Disable rendering on up-scale.

remoting/base/decoder_vp8.cc

Index: remoting/base/decoder_vp8.cc
diff --git a/remoting/base/decoder_vp8.cc b/remoting/base/decoder_vp8.cc
index 88ea3b6afa0f733495108904053d5474fbf16936..2c0677b053e42322f586ee73870d8b21b33a2051 100644
--- a/remoting/base/decoder_vp8.cc
+++ b/remoting/base/decoder_vp8.cc
@@ -121,6 +121,14 @@ void DecoderVp8::RenderFrame(const SkISize& view_size,
                              SkRegion* output_region) {
   SkIRect source_clip = SkIRect::MakeWH(last_image_->d_w, last_image_->d_h);
 
+  // ScaleYUVToRGB32WithRect doesn't support up-scaling, and our web-app never
+  // intentionally up-scales, so if we see up-scaling (e.g. during host resize
+  // or if the user applies page zoom) just don't render anything.
+  // TODO(wez): Remove this hack when ScaleYUVToRGB32WithRect can up-scale.
+  if (source_clip.width() < view_size.width() ||
+      source_clip.height() < view_size.height())
+    return;

[alexeypa (please no reviews), 2012/03/02 19:59:04]

I guess we should make the same check in DecoderRowBased::RenderFrame().
RectangleUpdateDecoder::DoPaint() is not good, since technically we can have a
mixture of working and broken codecs.

[Sergey Ulanov, 2012/03/02 20:03:27]

Need {} around this line (multi-line condition)

[Wez, 2012/03/02 22:15:31]

Done.

[Wez, 2012/03/02 22:15:31]

DecoderRowBased currently doesn't support scaling at all, so I wonder how it
behaves in those cases?

+
   for (SkRegion::Iterator i(updated_region_); !i.done(); i.next()) {
     // Determine the scaled area affected by this rectangle changing.
     SkIRect rect = i.rect();