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Implemented basic version of smask

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sbarman 2011-06-06 16:40:03 -07:00
parent 27b8b68b87
commit 99aacfe42c
1 changed files with 29 additions and 7 deletions
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36
pdf.js
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@ -1926,17 +1926,39 @@ var CanvasGraphics = (function() {
var pixels = imgData.data;
var alpha = 25;
if (image.dict.has("SMask"))
if (image.dict.has("SMask")) {
var smask = image.dict.get("SMask");
smask = this.xref.fetchIfRef(smask);
// Specifies either a shape or opacity mask to be
// applied to the image samples
TODO("SMask");
}
for (var i = 0; i < 4 * w * h; ++i) {
// TODO blend if SMask is a mask image
if (3 === i % 4) {
pixels[i] = alpha;
} else {
pixels[i] = image.getChar();
if (smask) {
var smaskDict = smask.dict;
if (!smaskDict)
error("No dictionary for smask");
var smaskBitsPerComponent = smaskDict.get("BitsPerComponent") || smaskDict.get("BPC");
if (!smaskBitsPerComponent)
error("Bad BPC for smask");
var max = (1 << bitsPerComponent) - 1;
var matte = smaskDict.get("Matte");
if (matte) {
TODO(matte);
}
for (var i = 0; i < 4 * w * h; ++i) {
pixels[i] = image.getChar() * smask.getChar() / max;
}
} else {
for (var i = 0; i < 4 * w * h; ++i) {
// TODO blend if SMask is a mask image
if (3 === i % 4) {
pixels[i] = alpha;
} else {
pixels[i] = image.getChar();
}
}
}
tmpCtx.putImageData(imgData, 0, 0);