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- /*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "gm/gm.h"
- #include "include/core/SkBlendMode.h"
- #include "include/core/SkCanvas.h"
- #include "include/core/SkColor.h"
- #include "include/core/SkColorFilter.h"
- #include "include/core/SkImage.h"
- #include "include/core/SkImageFilter.h"
- #include "include/core/SkImageInfo.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkPoint.h"
- #include "include/core/SkPoint3.h"
- #include "include/core/SkRect.h"
- #include "include/core/SkRefCnt.h"
- #include "include/core/SkRegion.h"
- #include "include/core/SkScalar.h"
- #include "include/core/SkSize.h"
- #include "include/core/SkString.h"
- #include "include/core/SkSurface.h"
- #include "include/core/SkTypes.h"
- #include "include/effects/SkAlphaThresholdFilter.h"
- #include "include/effects/SkArithmeticImageFilter.h"
- #include "include/effects/SkBlurImageFilter.h"
- #include "include/effects/SkColorFilterImageFilter.h"
- #include "include/effects/SkDisplacementMapEffect.h"
- #include "include/effects/SkDropShadowImageFilter.h"
- #include "include/effects/SkImageSource.h"
- #include "include/effects/SkLightingImageFilter.h"
- #include "include/effects/SkMatrixConvolutionImageFilter.h"
- #include "include/effects/SkMergeImageFilter.h"
- #include "include/effects/SkMorphologyImageFilter.h"
- #include "include/effects/SkOffsetImageFilter.h"
- #include "include/effects/SkTileImageFilter.h"
- #include "include/effects/SkXfermodeImageFilter.h"
- #include "include/gpu/GrContext.h"
- #include "tools/Resources.h"
- #include "tools/ToolUtils.h"
- #include <utility>
- ///////////////////////////////////////////////////////////////////////////////
- static void show_bounds(SkCanvas* canvas, const SkIRect* clip, const SkIRect* inSubset,
- const SkIRect* outSubset) {
- const SkIRect* rects[] { clip, inSubset, outSubset };
- SkColor colors[] { SK_ColorBLUE, SK_ColorYELLOW, SK_ColorRED };
- SkPaint paint;
- paint.setStyle(SkPaint::kStroke_Style);
- for (size_t i = 0; i < SK_ARRAY_COUNT(rects); ++i) {
- // Skip null bounds rects, since not all methods have subsets
- if (rects[i]) {
- paint.setColor(colors[i]);
- canvas->drawRect(SkRect::Make(*(rects[i])), paint);
- }
- }
- }
- // Factories for creating image filters, either with or without a cropRect
- // (this could go away if there was a SkImageFilter::makeWithCropRect() function, but that seems
- // less generally useful).
- typedef sk_sp<SkImageFilter> (*FilterFactory)(sk_sp<SkImage> auxImage, const SkIRect* cropRect);
- SkImageFilter::CropRect make_crop(const SkIRect* cropRect) {
- if (cropRect) {
- return SkImageFilter::CropRect(SkRect::Make(*cropRect));
- } else {
- return SkImageFilter::CropRect(SkRect(), 0x0 /* no edge flags */);
- }
- }
- static sk_sp<SkImageFilter> color_filter_factory(sk_sp<SkImage> auxImage, const SkIRect* cropRect) {
- // The color filter uses kSrcIn so that it respects the transparency introduced by clamping;
- // using kSrc would just turn the entire out rect to green regardless.
