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Process only once the offset and starting mask JBIG2's drawBitmap

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p01 2014-03-07 17:29:14 +01:00
parent 0bca56cbb2
commit b2b3836683
1 changed files with 8 additions and 4 deletions
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12
src/core/jbig2.js
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@ -961,11 +961,13 @@ var Jbig2Image = (function Jbig2ImageClosure() {
var combinationOperator = pageInfo.combinationOperatorOverride ? var combinationOperator = pageInfo.combinationOperatorOverride ?
regionInfo.combinationOperator : pageInfo.combinationOperator; regionInfo.combinationOperator : pageInfo.combinationOperator;
var buffer = this.buffer; var buffer = this.buffer;
var mask0 = 128 >> (regionInfo.x & 7);
var offset0 = regionInfo.y * rowSize + (regionInfo.x >> 3);
switch (combinationOperator) { switch (combinationOperator) {
case 0: // OR case 0: // OR
for (var i = 0; i < height; i++) { for (var i = 0; i < height; i++) {
var mask = 128 >> (regionInfo.x & 7); var mask = mask0;
var offset = (i + regionInfo.y) * rowSize + (regionInfo.x >> 3); var offset = offset0;
for (var j = 0; j < width; j++) { for (var j = 0; j < width; j++) {
if (bitmap[i][j]) { if (bitmap[i][j]) {
buffer[offset] |= mask; buffer[offset] |= mask;
@ -976,12 +978,13 @@ var Jbig2Image = (function Jbig2ImageClosure() {
offset++; offset++;
} }
} }
offset0 += rowSize;
} }
break; break;
case 2: // XOR case 2: // XOR
for (var i = 0; i < height; i++) { for (var i = 0; i < height; i++) {
var mask = 128 >> (regionInfo.x & 7); var mask = mask0;
var offset = (i + regionInfo.y) * rowSize + (regionInfo.x >> 3); var offset = offset0;
for (var j = 0; j < width; j++) { for (var j = 0; j < width; j++) {
if (bitmap[i][j]) { if (bitmap[i][j]) {
buffer[offset] ^= mask; buffer[offset] ^= mask;
@ -992,6 +995,7 @@ var Jbig2Image = (function Jbig2ImageClosure() {
offset++; offset++;
} }
} }
offset0 += rowSize;
} }
break; break;
default: default: