src/gpu/SkGr.cpp - platform/external/skia - Gitiles

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "include/core/SkCanvas.h"
 #include "include/core/SkColorFilter.h"
 #include "include/core/SkData.h"
 #include "include/core/SkPixelRef.h"
 #include "include/gpu/GrContext.h"
 #include "include/gpu/GrTypes.h"
 #include "include/private/GrRecordingContext.h"
 #include "include/private/SkImageInfoPriv.h"
 #include "include/private/SkTemplates.h"
 #include "src/core/SkAutoMalloc.h"
 #include "src/core/SkBlendModePriv.h"
 #include "src/core/SkImagePriv.h"
 #include "src/core/SkMaskFilterBase.h"
 #include "src/core/SkMessageBus.h"
 #include "src/core/SkMipMap.h"
 #include "src/core/SkPaintPriv.h"
 #include "src/core/SkResourceCache.h"
 #include "src/core/SkTraceEvent.h"
 #include "src/gpu/GrBitmapTextureMaker.h"
 #include "src/gpu/GrCaps.h"
 #include "src/gpu/GrColorSpaceXform.h"
 #include "src/gpu/GrContextPriv.h"
 #include "src/gpu/GrGpuResourcePriv.h"
 #include "src/gpu/GrPaint.h"
 #include "src/gpu/GrProxyProvider.h"
 #include "src/gpu/GrRecordingContextPriv.h"
 #include "src/gpu/GrTextureProxy.h"
 #include "src/gpu/GrXferProcessor.h"
 #include "src/gpu/SkGr.h"
 #include "src/gpu/effects/GrBicubicEffect.h"
 #include "src/gpu/effects/GrPorterDuffXferProcessor.h"
 #include "src/gpu/effects/GrSkSLFP.h"
 #include "src/gpu/effects/GrXfermodeFragmentProcessor.h"
 #include "src/gpu/effects/generated/GrConstColorProcessor.h"
 #include "src/image/SkImage_Base.h"
 #include "src/shaders/SkShaderBase.h"

 #if SK_SUPPORT_GPU
 GR_FP_SRC_STRING SKSL_DITHER_SRC = R"(
 // This controls the range of values added to color channels
 layout(key) in int rangeType;

 void main(float x, float y, inout half4 color) {
     half value;
     half range;
     @switch (rangeType) {
         case 0:
             range = 1.0 / 255.0;
             break;
         case 1:
             range = 1.0 / 63.0;
             break;
         default:
             // Experimentally this looks better than the expected value of 1/15.
             range = 1.0 / 15.0;
             break;
     }
     @if (sk_Caps.integerSupport) {
         // This ordered-dither code is lifted from the cpu backend.
         uint x = uint(x);
         uint y = uint(y);
         uint m = (y & 1) << 5 | (x & 1) << 4 |
                  (y & 2) << 2 | (x & 2) << 1 |
                  (y & 4) >> 1 | (x & 4) >> 2;
         value = half(m) * 1.0 / 64.0 - 63.0 / 128.0;
     } else {
         // Simulate the integer effect used above using step/mod. For speed, simulates a 4x4
         // dither pattern rather than an 8x8 one.
         half4 modValues = mod(half4(half(x), half(y), half(x), half(y)), half4(2.0, 2.0, 4.0, 4.0));
         half4 stepValues = step(modValues, half4(1.0, 1.0, 2.0, 2.0));
         value = dot(stepValues, half4(8.0 / 16.0, 4.0 / 16.0, 2.0 / 16.0, 1.0 / 16.0)) - 15.0 / 32.0;
     }
     // For each color channel, add the random offset to the channel value and then clamp
     // between 0 and alpha to keep the color premultiplied.
     color = half4(clamp(color.rgb + value * range, 0.0, color.a), color.a);
 }
 )";
 #endif

 GrSurfaceDesc GrImageInfoToSurfaceDesc(const SkImageInfo& info) {
     GrSurfaceDesc desc;
     desc.fWidth = info.width();
     desc.fHeight = info.height();
     desc.fConfig = SkImageInfo2GrPixelConfig(info);
     return desc;
 }

 void GrMakeKeyFromImageID(GrUniqueKey* key, uint32_t imageID, const SkIRect& imageBounds) {
     SkASSERT(key);
     SkASSERT(imageID);
     SkASSERT(!imageBounds.isEmpty());
     static const GrUniqueKey::Domain kImageIDDomain = GrUniqueKey::GenerateDomain();
     GrUniqueKey::Builder builder(key, kImageIDDomain, 5, "Image");
     builder[0] = imageID;
     builder[1] = imageBounds.fLeft;
     builder[2] = imageBounds.fTop;
     builder[3] = imageBounds.fRight;
     builder[4] = imageBounds.fBottom;
 }

 ////////////////////////////////////////////////////////////////////////////////

 void GrInstallBitmapUniqueKeyInvalidator(const GrUniqueKey& key, uint32_t contextUniqueID,
                                          SkPixelRef* pixelRef) {
     class Invalidator : public SkPixelRef::GenIDChangeListener {
     public:
         explicit Invalidator(const GrUniqueKey& key, uint32_t contextUniqueID)
                 : fMsg(key, contextUniqueID) {}

     private:
         GrUniqueKeyInvalidatedMessage fMsg;

         void onChange() override { SkMessageBus<GrUniqueKeyInvalidatedMessage>::Post(fMsg); }
     };

     pixelRef->addGenIDChangeListener(new Invalidator(key, contextUniqueID));
 }

 sk_sp<GrTextureProxy> GrCopyBaseMipMapToTextureProxy(GrRecordingContext* ctx,
                                                      GrTextureProxy* baseProxy) {
     SkASSERT(baseProxy);

     if (!ctx->priv().caps()->isFormatCopyable(baseProxy->backendFormat())) {
         return nullptr;
     }
     return GrSurfaceProxy::Copy(ctx, baseProxy, GrMipMapped::kYes, SkBackingFit::kExact,
                                 SkBudgeted::kYes);
 }

 sk_sp<GrTextureProxy> GrRefCachedBitmapTextureProxy(GrRecordingContext* ctx,
                                                     const SkBitmap& bitmap,
                                                     const GrSamplerState& params,
                                                     SkScalar scaleAdjust[2]) {
     return GrBitmapTextureMaker(ctx, bitmap).refTextureProxyForParams(params, scaleAdjust);
 }

 sk_sp<GrTextureProxy> GrMakeCachedBitmapProxy(GrProxyProvider* proxyProvider,
                                               const SkBitmap& bitmap,
                                               SkBackingFit fit) {
     if (!bitmap.peekPixels(nullptr)) {
         return nullptr;
     }

