87 lines
3.9 KiB
C++
Executable File
87 lines
3.9 KiB
C++
Executable File
/*
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* Copyright (C) 2018 The Android Open Source Project
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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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*/
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#ifndef IMAGE_IMAGEOPS_H
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#define IMAGE_IMAGEOPS_H
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#include <image/LinearImage.h>
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#include <cstddef>
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#include <initializer_list>
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namespace image {
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// Concatenates images horizontally to create a filmstrip atlas, similar to numpy's hstack.
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LinearImage horizontalStack(std::initializer_list<LinearImage> images);
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LinearImage horizontalStack(LinearImage const* img, size_t count);
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// Concatenates images vertically to create a filmstrip atlas, similar to numpy's vstack.
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LinearImage verticalStack(std::initializer_list<LinearImage> images);
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LinearImage verticalStack(LinearImage const* img, size_t count);
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// Horizontally or vertically mirror the given image.
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LinearImage horizontalFlip(const LinearImage& image);
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LinearImage verticalFlip(const LinearImage& image);
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// Transforms normals (components live in [-1,+1]) into colors (components live in [0,+1]).
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LinearImage vectorsToColors(const LinearImage& image);
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LinearImage colorsToVectors(const LinearImage& image);
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// Creates a single-channel image by extracting the selected channel.
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LinearImage extractChannel(const LinearImage& image, uint32_t channel);
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// Constructs a multi-channel image by copying data from a sequence of single-channel images.
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LinearImage combineChannels(std::initializer_list<LinearImage> images);
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LinearImage combineChannels(LinearImage const* img, size_t count);
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// Generates a new image with rows & columns swapped.
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LinearImage transpose(const LinearImage& image);
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// Extracts pixels by specifying a crop window where (0,0) is the top-left corner of the image.
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// The boundary is specified as Left Top Right Bottom.
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LinearImage cropRegion(const LinearImage& image, uint32_t l, uint32_t t, uint32_t r, uint32_t b);
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// Lexicographically compares two images, similar to memcmp.
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int compare(const LinearImage& a, const LinearImage& b, float epsilon = 0.0f);
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// Sets all pixels in all channels to the given value.
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void clearToValue(LinearImage& img, float value);
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// Called by the coordinate field generator to query if a pixel is within the region of interest.
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using PresenceCallback = bool(*)(const LinearImage& img, uint32_t col, uint32_t row, void* user);
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// Generates a two-channel field of non-normalized coordinates that indicate the nearest pixel
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// whose presence function returns true. This is the first step before generating a distance
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// field or generalized Voronoi map.
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LinearImage computeCoordField(const LinearImage& src, PresenceCallback presence, void* user);
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// Generates a single-channel Euclidean distance field with positive values outside the region
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// of interest in the source image, and zero values inside. If sqrt is false, the computed
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// distances are squared. If signed distance (SDF) is desired, this function can be called a second
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// time using an inverted source field.
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LinearImage edtFromCoordField(const LinearImage& coordField, bool sqrt);
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// Dereferences the given coordinate field. Useful for creating Voronoi diagrams or dilated images.
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LinearImage voronoiFromCoordField(const LinearImage& coordField, const LinearImage& src);
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// Copies content of a source image into a target image. Requires width/height/channels to match.
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void blitImage(LinearImage& target, const LinearImage& source);
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} // namespace image
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#endif /* IMAGE_LINEARIMAGE_H */
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