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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/SkCanvas.h"
- #include "include/core/SkColor.h"
- #include "include/core/SkFilterQuality.h"
- #include "include/core/SkImage.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/SkSize.h"
- #include "include/core/SkString.h"
- #include "include/core/SkSurface.h"
- #include "include/core/SkTypes.h"
- #include "include/private/SkTArray.h"
- class ImageScaleAlignedGM : public skiagm::GM {
- protected:
- void onOnceBeforeDraw() override {
- const SkVector vectors[] = { { 1, 0 }, { 0, 1 } };
- for (size_t i = 0; i < SK_ARRAY_COUNT(vectors); ++i) {
- auto& set = fSets.push_back();
- set.fVector = vectors[i];
- set.fImages.push_back() = MakeImage(vectors[i], SK_ColorGREEN);
- set.fScales.push_back() = 1;
- set.fImages.push_back() = MakeImage(vectors[i], SK_ColorRED);
- set.fScales.push_back() = kStretchFactor;
- set.fImages.push_back() = MakeImage(vectors[i], SK_ColorGREEN);
- set.fScales.push_back() = 1;
- }
- }
- SkString onShortName() override {
- return SkString("image_scale_aligned");
- }
- SkISize onISize() override {
- return SkISize::Make(580, 780);
- }
- void onDraw(SkCanvas* canvas) override {
- struct {
- SkPoint offset;
- SkVector scale;
- } cfgs[] = {
- {{ 10, 10 }, { 1, 1 }},
- {{ 300.5f, 10 }, { 1, 1 }},
- {{ 10, 200.5f }, { 1, 1 }},
- {{ 300.5f, 200.5f }, { 1, 1 }},
- {{ 10.5f, 400.5f }, { 1, 1 }},
- {{ 550.5f, 400.5f }, { -1, 1 }},
- {{ 10.5f, 750.5f }, { 1, -1 }},
- {{ 550.5f, 750.5f }, { -1, -1 }},
- };
- for (size_t i = 0; i < SK_ARRAY_COUNT(cfgs); ++i) {
- SkAutoCanvasRestore acr(canvas, true);
- canvas->translate(cfgs[i].offset.x(), cfgs[i].offset.y());
- canvas->scale(cfgs[i].scale.x(), cfgs[i].scale.y());
- drawSets(canvas);
- }
- }
- private:
- struct ImageSet {
- SkSTArray<3, sk_sp<SkImage>, true> fImages;
- SkSTArray<3, SkScalar> fScales;
- SkVector fVector;
- };
- static sk_sp<SkImage> MakeImage(const SkVector& vec, SkColor color) {
- const SkPoint start = SkPoint::Make(vec.y() * kSegLen / 2, vec.x() * kSegLen / 2);
- const SkPoint end = SkPoint::Make(start.x() + vec.x() * (kSegLen - 1),
- start.y() + vec.y() * (kSegLen - 1));
- auto surface(SkSurface::MakeRasterN32Premul(kSegLen, kSegLen));
- surface->getCanvas()->clear(SK_ColorTRANSPARENT);
- SkPaint paint;
- paint.setAntiAlias(true);
- const SkRect border = SkRect::MakeIWH(kSegLen, kSegLen).makeInset(.5f, .5f);
- paint.setColor(SK_ColorBLUE);
- paint.setStyle(SkPaint::kStroke_Style);
- surface->getCanvas()->drawRect(border, paint);
- paint.setColor(SK_ColorBLACK);
- surface->getCanvas()->drawLine(start, end, paint);
- paint.reset();
- paint.setColor(color);
- const SkPoint pts[] = { start, end };
- surface->getCanvas()->drawPoints(SkCanvas::kPoints_PointMode, 2, pts, paint);
- return surface->makeImageSnapshot();
- }
- void drawSets(SkCanvas* canvas) const {
- SkAutoCanvasRestore acr(canvas, true);
- const SkFilterQuality filters[] = {
- kNone_SkFilterQuality,
- kLow_SkFilterQuality,
- kMedium_SkFilterQuality,
- kHigh_SkFilterQuality
- };
- const bool AAs[] = { false, true };
- SkPaint paint;
- for (int i = 0; i < fSets.count(); ++i) {
- auto& set = fSets[i];
- SkPoint lastPt;
- for (size_t j = 0; j < SK_ARRAY_COUNT(AAs); ++j) {
- paint.setAntiAlias(AAs[j]);
- for (size_t k = 0; k < SK_ARRAY_COUNT(filters); ++k) {
- paint.setFilterQuality(filters[k]);
- lastPt = drawSet(canvas, set, paint);
- canvas->translate((kSegLen + 4) * set.fVector.y(),
- (kSegLen + 4) * set.fVector.x());
- }
- }
- canvas->translate(lastPt.x() + kSegLen,
- - SkIntToScalar(kSegLen + 4) * SK_ARRAY_COUNT(filters) * SK_ARRAY_COUNT(AAs));
- }
- }
- SkPoint drawSet(SkCanvas* canvas, const ImageSet& set, const SkPaint& paint) const {
- SkASSERT(set.fImages.count() == set.fScales.count());
- SkPoint pt = SkPoint::Make(0, 0);
- for (int i = 0; i < set.fImages.count(); ++i) {
- auto& img = set.fImages[i];
- const SkRect dst =
- SkRect::MakeXYWH(pt.x(), pt.y(),
- img->width() * (1 + (set.fScales[i] - 1) * set.fVector.x()),
- img->height() * (1 + (set.fScales[i] - 1) * set.fVector.y()));
- canvas->drawImageRect(img.get(), dst, &paint);
- pt.offset(dst.width() * set.fVector.x(), dst.height() * set.fVector.y());
- }
- return pt;
- }
- static constexpr unsigned kSegLen = 15;
- static constexpr unsigned kStretchFactor = 4;
- SkSTArray<2, ImageSet> fSets;
- typedef GM INHERITED;
- };
- DEF_GM(return new ImageScaleAlignedGM();)
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