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Unified Diff: src/effects/SkBlurImageFilter.cpp

Issue 2255803003: Moving SkBlurImageFilter into core (Closed) Base URL: https://skia.googlesource.com/skia@master
Patch Set: ... made req changes onto correct branch Created 4 years, 4 months ago
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Index: src/effects/SkBlurImageFilter.cpp
diff --git a/src/effects/SkBlurImageFilter.cpp b/src/effects/SkBlurImageFilter.cpp
deleted file mode 100644
index 37584ab3add0eb1ecbb731234e61a2a8d65846e9..0000000000000000000000000000000000000000
--- a/src/effects/SkBlurImageFilter.cpp
+++ /dev/null
@@ -1,259 +0,0 @@
-/*
- * Copyright 2011 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 "SkBlurImageFilter.h"
-
-#include "SkAutoPixmapStorage.h"
-#include "SkColorPriv.h"
-#include "SkGpuBlurUtils.h"
-#include "SkOpts.h"
-#include "SkReadBuffer.h"
-#include "SkSpecialImage.h"
-#include "SkWriteBuffer.h"
-
-#if SK_SUPPORT_GPU
-#include "GrContext.h"
-#include "SkGr.h"
-#endif
-
-sk_sp<SkImageFilter> SkBlurImageFilter::Make(SkScalar sigmaX, SkScalar sigmaY,
- sk_sp<SkImageFilter> input,
- const CropRect* cropRect) {
- if (0 == sigmaX && 0 == sigmaY && !cropRect) {
- return input;
- }
- return sk_sp<SkImageFilter>(new SkBlurImageFilter(sigmaX, sigmaY, input, cropRect));
-}
-
-// This rather arbitrary-looking value results in a maximum box blur kernel size
-// of 1000 pixels on the raster path, which matches the WebKit and Firefox
-// implementations. Since the GPU path does not compute a box blur, putting
-// the limit on sigma ensures consistent behaviour between the GPU and
-// raster paths.
-#define MAX_SIGMA SkIntToScalar(532)
-
-static SkVector map_sigma(const SkSize& localSigma, const SkMatrix& ctm) {
- SkVector sigma = SkVector::Make(localSigma.width(), localSigma.height());
- ctm.mapVectors(&sigma, 1);
- sigma.fX = SkMinScalar(SkScalarAbs(sigma.fX), MAX_SIGMA);
- sigma.fY = SkMinScalar(SkScalarAbs(sigma.fY), MAX_SIGMA);
- return sigma;
-}
-
-SkBlurImageFilter::SkBlurImageFilter(SkScalar sigmaX,
- SkScalar sigmaY,
- sk_sp<SkImageFilter> input,
- const CropRect* cropRect)
- : INHERITED(&input, 1, cropRect)
- , fSigma(SkSize::Make(sigmaX, sigmaY)) {
-}
-
-sk_sp<SkFlattenable> SkBlurImageFilter::CreateProc(SkReadBuffer& buffer) {
- SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
- SkScalar sigmaX = buffer.readScalar();
- SkScalar sigmaY = buffer.readScalar();
- return Make(sigmaX, sigmaY, common.getInput(0), &common.cropRect());
-}
-
-void SkBlurImageFilter::flatten(SkWriteBuffer& buffer) const {
- this->INHERITED::flatten(buffer);
- buffer.writeScalar(fSigma.fWidth);
- buffer.writeScalar(fSigma.fHeight);
-}
-
-static void get_box3_params(SkScalar s, int *kernelSize, int* kernelSize3, int *lowOffset,
- int *highOffset) {
- float pi = SkScalarToFloat(SK_ScalarPI);
- int d = static_cast<int>(floorf(SkScalarToFloat(s) * 3.0f * sqrtf(2.0f * pi) / 4.0f + 0.5f));
- *kernelSize = d;
- if (d % 2 == 1) {
- *lowOffset = *highOffset = (d - 1) / 2;
- *kernelSize3 = d;
- } else {
- *highOffset = d / 2;
- *lowOffset = *highOffset - 1;
- *kernelSize3 = d + 1;
- }
-}
-
-sk_sp<SkSpecialImage> SkBlurImageFilter::onFilterImage(SkSpecialImage* source,
- const Context& ctx,
- SkIPoint* offset) const {
- SkIPoint inputOffset = SkIPoint::Make(0, 0);
-