     // In non-ddl we will always instantiate right away. Thus we never want to copy the SkBitmap
     // even if its mutable. In ddl, if the bitmap is mutable then we must make a copy since the
     // upload of the data to the gpu can happen at anytime and the bitmap may change by then.
     SkCopyPixelsMode cpyMode = proxyProvider->renderingDirectly() ? kNever_SkCopyPixelsMode
                                                                   : kIfMutable_SkCopyPixelsMode;
     sk_sp<SkImage> image = SkMakeImageFromRasterBitmap(bitmap, cpyMode);

     if (!image) {
         return nullptr;
     }

     return GrMakeCachedImageProxy(proxyProvider, std::move(image), fit);
 }

 static void create_unique_key_for_image(const SkImage* image, GrUniqueKey* result) {
     if (!image) {
         result->reset(); // will be invalid
         return;
     }

     if (const SkBitmap* bm = as_IB(image)->onPeekBitmap()) {
         if (!bm->isVolatile()) {
             SkIPoint origin = bm->pixelRefOrigin();
             SkIRect subset = SkIRect::MakeXYWH(origin.fX, origin.fY, bm->width(), bm->height());
             GrMakeKeyFromImageID(result, bm->getGenerationID(), subset);
         }
         return;
     }

     GrMakeKeyFromImageID(result, image->uniqueID(), image->bounds());
 }

 sk_sp<GrTextureProxy> GrMakeCachedImageProxy(GrProxyProvider* proxyProvider,
                                              sk_sp<SkImage> srcImage,
                                              SkBackingFit fit) {
     sk_sp<GrTextureProxy> proxy;
     GrUniqueKey originalKey;

     create_unique_key_for_image(srcImage.get(), &originalKey);

     if (originalKey.isValid()) {
         proxy = proxyProvider->findOrCreateProxyByUniqueKey(originalKey, kTopLeft_GrSurfaceOrigin);
     }
     if (!proxy) {
         proxy = proxyProvider->createTextureProxy(srcImage, GrRenderable::kNo, 1, SkBudgeted::kYes,
                                                   fit);
         if (proxy && originalKey.isValid()) {
             proxyProvider->assignUniqueKeyToProxy(originalKey, proxy.get());
             const SkBitmap* bm = as_IB(srcImage.get())->onPeekBitmap();
             // When recording DDLs we do not want to install change listeners because doing
             // so isn't threadsafe.
             if (bm && proxyProvider->renderingDirectly()) {
                 GrInstallBitmapUniqueKeyInvalidator(originalKey, proxyProvider->contextID(),
                                                     bm->pixelRef());
             }
         }
     }

     return proxy;
 }

 ///////////////////////////////////////////////////////////////////////////////

 SkPMColor4f SkColorToPMColor4f(SkColor c, const GrColorSpaceInfo& colorSpaceInfo) {
     SkColor4f color = SkColor4f::FromColor(c);
     if (auto* xform = colorSpaceInfo.colorSpaceXformFromSRGB()) {
         color = xform->apply(color);
     }
     return color.premul();
 }

 SkColor4f SkColor4fPrepForDst(SkColor4f color, const GrColorSpaceInfo& colorSpaceInfo) {
     if (auto* xform = colorSpaceInfo.colorSpaceXformFromSRGB()) {
         color = xform->apply(color);
     }
     return color;
 }

 ///////////////////////////////////////////////////////////////////////////////

 GrPixelConfig SkColorType2GrPixelConfig(const SkColorType type) {
     switch (type) {
         case kUnknown_SkColorType:
             return kUnknown_GrPixelConfig;
         case kAlpha_8_SkColorType:
             return kAlpha_8_GrPixelConfig;
         case kRGB_565_SkColorType:
             return kRGB_565_GrPixelConfig;
         case kARGB_4444_SkColorType:
             return kRGBA_4444_GrPixelConfig;
         case kRGBA_8888_SkColorType:
             return kRGBA_8888_GrPixelConfig;
         case kRGB_888x_SkColorType:
             return kRGB_888_GrPixelConfig;
         case kBGRA_8888_SkColorType:
             return kBGRA_8888_GrPixelConfig;
         case kRGBA_1010102_SkColorType:
             return kRGBA_1010102_GrPixelConfig;
         case kRGB_101010x_SkColorType:
             return kUnknown_GrPixelConfig;
         case kGray_8_SkColorType:
             return kGray_8_GrPixelConfig;
         case kRGBA_F16Norm_SkColorType:
             return kRGBA_half_Clamped_GrPixelConfig;
         case kRGBA_F16_SkColorType:
             return kRGBA_half_GrPixelConfig;
         case kRGBA_F32_SkColorType:
             return kRGBA_float_GrPixelConfig;
     }
     SkASSERT(0);    // shouldn't get here
     return kUnknown_GrPixelConfig;
 }

 GrPixelConfig SkImageInfo2GrPixelConfig(const SkImageInfo& info) {
     return SkColorType2GrPixelConfig(info.colorType());
 }

 bool GrPixelConfigToColorType(GrPixelConfig config, SkColorType* ctOut) {
     SkColorType ct = GrColorTypeToSkColorType(GrPixelConfigToColorType(config));
     if (kUnknown_SkColorType != ct) {
         if (ctOut) {
             *ctOut = ct;
         }
         return true;
     }
     return false;
 }

 ////////////////////////////////////////////////////////////////////////////////////////////////

 static inline bool blend_requires_shader(const SkBlendMode mode) {
     return SkBlendMode::kDst != mode;
 }

