path: root/zbar/processor/win.c

/*------------------------------------------------------------------------
 *  Copyright 2007-2009 (c) Jeff Brown <spadix@users.sourceforge.net>
 *
 *  This file is part of the ZBar Bar Code Reader.
 *
 *  The ZBar Bar Code Reader is free software; you can redistribute it
 *  and/or modify it under the terms of the GNU Lesser Public License as
 *  published by the Free Software Foundation; either version 2.1 of
 *  the License, or (at your option) any later version.
 *
 *  The ZBar Bar Code Reader 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 Lesser Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser Public License
 *  along with the ZBar Bar Code Reader; if not, write to the Free
 *  Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 *  Boston, MA  02110-1301  USA
 *
 *  http://sourceforge.net/projects/zbar
 *------------------------------------------------------------------------*/

#include <assert.h>
#if defined(_MSC_VER)
#include <WinSock2.h>
#endif
#include <windows.h>
#include "processor.h"

#define WIN_STYLE \
    (WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX)
#define EXT_STYLE (WS_EX_APPWINDOW | WS_EX_OVERLAPPEDWINDOW)

struct processor_state_s {
    ATOM registeredClass;
};

int _zbar_event_init(zbar_event_t *event)
{
    *event = CreateEvent(NULL, 0, 0, NULL);
    return ((*event) ? 0 : -1);
}

void _zbar_event_destroy(zbar_event_t *event)
{
    if (*event) {
	CloseHandle(*event);
	*event = NULL;
    }
}

void _zbar_event_trigger(zbar_event_t *event)
{
    SetEvent(*event);
}

/* lock must be held */
int _zbar_event_wait(zbar_event_t *event, zbar_mutex_t *lock,
		     zbar_timer_t *timeout)
{
    int rc;
    if (lock)
	_zbar_mutex_unlock(lock);
    rc = WaitForSingleObject(*event, _zbar_timer_check(timeout));
    if (lock)
	_zbar_mutex_lock(lock);

    if (!rc)
	return (1); /* got event */
    if (rc == WAIT_TIMEOUT)
	return (0); /* timed out */
    return (-1);    /* error (FIXME save info) */
}

int _zbar_thread_start(zbar_thread_t *thr, zbar_thread_proc_t *proc, void *arg,
		       zbar_mutex_t *lock)
{
    HANDLE hthr;
    int rc;
    if (thr->started || thr->running)
	return (-1 /*FIXME*/);
    thr->started = 1;
    _zbar_event_init(&thr->notify);
    _zbar_event_init(&thr->activity);

    hthr = CreateThread(NULL, 0, proc, arg, 0, NULL);
    rc	 = (!hthr || _zbar_event_wait(&thr->activity, NULL, NULL) < 0 ||
	    !thr->running);
    CloseHandle(hthr);
    if (rc) {
	thr->started = 0;
	_zbar_event_destroy(&thr->notify);
	_zbar_event_destroy(&thr->activity);
	return (-1 /*FIXME*/);
    }
    return (0);
}

int _zbar_thread_stop(zbar_thread_t *thr, zbar_mutex_t *lock)
{
    if (thr->started) {
	thr->started = 0;
	_zbar_event_trigger(&thr->notify);
	while (thr->running)
	    /* FIXME time out and abandon? */
	    _zbar_event_wait(&thr->activity, lock, NULL);
	_zbar_event_destroy(&thr->notify);
	_zbar_event_destroy(&thr->activity);
    }
    return (0);
}

static LRESULT CALLBACK win_handle_event(HWND hwnd, UINT message, WPARAM wparam,
					 LPARAM lparam)
{
    zbar_processor_t *proc =
	(zbar_processor_t *)GetWindowLongPtr(hwnd, GWLP_USERDATA);
    /* initialized during window creation */
    if (message == WM_NCCREATE) {
	proc = ((LPCREATESTRUCT)lparam)->lpCreateParams;
	assert(proc);
	SetWindowLongPtr(hwnd, GWLP_USERDATA, (LONG_PTR)proc);
	proc->display = hwnd;

	zbar_window_attach(proc->window, proc->display, proc->xwin);
    } else if (!proc)
	return (DefWindowProc(hwnd, message, wparam, lparam));

    switch (message) {
    case WM_SIZE: {
	RECT r;
	GetClientRect(hwnd, &r);
	zprintf(3, "WM_SIZE %ldx%ld\n", r.right, r.bottom);
	assert(proc);
	zbar_window_resize(proc->window, r.right, r.bottom);
	InvalidateRect(hwnd, NULL, 0);
	return (0);
    }

    case WM_PAINT: {
	PAINTSTRUCT ps;
	BeginPaint(hwnd, &ps);
	if (zbar_window_redraw(proc->window)) {
	    HDC hdc = GetDC(hwnd);
	    RECT r;
	    GetClientRect(hwnd, &r);
	    FillRect(hdc, &r, GetStockObject(BLACK_BRUSH));
	    ReleaseDC(hwnd, hdc);
	}
	EndPaint(hwnd, &ps);
	return (0);
    }

    case WM_CHAR: {
	_zbar_processor_handle_input(proc, wparam);
	return (0);
    }

    case WM_LBUTTONDOWN: {
	_zbar_processor_handle_input(proc, 1);
	return (0);
    }

