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[renderer] Return count of lines printed to char buffer

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This allows users to know the number of terminated lines in the printed
text without having to redundantly count the lines.
This commit is contained in:
Bill Currie 2022-09-20 10:27:24 +09:00
parent 3eceb444d3
commit 474f01d321
2 changed files with 11 additions and 6 deletions
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2
include/QF/draw.h
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@ -59,7 +59,7 @@ void Draw_DestroyBuffer (draw_charbuffer_t *buffer);
void Draw_ClearBuffer (draw_charbuffer_t *buffer);
void Draw_ScrollBuffer (draw_charbuffer_t *buffer, int lines);
void Draw_CharBuffer (int x, int y, draw_charbuffer_t *buffer);
void Draw_PrintBuffer (draw_charbuffer_t *buffer, const char *str);
int Draw_PrintBuffer (draw_charbuffer_t *buffer, const char *str);
extern byte *draw_chars;

15
libs/video/renderer/r_draw.c
View file

@ -91,12 +91,13 @@ Draw_CharBuffer (int x, int y, draw_charbuffer_t *buffer)
#define TAB 8
VISIBLE void
VISIBLE int
Draw_PrintBuffer (draw_charbuffer_t *buffer, const char *str)
{
char *dst = buffer->chars;
char c;
int tab;
int lines = 0;
dst += buffer->cursy * buffer->width + buffer->cursx;
while ((c = *str++)) {
switch (c) {
@ -109,10 +110,12 @@ Draw_PrintBuffer (draw_charbuffer_t *buffer, const char *str)
buffer->cursx = 0;
dst += buffer->width;
buffer->cursy++;
lines++;
break;
case '\f':
dst += buffer->width;
buffer->cursy++;
lines++;
break;
case '\t':
tab = TAB - buffer->cursx % TAB;
@ -127,12 +130,14 @@ Draw_PrintBuffer (draw_charbuffer_t *buffer, const char *str)
if (buffer->cursx >= buffer->width) {
buffer->cursx -= buffer->width;
buffer->cursy++;
lines++;
}
if (buffer->cursy >= buffer->height) {
int lines = buffer->cursy - buffer->height + 1;
Draw_ScrollBuffer (buffer, lines);
dst -= lines * buffer->width;
buffer->cursy -= lines;
int excess = buffer->cursy - buffer->height + 1;
Draw_ScrollBuffer (buffer, excess);
dst -= excess * buffer->width;
buffer->cursy -= excess;
}
}
return lines;
}