167 lines
4.7 KiB
Text
167 lines
4.7 KiB
Text
.TH TWEAK 1
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.CT 1 graphics
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.SH NAME
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tweak \- edit image files, subfont files, face files, etc.
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.SH SYNOPSIS
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.B tweak
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[
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.I file ...
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]
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.SH DESCRIPTION
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.I Tweak
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edits existing files holding various forms of images.
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To create original images, start from an existing image, subfont, etc.
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.PP
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.I Tweak
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reads its argument
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.I files
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and displays the resulting images in a vertical column.
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If the image is too wide to fit across the display, it
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is folded much like a long line of text in an
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.IR rio
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window.
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Under each image is displayed one or two lines of text
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presenting its parameters.
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The first line shows the image's
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.BR depth ,
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the number
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of bits per pixel;
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.BR r ,
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the rectangle covered by the image;
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and the name of the
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.B file
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from which it was read.
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If the file is a subfont, a second line presents a hexadecimal 16-bit
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.B offset
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to be applied to character values from the subfont
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(typically as stored in a font file; see
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.IR font (6));
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and the subfont's
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.BR n ,
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.BR height ,
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and
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.B ascent
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as defined in
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.IR cachechars (2).
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.PP
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By means described below, magnified views of portions of the images
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may be displayed.
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The text associated with such a view includes
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.BR mag ,
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the magnification.
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If the view is of a single character from a subfont, the second
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line of text shows the character's value (including the subfont's offset)
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in hexadecimal and as a character in
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.I tweak's
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default font; the character's
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.BR x ,
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.BR top ,
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.BR bottom ,
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.BR left ,
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and
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.BR width
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as defined in
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.IR cachechars (2);
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and
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.BR iwidth ,
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the physical width of the image in the subfont's image.
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.PP
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There are two methods to obtain a magnified view of a character from a
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subfont.
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The first is to click mouse button 1 over the image of the character in
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the subfont. The second is to select the
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.B char
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entry on the button 3 menu,
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point the resulting gunsight cursor at the desired subfont and click button 3,
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and then type at the text prompt at the bottom of the screen the
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character value, either as a multi-digit hexadecimal number or as a single
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rune representing the character.
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.PP
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To magnify a portion of other types of image files,
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click button 1 over the unmagnified file.
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The cursor will switch to a cross.
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Still with button 1, sweep a rectangle, as in
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.BR rio ,
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that encloses the portion of the image to be magnified.
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(If the file is 16×16 or smaller,
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.I tweak
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will just magnify the entire file; no sweeping is necessary.)
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.PP
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Pressing buttons 1 and 2 within magnified images changes pixel values.
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By default, button 1 sets the pixel to all zeros and button 2 sets the pixel
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to all ones.
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.PP
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Across the top of the screen is a textual display of global parameters.
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These values, as well as many of the textual values associated with
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the images, may be edited by clicking button 1 on the displayed
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value and typing a new value.
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The values along the top of the screen are:
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.TP
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.B mag
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Default magnification.
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.TP
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.B val(hex)
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The value used to modify pixels within magnified images.
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The value must be in hexadecimal, optionally preceded by a
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tilde for bitwise negation.
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.TP
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.B but1
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.TP
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.B but2
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The pixel value written when the corresponding button is pressed over a pixel.
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.TP
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.B invert-on-copy
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Whether the pixel values are inverted when a
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.B copy
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operation is performed.
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.PP
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Under button 3 is a menu holding a variety of functions.
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Many of these functions prompt for the image upon which to act
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by switching to a gunsight cursor; click button 3 over the
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selection, or click a different button to cancel the action.
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.TP
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.B open
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Read and display a file. The name of the file is typed to the prompt
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on the bottom line.
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.TP
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.B read
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Reread a file.
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.TP
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.B write
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Write a file.
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.TP
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.B copy
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Use the copy function, default
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.BR S ,
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to transfer a rectangle of pixels from one image to another.
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The program prompts with a cross cursor; sweep out a rectangle in
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one image or just click button 3 to select the whole image.
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The program will leave that rectangle in place and
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attach another one to the cursor. Move that rectangle to the desired
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place in any image and click button 3, or another button to cancel the action.
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.TP
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.B char
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As described above, open a magnified view of a character image in a subfont.
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.TP
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.B pixels
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Report the coordinate and value of individual pixels indicated by pressing button 3.
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This is a mode of operation canceled by pressing button 1 or 2.
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.TP
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.B close
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Close the specified image.
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If the image is the unmagnified file, also close any magnified views of that file.
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.TP
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.B exit
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Quit
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.IR tweak .
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The program will complain once about modified but unwritten files.
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.SH SOURCE
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.B /sys/src/cmd/tweak.c
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.SH "SEE ALSO"
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.IR cachechars (2),
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.IR image (6),
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.IR font (6)
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.SH BUGS
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For a program written to adjust width tables in fonts,
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.I tweak
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has been pushed unreasonably far.
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