41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
// Copyright 2023 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "mediapipe/util/frame_buffer/buffer_common.h"
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namespace mediapipe {
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namespace frame_buffer {
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namespace common {
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bool crop_buffer(int x0, int y0, int x1, int y1, halide_buffer_t* buffer) {
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if (x0 < 0 || x1 >= buffer->dim[0].extent) {
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return false;
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}
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if (y0 < 0 || y1 >= buffer->dim[1].extent) {
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return false;
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}
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// Move the start pointer so that it points at (x0, y0) and set the new
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// extents. Leave the strides unchanged; we simply skip over the cropped
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// image data.
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buffer->host += y0 * buffer->dim[1].stride + x0 * buffer->dim[0].stride;
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buffer->dim[0].extent = x1 - x0 + 1;
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buffer->dim[1].extent = y1 - y0 + 1;
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return true;
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}
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} // namespace common
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} // namespace frame_buffer
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} // namespace mediapipe
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