From b82ccebd3a0cce28177b5fac046139e2de7737fa Mon Sep 17 00:00:00 2001
From: Alexey Gavrilov <rebovas@yahoo.com>
Date: Sun, 20 Aug 2023 20:12:36 +0700
Subject: Getting started with print on display + some fixes

---
 arch/x86/io/VGADisplay.cpp | 119 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 arch/x86/io/VGADisplay.cpp

(limited to 'arch/x86/io/VGADisplay.cpp')

diff --git a/arch/x86/io/VGADisplay.cpp b/arch/x86/io/VGADisplay.cpp
new file mode 100644
index 0000000..b74858b
--- /dev/null
+++ b/arch/x86/io/VGADisplay.cpp
@@ -0,0 +1,119 @@
+#include "VGADisplay.h"
+
+VGADisplay::VGADisplay()
+{
+    isBright = isBlink = shift = 0;
+    xCurr = yCurr = 0;
+    color = (char)VGADisplayInfo::colorAttr::gray;
+    videoMem = (dchar *)VGADisplayInfo::videoMemAddr;
+};
+
+VGADisplay::VGADisplay(uint16 x, uint16 y)
+{
+    isBright = isBlink = shift = 0;
+    xCurr = yCurr = 0;
+    color = (char)VGADisplayInfo::colorAttr::gray;
+    videoMem = (dchar *)VGADisplayInfo::videoMemAddr;
+};
+
+VGADisplay& VGADisplay::operator<<(const char &c)
+{
+    printChar(c);
+
+    return *this;
+};
+
+VGADisplay& VGADisplay::operator++(int)
+{
+    if(++xCurr == VGADisplayInfo::width)
+    {
+        yCurr++; 
+        xCurr = 0; 
+    }
+    if(yCurr == VGADisplayInfo::height)
+    {
+        if(shift)
+        { 
+            this->doShift(); 
+            xCurr = 0; 
+            yCurr--;
+        }
+        else xCurr = 0, yCurr = 0;
+    }
+    videoMem = (dchar *)(VGADisplayInfo::videoMemAddr) 
+                + yCurr * VGADisplayInfo::width + xCurr;
+
+    return *this;
+};
+
+VGADisplay& VGADisplay::operator<<(const char *c)
+{
+    for(int i = 0; c[i] != '\0'; i++)
+    {
+        (*this) << c[i];
+    }
+
+    return *this;
+};
+
+void VGADisplay::doShift()
+{
+    for(uint16 i = 0; i < VGADisplayInfo::height; i++)
+    {
+        for(uint16 j = 0; j < VGADisplayInfo::width; j++)
+        {
+            *((dchar *)(VGADisplayInfo::videoMemAddr) + (i - 1) * VGADisplayInfo::width + j) = *((dchar *)(VGADisplayInfo::videoMemAddr) + i * VGADisplayInfo::width + j);
+            *((dchar *)(VGADisplayInfo::videoMemAddr) + i * VGADisplayInfo::width + j) = (*((dchar *)(VGADisplayInfo::videoMemAddr) + i * VGADisplayInfo::width + j) & 0x00) | ' ';
+        }
+    }
+};
+
+void VGADisplay::setShift(bool status)
+{
+    shift = status;
+};
+
+void VGADisplay::setColor(char colorAttr)
+{
+    color = colorAttr;
+}; 
+
+void VGADisplay::setBlink(bool blinkAttr)
+{
+    isBlink = blinkAttr;
+};
+
+void VGADisplay::setBright(bool brigthAttr)
+{
+    isBright = brigthAttr;
+};
+
+void VGADisplay::goNewLine()
+{
+    uint16 yCurrOld = yCurr;
+
+    while(yCurrOld == yCurr) (*this)++;
+};
+
+void VGADisplay::goHorizontalTab()
+{
+    while(xCurr % 8 != 0) (*this)++;
+};
+
+bool VGADisplay::printChar(const char &c)
+{
+    switch(c)
+    {
+        case '\0': return true;
+        case '\n': this->goNewLine(); return true;
+        case '\t': this->goHorizontalTab(); return true;
+        default:
+                   {
+                        char attr = isBlink << 8 | isBright << 4
+                                                 | color;
+                        *videoMem = c | attr << 8; 
+                        (*this)++;
+                        return false;
+                   }
+    }
+};
-- 
cgit v1.2.3