247 lines
6.7 KiB
C++
247 lines
6.7 KiB
C++
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#ifndef RASTER_EDGE_ITERATOR_HPP
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#define RASTER_EDGE_ITERATOR_HPP
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#include "raster_edge_iterator.h"
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namespace TRop
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{
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namespace borders
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{
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template <typename PixelSelector>
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RasterEdgeIterator<PixelSelector>::RasterEdgeIterator(
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const raster_typeP &rin, const selector_type &selector,
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const TPoint &pos, const TPoint &dir, int adherence)
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: m_ras(rin), m_lx_1(rin->getLx() - 1), m_ly_1(rin->getLy() - 1), m_wrap(rin->getWrap()), m_selector(selector), m_pos(pos), m_dir(dir), m_elbowColor(selector.transparent()), m_rightSide(adherence == RIGHT), m_turn(UNKNOWN)
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{
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pixels(m_leftPix, m_rightPix);
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colors(m_leftColor, m_rightColor);
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}
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//---------------------------------------------------------------------------------------------
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template <typename PixelSelector>
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void RasterEdgeIterator<PixelSelector>::setEdge(const TPoint &pos, const TPoint &dir)
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{
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m_pos = pos, m_dir = dir;
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pixels(m_leftPix, m_rightPix);
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colors(m_leftColor, m_rightColor);
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}
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//---------------------------------------------------------------------------------------------
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template <typename PixelSelector>
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inline void RasterEdgeIterator<PixelSelector>::pixels(
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pixel_type *&pixLeft, pixel_type *&pixRight)
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{
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pixel_type *pix = m_ras->pixels(0) + m_pos.y * m_wrap + m_pos.x;
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if (m_dir.y)
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if (m_dir.y > 0)
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pixLeft = pix - 1, pixRight = pix;
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else
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pixLeft = pix - m_wrap, pixRight = pixLeft - 1;
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else if (m_dir.x > 0)
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pixLeft = pix, pixRight = pix - m_wrap;
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else
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pixRight = pix - 1, pixLeft = pixRight - m_wrap;
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}
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//---------------------------------------------------------------------------------------------
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template <typename PixelSelector>
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inline void RasterEdgeIterator<PixelSelector>::colors(
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value_type &leftColor, value_type &rightColor)
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{
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if (m_dir.y)
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if (m_dir.y > 0) {
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if (m_pos.y > m_ly_1)
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leftColor = rightColor = m_selector.transparent();
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else {
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leftColor = (m_pos.x > 0) ? m_selector.value(*m_leftPix) : m_selector.transparent();
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rightColor = (m_pos.x <= m_lx_1) ? m_selector.value(*m_rightPix) : m_selector.transparent();
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}
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} else {
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if (m_pos.y < 1)
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leftColor = rightColor = m_selector.transparent();
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else {
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leftColor = (m_pos.x <= m_lx_1) ? m_selector.value(*m_leftPix) : m_selector.transparent();
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rightColor = (m_pos.x > 0) ? m_selector.value(*m_rightPix) : m_selector.transparent();
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}
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}
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else if (m_dir.x > 0) {
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if (m_pos.x > m_lx_1)
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leftColor = rightColor = m_selector.transparent();
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else {
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leftColor = (m_pos.y <= m_ly_1) ? m_selector.value(*m_leftPix) : m_selector.transparent();
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rightColor = (m_pos.y > 0) ? m_selector.value(*m_rightPix) : m_selector.transparent();
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}
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} else {
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if (m_pos.x < 1)
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leftColor = rightColor = m_selector.transparent();
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else {
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leftColor = (m_pos.y > 0) ? m_selector.value(*m_leftPix) : m_selector.transparent();
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rightColor = (m_pos.y <= m_ly_1) ? m_selector.value(*m_rightPix) : m_selector.transparent();
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}
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}
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}
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//---------------------------------------------------------------------------------------------
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template <typename PixelSelector>
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inline void RasterEdgeIterator<PixelSelector>::turn(const value_type &newLeftColor, const value_type &newRightColor)
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{
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if (m_rightSide) {
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if (newLeftColor == m_rightColor) {
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if (newRightColor == m_leftColor)
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turnAmbiguous(newLeftColor, newRightColor);
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else
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turnLeft();
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} else {
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if (newRightColor != m_rightColor)
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turnRight();
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else
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m_turn = STRAIGHT;
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}
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m_elbowColor = newLeftColor;
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} else {
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if (newRightColor == m_leftColor) {
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if (newLeftColor == m_rightColor)
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turnAmbiguous(newLeftColor, newRightColor);
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else
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turnRight();
