freetype: Implement needed Computation API

freetype/src/c.zig

@@ -6,4 +6,5 @@ pub usingnamespace @cImport({
     @cInclude("freetype/ftlcdfil.h");
     @cInclude("freetype/ftsizes.h");
     @cInclude("freetype/ftstroke.h");
+    @cInclude("freetype/fttrigon.h");
 });

freetype/src/freetype/computations.zig

@@ -0,0 +1,71 @@
+const _c = @import("c");
+const intToError = @import("error.zig").intToError;
+const Error = @import("error.zig").Error;
+
+const Vector = @import("image.zig").Vector;
+const Matrix = @import("types.zig").Matrix;
+
+pub const angel_pi = _c.FT_ANGLE_PI;
+pub const angel_2pi = _c.FT_ANGLE_2PI;
+pub const angel_pi2 = _c.FT_ANGLE_PI2;
+pub const angel_pi4 = _c.FT_ANGLE_PI4;
+
+pub fn mulDiv(a: i32, b: i32, c: i32) i32 {
+    return @intCast(i32, _c.FT_MulDiv(a, b, c));
+}
+
+pub fn mulFix(a: i32, b: i32) i32 {
+    return @intCast(i32, _c.FT_MulFix(a, b));
+}
+
+pub fn divFix(a: i32, b: i32) i32 {
+    return @intCast(i32, _c.FT_DivFix(a, b));
+}
+
+pub fn roundFix(a: i32) i32 {
+    return @intCast(i32, _c.FT_RoundFix(a));
+}
+
+pub fn ceilFix(a: i32) i32 {
+    return @intCast(i32, _c.FT_CeilFix(a));
+}
+
+pub fn floorFix(a: i32) i32 {
+    return @intCast(i32, _c.FT_FloorFix(a));
+}
+
+pub fn vectorTransform(vec: *Vector, matrix: Matrix) void {
+    _c.FT_Vector_Transform(vec, &matrix);
+}
+
+pub fn matrixMul(a: Matrix, b: *Matrix) void {
+    _c.FT_Matrix_Multiply(&a, b);
+}
+
+pub fn matrixInvert(m: *Matrix) Error!void {
+    try intToError(_c.FT_Matrix_Invert(m));
+}
+
+pub fn angleDiff(a: i32, b: i32) i32 {
+    return @intCast(i32, _c.FT_Angle_Diff(a, b));
+}
+
+pub fn vectorUnit(vec: *Vector, angle: i32) void {
+    _c.FT_Vector_Unit(vec, angle);
+}
+
+pub fn vectorRotate(vec: *Vector, angle: i32) void {
+    _c.FT_Vector_Rotate(vec, angle);
+}
+
+pub fn vectorLength(vec: *Vector) i32 {
+    return @intCast(i32, _c.FT_Vector_Length(vec));
+}
+
+pub fn vectorPolarize(vec: *Vector, length: *i32, angle: *i32) void {
+    _c.FT_Vector_Polarize(vec, &@intCast(c_long, length.*), &@intCast(c_long, angle.*));
+}
+
+pub fn vectorFromPolar(vec: *Vector, length: i32, angle: i32) void {
+    _c.FT_Vector_From_Polar(vec, length, angle);
+}

freetype/src/freetype/freetype.zig

@@ -5,6 +5,7 @@ const intToError = @import("error.zig").intToError;
 const Error = @import("error.zig").Error;
 const Generic = @import("types.zig").Generic;
 
+pub usingnamespace @import("computations.zig");
 pub const Library = @import("Library.zig");
 pub const Face = @import("Face.zig");
 pub const GlyphSlot = @import("GlyphSlot.zig");