| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkGpuDevice.h" |
| |
| #include "GrBlurUtils.h" |
| #include "GrCaps.h" |
| #include "GrDrawContext.h" |
| #include "GrStrokeInfo.h" |
| #include "GrTextureParamsAdjuster.h" |
| #include "SkDraw.h" |
| #include "SkGrPriv.h" |
| #include "SkMaskFilter.h" |
| #include "effects/GrBicubicEffect.h" |
| #include "effects/GrSimpleTextureEffect.h" |
| #include "effects/GrTextureDomain.h" |
| |
| static inline bool use_shader(bool textureIsAlphaOnly, const SkPaint& paint) { |
| return textureIsAlphaOnly && paint.getShader(); |
| } |
| |
| /** Determines how to combine the texture FP with the paint's color and SkShader, if any. */ |
| static const GrFragmentProcessor* mix_texture_fp_with_paint_color_and_shader( |
| const GrFragmentProcessor* textureFP, |
| bool textureIsAlphaOnly, |
| GrContext* context, |
| const SkMatrix& viewMatrix, |
| const SkPaint& paint) { |
| // According to the SkCanvas API, we only consider the shader if the bitmap or image being |
| // rendered is alpha-only. |
| if (textureIsAlphaOnly) { |
| if (const SkShader* shader = paint.getShader()) { |
| SkAutoTUnref<const GrFragmentProcessor> shaderFP( |
| shader->asFragmentProcessor(context, |
| viewMatrix, |
| nullptr, |
| paint.getFilterQuality())); |
| if (!shaderFP) { |
| return nullptr; |
| } |
| const GrFragmentProcessor* fpSeries[] = { shaderFP, textureFP }; |
| return GrFragmentProcessor::RunInSeries(fpSeries, 2); |
| } else { |
| return GrFragmentProcessor::MulOutputByInputUnpremulColor(textureFP); |
| } |
| } else { |
| return GrFragmentProcessor::MulOutputByInputAlpha(textureFP); |
| } |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // Helper functions for dropping src rect constraint in bilerp mode. |
| |
| static const SkScalar kColorBleedTolerance = 0.001f; |
| |
| static bool has_aligned_samples(const SkRect& srcRect, const SkRect& transformedRect) { |
| // detect pixel disalignment |
| if (SkScalarAbs(SkScalarRoundToScalar(transformedRect.left()) - transformedRect.left()) < kColorBleedTolerance && |
| SkScalarAbs(SkScalarRoundToScalar(transformedRect.top()) - transformedRect.top()) < kColorBleedTolerance && |
| SkScalarAbs(transformedRect.width() - srcRect.width()) < kColorBleedTolerance && |
| SkScalarAbs(transformedRect.height() - srcRect.height()) < kColorBleedTolerance) { |
| return true; |
| } |
| return false; |
| } |
| |
| static bool may_color_bleed(const SkRect& srcRect, |
| const SkRect& transformedRect, |
| const SkMatrix& m, |
| bool isMSAA) { |
| // Only gets called if has_aligned_samples returned false. |
| // So we can assume that sampling is axis aligned but not texel aligned. |
| SkASSERT(!has_aligned_samples(srcRect, transformedRect)); |
| SkRect innerSrcRect(srcRect), innerTransformedRect, outerTransformedRect(transformedRect); |
| if (isMSAA) { |
| innerSrcRect.inset(SK_Scalar1, SK_Scalar1); |
| } else { |
| innerSrcRect.inset(SK_ScalarHalf, SK_ScalarHalf); |
| } |
| m.mapRect(&innerTransformedRect, innerSrcRect); |
| |
| // The gap between outerTransformedRect and innerTransformedRect |
| // represents the projection of the source border area, which is |
| // problematic for color bleeding. We must check whether any |
| // destination pixels sample the border area. |