 #ifndef SK_IGNORE_GPU_DITHER
 static inline int32_t dither_range_type_for_config(GrColorType dstColorType) {
     switch (dstColorType) {
         case GrColorType::kGray_8:
         case GrColorType::kRGBA_8888:
         case GrColorType::kRGB_888x:
         case GrColorType::kRG_88:
         case GrColorType::kBGRA_8888:
         case GrColorType::kR_16:
         case GrColorType::kRG_1616:
         // Experimental (for Y416 and mutant P016/P010)
         case GrColorType::kRGBA_16161616:
         case GrColorType::kRG_F16:
             return 0;
         case GrColorType::kBGR_565:
             return 1;
         case GrColorType::kABGR_4444:
             return 2;
         case GrColorType::kUnknown:
         case GrColorType::kRGBA_8888_SRGB:
         case GrColorType::kRGBA_1010102:
         case GrColorType::kAlpha_F16:
         case GrColorType::kRGBA_F32:
         case GrColorType::kRGBA_F16:
         case GrColorType::kRGBA_F16_Clamped:
         case GrColorType::kAlpha_8:
             return -1;
     }
     SkUNREACHABLE;
 }
 #endif

 static inline bool skpaint_to_grpaint_impl(GrRecordingContext* context,
                                            const GrColorSpaceInfo& colorSpaceInfo,
                                            const SkPaint& skPaint,
                                            const SkMatrix& viewM,
                                            std::unique_ptr<GrFragmentProcessor>* shaderProcessor,
                                            SkBlendMode* primColorMode,
                                            GrPaint* grPaint) {
     // Convert SkPaint color to 4f format in the destination color space
     SkColor4f origColor = SkColor4fPrepForDst(skPaint.getColor4f(), colorSpaceInfo);

     GrFPArgs fpArgs(context, &viewM, skPaint.getFilterQuality(), &colorSpaceInfo);

     // Setup the initial color considering the shader, the SkPaint color, and the presence or not
     // of per-vertex colors.
     std::unique_ptr<GrFragmentProcessor> shaderFP;
     if (!primColorMode || blend_requires_shader(*primColorMode)) {
         fpArgs.fInputColorIsOpaque = origColor.isOpaque();
         if (shaderProcessor) {
             shaderFP = std::move(*shaderProcessor);
         } else if (const auto* shader = as_SB(skPaint.getShader())) {
             shaderFP = shader->asFragmentProcessor(fpArgs);
             if (!shaderFP) {
                 return false;
             }
         }
     }

     // Set this in below cases if the output of the shader/paint-color/paint-alpha/primXfermode is
     // a known constant value. In that case we can simply apply a color filter during this
     // conversion without converting the color filter to a GrFragmentProcessor.
     bool applyColorFilterToPaintColor = false;
     if (shaderFP) {
         if (primColorMode) {
             // There is a blend between the primitive color and the shader color. The shader sees
             // the opaque paint color. The shader's output is blended using the provided mode by
             // the primitive color. The blended color is then modulated by the paint's alpha.

             // The geometry processor will insert the primitive color to start the color chain, so
             // the GrPaint color will be ignored.

             SkPMColor4f shaderInput = origColor.makeOpaque().premul();
             shaderFP = GrFragmentProcessor::OverrideInput(std::move(shaderFP), shaderInput);
             shaderFP = GrXfermodeFragmentProcessor::MakeFromSrcProcessor(std::move(shaderFP),
                                                                          *primColorMode);

             // The above may return null if compose results in a pass through of the prim color.
             if (shaderFP) {
                 grPaint->addColorFragmentProcessor(std::move(shaderFP));
             }

             // We can ignore origColor here - alpha is unchanged by gamma
             float paintAlpha = skPaint.getColor4f().fA;
             if (1.0f != paintAlpha) {
                 // No gamut conversion - paintAlpha is a (linear) alpha value, splatted to all
                 // color channels. It's value should be treated as the same in ANY color space.
                 grPaint->addColorFragmentProcessor(GrConstColorProcessor::Make(
                     { paintAlpha, paintAlpha, paintAlpha, paintAlpha },
                     GrConstColorProcessor::InputMode::kModulateRGBA));
             }
         } else {
             // The shader's FP sees the paint *unpremul* color
             SkPMColor4f origColorAsPM = { origColor.fR, origColor.fG, origColor.fB, origColor.fA };
             grPaint->setColor4f(origColorAsPM);
             grPaint->addColorFragmentProcessor(std::move(shaderFP));
         }
     } else {
         if (primColorMode) {
             // There is a blend between the primitive color and the paint color. The blend considers
             // the opaque paint color. The paint's alpha is applied to the post-blended color.
             SkPMColor4f opaqueColor = origColor.makeOpaque().premul();
             auto processor = GrConstColorProcessor::Make(opaqueColor,
                                                          GrConstColorProcessor::InputMode::kIgnore);
             processor = GrXfermodeFragmentProcessor::MakeFromSrcProcessor(std::move(processor),
                                                                           *primColorMode);
             if (processor) {
                 grPaint->addColorFragmentProcessor(std::move(processor));
             }

             grPaint->setColor4f(opaqueColor);

             // We can ignore origColor here - alpha is unchanged by gamma
             float paintAlpha = skPaint.getColor4f().fA;
             if (1.0f != paintAlpha) {
                 // No gamut conversion - paintAlpha is a (linear) alpha value, splatted to all
                 // color channels. It's value should be treated as the same in ANY color space.
                 grPaint->addColorFragmentProcessor(GrConstColorProcessor::Make(
                     { paintAlpha, paintAlpha, paintAlpha, paintAlpha },
                     GrConstColorProcessor::InputMode::kModulateRGBA));
             }
         } else {
             // No shader, no primitive color.
             grPaint->setColor4f(origColor.premul());
             applyColorFilterToPaintColor = true;
         }
     }

     SkColorFilter* colorFilter = skPaint.getColorFilter();
     if (colorFilter) {
         if (applyColorFilterToPaintColor) {
             grPaint->setColor4f(
                     colorFilter->filterColor4f(origColor, colorSpaceInfo.colorSpace()).premul());
         } else {
             auto cfFP = colorFilter->asFragmentProcessor(context, colorSpaceInfo);
             if (cfFP) {
                 grPaint->addColorFragmentProcessor(std::move(cfFP));
             } else {
                 return false;
             }
         }
     }

     SkMaskFilterBase* maskFilter = as_MFB(skPaint.getMaskFilter());
     if (maskFilter) {
         // We may have set this before passing to the SkShader.
         fpArgs.fInputColorIsOpaque = false;
         if (auto mfFP = maskFilter->asFragmentProcessor(fpArgs)) {
             grPaint->addCoverageFragmentProcessor(std::move(mfFP));
         }
     }

     // When the xfermode is null on the SkPaint (meaning kSrcOver) we need the XPFactory field on
     // the GrPaint to also be null (also kSrcOver).
     SkASSERT(!grPaint->getXPFactory());
     if (!skPaint.isSrcOver()) {
         grPaint->setXPFactory(SkBlendMode_AsXPFactory(skPaint.getBlendMode()));
     }