- sk_sp<SkSpecialImage> input(this->filterInput(0, source, ctx, &inputOffset));
- if (!input) {
- return nullptr;
- }
-
- SkIRect inputBounds = SkIRect::MakeXYWH(inputOffset.fX, inputOffset.fY,
- input->width(), input->height());
-
- SkIRect dstBounds;
- if (!this->applyCropRect(this->mapContext(ctx), inputBounds, &dstBounds)) {
- return nullptr;
- }
- if (!inputBounds.intersect(dstBounds)) {
- return nullptr;
- }
-
- const SkVector sigma = map_sigma(fSigma, ctx.ctm());
-
-#if SK_SUPPORT_GPU
- if (source->isTextureBacked()) {
- GrContext* context = source->getContext();
- sk_sp<GrTexture> inputTexture(input->asTextureRef(context));
- SkASSERT(inputTexture);
-
- if (0 == sigma.x() && 0 == sigma.y()) {
- offset->fX = inputBounds.x();
- offset->fY = inputBounds.y();
- return input->makeSubset(inputBounds.makeOffset(-inputOffset.x(),
- -inputOffset.y()));
- }
-
- offset->fX = dstBounds.fLeft;
- offset->fY = dstBounds.fTop;
- inputBounds.offset(-inputOffset);
- dstBounds.offset(-inputOffset);
- sk_sp<GrDrawContext> drawContext(SkGpuBlurUtils::GaussianBlur(
- context,
- inputTexture.get(),
- sk_ref_sp(source->getColorSpace()),
- dstBounds,
- &inputBounds,
- sigma.x(),
- sigma.y()));
- if (!drawContext) {
- return nullptr;
- }
-
- // TODO: Get the colorSpace from the drawContext (once it has one)
- return SkSpecialImage::MakeFromGpu(SkIRect::MakeWH(dstBounds.width(), dstBounds.height()),
- kNeedNewImageUniqueID_SpecialImage,
- drawContext->asTexture(),
- sk_ref_sp(input->getColorSpace()), &source->props());
- }
-#endif
-
- int kernelSizeX, kernelSizeX3, lowOffsetX, highOffsetX;
- int kernelSizeY, kernelSizeY3, lowOffsetY, highOffsetY;
- get_box3_params(sigma.x(), &kernelSizeX, &kernelSizeX3, &lowOffsetX, &highOffsetX);
- get_box3_params(sigma.y(), &kernelSizeY, &kernelSizeY3, &lowOffsetY, &highOffsetY);
-
- if (kernelSizeX < 0 || kernelSizeY < 0) {
- return nullptr;
- }
-
- if (kernelSizeX == 0 && kernelSizeY == 0) {
- offset->fX = inputBounds.x();
- offset->fY = inputBounds.y();
- return input->makeSubset(inputBounds.makeOffset(-inputOffset.x(),
- -inputOffset.y()));
- }
-
- SkBitmap inputBM;
-
- if (!input->getROPixels(&inputBM)) {
- return nullptr;
- }
-
- if (inputBM.colorType() != kN32_SkColorType) {
- return nullptr;
- }
-
- SkImageInfo info = SkImageInfo::Make(dstBounds.width(), dstBounds.height(),
- inputBM.colorType(), inputBM.alphaType());
-
- SkBitmap tmp, dst;
- if (!tmp.tryAllocPixels(info) || !dst.tryAllocPixels(info)) {
- return nullptr;
- }
-
- SkAutoLockPixels inputLock(inputBM), tmpLock(tmp), dstLock(dst);
-
- offset->fX = dstBounds.fLeft;
- offset->fY = dstBounds.fTop;
- SkPMColor* t = tmp.getAddr32(0, 0);
- SkPMColor* d = dst.getAddr32(0, 0);
- int w = dstBounds.width(), h = dstBounds.height();
- const SkPMColor* s = inputBM.getAddr32(inputBounds.x() - inputOffset.x(),
- inputBounds.y() - inputOffset.y());
- inputBounds.offset(-dstBounds.x(), -dstBounds.y());
- dstBounds.offset(-dstBounds.x(), -dstBounds.y());
- SkIRect inputBoundsT = SkIRect::MakeLTRB(inputBounds.top(), inputBounds.left(),
- inputBounds.bottom(), inputBounds.right());
- SkIRect dstBoundsT = SkIRect::MakeWH(dstBounds.height(), dstBounds.width());
- int sw = int(inputBM.rowBytes() >> 2);
-
- /**
- *
- * In order to make memory accesses cache-friendly, we reorder the passes to
- * use contiguous memory reads wherever possible.
