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GridSampler Trait -- changed from abstract

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Henry Schimke
2022-09-01 13:59:20 -05:00
parent 0e0cf39241
commit 10b277e09e
2 changed files with 181 additions and 174 deletions
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181
src/common/mod.rs
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@@ -2067,3 +2067,184 @@ impl BitSourceBuilder {
&self.output
}
}
/*
* Copyright 2007 ZXing authors
*
* 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.
*/
// package com.google.zxing.common;
// import com.google.zxing.NotFoundException;
/**
* Implementations of this class can, given locations of finder patterns for a QR code in an
* image, sample the right points in the image to reconstruct the QR code, accounting for
* perspective distortion. It is abstracted since it is relatively expensive and should be allowed
* to take advantage of platform-specific optimized implementations, like Sun's Java Advanced
* Imaging library, but which may not be available in other environments such as J2ME, and vice
* versa.
*
* The implementation used can be controlled by calling {@link #setGridSampler(GridSampler)}
* with an instance of a class which implements this interface.
*
* @author Sean Owen
*/
pub trait GridSampler {
// /**
// * Sets the implementation of GridSampler used by the library. One global
// * instance is stored, which may sound problematic. But, the implementation provided
// * ought to be appropriate for the entire platform, and all uses of this library
// * in the whole lifetime of the JVM. For instance, an Android activity can swap in
// * an implementation that takes advantage of native platform libraries.
// *
// * @param newGridSampler The platform-specific object to install.
// */
// public static void setGridSampler(GridSampler newGridSampler) {
// gridSampler = newGridSampler;
// }
// /**
// * @return the current implementation of GridSampler
// */
// public static GridSampler getInstance() {
// return gridSampler;
// }
/**
* Samples an image for a rectangular matrix of bits of the given dimension. The sampling
* transformation is determined by the coordinates of 4 points, in the original and transformed
* image space.
*
* @param image image to sample
* @param dimensionX width of {@link BitMatrix} to sample from image
* @param dimensionY height of {@link BitMatrix} to sample from image
* @param p1ToX point 1 preimage X
* @param p1ToY point 1 preimage Y
* @param p2ToX point 2 preimage X
* @param p2ToY point 2 preimage Y
* @param p3ToX point 3 preimage X
* @param p3ToY point 3 preimage Y
* @param p4ToX point 4 preimage X
* @param p4ToY point 4 preimage Y
* @param p1FromX point 1 image X
* @param p1FromY point 1 image Y
* @param p2FromX point 2 image X
* @param p2FromY point 2 image Y
* @param p3FromX point 3 image X
* @param p3FromY point 3 image Y
* @param p4FromX point 4 image X
* @param p4FromY point 4 image Y
* @return {@link BitMatrix} representing a grid of points sampled from the image within a region
* defined by the "from" parameters
* @throws NotFoundException if image can't be sampled, for example, if the transformation defined
* by the given points is invalid or results in sampling outside the image boundaries
*/
fn sample_grid_detailed(&self, image:&BitMatrix,
dimensionX:u32,
dimensionY:u32,
p1ToX:f32, p1ToY:f32,
p2ToX:f32, p2ToY:f32,
p3ToX:f32, p3ToY:f32,
p4ToX:f32, p4ToY:f32,
p1FromX:f32, p1FromY:f32,
p2FromX:f32, p2FromY:f32,
p3FromX:f32, p3FromY:f32,
p4FromX:f32, p4FromY:f32) -> Result<BitMatrix,Exceptions>;
fn sample_grid(&self, image:&BitMatrix,
dimensionX:u32,
dimensionY:u32,
transform:&PerspectiveTransform) -> Result<BitMatrix ,Exceptions>;
/**
* <p>Checks a set of points that have been transformed to sample points on an image against
* the image's dimensions to see if the point are even within the image.</p>
*
* <p>This method will actually "nudge" the endpoints back onto the image if they are found to be
* barely (less than 1 pixel) off the image. This accounts for imperfect detection of finder
* patterns in an image where the QR Code runs all the way to the image border.</p>
*
* <p>For efficiency, the method will check points from either end of the line until one is found
* to be within the image. Because the set of points are assumed to be linear, this is valid.</p>
*
* @param image image into which the points should map
* @param points actual points in x1,y1,...,xn,yn form
* @throws NotFoundException if an endpoint is lies outside the image boundaries
*/
fn checkAndNudgePoints(&self, image:&BitMatrix,
points:&mut [f32]) -> Result<(),Exceptions> {
let width = image.getWidth();
let height = image.getHeight();
// Check and nudge points from start until we see some that are OK:
let mut nudged = true;
let max_offset = points.len() - 1; // points.length must be even
let mut offset = 0;
while offset < max_offset && nudged {
// for (int offset = 0; offset < maxOffset && nudged; offset += 2) {
let x = points[offset] as i32;
let y = points[offset + 1] as i32;
if x < -1 || x > width.try_into().unwrap() || y < -1 || y > height.try_into().unwrap() {
return Err(Exceptions::NotFoundException("getNotFoundInstance".to_owned()));
}
nudged = false;
if x == -1 {
points[offset] = 0.0f32;
nudged = true;
} else if x == width.try_into().unwrap() {
points[offset] = width as f32 - 1f32;
nudged = true;
}
if y == -1 {
points[offset + 1] = 0.0f32;
nudged = true;
} else if (y == height.try_into().unwrap()) {
points[offset + 1] = height as f32 - 1f32;
nudged = true;
}
offset+=2;
}
// Check and nudge points from end:
nudged = true;
let mut offset = points.len()-2;
while offset >= 0 && nudged {
// for (int offset = points.length - 2; offset >= 0 && nudged; offset -= 2) {
let x = points[offset] as i32;
let y = points[offset + 1] as i32;
if x < -1 || x > width.try_into().unwrap() || y < -1 || y > height.try_into().unwrap() {
return Err(Exceptions::NotFoundException("getNotFoundInstance".to_owned()));
}
nudged = false;
if x == -1 {
points[offset] = 0.0f32;
nudged = true;
} else if (x == width.try_into().unwrap()) {
points[offset] = width as f32 - 1f32;
nudged = true;
}
if y == -1 {
points[offset + 1] = 0.0f32;
nudged = true;
} else if (y == height.try_into().unwrap()) {
points[offset + 1] = height as f32 - 1f32;
nudged = true;
}
offset+=2;
}
Ok(())
}
}