本文整理汇总了C++中nsRefPtr::BlitHelper方法的典型用法代码示例。如果您正苦于以下问题：C++ nsRefPtr::BlitHelper方法的具体用法？C++ nsRefPtr::BlitHelper怎么用？C++ nsRefPtr::BlitHelper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nsRefPtr的用法示例。
在下文中一共展示了nsRefPtr::BlitHelper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: scopedTex
already_AddRefed<gfx::SourceSurface>
GLImage::GetAsSourceSurface()
{
MOZ_ASSERT(NS_IsMainThread(), "Should be on the main thread");
if (!sSnapshotContext) {
sSnapshotContext = GLContextProvider::CreateHeadless(false);
if (!sSnapshotContext) {
NS_WARNING("Failed to create snapshot GLContext");
return nullptr;
}
}
sSnapshotContext->MakeCurrent();
ScopedTexture scopedTex(sSnapshotContext);
ScopedBindTexture boundTex(sSnapshotContext, scopedTex.Texture());
gfx::IntSize size = GetSize();
sSnapshotContext->fTexImage2D(LOCAL_GL_TEXTURE_2D, 0, LOCAL_GL_RGBA,
size.width, size.height, 0,
LOCAL_GL_RGBA,
LOCAL_GL_UNSIGNED_BYTE,
nullptr);
ScopedFramebufferForTexture autoFBForTex(sSnapshotContext, scopedTex.Texture());
if (!autoFBForTex.IsComplete()) {
MOZ_CRASH("ScopedFramebufferForTexture failed.");
}
const gl::OriginPos destOrigin = gl::OriginPos::TopLeft;
if (!sSnapshotContext->BlitHelper()->BlitImageToFramebuffer(this, size,
autoFBForTex.FB(),
destOrigin))
{
return nullptr;
}
RefPtr<gfx::DataSourceSurface> source =
gfx::Factory::CreateDataSourceSurface(size, gfx::SurfaceFormat::B8G8R8A8);
if (NS_WARN_IF(!source)) {
return nullptr;
}
ScopedBindFramebuffer bind(sSnapshotContext, autoFBForTex.FB());
ReadPixelsIntoDataSurface(sSnapshotContext, source);
return source.forget();
}