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- implementation of the text mode cursor in the SDL GUI

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This commit is contained in:
Volker Ruppert 2002-02-16 20:31:35 +00:00
parent 29ba221c3e
commit b1738bed08
1 changed files with 25 additions and 3 deletions
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28
bochs/gui/sdl.cc
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@ -23,6 +23,9 @@ void we_are_here(void)
}
#endif
static unsigned prev_cursor_x=0;
static unsigned prev_cursor_y=0;
struct bitmaps {
SDL_Surface *surface;
SDL_Rect src,dst;
@ -204,13 +207,19 @@ void bx_gui_c::text_update(
char *oldText = (char *)old_text;
char *newText = (char *)new_text;
unsigned char font_row, *pfont_row;
int hchars,fontrows,fontpixels,x,y;
unsigned long x,y;
int hchars,fontrows,fontpixels;
int fgcolor_ndx;
int bgcolor_ndx;
Uint32 fgcolor;
Uint32 bgcolor;
Uint32 *buf, *buf_row, *buf_char;
Uint32 disp;
Bit8u cs_start, cs_end, cs_line, mask;
Boolean invert;
cs_start = cursor_state >> 8;
cs_end = cursor_state & 0xff;
if( sdl_screen )
{
@ -227,11 +236,15 @@ void bx_gui_c::text_update(
{
buf = buf_row;
hchars = textres_x;
x = 0;
y = 25 - rows;
do
{
// check if char needs to be updated
if( (old_text[0] != new_text[0])
|| (old_text[1] != new_text[1]) )
|| (old_text[1] != new_text[1])
|| ((y == cursor_y) && (x == cursor_x))
|| ((y == prev_cursor_y) && (x == prev_cursor_x)) )
{
// Get Foreground/Background pixel colors
@ -239,6 +252,7 @@ void bx_gui_c::text_update(
bgcolor_ndx = (new_text[1] >> 4) & 0x07;
fgcolor = palette[fgcolor_ndx];
bgcolor = palette[bgcolor_ndx];
invert = ( (y == cursor_y) && (x == cursor_x) && (cs_start < cs_end) );
// Display this one char
fontrows = fontheight;
@ -248,9 +262,14 @@ void bx_gui_c::text_update(
{
font_row = *pfont_row++;
fontpixels = fontwidth;
cs_line = (16 - fontrows);
if( (invert) && (cs_line >= cs_start) && (cs_line <= cs_end) )
mask = 0x80;
else
mask = 0x00;
do
{
if( (font_row & 0x80) == 0 )
if( (font_row & 0x80) == mask )
*buf = bgcolor;
else
*buf = fgcolor;
@ -270,6 +289,7 @@ void bx_gui_c::text_update(
// select next char in old/new text
new_text+=2;
old_text+=2;
x++;
// process one entire horizontal row
} while( --hchars );
@ -277,6 +297,8 @@ void bx_gui_c::text_update(
// go to next character row location
buf_row += disp * fontheight;
} while( --rows );
prev_cursor_x = cursor_x;
prev_cursor_y = cursor_y;
}