Upsilon/poincare/src/layout/nth_root_layout.cpp

#include <string.h>
#include <assert.h>
#include "nth_root_layout.h"

const uint8_t radixPixel[NthRootLayout::k_leftRadixHeight][NthRootLayout::k_leftRadixWidth] = {
  {0x00, 0xFF, 0xFF, 0xFF, 0xFF},
  {0xFF, 0x00, 0xFF, 0xFF, 0xFF},
  {0xFF, 0x00, 0xFF, 0xFF, 0xFF},
  {0xFF, 0xFF, 0x00, 0xFF, 0xFF},
  {0xFF, 0xFF, 0x00, 0xFF, 0xFF},
  {0xFF, 0xFF, 0xFF, 0x00, 0xFF},
  {0xFF, 0xFF, 0xFF, 0x00, 0xFF},
  {0xFF, 0xFF, 0xFF, 0xFF, 0x00},
};

NthRootLayout::NthRootLayout(ExpressionLayout * radicandLayout, ExpressionLayout * indexLayout) :
  ExpressionLayout(),
  m_radicandLayout(radicandLayout),
  m_indexLayout(indexLayout)
{
  m_radicandLayout->setParent(this);
  if (m_indexLayout != nullptr) {
    m_indexLayout->setParent(this);
    m_baseline = max(m_radicandLayout->baseline() + k_radixLineThickness + k_heightMargin,
      m_indexLayout->size().height() + k_indexHeight);
  } else {
    m_baseline = m_radicandLayout->baseline() + k_radixLineThickness + k_heightMargin;
  }
}

NthRootLayout::~NthRootLayout() {
  delete m_radicandLayout;
  if (m_indexLayout != nullptr) {
    delete m_indexLayout;
  }
}

void NthRootLayout::render(KDContext * ctx, KDPoint p, KDColor expressionColor, KDColor backgroundColor) {
  KDSize radicandSize = m_radicandLayout->size();
  KDSize indexSize = m_indexLayout != nullptr ? m_indexLayout->size() : KDSize(k_leftRadixWidth,0);
  KDColor workingBuffer[k_leftRadixWidth*k_leftRadixHeight];
  KDRect leftRadixFrame(p.x() + indexSize.width() + k_widthMargin - k_leftRadixWidth,
    p.y() + m_baseline + radicandSize.height() - m_radicandLayout->baseline() + k_heightMargin - k_leftRadixHeight,
    k_leftRadixWidth, k_leftRadixHeight);
  ctx->blendRectWithMask(leftRadixFrame, expressionColor, (const uint8_t *)radixPixel, (KDColor *)workingBuffer);
  if (indexSize.height() + k_indexHeight > m_radicandLayout->baseline() + k_radixLineThickness + k_heightMargin) {
    ctx->fillRect(KDRect(p.x() + indexSize.width() + k_widthMargin,
                         p.y() + indexSize.height() + k_indexHeight - m_radicandLayout->baseline() - k_radixLineThickness - k_heightMargin,
                         k_radixLineThickness,
                         radicandSize.height() + 2*k_heightMargin + k_radixLineThickness), expressionColor);
    ctx->fillRect(KDRect(p.x() + indexSize.width() + k_widthMargin,
                         p.y() + indexSize.height() + k_indexHeight - m_radicandLayout->baseline() - k_radixLineThickness - k_heightMargin,
                         radicandSize.width() + 2*k_widthMargin,
                         k_radixLineThickness), expressionColor);
    ctx->fillRect(KDRect(p.x() + indexSize.width() + k_widthMargin + radicandSize.width() + 2*k_widthMargin,
                         p.y() + indexSize.height() + k_indexHeight - m_radicandLayout->baseline() - k_radixLineThickness - k_heightMargin,
                         k_radixLineThickness,
                         k_rightRadixHeight + k_radixLineThickness), expressionColor);
  } else {
    ctx->fillRect(KDRect(p.x() + indexSize.width() + k_widthMargin,
                         p.y(),
                         k_radixLineThickness,
                         radicandSize.height() + 2*k_heightMargin + k_radixLineThickness), expressionColor);
    ctx->fillRect(KDRect(p.x() + indexSize.width() + k_widthMargin,
                         p.y(),
                         radicandSize.width() + 2*k_widthMargin,
                         k_radixLineThickness), expressionColor);
    ctx->fillRect(KDRect(p.x() + indexSize.width() + k_widthMargin + radicandSize.width() + 2*k_widthMargin,
                         p.y(),
                         k_radixLineThickness,
                         k_rightRadixHeight + k_radixLineThickness), expressionColor);
  }

}

KDSize NthRootLayout::computeSize() {
  KDSize radicandSize = m_radicandLayout->size();
  KDSize indexSize = m_indexLayout != nullptr ? m_indexLayout->size() : KDSize(k_leftRadixWidth,0);
  return KDSize(
      indexSize.width() + 3*k_widthMargin + 2*k_radixLineThickness + radicandSize.width(),
      m_baseline + radicandSize.height() - m_radicandLayout->baseline() + k_heightMargin
      );
}

ExpressionLayout * NthRootLayout::child(uint16_t index) {
  switch (index) {
    case 0:
      return m_radicandLayout;
    case 1:
      return m_indexLayout;
    default:
      return nullptr;
  }
}

KDPoint NthRootLayout::positionOfChild(ExpressionLayout * child) {
  KDCoordinate x = 0;
  KDCoordinate y = 0;
  KDSize indexSize = m_indexLayout != nullptr ? m_indexLayout->size() : KDSize(k_leftRadixWidth,0);
  if (child == m_indexLayout) {
    x = 0;
    y = m_baseline - indexSize.height() -  k_indexHeight;
  } else if (child == m_radicandLayout) {
    x = indexSize.width() + 2*k_widthMargin + k_radixLineThickness;
    y = m_baseline - m_radicandLayout->baseline();
  } else {
    assert(false);
  }
  return KDPoint(x,y);
}