| /* |
| * 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/effects/SkImageFilters.h" |
| #include "include/private/SkColorData.h" |
| #include "include/private/SkTPin.h" |
| #include "src/core/SkImageFilter_Base.h" |
| #include "src/core/SkReadBuffer.h" |
| #include "src/core/SkSpecialImage.h" |
| #include "src/core/SkValidationUtils.h" |
| #include "src/core/SkWriteBuffer.h" |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| #if SK_SUPPORT_GPU |
| #include "src/core/SkRuntimeEffectPriv.h" |
| #include "src/gpu/GrColorSpaceXform.h" |
| #include "src/gpu/effects/GrSkSLFP.h" |
| #include "src/gpu/effects/GrTextureEffect.h" |
| #endif |
| |
| namespace { |
| |
| class SkMagnifierImageFilter final : public SkImageFilter_Base { |
| public: |
| SkMagnifierImageFilter(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 void ::SkRegisterMagnifierImageFilterFlattenable(); |
| SK_FLATTENABLE_HOOKS(SkMagnifierImageFilter) |
| |
| SkRect fSrcRect; |
| SkScalar fInset; |
| |
| using INHERITED = SkImageFilter_Base; |
| }; |
| |
| } // 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 SkMagnifierImageFilter(srcRect, inset, std::move(input), |
| cropRect)); |
| } |
| |
| void SkRegisterMagnifierImageFilterFlattenable() { |
| SK_REGISTER_FLATTENABLE(SkMagnifierImageFilter); |
| // TODO (michaelludwig) - Remove after grace period for SKPs to stop using old name |
| SkFlattenable::Register("SkMagnifierImageFilterImpl", SkMagnifierImageFilter::CreateProc); |
| } |
| |
| sk_sp<SkFlattenable> SkMagnifierImageFilter::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 SkMagnifierImageFilter::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writeRect(fSrcRect); |
| buffer.writeScalar(fInset); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| #if SK_SUPPORT_GPU |
| 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 auto effect = SkMakeRuntimeEffect(SkRuntimeEffect::MakeForShader, R"( |
| 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 sample(src, 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, |
| "src", std::move(input), |
| "boundsUniform", boundsUniform, |
| "xInvZoom", xInvZoom, |
| "yInvZoom", yInvZoom, |
| "xInvInset", xInvInset, |
| "yInvInset", yInvInset, |
| "offset", SkV2{srcRect.x(), srcRect.y()}); |
| } |
| #endif |
| |
| sk_sp<SkSpecialImage> SkMagnifierImageFilter::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 SK_SUPPORT_GPU |
| if (ctx.gpuBacked()) { |
| auto context = ctx.getContext(); |
| |
| GrSurfaceProxyView inputView = input->view(context); |
| SkASSERT(inputView.asTextureProxy()); |
| |
| const auto isProtected = inputView.proxy()->isProtected(); |
| |
| 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(), 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()); |
| } |