| /* |
| * 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/SkAlphaType.h" |
| #include "include/core/SkBitmap.h" |
| #include "include/core/SkBlendMode.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkColorType.h" |
| #include "include/core/SkFlattenable.h" |
| #include "include/core/SkImageFilter.h" |
| #include "include/core/SkImageInfo.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPoint.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkSamplingOptions.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkShader.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkTypes.h" |
| #include "include/effects/SkImageFilters.h" |
| #include "include/private/base/SkTPin.h" |
| #include "src/core/SkImageFilterTypes.h" |
| #include "src/core/SkImageFilter_Base.h" |
| #include "src/core/SkPicturePriv.h" |
| #include "src/core/SkReadBuffer.h" |
| #include "src/core/SkSpecialImage.h" |
| #include "src/core/SkSpecialSurface.h" |
| #include "src/core/SkValidationUtils.h" |
| #include "src/core/SkWriteBuffer.h" |
| #include "src/effects/imagefilters/SkCropImageFilter.h" |
| |
| #include <algorithm> |
| #include <memory> |
| #include <utility> |
| |
| #ifdef SK_ENABLE_SKSL |
| #include "include/core/SkM44.h" |
| #include "include/core/SkMatrix.h" |
| #include "include/core/SkTileMode.h" |
| #include "include/effects/SkRuntimeEffect.h" |
| #include "src/core/SkRuntimeEffectPriv.h" |
| #endif |
| |
| #if defined(SK_GANESH) |
| #include "src/gpu/ganesh/GrColorSpaceXform.h" |
| #include "src/gpu/ganesh/GrFragmentProcessor.h" |
| #include "src/gpu/ganesh/GrSurfaceProxy.h" |
| #include "src/gpu/ganesh/GrSurfaceProxyView.h" |
| #include "src/gpu/ganesh/effects/GrSkSLFP.h" |
| #include "src/gpu/ganesh/effects/GrTextureEffect.h" |
| #endif |
| |
| namespace { |
| |
| // DEPRECATED: This implementation does not perform any bounds calculations, or respect the CTM, |
| // and only stores part of the state needed to correctly produce the magnifying lens effect. The |
| // rest of the state is calculated in Chromium and it relies on the fact that this implementation |
| // breaks the rules for everything to work out in the compositor. |
| // TODO: Delete this once Chromium has been updated to use the new magnifier factory and impl. |
| class SkLegacyMagnifierImageFilter final : public SkImageFilter_Base { |
| public: |
| SkLegacyMagnifierImageFilter(const SkRect& srcRect, SkScalar inset, sk_sp<SkImageFilter> input, |
| const SkRect* cropRect) |
| : INHERITED(&input, 1, cropRect) |
| , fSrcRect(srcRect) |
| , fInset(inset) { |
| SkASSERT(srcRect.left() >= 0 && srcRect.top() >= 0 && inset >= 0); |
| } |
| |
| protected: |
| void flatten(SkWriteBuffer&) const override; |
| |
| sk_sp<SkSpecialImage> onFilterImage(const Context&, SkIPoint* offset) const override; |
| |
| private: |
| friend class SkMagnifierImageFilter; // For CreateProc on out-of-date SKPs |
| friend void ::SkRegisterMagnifierImageFilterFlattenable(); |
| SK_FLATTENABLE_HOOKS(SkLegacyMagnifierImageFilter) |
| |
| SkRect fSrcRect; |
| SkScalar fInset; |
| |
| using INHERITED = SkImageFilter_Base; |
| }; |
| |
| class SkMagnifierImageFilter final : public SkImageFilter_Base { |
| public: |
| SkMagnifierImageFilter(const SkRect& lensBounds, |
| float zoomAmount, |
| float inset, |
| const SkSamplingOptions& sampling, |
| sk_sp<SkImageFilter> input) |
