Revert of Remove gpu support for willUseHWAALines.

src/gpu/gl/GrGpuGL.cpp

Index: src/gpu/gl/GrGpuGL.cpp
diff --git a/src/gpu/gl/GrGpuGL.cpp b/src/gpu/gl/GrGpuGL.cpp
index 988b64e679419908c235927ccfbe900f53db657a..a0e08e5a00b295e393e11835c5538c0155ba98dd 100644
--- a/src/gpu/gl/GrGpuGL.cpp
+++ b/src/gpu/gl/GrGpuGL.cpp
@@ -280,8 +280,8 @@
         GL_CALL(LineWidth(1));
     }
 
-    if (resetBits & kMSAAEnable_GrGLBackendState) {
-        fMSAAEnabled = kUnknown_TriState;
+    if (resetBits & kAA_GrGLBackendState) {
+        fHWAAState.invalidate();
     }
 
     fHWActiveTextureUnitIdx = -1; // invalid
@@ -2164,20 +2164,45 @@
 
     const GrRenderTarget* rt = this->getDrawState().getRenderTarget();
     if (kGL_GrGLStandard == this->glStandard()) {
-        if (RT_HAS_MSAA) {
+        // ES doesn't support toggling GL_MULTISAMPLE and doesn't have
+        // smooth lines.
+        // we prefer smooth lines over multisampled lines
+        bool smoothLines = false;
+
+        if (kDrawLines_DrawType == type) {
+            smoothLines = this->willUseHWAALines();
+            if (smoothLines) {
+                if (kYes_TriState != fHWAAState.fSmoothLineEnabled) {
+                    GL_CALL(Enable(GR_GL_LINE_SMOOTH));
+                    fHWAAState.fSmoothLineEnabled = kYes_TriState;
+                    // must disable msaa to use line smoothing
+                    if (RT_HAS_MSAA &&
+                        kNo_TriState != fHWAAState.fMSAAEnabled) {
+                        GL_CALL(Disable(GR_GL_MULTISAMPLE));
+                        fHWAAState.fMSAAEnabled = kNo_TriState;
+                    }
+                }
+            } else {
+                if (kNo_TriState != fHWAAState.fSmoothLineEnabled) {
+                    GL_CALL(Disable(GR_GL_LINE_SMOOTH));
+                    fHWAAState.fSmoothLineEnabled = kNo_TriState;
+                }
+            }
+        }
+        if (!smoothLines && RT_HAS_MSAA) {
             // FIXME: GL_NV_pr doesn't seem to like MSAA disabled. The paths
             // convex hulls of each segment appear to get filled.
             bool enableMSAA = kStencilPath_DrawType == type ||
                               this->getDrawState().isHWAntialiasState();
             if (enableMSAA) {
-                if (kYes_TriState != fMSAAEnabled) {
+                if (kYes_TriState != fHWAAState.fMSAAEnabled) {
                     GL_CALL(Enable(GR_GL_MULTISAMPLE));
-                    fMSAAEnabled = kYes_TriState;
+                    fHWAAState.fMSAAEnabled = kYes_TriState;
                 }
             } else {
-                if (kNo_TriState != fMSAAEnabled) {
+                if (kNo_TriState != fHWAAState.fMSAAEnabled) {
                     GL_CALL(Disable(GR_GL_MULTISAMPLE));
-                    fMSAAEnabled = kNo_TriState;
+                    fHWAAState.fMSAAEnabled = kNo_TriState;
                 }
             }
         }
@@ -2203,36 +2228,52 @@
 void GrGpuGL::flushBlend(bool isLines,
                          GrBlendCoeff srcCoeff,
                          GrBlendCoeff dstCoeff) {
-    // any optimization to disable blending should have already been applied and
-    // tweaked the coeffs to (1, 0).
-    bool blendOff = kOne_GrBlendCoeff == srcCoeff && kZero_GrBlendCoeff == dstCoeff;
