ui/src/plugins/dev.perfetto.VideoFrames/video_frames.scss

// Copyright (C) 2026 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Base preview canvas. max-width keeps it within its container; the shell
// rules below bound the height in the details panel.
.pf-video-frame-preview {
  display: block;
  max-width: 100%;
  border: 1px solid var(--pf-color-border);
  border-radius: 4px;
}

// Hover-preview shown in the track tooltip, same UX as the Screenshots
// track's thumbnail: just the decoded frame sized to itself and capped,
// with no wrapper box -- so there is no letterbox / white padding around
// the image. A smaller cap keeps the preview compact so it minimises how
// far it extends over the ruler above the (short) slice track row.
.pf-video-frame-tooltip__img {
  display: block;
  max-width: 180px;
  max-height: 180px;
}

// Layout scoping for the VideoFrame details panel. DetailsShell
// (fillHeight) already gives a fixed-height, non-scrolling shell with a
// flex-column body; these rules make the height chain down to the preview
// canvas *definite* so the canvas is bounded to the available height
// (never scrolls) and rescales to fit -- preserving aspect ratio via
// object-fit -- as the panel is resized.
.pf-video-frame-shell {
  // The panel body never scrolls; the preview rescales to fit instead.
  .pf-content {
    overflow: hidden;
  }

  // Fill the body and shrink below intrinsic content height (the standard
  // flex/grid min-height:0 fix). box-sizing + the default 8px grid margin
  // would otherwise push total content 16px past the box and re-introduce
  // a scrollbar, so the grid fills the content box exactly: height 100%
  // minus its own vertical margins. stretch gives each column the full row
  // height, so the preview column has a definite height to scale into.
  .pf-grid-layout {
    box-sizing: border-box;
    height: calc(100% - 16px);
    min-height: 0;
    align-items: stretch;
  }

  // Only the preview section fills + centers; the details (table) section
  // keeps its natural height.
  .pf-video-frame-preview-section {
    display: flex;
    flex-direction: column;
    min-height: 0;

    article {
      flex: 1;
      min-height: 0;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    // Within the bounded section, fill the box and letterbox the decoded
    // frame to preserve aspect ratio. The canvas *buffer* stays native
    // resolution (set in drawFrame); this only controls displayed size.
    .pf-video-frame-preview {
      width: 100%;
      height: 100%;
      max-width: 100%;
      object-fit: contain;
    }
  }
}