static const GrFragmentProcessor* create_random_proc_tree(GrProcessorTestData* d,
int minLevels, int maxLevels) {
SkASSERT(1 <= minLevels);
SkASSERT(minLevels <= maxLevels);
// Return a leaf node if maxLevels is 1 or if we randomly chose to terminate.
// If returning a leaf node, make sure that it doesn't have children (e.g. another
// GrComposeEffect)
const float terminateProbability = 0.3f;
if (1 == minLevels) {
bool terminate = (1 == maxLevels) || (d->fRandom->nextF() < terminateProbability);
if (terminate) {
const GrFragmentProcessor* fp;
while (true) {
fp = GrProcessorTestFactory<GrFragmentProcessor>::Create(d);
SkASSERT(fp);
if (0 == fp->numChildProcessors()) {
break;
}
fp->unref();
}
return fp;
}
}
// If we didn't terminate, choose either the left or right subtree to fulfill
// the minLevels requirement of this tree; the other child can have as few levels as it wants.
// Also choose a random xfer mode that's supported by CreateFrom2Procs().
if (minLevels > 1) {
--minLevels;
}
SkAutoTUnref<const GrFragmentProcessor> minLevelsChild(create_random_proc_tree(d, minLevels,
maxLevels - 1));
SkAutoTUnref<const GrFragmentProcessor> otherChild(create_random_proc_tree(d, 1,
maxLevels - 1));
SkXfermode::Mode mode = static_cast<SkXfermode::Mode>(d->fRandom->nextRangeU(0,
SkXfermode::kLastCoeffMode));
const GrFragmentProcessor* fp;
if (d->fRandom->nextF() < 0.5f) {
fp = GrXfermodeFragmentProcessor::CreateFromTwoProcessors(minLevelsChild, otherChild, mode);
SkASSERT(fp);
} else {
fp = GrXfermodeFragmentProcessor::CreateFromTwoProcessors(otherChild, minLevelsChild, mode);
SkASSERT(fp);
}
return fp;
}
static std::unique_ptr<GrFragmentProcessor> create_random_proc_tree(GrProcessorTestData* d,
int minLevels, int maxLevels) {
SkASSERT(1 <= minLevels);
SkASSERT(minLevels <= maxLevels);
// Return a leaf node if maxLevels is 1 or if we randomly chose to terminate.
// If returning a leaf node, make sure that it doesn't have children (e.g. another
// GrComposeEffect)
const float terminateProbability = 0.3f;
if (1 == minLevels) {
bool terminate = (1 == maxLevels) || (d->fRandom->nextF() < terminateProbability);
if (terminate) {
std::unique_ptr<GrFragmentProcessor> fp;
while (true) {
fp = GrFragmentProcessorTestFactory::Make(d);
SkASSERT(fp);
if (0 == fp->numChildProcessors()) {
break;
}
}
return fp;
}
}
// If we didn't terminate, choose either the left or right subtree to fulfill
// the minLevels requirement of this tree; the other child can have as few levels as it wants.
// Also choose a random xfer mode.
if (minLevels > 1) {
--minLevels;
}
auto minLevelsChild = create_random_proc_tree(d, minLevels, maxLevels - 1);
std::unique_ptr<GrFragmentProcessor> otherChild(create_random_proc_tree(d, 1, maxLevels - 1));
SkBlendMode mode = static_cast<SkBlendMode>(d->fRandom->nextRangeU(0,
(int)SkBlendMode::kLastMode));
std::unique_ptr<GrFragmentProcessor> fp;
if (d->fRandom->nextF() < 0.5f) {
fp = GrXfermodeFragmentProcessor::MakeFromTwoProcessors(std::move(minLevelsChild),
std::move(otherChild), mode);
SkASSERT(fp);
} else {
fp = GrXfermodeFragmentProcessor::MakeFromTwoProcessors(std::move(otherChild),
std::move(minLevelsChild), mode);
SkASSERT(fp);
}
return fp;
}
