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87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
// -*- mode:c++; tab-width:2; indent-tabs-mode:nil; c-basic-offset:2 -*-
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/*
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* LuminanceSource.cpp
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* zxing
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*
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* Copyright 2008 ZXing authors All rights reserved.
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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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#include <sstream>
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#include <zxing/LuminanceSource.h>
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#include <zxing/InvertedLuminanceSource.h>
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#include <zxing/common/IllegalArgumentException.h>
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using zxing::Ref;
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using zxing::LuminanceSource;
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LuminanceSource::LuminanceSource(int width_, int height_) :width(width_), height(height_) {}
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LuminanceSource::~LuminanceSource() {}
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bool LuminanceSource::isCropSupported() const {
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return false;
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}
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Ref<LuminanceSource> LuminanceSource::crop(int, int, int, int) const {
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throw IllegalArgumentException("This luminance source does not support cropping.");
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}
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bool LuminanceSource::isRotateSupported() const {
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return false;
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}
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Ref<LuminanceSource> LuminanceSource::rotateCounterClockwise() const {
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throw IllegalArgumentException("This luminance source does not support rotation.");
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}
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LuminanceSource::operator std::string() const {
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ArrayRef<char> row;
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std::ostringstream oss;
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for (int y = 0; y < getHeight(); y++) {
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row = getRow(y, row);
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for (int x = 0; x < getWidth(); x++) {
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int luminance = row[x] & 0xFF;
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char c;
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if (luminance < 0x40) {
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c = '#';
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} else if (luminance < 0x80) {
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c = '+';
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} else if (luminance < 0xC0) {
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c = '.';
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} else {
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c = ' ';
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}
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oss << c;
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}
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oss << '\n';
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}
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return oss.str();
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}
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Ref<LuminanceSource> LuminanceSource::invert() const {
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// N.B.: this only works because we use counted objects with the
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// count in the object. This is _not_ how things like shared_ptr
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// work. They do not allow you to make a smart pointer from a native
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// pointer more than once. If we ever switch to (something like)
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// shared_ptr's, the luminace source is going to have keep a weak
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// pointer to itself from which it can create a strong pointer as
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// needed. And, FWIW, that has nasty semantics in the face of
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// exceptions during construction.
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return Ref<LuminanceSource>
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(new InvertedLuminanceSource(Ref<LuminanceSource>(const_cast<LuminanceSource*>(this))));
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}
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