 #ifndef SK_IGNORE_GPU_DITHER
     // Conservative default, in case GrPixelConfigToColorType() fails.
     GrColorType ct = colorSpaceInfo.colorType();
     if (SkPaintPriv::ShouldDither(skPaint, GrColorTypeToSkColorType(ct)) &&
         grPaint->numColorFragmentProcessors() > 0) {
         int32_t ditherRange = dither_range_type_for_config(ct);
         if (ditherRange >= 0) {
             static int ditherIndex = GrSkSLFP::NewIndex();
             auto ditherFP = GrSkSLFP::Make(context, ditherIndex, "Dither", SKSL_DITHER_SRC,
                                            &ditherRange, sizeof(ditherRange));
             if (ditherFP) {
                 grPaint->addColorFragmentProcessor(std::move(ditherFP));
             }
         }
     }
 #endif
     return true;
 }

 bool SkPaintToGrPaint(GrRecordingContext* context, const GrColorSpaceInfo& colorSpaceInfo,
                       const SkPaint& skPaint, const SkMatrix& viewM, GrPaint* grPaint) {
     return skpaint_to_grpaint_impl(context, colorSpaceInfo, skPaint, viewM, nullptr, nullptr,
                                    grPaint);
 }

 /** Replaces the SkShader (if any) on skPaint with the passed in GrFragmentProcessor. */
 bool SkPaintToGrPaintReplaceShader(GrRecordingContext* context,
                                    const GrColorSpaceInfo& colorSpaceInfo,
                                    const SkPaint& skPaint,
                                    std::unique_ptr<GrFragmentProcessor> shaderFP,
                                    GrPaint* grPaint) {
     if (!shaderFP) {
         return false;
     }
     return skpaint_to_grpaint_impl(context, colorSpaceInfo, skPaint, SkMatrix::I(), &shaderFP,
                                    nullptr, grPaint);
 }

 /** Ignores the SkShader (if any) on skPaint. */
 bool SkPaintToGrPaintNoShader(GrRecordingContext* context,
                               const GrColorSpaceInfo& colorSpaceInfo,
                               const SkPaint& skPaint,
                               GrPaint* grPaint) {
     // Use a ptr to a nullptr to to indicate that the SkShader is ignored and not replaced.
     std::unique_ptr<GrFragmentProcessor> nullShaderFP(nullptr);
     return skpaint_to_grpaint_impl(context, colorSpaceInfo, skPaint, SkMatrix::I(), &nullShaderFP,
                                    nullptr, grPaint);
 }

 /** Blends the SkPaint's shader (or color if no shader) with a per-primitive color which must
 be setup as a vertex attribute using the specified SkBlendMode. */
 bool SkPaintToGrPaintWithXfermode(GrRecordingContext* context,
                                   const GrColorSpaceInfo& colorSpaceInfo,
                                   const SkPaint& skPaint,
                                   const SkMatrix& viewM,
                                   SkBlendMode primColorMode,
                                   GrPaint* grPaint) {
     return skpaint_to_grpaint_impl(context, colorSpaceInfo, skPaint, viewM, nullptr, &primColorMode,
                                    grPaint);
 }

 bool SkPaintToGrPaintWithTexture(GrRecordingContext* context,
                                  const GrColorSpaceInfo& colorSpaceInfo,
                                  const SkPaint& paint,
                                  const SkMatrix& viewM,
                                  std::unique_ptr<GrFragmentProcessor> fp,
                                  bool textureIsAlphaOnly,
                                  GrPaint* grPaint) {
     std::unique_ptr<GrFragmentProcessor> shaderFP;
     if (textureIsAlphaOnly) {
         if (const auto* shader = as_SB(paint.getShader())) {
             shaderFP = shader->asFragmentProcessor(GrFPArgs(
                     context, &viewM, paint.getFilterQuality(), &colorSpaceInfo));
             if (!shaderFP) {
                 return false;
             }
             std::unique_ptr<GrFragmentProcessor> fpSeries[] = { std::move(shaderFP), std::move(fp) };
             shaderFP = GrFragmentProcessor::RunInSeries(fpSeries, 2);
         } else {
             shaderFP = GrFragmentProcessor::MakeInputPremulAndMulByOutput(std::move(fp));
         }
     } else {
         if (paint.getColor4f().isOpaque()) {
             shaderFP = GrFragmentProcessor::OverrideInput(std::move(fp), SK_PMColor4fWHITE, false);
         } else {
             shaderFP = GrFragmentProcessor::MulChildByInputAlpha(std::move(fp));
         }
     }

     return SkPaintToGrPaintReplaceShader(context, colorSpaceInfo, paint, std::move(shaderFP),
                                          grPaint);
 }


 ////////////////////////////////////////////////////////////////////////////////////////////////

 GrSamplerState::Filter GrSkFilterQualityToGrFilterMode(SkFilterQuality paintFilterQuality,
                                                        const SkMatrix& viewM,
                                                        const SkMatrix& localM,
                                                        bool sharpenMipmappedTextures,
                                                        bool* doBicubic) {
     *doBicubic = false;
     GrSamplerState::Filter textureFilterMode;
     switch (paintFilterQuality) {
         case kNone_SkFilterQuality:
             textureFilterMode = GrSamplerState::Filter::kNearest;
             break;
         case kLow_SkFilterQuality:
             textureFilterMode = GrSamplerState::Filter::kBilerp;
             break;
         case kMedium_SkFilterQuality: {
             SkMatrix matrix;
             matrix.setConcat(viewM, localM);
             // With sharp mips, we bias lookups by -0.5. That means our final LOD is >= 0 until the
             // computed LOD is >= 0.5. At what scale factor does a texture get an LOD of 0.5?
             //
             // Want:  0       = log2(1/s) - 0.5
             //        0.5     = log2(1/s)
             //        2^0.5   = 1/s
             //        1/2^0.5 = s
             //        2^0.5/2 = s
             SkScalar mipScale = sharpenMipmappedTextures ? SK_ScalarRoot2Over2 : SK_Scalar1;
             if (matrix.getMinScale() < mipScale) {
                 textureFilterMode = GrSamplerState::Filter::kMipMap;
             } else {
                 // Don't trigger MIP level generation unnecessarily.
                 textureFilterMode = GrSamplerState::Filter::kBilerp;
             }
             break;
         }
         case kHigh_SkFilterQuality: {
             SkMatrix matrix;
             matrix.setConcat(viewM, localM);
             *doBicubic = GrBicubicEffect::ShouldUseBicubic(matrix, &textureFilterMode);
             break;
         }
         default:
             // Should be unreachable.  If not, fall back to mipmaps.
             textureFilterMode = GrSamplerState::Filter::kMipMap;
             break;

