Created
December 7, 2013 17:30
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webp support using libwebpjs (webp->png in canvas)
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WebPDecodeAndDraw = function (data) { | |
var decoder = new WebPDecoder(); | |
var bitmap = decoder.WebPDecode(data, data.length); | |
if (bitmap) { | |
//Draw Image | |
var output = ctx.createImageData(canvas.width, canvas.height); | |
var biWidth = canvas.width; | |
var outputData = output.data; | |
for (var h=0;h<canvas.height;h++) { | |
for (var w=0;w<canvas.width;w++) { | |
outputData[0+w*4+(biWidth*4)*h] = bitmap[0+w*4+(biWidth*4)*h]; | |
outputData[1+w*4+(biWidth*4)*h] = bitmap[1+w*4+(biWidth*4)*h]; | |
outputData[2+w*4+(biWidth*4)*h] = bitmap[2+w*4+(biWidth*4)*h]; | |
outputData[3+w*4+(biWidth*4)*h] = bitmap[3+w*4+(biWidth*4)*h]; | |
}; | |
} | |
ctx.putImageData(output, 0, 0); | |
var dataURL = canvas.toDataURL("image/png"); | |
document.getElementById("dec").src=dataURL; | |
} | |
}; | |
function getImage(img) { | |
// Create an empty canvas element | |
canvas = document.createElement("canvas"); | |
canvas.width = img.width; | |
canvas.height = img.height; | |
// Copy the image contents to the canvas | |
ctx = canvas.getContext("2d"); | |
ctx.drawImage(img, 0, 0); | |
WebPDecodeAndDraw(ctx.getImageData(0,0,ctx.canvas.width,ctx.canvas.height)['data']); | |
} |
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