| : SkImageFilter_Base(&input, 1, nullptr) |
| , fLensBounds(lensBounds) |
| , fZoomAmount(zoomAmount) |
| , fInset(inset) |
| , fSampling(sampling) {} |
| |
| SkRect computeFastBounds(const SkRect&) const override; |
| |
| protected: |
| void flatten(SkWriteBuffer&) const override; |
| |
| private: |
| friend void ::SkRegisterMagnifierImageFilterFlattenable(); |
| SK_FLATTENABLE_HOOKS(SkMagnifierImageFilter) |
| |
| skif::FilterResult onFilterImage(const skif::Context& context) const override; |
| |
| skif::LayerSpace<SkIRect> onGetInputLayerBounds( |
| const skif::Mapping& mapping, |
| const skif::LayerSpace<SkIRect>& desiredOutput, |
| const skif::LayerSpace<SkIRect>& contentBounds) const override; |
| |
| skif::LayerSpace<SkIRect> onGetOutputLayerBounds( |
| const skif::Mapping& mapping, |
| const skif::LayerSpace<SkIRect>& contentBounds) const override; |
| |
| skif::ParameterSpace<SkRect> fLensBounds; |
| // Zoom is relative so does not belong to a coordinate space, see note in onFilterImage(). |
| float fZoomAmount; |
| // Inset is really a ParameterSpace<SkSize> where width = height = fInset, but we store just the |
| // float here for easier serialization and convert to a size in onFilterImage(). |
| float fInset; |
| SkSamplingOptions fSampling; |
| }; |
| |
| } // end namespace |
| |
| sk_sp<SkImageFilter> SkImageFilters::Magnifier( |
| const SkRect& srcRect, SkScalar inset, sk_sp<SkImageFilter> input, |
| const CropRect& cropRect) { |
| if (!SkScalarIsFinite(inset) || !SkIsValidRect(srcRect)) { |
| return nullptr; |
| } |
| if (inset < 0) { |
| return nullptr; |
| } |
| // Negative numbers in src rect are not supported |
| if (srcRect.fLeft < 0 || srcRect.fTop < 0) { |
| return nullptr; |
| } |
| return sk_sp<SkImageFilter>(new SkLegacyMagnifierImageFilter(srcRect, inset, std::move(input), |
| cropRect)); |
| } |
| |
| sk_sp<SkImageFilter> SkImageFilters::Magnifier(const SkRect& lensBounds, |
| SkScalar zoomAmount, |
| SkScalar inset, |
| const SkSamplingOptions& sampling, |
| sk_sp<SkImageFilter> input, |
| const CropRect& cropRect) { |
| if (lensBounds.isEmpty() || !lensBounds.isFinite() || |
| zoomAmount <= 0.f || !SkScalarIsFinite(zoomAmount) || |
| inset < 0.f || !SkScalarIsFinite(inset)) { |
| return nullptr; // invalid |
| } |
| // The magnifier automatically restricts its output based on the size of the image it receives |
| // as input, so 'cropRect' only applies to its input. |
| if (cropRect) { |
| input = SkMakeCropImageFilter(*cropRect, std::move(input)); |
| } |
| |
| if (zoomAmount > 1.f) { |
| return sk_sp<SkImageFilter>(new SkMagnifierImageFilter(lensBounds, zoomAmount, inset, |
| sampling, std::move(input))); |
| } else { |
| // Zooming with a value less than 1 is technically a downscaling, which "works" but the |
| // non-linear distortion behaves unintuitively. At zoomAmount = 1, this filter is an |
| // expensive identity function so treat zoomAmount <= 1 as a no-op. |
| return input; |
| } |
| } |
| |
| void SkRegisterMagnifierImageFilterFlattenable() { |
| SK_REGISTER_FLATTENABLE(SkMagnifierImageFilter); |
| SK_REGISTER_FLATTENABLE(SkLegacyMagnifierImageFilter); |
| // TODO (michaelludwig) - Remove after grace period for SKPs to stop using old name |
| SkFlattenable::Register("SkMagnifierImageFilterImpl", SkLegacyMagnifierImageFilter::CreateProc); |
| } |
| |
