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      1 #include "Test.h"
      2 #include "SkClampRange.h"
      3 #include "SkRandom.h"
      4 
      5 static skiatest::Reporter* gReporter;
      6 
      7 static void debug_me() {
      8     if (NULL == gReporter) {
      9         SkDebugf("dsfdssd\n");
     10     }
     11 }
     12 
     13 #ifdef USE_REPORTER
     14 
     15 #define R_ASSERT(cond)                  \
     16     do { if (!(cond)) {                 \
     17     debug_me();                         \
     18     REPORTER_ASSERT(gReporter, cond);   \
     19     }} while (0)
     20 
     21 #else
     22 #define R_ASSERT(cond)                  \
     23     do { if (!(cond)) {                 \
     24     debug_me();                         \
     25     }} while (0)
     26 #endif
     27 
     28 static int classify_value(SkFixed fx, int v0, int v1) {
     29     if (fx <= 0) {
     30         return v0;
     31     }
     32     if (fx >= 0xFFFF) {
     33         return v1;
     34     }
     35     R_ASSERT(false);
     36     return 0;
     37 }
     38 
     39 #define V0  -42
     40 #define V1  1024
     41 
     42 static void slow_check(const SkClampRange& range,
     43                        SkFixed fx, SkFixed dx, int count) {
     44     SkASSERT(range.fCount0 + range.fCount1 + range.fCount2 == count);
     45 
     46     int i;
     47     if (range.fOverflowed) {
     48         fx = range.fFx1;
     49         for (i = 0; i < range.fCount1; i++) {
     50             R_ASSERT(fx >= 0 && fx <= 0xFFFF);
     51             fx += dx;
     52         }
     53     } else {
     54         for (i = 0; i < range.fCount0; i++) {
     55             int v = classify_value(fx, V0, V1);
     56             R_ASSERT(v == range.fV0);
     57             fx += dx;
     58         }
     59         if (range.fCount1 > 0 && fx != range.fFx1) {
     60             SkDebugf("%x %x\n", fx, range.fFx1);
     61             R_ASSERT(!"bad fFx1");
     62             return;
     63         }
     64         for (i = 0; i < range.fCount1; i++) {
     65             R_ASSERT(fx >= 0 && fx <= 0xFFFF);
     66             fx += dx;
     67         }
     68         for (i = 0; i < range.fCount2; i++) {
     69             int v = classify_value(fx, V0, V1);
     70             R_ASSERT(v == range.fV1);
     71             fx += dx;
     72         }
     73     }
     74 }
     75 
     76 static void test_range(SkFixed fx, SkFixed dx, int count) {
     77     SkClampRange range;
     78     range.init(fx, dx, count, V0, V1);
     79     slow_check(range, fx, dx, count);
     80 }
     81 
     82 #define ff(x)   SkIntToFixed(x)
     83 
     84 void TestClampRange(skiatest::Reporter* reporter);
     85 void TestClampRange(skiatest::Reporter* reporter) {
     86     gReporter = reporter;
     87 
     88     test_range(0, 0, 20);
     89     test_range(0xFFFF, 0, 20);
     90     test_range(-ff(2), 0, 20);
     91     test_range( ff(2), 0, 20);
     92 
     93     test_range(-10, 1, 20);
     94     test_range(10, -1, 20);
     95     test_range(-10, 3, 20);
     96     test_range(10, -3, 20);
     97 
     98     test_range(ff(1),  ff(16384),  100);
     99     test_range(ff(-1), ff(-16384), 100);
    100     test_range(ff(1)/2, ff(16384), 100);
    101     test_range(ff(1)/2, ff(-16384), 100);
    102 
    103     SkRandom rand;
    104 
    105     // test non-overflow cases
    106     for (int i = 0; i < 1000000; i++) {
    107         SkFixed fx = rand.nextS() >> 1;
    108         SkFixed sx = rand.nextS() >> 1;
    109         int count = rand.nextU() % 1000 + 1;
    110         SkFixed dx = (sx - fx) / count;
    111         test_range(fx, dx, count);
    112     }
    113 
    114     // test overflow cases
    115     for (int i = 0; i < 100000; i++) {
    116         SkFixed fx = rand.nextS();
    117         SkFixed dx = rand.nextS();
    118         int count = rand.nextU() % 1000 + 1;
    119         test_range(fx, dx, count);
    120     }
    121 }
    122 
    123 #ifdef USE_REPORTER
    124 
    125 #include "TestClassDef.h"
    126 DEFINE_TESTCLASS("ClampRange", ClampRangeClass, TestClampRange)
    127 
    128 #endif
    129