| /* |
| * 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 "include/core/SkCanvas.h" |
| #include "include/core/SkDrawable.h" |
| #include "include/core/SkFont.h" |
| #include "include/core/SkPath.h" |
| #include "include/core/SkRSXform.h" |
| #include "include/core/SkSurface.h" |
| #include "include/utils/SkRandom.h" |
| #include "include/utils/SkTextUtils.h" |
| #include "samplecode/Sample.h" |
| #include "src/core/SkPaintPriv.h" |
| |
| typedef void (*DrawAtlasProc)(SkCanvas*, SkImage*, const SkRSXform[], const SkRect[], |
| const SkColor[], int, const SkRect*, const SkSamplingOptions&, |
| const SkPaint*); |
| |
| static void draw_atlas(SkCanvas* canvas, SkImage* atlas, const SkRSXform xform[], |
| const SkRect tex[], const SkColor colors[], int count, const SkRect* cull, |
| const SkSamplingOptions& sampling, const SkPaint* paint) { |
| canvas->drawAtlas(atlas, xform, tex, colors, count, SkBlendMode::kModulate, |
| sampling, cull, paint); |
| } |
| |
| static void draw_atlas_sim(SkCanvas* canvas, SkImage* atlas, const SkRSXform xform[], |
| const SkRect tex[], const SkColor colors[], int count, const SkRect* cull, |
| const SkSamplingOptions& sampling, const SkPaint* paint) { |
| for (int i = 0; i < count; ++i) { |
| SkMatrix matrix; |
| matrix.setRSXform(xform[i]); |
| |
| canvas->save(); |
| canvas->concat(matrix); |
| canvas->drawImageRect(atlas, tex[i], tex[i].makeOffset(-tex[i].x(), -tex[i].y()), |
| sampling, paint, SkCanvas::kFast_SrcRectConstraint); |
| canvas->restore(); |
| } |
| } |
| |
| static sk_sp<SkImage> make_atlas(int atlasSize, int cellSize) { |
| SkImageInfo info = SkImageInfo::MakeN32Premul(atlasSize, atlasSize); |
| auto surface(SkSurface::MakeRaster(info)); |
| SkCanvas* canvas = surface->getCanvas(); |
| |
| SkPaint paint; |
| SkRandom rand; |
| |
| const SkScalar half = cellSize * SK_ScalarHalf; |
| const char* s = "01234567890!@#$%^&*=+<>?abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
| SkFont font(nullptr, 28); |
| |
| int i = 0; |
| for (int y = 0; y < atlasSize; y += cellSize) { |
| for (int x = 0; x < atlasSize; x += cellSize) { |
| paint.setColor(rand.nextU()); |
| paint.setAlpha(0xFF); |
| int index = i % strlen(s); |
| SkTextUtils::Draw(canvas, &s[index], 1, SkTextEncoding::kUTF8, |
| x + half, y + half + half/2, font, paint, |
| SkTextUtils::kCenter_Align); |
| i += 1; |
| } |
| } |
| return surface->makeImageSnapshot(); |
| } |
| |
| class DrawAtlasDrawable : public SkDrawable { |
| enum { |
| kMaxScale = 2, |
| kCellSize = 32, |
| kAtlasSize = 512, |
| }; |
| |
| struct Rec { |
| SkPoint fCenter; |
| SkVector fVelocity; |
| SkScalar fScale; |
| SkScalar fDScale; |
| SkScalar fRadian; |
| SkScalar fDRadian; |
| SkScalar fAlpha; |
| SkScalar fDAlpha; |
| |
| void advance(const SkRect& bounds) { |
| fCenter += fVelocity; |
| if (fCenter.fX > bounds.right()) { |
| SkASSERT(fVelocity.fX > 0); |
| fVelocity.fX = -fVelocity.fX; |
| } else if (fCenter.fX < bounds.left()) { |
| SkASSERT(fVelocity.fX < 0); |
| fVelocity.fX = -fVelocity.fX; |
| } |
| if (fCenter.fY > bounds.bottom()) { |
| if (fVelocity.fY > 0) { |
| fVelocity.fY = -fVelocity.fY; |
| } |
| } else if (fCenter.fY < bounds.top()) { |
| if (fVelocity.fY < 0) { |
| fVelocity.fY = -fVelocity.fY; |
| } |
| } |
| |
| fScale += fDScale; |
| if (fScale > 2 || fScale < SK_Scalar1/2) { |
| fDScale = -fDScale; |
| } |
| |
| fRadian += fDRadian; |
| fRadian = SkScalarMod(fRadian, 2 * SK_ScalarPI); |
| |
| fAlpha += fDAlpha; |
| if (fAlpha > 1) { |
| fAlpha = 1; |
| fDAlpha = -fDAlpha; |
| } else if (fAlpha < 0) { |
