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- /*
- * Copyright 2013 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/SkCanvas.h"
- #include "include/core/SkColor.h"
- #include "include/core/SkColorSpace.h"
- #include "include/core/SkImage.h"
- #include "include/core/SkImageFilter.h"
- #include "include/core/SkImageInfo.h"
- #include "include/core/SkMatrix.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkRect.h"
- #include "include/core/SkRefCnt.h"
- #include "include/core/SkRegion.h"
- #include "include/core/SkSize.h"
- #include "include/core/SkString.h"
- #include "include/core/SkSurface.h"
- #include "include/effects/SkAlphaThresholdFilter.h"
- #include "include/effects/SkImageSource.h"
- #include "include/effects/SkOffsetImageFilter.h"
- #include "include/utils/SkRandom.h"
- #include "tools/ToolUtils.h"
- #include <utility>
- #define WIDTH 500
- #define HEIGHT 500
- static void draw_rects(SkCanvas* canvas) {
- SkPaint rectPaint;
- rectPaint.setColor(SK_ColorBLUE);
- canvas->drawRect(SkRect::MakeXYWH(0, 0, WIDTH / 2, HEIGHT / 2), rectPaint);
- rectPaint.setColor(0xBFFF0000);
- canvas->drawRect(SkRect::MakeXYWH(WIDTH / 2, 0, WIDTH / 2, HEIGHT / 2), rectPaint);
- rectPaint.setColor(0x3F00FF00);
- canvas->drawRect(SkRect::MakeXYWH(0, HEIGHT / 2, WIDTH / 2, HEIGHT / 2), rectPaint);
- rectPaint.setColor(SK_ColorTRANSPARENT);
- canvas->drawRect(SkRect::MakeXYWH(WIDTH / 2, HEIGHT / 2, WIDTH / 2, HEIGHT / 2), rectPaint);
- }
- static SkPaint create_filter_paint(SkImageFilter::CropRect* cropRect = nullptr) {
- SkIRect rects[2];
- rects[0] = SkIRect::MakeXYWH(0, 150, WIDTH, HEIGHT - 300);
- rects[1] = SkIRect::MakeXYWH(150, 0, WIDTH - 300, HEIGHT);
- SkRegion region;
- region.setRects(rects, 2);
- SkPaint paint;
- sk_sp<SkImageFilter> offset(SkOffsetImageFilter::Make(25, 25, nullptr));
- paint.setImageFilter(SkAlphaThresholdFilter::Make(region, 0.2f, 0.7f, std::move(offset), cropRect));
- return paint;
- }
- class ImageAlphaThresholdGM : public skiagm::GM {
- public:
- ImageAlphaThresholdGM(bool useCropRect) : fUseCropRect(useCropRect) {
- this->setBGColor(SK_ColorWHITE);
- }
- protected:
- SkString onShortName() override {
- if (fUseCropRect) {
- return SkString("imagealphathreshold_crop");
- }
- return SkString("imagealphathreshold");
- }
- SkISize onISize() override {
- return SkISize::Make(WIDTH, HEIGHT);
- }
- void onDraw(SkCanvas* canvas) override {
- SkMatrix matrix;
- matrix.reset();
- matrix.setTranslate(WIDTH * .1f, HEIGHT * .1f);
- matrix.postScale(.8f, .8f);
- canvas->concat(matrix);
- SkRect r = SkRect::MakeLTRB(100, 100, WIDTH - 100, HEIGHT - 100);
- SkImageFilter::CropRect cropRect(r);
- SkPaint paint = create_filter_paint(fUseCropRect ? &cropRect : nullptr);
- canvas->saveLayer(nullptr, &paint);
- draw_rects(canvas);
- canvas->restore();
- }
- private:
- bool fUseCropRect;
- typedef GM INHERITED;
- };
- // Create a 'width' x 'height' SkSurface that matches the colorType of 'canvas' as
- // best we can
- static sk_sp<SkSurface> make_color_matching_surface(SkCanvas* canvas, int width, int height,
- SkAlphaType at) {
- SkColorType ct = canvas->imageInfo().colorType();
- sk_sp<SkColorSpace> cs(canvas->imageInfo().refColorSpace());
- if (kUnknown_SkColorType == ct) {
- // For backends that aren't yet color-space aware we just fallback to N32.
