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| 1 /* |
| 2 * Copyright 2015 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #include "gm.h" |
| 9 #include "SkCanvas.h" |
| 10 #include "SkRSXform.h" |
| 11 #include "SkSurface.h" |
| 12 |
| 13 class DrawAtlasGM : public skiagm::GM { |
| 14 static SkImage* MakeAtlas(SkCanvas* caller, const SkRect& target) { |
| 15 SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100); |
| 16 SkAutoTUnref<SkSurface> surface(caller->newSurface(info)); |
| 17 if (NULL == surface) { |
| 18 surface.reset(SkSurface::NewRaster(info)); |
| 19 } |
| 20 SkCanvas* canvas = surface->getCanvas(); |
| 21 // draw red everywhere, but we don't expect to see it in the draw, testi
ng the notion |
| 22 // that drawAtlas draws a subset-region of the atlas. |
| 23 canvas->clear(SK_ColorRED); |
| 24 |
| 25 SkPaint paint; |
| 26 paint.setXfermodeMode(SkXfermode::kClear_Mode); |
| 27 SkRect r(target); |
| 28 r.inset(-1, -1); |
| 29 // zero out a place (with a 1-pixel border) to land our drawing. |
| 30 canvas->drawRect(r, paint); |
| 31 paint.setXfermode(NULL); |
| 32 paint.setColor(SK_ColorBLUE); |
| 33 paint.setAntiAlias(true); |
| 34 canvas->drawOval(target, paint); |
| 35 return surface->newImageSnapshot(); |
| 36 } |
| 37 |
| 38 SkAutoTUnref<SkImage> fAtlas; |
| 39 |
| 40 public: |
| 41 DrawAtlasGM() {} |
| 42 |
| 43 protected: |
| 44 |
| 45 SkString onShortName() override { |
| 46 return SkString("draw-atlas"); |
| 47 } |
| 48 |
| 49 SkISize onISize() override { |
| 50 return SkISize::Make(640, 480); |
| 51 } |
| 52 |
| 53 void onDraw(SkCanvas* canvas) override { |
| 54 const SkRect target = { 50, 50, 80, 90 }; |
| 55 if (NULL == fAtlas) { |
| 56 fAtlas.reset(MakeAtlas(canvas, target)); |
| 57 } |
| 58 |
| 59 const struct { |
| 60 SkScalar fScale; |
| 61 SkScalar fDegrees; |
| 62 SkScalar fTx; |
| 63 SkScalar fTy; |
| 64 |
| 65 void apply(SkRSXform* xform) const { |
| 66 const SkScalar rad = SkDegreesToRadians(fDegrees); |
| 67 xform->fSCos = fScale * SkScalarCos(rad); |
| 68 xform->fSSin = fScale * SkScalarSin(rad); |
| 69 xform->fTx = fTx; |
| 70 xform->fTy = fTy; |
| 71 } |
| 72 } rec[] = { |
| 73 { 1, 0, 10, 10 }, // just translate |
| 74 { 2, 0, 110, 10 }, // scale + translate |
| 75 { 1, 30, 210, 10 }, // rotate + translate |
| 76 { 2, -30, 310, 30 }, // scale + rotate + translate |
| 77 }; |
| 78 |
| 79 const int N = SK_ARRAY_COUNT(rec); |
| 80 SkRSXform xform[N]; |
| 81 SkRect tex[N]; |
| 82 SkColor colors[N]; |
| 83 |
| 84 for (int i = 0; i < N; ++i) { |
| 85 rec[i].apply(&xform[i]); |
| 86 tex[i] = target; |
| 87 colors[i] = 0x80FF0000 + (i * 40 * 256); |
| 88 } |
| 89 |
| 90 SkPaint paint; |
| 91 paint.setFilterQuality(kLow_SkFilterQuality); |
| 92 paint.setAntiAlias(true); |
| 93 |
| 94 canvas->drawAtlas(fAtlas, xform, tex, N, NULL, &paint); |
| 95 canvas->translate(0, 100); |
| 96 canvas->drawAtlas(fAtlas, xform, tex, colors, N, SkXfermode::kSrcIn_Mode
, NULL, &paint); |
| 97 } |
| 98 |
| 99 private: |
| 100 typedef GM INHERITED; |
| 101 }; |
| 102 DEF_GM( return new DrawAtlasGM; ) |
| 103 |
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