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- /*
- * 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 "include/core/SkBitmap.h"
- #include "include/core/SkRect.h"
- #include "include/core/SkUnPreMultiply.h"
- #include "include/effects/SkMatrixConvolutionImageFilter.h"
- #include "include/private/SkColorData.h"
- #include "src/core/SkImageFilterPriv.h"
- #include "src/core/SkReadBuffer.h"
- #include "src/core/SkSpecialImage.h"
- #include "src/core/SkWriteBuffer.h"
- #if SK_SUPPORT_GPU
- #include "include/gpu/GrContext.h"
- #include "src/gpu/GrTextureProxy.h"
- #include "src/gpu/effects/GrMatrixConvolutionEffect.h"
- #endif
- // We need to be able to read at most SK_MaxS32 bytes, so divide that
- // by the size of a scalar to know how many scalars we can read.
- static const int32_t gMaxKernelSize = SK_MaxS32 / sizeof(SkScalar);
- SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(const SkISize& kernelSize,
- const SkScalar* kernel,
- SkScalar gain,
- SkScalar bias,
- const SkIPoint& kernelOffset,
- TileMode tileMode,
- bool convolveAlpha,
- sk_sp<SkImageFilter> input,
- const CropRect* cropRect)
- : INHERITED(&input, 1, cropRect)
- , fKernelSize(kernelSize)
- , fGain(gain)
- , fBias(bias)
- , fKernelOffset(kernelOffset)
- , fTileMode(tileMode)
- , fConvolveAlpha(convolveAlpha) {
- size_t size = (size_t) sk_64_mul(fKernelSize.width(), fKernelSize.height());
- fKernel = new SkScalar[size];
- memcpy(fKernel, kernel, size * sizeof(SkScalar));
- SkASSERT(kernelSize.fWidth >= 1 && kernelSize.fHeight >= 1);
- SkASSERT(kernelOffset.fX >= 0 && kernelOffset.fX < kernelSize.fWidth);
- SkASSERT(kernelOffset.fY >= 0 && kernelOffset.fY < kernelSize.fHeight);
- }
- sk_sp<SkImageFilter> SkMatrixConvolutionImageFilter::Make(const SkISize& kernelSize,
- const SkScalar* kernel,
- SkScalar gain,
- SkScalar bias,
- const SkIPoint& kernelOffset,
- TileMode tileMode,
- bool convolveAlpha,
- sk_sp<SkImageFilter> input,
- const CropRect* cropRect) {
- if (kernelSize.width() < 1 || kernelSize.height() < 1) {
- return nullptr;
- }
- if (gMaxKernelSize / kernelSize.fWidth < kernelSize.fHeight) {
- return nullptr;
- }
- if (!kernel) {
- return nullptr;
- }
- if ((kernelOffset.fX < 0) || (kernelOffset.fX >= kernelSize.fWidth) ||
- (kernelOffset.fY < 0) || (kernelOffset.fY >= kernelSize.fHeight)) {
- return nullptr;
- }
- return sk_sp<SkImageFilter>(new SkMatrixConvolutionImageFilter(kernelSize, kernel, gain,
- bias, kernelOffset,
- tileMode, convolveAlpha,
- std::move(input), cropRect));
- }
- sk_sp<SkFlattenable> SkMatrixConvolutionImageFilter::CreateProc(SkReadBuffer& buffer) {
- SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
- SkISize kernelSize;
- kernelSize.fWidth = buffer.readInt();
- kernelSize.fHeight = buffer.readInt();
- const int count = buffer.getArrayCount();
- const int64_t kernelArea = sk_64_mul(kernelSize.width(), kernelSize.height());
- if (!buffer.validate(kernelArea == count)) {
- return nullptr;
- }
- if (!buffer.validateCanReadN<SkScalar>(count)) {
- return nullptr;
- }
- SkAutoSTArray<16, SkScalar> kernel(count);
- if (!buffer.readScalarArray(kernel.get(), count)) {
- return nullptr;
- }
- SkScalar gain = buffer.readScalar();
- SkScalar bias = buffer.readScalar();
- SkIPoint kernelOffset;
- kernelOffset.fX = buffer.readInt();
- kernelOffset.fY = buffer.readInt();
- TileMode tileMode = buffer.read32LE(kLast_TileMode);
- bool convolveAlpha = buffer.readBool();
- if (!buffer.isValid()) {
- return nullptr;
- }
- return Make(kernelSize, kernel.get(), gain, bias, kernelOffset, tileMode,
