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- /*
- * 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 "gm/gm.h"
- #include "include/core/SkCanvas.h"
- #include "include/core/SkColor.h"
- #include "include/core/SkMatrix.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkPoint.h"
- #include "include/core/SkRect.h"
- #include "include/core/SkRefCnt.h"
- #include "include/core/SkScalar.h"
- #include "include/core/SkShader.h"
- #include "include/core/SkTileMode.h"
- #include "include/core/SkTypes.h"
- #include "include/effects/SkGradientShader.h"
- constexpr SkColor gColors[] = {
- SK_ColorRED, SK_ColorYELLOW
- };
- // These annoying defines are necessary, because the only other alternative
- // is to use SkIntToScalar(...) everywhere.
- constexpr SkScalar sZero = 0;
- constexpr SkScalar sHalf = SK_ScalarHalf;
- constexpr SkScalar sOne = SK_Scalar1;
- // These arrays define the gradient stop points
- // as x1, y1, x2, y2 per gradient to draw.
- constexpr SkPoint linearPts[][2] = {
- {{sZero, sZero}, {sOne, sZero}},
- {{sZero, sZero}, {sZero, sOne}},
- {{sOne, sZero}, {sZero, sZero}},
- {{sZero, sOne}, {sZero, sZero}},
- {{sZero, sZero}, {sOne, sOne}},
- {{sOne, sOne}, {sZero, sZero}},
- {{sOne, sZero}, {sZero, sOne}},
- {{sZero, sOne}, {sOne, sZero}}
- };
- constexpr SkPoint radialPts[][2] = {
- {{sZero, sHalf}, {sOne, sHalf}},
- {{sHalf, sZero}, {sHalf, sOne}},
- {{sOne, sHalf}, {sZero, sHalf}},
- {{sHalf, sOne}, {sHalf, sZero}},
- {{sZero, sZero}, {sOne, sOne}},
- {{sOne, sOne}, {sZero, sZero}},
- {{sOne, sZero}, {sZero, sOne}},
- {{sZero, sOne}, {sOne, sZero}}
- };
- // These define the pixels allocated to each gradient image.
- constexpr SkScalar TESTGRID_X = SkIntToScalar(200);
- constexpr SkScalar TESTGRID_Y = SkIntToScalar(200);
- constexpr int IMAGES_X = 4; // number of images per row
- static sk_sp<SkShader> make_linear_gradient(const SkPoint pts[2], const SkMatrix& localMatrix) {
- return SkGradientShader::MakeLinear(pts, gColors, nullptr, SK_ARRAY_COUNT(gColors),
- SkTileMode::kClamp, 0, &localMatrix);
- }
- static sk_sp<SkShader> make_radial_gradient(const SkPoint pts[2], const SkMatrix& localMatrix) {
- SkPoint center;
- center.set(SkScalarAve(pts[0].fX, pts[1].fX),
- SkScalarAve(pts[0].fY, pts[1].fY));
- float radius = (center - pts[0]).length();
- return SkGradientShader::MakeRadial(center, radius, gColors, nullptr, SK_ARRAY_COUNT(gColors),
- SkTileMode::kClamp, 0, &localMatrix);
- }
- static void draw_gradients(SkCanvas* canvas,
- sk_sp<SkShader> (*makeShader)(const SkPoint[2], const SkMatrix&),
- 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 = {
- SkIntToScalar(43), SkIntToScalar(61),
- SkIntToScalar(181), SkIntToScalar(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();
- }
- SkPaint paint;
- paint.setShader(makeShader(*ptsArray, shaderMat));
- canvas->drawRect(rectGrad, paint);
- // Advance to next position.
- canvas->translate(TESTGRID_X, 0);
- ptsArray++;
- }
- canvas->restore();
- }
- DEF_SIMPLE_GM_BG(gradient_matrix, canvas, 800, 800, 0xFFDDDDDD) {
- draw_gradients(canvas, &make_linear_gradient,
- linearPts, SK_ARRAY_COUNT(linearPts));
- canvas->translate(0, TESTGRID_Y);
- draw_gradients(canvas, &make_radial_gradient,
- radialPts, SK_ARRAY_COUNT(radialPts));
- }
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