From 510c9a95fb5f3f4a40a19ce66c95344c2013085f Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Sun, 12 Apr 2009 15:41:29 +0000
Subject: Change argument order of dmnsn_set_pixel; write C++ canvas wrapper.

---
 libdimension-png/png.c                |  8 ++++----
 libdimension/canvas.c                 |  4 ++--
 libdimension/dimension/canvas.h       |  4 ++--
 libdimensionxx/canvas.cpp             |  8 ++++++++
 libdimensionxx/dimensionxx/canvas.hpp | 22 ++++++++++++++++++++++
 tests/png.c                           |  6 +++---
 6 files changed, 41 insertions(+), 11 deletions(-)

diff --git a/libdimension-png/png.c b/libdimension-png/png.c
index 2eb6a7d..9bd22be 100644
--- a/libdimension-png/png.c
+++ b/libdimension-png/png.c
@@ -231,7 +231,7 @@ dmnsn_png_read_canvas(dmnsn_canvas **canvas, FILE *file)
           color       = dmnsn_color_from_sRGB(sRGB);
           color.trans = ((double)((png_pixel[6] << UINT16_C(8))
                                   + png_pixel[7]))/UINT16_MAX;
-          dmnsn_set_pixel(*canvas, color, x, height - y - 1);
+          dmnsn_set_pixel(*canvas, x, height - y - 1, color);
         }
       }
     } else {
@@ -247,7 +247,7 @@ dmnsn_png_read_canvas(dmnsn_canvas **canvas, FILE *file)
             /UINT16_MAX;
 
           color = dmnsn_color_from_sRGB(sRGB);
-          dmnsn_set_pixel(*canvas, color, x, height - y - 1);
+          dmnsn_set_pixel(*canvas, x, height - y - 1, color);
         }
       }
     }
@@ -264,7 +264,7 @@ dmnsn_png_read_canvas(dmnsn_canvas **canvas, FILE *file)
 
           color       = dmnsn_color_from_sRGB(sRGB);
           color.trans = ((double)png_pixel[3])/UINT8_MAX;
-          dmnsn_set_pixel(*canvas, color, x, height - y - 1);
+          dmnsn_set_pixel(*canvas, x, height - y - 1, color);
         }
       }
     } else {
@@ -277,7 +277,7 @@ dmnsn_png_read_canvas(dmnsn_canvas **canvas, FILE *file)
           sRGB.B = ((double)png_pixel[2])/UINT8_MAX;
 
           color = dmnsn_color_from_sRGB(sRGB);
-          dmnsn_set_pixel(*canvas, color, x, height - y - 1);
+          dmnsn_set_pixel(*canvas, x, height - y - 1, color);
         }
       }
     }
diff --git a/libdimension/canvas.c b/libdimension/canvas.c
index 257f1a9..49096fc 100644
--- a/libdimension/canvas.c
+++ b/libdimension/canvas.c
@@ -111,8 +111,8 @@ dmnsn_get_pixel(const dmnsn_canvas *canvas, unsigned int x, unsigned int y)
 }
 
 void
-dmnsn_set_pixel(dmnsn_canvas *canvas, dmnsn_color color,
-                unsigned int x, unsigned int y)
+dmnsn_set_pixel(dmnsn_canvas *canvas,
+                unsigned int x, unsigned int y, dmnsn_color color)
 {
   dmnsn_wrlock_pixel(canvas, x, y);
   canvas->pixels[y*canvas->x + x] = color;
diff --git a/libdimension/dimension/canvas.h b/libdimension/dimension/canvas.h
index 9a70327..4449403 100644
--- a/libdimension/dimension/canvas.h
+++ b/libdimension/dimension/canvas.h
@@ -46,8 +46,8 @@ void dmnsn_delete_canvas(dmnsn_canvas *canvas);
 /* These handle the rwlocks correctly */
 dmnsn_color dmnsn_get_pixel(const dmnsn_canvas *canvas,
                             unsigned int x, unsigned int y);
-void dmnsn_set_pixel(dmnsn_canvas *canvas, dmnsn_color color,
-                     unsigned int x, unsigned int y);
+void dmnsn_set_pixel(dmnsn_canvas *canvas,
+                     unsigned int x, unsigned int y, dmnsn_color color);
 
 /* Manual locking */
 void dmnsn_rdlock_pixel(const dmnsn_canvas *canvas,
diff --git a/libdimensionxx/canvas.cpp b/libdimensionxx/canvas.cpp
index 8b90fe9..2340066 100644
--- a/libdimensionxx/canvas.cpp
+++ b/libdimensionxx/canvas.cpp
@@ -19,3 +19,11 @@
  *************************************************************************/
 
 #include "dimensionxx.hpp"
+
+namespace Dimension
+{
+  Canvas::~Canvas()
+  {
+    dmnsn_delete_canvas(m_canvas);
+  }
+}
diff --git a/libdimensionxx/dimensionxx/canvas.hpp b/libdimensionxx/dimensionxx/canvas.hpp
index e2e493a..f51aa75 100644
--- a/libdimensionxx/dimensionxx/canvas.hpp
+++ b/libdimensionxx/dimensionxx/canvas.hpp
@@ -23,6 +23,28 @@
 
 namespace Dimension
 {
+  class Canvas
+  {
+  public:
+    Canvas(unsigned int x, unsigned int y)
+      : m_canvas(dmnsn_new_canvas(x, y)) { }
+    virtual ~Canvas();
+
+    Color pixel(unsigned int x, unsigned int y) const
+      { return Color(dmnsn_get_pixel(m_canvas, x, y)); }
+    void pixel(unsigned int x, unsigned int y, const Color& c)
+      { dmnsn_set_pixel(m_canvas, x, y, c.dmnsn()); }
+
+    dmnsn_canvas*       dmnsn()       { return m_canvas; }
+    const dmnsn_canvas* dmnsn() const { return m_canvas; }
+
+  private:
+    dmnsn_canvas* m_canvas;
+
+    // Copying prohibited
+    Canvas(const Canvas&);
+    Canvas& operator=(const Canvas&);
+  };
 }
 
 #endif /* DIMENSIONXX_CANVAS_HPP */
diff --git a/tests/png.c b/tests/png.c
index 2b3bf5b..b7edd95 100644
--- a/tests/png.c
+++ b/tests/png.c
@@ -67,7 +67,7 @@ int main() {
         color.trans = 0.5;
       }
 
-      dmnsn_set_pixel(canvas, color, i, j);
+      dmnsn_set_pixel(canvas, i, j, color);
 
       /*
        * CIE Lab colorspace
@@ -85,7 +85,7 @@ int main() {
         color.trans = 0.5;
       }
 
-      dmnsn_set_pixel(canvas, color, i + x, j);
+      dmnsn_set_pixel(canvas, i + x, j, color);
 
       /*
        * CIE Luv colorspace
@@ -103,7 +103,7 @@ int main() {
         color.trans = 0.5;
       }
 
-      dmnsn_set_pixel(canvas, color, i + 2*x, j);
+      dmnsn_set_pixel(canvas, i + 2*x, j, color);
     }
   }
 
-- 
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