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-rw-r--r--gfx/layers/UpdateImageHelper.h82
1 files changed, 82 insertions, 0 deletions
diff --git a/gfx/layers/UpdateImageHelper.h b/gfx/layers/UpdateImageHelper.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GFX_UPDATEIMAGEHELPER_H
+#define GFX_UPDATEIMAGEHELPER_H
+
+#include "mozilla/layers/CompositorTypes.h"
+#include "mozilla/layers/ImageClient.h"
+#include "mozilla/layers/TextureClient.h"
+#include "mozilla/layers/TextureClientRecycleAllocator.h"
+#include "mozilla/layers/TextureWrapperImage.h"
+#include "mozilla/gfx/Types.h"
+
+namespace mozilla {
+namespace layers {
+
+class UpdateImageHelper {
+ public:
+ UpdateImageHelper(ImageContainer* aImageContainer, ImageClient* aImageClient,
+ gfx::IntSize aImageSize, gfx::SurfaceFormat aFormat)
+ : mImageContainer(aImageContainer),
+ mImageClient(aImageClient),
+ mImageSize(aImageSize),
+ mIsLocked(false) {
+ mTexture = mImageClient->GetTextureClientRecycler()->CreateOrRecycle(
+ aFormat, mImageSize, BackendSelector::Content, TextureFlags::DEFAULT);
+ if (!mTexture) {
+ return;
+ }
+
+ mIsLocked = mTexture->Lock(OpenMode::OPEN_WRITE_ONLY);
+ if (!mIsLocked) {
+ return;
+ }
+ }
+
+ ~UpdateImageHelper() {
+ if (mIsLocked) {
+ mTexture->Unlock();
+ mIsLocked = false;
+ }
+ }
+
+ already_AddRefed<gfx::DrawTarget> GetDrawTarget() {
+ RefPtr<gfx::DrawTarget> target;
+ if (mTexture) {
+ target = mTexture->BorrowDrawTarget();
+ }
+ return target.forget();
+ }
+
+ bool UpdateImage() {
+ if (!mTexture) {
+ return false;
+ }
+
+ if (mIsLocked) {
+ mTexture->Unlock();
+ mIsLocked = false;
+ }
+
+ RefPtr<TextureWrapperImage> image = new TextureWrapperImage(
+ mTexture, gfx::IntRect(gfx::IntPoint(0, 0), mImageSize));
+ mImageContainer->SetCurrentImageInTransaction(image);
+ return mImageClient->UpdateImage(mImageContainer);
+ }
+
+ private:
+ RefPtr<ImageContainer> mImageContainer;
+ RefPtr<ImageClient> mImageClient;
+ gfx::IntSize mImageSize;
+ RefPtr<TextureClient> mTexture;
+ bool mIsLocked;
+};
+
+} // namespace layers
+} // namespace mozilla
+
+#endif // GFX_UPDATEIMAGEHELPER_H