| fAlpha = 0; |
| fDAlpha = -fDAlpha; |
| } |
| } |
| |
| SkRSXform asRSXform() const { |
| return SkRSXform::MakeFromRadians(fScale, fRadian, fCenter.x(), fCenter.y(), |
| SkScalarHalf(kCellSize), SkScalarHalf(kCellSize)); |
| } |
| }; |
| |
| DrawAtlasProc fProc; |
| |
| enum { |
| N = 256, |
| }; |
| |
| sk_sp<SkImage> fAtlas; |
| Rec fRec[N]; |
| SkRect fTex[N]; |
| SkRect fBounds; |
| bool fUseColors; |
| |
| public: |
| DrawAtlasDrawable(DrawAtlasProc proc, const SkRect& r) |
| : fProc(proc), fBounds(r), fUseColors(false) |
| { |
| SkRandom rand; |
| fAtlas = make_atlas(kAtlasSize, kCellSize); |
| const SkScalar kMaxSpeed = 5; |
| const SkScalar cell = SkIntToScalar(kCellSize); |
| int i = 0; |
| for (int y = 0; y < kAtlasSize; y += kCellSize) { |
| for (int x = 0; x < kAtlasSize; x += kCellSize) { |
| const SkScalar sx = SkIntToScalar(x); |
| const SkScalar sy = SkIntToScalar(y); |
| fTex[i].setXYWH(sx, sy, cell, cell); |
| |
| fRec[i].fCenter.set(sx + cell/2, sy + 3*cell/4); |
| fRec[i].fVelocity.fX = rand.nextSScalar1() * kMaxSpeed; |
| fRec[i].fVelocity.fY = rand.nextSScalar1() * kMaxSpeed; |
| fRec[i].fScale = 1; |
| fRec[i].fDScale = rand.nextSScalar1() / 16; |
| fRec[i].fRadian = 0; |
| fRec[i].fDRadian = rand.nextSScalar1() / 8; |
| fRec[i].fAlpha = rand.nextUScalar1(); |
| fRec[i].fDAlpha = rand.nextSScalar1() / 10; |
| i += 1; |
| } |
| } |
| } |
| |
| void toggleUseColors() { |
| fUseColors = !fUseColors; |
| } |
| |
| protected: |
| void onDraw(SkCanvas* canvas) override { |
| SkRSXform xform[N]; |
| SkColor colors[N]; |
| |
| for (int i = 0; i < N; ++i) { |
| fRec[i].advance(fBounds); |
| xform[i] = fRec[i].asRSXform(); |
| if (fUseColors) { |
| colors[i] = SkColorSetARGB((int)(fRec[i].fAlpha * 0xFF), 0xFF, 0xFF, 0xFF); |
| } |
| } |
| SkPaint paint; |
| SkSamplingOptions sampling(SkFilterMode::kLinear); |
| |
| const SkRect cull = this->getBounds(); |
| const SkColor* colorsPtr = fUseColors ? colors : nullptr; |
| fProc(canvas, fAtlas.get(), xform, fTex, colorsPtr, N, &cull, sampling, &paint); |
| } |
| |
| SkRect onGetBounds() override { |
| const SkScalar border = kMaxScale * kCellSize; |
| SkRect r = fBounds; |
| r.outset(border, border); |
| return r; |
| } |
| |
| private: |
| using INHERITED = SkDrawable; |
| }; |
| |
| class DrawAtlasView : public Sample { |
| const char* fName; |
| DrawAtlasProc fProc; |
| sk_sp<DrawAtlasDrawable> fDrawable; |
| |
| public: |
| DrawAtlasView(const char name[], DrawAtlasProc proc) : fName(name), fProc(proc) { } |
| |
| protected: |
| SkString name() override { return SkString(fName); } |
| |
| bool onChar(SkUnichar uni) override { |
| switch (uni) { |
| case 'C': fDrawable->toggleUseColors(); return true; |
| default: break; |
| } |
| return false; |
| } |
| |
| void onOnceBeforeDraw() override { |
| fDrawable = sk_make_sp<DrawAtlasDrawable>(fProc, SkRect::MakeWH(640, 480)); |
| } |
| |
| void onDrawContent(SkCanvas* canvas) override { |
| canvas->drawDrawable(fDrawable.get()); |
| } |
| |
| bool onAnimate(double /*nanos*/) override { return true; } |
| #if 0 |
| // TODO: switch over to use this for our animation |
| bool onAnimate(double nanos) override { |
| SkScalar angle = SkDoubleToScalar(fmod(1e-9 * nanos * 360 / 24, 360)); |
| fAnimatingDrawable->setSweep(angle); |
| return true; |
| } |
| #endif |
| |
| private: |
| using INHERITED = Sample; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_SAMPLE( return new DrawAtlasView("DrawAtlas", draw_atlas); ) |
| DEF_SAMPLE( return new DrawAtlasView("DrawAtlasSim", draw_atlas_sim); ) |