Fix some GPU image filter code to preserve precision and color space

src/effects/SkMorphologyImageFilter.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMorphologyImageFilter.h"
 
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
 #include "SkOpts.h"
 #include "SkReadBuffer.h"
 #include "SkRect.h"
 #include "SkSpecialImage.h"
 #include "SkWriteBuffer.h"
 
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
 #include "GrDrawContext.h"
 #include "GrFixedClip.h"
 #include "GrInvariantOutput.h"
 #include "GrTexture.h"
 #include "SkGr.h"
+#include "SkGrPriv.h"
 #include "effects/Gr1DKernelEffect.h"
 #include "glsl/GrGLSLFragmentProcessor.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 #include "glsl/GrGLSLProgramDataManager.h"
 #include "glsl/GrGLSLUniformHandler.h"
 #endif
 
 sk_sp<SkImageFilter> SkDilateImageFilter::Make(int radiusX, int radiusY,
                                                sk_sp<SkImageFilter> input,
                                                const CropRect* cropRect) {
@@ skipping 434 matching lines @@
 }
 
 static sk_sp<SkSpecialImage> apply_morphology(GrContext* context,
                                               SkSpecialImage* input,
                                               const SkIRect& rect,
                                               GrMorphologyEffect::MorphologyType morphType,
                                               SkISize radius) {
     sk_sp<GrTexture> srcTexture(input->asTextureRef(context));
     SkASSERT(srcTexture);
     sk_sp<SkColorSpace> colorSpace = sk_ref_sp(input->getColorSpace());
+    GrPixelConfig config = GrRenderableConfigForColorSpace(colorSpace.get());
 
     // setup new clip
     const GrFixedClip clip(SkIRect::MakeWH(srcTexture->width(), srcTexture->height()));
 
     const SkIRect dstRect = SkIRect::MakeWH(rect.width(), rect.height());
     SkIRect srcRect = rect;
 
     SkASSERT(radius.width() > 0 || radius.height() > 0);
 
     if (radius.fWidth > 0) {
         sk_sp<GrDrawContext> dstDrawContext(context->makeDrawContext(SkBackingFit::kApprox,
                                                                      rect.width(), rect.height(),
-                                                                     kSkia8888_GrPixelConfig,
-                                                                     colorSpace));
+                                                                     config, colorSpace));
         if (!dstDrawContext) {
             return nullptr;
         }
 
         apply_morphology_pass(dstDrawContext.get(), clip, srcTexture.get(),
                               srcRect, dstRect, radius.fWidth, morphType,
                               Gr1DKernelEffect::kX_Direction);
         SkIRect clearRect = SkIRect::MakeXYWH(dstRect.fLeft, dstRect.fBottom,
                                               dstRect.width(), radius.fHeight);
         GrColor clearColor = GrMorphologyEffect::kErode_MorphologyType == morphType
                                 ? SK_ColorWHITE
                                 : SK_ColorTRANSPARENT;
         dstDrawContext->clear(&clearRect, clearColor, false);
 
         srcTexture = dstDrawContext->asTexture();
         srcRect = dstRect;
     }
     if (radius.fHeight > 0) {
         sk_sp<GrDrawContext> dstDrawContext(context->makeDrawContext(SkBackingFit::kApprox,
                                                                      rect.width(), rect.height(),
-                                                                     kSkia8888_GrPixelConfig,
-                                                                     colorSpace));
+                                                                     config, colorSpace));
         if (!dstDrawContext) {
             return nullptr;
         }
 
         apply_morphology_pass(dstDrawContext.get(), clip, srcTexture.get(),
                               srcRect, dstRect, radius.fHeight, morphType,
                               Gr1DKernelEffect::kY_Direction);
 
         srcTexture = dstDrawContext->asTexture();
     }
@@ skipping 105 matching lines @@
                     inputBM.getAddr32(srcBounds.left(), srcBounds.top()),
                     inputBM.rowBytesAsPixels(),
                     &dst, height, srcBounds);
     }
     offset->fX = bounds.left();
     offset->fY = bounds.top();
 
     return SkSpecialImage::MakeFromRaster(SkIRect::MakeWH(bounds.width(), bounds.height()),
                                           dst, &source->props());
 }