Function gui_gdscreenshot

src/lua-engine.cpp:4144–4184

gui.gdscreenshot(getemuscreen) Returns a screen shot as a string in gd's v1 file format. This allows us to make screen shots available without gd installed locally. Users can also just grab pixels via substring selection. I think... Does lua support grabbing byte values from a string? // yes, string.byte(str,offset) Well, either way, just install gd and do what you like with it. It really is ea

//  It really is easier that way.
// example: gd.createFromGdStr(gui.gdscreenshot()):png("outputimage.png")
static int gui_gdscreenshot(lua_State *L) {
	bool getemuscreen = (lua_toboolean(L,1) == 1);

	int width = LUA_SCREEN_WIDTH;
	int height = LUA_SCREEN_HEIGHT;

	int size = 11 + width * height * 4;
	char* str = new char[size+1];
	str[size] = 0;
	unsigned char* ptr = (unsigned char*)str;

	// GD format header for truecolor image (11 bytes)
	*ptr++ = (65534 >> 8) & 0xFF;
	*ptr++ = (65534     ) & 0xFF;
	*ptr++ = (width >> 8) & 0xFF;
	*ptr++ = (width     ) & 0xFF;
	*ptr++ = (height>> 8) & 0xFF;
	*ptr++ = (height    ) & 0xFF;
	*ptr++ = 1;
	*ptr++ = 255;
	*ptr++ = 255;
	*ptr++ = 255;
	*ptr++ = 255;

	uint8* scrBuf = getemuscreen ? XBackBuf : XBuf;

	for (int y=0; y < height; y++) {
		for (int x=0; x < width; x++) {
			uint8 index = scrBuf[(y)*256 + x];

			// Write A,R,G,B (alpha=0 for us):
			*ptr = 0;
			FCEUD_GetPalette(index, ptr + 1, ptr + 2, ptr + 3);
			ptr += 4;
		}
	}

	lua_pushlstring(L, str, size);
	delete[] str;
	return 1;
}

// gui.opacity(number alphaValue)
// sets the transparency of subsequent draw calls