Author: matt
Date: 2008-10-19 13:35:32 -0700 (Sun, 19 Oct 2008)
New Revision: 6475
Log:
Improved stability of fl_read_image (STR #2021)
Modified:
branches/branch-1.1/CHANGES
branches/branch-1.1/src/fl_read_image.cxx
Modified: branches/branch-1.1/CHANGES
===================================================================
--- branches/branch-1.1/CHANGES 2008-10-19 20:15:48 UTC (rev 6474)
+++ branches/branch-1.1/CHANGES 2008-10-19 20:35:32 UTC (rev 6475)
@@ -11,6 +11,7 @@
resizing their children (STR #2032)
- Fixed adding an idle handler during
a draw() call (STR #1950)
+ - Improved stability of fl_read_image (STR #2021)
CHANGES IN FLTK 1.1.9
Modified: branches/branch-1.1/src/fl_read_image.cxx
===================================================================
--- branches/branch-1.1/src/fl_read_image.cxx 2008-10-19 20:15:48 UTC (rev
6474)
+++ branches/branch-1.1/src/fl_read_image.cxx 2008-10-19 20:35:32 UTC (rev
6475)
@@ -77,6 +77,11 @@
return off;
}
+// this handler will catch and ignore exceptions during XGetImage
+// to avoid an application crash
+static int xgetimageerrhandler(Display *display, XErrorEvent *error) {
+ return 0;
+}
//
// 'fl_read_image()' - Read an image from the current window.
@@ -135,7 +140,11 @@
}
if (!win || (dx >= sx && dy >= sy && dx + w <= sw && dy + h <= sh)) {
// the image is fully contained, we can use the traditional method
+ // however, if the window is obscured etc. the function will still fail.
Make sure we
+ // catch the error and continue, otherwise an exception will be thrown.
+ XErrorHandler old_handler = XSetErrorHandler(xgetimageerrhandler);
image = XGetImage(fl_display, fl_window, X, Y, w, h, AllPlanes, ZPixmap);
+ XSetErrorHandler(old_handler);
} else {
// image is crossing borders, determine visible region
int nw, nh, noffx, noffy;
@@ -151,10 +160,13 @@
if (!image) {
if (buf) free(buf);
return 0;
- }
+ }
- if (!XGetSubImage(fl_display, fl_window, X + noffx, Y + noffy,
- nw, nh, AllPlanes, ZPixmap, image, noffx, noffy)) {
+ XErrorHandler old_handler = XSetErrorHandler(xgetimageerrhandler);
+ XImage *subimg = XGetSubImage(fl_display, fl_window, X + noffx, Y +
noffy,
+ nw, nh, AllPlanes, ZPixmap, image, noffx,
noffy);
+ XSetErrorHandler(old_handler);
+ if (!subimg) {
XDestroyImage(image);
return 0;
}
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