438b0d754d
This reverts commit 2c770271e6.
BUG=skia:
TBR=
Review URL: https://codereview.chromium.org/811753003
110 lines
2.9 KiB
C++
110 lines
2.9 KiB
C++
/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkRandom.h"
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#include "Test.h"
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#include "gradients/SkClampRange.h"
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static skiatest::Reporter* gReporter;
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#define R_ASSERT(cond) if (!(cond)) { \
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SkDebugf("%d: %s\n", __LINE__, #cond); \
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REPORTER_ASSERT(gReporter, cond); \
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}
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// Arbitrary sentinel values outside [0, 0xFFFF].
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static const int kV0 = -42, kV1 = -53, kRamp = -64;
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static void check_value(int64_t bigfx, int expected) {
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if (bigfx < 0) {
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R_ASSERT(expected == kV0);
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} else if (bigfx > kFracMax_SkGradFixed) {
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R_ASSERT(expected == kV1);
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} else if (bigfx == kFracMax_SkGradFixed) {
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// Either one is fine (and we do see both).
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R_ASSERT(expected == kV1 || expected == kRamp);
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} else {
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R_ASSERT(expected == kRamp);
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}
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}
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static void slow_check(const SkClampRange& range,
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const SkGradFixed fx, SkGradFixed dx, int count) {
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SkASSERT(range.fCount0 + range.fCount1 + range.fCount2 == count);
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// If dx is large, fx will overflow if updated naively. So we use more bits.
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int64_t bigfx = fx;
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for (int i = 0; i < range.fCount0; i++) {
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check_value(bigfx, range.fV0);
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bigfx += dx;
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}
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for (int i = 0; i < range.fCount1; i++) {
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check_value(bigfx, kRamp);
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bigfx += dx;
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}
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for (int i = 0; i < range.fCount2; i++) {
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check_value(bigfx, range.fV1);
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bigfx += dx;
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}
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}
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static void test_range(SkFixed fx, SkFixed dx, int count) {
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const SkGradFixed gfx = SkFixedToGradFixed(fx);
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const SkGradFixed gdx = SkFixedToGradFixed(dx);
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SkClampRange range;
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range.init(gfx, gdx, count, kV0, kV1);
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slow_check(range, gfx, gdx, count);
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}
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#define ff(x) SkIntToFixed(x)
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DEF_TEST(ClampRange, reporter) {
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gReporter = reporter;
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test_range(0, 0, 20);
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test_range(0xFFFF, 0, 20);
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test_range(-ff(2), 0, 20);
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test_range( ff(2), 0, 20);
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test_range(-10, 1, 20);
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test_range(10, -1, 20);
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test_range(-10, 3, 20);
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test_range(10, -3, 20);
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test_range(ff(1), ff(16384), 100);
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test_range(ff(-1), ff(-16384), 100);
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test_range(ff(1)/2, ff(16384), 100);
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// TODO(reed): skia:2481, fix whatever bug this is, then uncomment
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//test_range(ff(1)/2, ff(-16384), 100);
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SkRandom rand;
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// test non-overflow cases
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for (int i = 0; i < 1000000; i++) {
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SkFixed fx = rand.nextS() >> 1;
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SkFixed sx = rand.nextS() >> 1;
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int count = rand.nextU() % 1000 + 1;
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SkFixed dx = (sx - fx) / count;
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test_range(fx, dx, count);
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}
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// TODO(reed): skia:2481, fix whatever bug this is, then uncomment
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/*
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// test overflow cases
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for (int i = 0; i < 100000; i++) {
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SkFixed fx = rand.nextS();
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SkFixed dx = rand.nextS();
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int count = rand.nextU() % 1000 + 1;
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test_range(fx, dx, count);
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}
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*/
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}
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