diff options
Diffstat (limited to 'gdk/x11/gdkinput-x11.c')
| -rw-r--r-- | gdk/x11/gdkinput-x11.c | 35 |
1 files changed, 26 insertions, 9 deletions
diff --git a/gdk/x11/gdkinput-x11.c b/gdk/x11/gdkinput-x11.c index 674e905fc..d68e71b41 100644 --- a/gdk/x11/gdkinput-x11.c +++ b/gdk/x11/gdkinput-x11.c @@ -463,15 +463,32 @@ gdk_input_translate_coordinates (GdkDevicePrivate *gdkdev, } else /* GDK_MODE_WINDOW */ { - double device_aspect = (device_height*gdkdev->axes[y_axis].resolution) / - (device_width*gdkdev->axes[x_axis].resolution); - + double x_resolution = gdkdev->axes[x_axis].resolution; + double y_resolution = gdkdev->axes[y_axis].resolution; + double device_aspect; + /* + * Some drivers incorrectly report the resolution of the device + * as zero (in partiular linuxwacom < 0.5.3 with usb tablets). + * This causes the device_aspect to become NaN and totally + * breaks windowed mode. If this is the case, the best we can + * do is to assume the resolution is non-zero is equal in both + * directions (which is true for many devices). The absolute + * value of the resolution doesn't matter since we only use the + * ratio. + */ + if ((x_resolution == 0) || (y_resolution == 0)) + { + x_resolution = 1; + y_resolution = 1; + } + device_aspect = (device_height*y_resolution) / + (device_width*x_resolution); if (device_aspect * impl->width >= impl->height) { /* device taller than window */ x_scale = impl->width / device_width; - y_scale = (x_scale * gdkdev->axes[x_axis].resolution) - / gdkdev->axes[y_axis].resolution; + y_scale = (x_scale * x_resolution) + / y_resolution; x_offset = 0; y_offset = -(device_height * y_scale - @@ -481,8 +498,8 @@ gdk_input_translate_coordinates (GdkDevicePrivate *gdkdev, { /* window taller than device */ y_scale = impl->height / device_height; - x_scale = (y_scale * gdkdev->axes[y_axis].resolution) - / gdkdev->axes[x_axis].resolution; + x_scale = (y_scale * y_resolution) + / x_resolution; y_offset = 0; x_offset = - (device_width * x_scale - impl->width)/2; @@ -494,12 +511,12 @@ gdk_input_translate_coordinates (GdkDevicePrivate *gdkdev, switch (gdkdev->info.axes[i].use) { case GDK_AXIS_X: - axis_out[i] = x_offset + x_scale*axis_data[x_axis]; + axis_out[i] = x_offset + x_scale * axis_data[x_axis]; if (x_out) *x_out = axis_out[i]; break; case GDK_AXIS_Y: - axis_out[i] = y_offset + y_scale*axis_data[y_axis]; + axis_out[i] = y_offset + y_scale * axis_data[y_axis]; if (y_out) *y_out = axis_out[i]; break; |