- convolveAlpha, common.getInput(0), &common.cropRect());
- }
- void SkMatrixConvolutionImageFilter::flatten(SkWriteBuffer& buffer) const {
- this->INHERITED::flatten(buffer);
- buffer.writeInt(fKernelSize.fWidth);
- buffer.writeInt(fKernelSize.fHeight);
- buffer.writeScalarArray(fKernel, fKernelSize.fWidth * fKernelSize.fHeight);
- buffer.writeScalar(fGain);
- buffer.writeScalar(fBias);
- buffer.writeInt(fKernelOffset.fX);
- buffer.writeInt(fKernelOffset.fY);
- buffer.writeInt((int) fTileMode);
- buffer.writeBool(fConvolveAlpha);
- }
- SkMatrixConvolutionImageFilter::~SkMatrixConvolutionImageFilter() {
- delete[] fKernel;
- }
- class UncheckedPixelFetcher {
- public:
- static inline SkPMColor fetch(const SkBitmap& src, int x, int y, const SkIRect& bounds) {
- return *src.getAddr32(x, y);
- }
- };
- class ClampPixelFetcher {
- public:
- static inline SkPMColor fetch(const SkBitmap& src, int x, int y, const SkIRect& bounds) {
- x = SkTPin(x, bounds.fLeft, bounds.fRight - 1);
- y = SkTPin(y, bounds.fTop, bounds.fBottom - 1);
- return *src.getAddr32(x, y);
- }
- };
- class RepeatPixelFetcher {
- public:
- static inline SkPMColor fetch(const SkBitmap& src, int x, int y, const SkIRect& bounds) {
- x = (x - bounds.left()) % bounds.width() + bounds.left();
- y = (y - bounds.top()) % bounds.height() + bounds.top();
- if (x < bounds.left()) {
- x += bounds.width();
- }
- if (y < bounds.top()) {
- y += bounds.height();
- }
- return *src.getAddr32(x, y);
- }
- };
- class ClampToBlackPixelFetcher {
- public:
- static inline SkPMColor fetch(const SkBitmap& src, int x, int y, const SkIRect& bounds) {
- if (x < bounds.fLeft || x >= bounds.fRight || y < bounds.fTop || y >= bounds.fBottom) {
- return 0;
- } else {
- return *src.getAddr32(x, y);
- }
- }
- };
- template<class PixelFetcher, bool convolveAlpha>
- void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src,
- SkBitmap* result,
- SkIVector& offset,
- const SkIRect& r,
- const SkIRect& bounds) const {
- SkIRect rect(r);
- if (!rect.intersect(bounds)) {
- return;
- }
- for (int y = rect.fTop; y < rect.fBottom; ++y) {
- SkPMColor* dptr = result->getAddr32(rect.fLeft - offset.fX, y - offset.fY);
- for (int x = rect.fLeft; x < rect.fRight; ++x) {
- SkScalar sumA = 0, sumR = 0, sumG = 0, sumB = 0;
- for (int cy = 0; cy < fKernelSize.fHeight; cy++) {
- for (int cx = 0; cx < fKernelSize.fWidth; cx++) {
- SkPMColor s = PixelFetcher::fetch(src,
- x + cx - fKernelOffset.fX,
- y + cy - fKernelOffset.fY,
- bounds);
- SkScalar k = fKernel[cy * fKernelSize.fWidth + cx];
- if (convolveAlpha) {
- sumA += SkGetPackedA32(s) * k;
- }
- sumR += SkGetPackedR32(s) * k;
- sumG += SkGetPackedG32(s) * k;
- sumB += SkGetPackedB32(s) * k;
- }
- }
- int a = convolveAlpha
- ? SkClampMax(SkScalarFloorToInt(sumA * fGain + fBias), 255)
- : 255;
- int r = SkClampMax(SkScalarFloorToInt(sumR * fGain + fBias), a);
- int g = SkClampMax(SkScalarFloorToInt(sumG * fGain + fBias), a);
- int b = SkClampMax(SkScalarFloorToInt(sumB * fGain + fBias), a);
- if (!convolveAlpha) {
- a = SkGetPackedA32(PixelFetcher::fetch(src, x, y, bounds));
- *dptr++ = SkPreMultiplyARGB(a, r, g, b);
- } else {
- *dptr++ = SkPackARGB32(a, r, g, b);
- }
- }
- }
- }
- template<class PixelFetcher>
- void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src,
- SkBitmap* result,
- SkIVector& offset,
- const SkIRect& rect,
- const SkIRect& bounds) const {
- if (fConvolveAlpha) {
- filterPixels<PixelFetcher, true>(src, result, offset, rect, bounds);
- } else {
- filterPixels<PixelFetcher, false>(src, result, offset, rect, bounds);
- }
- }