     }
     return textureFilterMode;
 }
	/*
	* Copyright 2010 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "include/core/SkCanvas.h"
	#include "include/core/SkColorFilter.h"
	#include "include/core/SkData.h"
	#include "include/core/SkPixelRef.h"
	#include "include/gpu/GrContext.h"
	#include "include/gpu/GrTypes.h"
	#include "include/private/GrRecordingContext.h"
	#include "include/private/SkImageInfoPriv.h"
	#include "include/private/SkTemplates.h"
	#include "src/core/SkAutoMalloc.h"
	#include "src/core/SkBlendModePriv.h"
	#include "src/core/SkImagePriv.h"
	#include "src/core/SkMaskFilterBase.h"
	#include "src/core/SkMessageBus.h"
	#include "src/core/SkMipMap.h"
	#include "src/core/SkPaintPriv.h"
	#include "src/core/SkResourceCache.h"
	#include "src/core/SkTraceEvent.h"
	#include "src/gpu/GrBitmapTextureMaker.h"
	#include "src/gpu/GrCaps.h"
	#include "src/gpu/GrColorSpaceXform.h"
	#include "src/gpu/GrContextPriv.h"
	#include "src/gpu/GrGpuResourcePriv.h"
	#include "src/gpu/GrPaint.h"
	#include "src/gpu/GrProxyProvider.h"
	#include "src/gpu/GrRecordingContextPriv.h"
	#include "src/gpu/GrTextureProxy.h"
	#include "src/gpu/GrXferProcessor.h"
	#include "src/gpu/SkGr.h"
	#include "src/gpu/effects/GrBicubicEffect.h"
	#include "src/gpu/effects/GrPorterDuffXferProcessor.h"
	#include "src/gpu/effects/GrSkSLFP.h"
	#include "src/gpu/effects/GrXfermodeFragmentProcessor.h"
	#include "src/gpu/effects/generated/GrConstColorProcessor.h"
	#include "src/image/SkImage_Base.h"
	#include "src/shaders/SkShaderBase.h"

	#if SK_SUPPORT_GPU
	GR_FP_SRC_STRING SKSL_DITHER_SRC = R"(
	// This controls the range of values added to color channels
	layout(key) in int rangeType;

	void main(float x, float y, inout half4 color) {
	half value;
	half range;
	@switch (rangeType) {
	case 0:
	range = 1.0 / 255.0;
	break;
	case 1:
	range = 1.0 / 63.0;
	break;
	default:
	// Experimentally this looks better than the expected value of 1/15.
	range = 1.0 / 15.0;
	break;
	}
	@if (sk_Caps.integerSupport) {
	// This ordered-dither code is lifted from the cpu backend.
	uint x = uint(x);
	uint y = uint(y);
	uint m = (y & 1) << 5 \| (x & 1) << 4 \|
	(y & 2) << 2 \| (x & 2) << 1 \|
	(y & 4) >> 1 \| (x & 4) >> 2;
	value = half(m) * 1.0 / 64.0 - 63.0 / 128.0;
	} else {
	// Simulate the integer effect used above using step/mod. For speed, simulates a 4x4
	// dither pattern rather than an 8x8 one.
	half4 modValues = mod(half4(half(x), half(y), half(x), half(y)), half4(2.0, 2.0, 4.0, 4.0));
	half4 stepValues = step(modValues, half4(1.0, 1.0, 2.0, 2.0));
	value = dot(stepValues, half4(8.0 / 16.0, 4.0 / 16.0, 2.0 / 16.0, 1.0 / 16.0)) - 15.0 / 32.0;
	}
	// For each color channel, add the random offset to the channel value and then clamp
	// between 0 and alpha to keep the color premultiplied.
	color = half4(clamp(color.rgb + value * range, 0.0, color.a), color.a);
	}
	)";
	#endif

	GrSurfaceDesc GrImageInfoToSurfaceDesc(const SkImageInfo& info) {
	GrSurfaceDesc desc;
	desc.fWidth = info.width();
	desc.fHeight = info.height();
	desc.fConfig = SkImageInfo2GrPixelConfig(info);
	return desc;
	}

	void GrMakeKeyFromImageID(GrUniqueKey* key, uint32_t imageID, const SkIRect& imageBounds) {
	SkASSERT(key);
	SkASSERT(imageID);
	SkASSERT(!imageBounds.isEmpty());
	static const GrUniqueKey::Domain kImageIDDomain = GrUniqueKey::GenerateDomain();
	GrUniqueKey::Builder builder(key, kImageIDDomain, 5, "Image");
	builder[0] = imageID;
	builder[1] = imageBounds.fLeft;
	builder[2] = imageBounds.fTop;
	builder[3] = imageBounds.fRight;
	builder[4] = imageBounds.fBottom;
	}

	////////////////////////////////////////////////////////////////////////////////

	void GrInstallBitmapUniqueKeyInvalidator(const GrUniqueKey& key, uint32_t contextUniqueID,
	SkPixelRef* pixelRef) {
	class Invalidator : public SkPixelRef::GenIDChangeListener {
	public:
	explicit Invalidator(const GrUniqueKey& key, uint32_t contextUniqueID)
	: fMsg(key, contextUniqueID) {}

	private:
	GrUniqueKeyInvalidatedMessage fMsg;

	void onChange() override { SkMessageBus<GrUniqueKeyInvalidatedMessage>::Post(fMsg); }
	};

	pixelRef->addGenIDChangeListener(new Invalidator(key, contextUniqueID));
	}

	sk_sp<GrTextureProxy> GrCopyBaseMipMapToTextureProxy(GrRecordingContext* ctx,
	GrTextureProxy* baseProxy) {
	SkASSERT(baseProxy);

	if (!ctx->priv().caps()->isFormatCopyable(baseProxy->backendFormat())) {
	return nullptr;
	}
	return GrSurfaceProxy::Copy(ctx, baseProxy, GrMipMapped::kYes, SkBackingFit::kExact,
	SkBudgeted::kYes);
	}

	sk_sp<GrTextureProxy> GrRefCachedBitmapTextureProxy(GrRecordingContext* ctx,
	const SkBitmap& bitmap,
	const GrSamplerState& params,
	SkScalar scaleAdjust[2]) {
	return GrBitmapTextureMaker(ctx, bitmap).refTextureProxyForParams(params, scaleAdjust);
	}

	sk_sp<GrTextureProxy> GrMakeCachedBitmapProxy(GrProxyProvider* proxyProvider,
	const SkBitmap& bitmap,
	SkBackingFit fit) {
	if (!bitmap.peekPixels(nullptr)) {
	return nullptr;
	}

