C++ DrawTarget::MaskSurface方法代碼示例

本文整理匯總了C++中DrawTarget::MaskSurface方法的典型用法代碼示例。如果您正苦於以下問題：C++ DrawTarget::MaskSurface方法的具體用法？C++ DrawTarget::MaskSurface怎麽用？C++ DrawTarget::MaskSurface使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類DrawTarget的用法示例。

在下文中一共展示了DrawTarget::MaskSurface方法的2個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的C++代碼示例。

示例1: Point

void
gfxAlphaBoxBlur::Paint(gfxContext* aDestinationCtx)
{
    if (!mContext)
        return;

    mBlur->Blur(mData);

    mozilla::gfx::Rect* dirtyRect = mBlur->GetDirtyRect();

    DrawTarget *dest = aDestinationCtx->GetDrawTarget();
    if (!dest) {
      NS_ERROR("Blurring not supported for Thebes contexts!");
      return;
    }

    mozilla::RefPtr<SourceSurface> mask
      = dest->CreateSourceSurfaceFromData(mData,
                                          mBlur->GetSize(),
                                          mBlur->GetStride(),
                                          FORMAT_A8);
    if (!mask) {
      NS_ERROR("Failed to create mask!");
      return;
    }

    nsRefPtr<gfxPattern> thebesPat = aDestinationCtx->GetPattern();
    Pattern* pat = thebesPat->GetPattern(dest, nullptr);

    Matrix oldTransform = dest->GetTransform();
    Matrix newTransform = oldTransform;
    newTransform.Translate(mBlur->GetRect().x, mBlur->GetRect().y);

    // Avoid a semi-expensive clip operation if we can, otherwise
    // clip to the dirty rect
    if (dirtyRect) {
        dest->PushClipRect(*dirtyRect);
    }

    dest->SetTransform(newTransform);
    dest->MaskSurface(*pat, mask, Point(0, 0));
    dest->SetTransform(oldTransform);

    if (dirtyRect) {
        dest->PopClip();
    }
}

開發者ID:Gabuzo，項目名稱:mozilla-central，代碼行數:47，代碼來源:gfxBlur.cpp

示例2: DoBlur

void
gfxAlphaBoxBlur::Paint(gfxContext* aDestinationCtx)
{
  if (!mAccelerated && !mData) {
    return;
  }

  DrawTarget *dest = aDestinationCtx->GetDrawTarget();
  if (!dest) {
    NS_WARNING("Blurring not supported for Thebes contexts!");
    return;
  }

  RefPtr<gfxPattern> thebesPat = aDestinationCtx->GetPattern();
  Pattern* pat = thebesPat->GetPattern(dest, nullptr);
  if (!pat) {
    NS_WARNING("Failed to get pattern for blur!");
    return;
  }

  IntPoint topLeft;
  RefPtr<SourceSurface> mask = DoBlur(nullptr, &topLeft);
  if (!mask) {
    NS_ERROR("Failed to create mask!");
    return;
  }

  // Avoid a semi-expensive clip operation if we can, otherwise
  // clip to the dirty rect
  Rect* dirtyRect = mBlur.GetDirtyRect();
  if (dirtyRect) {
    dest->PushClipRect(*dirtyRect);
  }

  Matrix oldTransform = dest->GetTransform();
  Matrix newTransform = oldTransform;
  newTransform.PreTranslate(topLeft);
  dest->SetTransform(newTransform);

  dest->MaskSurface(*pat, mask, Point(0, 0));

  dest->SetTransform(oldTransform);

  if (dirtyRect) {
    dest->PopClip();
  }
}

開發者ID:yrliou，項目名稱:gecko-dev，代碼行數:47，代碼來源:gfxBlur.cpp

注：本文中的DrawTarget::MaskSurface方法示例由純淨天空整理自Github/MSDocs等開源代碼及文檔管理平台，相關代碼片段篩選自各路編程大神貢獻的開源項目，源碼版權歸原作者所有，傳播和使用請參考對應項目的License；未經允許，請勿轉載。