RFR: 8275345: RasterFormatException when drawing a tiled image made of non-writable rasters [v2]

[Martin Desruisseaux]

> This commit fixes a `RasterFormatException` thrown when `Graphics2D.drawRenderedImage(…)` is invoked with an image containing tiles that are instances of `Raster` but not `WritableRaster`.
> 
> https://bugs.openjdk.java.net/browse/JDK-8275345

Martin Desruisseaux has updated the pull request incrementally with one additional commit since the last revision:

  Add jtreg @test, @bug and @summary tags. Remove HTML <pre> tags. Edit comments.

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7337/files
  - new: https://git.openjdk.java.net/jdk/pull/7337/files/c3db2978..fea2f9c0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7337&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7337&range=00-01

  Stats: 33 lines in 1 file changed: 27 ins; 3 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7337.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7337/head:pull/7337

PR: https://git.openjdk.java.net/jdk/pull/7337