--- /dev/null
+/*
+ * Acess2 Kernel
+ * - By John Hodge (thePowersGang)
+ *
+ * drv/vterm_font.c
+ * - Virtual Terminal - Font rendering code
+ */
+#include "vterm.h"
+#include <api_drv_terminal.h>
+
+// ---
+// Font Render
+// ---
+#define MONOSPACE_FONT 10816
+
+#if MONOSPACE_FONT == 10808 // 8x8
+# include "vterm_font_8x8.h"
+#elif MONOSPACE_FONT == 10816 // 8x16
+# include "vterm_font_8x16.h"
+#endif
+
+// === PROTOTYPES ===
+Uint8 *VT_Font_GetChar(Uint32 Codepoint);
+
+// === GLOBALS ===
+int giVT_CharWidth = FONT_WIDTH;
+int giVT_CharHeight = FONT_HEIGHT;
+
+// === CODE ===
+/**
+ * \brief Render a font character
+ */
+void VT_Font_Render(Uint32 Codepoint, void *Buffer, int Depth, int Pitch, Uint32 BGC, Uint32 FGC)
+{
+ Uint8 *font;
+ int x, y;
+
+ // 8-bpp and below
+ if( Depth <= 8 )
+ {
+ Uint8 *buf = Buffer;
+
+ font = VT_Font_GetChar(Codepoint);
+
+ for(y = 0; y < FONT_HEIGHT; y ++)
+ {
+ for(x = 0; x < FONT_WIDTH; x ++)
+ {
+ if(*font & (1 << (FONT_WIDTH-x-1)))
+ buf[x] = FGC;
+ else
+ buf[x] = BGC;
+ }
+ buf = (void*)( (tVAddr)buf + Pitch );
+ font ++;
+ }
+ }
+ // 16-bpp and below
+ else if( Depth <= 16 )
+ {
+ Uint16 *buf = Buffer;
+
+ font = VT_Font_GetChar(Codepoint);
+
+ for(y = 0; y < FONT_HEIGHT; y ++)
+ {
+ for(x = 0; x < FONT_WIDTH; x ++)
+ {
+ if(*font & (1 << (FONT_WIDTH-x-1)))
+ buf[x] = FGC;
+ else
+ buf[x] = BGC;
+ }
+ buf = (void*)( (tVAddr)buf + Pitch );
+ font ++;
+ }
+ }
+ // 24-bpp colour
+ // - Special handling to not overwrite the next pixel
+ //TODO: Endian issues here
+ else if( Depth == 24 )
+ {
+ Uint8 *buf = Buffer;
+ Uint8 bg_r = (BGC >> 16) & 0xFF;
+ Uint8 bg_g = (BGC >> 8) & 0xFF;
+ Uint8 bg_b = (BGC >> 0) & 0xFF;
+ Uint8 fg_r = (FGC >> 16) & 0xFF;
+ Uint8 fg_g = (FGC >> 8) & 0xFF;
+ Uint8 fg_b = (FGC >> 0) & 0xFF;
+
+ font = VT_Font_GetChar(Codepoint);
+
+ for(y = 0; y < FONT_HEIGHT; y ++)
+ {
+ for(x = 0; x < FONT_WIDTH; x ++)
+ {
+ Uint8 r, g, b;
+
+ if(*font & (1 << (FONT_WIDTH-x-1))) {
+ r = fg_r; g = fg_g; b = fg_b;
+ }
+ else {
+ r = bg_r; g = bg_g; b = bg_b;
+ }
+ buf[x*3+0] = b;
+ buf[x*3+1] = g;
+ buf[x*3+2] = r;
+ }
+ buf = (void*)( (tVAddr)buf + Pitch );
+ font ++;
+ }
+ }
+ // 32-bpp colour (nice and easy)
+ else if( Depth == 32 )
+ {
+ Uint32 *buf = Buffer;
+
+ font = VT_Font_GetChar(Codepoint);
+
+ for(y = 0; y < FONT_HEIGHT; y ++)
+ {
+ for(x = 0; x < FONT_WIDTH; x ++)
+ {
+ if(*font & (1 << (FONT_WIDTH-x-1)))
+ buf[x] = FGC;
+ else
+ buf[x] = BGC;
+ }
+ buf = (Uint32*)( (tVAddr)buf + Pitch );
+ font ++;
+ }
+ }
+}
+
+/**
+ * \fn Uint32 VT_Colour12to24(Uint16 Col12)
+ * \brief Converts a 12-bit colour into 24 bits
+ */
+Uint32 VT_Colour12to24(Uint16 Col12)
+{
+ Uint32 ret;
+ int tmp;
+ tmp = Col12 & 0xF;
+ ret = (tmp << 0) | (tmp << 4);
+ tmp = (Col12 & 0xF0) >> 4;
+ ret |= (tmp << 8) | (tmp << 12);
+ tmp = (Col12 & 0xF00) >> 8;
