| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef FLUTTER_SKWASM_IMAGE_PRECACHE_IMPELLER_H_ |
| #define FLUTTER_SKWASM_IMAGE_PRECACHE_IMPELLER_H_ |
| |
| #include "flutter/display_list/display_list.h" |
| #include "impeller/entity/contents/content_context.h" |
| |
| namespace Skwasm { |
| |
| // Pre-populates the ContentContext texture cache with all images referenced |
| // within the given DisplayList before rendering the main frame. |
| // |
| // In wimp, picture-backed images (DlWimpImageFromPicture) are rasterized to |
| // textures via DisplayListToTexture. If rasterization occurs on-demand |
| // mid-frame during Canvas dispatch, the nested Canvas session will start and |
| // end its own render pass on the shared ContentContext. This resets the |
| // RenderTargetCache usage tracking in the middle of the outer frame, causing |
| // active intermediate render targets (e.g. for image filters and blurs) to be |
| // stomped. |
| // |
| // Pre-caching images before RenderToTarget ensures each image is rasterized in |
| // its own standalone pass prior to the outer frame pass. |
| void PrecacheImages(const flutter::DisplayList* display_list, |
| impeller::ContentContext& context); |
| |
| } // namespace Skwasm |
| |
| #endif // FLUTTER_SKWASM_IMAGE_PRECACHE_IMPELLER_H_ |
