| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkCanvas.h" |
| #include "SkColor.h" |
| #include "SkGradientShader.h" |
| #include "SkMatrix.h" |
| #include "SkPaint.h" |
| #include "SkPoint.h" |
| #include "SkRect.h" |
| #include "SkRefCnt.h" |
| #include "SkScalar.h" |
| #include "SkSize.h" |
| #include "SkString.h" |
| |
| #include "gm.h" |
| |
| static const SkColor gColors[] = { |
| SK_ColorRED, SK_ColorYELLOW |
| }; |
| |
| // these arrays define the gradient stop points |
| // as x1, y1, x2, y2 per gradient to draw |
| static const SkPoint linearPts[][2] = { |
| {{0, 0}, {1, 0}}, |
| {{0, 0}, {0, 1}}, |
| {{1, 0}, {0, 0}}, |
| {{0, 1}, {0, 0}}, |
| |
| {{0, 0}, {1, 1}}, |
| {{1, 1}, {0, 0}}, |
| {{1, 0}, {0, 1}}, |
| {{0, 1}, {1, 0}} |
| }; |
| |
| static const SkScalar TESTGRID_X = 200; // pixels allocated to each image in x dimension |
| static const SkScalar TESTGRID_Y = 200; // pixels allocated to each image in y dimension |
| |
| static const int IMAGES_X = 4; // number of images per row |
| |
| static SkShader* make_linear_gradient(const SkPoint pts[2]) { |
| return SkGradientShader::CreateLinear(pts, gColors, NULL, SK_ARRAY_COUNT(gColors), |
| SkShader::kClamp_TileMode, NULL); |
| } |
| |
| static void draw_gradients(SkCanvas* canvas, SkShader* (*makeShader)(const SkPoint[2]), |
| const SkPoint ptsArray[][2], int numImages) { |
| // Use some nice prime numbers for the rectangle and matrix with |
| // different scaling along the x and y axes (which is the bug this |
| // test addresses, where incorrect order of operations mixed up the axes) |
| SkRect rectGrad = { 43, 61, 181, 167 }; |
| SkMatrix shaderMat; |
| shaderMat.setScale(rectGrad.width(), rectGrad.height()); |
| shaderMat.postTranslate(rectGrad.left(), rectGrad.top()); |
| |
| canvas->save(); |
| for (int i = 0; i < numImages; i++) { |
| // Advance line downwards if necessary. |
| if (i % IMAGES_X == 0 && i != 0) { |
| canvas->restore(); |
| canvas->translate(0, TESTGRID_Y); |
| canvas->save(); |
| } |
| |
| // Setup shader and draw. |
| SkAutoTUnref<SkShader> shader(makeShader(*ptsArray)); |
| shader->setLocalMatrix(shaderMat); |
| |
| SkPaint paint; |
| paint.setShader(shader); |
| canvas->drawRect(rectGrad, paint); |
| |
| // Advance to next position. |
| canvas->translate(TESTGRID_X, 0); |
| ptsArray++; |
| } |
| canvas->restore(); |
| } |
| |
| namespace skiagm { |
| |
| class GradientMatrixGM : public GM { |
| public: |
| GradientMatrixGM() { |
| this->setBGColor(0xFFDDDDDD); |
| } |
| |
| protected: |
| SkString onShortName() SK_OVERRIDE { |
| return SkString("gradient_matrix"); |
| } |
| |
| virtual SkISize onISize() SK_OVERRIDE { |
| return SkISize::Make(800, 800); |
| } |
| |
| virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE { |
| draw_gradients(canvas, &make_linear_gradient, |
| linearPts, SK_ARRAY_COUNT(linearPts)); |
| } |
| |
| private: |
| typedef GM INHERITED; |
| }; |
| |
| DEF_GM( return new GradientMatrixGM; ) |
| } |