src/gpu/GrTestUtils.cpp

/*
 * 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 "GrTestUtils.h"
#include "SkMatrix.h"

namespace GrTest {
const SkMatrix& TestMatrix(SkRandom* random) {
    static SkMatrix gMatrices[5];
    static bool gOnce;
    if (!gOnce) {
        gMatrices[0].reset();
        gMatrices[1].setTranslate(SkIntToScalar(-100), SkIntToScalar(100));
        gMatrices[2].setRotate(SkIntToScalar(17));
        gMatrices[3].setRotate(SkIntToScalar(185));
        gMatrices[3].postTranslate(SkIntToScalar(66), SkIntToScalar(-33));
        gMatrices[3].postScale(SkIntToScalar(2), SK_ScalarHalf);
        gMatrices[4].setRotate(SkIntToScalar(215));
        gMatrices[4].set(SkMatrix::kMPersp0, 0.00013f);
        gMatrices[4].set(SkMatrix::kMPersp1, -0.000039f);
        gOnce = true;
    }
    return gMatrices[random->nextULessThan(static_cast<uint32_t>(SK_ARRAY_COUNT(gMatrices)))];
}
};