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/*
* imagedisplay.c
*
* Show raw and processed images
*
* (c) 2007 Thomas White <taw27@cam.ac.uk>
* dtr - Diffraction Tomography Reconstruction
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gtk/gtk.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <math.h>
#include "imagedisplay.h"
#include "utils.h"
/* Free pixbuf data when reference count drops to zero */
static void imagedisplay_free_data(guchar *image_eightbit, ImageDisplay *imagedisplay) {
free(image_eightbit);
}
static void imagedisplay_update(ImageDisplay *imagedisplay) {
unsigned int w, h, v_w, v_h;
float aspect_image, aspect_window;
w = imagedisplay->width;
h = imagedisplay->height;
v_w = imagedisplay->view_width;
v_h = imagedisplay->view_height;
/* Preserve aspect ratio */
aspect_image = (float)w/h;
aspect_window = (float)v_w/v_h;
if ( aspect_window > aspect_image ) {
v_w = aspect_image*v_h;
} else {
v_h = v_w/aspect_image;
}
/* Create the scaled pixbuf from the 8-bit display data */
imagedisplay->pixbuf_scaled = gdk_pixbuf_scale_simple(imagedisplay->pixbuf, v_w, v_h, GDK_INTERP_BILINEAR);
/* Create the image with the scaled pixbuf */
if ( !imagedisplay->image ) {
imagedisplay->image = gtk_image_new_from_pixbuf(imagedisplay->pixbuf_scaled);
gtk_container_add(GTK_CONTAINER(imagedisplay->window), imagedisplay->image);
gtk_widget_show(imagedisplay->image);
} else {
gtk_image_set_from_pixbuf(GTK_IMAGE(imagedisplay->image), GDK_PIXBUF(imagedisplay->pixbuf_scaled));
}
}
static gboolean imagedisplay_configure_event(GtkWidget *widget, GdkEventConfigure *event, ImageDisplay *imagedisplay) {
imagedisplay->view_width = event->width;
imagedisplay->view_height = event->height;
imagedisplay_update(imagedisplay);
return FALSE;
}
static void imagedisplay_put_data(ImageDisplay *imagedisplay, int16_t *image16) {
unsigned int x, y;
unsigned int w, h;
h = imagedisplay->height;
w = imagedisplay->width;
/* Turn 16-bit image data into 8-bit display data */
imagedisplay->data = malloc(3*w*h);
for ( y=0; y<h; y++ ) {
for ( x=0; x<w; x++ ) {
int16_t val16 = image16[x+w*y];
if ( val16 > 255 ) {
imagedisplay->data[3*( x+w*(h-1-y) )] = 255;
imagedisplay->data[3*( x+w*(h-1-y) )+1] = 255;
imagedisplay->data[3*( x+w*(h-1-y) )+2] = 255;
} else if ( val16 < 0 ) {
imagedisplay->data[3*( x+w*(h-1-y) )] = 0;
imagedisplay->data[3*( x+w*(h-1-y) )+1] = 0;
imagedisplay->data[3*( x+w*(h-1-y) )+2] = 0;
} else {
imagedisplay->data[3*( x+w*(h-1-y) )] = val16;
imagedisplay->data[3*( x+w*(h-1-y) )+1] = val16;
imagedisplay->data[3*( x+w*(h-1-y) )+2] = val16;
}
}
}
/* Create the pixbuf from the 8-bit display data */
imagedisplay->pixbuf = gdk_pixbuf_new_from_data(imagedisplay->data, GDK_COLORSPACE_RGB, FALSE, 8, w, h, h*3,
(GdkPixbufDestroyNotify)imagedisplay_free_data, imagedisplay);
imagedisplay_update(imagedisplay);
}
static void imagedisplay_close(GtkWidget *widget, ImageDisplay *imagedisplay) {
free(imagedisplay);
}
/* Display an image */
ImageDisplay *imagedisplay_open(int16_t *image, unsigned int width, unsigned int height, const char *title) {
ImageDisplay *imagedisplay;
GdkGeometry geom;
imagedisplay = malloc(sizeof(ImageDisplay));
imagedisplay->image = NULL;
imagedisplay->width = width;
