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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrPathRange.h"
#include "SkPath.h"
enum {
kPathsPerGroup = 16 // Paths get tracked in groups of 16 for lazy loading.
};
GrPathRange::GrPathRange(GrGpu* gpu,
PathGenerator* pathGenerator,
const SkStrokeRec& stroke)
: INHERITED(gpu, kCached_LifeCycle),
fPathGenerator(SkRef(pathGenerator)),
fNumPaths(fPathGenerator->getNumPaths()),
fStroke(stroke) {
const int numGroups = (fNumPaths + kPathsPerGroup - 1) / kPathsPerGroup;
fGeneratedPaths.reset((numGroups + 7) / 8); // 1 bit per path group.
memset(&fGeneratedPaths.front(), 0, fGeneratedPaths.count());
}
GrPathRange::GrPathRange(GrGpu* gpu,
int numPaths,
const SkStrokeRec& stroke)
: INHERITED(gpu, kCached_LifeCycle),
fNumPaths(numPaths),
fStroke(stroke) {
}
void GrPathRange::willDrawPaths(const void* indices, PathIndexType indexType, int count) const {
if (!fPathGenerator) {
return;
}
switch (indexType) {
case kU8_PathIndexType: return this->willDrawPaths<uint8_t>(indices, count);
case kU16_PathIndexType: return this->willDrawPaths<uint16_t>(indices, count);
case kU32_PathIndexType: return this->willDrawPaths<uint32_t>(indices, count);
default: SkFAIL("Unknown path index type");
}
}
template<typename IndexType> void GrPathRange::willDrawPaths(const void* indices, int count) const {
SkASSERT(fPathGenerator);
const IndexType* indexArray = reinterpret_cast<const IndexType*>(indices);
bool didLoadPaths = false;
for (int i = 0; i < count; ++i) {
SkASSERT(indexArray[i] < static_cast<uint32_t>(fNumPaths));
const int groupIndex = indexArray[i] / kPathsPerGroup;
const int groupByte = groupIndex / 8;
const uint8_t groupBit = 1 << (groupIndex % 8);
const bool hasPath = SkToBool(fGeneratedPaths[groupByte] & groupBit);
if (!hasPath) {
// We track which paths are loaded in groups of kPathsPerGroup. To
// mark a path as loaded we need to load the entire group.
const int groupFirstPath = groupIndex * kPathsPerGroup;
const int groupLastPath = SkTMin(groupFirstPath + kPathsPerGroup, fNumPaths) - 1;
SkPath path;
for (int pathIdx = groupFirstPath; pathIdx <= groupLastPath; ++pathIdx) {
fPathGenerator->generatePath(pathIdx, &path);
this->onInitPath(pathIdx, path);
}
fGeneratedPaths[groupByte] |= groupBit;
didLoadPaths = true;
}
}
if (didLoadPaths) {
this->didChangeGpuMemorySize();
}
}
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