| sk_sp<SkFlattenable> SkLegacyMagnifierImageFilter::CreateProc(SkReadBuffer& buffer) { |
| SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1); |
| SkRect src; |
| buffer.readRect(&src); |
| return SkImageFilters::Magnifier(src, buffer.readScalar(), common.getInput(0), |
| common.cropRect()); |
| } |
| |
| void SkLegacyMagnifierImageFilter::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writeRect(fSrcRect); |
| buffer.writeScalar(fInset); |
| } |
| |
| sk_sp<SkFlattenable> SkMagnifierImageFilter::CreateProc(SkReadBuffer& buffer) { |
| if (buffer.isVersionLT(SkPicturePriv::kRevampMagnifierFilter)) { |
| // This was actually a legacy magnifier image filter that was serialized. |
| return SkLegacyMagnifierImageFilter::CreateProc(buffer); |
| } |
| |
| SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1); |
| |
| SkRect lensBounds; |
| buffer.readRect(&lensBounds); |
| SkScalar zoomAmount = buffer.readScalar(); |
| SkScalar inset = buffer.readScalar(); |
| SkSamplingOptions sampling = buffer.readSampling(); |
| return SkImageFilters::Magnifier(lensBounds, zoomAmount, inset, sampling, common.getInput(0)); |
| } |
| |
| void SkMagnifierImageFilter::flatten(SkWriteBuffer& buffer) const { |
| this->SkImageFilter_Base::flatten(buffer); |
| buffer.writeRect(SkRect(fLensBounds)); |
| buffer.writeScalar(fZoomAmount); |
| buffer.writeScalar(fInset); |
| buffer.writeSampling(fSampling); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| #ifdef SK_ENABLE_SKSL |
| static sk_sp<SkShader> make_magnifier_shader( |
| const skif::Context& context, |
| const skif::FilterResult& input, |
| const SkSamplingOptions& sampling, |
| const skif::LayerSpace<SkRect>& lensBounds, |
| const skif::LayerSpace<SkRect>& srcRect, |
| const skif::LayerSpace<SkSize>& inset) { |
| static const SkRuntimeEffect* effect = SkMakeRuntimeEffect(SkRuntimeEffect::MakeForShader, |
| "uniform shader src;" |
| "uniform float4 lensBounds;" |
| "uniform float4 zoomXform;" |
| "uniform float2 invInset;" |
| |
| "half4 main(float2 coord) {" |
| "float2 zoomCoord = zoomXform.xy + zoomXform.zw*coord;" |
| // edgeInset is the smallest distance to the lens bounds edges, |
| // in units of "insets". |
| "float2 edgeInset = min(coord - lensBounds.xy, lensBounds.zw - coord) * invInset;" |
| |
| // The equations for 'weight' ensure that it is 0 along the outside of lensBounds so |
| // it seams with any un-zoomed, un-filtered content. The zoomed content fills a rounded |
| // rectangle that is 1 "inset" in from lensBounds with circular corners with radii |
| // equal to the inset distance. Outside of this region, there is a non-linear weighting |
| // to compress the un-zoomed content to the zoomed content. The critical zone about |
| // each corner is limited to 2x"inset" square. |
| "float weight = (edgeInset.x < 2.0 && edgeInset.y < 2.0)" |
| // Circular distortion weighted by distance to inset corner |
| "? (2.0 - length(2.0 - edgeInset))" |
| // Linear zoom, or single-axis compression outside of the inset area (if delta < 1) |
| ": min(edgeInset.x, edgeInset.y);" |
| |
| // Saturate before squaring so that negative weights are clamped to 0 before squaring |
| "weight = saturate(weight);" |
| "return src.eval(mix(coord, zoomCoord, weight*weight));" |
| "}" |
| ); |
| |
| // TODO: FilterResult or FilterBuilder should hide the details of turning a FilterResult into |
