Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice (including the next
paragraph) shall be included in all copies or substantial portions of the
Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
The xmag_multivis program allows you to magnify portions of the screen. If no explicit region is specified, a square centered around the pointer is displayed indicating the area to be enlarged. Once a region has been selected, a window is popped up showing a blown up version of the region in which each pixel in the source image is represented by a small square of the same color. Pressing Button1 on the pointer in the enlargement window pops up a small window displaying, in hexadecimal notation, the position, pixel value, and RGB value of the pixel under the pointer until the button is released. Pressing the space bar or any other pointer button removes the enlarged image so that another region may be selected. Pressing ``q'', ``Q'', or ``^C'' in the enlargement window exits the program.
On displays that export multiple Visuals, the selected region is first examined for overlaps by windows of differing depth, visual or colormap. If the selected region does contain such windows, the image displayed in the enlargement window is constructed by compositing the images from the various windows under the selected region. In this case, the composite image will only be displayed in a TrueColor 24 bit deep window, provided such a window can be created on that screen. The image displayed in the enlargement window will exhibit true colors for every pixel in the composite image, regardless of the Colormap state (Installed/UnInstalled) of any of the windows within the selected region.
8 -display " display" This option specifies the X server to use for both reading the screen and displaying the enlarged version of the image.
8 -geometry " geom" This option specifies the size and/or location of the enlargement window. By default, the size is computed from the size of the source region and the desired magnification. Therefore, only one of -source " size" and -mag " magfactor" options may be specified if a window size is given with this option.
8 -source " geom" This option specifies the size and/or location of the source region on the screen. By default, a 64x64 square centered about the pointer is provided for the user to select an area of the screen. The size of the source is used with the desired magnification to compute the default enlargement window size. Therefore, only one of -geometry " size" and -mag " magfactor" options may be specified if a source size is given with this option.
8 -mag " magfactor" This option specifies an integral factor by which the source region should be enlarged. The default magnification is 5. This is used with the size of the source to compute the default enlargement window size. Therefore, only one of -geometry " size" and -source " geom" options may be specified if a magnification factor is given with this option.
8 -bw " pixels" This option specifies the width in pixels of the border surrounding the enlargement window.
8 -bd " color" This option specifies the color to use for the border surrounding the enlargement window.
8 -bg " colororpixelvalue" This option specifies the name of the color to be used as the background of the enlargement window. If the name begins with a percent size (%), it is interpreted to be an absolute pixel value. This is useful when displaying large areas since pixels that are the same color as the background do not need to be painted in the enlargement. The default is to use the BlackPixel of the screen.
8 -fn " fontname" This option specifies the name of a font to use when displaying pixel values (used when Button1 is pressed in the enlargement window).
8 -z This option indicates that the server should be grabbed during the dynamics and the call to XGetImage. This is useful for ensuring that clients don't change their state as a result of entering or leaving them with the pointer.
8 geometry " (class " Geometry ")" Specifies the size and/or location of the enlargement window.
8 source " (class " Source ")" Specifies the size and/or location of the source region on the screen.
8 magnification " (class " Magnification ")" Specifies the enlargement factor.
8 borderWidth " (class " BorderWidth ")" Specifies the border width in pixels.
8 borderColor " (class " BorderColor ")" Specifies the color of the border.
8 background " (class " Background ")" Specifies the color or pixel value to be used for the background of the enlargement window.
8 font " (class " Font ")" Specifies the name of the font to use when displaying pixel values when the user presses Button1 in the enlargement window.
On displays that export multiple visuals, if the selected region needs to be composited from each window, xmag_multivis insists on a TrueColor 24 bit window to display the selected region, and exits with a failure if such a window cannot be created. It would be nice, instead if xmag_multivis would determine the best possible visual to display the image, or instead tried to display the image in a visual selected by the user in a command line option.
Because the window size equals the source size times the magnification, you only need to specify two of the three parameters. This can be confusing.
Being able to drag the pointer around and see a dynamic display would be very nice.
Another possible interface would be for the user to drag out the desired area to be enlarged.
Copyright 1988, Massachusetts Institute of Technology.
MultiVisual code: Copyright 1990, 1997, Oracle and/or its affiliates. All rights reserved.
Jim Fulton, MIT X Consortium
MultiVisual code: Milind Pansare, Sun Microsystems, Inc.