- void SkMatrixConvolutionImageFilter::filterInteriorPixels(const SkBitmap& src,
- SkBitmap* result,
- SkIVector& offset,
- const SkIRect& rect,
- const SkIRect& bounds) const {
- switch (fTileMode) {
- case kRepeat_TileMode:
- // In repeat mode, we still need to wrap the samples around the src
- filterPixels<RepeatPixelFetcher>(src, result, offset, rect, bounds);
- break;
- case kClamp_TileMode:
- case kClampToBlack_TileMode:
- filterPixels<UncheckedPixelFetcher>(src, result, offset, rect, bounds);
- break;
- }
- }
- void SkMatrixConvolutionImageFilter::filterBorderPixels(const SkBitmap& src,
- SkBitmap* result,
- SkIVector& offset,
- const SkIRect& rect,
- const SkIRect& srcBounds) const {
- switch (fTileMode) {
- case kClamp_TileMode:
- filterPixels<ClampPixelFetcher>(src, result, offset, rect, srcBounds);
- break;
- case kRepeat_TileMode:
- filterPixels<RepeatPixelFetcher>(src, result, offset, rect, srcBounds);
- break;
- case kClampToBlack_TileMode:
- filterPixels<ClampToBlackPixelFetcher>(src, result, offset, rect, srcBounds);
- break;
- }
- }
- // FIXME: This should be refactored to SkImageFilterUtils for
- // use by other filters. For now, we assume the input is always
- // premultiplied and unpremultiply it
- static SkBitmap unpremultiply_bitmap(const SkBitmap& src) {
- if (!src.getPixels()) {
- return SkBitmap();
- }
- const SkImageInfo info = SkImageInfo::MakeN32(src.width(), src.height(), src.alphaType());
- SkBitmap result;
- if (!result.tryAllocPixels(info)) {
- return SkBitmap();
- }
- for (int y = 0; y < src.height(); ++y) {
- const uint32_t* srcRow = src.getAddr32(0, y);
- uint32_t* dstRow = result.getAddr32(0, y);
- for (int x = 0; x < src.width(); ++x) {
- dstRow[x] = SkUnPreMultiply::PMColorToColor(srcRow[x]);
- }
- }
- return result;
- }
- #if SK_SUPPORT_GPU
- static GrTextureDomain::Mode convert_tilemodes(SkMatrixConvolutionImageFilter::TileMode tileMode) {
- switch (tileMode) {
- case SkMatrixConvolutionImageFilter::kClamp_TileMode:
- return GrTextureDomain::kClamp_Mode;
- case SkMatrixConvolutionImageFilter::kRepeat_TileMode:
- return GrTextureDomain::kRepeat_Mode;
- case SkMatrixConvolutionImageFilter::kClampToBlack_TileMode:
- return GrTextureDomain::kDecal_Mode;
- default:
- SkASSERT(false);
- }
- return GrTextureDomain::kIgnore_Mode;
- }
- #endif
- sk_sp<SkSpecialImage> SkMatrixConvolutionImageFilter::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 dstBounds;
- input = this->applyCropRectAndPad(this->mapContext(ctx), input.get(), &inputOffset, &dstBounds);
- if (!input) {
- return nullptr;
- }
- const SkIRect originalSrcBounds = SkIRect::MakeXYWH(inputOffset.fX, inputOffset.fY,
- input->width(), input->height());
- SkIRect srcBounds = this->onFilterNodeBounds(dstBounds, ctx.ctm(), kReverse_MapDirection,
- &originalSrcBounds);
- if (kRepeat_TileMode == fTileMode) {
- srcBounds = DetermineRepeatedSrcBound(srcBounds, fKernelOffset,
- fKernelSize, originalSrcBounds);
- } else {
- if (!srcBounds.intersect(dstBounds)) {
- return nullptr;
- }
- }
- #if SK_SUPPORT_GPU
- // Note: if the kernel is too big, the GPU path falls back to SW
- if (source->isTextureBacked() &&
- fKernelSize.width() * fKernelSize.height() <= MAX_KERNEL_SIZE) {
- auto context = source->getContext();
- // Ensure the input is in the destination color space. Typically applyCropRect will have
- // called pad_image to account for our dilation of bounds, so the result will already be
- // moved to the destination color space. If a filter DAG avoids that, then we use this
- // fall-back, which saves us from having to do the xform during the filter itself.
