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| 1 /* |
| 2 * Copyright 2013 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 "SkCanvas.h" |
| 9 #include "SkColor.h" |
| 10 #include "SkGradientShader.h" |
| 11 #include "SkMatrix.h" |
| 12 #include "SkPaint.h" |
| 13 #include "SkPoint.h" |
| 14 #include "SkRect.h" |
| 15 #include "SkRefCnt.h" |
| 16 #include "SkScalar.h" |
| 17 #include "SkSize.h" |
| 18 #include "SkString.h" |
| 19 |
| 20 #include "gm.h" |
| 21 |
| 22 static const SkColor gColors[] = { |
| 23 SK_ColorRED, SK_ColorYELLOW |
| 24 }; |
| 25 |
| 26 // these arrays define the gradient stop points |
| 27 // as x1, y1, x2, y2 per gradient to draw |
| 28 static const SkPoint linearPts[][2] = { |
| 29 {{0, 0}, {1, 0}}, |
| 30 {{0, 0}, {0, 1}}, |
| 31 {{1, 0}, {0, 0}}, |
| 32 {{0, 1}, {0, 0}}, |
| 33 |
| 34 {{0, 0}, {1, 1}}, |
| 35 {{1, 1}, {0, 0}}, |
| 36 {{1, 0}, {0, 1}}, |
| 37 {{0, 1}, {1, 0}} |
| 38 }; |
| 39 |
| 40 static const SkScalar TESTGRID_X = 200; // pixels allocated to each image in
x dimension |
| 41 static const SkScalar TESTGRID_Y = 200; // pixels allocated to each image in
y dimension |
| 42 |
| 43 static const int IMAGES_X = 4; // number of images per row |
| 44 |
| 45 static SkShader* make_linear_gradient(const SkPoint pts[2]) { |
| 46 return SkGradientShader::CreateLinear(pts, gColors, NULL, SK_ARRAY_COUNT(gCo
lors), |
| 47 SkShader::kClamp_TileMode, NULL); |
| 48 } |
| 49 |
| 50 static void draw_gradients(SkCanvas* canvas, SkShader* (*makeShader)(const SkPoi
nt[2]), |
| 51 const SkPoint ptsArray[][2], int numImages) { |
| 52 // Use some nice prime numbers for the rectangle and matrix with |
| 53 // different scaling along the x and y axes (which is the bug this |
| 54 // test addresses, where incorrect order of operations mixed up the axes) |
| 55 SkRect rectGrad = { 43, 61, 181, 167 }; |
| 56 SkMatrix shaderMat; |
| 57 shaderMat.setScale(rectGrad.width(), rectGrad.height()); |
| 58 shaderMat.postTranslate(rectGrad.left(), rectGrad.top()); |
| 59 |
| 60 canvas->save(); |
| 61 for (int i = 0; i < numImages; i++) { |
| 62 // Advance line downwards if necessary. |
| 63 if (i % IMAGES_X == 0 && i != 0) { |
| 64 canvas->restore(); |
| 65 canvas->translate(0, TESTGRID_Y); |
| 66 canvas->save(); |
| 67 } |
| 68 |
| 69 // Setup shader and draw. |
| 70 SkAutoTUnref<SkShader> shader(makeShader(*ptsArray)); |
| 71 shader->setLocalMatrix(shaderMat); |
| 72 |
| 73 SkPaint paint; |
| 74 paint.setShader(shader); |
| 75 canvas->drawRect(rectGrad, paint); |
| 76 |
| 77 // Advance to next position. |
| 78 canvas->translate(TESTGRID_X, 0); |
| 79 ptsArray++; |
| 80 } |
| 81 canvas->restore(); |
| 82 } |
| 83 |
| 84 namespace skiagm { |
| 85 |
| 86 class GradientMatrixGM : public GM { |
| 87 public: |
| 88 GradientMatrixGM() { |
| 89 this->setBGColor(0xFFDDDDDD); |
| 90 } |
| 91 |
| 92 protected: |
| 93 SkString onShortName() SK_OVERRIDE { |
| 94 return SkString("gradient_matrix"); |
| 95 } |
| 96 |
| 97 virtual SkISize onISize() SK_OVERRIDE { |
| 98 return SkISize::Make(800, 800); |
| 99 } |
| 100 |
| 101 virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE { |
| 102 draw_gradients(canvas, &make_linear_gradient, |
| 103 linearPts, SK_ARRAY_COUNT(linearPts)); |
| 104 } |
| 105 |
| 106 private: |
| 107 typedef GM INHERITED; |
| 108 }; |
| 109 |
| 110 DEF_GM( return new GradientMatrixGM; ) |
| 111 } |
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