IFACEMETHODIMP CanvasSpriteBatch::Close()
{
return ExceptionBoundary([&]
{
auto deviceContext = m_deviceContext.Close();
if (!deviceContext)
return;
if (m_sprites.empty()) // early out if there's nothing to draw
return;
//
// Sort the sprites
//
if (m_sortMode == CanvasSpriteSortMode::Bitmap)
{
std::stable_sort(m_sprites.begin(), m_sprites.end(),
[] (auto const& a, auto const& b)
{
return a.Bitmap.Get() < b.Bitmap.Get();
});
}
//
// Build up a D2D sprite batch from our sprites
//
ComPtr<ID2D1SpriteBatch> spriteBatch;
ThrowIfFailed(deviceContext->CreateSpriteBatch(&spriteBatch));
assert(m_sprites.size() < std::numeric_limits<uint32_t>::max());
auto firstSprite = &m_sprites.front();
auto stride = static_cast<uint32_t>(sizeof(Sprite));
ThrowIfFailed(spriteBatch->AddSprites(
static_cast<uint32_t>(m_sprites.size()),
&firstSprite->DestinationRect,
&firstSprite->SourceRect,
&firstSprite->Color,
&firstSprite->Transform,
stride,
stride,
stride,
stride));
//
// Get the device context into the right state
//
auto originalAntialiasMode = deviceContext->GetAntialiasMode();
if (originalAntialiasMode == D2D1_ANTIALIAS_MODE_PER_PRIMITIVE)
deviceContext->SetAntialiasMode(D2D1_ANTIALIAS_MODE_ALIASED);
auto originalUnitMode = deviceContext->GetUnitMode();
if (originalUnitMode != m_unitMode)
deviceContext->SetUnitMode(m_unitMode);
//
// Draw the sprites - one DrawSpriteBatch call for each bitmap
//
// Figure out if we need to quirk the batch size to workaround an issue
// with older Qualcomm drivers.
ComPtr<ID2D1Device> d2dDevice;
deviceContext->GetDevice(&d2dDevice);
auto device = ResourceManager::GetOrCreate<ICanvasDeviceInternal>(d2dDevice.Get());
bool quirked = device->IsSpriteBatchQuirkRequired();
uint32_t maxSpritesPerBatch = quirked ? 256 : std::numeric_limits<uint32_t>::max();
for (BatchFinder<Sprite> batchFinder(m_sprites, maxSpritesPerBatch); !batchFinder.Done(); batchFinder.FindNext())
{
deviceContext->DrawSpriteBatch(
spriteBatch.Get(),
batchFinder.CurrentStartIndex(),
batchFinder.CurrentSpriteCount(),
batchFinder.CurrentBitmap(),
m_interpolationMode,
m_spriteOptions);
if (quirked)
{
// Direct2D will helpfully batch up our DrawSpriteBatch calls - when
// we're manually unbatching them to avoid limits of the maximum sprites per batch!
// An explicit Flush here prevents that from happening.
deviceContext->Flush();
}
}
//
// Restore the state we may have changed
//
if (originalUnitMode != m_unitMode)
deviceContext->SetUnitMode(originalUnitMode);
if (originalAntialiasMode == D2D1_ANTIALIAS_MODE_PER_PRIMITIVE)
deviceContext->SetAntialiasMode(originalAntialiasMode);
});
}
