| // Copyright 2018 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "ash/login/ui/horizontal_image_sequence_animation_decoder.h" |
| |
| #include "ui/gfx/image/image_skia_rep.h" |
| |
| namespace ash { |
| |
| HorizontalImageSequenceAnimationDecoder:: |
| HorizontalImageSequenceAnimationDecoder(const gfx::ImageSkia& image, |
| base::TimeDelta duration, |
| int num_frames) |
| : image_(image), duration_(duration), num_frames_(num_frames) {} |
| |
| HorizontalImageSequenceAnimationDecoder:: |
| ~HorizontalImageSequenceAnimationDecoder() = default; |
| |
| AnimationFrames HorizontalImageSequenceAnimationDecoder::Decode( |
| float image_scale) { |
| SkBitmap bitmap = image_.GetRepresentation(image_scale).GetBitmap(); |
| |
| float frame_width = static_cast<float>(bitmap.width()) / num_frames_; |
| base::TimeDelta frame_duration = duration_ / num_frames_; |
| |
| AnimationFrames animation; |
| animation.reserve(num_frames_); |
| for (int i = 0; i < num_frames_; ++i) { |
| // Get the subsection of the animation strip. |
| SkBitmap frame_bitmap; |
| bitmap.extractSubset( |
| &frame_bitmap, |
| SkIRect::MakeXYWH(std::round(i * frame_width), 0, |
| std::round(frame_width), bitmap.height())); |
| |
| // Add an animation frame. |
| AnimationFrame frame; |
| frame.duration = frame_duration; |
| frame.image = gfx::ImageSkia::CreateFrom1xBitmap(frame_bitmap); |
| animation.push_back(frame); |
| } |
| |
| return animation; |
| } |
| |
| } // namespace ash |