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/*
* Copyright 2015 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/SkBitmap.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkImage.h"
#include "include/core/SkImageFilter.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkSurface.h"
#include "include/core/SkTileMode.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkGradientShader.h"
#include "include/effects/SkImageFilters.h"
#include "tools/Resources.h"
#include "tools/ToolUtils.h"
#include "tools/timer/TimeUtils.h"
#include <utility>
namespace skiagm {
// This GM draws image filters with a CTM containing shearing / rotation.
// It checks that the scale portion of the CTM is correctly extracted
// and applied to the image inputs separately from the non-scale portion.
static sk_sp<SkImage> make_gradient_circle(int width, int height) {
SkScalar x = SkIntToScalar(width / 2);
SkScalar y = SkIntToScalar(height / 2);
SkScalar radius = std::min(x, y) * 0.8f;
auto surface(SkSurface::MakeRasterN32Premul(width, height));
SkCanvas* canvas = surface->getCanvas();
canvas->clear(0x00000000);
SkColor colors[2];
colors[0] = SK_ColorWHITE;
colors[1] = SK_ColorBLACK;
SkPaint paint;
paint.setShader(SkGradientShader::MakeRadial(SkPoint::Make(x, y), radius, colors, nullptr, 2,
SkTileMode::kClamp));
canvas->drawCircle(x, y, radius, paint);
return surface->makeImageSnapshot();
}
class ImageFiltersTransformedGM : public GM {
public:
ImageFiltersTransformedGM() {
this->setBGColor(SK_ColorBLACK);
}
protected:
SkString onShortName() override { return SkString("imagefilterstransformed"); }
SkISize onISize() override { return SkISize::Make(420, 240); }
void onOnceBeforeDraw() override {
fCheckerboard =
ToolUtils::create_checkerboard_image(64, 64, 0xFFA0A0A0, 0xFF404040, 8);
fGradientCircle = make_gradient_circle(64, 64);
}
void onDraw(SkCanvas* canvas) override {
sk_sp<SkImageFilter> gradient(SkImageFilters::Image(fGradientCircle));
sk_sp<SkImageFilter> checkerboard(SkImageFilters::Image(fCheckerboard));
sk_sp<SkImageFilter> filters[] = {
SkImageFilters::Blur(12, 0, nullptr),
SkImageFilters::DropShadow(0, 15, 8, 0, SK_ColorGREEN, nullptr),
SkImageFilters::DisplacementMap(SkColorChannel::kR, SkColorChannel::kR, 12,
std::move(gradient), checkerboard),
SkImageFilters::Dilate(2, 2, checkerboard),
SkImageFilters::Erode(2, 2, checkerboard),
};
const SkScalar margin = SkIntToScalar(20);
const SkScalar size = SkIntToScalar(60);
for (size_t j = 0; j < 3; j++) {
canvas->save();
canvas->translate(margin, 0);
for (size_t i = 0; i < std::size(filters); ++i) {
SkPaint paint;
paint.setColor(SK_ColorWHITE);
paint.setImageFilter(filters[i]);
paint.setAntiAlias(true);
canvas->save();
canvas->translate(size * SK_ScalarHalf, size * SK_ScalarHalf);
canvas->scale(SkDoubleToScalar(0.8), SkDoubleToScalar(0.8));
if (j == 1) {
canvas->rotate(SkIntToScalar(45));
} else if (j == 2) {
canvas->skew(SkDoubleToScalar(0.5), SkDoubleToScalar(0.2));
}
canvas->translate(-size * SK_ScalarHalf, -size * SK_ScalarHalf);
canvas->drawOval(SkRect::MakeXYWH(0, size * SkDoubleToScalar(0.1),
size, size * SkDoubleToScalar(0.6)), paint);
canvas->restore();
canvas->translate(size + margin, 0);
}
canvas->restore();
canvas->translate(0, size + margin);
}
}
private:
sk_sp<SkImage> fCheckerboard;
sk_sp<SkImage> fGradientCircle;
using INHERITED = GM;
};
DEF_GM( return new ImageFiltersTransformedGM; )
} // namespace skiagm
//////////////////////////////////////////////////////////////////////////////
DEF_SIMPLE_GM(rotate_imagefilter, canvas, 500, 500) {
SkPaint paint;
const SkRect r = SkRect::MakeXYWH(50, 50, 100, 100);
sk_sp<SkImageFilter> filters[] = {
nullptr,
SkImageFilters::Blur(6, 0, nullptr),
SkImageFilters::Blend(SkBlendMode::kSrcOver, nullptr),
};
for (auto& filter : filters) {
paint.setAntiAlias(false);
paint.setImageFilter(filter);
canvas->save();
canvas->drawRect(r, paint);
canvas->translate(150, 0);
canvas->save();
canvas->rotate(30, 100, 100);
canvas->drawRect(r, paint);
canvas->restore();
paint.setAntiAlias(true);
canvas->translate(150, 0);
canvas->save();
canvas->rotate(30, 100, 100);
canvas->drawRect(r, paint);
canvas->restore();
canvas->restore();
canvas->translate(0, 150);
}
}
class ImageFilterMatrixWLocalMatrix : public skiagm::GM {
public:
// Start at 132 degrees, since that resulted in a skipped draw before the fix to
// SkLocalMatrixImageFilter's computeFastBounds() function.