- input = ImageToColorSpace(input.get(), ctx.outputProperties());
- sk_sp<GrTextureProxy> inputProxy(input->asTextureProxyRef(context));
- SkASSERT(inputProxy);
- const auto isProtected = inputProxy->isProtected();
- offset->fX = dstBounds.left();
- offset->fY = dstBounds.top();
- dstBounds.offset(-inputOffset);
- srcBounds.offset(-inputOffset);
- // Map srcBounds from input's logical image domain to that of the proxy
- srcBounds.offset(input->subset().x(), input->subset().y());
- auto fp = GrMatrixConvolutionEffect::Make(std::move(inputProxy),
- srcBounds,
- fKernelSize,
- fKernel,
- fGain,
- fBias,
- fKernelOffset,
- convert_tilemodes(fTileMode),
- fConvolveAlpha);
- if (!fp) {
- return nullptr;
- }
- return DrawWithFP(context, std::move(fp), dstBounds, ctx.outputProperties(),
- isProtected ? GrProtected::kYes : GrProtected::kNo);
- }
- #endif
- SkBitmap inputBM;
- if (!input->getROPixels(&inputBM)) {
- return nullptr;
- }
- if (inputBM.colorType() != kN32_SkColorType) {
- return nullptr;
- }
- if (!fConvolveAlpha && !inputBM.isOpaque()) {
- inputBM = unpremultiply_bitmap(inputBM);
- }
- if (!inputBM.getPixels()) {
- return nullptr;
- }
- const SkImageInfo info = SkImageInfo::MakeN32(dstBounds.width(), dstBounds.height(),
- inputBM.alphaType());
- SkBitmap dst;
- if (!dst.tryAllocPixels(info)) {
- return nullptr;
- }
- offset->fX = dstBounds.fLeft;
- offset->fY = dstBounds.fTop;
- dstBounds.offset(-inputOffset);
- srcBounds.offset(-inputOffset);
- SkIRect interior;
- if (kRepeat_TileMode == fTileMode) {
- // In repeat mode, the filterPixels calls will wrap around
- // so we just need to render 'dstBounds'
- interior = dstBounds;
- } else {
- interior = SkIRect::MakeXYWH(dstBounds.left() + fKernelOffset.fX,
- dstBounds.top() + fKernelOffset.fY,
- dstBounds.width() - fKernelSize.fWidth + 1,
- dstBounds.height() - fKernelSize.fHeight + 1);
- }
- SkIRect top = SkIRect::MakeLTRB(dstBounds.left(), dstBounds.top(),
- dstBounds.right(), interior.top());
- SkIRect bottom = SkIRect::MakeLTRB(dstBounds.left(), interior.bottom(),
- dstBounds.right(), dstBounds.bottom());
- SkIRect left = SkIRect::MakeLTRB(dstBounds.left(), interior.top(),
- interior.left(), interior.bottom());
- SkIRect right = SkIRect::MakeLTRB(interior.right(), interior.top(),
- dstBounds.right(), interior.bottom());
- SkIVector dstContentOffset = { offset->fX - inputOffset.fX, offset->fY - inputOffset.fY };
- this->filterBorderPixels(inputBM, &dst, dstContentOffset, top, srcBounds);
- this->filterBorderPixels(inputBM, &dst, dstContentOffset, left, srcBounds);
- this->filterInteriorPixels(inputBM, &dst, dstContentOffset, interior, srcBounds);
- this->filterBorderPixels(inputBM, &dst, dstContentOffset, right, srcBounds);
- this->filterBorderPixels(inputBM, &dst, dstContentOffset, bottom, srcBounds);
- return SkSpecialImage::MakeFromRaster(SkIRect::MakeWH(dstBounds.width(), dstBounds.height()),
- dst);
- }
- SkIRect SkMatrixConvolutionImageFilter::onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm,
- MapDirection dir,
- const SkIRect* inputRect) const {
- if (kReverse_MapDirection == dir && kRepeat_TileMode == fTileMode && inputRect) {
- SkASSERT(inputRect);
- return DetermineRepeatedSrcBound(src, fKernelOffset, fKernelSize, *inputRect);
- }
- SkIRect dst = src;
- int w = fKernelSize.width() - 1, h = fKernelSize.height() - 1;
- if (kReverse_MapDirection == dir) {
- dst.adjust(-fKernelOffset.fX, -fKernelOffset.fY,
- w - fKernelOffset.fX, h - fKernelOffset.fY);
- } else {
- dst.adjust(fKernelOffset.fX - w, fKernelOffset.fY - h, fKernelOffset.fX, fKernelOffset.fY);
- }
- return dst;
- }
- bool SkMatrixConvolutionImageFilter::affectsTransparentBlack() const {
- // It seems that the only rational way for repeat sample mode to work is if the caller
- // explicitly restricts the input in which case the input range is explicitly known and
- // specified.
- // TODO: is seems that this should be true for clamp mode too.
- // For the other modes, because the kernel is applied in device-space, we have no idea what
- // pixels it will affect in object-space.
- return kRepeat_TileMode != fTileMode;
- }
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