Bug 1787706 - Increase the blob tile size to 512. r=jrmuizel

It improves rasterization and upload times by a lot in almost all of the test cases I can find. The only drawback is that our invalidation granulatiry is the tile so invalidation gets coarser as we increase the tile size.

512 is a bit special because it is the limit above which a different texture upload path is taken, so there will be more risk of performance side effects if/when we decide to make tiles even larger.

Differential Revision: https://phabricator.services.mozilla.com/D155822

gfx/thebes/gfxPlatform.cpp

@@ -590,7 +590,7 @@ static void WebRenderBatchingPrefChangeCallback(const char* aPrefName, void*) {
 static void WebRenderBlobTileSizePrefChangeCallback(const char* aPrefName,
                                                     void*) {
   uint32_t tileSize = Preferences::GetUint(
-      StaticPrefs::GetPrefName_gfx_webrender_blob_tile_size(), 256);
+      StaticPrefs::GetPrefName_gfx_webrender_blob_tile_size(), 512);
   gfx::gfxVars::SetWebRenderBlobTileSize(tileSize);
 }
 

layout/reftests/svg/filters/reftest.list

@@ -107,7 +107,7 @@ fuzzy(0-1,0-400) == feDisplacementMap-alpha-01.svg pass.svg
 fuzzy(0-2,0-500) == feDisplacementMap-colour-01.svg feDisplacementMap-colour-01-ref.svg
 == feDisplacementMap-scale-01.svg pass.svg
 
-fuzzy-if(/^Windows\x20NT\x2010\.0/.test(http.oscpu),0-2,0-25) fuzzy-if(!useDrawSnapshot,55-98,14033-16360) == feDropShadow-01.svg feDropShadow-01-ref.svg
+fuzzy-if(/^Windows\x20NT\x2010\.0/.test(http.oscpu),0-2,0-25) fuzzy-if(!useDrawSnapshot,40-98,14033-16360) == feDropShadow-01.svg feDropShadow-01-ref.svg
 
 == feFlood-color-01.svg pass.svg
 

modules/libpref/init/StaticPrefList.yaml

@@ -6110,7 +6110,7 @@
 
 - name: gfx.webrender.blob-tile-size
   type: uint32_t
-  value: 256
+  value: 512
   mirror: always
 
 - name: gfx.webrender.batched-upload-threshold