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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 "SkMagnifierImageFilter.h"
#include "SkBitmap.h"
#include "SkColorData.h"
#include "SkColorSpaceXformer.h"
#include "SkImageFilterPriv.h"
#include "SkReadBuffer.h"
#include "SkSpecialImage.h"
#include "SkWriteBuffer.h"
#include "SkValidationUtils.h"
////////////////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
#include "../private/GrGLSL.h"
#include "GrColorSpaceXform.h"
#include "GrContext.h"
#include "GrCoordTransform.h"
#include "GrTexture.h"
#include "effects/GrMagnifierEffect.h"
#include "glsl/GrGLSLFragmentProcessor.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
#include "glsl/GrGLSLProgramDataManager.h"
#include "glsl/GrGLSLUniformHandler.h"
#endif
sk_sp<SkImageFilter> SkMagnifierImageFilter::Make(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));
}
////////////////////////////////////////////////////////////////////////////////
SkMagnifierImageFilter::SkMagnifierImageFilter(const SkRect& srcRect,
SkScalar inset,
sk_sp<SkImageFilter> input,
const CropRect* cropRect)
: INHERITED(&input, 1, cropRect)
, fSrcRect(srcRect)
, fInset(inset) {
SkASSERT(srcRect.left() >= 0 && srcRect.top() >= 0 && inset >= 0);
}
sk_sp<SkFlattenable> SkMagnifierImageFilter::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
SkRect src;
buffer.readRect(&src);
return Make(src, buffer.readScalar(), common.getInput(0), &common.cropRect());
}
void SkMagnifierImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeRect(fSrcRect);
buffer.writeScalar(fInset);
}
sk_sp<SkSpecialImage> SkMagnifierImageFilter::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;
}
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 (source->isTextureBacked()) {
GrContext* context = source->getContext();
sk_sp<GrTextureProxy> inputProxy(input->asTextureProxyRef(context));
SkASSERT(inputProxy);
offset->fX = bounds.left();
offset->fY = bounds.top();
bounds.offset(-inputOffset);
GrPixelConfig inputConfig = inputProxy->config();
auto fp = GrMagnifierEffect::Make(std::move(inputProxy),
bounds,
fSrcRect,
invXZoom,
invYZoom,
bounds.width() * invInset,
bounds.height() * invInset);
fp = GrColorSpaceXformEffect::Make(std::move(fp), input->getColorSpace(),
inputConfig, ctx.outputProperties().colorSpace());
if (!fp) {
return nullptr;
}
return DrawWithFP(context, std::move(fp), bounds, ctx.outputProperties());
}
#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 = SkMin32(x, dstWidth - x - 1) * invInset;
SkScalar y_dist = SkMin32(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 = SkMaxScalar(kScalar2 - dist, 0);
weight = SkMinScalar(SkScalarSquare(dist), SK_Scalar1);
} else {
SkScalar sqDist = SkMinScalar(SkScalarSquare(x_dist),
SkScalarSquare(y_dist));
weight = SkMinScalar(sqDist, 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);
}
sk_sp<SkImageFilter> SkMagnifierImageFilter::onMakeColorSpace(SkColorSpaceXformer* xformer) const {
SkASSERT(1 == this->countInputs());
auto input = xformer->apply(this->getInput(0));
if (input.get() != this->getInput(0)) {
return SkMagnifierImageFilter::Make(fSrcRect, fInset, std::move(input),
this->getCropRectIfSet());
}
return this->refMe();
}
void SkMagnifierImageFilter::toString(SkString* str) const {
str->appendf("SkMagnifierImageFilter: (");
str->appendf("src: (%f,%f,%f,%f) ",
fSrcRect.fLeft, fSrcRect.fTop, fSrcRect.fRight, fSrcRect.fBottom);
str->appendf("inset: %f", fInset);
str->append(")");
}
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