	// In non-ddl we will always instantiate right away. Thus we never want to copy the SkBitmap
	// even if its mutable. In ddl, if the bitmap is mutable then we must make a copy since the
	// upload of the data to the gpu can happen at anytime and the bitmap may change by then.
	SkCopyPixelsMode cpyMode = proxyProvider->renderingDirectly() ? kNever_SkCopyPixelsMode
	: kIfMutable_SkCopyPixelsMode;
	sk_sp<SkImage> image = SkMakeImageFromRasterBitmap(bitmap, cpyMode);

	if (!image) {
	return nullptr;
	}

	return GrMakeCachedImageProxy(proxyProvider, std::move(image), fit);
	}

	static void create_unique_key_for_image(const SkImage* image, GrUniqueKey* result) {
	if (!image) {
	result->reset(); // will be invalid
	return;
	}

	if (const SkBitmap* bm = as_IB(image)->onPeekBitmap()) {
	if (!bm->isVolatile()) {
	SkIPoint origin = bm->pixelRefOrigin();
	SkIRect subset = SkIRect::MakeXYWH(origin.fX, origin.fY, bm->width(), bm->height());
	GrMakeKeyFromImageID(result, bm->getGenerationID(), subset);
	}
	return;
	}

	GrMakeKeyFromImageID(result, image->uniqueID(), image->bounds());
	}

	sk_sp<GrTextureProxy> GrMakeCachedImageProxy(GrProxyProvider* proxyProvider,
	sk_sp<SkImage> srcImage,
	SkBackingFit fit) {
	sk_sp<GrTextureProxy> proxy;
	GrUniqueKey originalKey;

	create_unique_key_for_image(srcImage.get(), &originalKey);

	if (originalKey.isValid()) {
	proxy = proxyProvider->findOrCreateProxyByUniqueKey(originalKey, kTopLeft_GrSurfaceOrigin);
	}
	if (!proxy) {
	proxy = proxyProvider->createTextureProxy(srcImage, GrRenderable::kNo, 1, SkBudgeted::kYes,
	fit);
	if (proxy && originalKey.isValid()) {
	proxyProvider->assignUniqueKeyToProxy(originalKey, proxy.get());
	const SkBitmap* bm = as_IB(srcImage.get())->onPeekBitmap();
	// When recording DDLs we do not want to install change listeners because doing
	// so isn't threadsafe.
	if (bm && proxyProvider->renderingDirectly()) {
	GrInstallBitmapUniqueKeyInvalidator(originalKey, proxyProvider->contextID(),
	bm->pixelRef());
	}
	}
	}

	return proxy;
	}

	///////////////////////////////////////////////////////////////////////////////

	SkPMColor4f SkColorToPMColor4f(SkColor c, const GrColorSpaceInfo& colorSpaceInfo) {
	SkColor4f color = SkColor4f::FromColor(c);
	if (auto* xform = colorSpaceInfo.colorSpaceXformFromSRGB()) {
	color = xform->apply(color);
	}
	return color.premul();
	}

	SkColor4f SkColor4fPrepForDst(SkColor4f color, const GrColorSpaceInfo& colorSpaceInfo) {
	if (auto* xform = colorSpaceInfo.colorSpaceXformFromSRGB()) {
	color = xform->apply(color);
	}
	return color;
	}

	///////////////////////////////////////////////////////////////////////////////

	GrPixelConfig SkColorType2GrPixelConfig(const SkColorType type) {
	switch (type) {
	case kUnknown_SkColorType:
	return kUnknown_GrPixelConfig;
	case kAlpha_8_SkColorType:
	return kAlpha_8_GrPixelConfig;
	case kRGB_565_SkColorType:
	return kRGB_565_GrPixelConfig;
	case kARGB_4444_SkColorType:
	return kRGBA_4444_GrPixelConfig;
	case kRGBA_8888_SkColorType:
	return kRGBA_8888_GrPixelConfig;
	case kRGB_888x_SkColorType:
	return kRGB_888_GrPixelConfig;
	case kBGRA_8888_SkColorType:
	return kBGRA_8888_GrPixelConfig;
	case kRGBA_1010102_SkColorType:
	return kRGBA_1010102_GrPixelConfig;
	case kRGB_101010x_SkColorType:
	return kUnknown_GrPixelConfig;
	case kGray_8_SkColorType:
	return kGray_8_GrPixelConfig;
	case kRGBA_F16Norm_SkColorType:
	return kRGBA_half_Clamped_GrPixelConfig;
	case kRGBA_F16_SkColorType:
	return kRGBA_half_GrPixelConfig;
	case kRGBA_F32_SkColorType:
	return kRGBA_float_GrPixelConfig;
	}
	SkASSERT(0); // shouldn't get here
	return kUnknown_GrPixelConfig;
	}

	GrPixelConfig SkImageInfo2GrPixelConfig(const SkImageInfo& info) {
	return SkColorType2GrPixelConfig(info.colorType());
	}

	bool GrPixelConfigToColorType(GrPixelConfig config, SkColorType* ctOut) {
	SkColorType ct = GrColorTypeToSkColorType(GrPixelConfigToColorType(config));
	if (kUnknown_SkColorType != ct) {
	if (ctOut) {
	*ctOut = ct;
	}
	return true;
	}
	return false;
	}

	////////////////////////////////////////////////////////////////////////////////////////////////

	static inline bool blend_requires_shader(const SkBlendMode mode) {
	return SkBlendMode::kDst != mode;
	}