- ct = kN32_SkColorType;
- cs = nullptr;
- } else if (SkColorTypeIsAlwaysOpaque(ct)) {
- at = kOpaque_SkAlphaType;
- }
- SkImageInfo info = SkImageInfo::Make(width, height, ct, at, std::move(cs));
- return ToolUtils::makeSurface(canvas, info);
- }
- class ImageAlphaThresholdSurfaceGM : public skiagm::GM {
- public:
- ImageAlphaThresholdSurfaceGM() {
- this->setBGColor(0xFFFFFFFF);
- }
- protected:
- SkString onShortName() override {
- return SkString("imagealphathreshold_surface");
- }
- SkISize onISize() override {
- return SkISize::Make(WIDTH, HEIGHT);
- }
- DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override {
- SkMatrix matrix;
- matrix.reset();
- matrix.setTranslate(WIDTH * .1f, HEIGHT * .1f);
- matrix.postScale(.8f, .8f);
- canvas->concat(matrix);
- sk_sp<SkSurface> surface(make_color_matching_surface(canvas, WIDTH, HEIGHT,
- kPremul_SkAlphaType));
- if (!surface) {
- *errorMsg = "make_color_matching_surface failed";
- return DrawResult::kFail;
- }
- surface->getCanvas()->clear(SK_ColorTRANSPARENT);
- draw_rects(surface->getCanvas());
- SkPaint paint = create_filter_paint();
- canvas->clipRect(SkRect::MakeLTRB(100, 100, WIDTH - 100, HEIGHT - 100));
- canvas->drawImage(surface->makeImageSnapshot().get(), 0, 0, &paint);
- return DrawResult::kOk;
- }
- private:
- typedef skiagm::GM INHERITED;
- };
- //////////////////////////////////////////////////////////////////////////////
- DEF_GM(return new ImageAlphaThresholdGM(true);)
- DEF_GM(return new ImageAlphaThresholdGM(false);)
- DEF_GM(return new ImageAlphaThresholdSurfaceGM();)
- //////////////////////////////////////////////////////////////////////////////
- static sk_sp<SkImage> make_img() {
- SkBitmap bitmap;
- bitmap.allocPixels(SkImageInfo::MakeS32(WIDTH, HEIGHT, kPremul_SkAlphaType));
- SkCanvas canvas(bitmap);
- SkPaint paint;
- SkRect rect = SkRect::MakeWH(WIDTH, HEIGHT);
- SkRandom rnd;
- while (!rect.isEmpty()) {
- paint.setColor(rnd.nextU() | (0xFF << 24));
- canvas.drawRect(rect, paint);
- rect.inset(25, 25);
- }
- return SkImage::MakeFromBitmap(bitmap);
- }
- DEF_SIMPLE_GM_BG(imagealphathreshold_image, canvas, WIDTH * 2, HEIGHT, SK_ColorBLACK) {
- sk_sp<SkImage> image(make_img());
- SkIRect rects[2];
- rects[0] = SkIRect::MakeXYWH(0, 150, WIDTH, HEIGHT - 300);
- rects[1] = SkIRect::MakeXYWH(150, 0, WIDTH - 300, HEIGHT);
- SkRegion region;
- region.setRects(rects, 2);
- SkPaint filterPaint;
- sk_sp<SkImageFilter> imageSource(SkImageSource::Make(image));
- filterPaint.setImageFilter(SkAlphaThresholdFilter::Make(region, 0.2f, 0.7f,
- std::move(imageSource)));
- canvas->saveLayer(nullptr, &filterPaint);
- canvas->restore();
- canvas->translate(WIDTH, 0);
- canvas->drawImage(image, 0, 0);
- }
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