Use 64-byte header to ensure frame buffer alignment

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@41029 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/cairodriver/cairodriver.h

@@ -42,7 +42,7 @@
 
 #define DEFAULT_FILE_NAME "map.png"
 
-#define HEADER_SIZE 54
+#define HEADER_SIZE 64
 
 /* Scale for converting colors from [0..255] to cairo's [0.0..1.0] */
 #define COLORSCALE (1.0/255.0)

lib/cairodriver/write_bmp.c

@@ -72,6 +72,7 @@ void cairo_write_bmp(void)
 	G_fatal_error(_("Cairo: unable to open output file <%s>"),
 		      ca.file_name);
 
+    memset(header, 0, sizeof(header));
     make_bmp_header(header);
     fwrite(header, sizeof(header), 1, output);
 

lib/pngdriver/pngdriver.h

@@ -9,7 +9,7 @@
 
 #define FILE_NAME  "map.png"
 
-#define HEADER_SIZE 54
+#define HEADER_SIZE 64
 
 struct png_state
 {

lib/pngdriver/write_bmp.c

@@ -59,6 +59,7 @@ void write_bmp(void)
     if (!output)
 	G_fatal_error("PNG: couldn't open output file %s", png.file_name);
 
+    memset(header, 0, sizeof(header));
     make_bmp_header(header);
     fwrite(header, sizeof(header), 1, output);
 

scripts/wxpyimgview/wxpyimgview_gui.py

@@ -107,11 +107,11 @@ class Application(wx.App):
     def __init__(self):
 	self.image = sys.argv[1]
 	self.fraction = int(sys.argv[2]) / 100.0
-	self.HEADER_SIZE = 54
+	self.HEADER_SIZE = 64
 	wx.App.__init__(self)
 
     def read_bmp_header(self, header):
-	magic, bmfh, bmih = struct.unpack("2s12s40s", header)
+	magic, bmfh, bmih = struct.unpack("2s12s40s10x", header)
 
 	if magic != 'BM':
 	    raise SyntaxError("Invalid magic number")

visualization/wximgview/main.cc

@@ -40,7 +40,7 @@ extern "C" {
 
 #include "wximgview.h"
 
-#define HEADER_SIZE 54
+#define HEADER_SIZE 64
 
 IMPLEMENT_APP_NO_MAIN(MyApp)
 

visualization/ximgview/main.c

@@ -32,7 +32,7 @@
 #include <grass/gis.h>
 #include <grass/glocale.h>
 
-#define HEADER_SIZE 54
+#define HEADER_SIZE 64
 
 Display *dpy;
 int scrn;