Sakurai/pdf.js
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Implements ImageMask: using image as a stencil mask

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notmasteryet 2011-08-20 14:41:38 -05:00
parent dab62f9a1e
commit 9bc76da676
1 changed files with 37 additions and 7 deletions
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44
pdf.js
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@ -4889,7 +4889,10 @@ var CanvasGraphics = (function() {
var imgData = tmpCtx.getImageData(0, 0, w, h);
var pixels = imgData.data;
imageObj.fillRgbaBuffer(pixels);
if (imageObj.imageMask)
imageObj.fillUsingStencilMask(pixels, this.current.fillColor);
else
imageObj.fillRgbaBuffer(pixels);
tmpCtx.putImageData(imgData, 0, 0);
ctx.drawImage(tmpCanvas, 0, -h);
@ -5660,14 +5663,16 @@ var PDFImage = (function() {
}
this.bpc = bitsPerComponent;
var colorSpace = dict.get('ColorSpace', 'CS');
if (!colorSpace) {
TODO('JPX images (which don"t require color spaces');
colorSpace = new Name('DeviceRGB');
if (!this.imageMask) {
var colorSpace = dict.get('ColorSpace', 'CS');
if (!colorSpace) {
TODO('JPX images (which don"t require color spaces');
colorSpace = new Name('DeviceRGB');
}
this.colorSpace = ColorSpace.parse(colorSpace, xref, res);
this.numComps = this.colorSpace.numComps;
}
this.colorSpace = ColorSpace.parse(colorSpace, xref, res);
this.numComps = this.colorSpace.numComps;
this.decode = dict.get('Decode', 'D');
var mask = xref.fetchIfRef(image.dict.get('Mask'));
@ -5763,6 +5768,31 @@ var PDFImage = (function() {
}
return buf;
},
fillUsingStencilMask: function fillUsingStencilMask(buffer, cssRgb) {
var m = /rgb\((\d+),(\d+),(\d+)\)/.exec(cssRgb); // parse CSS color
var r = m[1] | 0, g = m[2] | 0, b = m[3] | 0;
var width = this.width;
var height = this.height;
var imgArray = this.image.getBytes((height * width + 7) >> 3);
var i, j, mask;
var bufferPos = 0, imgArrayPos = 0;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
var buf = imgArray[imgArrayPos++];
for (mask = 128; mask > 0; mask >>= 1) {
if (buf & mask) {
buffer[bufferPos++] = r;
buffer[bufferPos++] = g;
buffer[bufferPos++] = b;
buffer[bufferPos++] = 255;
} else {
buffer[bufferPos + 3] = 0;
bufferPos += 4;
}
}
}
}
},
fillRgbaBuffer: function fillRgbaBuffer(buffer) {
var numComps = this.numComps;
var width = this.width;