From 68dc012b32eb79ed8ebac730484d69c473306f7f Mon Sep 17 00:00:00 2001
From: KitsuneAlex <alexh@karmakrafts.dev>
Date: Tue, 14 May 2024 01:58:08 +0200
Subject: [PATCH] Add msdf_shape_remove_contour and msdf_contour_remove_edge
 functions

---
 core/msdfgen-c.cpp | 44 ++++++++++++++++++++++++++++++++++++++++++++
 msdfgen-c.h        | 16 ++++++++++++++++
 2 files changed, 60 insertions(+)

diff --git a/core/msdfgen-c.cpp b/core/msdfgen-c.cpp
index 38e2ed9..e308f3b 100644
--- a/core/msdfgen-c.cpp
+++ b/core/msdfgen-c.cpp
@@ -176,6 +176,28 @@ MSDF_API int msdf_shape_add_contour(msdf_shape_handle shape, msdf_contour_const_
     return MSDF_SUCCESS;
 }
 
+MSDF_API int msdf_shape_remove_contour(msdf_shape_handle shape, msdf_contour_const_handle contour) {
+    if(shape == nullptr || contour == nullptr) {
+        return MSDF_ERR_INVALID_ARG;
+    }
+    auto& contours = reinterpret_cast<msdfgen::Shape*>(shape)->contours;//NOLINT
+    ptrdiff_t index = 0;
+    bool found = false;
+    for(const auto& contour_ref : contours) {
+        if(&contour_ref != reinterpret_cast<const msdfgen::Contour*>(contour)) {
+            ++index;
+            continue;
+        }
+        found = true;
+        break;
+    }
+    if(!found) {
+        return MSDF_ERR_INVALID_ARG;
+    }
+    contours.erase(contours.cbegin() + index);
+    return MSDF_SUCCESS;
+}
+
 MSDF_API int msdf_shape_get_contour_count(msdf_shape_const_handle shape, size_t* contour_count) {
     if(shape == nullptr || contour_count == nullptr) {
         return MSDF_ERR_INVALID_ARG;
@@ -298,6 +320,28 @@ MSDF_API int msdf_contour_add_edge(msdf_contour_handle contour, msdf_segment_han
     return MSDF_SUCCESS;
 }
 
+MSDF_API int msdf_contour_remove_edge(msdf_contour_handle contour, msdf_segment_handle segment) {
+    if(contour == nullptr || segment == nullptr) {
+        return MSDF_ERR_INVALID_ARG;
+    }
+    auto& edges = reinterpret_cast<msdfgen::Contour*>(contour)->edges;
+    ptrdiff_t index = 0;
+    bool found = false;
+    for(const msdfgen::EdgeSegment* edge : edges) {
+        if(edge != reinterpret_cast<const msdfgen::EdgeSegment*>(segment)) {
+            ++index;
+            continue;
+        }
+        found = true;
+        break;
+    }
+    if(!found) {
+        return MSDF_ERR_INVALID_ARG;
+    }
+    edges.erase(edges.cbegin() + index);
+    return MSDF_SUCCESS;
+}
+
 MSDF_API int msdf_contour_get_edge_count(msdf_contour_const_handle contour, size_t* edge_count) {
     if(contour == nullptr || edge_count == nullptr) {
         return MSDF_ERR_INVALID_ARG;
diff --git a/msdfgen-c.h b/msdfgen-c.h
index e896e47..f7b37b5 100644
--- a/msdfgen-c.h
+++ b/msdfgen-c.h
@@ -197,6 +197,14 @@ MSDF_API int msdf_shape_get_bounds(msdf_shape_const_handle shape, msdf_bounds_t*
  */
 MSDF_API int msdf_shape_add_contour(msdf_shape_handle shape, msdf_contour_const_handle contour);
 
+/**
+ * Removes the given contour from the given shape if present.
+ * @param shape A pointer to a shape object to remove the given contour from.
+ * @param contour A pointer to the contour to remove from the shape.
+ * @returns @code MSDF_SUCCESS@endcode on success, otherwise one of the constants prefixed with @code MSDF_ERR_@endcode.
+ */
+MSDF_API int msdf_shape_remove_contour(msdf_shape_handle shape, msdf_contour_const_handle contour);
+
 /**
  * Retrieves the number of contours allocated within the given shape object.
  * @param shape A pointer to a shape object from which to retrieve the contour count.
@@ -325,6 +333,14 @@ MSDF_API int msdf_contour_alloc(msdf_contour_handle* contour);
  */
 MSDF_API int msdf_contour_add_edge(msdf_contour_handle contour, msdf_segment_handle segment);
 
+/**
+ * Removes the given edge from the given contour if present.
+ * @param contour A pointer to the contour to remove the given edge (segment) from.
+ * @param segment A pointer to the segment to remove from the given contour.
+ * @returns @code MSDF_SUCCESS@endcode on success, otherwise one of the constants prefixed with @code MSDF_ERR_@endcode.
+ */
+MSDF_API int msdf_contour_remove_edge(msdf_contour_handle contour, msdf_segment_handle segment);
+
 /**
  * Retrieves the edge count of the given contour.
  * @param contour A pointer to the contour to retrieve the edge count from.