Revert of Add device space "nudge" to gpu draws (patchset #6 id:90001 of https://codereview.chromium.org/877473005/)

Reason for revert:
Blink layout tests this time :(

Original issue's description:
> Add device space "nudge" to gpu draws
>
> This CL nudges all the GPU draws and clips slightly to match raster's round behavior for BW draws. We assume the effect will be negligible and do it for AA draws too.
>
> BUG=423834
>
> Committed: https://skia.googlesource.com/skia/+/2d55d07501c56310f97d2092d789a2bc9fa01b78
>
> Committed: https://skia.googlesource.com/skia/+/b9329991426d0b77ea194a380d72d73fb855308a

TBR=bsalomon@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=423834

Review URL: https://codereview.chromium.org/886153002

1 files changed, 7 insertions, 16 deletions

diff --git a/src/gpu/effects/GrConvexPolyEffect.cpp b/src/gpu/effects/GrConvexPolyEffect.cpp
index 615c341ef2..7035094fa6 100644
--- a/src/gpu/effects/GrConvexPolyEffect.cpp
+++ b/src/gpu/effects/GrConvexPolyEffect.cpp
@@ -137,14 +137,10 @@ void GLAARectEffect::emitCode(GrGLFPBuilder* builder,
         fsBuilder->codeAppendf("\t\tfloat alpha = (1.0 + max(xSub, -1.0)) * (1.0 + max(ySub, -1.0));\n");
     } else {
         fsBuilder->codeAppendf("\t\tfloat alpha = 1.0;\n");
-        fsBuilder->codeAppendf("\t\talpha *= (%s.x - %s.x) > -0.5 ? 1.0 : 0.0;\n",
-                               fragmentPos, rectName);
-        fsBuilder->codeAppendf("\t\talpha *= (%s.z - %s.x) > -0.5 ? 1.0 : 0.0;\n",
-                               rectName, fragmentPos);
-        fsBuilder->codeAppendf("\t\talpha *= (%s.y - %s.y) > -0.5 ? 1.0 : 0.0;\n",
-                               fragmentPos, rectName);
-        fsBuilder->codeAppendf("\t\talpha *= (%s.w - %s.y) > -0.5 ? 1.0 : 0.0;\n",
-                               rectName, fragmentPos);
+        fsBuilder->codeAppendf("\t\talpha *= (%s.x - %s.x) > -0.5 ? 1.0 : 0.0;\n", fragmentPos, rectName);
+        fsBuilder->codeAppendf("\t\talpha *= (%s.z - %s.x) > -0.5 ? 1.0 : 0.0;\n", rectName, fragmentPos);
+        fsBuilder->codeAppendf("\t\talpha *= (%s.y - %s.y) > -0.5 ? 1.0 : 0.0;\n", fragmentPos, rectName);
+        fsBuilder->codeAppendf("\t\talpha *= (%s.w - %s.y) > -0.5 ? 1.0 : 0.0;\n", rectName, fragmentPos);
     }
 
     if (GrProcessorEdgeTypeIsInverseFill(aare.getEdgeType())) {
@@ -158,10 +154,8 @@ void GLAARectEffect::setData(const GrGLProgramDataManager& pdman, const GrProces
     const AARectEffect& aare = processor.cast<AARectEffect>();
     const SkRect& rect = aare.getRect();
     if (rect != fPrevRect) {
-        // Add a device space "nudge" of 0.05f, 0.05f to match raster's rounding behavior for
-        // BW clipping/drawing
-        pdman.set4f(fRectUniform, rect.fLeft + 0.55f, rect.fTop + 0.55f,
-                                  rect.fRight - 0.45f, rect.fBottom - 0.45f);
+        pdman.set4f(fRectUniform, rect.fLeft + 0.5f, rect.fTop + 0.5f,
+                   rect.fRight - 0.5f, rect.fBottom - 0.5f);
         fPrevRect = rect;
     }
 }
@@ -227,10 +221,7 @@ void GrGLConvexPolyEffect::emitCode(GrGLFPBuilder* builder,
     fsBuilder->codeAppend("\t\tfloat edge;\n");
     const char* fragmentPos = fsBuilder->fragmentPosition();
     for (int i = 0; i < cpe.getEdgeCount(); ++i) {
-        // Add a device space "nudge" of 0.05f, 0.05f to match raster's rounding behavior for
-        // BW clipping/drawing. Since we are "nudging" fragment positions we have to go in
-        // the opposite direction.
-        fsBuilder->codeAppendf("\t\tedge = dot(%s[%d], vec3(%s.x - 0.05, %s.y - 0.05, 1));\n",
+        fsBuilder->codeAppendf("\t\tedge = dot(%s[%d], vec3(%s.x, %s.y, 1));\n",
                                edgeArrayName, i, fragmentPos, fragmentPos);
         if (GrProcessorEdgeTypeIsAA(cpe.getEdgeType())) {
             fsBuilder->codeAppend("\t\tedge = clamp(edge, 0.0, 1.0);\n");