hdfsee: Add ability to save image as PNG

Also moves the "Image" menu to "View", where it belongs.

3 files changed, 207 insertions, 4 deletions

diff --git a/src/displaywindow.c b/src/displaywindow.c
index a5141dab..7dd51aea 100644
--- a/src/displaywindow.c
+++ b/src/displaywindow.c
@@ -517,6 +517,92 @@ static gint displaywindow_peak_overlay(GtkWidget *widget, DisplayWindow *dw)
 }
 
 
+struct savedialog {
+	DisplayWindow *dw;
+	GtkWidget *cb;
+};
+
+
+static gint displaywindow_save_response(GtkWidget *d, gint response,
+                                        struct savedialog *cd)
+{
+	DisplayWindow *dw = cd->dw;
+	int r;
+
+	if ( response == GTK_RESPONSE_ACCEPT ) {
+
+		char *file;
+		int type;
+
+		file = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(d));
+
+		type = gtk_combo_box_get_active(GTK_COMBO_BOX(cd->cb));
+
+		if ( type == 0 ) {
+			r = render_png(dw, file);
+		} else if ( type == 1 ) {
+			r = render_tiff_fp(dw, file);
+		} else if ( type == 2 ) {
+			r = render_tiff_int16(dw, file);
+		} else {
+			r = -1;
+		}
+
+		if ( r != 0 ) {
+			displaywindow_error(dw, "Unable to save the image.");
+		}
+
+		g_free(file);
+
+	}
+
+	gtk_widget_destroy(d);
+	free(cd);
+
+	return 0;
+}
+
+
+static gint displaywindow_save(GtkWidget *widget, DisplayWindow *dw)
+{
+	GtkWidget *d, *hbox, *l, *cb;
+	struct savedialog *cd;
+
+	d = gtk_file_chooser_dialog_new("Save Image",
+	                                GTK_WINDOW(dw->window),
+	                                GTK_FILE_CHOOSER_ACTION_SAVE,
+	                                GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
+	                                GTK_STOCK_SAVE, GTK_RESPONSE_ACCEPT,
+	                                NULL);
+
+	gtk_file_chooser_set_do_overwrite_confirmation(GTK_FILE_CHOOSER(d),
+	                                               TRUE);
+
+	hbox = gtk_hbox_new(FALSE, 0);
+	gtk_file_chooser_set_extra_widget(GTK_FILE_CHOOSER(d), hbox);
+	cb = gtk_combo_box_new_text();
+	gtk_box_pack_end(GTK_BOX(hbox), GTK_WIDGET(cb), TRUE, TRUE, 5);
+	l = gtk_label_new("Save as type:");
+	gtk_box_pack_end(GTK_BOX(hbox), GTK_WIDGET(l), FALSE, FALSE, 5);
+
+	gtk_combo_box_append_text(GTK_COMBO_BOX(cb), "PNG - 8 bit RGB");
+	gtk_combo_box_append_text(GTK_COMBO_BOX(cb), "TIFF - Floating point");
+	gtk_combo_box_append_text(GTK_COMBO_BOX(cb), "TIFF - 16 bit integer");
+	gtk_combo_box_set_active(GTK_COMBO_BOX(cb), 0);
+
+	cd = malloc(sizeof(*cd));
+	cd->dw = dw;
+	cd->cb = cb;
+
+	g_signal_connect(G_OBJECT(d), "response",
+	                 G_CALLBACK(displaywindow_save_response), cd);
+
+	gtk_widget_show_all(d);
+
+	return 0;
+}
+
+
 static gint displaywindow_set_colscale(GtkWidget *widget, DisplayWindow *dw)
 {
 	dw->show_col_scale = 1 - dw->show_col_scale;
@@ -701,11 +787,13 @@ static void displaywindow_addmenubar(DisplayWindow *dw, GtkWidget *vbox)
 	GtkActionEntry entries[] = {
 
 		{ "FileAction", NULL, "_File", NULL, NULL, NULL },
-		{ "ImagesAction", NULL, "Images", NULL, NULL, NULL },
+		{ "SaveAction", GTK_STOCK_SAVE, "Save Image...", NULL, NULL,
+			G_CALLBACK(displaywindow_save) },
 		{ "CloseAction", GTK_STOCK_CLOSE, "_Close", NULL, NULL,
 			G_CALLBACK(displaywindow_close) },
 
 		{ "ViewAction", NULL, "_View", NULL, NULL, NULL },
+		{ "ImagesAction", NULL, "Images", NULL, NULL, NULL },
 		{ "BinningAction", NULL, "Set Binning...", "F3", NULL,
 			G_CALLBACK(displaywindow_set_binning) },
 		{ "BoostIntAction", NULL, "Boost Intensity...", "F5", NULL,
@@ -897,13 +985,13 @@ static void displaywindow_update_menus(DisplayWindow *dw)
 		/* Too bad.  You'd better hope that /data/data exists... */
 		ERROR("Couldn't get list of images in HDF file\n");
 		w = gtk_ui_manager_get_widget(dw->ui,
-					      "/ui/displaywindow/file/images");
+					      "/ui/displaywindow/view/images");
 		gtk_widget_set_sensitive(GTK_WIDGET(w), FALSE);
 
