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0.9.5 branch: port r3120 (Lua: fix gui.gdoverlay)

This commit is contained in:
gocha 2009-12-07 06:54:15 +00:00
parent cf280bbbe6
commit 4a874696b0
1 changed files with 11 additions and 6 deletions
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17
src/lua-engine.cpp
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@ -3217,15 +3217,17 @@ DEFINE_LUA_FUNCTION(gui_gdoverlay, "[x=0,y=0,]gdimage[,alphamul]")
// GD format header for truecolor image (11 bytes)
ptr++;
ptr++;
bool trueColor = (*ptr++ == 254);
if (!trueColor) {
luaL_error(L, "indexed images are not supported");
return 0;
}
int width = *ptr++ << 8;
width |= *ptr++;
int height = *ptr++ << 8;
height |= *ptr++;
ptr += 5;
u8* Dst = (u8*)curGuiData.data;
LuaContextInfo& info = GetCurrentInfo();
int alphaMul = info.transparencyModifier;
if(lua_isnumber(L, index))
@ -3234,6 +3236,7 @@ DEFINE_LUA_FUNCTION(gui_gdoverlay, "[x=0,y=0,]gdimage[,alphamul]")
return 0;
prepare_drawing();
u8* Dst = (u8*)curGuiData.data;
gui_adjust_coord(xStart,yStart);
int xMin = curGuiData.xMin;
@ -3245,14 +3248,16 @@ DEFINE_LUA_FUNCTION(gui_gdoverlay, "[x=0,y=0,]gdimage[,alphamul]")
// since there aren't that many possible opacity levels,
// do the opacity modification calculations beforehand instead of per pixel
int opacMap[256];
for(int i = 0; i < 256; i++)
for(int i = 0; i < 128; i++)
{
int opac = 255 - (i << 1); // not sure why, but gdstr seems to divide each alpha value by 2
int opac = 255 - ((i << 1) | (i & 1)); // gdAlphaMax = 127, not 255
opac = (opac * alphaMul) / 255;
if(opac < 0) opac = 0;
if(opac > 255) opac = 255;
opacMap[i] = 255 - opac;
opacMap[i] = opac;
}
for(int i = 128; i < 256; i++)
opacMap[i] = 0; // what should we do for them, actually?
Dst += yStart * strideBytes;
for(int y = yStart; y < height+yStart && y < yMax; y++, Dst += strideBytes)