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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/SkAlphaType.h"
#include "include/core/SkBitmap.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/SkM44.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkImageFilters.h"
#include "include/effects/SkRuntimeEffect.h"
#include "include/private/base/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"
#include <algorithm>
#include <memory>
#include <utility>
#if defined(SK_GANESH)
#include "src/core/SkRuntimeEffectPriv.h"
#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 {
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 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> 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 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());
}