	#ifndef SK_IGNORE_GPU_DITHER
	static inline int32_t dither_range_type_for_config(GrColorType dstColorType) {
	switch (dstColorType) {
	case GrColorType::kGray_8:
	case GrColorType::kRGBA_8888:
	case GrColorType::kRGB_888x:
	case GrColorType::kRG_88:
	case GrColorType::kBGRA_8888:
	case GrColorType::kR_16:
	case GrColorType::kRG_1616:
	// Experimental (for Y416 and mutant P016/P010)
	case GrColorType::kRGBA_16161616:
	case GrColorType::kRG_F16:
	return 0;
	case GrColorType::kBGR_565:
	return 1;
	case GrColorType::kABGR_4444:
	return 2;
	case GrColorType::kUnknown:
	case GrColorType::kRGBA_8888_SRGB:
	case GrColorType::kRGBA_1010102:
	case GrColorType::kAlpha_F16:
	case GrColorType::kRGBA_F32:
	case GrColorType::kRGBA_F16:
	case GrColorType::kRGBA_F16_Clamped:
	case GrColorType::kAlpha_8:
	return -1;
	}
	SkUNREACHABLE;
	}
	#endif

	static inline bool skpaint_to_grpaint_impl(GrRecordingContext* context,
	const GrColorSpaceInfo& colorSpaceInfo,
	const SkPaint& skPaint,
	const SkMatrix& viewM,
	std::unique_ptr<GrFragmentProcessor>* shaderProcessor,
	SkBlendMode* primColorMode,
	GrPaint* grPaint) {
	// Convert SkPaint color to 4f format in the destination color space
	SkColor4f origColor = SkColor4fPrepForDst(skPaint.getColor4f(), colorSpaceInfo);

	GrFPArgs fpArgs(context, &viewM, skPaint.getFilterQuality(), &colorSpaceInfo);

	// Setup the initial color considering the shader, the SkPaint color, and the presence or not
	// of per-vertex colors.
	std::unique_ptr<GrFragmentProcessor> shaderFP;
	if (!primColorMode \|\| blend_requires_shader(*primColorMode)) {
	fpArgs.fInputColorIsOpaque = origColor.isOpaque();
	if (shaderProcessor) {
	shaderFP = std::move(*shaderProcessor);
	} else if (const auto* shader = as_SB(skPaint.getShader())) {
	shaderFP = shader->asFragmentProcessor(fpArgs);
	if (!shaderFP) {
	return false;
	}
	}
	}

	// Set this in below cases if the output of the shader/paint-color/paint-alpha/primXfermode is
	// a known constant value. In that case we can simply apply a color filter during this
	// conversion without converting the color filter to a GrFragmentProcessor.
	bool applyColorFilterToPaintColor = false;
	if (shaderFP) {
	if (primColorMode) {
	// There is a blend between the primitive color and the shader color. The shader sees
	// the opaque paint color. The shader's output is blended using the provided mode by
	// the primitive color. The blended color is then modulated by the paint's alpha.

	// The geometry processor will insert the primitive color to start the color chain, so
	// the GrPaint color will be ignored.

	SkPMColor4f shaderInput = origColor.makeOpaque().premul();
	shaderFP = GrFragmentProcessor::OverrideInput(std::move(shaderFP), shaderInput);
	shaderFP = GrXfermodeFragmentProcessor::MakeFromSrcProcessor(std::move(shaderFP),
	*primColorMode);

	// The above may return null if compose results in a pass through of the prim color.
	if (shaderFP) {
	grPaint->addColorFragmentProcessor(std::move(shaderFP));
	}

	// We can ignore origColor here - alpha is unchanged by gamma
	float paintAlpha = skPaint.getColor4f().fA;
	if (1.0f != paintAlpha) {
	// No gamut conversion - paintAlpha is a (linear) alpha value, splatted to all
	// color channels. It's value should be treated as the same in ANY color space.
	grPaint->addColorFragmentProcessor(GrConstColorProcessor::Make(
	{ paintAlpha, paintAlpha, paintAlpha, paintAlpha },
	GrConstColorProcessor::InputMode::kModulateRGBA));
	}
	} else {
	// The shader's FP sees the paint unpremul color
	SkPMColor4f origColorAsPM = { origColor.fR, origColor.fG, origColor.fB, origColor.fA };
	grPaint->setColor4f(origColorAsPM);
	grPaint->addColorFragmentProcessor(std::move(shaderFP));
	}
	} else {
	if (primColorMode) {
	// There is a blend between the primitive color and the paint color. The blend considers
	// the opaque paint color. The paint's alpha is applied to the post-blended color.
	SkPMColor4f opaqueColor = origColor.makeOpaque().premul();
	auto processor = GrConstColorProcessor::Make(opaqueColor,
	GrConstColorProcessor::InputMode::kIgnore);
	processor = GrXfermodeFragmentProcessor::MakeFromSrcProcessor(std::move(processor),
	*primColorMode);
	if (processor) {
	grPaint->addColorFragmentProcessor(std::move(processor));
	}

	grPaint->setColor4f(opaqueColor);

	// We can ignore origColor here - alpha is unchanged by gamma
	float paintAlpha = skPaint.getColor4f().fA;
	if (1.0f != paintAlpha) {
	// No gamut conversion - paintAlpha is a (linear) alpha value, splatted to all
	// color channels. It's value should be treated as the same in ANY color space.
	grPaint->addColorFragmentProcessor(GrConstColorProcessor::Make(
	{ paintAlpha, paintAlpha, paintAlpha, paintAlpha },
	GrConstColorProcessor::InputMode::kModulateRGBA));
	}
	} else {
	// No shader, no primitive color.
	grPaint->setColor4f(origColor.premul());
	applyColorFilterToPaintColor = true;
	}
	}

	SkColorFilter* colorFilter = skPaint.getColorFilter();
	if (colorFilter) {
	if (applyColorFilterToPaintColor) {
	grPaint->setColor4f(
	colorFilter->filterColor4f(origColor, colorSpaceInfo.colorSpace()).premul());
	} else {
	auto cfFP = colorFilter->asFragmentProcessor(context, colorSpaceInfo);
	if (cfFP) {
	grPaint->addColorFragmentProcessor(std::move(cfFP));
	} else {
	return false;
	}
	}
	}

	SkMaskFilterBase* maskFilter = as_MFB(skPaint.getMaskFilter());
	if (maskFilter) {
	// We may have set this before passing to the SkShader.
	fpArgs.fInputColorIsOpaque = false;
	if (auto mfFP = maskFilter->asFragmentProcessor(fpArgs)) {
	grPaint->addCoverageFragmentProcessor(std::move(mfFP));
	}
	}

	// When the xfermode is null on the SkPaint (meaning kSrcOver) we need the XPFactory field on
	// the GrPaint to also be null (also kSrcOver).
	SkASSERT(!grPaint->getXPFactory());
	if (!skPaint.isSrcOver()) {
	grPaint->setXPFactory(SkBlendMode_AsXPFactory(skPaint.getBlendMode()));
	}