| // an SkShader (and possibly wrap binding the input for an SkRuntimeEffect, too). |
| SkIPoint inputOrigin; |
| sk_sp<SkSpecialImage> inputImage = input.imageAndOffset(context, &inputOrigin); |
| if (!inputImage) { |
| return nullptr; |
| } |
| sk_sp<SkShader> inputShader = inputImage->asShader( |
| SkTileMode::kDecal, sampling, SkMatrix::Translate(inputOrigin.fX, inputOrigin.fY)); |
| if (!inputShader) { |
| return nullptr; |
| } |
| |
| SkRuntimeShaderBuilder builder(sk_ref_sp(effect)); |
| builder.child("src") = std::move(inputShader); |
| |
| SkASSERT(inset.width() > 0.f && inset.height() > 0.f); |
| auto zoomXform = skif::LayerSpace<SkMatrix>::RectToRect(lensBounds, srcRect); |
| builder.uniform("lensBounds") = SkRect(lensBounds); |
| builder.uniform("zoomXform") = SkV4{/*Tx*/zoomXform.rc(0, 2), /*Ty*/zoomXform.rc(1, 2), |
| /*Sx*/zoomXform.rc(0, 0), /*Sy*/zoomXform.rc(1, 1)}; |
| builder.uniform("invInset") = SkV2{1.f / inset.width(), |
| 1.f / inset.height()}; |
| |
| return builder.makeShader(); |
| } |
| #endif // SK_ENABLE_SKSL |
| |
| #if defined(SK_GANESH) |
| static std::unique_ptr<GrFragmentProcessor> make_magnifier_fp( |
| std::unique_ptr<GrFragmentProcessor> input, |
| SkIRect bounds, |
| SkRect srcRect, |
| float xInvZoom, |
| float yInvZoom, |
| float xInvInset, |
| float yInvInset) { |
| static const SkRuntimeEffect* effect = SkMakeRuntimeEffect(SkRuntimeEffect::MakeForShader, |
| "uniform shader src;" |
| "uniform float4 boundsUniform;" |
| "uniform float xInvZoom;" |
| "uniform float yInvZoom;" |
| "uniform float xInvInset;" |
| "uniform float yInvInset;" |
| "uniform half2 offset;" |
| |
| "half4 main(float2 coord) {" |
| "float2 zoom_coord = offset + coord * float2(xInvZoom, yInvZoom);" |
| "float2 delta = (coord - boundsUniform.xy) * boundsUniform.zw;" |
| "delta = min(delta, float2(1.0) - delta);" |
| "delta *= float2(xInvInset, yInvInset);" |
| |
| "float weight = 0.0;" |
| "if (delta.s < 2.0 && delta.t < 2.0) {" |
| "delta = float2(2.0) - delta;" |
| "float dist = length(delta);" |
| "dist = max(2.0 - dist, 0.0);" |
| "weight = min(dist * dist, 1.0);" |
| "} else {" |
| "float2 delta_squared = delta * delta;" |
| "weight = min(min(delta_squared.x, delta_squared.y), 1.0);" |
| "}" |
| |
| "return src.eval(mix(coord, zoom_coord, weight));" |
| "}" |
| ); |
| SkV4 boundsUniform = {static_cast<float>(bounds.x()), |
| static_cast<float>(bounds.y()), |
| 1.f / bounds.width(), |
| 1.f / bounds.height()}; |
| |
| return GrSkSLFP::Make(effect, "magnifier_fp", /*inputFP=*/nullptr, GrSkSLFP::OptFlags::kNone, |
| "src", std::move(input), |
| "boundsUniform", boundsUniform, |
| "xInvZoom", xInvZoom, |
| "yInvZoom", yInvZoom, |
| "xInvInset", xInvInset, |
| "yInvInset", yInvInset, |
| "offset", SkV2{srcRect.x(), srcRect.y()}); |
| } |
| #endif |
| |
| sk_sp<SkSpecialImage> SkLegacyMagnifierImageFilter::onFilterImage(const Context& ctx, |
| SkIPoint* offset) const { |
| SkIPoint inputOffset = SkIPoint::Make(0, 0); |
| sk_sp<SkSpecialImage> input(this->filterInput(0, ctx, &inputOffset)); |
| if (!input) { |
| return nullptr; |
| } |
| |
| const SkIRect inputBounds = SkIRect::MakeXYWH(inputOffset.x(), inputOffset.y(), |
| input->width(), input->height()); |
| |
| SkIRect bounds; |
| if (!this->applyCropRect(ctx, inputBounds, &bounds)) { |
| return nullptr; |
| } |
| |
