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Add support for synchronous decode #29

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Add support for synchronous decode #29

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26 changes: 16 additions & 10 deletions png-node.coffee
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Original file line number Diff line number Diff line change
Expand Up @@ -132,11 +132,9 @@ module.exports = class PNG
b1 = @data[@pos++] << 8
b2 = @data[@pos++]
b1 | b2

decodePixels: (fn) ->
zlib.inflate @imgData, (err, data) =>
throw err if err


decodePixels: (fn, sync) ->
worker = (data) =>
pixelBytes = @pixelBitlength / 8
scanlineLength = pixelBytes * @width

Expand Down Expand Up @@ -205,7 +203,14 @@ module.exports = class PNG
row++

fn pixels


if sync
worker (zlib.inflateSync @imgData)
else
zlib.inflate @imgData, (err, data) =>
throw err if err
worker data

decodePalette: ->
palette = @palette
transparency = @transparency.indexed or []
Expand Down Expand Up @@ -256,9 +261,10 @@ module.exports = class PNG
j = k

return
decode: (fn) ->

decode: (fn, sync) ->
ret = new Buffer(@width * @height * 4)
@decodePixels (pixels) =>
worker = (pixels) =>
@copyToImageData ret, pixels
fn ret
fn ret
@decodePixels worker, sync
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