| outerTransformedRect.inset(kColorBleedTolerance, kColorBleedTolerance); |
| innerTransformedRect.outset(kColorBleedTolerance, kColorBleedTolerance); |
| SkIRect outer, inner; |
| outerTransformedRect.round(&outer); |
| innerTransformedRect.round(&inner); |
| // If the inner and outer rects round to the same result, it means the |
| // border does not overlap any pixel centers. Yay! |
| return inner != outer; |
| } |
| |
| static bool can_ignore_bilerp_constraint(const GrTextureProducer& producer, |
| const SkRect& srcRect, |
| const SkMatrix& srcRectToDeviceSpace, |
| bool isMSAA) { |
| if (srcRectToDeviceSpace.rectStaysRect()) { |
| // sampling is axis-aligned |
| SkRect transformedRect; |
| srcRectToDeviceSpace.mapRect(&transformedRect, srcRect); |
| |
| if (has_aligned_samples(srcRect, transformedRect) || |
| !may_color_bleed(srcRect, transformedRect, srcRectToDeviceSpace, isMSAA)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| void SkGpuDevice::drawTextureProducer(GrTextureProducer* producer, |
| bool alphaOnly, |
| const SkRect* srcRect, |
| const SkRect* dstRect, |
| SkCanvas::SrcRectConstraint constraint, |
| const SkMatrix& viewMatrix, |
| const GrClip& clip, |
| const SkPaint& paint) { |
| // Figure out the actual dst and src rect by clipping the src rect to the bounds of the |
| // adjuster. If the src rect is clipped then the dst rect must be recomputed. Also determine |
| // the matrix that maps the src rect to the dst rect. |
| SkRect clippedSrcRect; |
| SkRect clippedDstRect; |
| const SkRect srcBounds = SkRect::MakeIWH(producer->width(), producer->height()); |
| SkMatrix srcToDstMatrix; |
| if (srcRect) { |
| if (!dstRect) { |
| dstRect = &srcBounds; |
| } |
| if (!srcBounds.contains(*srcRect)) { |
| clippedSrcRect = *srcRect; |
| if (!clippedSrcRect.intersect(srcBounds)) { |
| return; |
| } |
| if (!srcToDstMatrix.setRectToRect(*srcRect, *dstRect, SkMatrix::kFill_ScaleToFit)) { |
| return; |
| } |
| srcToDstMatrix.mapRect(&clippedDstRect, clippedSrcRect); |
| } else { |
| clippedSrcRect = *srcRect; |
| clippedDstRect = *dstRect; |
| if (!srcToDstMatrix.setRectToRect(*srcRect, *dstRect, SkMatrix::kFill_ScaleToFit)) { |
| return; |
| } |
| } |
| } else { |
| clippedSrcRect = srcBounds; |
| if (dstRect) { |
| clippedDstRect = *dstRect; |
| if (!srcToDstMatrix.setRectToRect(srcBounds, *dstRect, SkMatrix::kFill_ScaleToFit)) { |
| return; |
| } |
| } else { |
| clippedDstRect = srcBounds; |
| srcToDstMatrix.reset(); |
| } |
| } |
| |
| this->drawTextureProducerImpl(producer, alphaOnly, clippedSrcRect, clippedDstRect, constraint, |
| viewMatrix, srcToDstMatrix, clip, paint); |
| } |
| |
| void SkGpuDevice::drawTextureProducerImpl(GrTextureProducer* producer, |
| bool alphaTexture, |
| const SkRect& clippedSrcRect, |
| const SkRect& clippedDstRect, |
| SkCanvas::SrcRectConstraint constraint, |
| const SkMatrix& viewMatrix, |
| const SkMatrix& srcToDstMatrix, |
| const GrClip& clip, |
| const SkPaint& paint) { |
| // Specifying the texture coords as local coordinates is an attempt to enable more batching |
| // by not baking anything about the srcRect, dstRect, or viewMatrix, into the texture FP. In |
| // the future this should be an opaque optimization enabled by the combination of batch/GP and |
| // FP. |
