| // Copyright 2014 The Cobalt Authors. All Rights Reserved. |
| // |
| // 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. |
| |
| #include "cobalt/layout/letterboxed_image.h" |
| |
| #include <cmath> |
| |
| #include "cobalt/math/point_f.h" |
| #include "cobalt/math/rect_f.h" |
| #include "cobalt/math/size_f.h" |
| |
| namespace cobalt { |
| namespace layout { |
| |
| using math::RectF; |
| using math::SizeF; |
| |
| LetterboxDimensions GetLetterboxDimensions( |
| const math::SizeF& image_size, const math::SizeF& destination_size) { |
| const float kEpsilon = 0.01f; |
| |
| LetterboxDimensions dimensions; |
| |
| if (destination_size.GetArea() == 0) { |
| DLOG(WARNING) << "destination_size " << destination_size << " is empty"; |
| return dimensions; |
| } |
| |
| if (image_size.GetArea() == 0) { |
| dimensions.fill_rects.push_back(RectF(destination_size)); |
| return dimensions; |
| } |
| |
| float image_aspect_ratio = image_size.width() / image_size.height(); |
| float destination_aspect_ratio = |
| destination_size.width() / destination_size.height(); |
| |
| if (fabsf(image_aspect_ratio - destination_aspect_ratio) < kEpsilon) { |
| // The aspect ratio of the Image are the same as the destination. |
| dimensions.image_rect = math::RectF(destination_size); |
| } else if (image_aspect_ratio > destination_aspect_ratio) { |
| // Image is wider. We have to put bands on top and bottom. |
| SizeF adjusted_size(destination_size.width(), |
| destination_size.width() / image_aspect_ratio); |
| float band_height = |
| (destination_size.height() - adjusted_size.height()) / 2; |
| |
| dimensions.image_rect = |
| math::RectF(math::PointF(0, band_height), adjusted_size); |
| dimensions.fill_rects.push_back( |
| RectF(0, 0, destination_size.width(), band_height)); |
| dimensions.fill_rects.push_back( |
| RectF(0, destination_size.height() - band_height, |
| destination_size.width(), band_height)); |
| } else { |
| // Image is higher. We have to put bands on left and right. |
| SizeF adjusted_size(destination_size.height() * image_aspect_ratio, |
| destination_size.height()); |
| float band_width = (destination_size.width() - adjusted_size.width()) / 2; |
| |
| dimensions.image_rect = |
| math::RectF(math::PointF(band_width, 0), adjusted_size); |
| dimensions.fill_rects.push_back( |
| RectF(0, 0, band_width, destination_size.height())); |
| dimensions.fill_rects.push_back(RectF(destination_size.width() - band_width, |
| 0, band_width, |
| destination_size.height())); |
| } |
| |
| return dimensions; |
| } |
| |
| } // namespace layout |
| } // namespace cobalt |