[dense] Populate headers for 'dense' module

* src/dense/ftdenserend.h (ft_dense_renderer_class): New Structures

* src/dense/ftdense.h (dense_worker): New Structure
(dense_render_line, dense_render_quadratic, dense_render_cubic): New
function declarations
(ft_dense_raster): Export dense raster funcs

* src/dense/ftdenseerrs.h: Add module error setup

src/dense/ftdense.h

@@ -1,7 +1,59 @@
+/* Dense rasterizer header*/
 
 #ifndef FTDENSE_H_
 #define FTDENSE_H_
 
+#include <ft2build.h>
+#include FT_CONFIG_CONFIG_H
+#include <freetype/ftimage.h>
+
+FT_BEGIN_HEADER
+
+#ifndef FT_EXPORT_VAR
+#define FT_EXPORT_VAR( x ) extern x
+#endif
+FT_EXPORT_VAR( const FT_Raster_Funcs ) ft_dense_raster;
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+  typedef struct
+  {
+    /** The array used to store signed area differences. */
+    float* m_a;
+    /** The number of elements in m_a. */
+    int m_a_size;
+    /** The width of the current raster in pixels. */
+    int m_w;
+    /** The height of the current raster in pixels. */
+    int m_h;
+    /** The x origin of the raster. */
+    int m_origin_x;
+    /** The y origin of the raster. */
+    int m_origin_y;
+
+    FT_Pos prev_x, prev_y;
+
+    FT_Outline outline;
+  } dense_worker;
+
+  void dense_render_line( dense_worker* worker, FT_Pos to_x, FT_Pos to_y );
+  void dense_render_quadratic( dense_worker* worker,
+                               FT_Vector* control,
+                               FT_Vector* to );
+  void dense_render_cubic( dense_worker* worker,
+                           FT_Vector*    control_1,
+                           FT_Vector*    control_2,
+                           FT_Vector*    to );
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+FT_END_HEADER
+
 #endif /* FTDENSE_H_ */
 
 /* END */

src/dense/ftdenseerrs.h

@@ -1,8 +1,17 @@
-/** Common error defines */
-
+/* Dense Renderer Error Codes */
 #ifndef FTDENSEERRS_H_
 #define FTDENSEERRS_H_
 
+#include <freetype/ftmoderr.h>
+
+#undef FTERRORS_H_
+
+#undef FT_ERR_PREFIX
+#define FT_ERR_PREFIX Dense_Err_
+#define FT_ERR_BASE   FT_Mod_Err_Dense
+
+#include <freetype/fterrors.h>
+
 #endif /* FTDENSEERRS_H_ */
 
 /* END */

src/dense/ftdenserend.h

@@ -1,7 +1,27 @@
-
+/* Dense renderer interface (specification) */
 #ifndef FTDENSEREND_H_
 #define FTDENSEREND_H_
 
+
+#include <freetype/ftmodapi.h>
+#include <freetype/ftrender.h>
+#include <freetype/internal/ftobjs.h>
+
+FT_BEGIN_HEADER
+
+/**************************************************************************
+ *
+ * @renderer:
+ *   ft_dense_renderer_class
+ *
+ * @description:
+ *   Renderer to convert @FT_Outline to bitmaps.
+ *
+ */
+FT_DECLARE_RENDERER( ft_dense_renderer_class )
+
+FT_END_HEADER
+
 #endif /* FTDENSEREND_H_ */
 
 /* END */