+ ret |= (tmp << 16) | (tmp << 20);
+ return ret;
+}
+/**
+ * \brief Converts a 12-bit colour into 15 bits
+ */
+Uint16 VT_Colour12to15(Uint16 Col12)
+{
+ Uint32 ret;
+ int tmp;
+ tmp = Col12 & 0xF;
+ ret = (tmp << 1) | (tmp & 1);
+ tmp = (Col12 & 0xF0) >> 4;
+ ret |= ( (tmp << 1) | (tmp & 1) ) << 5;
+ tmp = (Col12 & 0xF00) >> 8;
+ ret |= ( (tmp << 1) | (tmp & 1) ) << 10;
+ return ret;
+}
+
+/**
+ * \brief Converts a 12-bit colour into any other depth
+ * \param Col12 12-bit source colour
+ * \param Depth Desired bit deptj
+ * \note Green then blue get the extra avaliable bits (16:5-6-5, 14:4-5-5)
+ */
+Uint32 VT_Colour12toN(Uint16 Col12, int Depth)
+{
+ Uint32 ret;
+ Uint32 r, g, b;
+ int rSize, gSize, bSize;
+
+ // Fast returns
+ if( Depth == 24 ) return VT_Colour12to24(Col12);
+ if( Depth == 15 ) return VT_Colour12to15(Col12);
+ // - 32 is a special case, it's usually 24-bit colour with an unused byte
+ if( Depth == 32 ) return VT_Colour12to24(Col12);
+
+ // Bounds checks
+ if( Depth < 8 ) return 0;
+ if( Depth > 32 ) return 0;
+
+ r = Col12 & 0xF;
+ g = (Col12 & 0xF0) >> 4;
+ b = (Col12 & 0xF00) >> 8;
+
+ rSize = gSize = bSize = Depth / 3;
+ if( rSize + gSize + bSize < Depth ) // Depth % 3 == 1
+ gSize ++;
+ if( rSize + gSize + bSize < Depth ) // Depth % 3 == 2
+ bSize ++;
+
+ // Expand
+ r <<= rSize - 4; g <<= gSize - 4; b <<= bSize - 4;
+ // Fill with the lowest bit
+ if( Col12 & 0x001 ) r |= (1 << (rSize - 4)) - 1;
+ if( Col12 & 0x010 ) r |= (1 << (gSize - 4)) - 1;
+ if( Col12 & 0x100 ) r |= (1 << (bSize - 4)) - 1;
+
+ // Create output
+ ret = r;
+ ret |= g << rSize;
+ ret |= b << (rSize + gSize);
+
+ return ret;
+}
+
+/**
+ * \fn Uint8 *VT_Font_GetChar(Uint32 Codepoint)
+ * \brief Gets an index into the font array given a Unicode Codepoint
+ * \note See http://en.wikipedia.org/wiki/CP437
+ */
+Uint8 *VT_Font_GetChar(Uint32 Codepoint)
+{
+ int index = 0;
+ if(Codepoint < 128)
+ return &VTermFont[Codepoint*FONT_HEIGHT];
+ switch(Codepoint)
+ {
+ case 0xC7: index = 128; break; // Ç
+ case 0xFC: index = 129; break; // ü
+ case 0xE9: index = 130; break; // é
+ case 0xE2: index = 131; break; // â
+ case 0xE4: index = 132; break; // ä
+ case 0xE0: index = 133; break; // à
+ case 0xE5: index = 134; break; // å
+ case 0xE7: index = 135; break; // ç
+ case 0xEA: index = 136; break; // ê
+ case 0xEB: index = 137; break; // ë
+ case 0xE8: index = 138; break; // è
+ case 0xEF: index = 139; break; // ï
+ case 0xEE: index = 140; break; // î
+ case 0xEC: index = 141; break; // ì
+ case 0xC4: index = 142; break; // Ä
+ case 0xC5: index = 143; break; // Å
+ }
+
+ return &VTermFont[index*FONT_HEIGHT];
+}
+
+EXPORTAS(&giVT_CharWidth, giVT_CharWidth);
+EXPORTAS(&giVT_CharHeight, giVT_CharHeight);
+EXPORT(VT_Font_Render);
+EXPORT(VT_Colour12to24);
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