| const SkMaskFilter* mf = paint.getMaskFilter(); |
| // The shader expects proper local coords, so we can't replace local coords with texture coords |
| // if the shader will be used. If we have a mask filter we will change the underlying geometry |
| // that is rendered. |
| bool canUseTextureCoordsAsLocalCoords = !use_shader(alphaTexture, paint) && !mf; |
| |
| bool doBicubic; |
| GrTextureParams::FilterMode fm = |
| GrSkFilterQualityToGrFilterMode(paint.getFilterQuality(), viewMatrix, srcToDstMatrix, |
| &doBicubic); |
| const GrTextureParams::FilterMode* filterMode = doBicubic ? nullptr : &fm; |
| |
| GrTextureAdjuster::FilterConstraint constraintMode; |
| if (SkCanvas::kFast_SrcRectConstraint == constraint) { |
| constraintMode = GrTextureAdjuster::kNo_FilterConstraint; |
| } else { |
| constraintMode = GrTextureAdjuster::kYes_FilterConstraint; |
| } |
| |
| // If we have to outset for AA then we will generate texture coords outside the src rect. The |
| // same happens for any mask filter that extends the bounds rendered in the dst. |
| // This is conservative as a mask filter does not have to expand the bounds rendered. |
| bool coordsAllInsideSrcRect = !paint.isAntiAlias() && !mf; |
| |
| // Check for optimization to drop the src rect constraint when on bilerp. |
| if (filterMode && GrTextureParams::kBilerp_FilterMode == *filterMode && |
| GrTextureAdjuster::kYes_FilterConstraint == constraintMode && coordsAllInsideSrcRect) { |
| SkMatrix combinedMatrix; |
| combinedMatrix.setConcat(viewMatrix, srcToDstMatrix); |
| if (can_ignore_bilerp_constraint(*producer, clippedSrcRect, combinedMatrix, |
| fRenderTarget->isUnifiedMultisampled())) { |
| constraintMode = GrTextureAdjuster::kNo_FilterConstraint; |
| } |
| } |
| |
| const SkMatrix* textureMatrix; |
| SkMatrix tempMatrix; |
| if (canUseTextureCoordsAsLocalCoords) { |
| textureMatrix = &SkMatrix::I(); |
| } else { |
| if (!srcToDstMatrix.invert(&tempMatrix)) { |
| return; |
| } |
| textureMatrix = &tempMatrix; |
| } |
| SkAutoTUnref<const GrFragmentProcessor> fp(producer->createFragmentProcessor( |
| *textureMatrix, clippedSrcRect, constraintMode, coordsAllInsideSrcRect, filterMode)); |
| if (!fp) { |
| return; |
| } |
| fp.reset(mix_texture_fp_with_paint_color_and_shader(fp, alphaTexture, this->context(), |
| viewMatrix, paint)); |
| GrPaint grPaint; |
| if (!SkPaintToGrPaintReplaceShader(fContext, paint, fp, &grPaint)) { |
| return; |
| } |
| |
| if (canUseTextureCoordsAsLocalCoords) { |
| fDrawContext->fillRectToRect(clip, grPaint, viewMatrix, clippedDstRect, clippedSrcRect); |
| return; |
| } |
| |
| if (!mf) { |
| fDrawContext->drawRect(clip, grPaint, viewMatrix, clippedDstRect); |
| return; |
| } |
| |
| // First see if we can do the draw + mask filter direct to the dst. |
| SkStrokeRec rec(SkStrokeRec::kFill_InitStyle); |
| SkRRect rrect; |
| rrect.setRect(clippedDstRect); |
| if (mf->directFilterRRectMaskGPU(fContext->textureProvider(), |
| fDrawContext, |
| &grPaint, |
| clip, |
| viewMatrix, |
| rec, |
| rrect)) { |
| return; |
| } |
| SkPath rectPath; |
| rectPath.addRect(clippedDstRect); |
| GrBlurUtils::drawPathWithMaskFilter(this->context(), fDrawContext, fRenderTarget, fClip, |
| rectPath, &grPaint, viewMatrix, mf, paint.getPathEffect(), |
| GrStrokeInfo::FillInfo()); |
| } |