNAME, VERSION, appname);
|
|
readpng_version_info();
|
|
fprintf(stderr, "\n"
|
|
"Usage: %s [-gamma exp] [-bgcolor bg] file.png\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 after image is displayed to quit.\n"
|
|
#ifndef __CYGWIN__
|
|
"Press Q or Esc to quit this usage screen.\n"
|
|
#endif
|
|
"\n", PROGNAME, default_display_exponent);
|
|
#ifndef __CYGWIN__
|
|
do
|
|
ch = _getch();
|
|
while (ch != 'q' && ch != 'Q' && ch != 0x1B);
|
|
#endif
|
|
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;
|
|
}
|
|
if (error)
|
|
fclose(infile);
|
|
}
|
|
|
|
|
|
if (error) {
|
|
#ifndef __CYGWIN__
|
|
int ch;
|
|
#endif
|
|
|
|
fprintf(stderr, PROGNAME ": aborting.\n");
|
|
#ifndef __CYGWIN__
|
|
do
|
|
ch = _getch();
|
|
while (ch != 'q' && ch != 'Q' && ch != 0x1B);
|
|
#endif
|
|
exit(2);
|
|
} else {
|
|
fprintf(stderr, "\n%s %s: %s\n", PROGNAME, VERSION, appname);
|
|
#ifndef __CYGWIN__
|
|
fprintf(stderr,
|
|
"\n [console window: closing this window will terminate %s]\n\n",
|
|
PROGNAME);
|
|
#endif
|
|
}
|
|
|
|
|
|
/* 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 Windows initialization stuff, make the window and fill it
|
|
* with the background color */
|
|
|
|
if (rpng_win_create_window(hInst, showmode))
|
|
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_win_display_image()\n"))
|
|
if (rpng_win_display_image()) {
|
|
free(image_data);
|
|
exit(4);
|
|
}
|
|
Trace((stderr, "done with rpng_win_display_image()\n"))
|
|
|
|
|
|
/* wait for the user to tell us when to quit */
|
|
|
|
printf(
|
|
#ifndef __CYGWIN__
|
|
"Done. Press Q, Esc or mouse button 1 (within image window) to quit.\n"
|
|
#else
|
|
"Done. Press mouse button 1 (within image window) to quit.\n"
|
|
#endif
|
|
);
|
|
fflush(stdout);
|
|
|
|
while (GetMessage(&msg, NULL, 0, 0)) {
|
|
TranslateMessage(&msg);
|
|
DispatchMessage(&msg);
|
|
}
|
|
|
|
|
|
/* OK, we're done: clean up all image and Windows resources and go away */
|
|
|
|
rpng_win_cleanup();
|
|
|
|
return msg.wParam;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int rpng_win_create_window(HINSTANCE hInst, int showmode)
|
|
{
|
|
uch *dest;
|
|
int extra_width, extra_height;
|
|
ulg i, j;
|
|
WNDCLASSEX wndclass;
|
|
|
|
|
|
/*---------------------------------------------------------------------------
|
|
Allocate memory for the display-specific version of the image (round up
|
|
to multiple of 4 for Windows DIB).
|
|
---------------------------------------------------------------------------*/
|
|
|
|
wimage_rowbytes = ((3*image_width + 3L) >> 2) << 2;
|
|
|
|
if (!(dib = (uch *)malloc(sizeof(BITMAPINFOHEADER) +
|
|
wimage_rowbytes*image_height)))
|
|
{
|
|
return 4; /* fail */
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------
|
|
Initialize the DIB. Negative height means to use top-down BMP ordering
|
|
(must be uncompressed, but that's what we want). Bit count of 1, 4 or 8
|
|
implies a colormap of RGBX quads, but 24-bit BMPs just use B,G,R values
|
|
directly => wimage_data begins immediately after BMP header.