 		/* Add a dummy menu so that the user knows what's going on */
 		ms = gtk_menu_new();
 		w = gtk_ui_manager_get_widget(dw->ui,
-		                              "/ui/displaywindow/file/images");
+		                              "/ui/displaywindow/view/images");
 		gtk_menu_item_set_submenu(GTK_MENU_ITEM(w), ms);
 
 		return;
@@ -911,7 +999,7 @@ static void displaywindow_update_menus(DisplayWindow *dw)
 	}
 
 	/* Make new menu be the submenu for File->Images */
-	w = gtk_ui_manager_get_widget(dw->ui, "/ui/displaywindow/file/images");
+	w = gtk_ui_manager_get_widget(dw->ui, "/ui/displaywindow/view/images");
 	gtk_menu_item_set_submenu(GTK_MENU_ITEM(w), ms);
 
 	gtk_widget_show_all(ms);
diff --git a/src/render.c b/src/render.c
index 7c66f67c..e0189b0a 100644
--- a/src/render.c
+++ b/src/render.c
@@ -17,6 +17,7 @@
 #include <gdk-pixbuf/gdk-pixbuf.h>
 #include <math.h>
 #include <stdint.h>
+#include <png.h>
 
 #include "hdf5-file.h"
 #include "render.h"
@@ -325,3 +326,112 @@ GdkPixbuf *render_get_colour_scale(size_t w, size_t h, int monochrome)
 	return gdk_pixbuf_new_from_data(data, GDK_COLORSPACE_RGB, FALSE, 8,
 					w, h, w*3, render_free_data, NULL);
 }
+
+
+int render_png(DisplayWindow *dw, const char *filename)
+{
+	FILE *fh;
+	png_structp png_ptr;
+	png_infop info_ptr;
+	png_bytep *row_pointers;
+	int x, y;
+	float *hdr;
+	float max;
+	int w, h;
+
+	w = dw->width;
+	h = dw->height;
+
+	hdr = render_get_image_binned(dw, dw->binning, &max);
+	if ( hdr == NULL ) return 1;
+
+	fh = fopen(filename, "wb");
+	if ( !fh ) {
+		ERROR("Couldn't open output file.\n");
+		return 1;
+	}
+	png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
+	                                  NULL, NULL, NULL);
+	if ( !png_ptr ) {
+		ERROR("Couldn't create PNG write structure.\n");
+		fclose(fh);
+		return 1;
+	}
+	info_ptr = png_create_info_struct(png_ptr);
+	if ( !info_ptr ) {
+		png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+		ERROR("Couldn't create PNG info structure.\n");
+		fclose(fh);
+		return 1;
+	}
+	if ( setjmp(png_jmpbuf(png_ptr)) ) {
+		png_destroy_write_struct(&png_ptr, &info_ptr);
+		fclose(fh);
+		ERROR( "PNG write failed.\n");
+		return 1;
+	}
+	png_init_io(png_ptr, fh);
+
+	png_set_IHDR(png_ptr, info_ptr, w, h, 8,
+	             PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
+	             PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+
+	row_pointers = malloc(h*sizeof(png_bytep *));
+
+	/* Write the image data */
+	max /= dw->boostint;
+	if ( max <= 6 ) { max = 10; }
+
+	for ( y=0; y<h; y++ ) {
+
+		row_pointers[y] = malloc(w*3);
+
+		for ( x=0; x<w; x++ ) {
+
+			int r, g, b;
+			float val;
+
+			val = hdr[x+w*y];
+
+			RENDER_RGB
+
+			row_pointers[y][3*x] = (png_byte)r;
+			row_pointers[y][3*x+1] = (png_byte)g;
+			row_pointers[y][3*x+2] = (png_byte)b;
+
+		}
+	}
+
+	for ( y=0; y<h/2+1; y++ ) {
+		png_bytep scratch;
+		scratch = row_pointers[y];
+		row_pointers[y] = row_pointers[h-y-1];
+		row_pointers[h-y-1] = scratch;
+	}
+
+	png_set_rows(png_ptr, info_ptr, row_pointers);
+	png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
+
+	png_destroy_write_struct(&png_ptr, &info_ptr);
+	for ( y=0; y<h; y++ ) {
+		free(row_pointers[y]);
+	}
+	free(row_pointers);
+	fclose(fh);
+
+	free(hdr);
+
+	return 0;
+}
+
+
+int render_tiff_fp(DisplayWindow *dw, const char *filename)
+{
+	return 1;
+}
+
+
+int render_tiff_int16(DisplayWindow *dw, const char *filename)
+{
+	return 1;
+}
diff --git a/src/render.h b/src/render.h
index 29f69ec4..c0570d2f 100644
--- a/src/render.h
+++ b/src/render.h
@@ -22,6 +22,7 @@
 #include <stddef.h>
 
 #include "displaywindow.h"
+#include "image.h"
 
 enum {
 	SCALE_COLOUR,
@@ -32,5 +33,9 @@ enum {
 extern GdkPixbuf *render_get_image(DisplayWindow *dw);
 extern GdkPixbuf *render_get_colour_scale(size_t w, size_t h, int scale);
 
+extern int render_png(DisplayWindow *dw, const char *filename);
+extern int render_tiff_fp(DisplayWindow *dw, const char *filename);
+extern int render_tiff_int16(DisplayWindow *dw, const char *filename);
+
 
 #endif	/* RENDER_H */