/* * * Sample Code for Gtk+ Programming in C, 1st Edition, Prentice Hall * * Copyright 2000 - 2002 Syd Logan, All Rights Reserved * * This code is distributed without warranty. You are free to use this * code for any purpose, however, if this code is republished or * redistributed in its original form, as hardcopy or electronically, * then you must include this copyright notice along with the code. * * Questions or comments regarding this code or any bugs it contains can * be directed to the author via e-mail at slogan@cts.com **/#include <tiffio.h>#include <stdlib.h>#include <gtk/gtk.h>#include <X11/Xlib.h>static uint32 *raster;static int width, height;static GtkWidget *preview;uint32 *scale( uint32 *raster, int width, int height ){  return raster;}inttimeoutfunc( gpointer data ){  guint i, j, k, RGB;  guchar *buf;  static int foo = 0;  static int dither = 0;  static double gamma = 1.0;#if 0  if ( allocation->width != widget->requisition.width ||    allocation->height != widget->requisition.height &&    preview->expand == TRUE )   {    width = allocation->width;    height = allocation->height;    gtk_preview_size( preview, width, height );    raster = scale( raster, width, height );  }#endif  buf = (guchar *) malloc(width * 3);  if ( !buf )    return;  gtk_preview_set_gamma( gamma );  gtk_preview_set_dither(GTK_PREVIEW (preview), dither);  for ( i = 0; i < height; i++ ) {    for ( j = 0, k = 0; j < width; j++ ) {#if 0      RGB = raster[((height - 1) - i) * width + j];      buf[k+0] = TIFFGetR(RGB) / (foo ? 2 : 1 );      buf[k+1] = TIFFGetG(RGB) / (foo ? 2 : 1 );      buf[k+2] = TIFFGetB(RGB) / (foo ? 2 : 1 );      k += 3;#else      RGB = raster[((height - 1) - i) * width + j];      buf[k+0] = TIFFGetR(RGB);      buf[k+1] = TIFFGetG(RGB);      buf[k+2] = TIFFGetB(RGB);      k += 3;#endif    }    gtk_preview_draw_row(GTK_PREVIEW(preview), buf, 0, i, width);  }  if ( buf )    free( buf );  foo = !foo;  dither++;  if ( dither == 3 )    dither = 0;  gamma += 0.1;  if ( gamma >= 1.1 )    gamma = 0.0;		  gtk_widget_queue_draw (GTK_WIDGET (preview));  return TRUE;}voidSizeAllocation( GtkWidget *widget, GtkAllocation  *allocation){  guint i, j, k, RGB;  GtkPreview *preview = GTK_PREVIEW( widget );  guchar *buf;#if 0  if ( allocation->width != widget->requisition.width ||    allocation->height != widget->requisition.height &&    preview->expand == TRUE )   {    width = allocation->width;    height = allocation->height;    gtk_preview_size( preview, width, height );    raster = scale( raster, width, height );  }#endif  buf = (guchar *) malloc(width * 3);  if ( !buf )    return;  for ( i = 0; i < height; i++ ) {    for ( j = 0, k = 0; j < width; j++ ) {      RGB = raster[((height - 1) - i) * width + j];      buf[k+0] = TIFFGetR(RGB);      buf[k+1] = TIFFGetG(RGB);      buf[k+2] = TIFFGetB(RGB);      k += 3;    }    gtk_preview_draw_row(GTK_PREVIEW(preview), buf, 0, i, width);  }  if ( buf )    free( buf );}int main( int argc, char *argv[] ){  uint32 RGB, pixel;  uint16 bitspersample, samplesperpixel;  GtkWidget *window, *vbox;  TIFF *tif;  gtk_init( &argc, &argv );  window = gtk_window_new( GTK_WINDOW_TOPLEVEL );  tif = TIFFOpen(argv[1], "r");  if ( !tif ) {    printf( "Unable to open tiff file %s\n", argv[1] );    exit( 1 );  }  TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &width);  TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &height);  TIFFGetField(tif, TIFFTAG_BITSPERSAMPLE, &bitspersample);  TIFFGetField(tif, TIFFTAG_SAMPLESPERPIXEL, &samplesperpixel);  if ( samplesperpixel != 3 ) {    printf( "Error: image is not RGB.\n" );    exit( 1 );  }  raster = (uint32*)malloc(width * height * sizeof (uint32));  if ( !raster ) {    perror( "malloc" );    exit( 1 );  }  if (!TIFFReadRGBAImage(tif, width, height, raster, 0)) {    printf( "TIFFReadRGBAImage() failed\n" );    exit( 1 );  }  gtk_widget_set_usize( window, width, height );  vbox = gtk_vbox_new(FALSE, 0);  gtk_container_add(GTK_CONTAINER(window), vbox);  preview = gtk_preview_new(GTK_PREVIEW_COLOR);  gtk_preview_size(GTK_PREVIEW (preview), width, height);  gtk_preview_set_expand(GTK_PREVIEW (preview), TRUE);  gtk_signal_connect(GTK_OBJECT (preview), "size_allocate",    GTK_SIGNAL_FUNC (SizeAllocation), NULL);  gtk_box_pack_start( GTK_BOX(vbox), preview, TRUE, TRUE, 0);  gtk_timeout_add(100, timeoutfunc, NULL);  gtk_widget_show_all( window );  gtk_main();}