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- /*
- * Copyright 2019 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/SkFont.h"
- #include "include/core/SkFontTypes.h"
- #include "include/core/SkImage.h"
- #include "include/core/SkMatrix.h"
- #include "include/core/SkMatrix44.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkRRect.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 "tools/timer/TimeUtils.h"
- // Mimics https://output.jsbin.com/falefice/1/quiet?CC_POSTER_CIRCLE, which can't be captured as
- // an SKP due to many 3D layers being composited post-SKP capture.
- // See skbug.com/9028
- class PosterCircleGM : public skiagm::GM {
- public:
- PosterCircleGM() : fTime(0.f) {}
- protected:
- SkString onShortName() override {
- return SkString("poster_circle");
- }
- SkISize onISize() override {
- return SkISize::Make(kStageWidth, kStageHeight + 50);
- }
- bool onAnimate(double nanos) override {
- fTime = TimeUtils::Scaled(1e-9 * nanos, 0.5f);
- return true;
- }
- void onOnceBeforeDraw() override {
- SkFont font;
- font.setEdging(SkFont::Edging::kAntiAlias);
- font.setEmbolden(true);
- font.setSize(24.f);
- sk_sp<SkSurface> surface = SkSurface::MakeRasterN32Premul(kPosterSize, kPosterSize);
- for (int i = 0; i < kNumAngles; ++i) {
- SkCanvas* canvas = surface->getCanvas();
- SkPaint fillPaint;
- fillPaint.setAntiAlias(true);
- fillPaint.setColor(i % 2 == 0 ? SkColorSetRGB(0x99, 0x5C, 0x7F)
- : SkColorSetRGB(0x83, 0x5A, 0x99));
- canvas->drawRRect(SkRRect::MakeRectXY(SkRect::MakeWH(kPosterSize, kPosterSize),
- 10.f, 10.f), fillPaint);
- SkString label;
- label.printf("%d", i);
- SkRect labelBounds;
- font.measureText(label.c_str(), label.size(), SkTextEncoding::kUTF8, &labelBounds);
- SkScalar labelX = 0.5f * kPosterSize - 0.5f * labelBounds.width();
- SkScalar labelY = 0.5f * kPosterSize + 0.5f * labelBounds.height();
- SkPaint labelPaint;
- labelPaint.setAntiAlias(true);
- canvas->drawString(label, labelX, labelY, font, labelPaint);
- fPosterImages[i] = surface->makeImageSnapshot();
- }
- }
- void onDraw(SkCanvas* canvas) override {
- // See https://developer.mozilla.org/en-US/docs/Web/CSS/transform-function/perspective
- // for projection matrix when --webkit-perspective: 800px is used.
- SkMatrix44 proj(SkMatrix44::kIdentity_Constructor);
- proj.set(3, 2, -1.f / 800.f);
- for (int pass = 0; pass < 2; ++pass) {
- // Want to draw 90 to 270 first (the back), then 270 to 90 (the front), but do all 3
- // rings backsides, then their frontsides since the front projections overlap across
- // rings. Note: we skip the poster circle's x axis rotation because that complicates the
- // back-to-front drawing order and it isn't necessary to trigger draws aligned with Z.
- bool drawFront = pass > 0;
- for (int y = 0; y < 3; ++y) {
- float ringY = (y - 1) * (kPosterSize + 10.f);
- for (int i = 0; i < kNumAngles; ++i) {
- // Add an extra 45 degree rotation, which triggers the bug by aligning some of
- // the posters with the z axis.
- SkScalar yDuration = 5.f - y;
- SkScalar yRotation = SkScalarMod(kAngleStep * i +
- 360.f * SkScalarMod(fTime / yDuration, yDuration), 360.f);
- // These rotation limits were chosen manually to line up with current projection
- static constexpr SkScalar kBackMinAngle = 70.f;
- static constexpr SkScalar kBackMaxAngle = 290.f;
- if (drawFront) {
- if (yRotation >= kBackMinAngle && yRotation <= kBackMaxAngle) {
- // Back portion during a front draw
- continue;
- }
- } else {
- if (yRotation < kBackMinAngle || yRotation > kBackMaxAngle) {
- // Front portion during a back draw
- continue;
- }
- }
- canvas->save();
- // Matrix matches transform: rotateY(<angle>deg) translateZ(200px); nested in an
- // element with the perspective projection matrix above.
- SkMatrix44 model;
- // No post/preRotate, so start with rotation matrix and adjust from there
- model.setRotateAboutUnit(0.f, 1.f, 0.f, SkDegreesToRadians(yRotation));
- model.preTranslate(0.f, 0.f, kRingRadius); // *before* rotation
- model.postTranslate(0.f, ringY, 0.f); // *after* rotation
- model.postConcat(proj);
- model.postTranslate(0.5f * kStageWidth, 0.5f * kStageHeight + 25, 0.f);
- // Flatten the 4x4 matrix by discarding the 3rd row and column
- canvas->concat(SkMatrix::MakeAll(
- model.get(0, 0), model.get(0, 1), model.get(0, 3),
- model.get(1, 0), model.get(1, 1), model.get(1, 3),
- model.get(3, 0), model.get(3, 1), model.get(3, 3)));
- SkRect poster = SkRect::MakeLTRB(-0.5f * kPosterSize, -0.5f * kPosterSize,
- 0.5f * kPosterSize, 0.5f * kPosterSize);
- SkPaint fillPaint;
- fillPaint.setAntiAlias(true);
- fillPaint.setAlphaf(0.7f);
- fillPaint.setFilterQuality(kLow_SkFilterQuality);
- canvas->drawImageRect(fPosterImages[i], poster, &fillPaint);
- canvas->restore();
- }
- }
- }
- }
- private:
- static const int kAngleStep = 30;
- static const int kNumAngles = 12; // 0 through 330 degrees
- static const int kStageWidth = 600;
- static const int kStageHeight = 400;
- static const int kRingRadius = 200;
- static const int kPosterSize = 100;
- sk_sp<SkImage> fPosterImages[kNumAngles];
- SkScalar fTime;
- };
- DEF_GM(return new PosterCircleGM();)
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