- auto cf = SkColorFilters::Blend(SK_ColorGREEN, SkBlendMode::kSrcIn);
- auto crop = make_crop(cropRect);
- return SkColorFilterImageFilter::Make(std::move(cf), nullptr, &crop);
- }
- static sk_sp<SkImageFilter> blur_filter_factory(sk_sp<SkImage> auxImage, const SkIRect* cropRect) {
- auto crop = make_crop(cropRect);
- return SkBlurImageFilter::Make(2.0f, 2.0f, nullptr, &crop);
- }
- static sk_sp<SkImageFilter> drop_shadow_factory(sk_sp<SkImage> auxImage, const SkIRect* cropRect) {
- auto crop = make_crop(cropRect);
- return SkDropShadowImageFilter::Make(
- 10.0f, 5.0f, 3.0f, 3.0f, SK_ColorBLUE,
- SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
- nullptr, &crop);
- }
- static sk_sp<SkImageFilter> offset_factory(sk_sp<SkImage> auxImage, const SkIRect* cropRect) {
- auto crop = make_crop(cropRect);
- return SkOffsetImageFilter::Make(10.f, 5.f, nullptr, &crop);
- }
- static sk_sp<SkImageFilter> dilate_factory(sk_sp<SkImage> auxImage, const SkIRect* cropRect) {
- auto crop = make_crop(cropRect);
- return SkDilateImageFilter::Make(10.f, 5.f, nullptr, &crop);
- }
- static sk_sp<SkImageFilter> erode_factory(sk_sp<SkImage> auxImage, const SkIRect* cropRect) {
- auto crop = make_crop(cropRect);
- return SkErodeImageFilter::Make(10.f, 5.f, nullptr, &crop);
- }
- static sk_sp<SkImageFilter> displacement_factory(sk_sp<SkImage> auxImage, const SkIRect* cropRect) {
- auto crop = make_crop(cropRect);
- sk_sp<SkImageFilter> displacement = SkImageSource::Make(std::move(auxImage));
- return SkDisplacementMapEffect::Make(
- SkDisplacementMapEffect::kR_ChannelSelectorType,
- SkDisplacementMapEffect::kG_ChannelSelectorType,
- 40.f, std::move(displacement), nullptr, &crop);
- }
- static sk_sp<SkImageFilter> arithmetic_factory(sk_sp<SkImage> auxImage, const SkIRect* cropRect) {
- auto crop = make_crop(cropRect);
- sk_sp<SkImageFilter> background = SkImageSource::Make(std::move(auxImage));
- return SkArithmeticImageFilter::Make(0.0f, .6f, 1.f, 0.f, false, std::move(background),
- nullptr, &crop);
- }
- static sk_sp<SkImageFilter> xfermode_factory(sk_sp<SkImage> auxImage, const SkIRect* cropRect) {
- auto crop = make_crop(cropRect);
- sk_sp<SkImageFilter> background = SkImageSource::Make(std::move(auxImage));
- return SkXfermodeImageFilter::Make(
- SkBlendMode::kModulate, std::move(background), nullptr, &crop);
- }
- static sk_sp<SkImageFilter> convolution_factory(sk_sp<SkImage> auxImage, const SkIRect* cropRect) {
- auto crop = make_crop(cropRect);
- SkISize kernelSize = SkISize::Make(3, 3);
- SkIPoint kernelOffset = SkIPoint::Make(1, 1);
- // A Laplacian edge detector, ee https://en.wikipedia.org/wiki/Kernel_(image_processing)
- SkScalar kernel[9] = {-1.f, -1.f, -1.f,
- -1.f, 8.f, -1.f,
- -1.f, -1.f, -1.f};
- return SkMatrixConvolutionImageFilter::Make(
- kernelSize, kernel, 1.f, 0.f, kernelOffset,
- SkMatrixConvolutionImageFilter::kClamp_TileMode, false, nullptr, &crop);
- }
- static sk_sp<SkImageFilter> matrix_factory(sk_sp<SkImage> auxImage, const SkIRect* cropRect) {
- SkMatrix matrix = SkMatrix::I();
- matrix.setRotate(45.f, 50.f, 50.f);
- // This doesn't support a cropRect
- return SkImageFilter::MakeMatrixFilter(matrix, kLow_SkFilterQuality, nullptr);
- }
- static sk_sp<SkImageFilter> alpha_threshold_factory(sk_sp<SkImage> auxImage,
- const SkIRect* cropRect) {
- auto crop = make_crop(cropRect);
- // Centered cross with higher opacity
- SkRegion region(SkIRect::MakeLTRB(30, 45, 70, 55));
- region.op(SkIRect::MakeLTRB(45, 30, 55, 70), SkRegion::kUnion_Op);
- return SkAlphaThresholdFilter::Make(region, 1.f, .2f, nullptr, &crop);
- }
- static sk_sp<SkImageFilter> lighting_factory(sk_sp<SkImage> auxImage, const SkIRect* cropRect) {
- auto crop = make_crop(cropRect);
- // Must convert the RGB values of the source to alpha, since that is what the lighting filters
- // use to estimate their normals. This color matrix changes the color to white and the alpha
- // to be equal to the approx. luminance of the original color.
- static const float kMatrix[20] = {
- 0.f, 0.f, 0.f, 0.f, 1.f,
- 0.f, 0.f, 0.f, 0.f, 1.f,
- 0.f, 0.f, 0.f, 0.f, 1.f,
- 0.2126f, 0.7152f, 0.0722f, 0.f, 0.f
- };
- sk_sp<SkImageFilter> srcToAlpha = SkColorFilterImageFilter::Make(
- SkColorFilters::Matrix(kMatrix), nullptr);
- // Combine both specular and diffuse into a single DAG since they use separate internal filter
- // implementations.
