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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
View file

@ -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 {

94
freetype/src/Outline.zig
View file

@ -4,6 +4,7 @@ const types = @import("types.zig");
const Glyph = @import("Glyph.zig");
const Error = @import("error.zig").Error;
const convertError = @import("error.zig").convertError;
const errorToInt = @import("error.zig").errorToInt;
const Outline = @This();
@ -48,6 +49,95 @@ pub fn bbox(self: Outline) Error!types.BBox {
return res;
}
pub fn decompose(self: Outline, callbacks_ctx: anytype, callbacks: *c.FT_Outline_Funcs) Error!void {
try convertError(c.FT_Outline_Decompose(self.handle, callbacks, @ptrCast(?*anyopaque, callbacks_ctx)));
pub fn OutlineFuncs(comptime Context: type) type {
return struct {
move_to: fn (ctx: Context, to: types.Vector) Error!void,
line_to: fn (ctx: Context, to: types.Vector) Error!void,
conic_to: fn (ctx: Context, control: types.Vector, to: types.Vector) Error!void,
cubic_to: fn (ctx: Context, control_0: types.Vector, control_1: types.Vector, to: types.Vector) Error!void,
shift: c_int,
delta: isize,
};
}
pub fn OutlineFuncsWrapper(comptime Context: type) type {
return struct {
const Self = @This();
ctx: Context,
callbacks: OutlineFuncs(Context),
fn getSelf(ptr: ?*anyopaque) *Self {
return @ptrCast(*Self, @alignCast(@alignOf(Self), ptr));
}
fn castVec(vec: [*c]const c.FT_Vector) types.Vector {
return @intToPtr(*types.Vector, @ptrToInt(vec)).*;
}
pub fn move_to(to: [*c]const c.FT_Vector, ctx: ?*anyopaque) callconv(.C) c_int {
const self = getSelf(ctx);
return if (self.callbacks.move_to(self.ctx, castVec(to))) |_|
0
else |err|
errorToInt(err);
}
pub fn line_to(to: [*c]const c.FT_Vector, ctx: ?*anyopaque) callconv(.C) c_int {
const self = getSelf(ctx);
return if (self.callbacks.line_to(self.ctx, castVec(to))) |_|
0
else |err|
errorToInt(err);
}
pub fn conic_to(
control: [*c]const c.FT_Vector,
to: [*c]const c.FT_Vector,
ctx: ?*anyopaque,
) callconv(.C) c_int {
const self = getSelf(ctx);
return if (self.callbacks.conic_to(
self.ctx,
castVec(control),
castVec(to),
)) |_|
0
else |err|
errorToInt(err);
}
pub fn cubic_to(
control_0: [*c]const c.FT_Vector,
control_1: [*c]const c.FT_Vector,
to: [*c]const c.FT_Vector,
ctx: ?*anyopaque,
) callconv(.C) c_int {
const self = getSelf(ctx);
return if (self.callbacks.cubic_to(
self.ctx,
castVec(control_0),
castVec(control_1),
castVec(to),
)) |_|
0
else |err|
errorToInt(err);
}
};
}
pub fn decompose(self: Outline, ctx: anytype, callbacks: OutlineFuncs(@TypeOf(ctx))) Error!void {
var wrapper = OutlineFuncsWrapper(@TypeOf(ctx)){ .ctx = ctx, .callbacks = callbacks };
try convertError(c.FT_Outline_Decompose(
self.handle,
&c.FT_Outline_Funcs{
.move_to = @TypeOf(wrapper).move_to,
.line_to = @TypeOf(wrapper).line_to,
.conic_to = @TypeOf(wrapper).conic_to,
.cubic_to = @TypeOf(wrapper).cubic_to,
.shift = callbacks.shift,
.delta = callbacks.delta,
},
&wrapper,
));
}