|
|
---------------------------------------------------------------------------*/
|
|
|
|
memset(dib, 0, sizeof(BITMAPINFOHEADER));
|
|
bmih = (BITMAPINFOHEADER *)dib;
|
|
bmih->biSize = sizeof(BITMAPINFOHEADER);
|
|
bmih->biWidth = image_width;
|
|
bmih->biHeight = -((long)image_height);
|
|
bmih->biPlanes = 1;
|
|
bmih->biBitCount = 24;
|
|
bmih->biCompression = 0;
|
|
wimage_data = dib + sizeof(BITMAPINFOHEADER);
|
|
|
|
/*---------------------------------------------------------------------------
|
|
Fill in background color (black by default); data are in BGR order.
|
|
---------------------------------------------------------------------------*/
|
|
|
|
for (j = 0; j < image_height; ++j) {
|
|
dest = wimage_data + j*wimage_rowbytes;
|
|
for (i = image_width; i > 0; --i) {
|
|
*dest++ = bg_blue;
|
|
*dest++ = bg_green;
|
|
*dest++ = bg_red;
|
|
}
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------
|
|
Set the window parameters.
|
|
---------------------------------------------------------------------------*/
|
|
|
|
memset(&wndclass, 0, sizeof(wndclass));
|
|
|
|
wndclass.cbSize = sizeof(wndclass);
|
|
wndclass.style = CS_HREDRAW | CS_VREDRAW;
|
|
wndclass.lpfnWndProc = rpng_win_wndproc;
|
|
wndclass.hInstance = hInst;
|
|
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
|
|
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
|
|
wndclass.hbrBackground = (HBRUSH)GetStockObject(DKGRAY_BRUSH);
|
|
wndclass.lpszMenuName = NULL;
|
|
wndclass.lpszClassName = progname;
|
|
wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
|
|
|
|
RegisterClassEx(&wndclass);
|
|
|
|
/*---------------------------------------------------------------------------
|
|
Finally, create the window.
|
|
---------------------------------------------------------------------------*/
|
|
|
|
extra_width = 2*(GetSystemMetrics(SM_CXBORDER) +
|
|
GetSystemMetrics(SM_CXDLGFRAME));
|
|
extra_height = 2*(GetSystemMetrics(SM_CYBORDER) +
|
|
GetSystemMetrics(SM_CYDLGFRAME)) +
|
|
GetSystemMetrics(SM_CYCAPTION);
|
|
|
|
global_hwnd = CreateWindow(progname, titlebar, WS_OVERLAPPEDWINDOW,
|
|
CW_USEDEFAULT, CW_USEDEFAULT, image_width+extra_width,
|
|
image_height+extra_height, NULL, NULL, hInst, NULL);
|
|
|
|
ShowWindow(global_hwnd, showmode);
|
|
UpdateWindow(global_hwnd);
|
|
|
|
return 0;
|
|
|
|
} /* end function rpng_win_create_window() */
|
|
|
|
|
|
|
|
|
|
|
|
static int rpng_win_display_image()
|
|
{
|
|
uch *src, *dest;
|
|
uch r, g, b, a;
|
|
ulg i, row, lastrow;
|
|
RECT rect;
|
|
|
|
|
|
Trace((stderr, "beginning display loop (image_channels == %d)\n",
|
|
image_channels))
|
|
Trace((stderr, "(width = %ld, rowbytes = %ld, wimage_rowbytes = %d)\n",
|
|
image_width, image_rowbytes, wimage_rowbytes))
|
|
|
|
|
|
/*---------------------------------------------------------------------------
|
|
Blast image data to buffer. This whole routine takes place before the
|
|
message loop begins, so there's no real point in any pseudo-progressive
|
|
display...
