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Performance upgrade: %75 less parse time #16

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Performance upgrade: %75 less parse time #16

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20 changes: 12 additions & 8 deletions tiff.js
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Original file line number Diff line number Diff line change
Expand Up @@ -563,11 +563,11 @@ TIFFParser.prototype = {

if (canvas.getContext) {
var ctx = this.canvas.getContext("2d");

// Set a default fill style.
ctx.fillStyle = this.makeRGBAFillValue(255, 255, 255, 0);

// If RowsPerStrip is missing, the whole image is in one strip.
var imageData = ctx.getImageData(0, 0, this.canvas.width, this.canvas.height);
var pixels = imageData.data;
var stride = this.canvas.width * 4;
// If RowsPerStrip is missing, the whole image is in one strip.
if (fileDirectory.RowsPerStrip) {
var rowsPerStrip = fileDirectory.RowsPerStrip.values[0];
} else {
Expand Down Expand Up @@ -622,7 +622,7 @@ TIFFParser.prototype = {
for (var k = 0; k < numExtraSamples; k++) {
if (extraSamplesValues[k] === 1 || extraSamplesValues[k] === 2) {
// Clamp opacity to the range [0,1].
opacity = pixelSamples[3 + k] / 256;
opacity = pixelSamples[3 + k];

break;
}
Expand Down Expand Up @@ -692,13 +692,17 @@ TIFFParser.prototype = {
break;
}

ctx.fillStyle = this.makeRGBAFillValue(red, green, blue, opacity);
ctx.fillRect(x, yPadding + y, 1, 1);
var pindex = 4 * x + (yPadding + y) * stride;
pixels[pindex] = red;
pixels[pindex + 1] = green;
pixels[pindex + 2] = blue;
pixels[pindex + 3] = opacity;
}
}

numRowsInPreviousStrip = numRowsInStrip;
}
ctx.putImageData(imageData, 0, 0);
}

/* for (var i = 0, numFileDirectories = this.fileDirectories.length; i < numFileDirectories; i++) {
Expand Down