ttweak.1 - plan9port - [fork] Plan 9 from user space
HTML git clone git://src.adamsgaard.dk/plan9port
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ttweak.1 (4771B)
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1 .TH TWEAK 1
2 .CT 1 graphics
3 .SH NAME
4 tweak \- edit image files, subfont files, face files, etc.
5 .SH SYNOPSIS
6 .B tweak
7 [
8 .I file ...
9 ]
10 .SH DESCRIPTION
11 .I Tweak
12 edits existing files holding various forms of images.
13 To create original images, start from an existing image, subfont, etc.
14 .PP
15 .I Tweak
16 reads its argument
17 .I files
18 and displays the resulting images in a vertical column.
19 If the image is too wide to fit across the display, it
20 is folded much like a long line of text in an
21 .IR rio
22 window.
23 Under each image is displayed one or two lines of text
24 presenting its parameters.
25 The first line shows the image's
26 .BR depth ,
27 the number
28 of bits per pixel;
29 .BR r ,
30 the rectangle covered by the image;
31 and the name of the
32 .B file
33 from which it was read.
34 If the file is a subfont, a second line presents a hexadecimal 16-bit
35 .B offset
36 to be applied to character values from the subfont
37 (typically as stored in a font file; see
38 .MR font (7) );
39 and the subfont's
40 .BR n ,
41 .BR height ,
42 and
43 .B ascent
44 as defined in
45 .MR cachechars (3) .
46 .PP
47 By means described below, magnified views of portions of the images
48 may be displayed.
49 The text associated with such a view includes
50 .BR mag ,
51 the magnification.
52 If the view is of a single character from a subfont, the second
53 line of text shows the character's value (including the subfont's offset)
54 in hexadecimal and as a character in
55 .I tweak's
56 default font; the character's
57 .BR x ,
58 .BR top ,
59 .BR bottom ,
60 .BR left ,
61 and
62 .BR width
63 as defined in
64 .MR cachechars (3) ;
65 and
66 .BR iwidth ,
67 the physical width of the image in the subfont's image.
68 .PP
69 There are two methods to obtain a magnified view of a character from a
70 subfont.
71 The first is to click mouse button 1 over the image of the character in
72 the subfont. The second is to select the
73 .B char
74 entry on the button 3 menu,
75 point the resulting gunsight cursor at the desired subfont and click button 3,
76 and then type at the text prompt at the bottom of the screen the
77 character value, either as a multi-digit hexadecimal number or as a single
78 rune representing the character.
79 .PP
80 To magnify a portion of other types of image files,
81 click button 1 over the unmagnified file.
82 The cursor will switch to a cross.
83 Still with button 1, sweep a rectangle, as in
84 .BR rio ,
85 that encloses the portion of the image to be magnified.
86 (If the file is 16×16 or smaller,
87 .I tweak
88 will just magnify the entire file; no sweeping is necessary.)
89 .PP
90 Pressing buttons 1 and 2 within magnified images changes pixel values.
91 By default, button 1 sets the pixel to all zeros and button 2 sets the pixel
92 to all ones.
93 .PP
94 Across the top of the screen is a textual display of global parameters.
95 These values, as well as many of the textual values associated with
96 the images, may be edited by clicking button 1 on the displayed
97 value and typing a new value.
98 The values along the top of the screen are:
99 .TP
100 .B mag
101 Default magnification.
102 .TP
103 .B val(hex)
104 The value used to modify pixels within magnified images.
105 The value must be in hexadecimal, optionally preceded by a
106 tilde for bitwise negation.
107 .TP
108 .B but1
109 .TP
110 .B but2
111 The pixel value written when the corresponding button is pressed over a pixel.
112 .TP
113 .B invert-on-copy
114 Whether the pixel values are inverted when a
115 .B copy
116 operation is performed.
117 .PP
118 Under button 3 is a menu holding a variety of functions.
119 Many of these functions prompt for the image upon which to act
120 by switching to a gunsight cursor; click button 3 over the
121 selection, or click a different button to cancel the action.
122 .TP
123 .B open
124 Read and display a file. The name of the file is typed to the prompt
125 on the bottom line.
126 .TP
127 .B read
128 Reread a file.
129 .TP
130 .B write
131 Write a file.
132 .TP
133 .B copy
134 Use the copy function, default
135 .BR S ,
136 to transfer a rectangle of pixels from one image to another.
137 The program prompts with a cross cursor; sweep out a rectangle in
138 one image or just click button 3 to select the whole image.
139 The program will leave that rectangle in place and
140 attach another one to the cursor. Move that rectangle to the desired
141 place in any image and click button 3, or another button to cancel the action.
142 .TP
143 .B char
144 As described above, open a magnified view of a character image in a subfont.
145 .TP
146 .B pixels
147 Report the coordinate and value of individual pixels indicated by pressing button 3.
148 This is a mode of operation canceled by pressing button 1 or 2.
149 .TP
150 .B close
151 Close the specified image.
152 If the image is the unmagnified file, also close any magnified views of that file.
153 .TP
154 .B exit
155 Quit
156 .IR tweak .
157 The program will complain once about modified but unwritten files.
158 .SH SOURCE
159 .B \*9/src/cmd/draw/tweak.c
160 .SH "SEE ALSO"
161 .MR cachechars (3) ,
162 .MR image (7) ,
163 .MR font (7)
164 .SH BUGS
165 For a program written to adjust width tables in fonts,
166 .I tweak
167 has been pushed unreasonably far.