imagedisplay->height = height;
imagedisplay->view_width = 512;
imagedisplay->view_height = 512;
imagedisplay->title = strdup(title);
imagedisplay->window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(imagedisplay->window), imagedisplay->title);
imagedisplay_put_data(imagedisplay, image);
g_signal_connect(GTK_OBJECT(imagedisplay->window), "destroy", G_CALLBACK(imagedisplay_close), imagedisplay);
g_signal_connect(GTK_OBJECT(imagedisplay->window), "configure_event", G_CALLBACK(imagedisplay_configure_event), imagedisplay);
geom.min_width = 128;
geom.min_height = 128;
gtk_window_set_geometry_hints(GTK_WINDOW(imagedisplay->window), GTK_WIDGET(imagedisplay->image), &geom, GDK_HINT_MIN_SIZE);
gtk_window_set_default_size(GTK_WINDOW(imagedisplay->window), 512, 512);
gtk_widget_show_all(imagedisplay->window);
return imagedisplay;
}
void imagedisplay_add_tilt_axis(ImageDisplay *imagedisplay, ControlContext *ctx, double omega) {
guchar *image_eightbit;
int w, h;
double gradient;
if ( !imagedisplay->pixbuf ) return;
w = imagedisplay->width;
h = imagedisplay->height; /* Size of pixbuf */
g_object_get(G_OBJECT(imagedisplay->pixbuf), "pixels", &image_eightbit, NULL);
gradient = tan(M_PI*omega/180);
if ( gradient > 1 ) {
double xs;
signed int x, y;
gradient = 1/gradient;
/* Start at the centre and draw a line out in each direction until it hits an edge.
This makes the whole thing a lot easier. */
xs = ctx->x_centre; y = ctx->y_centre;
do {
x = xs;
image_eightbit[3*(x+w*(h-1-y))+0] = 255;
image_eightbit[3*(x+w*(h-1-y))+1] = 255;
image_eightbit[3*(x+w*(h-1-y))+2] = 0;
y++;
xs += gradient;
} while ( (xs<w) && (y<h) && (xs>=0) && (y>=0) );
xs = ctx->x_centre; y = ctx->y_centre;
do {
x = xs;
image_eightbit[3*(x+w*(h-1-y))+0] = 255;
image_eightbit[3*(x+w*(h-1-y))+1] = 255;
image_eightbit[3*(x+w*(h-1-y))+2] = 0;
y--;
xs -= gradient;
} while ( (xs<w) && (y<h) && (xs>=0) && (y>=0) );
} else {
double ys;
signed int x, y;
x = ctx->x_centre; ys = ctx->y_centre;
do {
y = ys;
image_eightbit[3*(x+w*(h-1-y))+0] = 255;
image_eightbit[3*(x+w*(h-1-y))+1] = 255;
image_eightbit[3*(x+w*(h-1-y))+2] = 0;
x++;
ys += gradient;
} while ( (x<w) && (ys<h) && (x>=0) && (ys>=0) );
x = ctx->x_centre; ys = ctx->y_centre;
do {
y = ys;
image_eightbit[3*(x+w*(h-1-y))+0] = 255;
image_eightbit[3*(x+w*(h-1-y))+1] = 255;
image_eightbit[3*(x+w*(h-1-y))+2] = 0;
x--;
ys -= gradient;
} while ( (x<w) && (ys<h) && (x>=0) && (ys>=0) );
}
}
void imagedisplay_mark_point(ImageDisplay *imagedisplay, unsigned int x, unsigned int y) {
guchar *image_eightbit;
int xd, yd;
int w, h;
if ( !imagedisplay->pixbuf ) return;
w = imagedisplay->width;
h = imagedisplay->height;
g_object_get(G_OBJECT(imagedisplay->pixbuf), "pixels", &image_eightbit, NULL);
if ( (y >= 0) && (y < h) ) {
for ( xd=biggest(x-3, 0); xd<=smallest(x+3, w-1); xd++ ) {
imagedisplay->data[3*( xd+w*(h-1-y) )] = 255;
imagedisplay->data[3*( xd+w*(h-1-y) )+1] = 0;
imagedisplay->data[3*( xd+w*(h-1-y) )+2] = 0;
}
}
if ( (x >= 0) && (x < w) ) {
for ( yd=biggest(y-3, 0); yd<=smallest(y+3, h-1); yd++ ) {
imagedisplay->data[3*( x+w*(h-1-yd) )] = 255;
imagedisplay->data[3*( x+w*(h-1-yd) )+1] = 0;
imagedisplay->data[3*( x+w*(h-1-yd) )+2] = 0;
}
}
}
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