Fix canvas replace buffer bug

CREDITS

@@ -3,3 +3,4 @@
  Justin Oh          [email protected]         -----  Bug fix
  Rain               [email protected]           -----  Win32 Platform bug fix
  Mic_Zhang          [email protected]         -----  Bug fix
+ Zeronavi           [email protected]         -----  Test and bug report

src/gfx/gfx_painter.h

@@ -249,6 +249,7 @@ inline void gfx_painter<Pixfmt>::attach(abstract_rendering_buffer* buffer)
     if (buffer) {
         m_fmt.attach(*static_cast<gfx_rendering_buffer*>(buffer));
         m_rb.attach(m_fmt);
+        static_cast<gfx_rendering_buffer*>(buffer)->set_buffer_observer(&m_rb);
     }
 }
 

src/gfx/gfx_renderer.h

@@ -14,7 +14,7 @@ namespace gfx {
 
 // graphics renderer with clip.
 template <typename PixelFormat>
-class gfx_renderer
+class gfx_renderer : public gfx_rendering_buffer::gfx_buffer_observer
 {
 public:
     typedef PixelFormat pixfmt_type;
@@ -34,11 +34,17 @@ class gfx_renderer
     {
     }
 
-    ~gfx_renderer()
+    virtual ~gfx_renderer()
     {
         m_clip_path.reset();
     }
 
+    virtual void buffer_notify(void)
+    {
+		// reset clip_rect
+        m_clip_rect = rect(0, 0, m_pixfmt->width() - 1, m_pixfmt->height() - 1);
+    }
+
     void attach(pixfmt_type& fmt)
     {
         m_pixfmt = &fmt;

src/gfx/gfx_rendering_buffer.cpp

@@ -22,6 +22,7 @@ gfx_rendering_buffer::gfx_rendering_buffer()
 
 gfx_rendering_buffer::gfx_rendering_buffer(byte* ptr, unsigned int width, unsigned int height, int stride)
     : m_buffer(0)
+    , m_observer(0)
     , m_width(0)
     , m_height(0)
     , m_stride(0)
@@ -32,6 +33,12 @@ gfx_rendering_buffer::gfx_rendering_buffer(byte* ptr, unsigned int width, unsign
     init(ptr, width, height, stride);
 }
 
+void gfx_rendering_buffer::replace(byte* ptr, unsigned int width, unsigned int height, int stride)
+{
+    init(ptr, width, height, stride);
+    notify_buffer_changed();
+}
+
 void gfx_rendering_buffer::init(byte* ptr, unsigned int width, unsigned int height, int stride)
 {
     m_buffer = ptr;

src/gfx/gfx_rendering_buffer.h

@@ -30,10 +30,18 @@ class gfx_rendering_buffer : public abstract_rendering_buffer
         }
     } row_data;
 
+    class gfx_buffer_observer
+    {
+    public:
+        virtual ~gfx_buffer_observer() {}
+        virtual void buffer_notify(void) = 0;
+    };
+
     gfx_rendering_buffer();
     gfx_rendering_buffer(byte* ptr, unsigned int width, unsigned int height, int stride);
 
     virtual void init(byte* ptr, unsigned int width, unsigned int height, int stride);
+    virtual void replace(byte* ptr, unsigned int width, unsigned int height, int stride);
 
     virtual unsigned int width(void) const { return m_width; }
     virtual unsigned int height(void) const { return m_height; }
@@ -66,11 +74,14 @@ class gfx_rendering_buffer : public abstract_rendering_buffer
     unsigned int internal_height(void) const { return m_height; }
     int internal_stride(void) const { return m_stride; }
 
+    void set_buffer_observer(gfx_buffer_observer* o) { m_observer = o; }
+    void notify_buffer_changed(void) { if (m_observer) m_observer->buffer_notify(); }
 private:
     gfx_rendering_buffer(const gfx_rendering_buffer&);
     gfx_rendering_buffer& operator=(const gfx_rendering_buffer&);
 
     byte* m_buffer;
+    gfx_buffer_observer*  m_observer;
     pod_array<byte*> m_rows;
     unsigned int m_width; // width in pixels
     unsigned int m_height; // height in pixels

src/include/interfaces.h

@@ -70,6 +70,7 @@ class abstract_rendering_buffer
     virtual ~abstract_rendering_buffer() {}
 
     virtual void init(byte* ptr, unsigned int width, unsigned int height, int stride) = 0;
+    virtual void replace(byte* ptr, unsigned int width, unsigned int height, int stride) = 0;
 
     virtual unsigned int width(void) const = 0;
     virtual unsigned int height(void) const = 0;

src/picasso_rendering_buffer.cpp

@@ -43,7 +43,7 @@ void rendering_buffer::attach(byte* buf, unsigned int width, unsigned int height
 
 void rendering_buffer::replace(byte* buf, unsigned int width, unsigned int height, int stride)
 {
-    m_impl->init(buf, width, height, stride);
+    m_impl->replace(buf, width, height, stride);
 }
 
 bool rendering_buffer::is_empty(void)