From 1336d7fb7cb27c456dfc837c4b52a4005e75c452 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89milie=20Feral?= <emilie.feral@numworks.com>
Date: Sat, 14 Jan 2017 08:36:36 +0100
Subject: [PATCH] [poincare] create a sum layout

Change-Id: I73821aec47aa3693dddbea3d1e730236f24bbcb3
---
 poincare/Makefile                  |  1 +
 poincare/src/layout/sum_layout.cpp | 92 ++++++++++++++++++++++++++++++
 poincare/src/layout/sum_layout.h   | 26 +++++++++
 3 files changed, 119 insertions(+)
 create mode 100644 poincare/src/layout/sum_layout.cpp
 create mode 100644 poincare/src/layout/sum_layout.h

diff --git a/poincare/Makefile b/poincare/Makefile
index e21184261..61bbca55a 100644
--- a/poincare/Makefile
+++ b/poincare/Makefile
@@ -47,6 +47,7 @@ objs += $(addprefix poincare/src/layout/,\
   nth_root_layout.o\
   parenthesis_layout.o\
   string_layout.o\
+  sum_layout.o\
   subscript_layout.o\
 )
 
diff --git a/poincare/src/layout/sum_layout.cpp b/poincare/src/layout/sum_layout.cpp
new file mode 100644
index 000000000..21668f7ce
--- /dev/null
+++ b/poincare/src/layout/sum_layout.cpp
@@ -0,0 +1,92 @@
+#include "sum_layout.h"
+#include <string.h>
+#include <assert.h>
+
+const uint8_t symbolPixel[SumLayout::k_symbolHeight][SumLayout::k_symbolWidth] = {
+  {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
+  {0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
+  {0xFF, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
+  {0xFF, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
+  {0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
+  {0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, 0xFF},
+  {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF, 0xFF},
+  {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF},
+  {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF, 0xFF},
+  {0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, 0xFF},
+  {0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
+  {0xFF, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
+  {0xFF, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
+  {0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
+  {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
+};
+
+SumLayout::SumLayout(ExpressionLayout * lowerBoundLayout, ExpressionLayout * upperBoundLayout, ExpressionLayout * argumentLayout) :
+  ExpressionLayout(),
+  m_lowerBoundLayout(lowerBoundLayout),
+  m_upperBoundLayout(upperBoundLayout),
+  m_argumentLayout(argumentLayout)
+{
+  m_lowerBoundLayout->setParent(this);
+  m_upperBoundLayout->setParent(this);
+  m_argumentLayout->setParent(this);
+  m_baseline = max(m_upperBoundLayout->size().height()+k_boundHeightMargin+k_symbolHeight, m_argumentLayout->baseline());
+}
+
+SumLayout::~SumLayout() {
+  delete m_lowerBoundLayout;
+  delete m_upperBoundLayout;
+  delete m_argumentLayout;
+}
+
+void SumLayout::render(KDContext * ctx, KDPoint p, KDColor expressionColor, KDColor backgroundColor) {
+  KDSize upperBoundSize = m_upperBoundLayout->size();
+  KDSize lowerBoundSize = m_lowerBoundLayout->size();
+  KDColor workingBuffer[k_symbolWidth*k_symbolHeight];
+  KDRect symbolFrame(p.x() + max(max(0, (upperBoundSize.width()-k_symbolWidth)/2), (lowerBoundSize.width()-k_symbolWidth)/2),
+    p.y() + max(upperBoundSize.height()+k_boundHeightMargin, m_argumentLayout->baseline()-k_symbolHeight),
+    k_symbolWidth, k_symbolHeight);
+  ctx->blendRectWithMask(symbolFrame, expressionColor, (const uint8_t *)symbolPixel, (KDColor *)workingBuffer);
+}
+
+KDSize SumLayout::computeSize() {
+  KDSize argumentSize = m_argumentLayout->size();
+  KDSize lowerBoundSize = m_lowerBoundLayout->size();
+  KDSize upperBoundSize = m_upperBoundLayout->size();
+  return KDSize(
+    max(max(k_symbolWidth, lowerBoundSize.width()), upperBoundSize.width())+k_argumentWidthMargin+argumentSize.width(),
+    m_baseline + max(k_boundHeightMargin+lowerBoundSize.height(), argumentSize.height() - m_argumentLayout->baseline())
+  );
+}
+
+ExpressionLayout * SumLayout::child(uint16_t index) {
+  switch (index) {
+    case 0:
+      return m_upperBoundLayout;
+    case 1:
+      return m_lowerBoundLayout;
+    case 2:
+      return m_argumentLayout;
+    default:
+      return nullptr;
+  }
+}
+
+KDPoint SumLayout::positionOfChild(ExpressionLayout * child) {
+  KDSize lowerBoundSize = m_lowerBoundLayout->size();
+  KDSize upperBoundSize = m_upperBoundLayout->size();
+  KDCoordinate x = 0;
+  KDCoordinate y = 0;
+  if (child == m_lowerBoundLayout) {
+    x = max(max(0, (k_symbolWidth-lowerBoundSize.width())/2), (upperBoundSize.width()-lowerBoundSize.width())/2);
+    y = m_baseline + k_boundHeightMargin;
+  } else if (child == m_upperBoundLayout) {
+    x = max(max(0, (k_symbolWidth-upperBoundSize.width())/2), (lowerBoundSize.width()-upperBoundSize.width())/2);
+    y = m_baseline - k_symbolHeight- k_boundHeightMargin-upperBoundSize.height();
+  } else if (child == m_argumentLayout) {
+    x = max(max(k_symbolWidth, lowerBoundSize.width()), upperBoundSize.width())+k_argumentWidthMargin;
+    y = m_baseline - m_argumentLayout->baseline();
+  } else {
+    assert(false);
+  }
+  return KDPoint(x,y);
+}
diff --git a/poincare/src/layout/sum_layout.h b/poincare/src/layout/sum_layout.h
new file mode 100644
index 000000000..d1301402a
--- /dev/null
+++ b/poincare/src/layout/sum_layout.h
@@ -0,0 +1,26 @@
+#ifndef POINCARE_SUM_LAYOUT_H
+#define POINCARE_SUM_LAYOUT_H
+
+#include <poincare/expression.h>
+#include <poincare/expression_layout.h>
+
+class SumLayout : public ExpressionLayout {
+public:
+  SumLayout(ExpressionLayout * lowerBoundLayout, ExpressionLayout * upperBoundLayout, ExpressionLayout * argumentLayout);
+  ~SumLayout();
+  constexpr static KDCoordinate k_symbolHeight = 15;
+  constexpr static KDCoordinate k_symbolWidth = 9;
+protected:
+  void render(KDContext * ctx, KDPoint p, KDColor expressionColor, KDColor backgroundColor) override;
+  KDSize computeSize() override;
+  ExpressionLayout * child(uint16_t index) override;
+  KDPoint positionOfChild(ExpressionLayout * child) override;
+private:
+  constexpr static KDCoordinate k_boundHeightMargin = 2;
+  constexpr static KDCoordinate k_argumentWidthMargin = 2;
+  ExpressionLayout * m_lowerBoundLayout;
+  ExpressionLayout * m_upperBoundLayout;
+  ExpressionLayout * m_argumentLayout;
+};
+
+#endif