From eeaf51ce729b8091c5048987babd2591ba83c005 Mon Sep 17 00:00:00 2001
From: Patrick Walton <pcwalton@mimiga.net>
Date: Thu, 30 May 2019 21:28:52 -0700
Subject: [PATCH] Expose line cap features to C

---
 c/include/pathfinder/pathfinder.h |  8 ++++++++
 c/src/lib.rs                      | 15 +++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/c/include/pathfinder/pathfinder.h b/c/include/pathfinder/pathfinder.h
index a879a05f..b047b87a 100644
--- a/c/include/pathfinder/pathfinder.h
+++ b/c/include/pathfinder/pathfinder.h
@@ -19,6 +19,12 @@ extern "C" {
 
 // Macros
 
+// `canvas`
+
+#define PF_LINE_CAP_BUTT    0
+#define PF_LINE_CAP_SQUARE  1
+#define PF_LINE_CAP_ROUND   2
+
 // `gl`
 
 #define PF_GL_VERSION_GL3   0
@@ -41,6 +47,7 @@ struct PFPath;
 typedef struct PFPath *PFPathRef;
 struct PFCanvasFontContext;
 typedef struct PFCanvasFontContext *PFCanvasFontContextRef;
+typedef uint8_t PFLineCap;
 
 // `geometry`
 
@@ -113,6 +120,7 @@ PFSceneRef PFCanvasCreateScene(PFCanvasRef canvas);
 void PFCanvasFillRect(PFCanvasRef canvas, const PFRectF *rect);
 void PFCanvasStrokeRect(PFCanvasRef canvas, const PFRectF *rect);
 void PFCanvasSetLineWidth(PFCanvasRef canvas, float new_line_width);
+void PFCanvasSetLineCap(PFCanvasRef canvas, PFLineCap new_line_cap);
 void PFCanvasFillPath(PFCanvasRef canvas, PFPathRef path);
 void PFCanvasStrokePath(PFCanvasRef canvas, PFPathRef path);
 PFPathRef PFPathCreate();
diff --git a/c/src/lib.rs b/c/src/lib.rs
index 5cfeedc1..4cd7ff68 100644
--- a/c/src/lib.rs
+++ b/c/src/lib.rs
@@ -15,6 +15,7 @@ use pathfinder_canvas::{CanvasFontContext, CanvasRenderingContext2D, Path2D};
 use pathfinder_geometry::basic::point::{Point2DF, Point2DI};
 use pathfinder_geometry::basic::rect::{RectF, RectI};
 use pathfinder_geometry::color::ColorF;
+use pathfinder_geometry::stroke::LineCap;
 use pathfinder_gl::{GLDevice, GLVersion};
 use pathfinder_gpu::resources::{FilesystemResourceLoader, ResourceLoader};
 use pathfinder_gpu::{ClearParams, Device};
@@ -29,6 +30,10 @@ use std::os::raw::{c_char, c_void};
 
 // Constants
 
+pub const PF_LINE_CAP_BUTT:   u8 = 0;
+pub const PF_LINE_CAP_SQUARE: u8 = 1;
+pub const PF_LINE_CAP_ROUND:  u8 = 2;
+
 pub const PF_CLEAR_FLAGS_HAS_COLOR:   u8 = 0x1;
 pub const PF_CLEAR_FLAGS_HAS_DEPTH:   u8 = 0x2;
 pub const PF_CLEAR_FLAGS_HAS_STENCIL: u8 = 0x4;
@@ -40,6 +45,7 @@ pub const PF_CLEAR_FLAGS_HAS_RECT:    u8 = 0x8;
 pub type PFCanvasRef = *mut CanvasRenderingContext2D;
 pub type PFPathRef = *mut Path2D;
 pub type PFCanvasFontContextRef = *mut CanvasFontContext;
+pub type PFLineCap = u8;
 
 // `geometry`
 #[repr(C)]
@@ -146,6 +152,15 @@ pub unsafe extern "C" fn PFCanvasSetLineWidth(canvas: PFCanvasRef, new_line_widt
     (*canvas).set_line_width(new_line_width)
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn PFCanvasSetLineCap(canvas: PFCanvasRef, new_line_cap: PFLineCap) {
+    (*canvas).set_line_cap(match new_line_cap {
+        PF_LINE_CAP_SQUARE => LineCap::Square,
+        PF_LINE_CAP_ROUND  => LineCap::Round,
+        _                  => LineCap::Butt,
+    });
+}
+
 /// Consumes the path.
 #[no_mangle]
 pub unsafe extern "C" fn PFCanvasFillPath(canvas: PFCanvasRef, path: PFPathRef) {