/*
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* Copyright 2012 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkMagnifierImageFilter.h"
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#include "SkBitmap.h"
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#include "SkColorData.h"
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#include "SkColorSpaceXformer.h"
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#include "SkImageFilterPriv.h"
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#include "SkReadBuffer.h"
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#include "SkSpecialImage.h"
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#include "SkWriteBuffer.h"
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#include "SkValidationUtils.h"
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////////////////////////////////////////////////////////////////////////////////
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#if SK_SUPPORT_GPU
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#include "GrColorSpaceXform.h"
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#include "GrContext.h"
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#include "GrCoordTransform.h"
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#include "GrTexture.h"
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#include "effects/GrMagnifierEffect.h"
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#include "glsl/GrGLSLFragmentProcessor.h"
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#include "glsl/GrGLSLFragmentShaderBuilder.h"
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#include "glsl/GrGLSLProgramDataManager.h"
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#include "glsl/GrGLSLUniformHandler.h"
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#endif
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sk_sp<SkImageFilter> SkMagnifierImageFilter::Make(const SkRect& srcRect, SkScalar inset,
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sk_sp<SkImageFilter> input,
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const CropRect* cropRect) {
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if (!SkScalarIsFinite(inset) || !SkIsValidRect(srcRect)) {
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return nullptr;
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}
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if (inset < 0) {
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return nullptr;
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}
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// Negative numbers in src rect are not supported
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if (srcRect.fLeft < 0 || srcRect.fTop < 0) {
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return nullptr;
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}
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return sk_sp<SkImageFilter>(new SkMagnifierImageFilter(srcRect, inset,
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std::move(input),
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cropRect));
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}
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////////////////////////////////////////////////////////////////////////////////
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SkMagnifierImageFilter::SkMagnifierImageFilter(const SkRect& srcRect,
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SkScalar inset,
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sk_sp<SkImageFilter> input,
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const CropRect* cropRect)
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: INHERITED(&input, 1, cropRect)
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, fSrcRect(srcRect)
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, fInset(inset) {
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SkASSERT(srcRect.left() >= 0 && srcRect.top() >= 0 && inset >= 0);
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}
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sk_sp<SkFlattenable> SkMagnifierImageFilter::CreateProc(SkReadBuffer& buffer) {
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SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
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SkRect src;
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buffer.readRect(&src);
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return Make(src, buffer.readScalar(), common.getInput(0), &common.cropRect());
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}
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void SkMagnifierImageFilter::flatten(SkWriteBuffer& buffer) const {
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this->INHERITED::flatten(buffer);
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buffer.writeRect(fSrcRect);
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buffer.writeScalar(fInset);
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}
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sk_sp<SkSpecialImage> SkMagnifierImageFilter::onFilterImage(SkSpecialImage* source,
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const Context& ctx,
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SkIPoint* offset) const {
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SkIPoint inputOffset = SkIPoint::Make(0, 0);
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sk_sp<SkSpecialImage> input(this->filterInput(0, source, ctx, &inputOffset));
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if (!input) {
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return nullptr;
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}
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const SkIRect inputBounds = SkIRect::MakeXYWH(inputOffset.x(), inputOffset.y(),
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input->width(), input->height());
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SkIRect bounds;
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if (!this->applyCropRect(ctx, inputBounds, &bounds)) {
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return nullptr;
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}
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SkScalar invInset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1;
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SkScalar invXZoom = fSrcRect.width() / bounds.width();
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SkScalar invYZoom = fSrcRect.height() / bounds.height();
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#if SK_SUPPORT_GPU
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if (source->isTextureBacked()) {
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GrContext* context = source->getContext();
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sk_sp<GrTextureProxy> inputProxy(input->asTextureProxyRef(context));
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SkASSERT(inputProxy);
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offset->fX = bounds.left();
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offset->fY = bounds.top();
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bounds.offset(-inputOffset);
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auto fp = GrMagnifierEffect::Make(std::move(inputProxy),
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bounds,
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fSrcRect,
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invXZoom,
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invYZoom,
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bounds.width() * invInset,
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bounds.height() * invInset);
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fp = GrColorSpaceXformEffect::Make(std::move(fp), input->getColorSpace(),
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input->alphaType(), ctx.outputProperties().colorSpace());
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if (!fp) {
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return nullptr;
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}
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return DrawWithFP(context, std::move(fp), bounds, ctx.outputProperties());
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}
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#endif
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SkBitmap inputBM;
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if (!input->getROPixels(&inputBM)) {
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return nullptr;
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}
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if ((inputBM.colorType() != kN32_SkColorType) ||
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(fSrcRect.width() >= inputBM.width()) || (fSrcRect.height() >= inputBM.height())) {
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return nullptr;
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}
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SkASSERT(inputBM.getPixels());
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if (!inputBM.getPixels() || inputBM.width() <= 0 || inputBM.height() <= 0) {
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return nullptr;
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}
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const SkImageInfo info = SkImageInfo::MakeN32Premul(bounds.width(), bounds.height());
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SkBitmap dst;
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if (!dst.tryAllocPixels(info)) {
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return nullptr;
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}
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SkColor* dptr = dst.getAddr32(0, 0);
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int dstWidth = dst.width(), dstHeight = dst.height();
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for (int y = 0; y < dstHeight; ++y) {
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for (int x = 0; x < dstWidth; ++x) {
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SkScalar x_dist = SkMin32(x, dstWidth - x - 1) * invInset;
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SkScalar y_dist = SkMin32(y, dstHeight - y - 1) * invInset;
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SkScalar weight = 0;
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static const SkScalar kScalar2 = SkScalar(2);
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// To create a smooth curve at the corners, we need to work on
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// a square twice the size of the inset.
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if (x_dist < kScalar2 && y_dist < kScalar2) {
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x_dist = kScalar2 - x_dist;
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y_dist = kScalar2 - y_dist;
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SkScalar dist = SkScalarSqrt(SkScalarSquare(x_dist) +
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SkScalarSquare(y_dist));
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dist = SkMaxScalar(kScalar2 - dist, 0);
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weight = SkMinScalar(SkScalarSquare(dist), SK_Scalar1);
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} else {
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SkScalar sqDist = SkMinScalar(SkScalarSquare(x_dist),
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SkScalarSquare(y_dist));
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weight = SkMinScalar(sqDist, SK_Scalar1);
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}
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SkScalar x_interp = weight * (fSrcRect.x() + x * invXZoom) + (1 - weight) * x;
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SkScalar y_interp = weight * (fSrcRect.y() + y * invYZoom) + (1 - weight) * y;
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int x_val = SkTPin(bounds.x() + SkScalarFloorToInt(x_interp), 0, inputBM.width() - 1);
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int y_val = SkTPin(bounds.y() + SkScalarFloorToInt(y_interp), 0, inputBM.height() - 1);
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*dptr = *inputBM.getAddr32(x_val, y_val);
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dptr++;
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}
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}
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offset->fX = bounds.left();
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offset->fY = bounds.top();
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return SkSpecialImage::MakeFromRaster(SkIRect::MakeWH(bounds.width(), bounds.height()),
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dst);
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}
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sk_sp<SkImageFilter> SkMagnifierImageFilter::onMakeColorSpace(SkColorSpaceXformer* xformer) const {
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SkASSERT(1 == this->countInputs());
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auto input = xformer->apply(this->getInput(0));
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if (input.get() != this->getInput(0)) {
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return SkMagnifierImageFilter::Make(fSrcRect, fInset, std::move(input),
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this->getCropRectIfSet());
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}
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return this->refMe();
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}
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