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} else {
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if (newLeftColor != m_leftColor)
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turnLeft();
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else
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m_turn = STRAIGHT;
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}
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m_elbowColor = newRightColor;
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}
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pixels(m_leftPix, m_rightPix);
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}
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//---------------------------------------------------------------------------------------------
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template <typename PixelSelector>
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inline void RasterEdgeIterator<PixelSelector>::turnAmbiguous(
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const value_type &newLeftColor, const value_type &newRightColor)
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{
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pixel_type *pix = m_ras->pixels(0) + m_pos.y * m_wrap + m_pos.x;
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UCHAR count1 = 0, count2 = 0;
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value_type val;
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// Check the 4x4 neighbourhood and connect the minority color
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if (m_pos.x > 2) {
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val = m_selector.value(*(pix - 2));
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if (val == m_leftColor)
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++count1;
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else if (val == m_rightColor)
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++count2;
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val = m_selector.value(*(pix - 2 - m_wrap));
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if (val == m_leftColor)
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++count1;
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else if (val == m_rightColor)
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++count2;
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}
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if (m_pos.x < m_lx_1) {
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val = m_selector.value(*(pix + 1));
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if (val == m_leftColor)
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++count1;
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else if (val == m_rightColor)
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++count2;
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val = m_selector.value(*(pix + 1 - m_wrap));
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if (val == m_leftColor)
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++count1;
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else if (val == m_rightColor)
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++count2;
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}
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if (m_pos.y > 2) {
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int wrap2 = m_wrap << 1;
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val = m_selector.value(*(pix - wrap2));
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if (val == m_leftColor)
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++count1;
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else if (val == m_rightColor)
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++count2;
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val = m_selector.value(*(pix - wrap2 - 1));
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if (val == m_leftColor)
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++count1;
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else if (val == m_rightColor)
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++count2;
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}
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if (m_pos.y < m_ly_1) {
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val = m_selector.value(*(pix + m_wrap));
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if (val == m_leftColor)
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++count1;
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else if (val == m_rightColor)
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++count2;
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val = m_selector.value(*(pix + m_wrap - 1));
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if (val == m_leftColor)
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++count1;
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else if (val == m_rightColor)
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++count2;
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}
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// Minority connection - join the one with less count
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if (count1 < count2)
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turnRight(); // Join m_leftColor == newRightColor
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else if (count1 > count2)
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turnLeft(); // Join m_rightColor == newLeftColor
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else if (m_rightColor < m_leftColor)
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turnLeft();
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else
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turnRight();
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m_turn |= AMBIGUOUS;
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}
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//---------------------------------------------------------------------------------------------
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template <typename PixelSelector>
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RasterEdgeIterator<PixelSelector> &RasterEdgeIterator<PixelSelector>::operator++()
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{
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value_type newLeftColor = m_leftColor, newRightColor = m_rightColor;
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int pixAdd = m_dir.y * m_wrap + m_dir.x;
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if (m_rightSide) {
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do {
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m_pos.x += m_dir.x, m_pos.y += m_dir.y;
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m_leftPix += pixAdd, m_rightPix += pixAdd;
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m_leftColor = newLeftColor;
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colors(newLeftColor, newRightColor);
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} while ((newRightColor == m_rightColor) && (newLeftColor != newRightColor) &&
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m_selector.skip(m_leftColor, newLeftColor));
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} else {
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do {
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m_pos.x += m_dir.x, m_pos.y += m_dir.y;
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m_leftPix += pixAdd, m_rightPix += pixAdd;
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m_rightColor = newRightColor;
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colors(newLeftColor, newRightColor);
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} while ((newLeftColor == m_leftColor) && (newLeftColor != newRightColor) &&
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m_selector.skip(m_rightColor, newRightColor));
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}
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turn(newLeftColor, newRightColor);
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colors(m_leftColor, m_rightColor);
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return *this;
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}
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}
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} // namespace TRop::borders
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#endif // RASTER_EDGE_ITERATOR_HPP
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