| SkScalar invInset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1; |
| |
| SkScalar invXZoom = fSrcRect.width() / bounds.width(); |
| SkScalar invYZoom = fSrcRect.height() / bounds.height(); |
| |
| |
| #if defined(SK_GANESH) |
| if (ctx.gpuBacked()) { |
| auto context = ctx.getContext(); |
| |
| GrSurfaceProxyView inputView = input->view(context); |
| SkASSERT(inputView.asTextureProxy()); |
| |
| const auto isProtected = inputView.proxy()->isProtected(); |
| const auto origin = inputView.origin(); |
| |
| offset->fX = bounds.left(); |
| offset->fY = bounds.top(); |
| bounds.offset(-inputOffset); |
| |
| // Map bounds and srcRect into the proxy space. Due to the zoom effect, |
| // it's not just an offset for fSrcRect. |
| bounds.offset(input->subset().x(), input->subset().y()); |
| SkRect srcRect = fSrcRect.makeOffset((1.f - invXZoom) * input->subset().x(), |
| (1.f - invYZoom) * input->subset().y()); |
| auto inputFP = GrTextureEffect::Make(std::move(inputView), kPremul_SkAlphaType); |
| |
| auto fp = make_magnifier_fp(std::move(inputFP), |
| bounds, |
| srcRect, |
| invXZoom, |
| invYZoom, |
| bounds.width() * invInset, |
| bounds.height() * invInset); |
| |
| fp = GrColorSpaceXformEffect::Make(std::move(fp), |
| input->getColorSpace(), input->alphaType(), |
| ctx.colorSpace(), kPremul_SkAlphaType); |
| if (!fp) { |
| return nullptr; |
| } |
| |
| return DrawWithFP(context, std::move(fp), bounds, ctx.colorType(), ctx.colorSpace(), |
| ctx.surfaceProps(), origin, isProtected); |
| } |
| #endif |
| |
| SkBitmap inputBM; |
| |
| if (!input->getROPixels(&inputBM)) { |
| return nullptr; |
| } |
| |
| if ((inputBM.colorType() != kN32_SkColorType) || |
| (fSrcRect.width() >= inputBM.width()) || (fSrcRect.height() >= inputBM.height())) { |
| return nullptr; |
| } |
| |
| SkASSERT(inputBM.getPixels()); |
| if (!inputBM.getPixels() || inputBM.width() <= 0 || inputBM.height() <= 0) { |
| return nullptr; |
| } |
| |
| const SkImageInfo info = SkImageInfo::MakeN32Premul(bounds.width(), bounds.height()); |
| |
| SkBitmap dst; |
| if (!dst.tryAllocPixels(info)) { |
| return nullptr; |
| } |
| |
| SkColor* dptr = dst.getAddr32(0, 0); |
| int dstWidth = dst.width(), dstHeight = dst.height(); |
| for (int y = 0; y < dstHeight; ++y) { |
| for (int x = 0; x < dstWidth; ++x) { |
| SkScalar x_dist = std::min(x, dstWidth - x - 1) * invInset; |
| SkScalar y_dist = std::min(y, dstHeight - y - 1) * invInset; |
| SkScalar weight = 0; |
| |
| static const SkScalar kScalar2 = SkScalar(2); |
| |
| // To create a smooth curve at the corners, we need to work on |
| // a square twice the size of the inset. |
| if (x_dist < kScalar2 && y_dist < kScalar2) { |
| x_dist = kScalar2 - x_dist; |
| y_dist = kScalar2 - y_dist; |
| |
| SkScalar dist = SkScalarSqrt(SkScalarSquare(x_dist) + |
| SkScalarSquare(y_dist)); |
| dist = std::max(kScalar2 - dist, 0.0f); |
| // SkTPin rather than std::max to handle potential NaN |
| weight = SkTPin(SkScalarSquare(dist), 0.0f, SK_Scalar1); |
| } else { |
| SkScalar sqDist = std::min(SkScalarSquare(x_dist), |
| SkScalarSquare(y_dist)); |
| // SkTPin rather than std::max to handle potential NaN |
| weight = SkTPin(sqDist, 0.0f, SK_Scalar1); |
| } |
| |
| SkScalar x_interp = weight * (fSrcRect.x() + x * invXZoom) + (1 - weight) * x; |
| SkScalar y_interp = weight * (fSrcRect.y() + y * invYZoom) + (1 - weight) * y; |
| |