- SkScalar sinAzimuth = SkScalarSin(SkDegreesToRadians(225.f)),
- cosAzimuth = SkScalarCos(SkDegreesToRadians(225.f));
- SkPoint3 spotTarget = SkPoint3::Make(SkIntToScalar(40), SkIntToScalar(40), 0);
- SkPoint3 diffLocation = SkPoint3::Make(spotTarget.fX + 50 * cosAzimuth,
- spotTarget.fY + 50 * sinAzimuth,
- SkIntToScalar(10));
- SkPoint3 specLocation = SkPoint3::Make(spotTarget.fX - 50 * sinAzimuth,
- spotTarget.fY + 50 * cosAzimuth,
- SkIntToScalar(10));
- sk_sp<SkImageFilter> diffuse = SkLightingImageFilter::MakePointLitDiffuse(
- diffLocation, SK_ColorWHITE, /* scale */ 1.f, /* kd */ 2.f, srcToAlpha, &crop);
- sk_sp<SkImageFilter> specular = SkLightingImageFilter::MakePointLitSpecular(
- specLocation, SK_ColorRED, /* scale */ 1.f, /* ks */ 1.f, /* shine */ 8.f,
- srcToAlpha, &crop);
- return SkMergeImageFilter::Make(std::move(diffuse), std::move(specular), &crop);
- }
- static sk_sp<SkImageFilter> tile_factory(sk_sp<SkImage> auxImage, const SkIRect* cropRect) {
- // Tile the subset over a large region
- return SkTileImageFilter::Make(SkRect::MakeLTRB(25, 25, 75, 75), SkRect::MakeWH(100, 100),
- nullptr);
- }
- namespace {
- enum class Strategy {
- // Uses makeWithFilter, passing in subset and clip directly
- kMakeWithFilter,
- // Uses saveLayer after clipRect() to filter on the restore (i.e. reference image)
- kSaveLayer
- };
- };
- // In this GM, we're going to feed the inner portion of a 100x100 mandrill (i.e., strip off a
- // 25-wide border) through the makeWithFilter method. We'll then draw the appropriate subset of the
- // result to the screen at the given offset. Some filters rely on a secondary image, which will be a
- // 100x100 checkerboard. The original image is drawn in the background so that alignment is clear
- // when drawing the result at its reported offset.
- class ImageMakeWithFilterGM : public skiagm::GM {
- public:
- ImageMakeWithFilterGM (Strategy strategy, bool filterWithCropRect = false)
- : fStrategy(strategy)
- , fFilterWithCropRect(filterWithCropRect)
- , fMainImage(nullptr)
- , fAuxImage(nullptr) {}
- protected:
- SkString onShortName() override {
- SkString name = SkString("imagemakewithfilter");
- if (fFilterWithCropRect) {
- name.append("_crop");
- }
- if (fStrategy == Strategy::kSaveLayer) {
- name.append("_ref");
- }
- return name;
- }
- SkISize onISize() override { return SkISize::Make(1980, 860); }
- void onOnceBeforeDraw() override {
- SkImageInfo info = SkImageInfo::MakeN32(100, 100, kUnpremul_SkAlphaType);
- auto surface = SkSurface::MakeRaster(info, nullptr);
- sk_sp<SkImage> colorImage = GetResourceAsImage("images/mandrill_128.png");
- // Resize to 100x100
- surface->getCanvas()->drawImageRect(
- colorImage, SkRect::MakeWH(colorImage->width(), colorImage->height()),
- SkRect::MakeWH(info.width(), info.height()), nullptr);
- fMainImage = surface->makeImageSnapshot();
- ToolUtils::draw_checkerboard(surface->getCanvas());
- fAuxImage = surface->makeImageSnapshot();
- }
- void onDraw(SkCanvas* canvas) override {
- FilterFactory filters[] = {
- color_filter_factory,
- blur_filter_factory,
- drop_shadow_factory,
- offset_factory,
- dilate_factory,
- erode_factory,
- displacement_factory,
- arithmetic_factory,
- xfermode_factory,
- convolution_factory,
- matrix_factory,
- alpha_threshold_factory,
- lighting_factory,
- tile_factory
- };
- const char* filterNames[] = {
- "Color",
- "Blur",
- "Drop Shadow",
- "Offset",
- "Dilate",
- "Erode",
- "Displacement",
- "Arithmetic",
- "Xfer Mode",
- "Convolution",
- "Matrix Xform",
- "Alpha Threshold",
- "Lighting",
- "Tile"
- };
- static_assert(SK_ARRAY_COUNT(filters) == SK_ARRAY_COUNT(filterNames), "filter name length");
- SkIRect clipBounds[] {
- { -20, -20, 100, 100 },
- { 0, 0, 75, 75 },
- { 20, 20, 100, 100 },
- { -20, -20, 50, 50 },
- { 20, 20, 50, 50 },
- { 30, 30, 75, 75 }
- };
- // These need to be GPU-backed when on the GPU to ensure that the image filters use the GPU
- // code paths (otherwise they may choose to do CPU filtering then upload)
- sk_sp<SkImage> mainImage, auxImage;
- if (canvas->getGrContext()) {
- if (canvas->getGrContext()->abandoned()) {
- return;
- }
- mainImage = fMainImage->makeTextureImage(canvas->getGrContext(), nullptr);
- auxImage = fAuxImage->makeTextureImage(canvas->getGrContext(), nullptr);
- } else {
- mainImage = fMainImage;
- auxImage = fAuxImage;
- }
- SkASSERT(mainImage && (mainImage->isTextureBacked() || !canvas->getGrContext()));
- SkASSERT(auxImage && (auxImage->isTextureBacked() || !canvas->getGrContext()));
- SkScalar MARGIN = SkIntToScalar(40);
- SkScalar DX = mainImage->width() + MARGIN;
- SkScalar DY = auxImage->height() + MARGIN;
- // Header hinting at what the filters do
- SkPaint textPaint;
- textPaint.setAntiAlias(true);
- SkFont font(nullptr, 12);
- for (size_t i = 0; i < SK_ARRAY_COUNT(filterNames); ++i) {
- canvas->drawString(filterNames[i], DX * i + MARGIN, 15, font, textPaint);
- }
- canvas->translate(MARGIN, MARGIN);
- for (auto clipBound : clipBounds) {
- canvas->save();
- for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
- SkIRect subset = SkIRect::MakeXYWH(25, 25, 50, 50);
- SkIRect outSubset;
- // Draw the original image faintly so that it aids in checking alignment of the
- // filtered result.