- *
- * For example, the 6 passes of the X-and-Y blur case are rewritten as
- * follows. Instead of 3 passes in X and 3 passes in Y, we perform
- * 2 passes in X, 1 pass in X transposed to Y on write, 2 passes in X,
- * then 1 pass in X transposed to Y on write.
- *
- * +----+ +----+ +----+ +---+ +---+ +---+ +----+
- * + AB + ----> | AB | ----> | AB | -----> | A | ----> | A | ----> | A | -----> | AB |
- * +----+ blurX +----+ blurX +----+ blurXY | B | blurX | B | blurX | B | blurXY +----+
- * +---+ +---+ +---+
- *
- * In this way, two of the y-blurs become x-blurs applied to transposed
- * images, and all memory reads are contiguous.
- */
- if (kernelSizeX > 0 && kernelSizeY > 0) {
- SkOpts::box_blur_xx(s, sw, inputBounds, t, kernelSizeX, lowOffsetX, highOffsetX, w, h);
- SkOpts::box_blur_xx(t, w, dstBounds, d, kernelSizeX, highOffsetX, lowOffsetX, w, h);
- SkOpts::box_blur_xy(d, w, dstBounds, t, kernelSizeX3, highOffsetX, highOffsetX, w, h);
- SkOpts::box_blur_xx(t, h, dstBoundsT, d, kernelSizeY, lowOffsetY, highOffsetY, h, w);
- SkOpts::box_blur_xx(d, h, dstBoundsT, t, kernelSizeY, highOffsetY, lowOffsetY, h, w);
- SkOpts::box_blur_xy(t, h, dstBoundsT, d, kernelSizeY3, highOffsetY, highOffsetY, h, w);
- } else if (kernelSizeX > 0) {
- SkOpts::box_blur_xx(s, sw, inputBounds, d, kernelSizeX, lowOffsetX, highOffsetX, w, h);
- SkOpts::box_blur_xx(d, w, dstBounds, t, kernelSizeX, highOffsetX, lowOffsetX, w, h);
- SkOpts::box_blur_xx(t, w, dstBounds, d, kernelSizeX3, highOffsetX, highOffsetX, w, h);
- } else if (kernelSizeY > 0) {
- SkOpts::box_blur_yx(s, sw, inputBoundsT, d, kernelSizeY, lowOffsetY, highOffsetY, h, w);
- SkOpts::box_blur_xx(d, h, dstBoundsT, t, kernelSizeY, highOffsetY, lowOffsetY, h, w);
- SkOpts::box_blur_xy(t, h, dstBoundsT, d, kernelSizeY3, highOffsetY, highOffsetY, h, w);
- }
-
- return SkSpecialImage::MakeFromRaster(SkIRect::MakeWH(dstBounds.width(),
- dstBounds.height()),
- dst, &source->props());
-}
-
-
-SkRect SkBlurImageFilter::computeFastBounds(const SkRect& src) const {
- SkRect bounds = this->getInput(0) ? this->getInput(0)->computeFastBounds(src) : src;
- bounds.outset(SkScalarMul(fSigma.width(), SkIntToScalar(3)),
- SkScalarMul(fSigma.height(), SkIntToScalar(3)));
- return bounds;
-}
-
-SkIRect SkBlurImageFilter::onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm,
- MapDirection) const {
- SkVector sigma = map_sigma(fSigma, ctm);
- return src.makeOutset(SkScalarCeilToInt(SkScalarMul(sigma.x(), SkIntToScalar(3))),
- SkScalarCeilToInt(SkScalarMul(sigma.y(), SkIntToScalar(3))));
-}
-
-#ifndef SK_IGNORE_TO_STRING
-void SkBlurImageFilter::toString(SkString* str) const {
- str->appendf("SkBlurImageFilter: (");
- str->appendf("sigma: (%f, %f) input (", fSigma.fWidth, fSigma.fHeight);
-
- if (this->getInput(0)) {
- this->getInput(0)->toString(str);
- }
-
- str->append("))");
-}
-#endif
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