| int x_val = SkTPin(bounds.x() + SkScalarFloorToInt(x_interp), 0, inputBM.width() - 1); |
| int y_val = SkTPin(bounds.y() + SkScalarFloorToInt(y_interp), 0, inputBM.height() - 1); |
| |
| *dptr = *inputBM.getAddr32(x_val, y_val); |
| dptr++; |
| } |
| } |
| |
| offset->fX = bounds.left(); |
| offset->fY = bounds.top(); |
| return SkSpecialImage::MakeFromRaster(SkIRect::MakeWH(bounds.width(), bounds.height()), |
| dst, ctx.surfaceProps()); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| skif::FilterResult SkMagnifierImageFilter::onFilterImage(const skif::Context& context) const { |
| skif::LayerSpace<SkRect> lensBounds = context.mapping().paramToLayer(fLensBounds); |
| skif::LayerSpace<SkPoint> zoomCenter = lensBounds.center(); |
| |
| skif::FilterResult childOutput = |
| this->getChildOutput(0, context.withNewDesiredOutput(lensBounds.roundOut())); |
| // If lensBounds is not partially off screen, 'childOutput' should exactly match the layer-space |
| // lens bounds. However, when this is used as a backdrop filter, or if there was a crop on the |
| // input, this may not be the case. Stylistically, this filter adjusts the lens bounds and |
| // zoomed-in content such that the non-linear inset does not extend beyond what was provided. |
| // This avoids zooming in on a clamped texture boundary. |
| if (!lensBounds.intersect(skif::LayerSpace<SkRect>(childOutput.layerBounds()))) { |
| return {}; |
| } |
| // Clamp the zoom center to be within the childOutput image |
| zoomCenter = lensBounds.clamp(zoomCenter); |
| |
| // The zoom we want to apply in layer-space is equal to |
| // mapping.paramToLayer(SkMatrix::Scale(fZoomAmount)).decomposeScale(&layerZoom). |
| // Because this filter only supports scale+translate matrices, the paramToLayer transform of |
| // the parameter-space scale matrix is a no-op. Thus layerZoom == fZoomAmount and we can avoid |
| // all of that math. This assumption is invalid if the matrix complexity is more than S+T. |
| SkASSERT(this->getCTMCapability() == MatrixCapability::kScaleTranslate); |
| float invZoom = 1.f / fZoomAmount; |
| |
| // The srcRect is the bounding box of the pixels that are linearly scaled up, about zoomCenter. |
| // This is not the visual bounds of this upscaled region, but the bounds of the source pixels |
| // that will fill the main magnified region (which is simply the inset of lensBounds). When |
| // lensBounds has not been cropped by the actual input image, these equations are identical to |
| // the more intuitive L/R = center.x -/+ width/(2*zoom) and T/B = center.y -/+ height/(2*zoom). |
| // However, when lensBounds is cropped this automatically shifts the source rectangle away from |
| // the original zoom center such that the upscaled area is contained within the input image. |
| skif::LayerSpace<SkRect> srcRect{{ |
| lensBounds.left() * invZoom + zoomCenter.x()*(1.f - invZoom), |
| lensBounds.top() * invZoom + zoomCenter.y()*(1.f - invZoom), |
| lensBounds.right() * invZoom + zoomCenter.x()*(1.f - invZoom), |
| lensBounds.bottom()* invZoom + zoomCenter.y()*(1.f - invZoom)}}; |
| |
| // When there is no SkSL support, or there's a 0 inset, the magnifier is equivalent to a |
| // rect->rect transform and crop. |
| #ifdef SK_ENABLE_SKSL |
| skif::LayerSpace<SkSize> inset = context.mapping().paramToLayer( |
| skif::ParameterSpace<SkSize>({fInset, fInset})); |
