本文整理汇总了C++中GrMatrix::getMaxStretch方法的典型用法代码示例。如果您正苦于以下问题：C++ GrMatrix::getMaxStretch方法的具体用法？C++ GrMatrix::getMaxStretch怎么用？C++ GrMatrix::getMaxStretch使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类GrMatrix的用法示例。
在下文中一共展示了GrMatrix::getMaxStretch方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: onDrawPath
void GrDefaultPathRenderer::onDrawPath(GrDrawTarget* target,
GrDrawTarget::StageBitfield stages,
const GrPath& path,
GrPathFill fill,
const GrPoint* translate,
bool stencilOnly) {
GrDrawTarget::AutoStateRestore asr(target);
bool colorWritesWereDisabled = target->isColorWriteDisabled();
// face culling doesn't make sense here
GrAssert(GrDrawTarget::kBoth_DrawFace == target->getDrawFace());
GrMatrix viewM = target->getViewMatrix();
// In order to tesselate the path we get a bound on how much the matrix can
// stretch when mapping to screen coordinates.
GrScalar stretch = viewM.getMaxStretch();
bool useStretch = stretch > 0;
GrScalar tol = fCurveTolerance;
if (!useStretch) {
// TODO: deal with perspective in some better way.
tol /= 10;
} else {
tol = GrScalarDiv(tol, stretch);
}
GrScalar tolSqd = GrMul(tol, tol);
int subpathCnt;
int maxPts = GrPathUtils::worstCasePointCount(path, &subpathCnt, tol);
GrVertexLayout layout = 0;
for (int s = 0; s < GrDrawTarget::kNumStages; ++s) {
if ((1 << s) & stages) {
layout |= GrDrawTarget::StagePosAsTexCoordVertexLayoutBit(s);
}
}
// add 4 to hold the bounding rect
GrDrawTarget::AutoReleaseGeometry arg(target, layout, maxPts + 4, 0);
GrPoint* base = (GrPoint*) arg.vertices();
GrPoint* vert = base;
GrPoint* subpathBase = base;
GrAutoSTMalloc<8, uint16_t> subpathVertCount(subpathCnt);
// TODO: use primitve restart if available rather than multiple draws
GrPrimitiveType type;
int passCount = 0;
const GrStencilSettings* passes[3];
GrDrawTarget::DrawFace drawFace[3];
bool reverse = false;
bool lastPassIsBounds;
if (kHairLine_PathFill == fill) {
type = kLineStrip_PrimitiveType;
passCount = 1;
if (stencilOnly) {
passes[0] = &gDirectToStencil;
} else {
passes[0] = NULL;
}
lastPassIsBounds = false;
drawFace[0] = GrDrawTarget::kBoth_DrawFace;
} else {
type = kTriangleFan_PrimitiveType;
if (single_pass_path(*target, path, fill)) {
passCount = 1;
if (stencilOnly) {
passes[0] = &gDirectToStencil;
} else {
passes[0] = NULL;
}
drawFace[0] = GrDrawTarget::kBoth_DrawFace;
lastPassIsBounds = false;
} else {
switch (fill) {
case kInverseEvenOdd_PathFill:
reverse = true;
// fallthrough
case kEvenOdd_PathFill:
passes[0] = &gEOStencilPass;
if (stencilOnly) {
passCount = 1;
lastPassIsBounds = false;
} else {
passCount = 2;
lastPassIsBounds = true;
if (reverse) {
passes[1] = &gInvEOColorPass;
} else {
passes[1] = &gEOColorPass;
}
}
drawFace[0] = drawFace[1] = GrDrawTarget::kBoth_DrawFace;
break;
case kInverseWinding_PathFill:
reverse = true;
// fallthrough
//.........这里部分代码省略.........