本文整理汇总了C++中FilterEffectRenderer::prepare方法的典型用法代码示例。如果您正苦于以下问题：C++ FilterEffectRenderer::prepare方法的具体用法？C++ FilterEffectRenderer::prepare怎么用？C++ FilterEffectRenderer::prepare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FilterEffectRenderer的用法示例。
在下文中一共展示了FilterEffectRenderer::prepare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: beginFilterEffect
GraphicsContext* FilterEffectRendererHelper::beginFilterEffect(RenderLayer* renderLayer, GraphicsContext* oldContext, const LayoutRect& filterRect)
{
ASSERT(m_haveFilterEffect && renderLayer->filter());
m_savedGraphicsContext = oldContext;
m_renderLayer = renderLayer;
m_paintOffset = filterRect.location();
FloatRect filterSourceRect = filterRect;
filterSourceRect.setLocation(LayoutPoint());
FilterEffectRenderer* filter = renderLayer->filter();
filter->updateBackingStore(filterSourceRect);
filter->prepare();
// Paint into the context that represents the SourceGraphic of the filter.
GraphicsContext* sourceGraphicsContext = filter->inputContext();
if (!sourceGraphicsContext) {
// Could not allocate a new graphics context. Disable the filters and continue.
m_haveFilterEffect = false;
return m_savedGraphicsContext;
}
sourceGraphicsContext->save();
sourceGraphicsContext->translate(-filterRect.x(), -filterRect.y());
sourceGraphicsContext->clearRect(filterRect);
return sourceGraphicsContext;
}