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"

#ifdef GR_TEST_UTILS

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)))];
}

const SkMatrix& TestMatrixPreservesRightAngles(SkRandom* random) {
    static SkMatrix gMatrices[4];
    static bool gOnce;
    if (!gOnce) {
        // identity
        gMatrices[0].reset();
        // translation
        gMatrices[1].setTranslate(SkIntToScalar(-100), SkIntToScalar(100));
        // scale
        gMatrices[2].setScale(SkIntToScalar(17), SkIntToScalar(17));
        // scale + translation
        gMatrices[3].setScale(SkIntToScalar(-17), SkIntToScalar(-17));
        gMatrices[3].postTranslate(SkIntToScalar(66), SkIntToScalar(-33));
        // orthogonal basis vectors
        gMatrices[4].reset();
        gMatrices[4].setScale(SkIntToScalar(-1), SkIntToScalar(-1));
        gMatrices[4].setRotate(47);
        gOnce = true;

        for (size_t i = 0; i < SK_ARRAY_COUNT(gMatrices); i++) {
            SkASSERT(gMatrices[i].preservesRightAngles());
        }
    }
    return gMatrices[random->nextULessThan(static_cast<uint32_t>(SK_ARRAY_COUNT(gMatrices)))];
}

const SkRect& TestRect(SkRandom* random) {
    static SkRect gRects[1];
    static bool gOnce;
    if (!gOnce) {
        gRects[0] = SkRect::MakeWH(1.f, 1.f);
        gRects[1] = SkRect::MakeWH(1.0f, 256.0f);
        gRects[2] = SkRect::MakeWH(256.0f, 1.0f);
        gRects[4] = SkRect::MakeLargest();
        gRects[5] = SkRect::MakeLTRB(-65535.0f, -65535.0f, 65535.0f, 65535.0f);
        gRects[6] = SkRect::MakeLTRB(10.0f, 10.0f, -10.0f, -10.0f);
        gOnce = true;
    }
    return gRects[random->nextULessThan(static_cast<uint32_t>(SK_ARRAY_COUNT(gRects)))];
}
};

#endif