| /* |
| * 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.h" |
| #include "SkCanvas.h" |
| #include "SkRSXform.h" |
| #include "SkSurface.h" |
| |
| class DrawAtlasGM : public skiagm::GM { |
| static sk_sp<SkImage> MakeAtlas(SkCanvas* caller, const SkRect& target) { |
| SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100); |
| auto surface(caller->makeSurface(info)); |
| if (nullptr == surface) { |
| surface = SkSurface::MakeRaster(info); |
| } |
| SkCanvas* canvas = surface->getCanvas(); |
| // draw red everywhere, but we don't expect to see it in the draw, testing the notion |
| // that drawAtlas draws a subset-region of the atlas. |
| canvas->clear(SK_ColorRED); |
| |
| SkPaint paint; |
| paint.setXfermodeMode(SkXfermode::kClear_Mode); |
| SkRect r(target); |
| r.inset(-1, -1); |
| // zero out a place (with a 1-pixel border) to land our drawing. |
| canvas->drawRect(r, paint); |
| paint.setXfermode(nullptr); |
| paint.setColor(SK_ColorBLUE); |
| paint.setAntiAlias(true); |
| canvas->drawOval(target, paint); |
| return surface->makeImageSnapshot(); |
| } |
| |
| sk_sp<SkImage> fAtlas; |
| |
| public: |
| DrawAtlasGM() {} |
| |
| protected: |
| |
| SkString onShortName() override { |
| return SkString("draw-atlas"); |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(640, 480); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| const SkRect target = { 50, 50, 80, 90 }; |
| if (nullptr == fAtlas) { |
| fAtlas = MakeAtlas(canvas, target); |
| } |
| |
| const struct { |
| SkScalar fScale; |
| SkScalar fDegrees; |
| SkScalar fTx; |
| SkScalar fTy; |
| |
| void apply(SkRSXform* xform) const { |
| const SkScalar rad = SkDegreesToRadians(fDegrees); |
| xform->fSCos = fScale * SkScalarCos(rad); |
| xform->fSSin = fScale * SkScalarSin(rad); |
| xform->fTx = fTx; |
| xform->fTy = fTy; |
| } |
| } rec[] = { |
| { 1, 0, 10, 10 }, // just translate |
| { 2, 0, 110, 10 }, // scale + translate |
| { 1, 30, 210, 10 }, // rotate + translate |
| { 2, -30, 310, 30 }, // scale + rotate + translate |
| }; |
| |
| const int N = SK_ARRAY_COUNT(rec); |
| SkRSXform xform[N]; |
| SkRect tex[N]; |
| SkColor colors[N]; |
| |
| for (int i = 0; i < N; ++i) { |
| rec[i].apply(&xform[i]); |
| tex[i] = target; |
| colors[i] = 0x80FF0000 + (i * 40 * 256); |
| } |
| |
| SkPaint paint; |
| paint.setFilterQuality(kLow_SkFilterQuality); |
| paint.setAntiAlias(true); |
| |
| canvas->drawAtlas(fAtlas.get(), xform, tex, N, nullptr, &paint); |
| canvas->translate(0, 100); |
| canvas->drawAtlas(fAtlas.get(), xform, tex, colors, N, SkXfermode::kSrcIn_Mode, nullptr, &paint); |
| } |
| |
| private: |
| typedef GM INHERITED; |
| }; |
| DEF_GM( return new DrawAtlasGM; ) |
| |