-    if (blendOff) {
-        if (kNo_TriState != fHWBlendState.fEnabled) {
-            GL_CALL(Disable(GR_GL_BLEND));
-            fHWBlendState.fEnabled = kNo_TriState;
-        }
-    } else {
+    if (isLines && this->willUseHWAALines()) {
         if (kYes_TriState != fHWBlendState.fEnabled) {
             GL_CALL(Enable(GR_GL_BLEND));
             fHWBlendState.fEnabled = kYes_TriState;
         }
-        if (fHWBlendState.fSrcCoeff != srcCoeff ||
-            fHWBlendState.fDstCoeff != dstCoeff) {
-            GL_CALL(BlendFunc(gXfermodeCoeff2Blend[srcCoeff],
-                              gXfermodeCoeff2Blend[dstCoeff]));
-            fHWBlendState.fSrcCoeff = srcCoeff;
-            fHWBlendState.fDstCoeff = dstCoeff;
-        }
-        GrColor blendConst = this->getDrawState().getBlendConstant();
-        if ((BlendCoeffReferencesConstant(srcCoeff) ||
-             BlendCoeffReferencesConstant(dstCoeff)) &&
-            (!fHWBlendState.fConstColorValid ||
-             fHWBlendState.fConstColor != blendConst)) {
-            GrGLfloat c[4];
-            GrColorToRGBAFloat(blendConst, c);
-            GL_CALL(BlendColor(c[0], c[1], c[2], c[3]));
-            fHWBlendState.fConstColor = blendConst;
-            fHWBlendState.fConstColorValid = true;
+        if (kSA_GrBlendCoeff != fHWBlendState.fSrcCoeff ||
+            kISA_GrBlendCoeff != fHWBlendState.fDstCoeff) {
+            GL_CALL(BlendFunc(gXfermodeCoeff2Blend[kSA_GrBlendCoeff],
+                              gXfermodeCoeff2Blend[kISA_GrBlendCoeff]));
+            fHWBlendState.fSrcCoeff = kSA_GrBlendCoeff;
+            fHWBlendState.fDstCoeff = kISA_GrBlendCoeff;
+        }
+    } else {
+        // any optimization to disable blending should
+        // have already been applied and tweaked the coeffs
+        // to (1, 0).
+        bool blendOff = kOne_GrBlendCoeff == srcCoeff &&
+                        kZero_GrBlendCoeff == dstCoeff;
+        if (blendOff) {
+            if (kNo_TriState != fHWBlendState.fEnabled) {
+                GL_CALL(Disable(GR_GL_BLEND));
+                fHWBlendState.fEnabled = kNo_TriState;
+            }
+        } else {
+            if (kYes_TriState != fHWBlendState.fEnabled) {
+                GL_CALL(Enable(GR_GL_BLEND));
+                fHWBlendState.fEnabled = kYes_TriState;
+            }
+            if (fHWBlendState.fSrcCoeff != srcCoeff ||
+                fHWBlendState.fDstCoeff != dstCoeff) {
+                GL_CALL(BlendFunc(gXfermodeCoeff2Blend[srcCoeff],
+                                  gXfermodeCoeff2Blend[dstCoeff]));
+                fHWBlendState.fSrcCoeff = srcCoeff;
+                fHWBlendState.fDstCoeff = dstCoeff;
+            }
+            GrColor blendConst = this->getDrawState().getBlendConstant();
+            if ((BlendCoeffReferencesConstant(srcCoeff) ||
+                 BlendCoeffReferencesConstant(dstCoeff)) &&
+                (!fHWBlendState.fConstColorValid ||
+                 fHWBlendState.fConstColor != blendConst)) {
+                GrGLfloat c[4];
+                GrColorToRGBAFloat(blendConst, c);
+                GL_CALL(BlendColor(c[0], c[1], c[2], c[3]));
+                fHWBlendState.fConstColor = blendConst;
+                fHWBlendState.fConstColorValid = true;
+            }
         }
     }
 }