Sakurai/pdf.js
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read in image data en-block instead of sucking it through the stream interface

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Andreas Gal 2011-06-08 07:50:35 -07:00
parent 5c5d09c898
commit ee5d8763e8
1 changed files with 38 additions and 11 deletions
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45
pdf.js
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@ -78,6 +78,15 @@ var Stream = (function() {
this.pos++;
return ch;
},
snarf: function(dest) {
var bytes = this.bytes;
var pos = this.pos;
var end = this.end;
var n = 0;
while (pos < end)
dest[n++] = bytes[pos++];
this.pos = this.end;
},
skip: function(n) {
if (!n)
n = 1;
@ -308,6 +317,20 @@ var FlateStream = (function() {
this.bufferPos++;
return ch;
},
snarf: function(dest) {
// copy the leftover data in the buffer into dest
var bufferLength = this.bufferLength;
var bufferPos = this.bufferPos;
var n = 0;
while (bufferPos < bufferLength)
dest[n++] = this.buffer[bufferPos++];
// now use dest as our buffer and fill it
this.buffer = dest;
while (!this.eof)
this.readBlock();
// update stream position
this.pos = n;
},
skip: function(n) {
if (!n)
n = 1;
@ -1928,6 +1951,9 @@ var CanvasGraphics = (function() {
var imgData = tmpCtx.getImageData(0, 0, w, h);
var pixels = imgData.data;
// Read in image data
image.snarf(pixels);
var alpha = 25;
if (image.dict.has("SMask")) {
var smask = image.dict.get("SMask");
@ -1951,18 +1977,19 @@ var CanvasGraphics = (function() {
TODO(matte);
}
for (var i = 0; i < 4 * w * h; ++i) {
pixels[i] = image.getChar() * smask.getChar() / max;
}
// read in mask data
var mask = new Uint8Array(4 * w * h);
smask.snarf(mask);
// and blend images with it
var stop = 4 * w * h;
for (var i = 0; i < stop; ++i)
pixels[i] = pixels[i] * mask[i] / max;
} else {
for (var i = 0; i < 4 * w * h; ++i) {
// TODO blend if SMask is a mask image
if (3 === i % 4) {
var stop = 4 * w * h;
for (var i = 3; i < stop; i += 4)
pixels[i] = alpha;
} else {
pixels[i] = image.getChar();
}
}
}
tmpCtx.putImageData(imgData, 0, 0);