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Checks in Lua gui.text() to make sure drawing isn't attempted 

off-screen.  Should close #2692369.
This commit is contained in:
smelenchuk 2010-04-08 00:46:56 +00:00
parent b38e181aa6
commit f0c5732035
1 changed files with 16 additions and 9 deletions
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25
src/lua-engine.cpp
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@ -3503,7 +3503,7 @@ static int JoedCharWidth(uint8 ch)
return FCEUFont[FixJoedChar(ch)*8];
}
void LuaDrawTextTransWH(const char *str, int x, int y, uint32 color, uint32 backcolor)
void LuaDrawTextTransWH(const char *str, size_t l, int x, int y, uint32 color, uint32 backcolor)
{
int Opac = (color >> 24) & 0xFF;
int backOpac = (backcolor >> 24) & 0xFF;
@ -3512,22 +3512,27 @@ void LuaDrawTextTransWH(const char *str, int x, int y, uint32 color, uint32 back
if(!Opac && !backOpac)
return;
int len = strlen(str);
size_t len = l;
int defaultAlpha = std::max(0, std::min(transparencyModifier, 255));
int diffx;
int diffy = std::max(0, std::min(7, LUA_SCREEN_HEIGHT - y));
while(*str && len && y < LUA_SCREEN_HEIGHT)
{
int c = *str++;
while (x > LUA_SCREEN_WIDTH && c != '\n') {
while (x >= LUA_SCREEN_WIDTH && c != '\n') {
c = *str;
if (c == '\0')
break;
str++;
if (!(--len))
break;
}
if(c == '\n')
{
x = origX;
y += 8;
diffy = std::max(0, std::min(7, LUA_SCREEN_HEIGHT - y));
continue;
}
else if(c == '\t') // just in case
@ -3537,10 +3542,11 @@ void LuaDrawTextTransWH(const char *str, int x, int y, uint32 color, uint32 back
continue;
}
diffx = std::max(0, std::min(7, LUA_SCREEN_WIDTH - x));
int ch = FixJoedChar(c);
int wid = JoedCharWidth(c);
int wid = std::min(diffx, JoedCharWidth(c));
for(int y2 = 0; y2 < 7; y2++)
for(int y2 = 0; y2 < diffy; y2++)
{
uint8 d = FCEUFont[ch*8 + 1+y2];
for(int x2 = 0; x2 < wid; x2++)
@ -3553,9 +3559,9 @@ void LuaDrawTextTransWH(const char *str, int x, int y, uint32 color, uint32 back
}
}
// shadows :P
for(int x2 = 0; x2 < wid; x2++)
if (diffy >= 7) for(int x2 = 0; x2 < wid; x2++)
gui_drawpixel_internal(x+x2, y+7, LUA_BUILD_PIXEL(defaultAlpha, 0, 0, 0));
if (*str == '\0' || *str == '\n') for(int y2 = 0; y2 < 7; y2++)
if (*str == '\0' || *str == '\n') for(int y2 = 0; y2 < diffy; y2++)
gui_drawpixel_internal(x+wid, y+y2, LUA_BUILD_PIXEL(defaultAlpha, 0, 0, 0));
x += wid;
@ -3573,10 +3579,11 @@ static int gui_text(lua_State *L) {
extern int font_height;
const char *msg;
int x, y;
size_t l;
x = luaL_checkinteger(L,1);
y = luaL_checkinteger(L,2);
msg = luaL_checkstring(L,3);
msg = luaL_checklstring(L,3,&l);
//if (x < 0 || x >= LUA_SCREEN_WIDTH || y < 0 || y >= (LUA_SCREEN_HEIGHT - font_height))
// luaL_error(L,"bad coordinates");
@ -3594,7 +3601,7 @@ static int gui_text(lua_State *L) {
gui_prepare();
LuaDrawTextTransWH(msg, x, y, color, bgcolor);
LuaDrawTextTransWH(msg, l, x, y, color, bgcolor);
#endif
return 0;