png/writer

src/png/writer.tur

defn

png-write

(png-write [path :cstr img :int] :ptr<void>)

write an image handle to a PNG file on disk.

Parameters

path		destination filesystem path for the PNG file
img		image handle (ok-val from png-read in png/reader)

Returns

(ok 0) on success; (err 0) on failure.

Example

(let [r (png-write "/tmp/out.png" img)]
    (if (ok? r) (println "written") (println "write failed")))

Since: PN0

defn

(png-write-raw [path :cstr pixels :cstr width :int height :int channels :int bit-depth :int] :ptr<void>)

write raw pixel data to a PNG file on disk.

Parameters

path		destination filesystem path for the PNG file
pixels		pointer to pixel data as :cstr (row-major interleaved bytes)
width		image width in pixels
height		image height in pixels
channels		number of channels: 1=GRAY, 2=GRAY_ALPHA, 3=RGB, 4=RGBA
bit-depth		bit depth per channel (typically 8)

Returns

(ok 0) on success; (err 0) on failure.

Example

(let [r (png-write-raw "/tmp/out.png" buf 256 256 4 8)]
    (if (ok? r) (println "written") (println "write failed")))

Since: PN0

Internal definitions

__ok-- create an ok result wrapping integer value v.

__err-- create an err result wrapping integer error value e.