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freetype: add a wrapper for outline functions

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This commit is contained in:
Ali Chraghi 2022-05-26 03:08:36 +04:30 • committed by Stephen Gutekanst
parent 18369e8c9b
commit b92770404f
2 changed files with 102 additions and 20 deletions
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28
freetype/examples/glyph-to-svg.zig
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@ -53,7 +53,7 @@ const OutlinePrinter = struct {
pub fn extractOutline(self: *Self) !void {
try self.path_stream.writer().writeAll("<path d='");
var callbacks = freetype.C.FT_Outline_Funcs{
var callbacks = freetype.Outline.OutlineFuncs(*Self){
.move_to = moveToFunction,
.line_to = lineToFunction,
.conic_to = conicToFunction,
@ -61,7 +61,7 @@ const OutlinePrinter = struct {
.shift = 0,
.delta = 0,
};
try self.face.glyph.outline().?.decompose(self, &callbacks);
try self.face.glyph.outline().?.decompose(self, callbacks);
try self.path_stream.writer().writeAll("' fill='#000'/>");
}
@ -83,28 +83,20 @@ const OutlinePrinter = struct {
, .{ self.xMin, self.yMin, self.width, self.height, self.path_stream.getWritten() });
}
pub fn moveToFunction(to: [*c]const freetype.Vector, self_ptr: ?*anyopaque) callconv(.C) c_int {
var self = @ptrCast(*Self, @alignCast(std.meta.alignment(Self), self_ptr));
self.path_stream.writer().print("M {d} {d}\t", .{ to.*.x, to.*.y }) catch unreachable;
return 0;
pub fn moveToFunction(self: *Self, to: freetype.Vector) freetype.Error!void {
self.path_stream.writer().print("M {d} {d}\t", .{ to.x, to.y }) catch unreachable;
}
pub fn lineToFunction(to: [*c]const freetype.Vector, self_ptr: ?*anyopaque) callconv(.C) c_int {
var self = @ptrCast(*Self, @alignCast(std.meta.alignment(Self), self_ptr));
self.path_stream.writer().print("L {d} {d}\t", .{ to.*.x, to.*.y }) catch unreachable;
return 0;
pub fn lineToFunction(self: *Self, to: freetype.Vector) freetype.Error!void {
self.path_stream.writer().print("L {d} {d}\t", .{ to.x, to.y }) catch unreachable;
}
pub fn conicToFunction(control: [*c]const freetype.Vector, to: [*c]const freetype.Vector, self_ptr: ?*anyopaque) callconv(.C) c_int {
var self = @ptrCast(*Self, @alignCast(std.meta.alignment(Self), self_ptr));
self.path_stream.writer().print("Q {d} {d}, {d} {d}\t", .{ control.*.x, control.*.y, to.*.x, to.*.y }) catch unreachable;
return 0;
pub fn conicToFunction(self: *Self, control: freetype.Vector, to: freetype.Vector) freetype.Error!void {
self.path_stream.writer().print("Q {d} {d}, {d} {d}\t", .{ control.x, control.y, to.x, to.y }) catch unreachable;
}
pub fn cubicToFunction(control_0: [*c]const freetype.Vector, control_1: [*c]const freetype.Vector, to: [*c]const freetype.Vector, self_ptr: ?*anyopaque) callconv(.C) c_int {
var self = @ptrCast(*Self, @alignCast(std.meta.alignment(Self), self_ptr));
self.path_stream.writer().print("C {d} {d}, {d} {d}, {d} {d}\t", .{ control_0.*.x, control_0.*.y, control_1.*.x, control_1.*.y, to.*.x, to.*.y }) catch unreachable;
return 0;
pub fn cubicToFunction(self: *Self, control_0: freetype.Vector, control_1: freetype.Vector, to: freetype.Vector) freetype.Error!void {
self.path_stream.writer().print("C {d} {d}, {d} {d}, {d} {d}\t", .{ control_0.x, control_0.y, control_1.x, control_1.y, to.x, to.y }) catch unreachable;
}
pub fn run(self: *Self, symbol: u8) !void {