	#ifndef SK_IGNORE_GPU_DITHER
	// Conservative default, in case GrPixelConfigToColorType() fails.
	GrColorType ct = colorSpaceInfo.colorType();
	if (SkPaintPriv::ShouldDither(skPaint, GrColorTypeToSkColorType(ct)) &&
	grPaint->numColorFragmentProcessors() > 0) {
	int32_t ditherRange = dither_range_type_for_config(ct);
	if (ditherRange >= 0) {
	static int ditherIndex = GrSkSLFP::NewIndex();
	auto ditherFP = GrSkSLFP::Make(context, ditherIndex, "Dither", SKSL_DITHER_SRC,
	&ditherRange, sizeof(ditherRange));
	if (ditherFP) {
	grPaint->addColorFragmentProcessor(std::move(ditherFP));
	}
	}
	}
	#endif
	return true;
	}

	bool SkPaintToGrPaint(GrRecordingContext* context, const GrColorSpaceInfo& colorSpaceInfo,
	const SkPaint& skPaint, const SkMatrix& viewM, GrPaint* grPaint) {
	return skpaint_to_grpaint_impl(context, colorSpaceInfo, skPaint, viewM, nullptr, nullptr,
	grPaint);
	}

	/** Replaces the SkShader (if any) on skPaint with the passed in GrFragmentProcessor. */
	bool SkPaintToGrPaintReplaceShader(GrRecordingContext* context,
	const GrColorSpaceInfo& colorSpaceInfo,
	const SkPaint& skPaint,
	std::unique_ptr<GrFragmentProcessor> shaderFP,
	GrPaint* grPaint) {
	if (!shaderFP) {
	return false;
	}
	return skpaint_to_grpaint_impl(context, colorSpaceInfo, skPaint, SkMatrix::I(), &shaderFP,
	nullptr, grPaint);
	}

	/** Ignores the SkShader (if any) on skPaint. */
	bool SkPaintToGrPaintNoShader(GrRecordingContext* context,
	const GrColorSpaceInfo& colorSpaceInfo,
	const SkPaint& skPaint,
	GrPaint* grPaint) {
	// Use a ptr to a nullptr to to indicate that the SkShader is ignored and not replaced.
	std::unique_ptr<GrFragmentProcessor> nullShaderFP(nullptr);
	return skpaint_to_grpaint_impl(context, colorSpaceInfo, skPaint, SkMatrix::I(), &nullShaderFP,
	nullptr, grPaint);
	}

	/** Blends the SkPaint's shader (or color if no shader) with a per-primitive color which must
	be setup as a vertex attribute using the specified SkBlendMode. */
	bool SkPaintToGrPaintWithXfermode(GrRecordingContext* context,
	const GrColorSpaceInfo& colorSpaceInfo,
	const SkPaint& skPaint,
	const SkMatrix& viewM,
	SkBlendMode primColorMode,
	GrPaint* grPaint) {
	return skpaint_to_grpaint_impl(context, colorSpaceInfo, skPaint, viewM, nullptr, &primColorMode,
	grPaint);
	}

	bool SkPaintToGrPaintWithTexture(GrRecordingContext* context,
	const GrColorSpaceInfo& colorSpaceInfo,
	const SkPaint& paint,
	const SkMatrix& viewM,
	std::unique_ptr<GrFragmentProcessor> fp,
	bool textureIsAlphaOnly,
	GrPaint* grPaint) {
	std::unique_ptr<GrFragmentProcessor> shaderFP;
	if (textureIsAlphaOnly) {
	if (const auto* shader = as_SB(paint.getShader())) {
	shaderFP = shader->asFragmentProcessor(GrFPArgs(
	context, &viewM, paint.getFilterQuality(), &colorSpaceInfo));
	if (!shaderFP) {
	return false;
	}
	std::unique_ptr<GrFragmentProcessor> fpSeries[] = { std::move(shaderFP), std::move(fp) };
	shaderFP = GrFragmentProcessor::RunInSeries(fpSeries, 2);
	} else {
	shaderFP = GrFragmentProcessor::MakeInputPremulAndMulByOutput(std::move(fp));
	}
	} else {
	if (paint.getColor4f().isOpaque()) {
	shaderFP = GrFragmentProcessor::OverrideInput(std::move(fp), SK_PMColor4fWHITE, false);
	} else {
	shaderFP = GrFragmentProcessor::MulChildByInputAlpha(std::move(fp));
	}
	}

	return SkPaintToGrPaintReplaceShader(context, colorSpaceInfo, paint, std::move(shaderFP),
	grPaint);
	}


	////////////////////////////////////////////////////////////////////////////////////////////////

	GrSamplerState::Filter GrSkFilterQualityToGrFilterMode(SkFilterQuality paintFilterQuality,
	const SkMatrix& viewM,
	const SkMatrix& localM,
	bool sharpenMipmappedTextures,
	bool* doBicubic) {
	*doBicubic = false;
	GrSamplerState::Filter textureFilterMode;
	switch (paintFilterQuality) {
	case kNone_SkFilterQuality:
	textureFilterMode = GrSamplerState::Filter::kNearest;
	break;
	case kLow_SkFilterQuality:
	textureFilterMode = GrSamplerState::Filter::kBilerp;
	break;
	case kMedium_SkFilterQuality: {
	SkMatrix matrix;
	matrix.setConcat(viewM, localM);
	// With sharp mips, we bias lookups by -0.5. That means our final LOD is >= 0 until the
	// computed LOD is >= 0.5. At what scale factor does a texture get an LOD of 0.5?
	//
	// Want: 0 = log2(1/s) - 0.5
	// 0.5 = log2(1/s)
	// 2^0.5 = 1/s
	// 1/2^0.5 = s
	// 2^0.5/2 = s
	SkScalar mipScale = sharpenMipmappedTextures ? SK_ScalarRoot2Over2 : SK_Scalar1;
	if (matrix.getMinScale() < mipScale) {
	textureFilterMode = GrSamplerState::Filter::kMipMap;
	} else {
	// Don't trigger MIP level generation unnecessarily.
	textureFilterMode = GrSamplerState::Filter::kBilerp;
	}
	break;
	}
	case kHigh_SkFilterQuality: {
	SkMatrix matrix;
	matrix.setConcat(viewM, localM);
	*doBicubic = GrBicubicEffect::ShouldUseBicubic(matrix, &textureFilterMode);
	break;
	}
	default:
	// Should be unreachable. If not, fall back to mipmaps.
	textureFilterMode = GrSamplerState::Filter::kMipMap;
	break;

	}
	return textureFilterMode;
	}