asview.cpp

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// asview.cpp : Defines the entry point for the application.
//

#include "stdafx.h"

void usage()
{
        printf( "Usage: asview [-h]|[image]\n");
        printf( "Where: image - filename of the image to display.\n");
}

LRESULT CALLBACK MyWindowProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam );
void show_system_error();


HINSTANCE hinst; 
HWND hWnd = NULL ;
void *bmbits = NULL ;
BITMAPINFO *bmi = NULL ;


int APIENTRY 
WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR lpCmdLine, int nCmdShow)
{
        char *image_file = "../apps/rose512.jpg" ;
        
//      char *image_file = "../apps/fore.xpm" ;
        ASImage *im ;
        WNDCLASSEX wnd_class ; 
        ASVisual *asv ;
        MSG msg; 

        if( lpCmdLine != NULL && strncmp( lpCmdLine, "-h", 2 ) == 0 )
        {
                usage();
                return 0;
        }else if( lpCmdLine  != NULL && strlen(lpCmdLine) > 0 ) 
                image_file = lpCmdLine ;
        else
                usage();

        if( image_file[0] == '\"' ) 
        {
                int i = 0;
                while( image_file[i+1] != '\0' && image_file[i+1] !=  '\"')
                {
                        image_file[i] = image_file[i+1] ; 
                        ++i ;
                }
                image_file[i] = '\0' ;
        }

        asv = create_asvisual( NULL, 0, 0, NULL );

        im = file2ASImage( image_file, 0xFFFFFFFF, SCREEN_GAMMA, 0, NULL );
        if( im == NULL ) 
        {
                MessageBox( NULL, "Unable to load image from file.", image_file, MB_OK | MB_ICONINFORMATION );
                return 0 ;
        }
        
        /* converting result into BMP file ( as an example ) */
        /* ASImage2file( im, NULL, "asview.bmp", ASIT_Bmp, NULL ); */
        
        /* The following could be used to dump JPEG version of the image into
         * stdout : */
        /* ASImage2file( im, NULL, NULL, ASIT_Jpeg, NULL ); */


        bmbits = NULL ;
        // Convert ASImage into DIB: 
        bmi = ASImage2DBI( asv, im, 0, 0, im->width, im->height, &bmbits );

        if( bmi == NULL ) 
        {
                MessageBox( NULL, "Failed to convert image into Windows bitmap.", image_file, MB_OK | MB_ICONINFORMATION );
                return 0 ;
        }

        memset( &wnd_class, 0x00, sizeof(wnd_class));
        wnd_class.cbSize = sizeof(wnd_class);
        wnd_class.hInstance = hInstance ;
        wnd_class.lpszClassName = "ASView" ;
        wnd_class.lpfnWndProc = MyWindowProc ;
    wnd_class.hIcon = LoadIcon((HINSTANCE) NULL, IDI_APPLICATION); 
    wnd_class.hCursor = LoadCursor((HINSTANCE) NULL, IDC_ARROW); 
        wnd_class.hbrBackground = (struct HBRUSH__ *)GetStockObject(WHITE_BRUSH); 
        
        if( !RegisterClassEx( &wnd_class ) ) 
        {
                show_system_error();
                return 0 ;
        }

        hinst = hInstance ;
        /* Now let us create a window and display image in that window : */
        hWnd = CreateWindow( "ASView",  image_file,
                                                 WS_OVERLAPPEDWINDOW,  
                                                 CW_USEDEFAULT, CW_USEDEFAULT, 
                                                 bmi->bmiHeader.biWidth, bmi->bmiHeader.biHeight,          
                                                 (HWND) NULL, (HMENU)NULL, hinst, NULL );
        if (!hWnd) 
        {
                show_system_error();
        return FALSE; 
        }

    // Show the window and paint its contents. 
    ShowWindow(hWnd, nCmdShow); 
    UpdateWindow(hWnd); 

    // Start the message loop. 
    while (GetMessage(&msg, hWnd, 0, 0) > 0 ) 
    { 
        TranslateMessage(&msg); 
        DispatchMessage(&msg); 
        } 
        return 0;
}

LRESULT CALLBACK 
MyWindowProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
        if( uMsg == WM_PAINT )
        {
                // Paint image in responce to WM_PAINT event : 
                if( bmi != NULL && bmbits != NULL ) 
                {
                        PAINTSTRUCT ps ;
                        HDC dc  = BeginPaint(hWnd, &ps );
                        StretchDIBits(  dc,                // handle to device context
                                                        0, 0, bmi->bmiHeader.biWidth, bmi->bmiHeader.biHeight, 
                                                        0, 0, bmi->bmiHeader.biWidth, bmi->bmiHeader.biHeight,  
                                                        bmbits, bmi, DIB_RGB_COLORS, SRCCOPY ); 
                        EndPaint(hWnd, &ps );
  
                }
                return 0;
        }
        
        return DefWindowProc( hwnd, uMsg, wParam, lParam ) ;
}

void
show_system_error()
{
        LPVOID lpMsgBuf;
        FormatMessage( 
                FORMAT_MESSAGE_ALLOCATE_BUFFER | 
                FORMAT_MESSAGE_FROM_SYSTEM | 
                FORMAT_MESSAGE_IGNORE_INSERTS,
                NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &lpMsgBuf,
                0, NULL );
        MessageBox( NULL, (LPCTSTR)lpMsgBuf, "ASView System Error", MB_OK | MB_ICONINFORMATION );
        // Free the buffer.
        LocalFree( lpMsgBuf );
}

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