| if (inset.width() <= 0.f || inset.height() <= 0.f) |
| #endif |
| { |
| // NOTE: We crop back down to srcRect because we requested an unclipped lensBounds from the |
| // child filter. Since srcRect is dependent on the clipped lensBounds from what the child |
| // actually produced, we can't just request an unclipped srcRect initially. |
| auto zoomXform = skif::LayerSpace<SkMatrix>::RectToRect(srcRect, lensBounds); |
| return childOutput.applyCrop(context, srcRect.roundOut()) |
| .applyTransform(context, zoomXform, fSampling); |
| } |
| |
| #ifdef SK_ENABLE_SKSL |
| // TODO: FilterResult will eventually have a builder API to hide a lot of this boilerplate, |
| // since it will likely be the same for many other image filter implementations. The magnifier |
| // filter is just the first port to FilterResult that doesn't rely on applying meta transforms. |
| skif::LayerSpace<SkIRect> outputBounds = lensBounds.roundOut(); |
| sk_sp<SkSpecialSurface> surf = context.makeSurface(SkISize(outputBounds.size())); |
| if (!surf) { |
| return {}; |
| } |
| |
| SkCanvas* canvas = surf->getCanvas(); |
| canvas->translate(-outputBounds.left(), -outputBounds.top()); |
| SkPaint paint; |
| paint.setBlendMode(SkBlendMode::kSrc); |
| paint.setShader(make_magnifier_shader(context, childOutput, fSampling, |
| lensBounds, srcRect, inset)); |
| |
| canvas->drawPaint(paint); |
| |
| return {surf->makeImageSnapshot(), outputBounds.topLeft()}; |
| #endif |
| } |
| |
| skif::LayerSpace<SkIRect> SkMagnifierImageFilter::onGetInputLayerBounds( |
| const skif::Mapping& mapping, |
| const skif::LayerSpace<SkIRect>& desiredOutput, |
| const skif::LayerSpace<SkIRect>& contentBounds) const { |
| // The required input is always the lens bounds. The filter distorts the pixels contained within |
| // these bounds to zoom in on a portion of it, depending on the inset and zoom amount. However, |
| // it adjusts the region based on cropping that occurs between what's requested and what's |
| // provided. Theoretically it's possible that we could restrict the required input by the |
| // desired output, but that cropping should not adjust the zoom region or inset. This is non |
| // trivial to separate and is an unlikely use case so for now just require fLensBounds. |
| skif::LayerSpace<SkIRect> requiredInput = mapping.paramToLayer(fLensBounds).roundOut(); |
| // Our required input is the desired output for our child image filter. |
| return this->getChildInputLayerBounds(0, mapping, requiredInput, contentBounds); |
| } |
| |
| skif::LayerSpace<SkIRect> SkMagnifierImageFilter::onGetOutputLayerBounds( |
| const skif::Mapping& mapping, |
| const skif::LayerSpace<SkIRect>& contentBounds) const { |
| // The output of this filter is fLensBounds intersected with its child's output. |
| skif::LayerSpace<SkIRect> output = this->getChildOutputLayerBounds(0, mapping, contentBounds); |
| if (output.intersect(mapping.paramToLayer(fLensBounds).roundOut())) { |
| return output; |
| } else { |
| // Nothing to magnify |
| return skif::LayerSpace<SkIRect>::Empty(); |
| } |
| } |
| |
| SkRect SkMagnifierImageFilter::computeFastBounds(const SkRect& src) const { |
| SkRect bounds = this->getInput(0) ? this->getInput(0)->computeFastBounds(src) : src; |
| if (bounds.intersect(SkRect(fLensBounds))) { |
| return bounds; |
| } else { |
| return SkRect::MakeEmpty(); |
| } |
| } |
