From 9bc76da676c3e74459647299995d4460ef7fe4d8 Mon Sep 17 00:00:00 2001
From: notmasteryet <async.processingjs@yahoo.com>
Date: Sat, 20 Aug 2011 14:41:38 -0500
Subject: [PATCH] Implements ImageMask: using image as a stencil mask
---
pdf.js | 44 +++++++++++++++++++++++++++++++++++++-------
1 file changed, 37 insertions(+), 7 deletions(-)
diff --git a/pdf.js b/pdf.js
index 642e37d32..325aa16d8 100644
--- a/pdf.js
+++ b/pdf.js
@@ -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;