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indexing for graphical file types

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svn: r9026
This commit is contained in:
John Clements 2008-03-19 15:51:03 +00:00
parent b26702358a
commit d154490c35
1 changed files with 14 additions and 15 deletions
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29
collects/scribblings/gui/bitmap-class.scrbl
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@ -54,10 +54,9 @@ When a @scheme[bits] byte string is provided: Creates a monochrome
[alpha? any/c @scheme[#f]]) [alpha? any/c @scheme[#f]])
void?]{ void?]{
Produces the same result as @xmethod[bitmap-dc% get-pixel] with the Produces the same result as @xmethod[bitmap-dc% get-argb-pixels], but the
bitmap selected into the DC, but the bitmap does not have to be bitmap does not have to be selected into the DC (and this method works even if
selected anywhere (and this method works even if the bitmap is the bitmap is selected into another DC, attached as a button label, etc.).
selected into another DC, attached as a button label, etc.).
} }
@ -102,7 +101,7 @@ When a PNG file is loaded with @scheme['png/mask] or
values, the mask bitmap is monochrome, otherwise it is grayscale values, the mask bitmap is monochrome, otherwise it is grayscale
(representing the alpha channel inverted). (representing the alpha channel inverted).
The mast bitmap is @italic{not} used automatically by drawing The mask bitmap is @italic{not} used automatically by drawing
routines. The mask bitmap can be extracted and supplied explicitly as routines. The mask bitmap can be extracted and supplied explicitly as
a mask (e.g., as the sixth argument to @method[dc<%> a mask (e.g., as the sixth argument to @method[dc<%>
draw-bitmap]). The mask bitmap is used by @method[bitmap% save-file] draw-bitmap]). The mask bitmap is used by @method[bitmap% save-file]
@ -144,15 +143,15 @@ The @scheme[kind] argument specifies the file's format:
@itemize{ @itemize{
@item{@scheme['unknown] --- examine the file to determine its format} @item{@scheme['unknown] --- examine the file to determine its format}
@item{@scheme['unknown/mask] --- like @scheme['unknown], but see @method[bitmap% get-loaded-mask]} @item{@scheme['unknown/mask] --- like @scheme['unknown], but see @method[bitmap% get-loaded-mask]}
@item{@scheme['gif] --- load a GIF bitmap file (X, Windows, Mac OS X)} @item{@scheme['gif] --- load a @as-index{GIF} bitmap file (X, Windows, Mac OS X)}
@item{@scheme['gif/mask] --- like @scheme['gif], but see @method[bitmap% get-loaded-mask] (X, Windows, Mac OS X)} @item{@scheme['gif/mask] --- like @scheme['gif], but see @method[bitmap% get-loaded-mask] (X, Windows, Mac OS X)}
@item{@scheme['jpeg] --- load a JPEG bitmap file (X, Windows, Mac OS X)} @item{@scheme['jpeg] --- load a @as-index{JPEG} bitmap file (X, Windows, Mac OS X)}
@item{@scheme['png] --- load a PNG bitmap file (X, Windows, Mac OS X)} @item{@scheme['png] --- load a @as-index{PNG} bitmap file (X, Windows, Mac OS X)}
@item{@scheme['png/mask] --- like @scheme['png], but see @method[bitmap% get-loaded-mask] (X, Windows, Mac OS X)} @item{@scheme['png/mask] --- like @scheme['png], but see @method[bitmap% get-loaded-mask] (X, Windows, Mac OS X)}
@item{@scheme['xbm] --- load an X bitmap file (X, Windows, Mac OS X); creates a monochrome bitmap} @item{@scheme['xbm] --- load an X bitmap (@as-index{XBM}) file (X, Windows, Mac OS X); creates a monochrome bitmap}
@item{@scheme['xpm] --- load an XPM bitmap file (X, Windows, Mac OS X)} @item{@scheme['xpm] --- load an @as-index{XPM} bitmap file (X, Windows, Mac OS X)}
@item{@scheme['bmp] --- load a Windows bitmap file (X, Windows, Mac OS X)} @item{@scheme['bmp] --- load a Windows bitmap file (X, Windows, Mac OS X)}
@item{@scheme['pict] --- load a PICT bitmap file (Mac OS X)} @item{@scheme['pict] --- load a @as-index{PICT} bitmap file (Mac OS X)}
} }
An XBM image is always loaded as a monochrome bitmap. A 1-bit An XBM image is always loaded as a monochrome bitmap. A 1-bit
@ -201,13 +200,13 @@ The @scheme[kind] argument determined the type of file that is created,
@itemize{ @itemize{
@item{@scheme['png] --- save a PNG file (X, Windows, Mac OS X)} @item{@scheme['png] --- save a @as-index{PNG} file (X, Windows, Mac OS X)}
@item{@scheme['jpeg] --- save a JPEG file (X, Windows, Mac OS X)} @item{@scheme['jpeg] --- save a @as-index{JPEG} file (X, Windows, Mac OS X)}
@item{@scheme['xbm] --- save an X bitmap file (X, Windows, Mac OS X)} @item{@scheme['xbm] --- save an X bitmap (@as-index{XBM}) file (X, Windows, Mac OS X)}
@item{@scheme['xpm] --- save an XPM bitmap file (X, Windows, Mac OS X)} @item{@scheme['xpm] --- save an @as-index{XPM} bitmap file (X, Windows, Mac OS X)}
@item{@scheme['bmp] --- save a Windows bitmap file (Windows)} @item{@scheme['bmp] --- save a Windows bitmap file (Windows)}