|
|
---------------------------------------------------------------------------*/
|
|
|
|
for (lastrow = row = 0; row < image_height; ++row) {
|
|
src = image_data + row*image_rowbytes;
|
|
dest = wimage_data + row*wimage_rowbytes;
|
|
if (image_channels == 3) {
|
|
for (i = image_width; i > 0; --i) {
|
|
r = *src++;
|
|
g = *src++;
|
|
b = *src++;
|
|
*dest++ = b;
|
|
*dest++ = g; /* note reverse order */
|
|
*dest++ = r;
|
|
}
|
|
} else /* if (image_channels == 4) */ {
|
|
for (i = image_width; i > 0; --i) {
|
|
r = *src++;
|
|
g = *src++;
|
|
b = *src++;
|
|
a = *src++;
|
|
if (a == 255) {
|
|
*dest++ = b;
|
|
*dest++ = g;
|
|
*dest++ = r;
|
|
} else if (a == 0) {
|
|
*dest++ = bg_blue;
|
|
*dest++ = bg_green;
|
|
*dest++ = bg_red;
|
|
} else {
|
|
/* this macro (copied from png.h) composites the
|
|
* foreground and background values and puts the
|
|
* result into the first argument; there are no
|
|
* side effects with the first argument */
|
|
alpha_composite(*dest++, b, a, bg_blue);
|
|
alpha_composite(*dest++, g, a, bg_green);
|
|
alpha_composite(*dest++, r, a, bg_red);
|
|
}
|
|
}
|
|
}
|
|
/* display after every 16 lines */
|
|
if (((row+1) & 0xf) == 0) {
|
|
rect.left = 0L;
|
|
rect.top = (LONG)lastrow;
|
|
rect.right = (LONG)image_width; /* possibly off by one? */
|
|
rect.bottom = (LONG)lastrow + 16L; /* possibly off by one? */
|
|
InvalidateRect(global_hwnd, &rect, FALSE);
|
|
UpdateWindow(global_hwnd); /* similar to XFlush() */
|
|
lastrow = row + 1;
|
|
}
|
|
}
|
|
|
|
Trace((stderr, "calling final image-flush routine\n"))
|
|
if (lastrow < image_height) {
|
|
rect.left = 0L;
|
|
rect.top = (LONG)lastrow;
|
|
rect.right = (LONG)image_width; /* possibly off by one? */
|
|
rect.bottom = (LONG)image_height; /* possibly off by one? */
|
|
InvalidateRect(global_hwnd, &rect, FALSE);
|
|
UpdateWindow(global_hwnd); /* similar to XFlush() */
|
|
}
|
|
|
|
/*
|
|
last param determines whether or not background is wiped before paint
|
|
InvalidateRect(global_hwnd, NULL, TRUE);
|
|
UpdateWindow(global_hwnd);
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void rpng_win_cleanup()
|
|
{
|
|
if (image_data) {
|
|
free(image_data);
|
|
image_data = NULL;
|
|
}
|
|
|
|
if (dib) {
|
|
free(dib);
|
|
dib = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
LRESULT CALLBACK rpng_win_wndproc(HWND hwnd, UINT iMsg, WPARAM wP, LPARAM lP)
|
|
{
|
|
HDC hdc;
|
|
PAINTSTRUCT ps;
|
|
int rc;
|
|
|
|
switch (iMsg) {
|
|
case WM_CREATE:
|
|
/* one-time processing here, if any */
|
|
return 0;
|
|
|
|
case WM_PAINT:
|
|
hdc = BeginPaint(hwnd, &ps);
|
|
/* dest */
|
|
rc = StretchDIBits(hdc, 0, 0, image_width, image_height,
|
|
/* source */
|
|
0, 0, image_width, image_height,
|
|
wimage_data, (BITMAPINFO *)bmih,
|
|
/* iUsage: no clue */
|
|
0, SRCCOPY);
|
|
EndPaint(hwnd, &ps);
|
|
return 0;
|
|
|
|
/* wait for the user to tell us when to quit */
|
|
case WM_CHAR:
|
|
switch (wP) { /* only need one, so ignore repeat count */
|
|
case 'q':
|
|
case 'Q':
|
|
case 0x1B: /* Esc key */
|
|
PostQuitMessage(0);
|
|
}
|
|
return 0;
|
|
|
|
case WM_LBUTTONDOWN: /* another way of quitting */
|
|
case WM_DESTROY:
|
|
PostQuitMessage(0);
|
|
return 0;
|
|
}
|
|
|
|
return DefWindowProc(hwnd, iMsg, wP, lP);
|
|
}
|