From: Pranav Batra <batrapranav@chromium.org>

In unpackBits() round width down instead of up and
separately handle the remaining bits (b/217983652).

Corresponding change in ChromeOS: https://crrev.com/c/3451049

--- a/prnt/hpcups/Job.cpp
+++ b/prnt/hpcups/Job.cpp
@@ -148,7 +148,7 @@ void Job::unpackBits(BYTE *BlackImageData)
 {
 // Convert K from 1-bit raster to 8-bit raster.
     unsigned char  bitflag[] = {0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01};
-    int    width = (m_job_attributes.media_attributes.printable_width + 7) / 8;
+    int    width = m_job_attributes.media_attributes.printable_width / 8;
     for (int i = 0; i < width; i++)
     {
         for (int j = 0; j < 8; j++)
@@ -157,6 +157,12 @@ void Job::unpackBits(BYTE *BlackImageData)
                 m_pBlackRaster[i*8+j] = 1;
         }
     }
+    int bits = m_job_attributes.media_attributes.printable_width % 8;
+    for (int j = 0; j < bits; j++)
+    {
+        if (BlackImageData[width] & bitflag[j])
+            m_pBlackRaster[width*8+j] = 1;
+    }
 }
 
 DRIVER_ERROR Job::SendRasters(BYTE* BlackImageData, BYTE* ColorImageData)