| /* |
| * 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(); |
| } |
| |
| #ifndef SK_IGNORE_TO_STRING |
| 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(")"); |
| } |
| #endif |