From 54c16118012845c63f4d67e9cbb7e095232cf219 Mon Sep 17 00:00:00 2001
From: Bojan Markovic <bmarkovic.79@gmail.com>
Date: Wed, 1 Jan 2014 13:14:19 +0100
Subject: [PATCH] Added bitmap size and clipping to rasterize.js

Added support for defining window/viewport size and eventual clipping to bitmap rasterization similar to how it is used with paper output.
---
 examples/rasterize.js | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/examples/rasterize.js b/examples/rasterize.js
index 165bcfa7c..17b7d89dc 100644
--- a/examples/rasterize.js
+++ b/examples/rasterize.js
@@ -5,6 +5,8 @@ var page = require('webpage').create(),
 if (system.args.length < 3 || system.args.length > 5) {
     console.log('Usage: rasterize.js URL filename [paperwidth*paperheight|paperformat] [zoom]');
     console.log('  paper (pdf output) examples: "5in*7.5in", "10cm*20cm", "A4", "Letter"');
+    console.log('  image (png/jpg output) examples: "1920px" entire page, window width 1920px');
+    console.log('                                   "800px*600px" window, clipped to 800x600');
     phantom.exit(1);
 } else {
     address = system.args[1];
@@ -14,6 +16,20 @@ if (system.args.length < 3 || system.args.length > 5) {
         size = system.args[3].split('*');
         page.paperSize = size.length === 2 ? { width: size[0], height: size[1], margin: '0px' }
                                            : { format: system.args[3], orientation: 'portrait', margin: '1cm' };
+    } else if (system.args.length > 3 && system.args[3].substr(-2) === "px") {
+        size = system.args[3].split('*');
+        if (size.length === 2) {
+            pageWidth = parseInt(size[0], 10);
+            pageHeight = parseInt(size[1], 10);
+            page.viewportSize = { width: pageWidth, height: pageHeight };
+            page.clipRect = { top: 0, left: 0, width: pageWidth, height: pageHeight };
+        } else {
+            console.log("size:", system.args[3]);
+            pageWidth = parseInt(system.args[3], 10);
+            pageHeight = parseInt(pageWidth * 3/4, 10); // it's as good an assumption as any
+            console.log ("pageHeight:",pageHeight);
+            page.viewportSize = { width: pageWidth, height: pageHeight };
+        }
     }
     if (system.args.length > 4) {
         page.zoomFactor = system.args[4];