    case WM_MBUTTONDOWN: {
	_zbar_processor_handle_input(proc, 2);
	return (0);
    }

    case WM_RBUTTONDOWN: {
	_zbar_processor_handle_input(proc, 3);
	return (0);
    }

    case WM_CLOSE: {
	zprintf(3, "WM_CLOSE\n");
	_zbar_processor_handle_input(proc, -1);
	return (1);
    }

    case WM_DESTROY: {
	zprintf(3, "WM_DESTROY\n");
	proc->display = NULL;
	zbar_window_attach(proc->window, NULL, 0);
	return (0);
    }
    }
    return (DefWindowProc(hwnd, message, wparam, lparam));
}

static inline int win_handle_events(zbar_processor_t *proc)
{
    int rc = 0;
    while (1) {
	MSG msg;
	rc = PeekMessage(&msg, proc->display, 0, 0, PM_NOYIELD | PM_REMOVE);
	if (!rc)
	    return (0);
	if (rc < 0)
	    return (err_capture(proc, SEV_ERROR, ZBAR_ERR_WINAPI, __func__,
				"failed to obtain event"));

	TranslateMessage(&msg);
	DispatchMessage(&msg);
    }
}

int _zbar_processor_init(zbar_processor_t *proc)
{
    proc->state = calloc(1, sizeof(processor_state_t));
    return (0);
}

int _zbar_processor_cleanup(zbar_processor_t *proc)
{
    free(proc->state);
    proc->state = 0;
    return (0);
}

int _zbar_processor_input_wait(zbar_processor_t *proc, zbar_event_t *event,
			       int timeout)
{
    int n  = (event) ? 1 : 0;
    int rc = MsgWaitForMultipleObjects(n, event, 0, timeout, QS_ALLINPUT);

    if (rc == n) {
	if (win_handle_events(proc) < 0)
	    return (-1);
	return (1);
    }
    if (!rc)
	return (1);
    if (rc == WAIT_TIMEOUT)
	return (0);
    return (-1);
}

int _zbar_processor_enable(zbar_processor_t *proc)
{
    return (0);
}

static inline ATOM win_register_class(HINSTANCE hmod)
{
    BYTE and_mask[1] = { 0xff };
    BYTE xor_mask[1] = { 0x00 };

    WNDCLASSEX wc = {
	sizeof(WNDCLASSEX),
	0,
    };
    wc.hIcon	     = LoadIcon(NULL, IDI_APPLICATION);
    wc.hInstance     = hmod;
    wc.lpfnWndProc   = win_handle_event;
    wc.lpszClassName = "_ZBar Class";
    wc.style	     = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
    wc.hCursor	     = CreateCursor(hmod, 0, 0, 1, 1, and_mask, xor_mask);

    return (RegisterClassEx(&wc));
}

int _zbar_processor_open(zbar_processor_t *proc, char *title, unsigned width,
			 unsigned height)
{
    ATOM wca;
    RECT r	 = { 0, 0, width, height };
    HMODULE hmod = NULL;
    if (!GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
			       GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
			   (void *)_zbar_processor_open, (HINSTANCE *)&hmod))
	return (err_capture(proc, SEV_ERROR, ZBAR_ERR_WINAPI, __func__,
			    "failed to obtain module handle"));

    wca = win_register_class(hmod);
    if (!wca)
	return (err_capture(proc, SEV_ERROR, ZBAR_ERR_WINAPI, __func__,
			    "failed to register window class"));

    proc->state->registeredClass = wca;
    AdjustWindowRectEx(&r, WIN_STYLE, 0, EXT_STYLE);
    proc->display = CreateWindowEx(EXT_STYLE, (LPCTSTR)(long)wca, "ZBar",
				   WIN_STYLE, CW_USEDEFAULT, CW_USEDEFAULT,
				   r.right - r.left, r.bottom - r.top, NULL,
				   NULL, hmod, proc);

    if (!proc->display)
	return (err_capture(proc, SEV_ERROR, ZBAR_ERR_WINAPI, __func__,
			    "failed to open window"));
    return (0);
}

int _zbar_processor_close(zbar_processor_t *proc)
{
    if (proc->display) {
	DestroyWindow(proc->display);
	UnregisterClass((LPCTSTR)(long)proc->state->registeredClass, 0);
	proc->display = NULL;
    }
    return (0);
}

int _zbar_processor_set_visible(zbar_processor_t *proc, int visible)
{
    ShowWindow(proc->display, (visible) ? SW_SHOWNORMAL : SW_HIDE);
    if (visible)
	InvalidateRect(proc->display, NULL, 0);
    /* no error conditions */
    return (0);
}

int _zbar_processor_set_size(zbar_processor_t *proc, unsigned width,
			     unsigned height)
{
    RECT r = { 0, 0, width, height };
    AdjustWindowRectEx(&r, GetWindowLong(proc->display, GWL_STYLE), 0,
		       GetWindowLong(proc->display, GWL_EXSTYLE));
    if (!SetWindowPos(
	    proc->display, NULL, 0, 0, r.right - r.left, r.bottom - r.top,
	    SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOZORDER | SWP_NOREPOSITION))
	return (-1 /*FIXME*/);

    return (0);
}

int _zbar_processor_invalidate(zbar_processor_t *proc)
{
    if (!InvalidateRect(proc->display, NULL, 0))
	return (-1 /*FIXME*/);

    return (0);
}