ImageFilterMatrixWLocalMatrix() : fDegrees(132.f) {}
protected:
SkString onShortName() override {
return SkString("imagefilter_matrix_localmatrix");
}
SkISize onISize() override {
return SkISize::Make(512, 512);
}
bool onAnimate(double nanos) override {
// Animate the rotation angle to ensure the local matrix bounds modifications work
// for a variety of transformations.
fDegrees = TimeUtils::Scaled(1e-9f * nanos, 360.f);
return true;
}
void onOnceBeforeDraw() override {
fImage = GetResourceAsImage("images/mandrill_256.png");
}
void onDraw(SkCanvas* canvas) override {
SkMatrix localMatrix;
localMatrix.preTranslate(128, 128);
localMatrix.preScale(2.0f, 2.0f);
// This matrix applies a rotate around the center of the image (prior to the simulated
// hi-dpi 2x device scale).
SkMatrix filterMatrix;
filterMatrix.setRotate(fDegrees, 64, 64);
sk_sp<SkImageFilter> filter =
SkImageFilters::MatrixTransform(filterMatrix,
SkSamplingOptions(SkFilterMode::kLinear), nullptr)
->makeWithLocalMatrix(localMatrix);
SkPaint p;
p.setImageFilter(filter);
canvas->drawImage(fImage.get(), 128, 128, SkSamplingOptions(), &p);
}
private:
SkScalar fDegrees;
sk_sp<SkImage> fImage;
};
DEF_GM(return new ImageFilterMatrixWLocalMatrix();)
class ImageFilterComposedTransform : public skiagm::GM {
public:
// Start at 70 degrees since that highlighted the issue in skbug.com/10888
ImageFilterComposedTransform() : fDegrees(70.f) {}
protected:
SkString onShortName() override {
return SkString("imagefilter_composed_transform");
}
SkISize onISize() override {
return SkISize::Make(512, 512);
}
bool onAnimate(double nanos) override {
// Animate the rotation angle to test a variety of transformations
fDegrees = TimeUtils::Scaled(1e-9f * nanos, 360.f);
return true;
}
void onOnceBeforeDraw() override {
fImage = GetResourceAsImage("images/mandrill_256.png");
}
void onDraw(SkCanvas* canvas) override {
SkMatrix matrix = SkMatrix::RotateDeg(fDegrees);
// All four quadrants should render the same
this->drawFilter(canvas, 0.f, 0.f, this->makeDirectFilter(matrix));
this->drawFilter(canvas, 256.f, 0.f, this->makeEarlyComposeFilter(matrix));
this->drawFilter(canvas, 0.f, 256.f, this->makeLateComposeFilter(matrix));
this->drawFilter(canvas, 256.f, 256.f, this->makeFullComposeFilter(matrix));
}
private:
SkScalar fDegrees;
sk_sp<SkImage> fImage;
void drawFilter(SkCanvas* canvas, SkScalar tx, SkScalar ty, sk_sp<SkImageFilter> filter) const {
SkPaint p;
p.setImageFilter(std::move(filter));
canvas->save();
canvas->translate(tx, ty);
canvas->clipRect(SkRect::MakeWH(256, 256));
canvas->scale(0.5f, 0.5f);
canvas->translate(128, 128);
canvas->drawImage(fImage, 0, 0, SkSamplingOptions(), &p);
canvas->restore();
}
// offset(matrix(offset))
sk_sp<SkImageFilter> makeDirectFilter(const SkMatrix& matrix) const {
SkPoint v = {fImage->width() / 2.f, fImage->height() / 2.f};
sk_sp<SkImageFilter> filter = SkImageFilters::Offset(-v.fX, -v.fY, nullptr);
filter = SkImageFilters::MatrixTransform(matrix, SkSamplingOptions(SkFilterMode::kLinear),
std::move(filter));
filter = SkImageFilters::Offset(v.fX, v.fY, std::move(filter));
return filter;
}
// offset(compose(matrix, offset))
