pr-draft-gist-ssa-authority2.md

Default Style Values from Aegisub

Source Files:

• Aegisub-master/src/ass_style.h (lines 42-65)
• Aegisub-master/src/ass_style.cpp (line 48)

Field	Default Value	ASS-Formatted Value
Name	"Default"	Default
Fontname	"Arial"	Arial
Fontsize	48.0	48
PrimaryColour	RGB(255,255,255), A=0	&H00FFFFFF (white, opaque)
SecondaryColour	RGB(255,0,0), A=0	&H000000FF (red, opaque)
OutlineColour	RGB(0,0,0), A=0	&H00000000 (black, opaque)
BackColour	RGB(0,0,0), A=0	&H00000000 (black, opaque)
Bold	false	0
Italic	false	0
Underline	false	0
StrikeOut	false	0
ScaleX	100.0	100
ScaleY	100.0	100
Spacing	0.0	0
Angle	0.0	0
BorderStyle	1	1 (normal outline+shadow)
Outline	2.0	2
Shadow	2.0	2
Alignment	2	2 (bottom-center, \an style)
MarginL	10	10
MarginR	10	10
MarginV	10	10
Encoding	1	1 (Default charset)

Relevant Code Snippets

From ass_style.h (class member default initializers):

std::string name = "Default";
std::string font = "Arial";
double fontsize = 48.;

agi::Color primary{ 255, 255, 255 };   // white
agi::Color secondary{ 255, 0, 0 };     // red (karaoke)
agi::Color outline{ 0, 0, 0 };         // black
agi::Color shadow{ 0, 0, 0 };          // black

bool bold = false;
bool italic = false;
bool underline = false;
bool strikeout = false;

double scalex = 100.;
double scaley = 100.;
double spacing = 0.;
double angle = 0.;
int borderstyle = 1;
double outline_w = 2.;
double shadow_w = 2.;
int alignment = 2;
std::array<int, 3> Margin;  // initialized in constructor
int encoding = 1;

From ass_style.cpp (constructor initializes margins):

AssStyle::AssStyle() {
    std::fill(Margin.begin(), Margin.end(), 10);
    UpdateData();
}

Complete Default Style Line

When serialized (from UpdateData() in ass_style.cpp line 181-191), the default style produces:

Style: Default,Arial,48,&H00FFFFFF,&H000000FF,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,2,2,2,10,10,10,1

Notes

1. Color format: ASS uses &HAABBGGRR format (alpha, blue, green, red). Alpha 00 means fully opaque, Alpha FF means fully transparent.
2. Boolean fields: When written to file, false becomes 0 and true becomes -1 (see line 187-188: (bold? -1 : 0)).
3. Encoding: Value 1 corresponds to the "Default" charset (see GetEncodings() function at line 198).