- SkPaint alpha;
- alpha.setAlphaf(0.3f);
- canvas->drawImage(mainImage, 0, 0, &alpha);
- this->drawImageWithFilter(canvas, mainImage, auxImage, filters[i], clipBound,
- subset, &outSubset);
- // Draw outlines to highlight what was subset, what was cropped, and what was output
- // (no output subset is displayed for kSaveLayer since that information isn't avail)
- SkIRect* outSubsetBounds = nullptr;
- if (fStrategy != Strategy::kSaveLayer) {
- outSubsetBounds = &outSubset;
- }
- show_bounds(canvas, &clipBound, &subset, outSubsetBounds);
- canvas->translate(DX, 0);
- }
- canvas->restore();
- canvas->translate(0, DY);
- }
- }
- private:
- Strategy fStrategy;
- bool fFilterWithCropRect;
- sk_sp<SkImage> fMainImage;
- sk_sp<SkImage> fAuxImage;
- void drawImageWithFilter(SkCanvas* canvas, sk_sp<SkImage> mainImage, sk_sp<SkImage> auxImage,
- FilterFactory filterFactory, const SkIRect& clip,
- const SkIRect& subset, SkIRect* dstRect) {
- // When creating the filter with a crop rect equal to the clip, we should expect to see no
- // difference from a filter without a crop rect. However, if the CTM isn't managed properly
- // by makeWithFilter, then the final result will be the incorrect intersection of the clip
- // and the transformed crop rect.
- sk_sp<SkImageFilter> filter = filterFactory(auxImage,
- fFilterWithCropRect ? &clip : nullptr);
- if (fStrategy == Strategy::kSaveLayer) {
- SkAutoCanvasRestore acr(canvas, true);
- // Clip before the saveLayer with the filter
- canvas->clipRect(SkRect::Make(clip));
- // Put the image filter on the layer
- SkPaint paint;
- paint.setImageFilter(filter);
- canvas->saveLayer(nullptr, &paint);
- // Draw the original subset of the image
- canvas->drawImageRect(mainImage, subset, SkRect::Make(subset), nullptr);
- *dstRect = subset;
- } else {
- sk_sp<SkImage> result;
- SkIRect outSubset;
- SkIPoint offset;
- result = mainImage->makeWithFilter(filter.get(), subset, clip, &outSubset, &offset);
- SkASSERT(result);
- SkASSERT(mainImage->isTextureBacked() == result->isTextureBacked());
- *dstRect = SkIRect::MakeXYWH(offset.x(), offset.y(),
- outSubset.width(), outSubset.height());
- canvas->drawImageRect(result, outSubset, SkRect::Make(*dstRect), nullptr);
- }
- }
- typedef GM INHERITED;
- };
- // The different strategies should all look the same, with the exception of filters that affect
- // transparent black (i.e. the lighting filter). In the save layer case, the filter affects the
- // transparent pixels outside of the drawn subset, whereas the makeWithFilter is restricted. This
- // works as intended.
- DEF_GM( return new ImageMakeWithFilterGM(Strategy::kMakeWithFilter); )
- DEF_GM( return new ImageMakeWithFilterGM(Strategy::kSaveLayer); )
- // Test with crop rects on the image filters; should look identical to above if working correctly
- DEF_GM( return new ImageMakeWithFilterGM(Strategy::kMakeWithFilter, true); )
- DEF_GM( return new ImageMakeWithFilterGM(Strategy::kSaveLayer, true); )
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