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doc clarification for make-argb

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John Clements 2012-05-08 12:00:34 -07:00
parent a8994c7261
commit 0196a6f97a
1 changed files with 10 additions and 5 deletions
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15
collects/mrlib/scribblings/cache-image-snip.scrbl
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@ -112,14 +112,19 @@ This snipclass is used for saved cache image snips.}
[height exact-nonnegative-integer?]) [height exact-nonnegative-integer?])
argb?]{ argb?]{
Constructs a new argb value. The vector has four entries Constructs a new argb value with the given width and height,
for each pixel, an alpha, red, green, and blue value. The using the data in the vector. The vector has four entries
int specifies the width of the image; the height is the for each pixel, an alpha, red, green, and blue value.
size of the vector, divided by 4, divided by the width.} The pixels are specified in row-major order, so that the
pixel at location (x,y) comes from vector entry (4*(x+(width*y))).
}
@defproc[(argb-vector [argb argb?]) (vectorof (integer-in 0 255))]{ @defproc[(argb-vector [argb argb?]) (vectorof (integer-in 0 255))]{
Extracts the vector from @racket[argb].} Extracts the vector from @racket[argb]. The resulting vector
has entries in row-major order, so that the data for the pixel
at (x,y) winds up in four vector entries beginning at
(4*(x+(width*y))).}
@defproc[(argb-width [argb argb?]) exact-nonnegative-integer?]{ @defproc[(argb-width [argb argb?]) exact-nonnegative-integer?]{