sk_sp<SkImageFilter> makeEarlyComposeFilter(const SkMatrix& matrix) const {
SkPoint v = {fImage->width() / 2.f, fImage->height() / 2.f};
sk_sp<SkImageFilter> offset = SkImageFilters::Offset(-v.fX, -v.fY, nullptr);
sk_sp<SkImageFilter> filter = SkImageFilters::MatrixTransform(
matrix, SkSamplingOptions(SkFilterMode::kLinear), nullptr);
filter = SkImageFilters::Compose(std::move(filter), std::move(offset));
filter = SkImageFilters::Offset(v.fX, v.fY, std::move(filter));
return filter;
}
// compose(offset, matrix(offset))
sk_sp<SkImageFilter> makeLateComposeFilter(const SkMatrix& matrix) const {
SkPoint v = {fImage->width() / 2.f, fImage->height() / 2.f};
sk_sp<SkImageFilter> filter = SkImageFilters::Offset(-v.fX, -v.fY, nullptr);
filter = SkImageFilters::MatrixTransform(matrix, SkSamplingOptions(SkFilterMode::kLinear),
std::move(filter));
sk_sp<SkImageFilter> offset = SkImageFilters::Offset(v.fX, v.fY, nullptr);
filter = SkImageFilters::Compose(std::move(offset), std::move(filter));
return filter;
}
// compose(offset, compose(matrix, offset))
sk_sp<SkImageFilter> makeFullComposeFilter(const SkMatrix& matrix) const {
SkPoint v = {fImage->width() / 2.f, fImage->height() / 2.f};
sk_sp<SkImageFilter> offset = SkImageFilters::Offset(-v.fX, -v.fY, nullptr);
sk_sp<SkImageFilter> filter = SkImageFilters::MatrixTransform(
matrix, SkSamplingOptions(SkFilterMode::kLinear), nullptr);
filter = SkImageFilters::Compose(std::move(filter), std::move(offset));
offset = SkImageFilters::Offset(v.fX, v.fY, nullptr);
filter = SkImageFilters::Compose(std::move(offset), std::move(filter));
return filter;
}
};
DEF_GM(return new ImageFilterComposedTransform();)
// Tests SkImageFilters::Image under tricky matrices (mirrors and perspective)
DEF_SIMPLE_GM(imagefilter_transformed_image, canvas, 256, 256) {
sk_sp<SkImage> image = GetResourceAsImage("images/color_wheel.png");
sk_sp<SkImageFilter> imageFilter = SkImageFilters::Image(image);
const SkRect imageRect = SkRect::MakeIWH(image->width(), image->height());
SkM44 m1 = SkM44::Translate(0.9f * image->width(), 0.1f * image->height()) *
SkM44::Scale(-.8f, .8f);
SkM44 m2 = SkM44::RectToRect({-1.f, -1.f, 1.f, 1.f}, imageRect) *
SkM44::Perspective(0.01f, 100.f, SK_ScalarPI / 3.f) *
SkM44::Translate(0.f, 0.f, -2.f) *
SkM44::Rotate({0.f, 1.f, 0.f}, SK_ScalarPI / 6.f) *
SkM44::RectToRect(imageRect, {-1.f, -1.f, 1.f, 1.f});
SkFont font(ToolUtils::create_portable_typeface());
canvas->drawString("Columns should match", 5.f, 15.f, font, SkPaint());
canvas->translate(0.f, 10.f);
SkSamplingOptions sampling(SkFilterMode::kLinear);
for (auto m : {m1, m2}) {
canvas->save();
for (bool canvasTransform : {false, true}) {
canvas->save();
canvas->clipRect(imageRect);
sk_sp<SkImageFilter> finalFilter;
if (canvasTransform) {
canvas->concat(m);
finalFilter = imageFilter;
} else {
finalFilter = SkImageFilters::MatrixTransform(m.asM33(), sampling, imageFilter);
}
SkPaint paint;
paint.setImageFilter(std::move(finalFilter));
canvas->drawPaint(paint);
canvas->restore();
canvas->translate(image->width(), 0.f);
}
canvas->restore();
canvas->translate(0.f, image->height());
}
}