[freetype2] gsoc-anurag-2022-final f126946b6 1/2: [dense] Add rasterizer functions

[Werner Lemberg]

branch: gsoc-anurag-2022-final
commit f126946b6a87788504e098d24a02bf6c7ef9eff8
Author: Anurag Thakur <anurag105csec21@bpitindia.edu.in>
Commit: Anurag Thakur <anurag105csec21@bpitindia.edu.in>

    [dense] Add rasterizer functions
    
    * src/dense/ftdense.c: (ONE_PIXEL, TRUNC, UPSCALE, DOWNSCALE,
    FT_SWAP, FT_MIN, FT_MAX, FT_ABS): New Macros
    
    (dense_move_to, dense_line_to, dense_conic_to): Added outline
    decomposing functions
    
    (dense_raster_new, dense_raster_done, dense_raster_reset,
    dense_raster_set_mode, dense_raster_render): Added interface
    functions
---
 src/dense/ftdense.c | 175 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 174 insertions(+), 1 deletion(-)

diff --git a/src/dense/ftdense.c b/src/dense/ftdense.c
index fd09b747c..80eab48a2 100644
--- a/src/dense/ftdense.c
+++ b/src/dense/ftdense.c
@@ -1,3 +1,176 @@
 /** The rasterizer for the 'dense' renderer */
 
-/* END */
\ No newline at end of file
+#undef FT_COMPONENT
+#define FT_COMPONENT dense
+
+#include <freetype/ftoutln.h>
+#include <freetype/internal/ftcalc.h>
+#include <freetype/internal/ftdebug.h>
+#include <freetype/internal/ftobjs.h>
+#include <math.h>
+
+#include "ftdense.h"
+#include "ftdenseerrs.h"
+
+#define PIXEL_BITS 8
+
+#define ONE_PIXEL  ( 1 << PIXEL_BITS )
+#define TRUNC( x ) (int)( ( x ) >> PIXEL_BITS )
+
+#define UPSCALE( x )   ( ( x ) * ( ONE_PIXEL >> 6 ) )
+#define DOWNSCALE( x ) ( ( x ) >> ( PIXEL_BITS - 6 ) )
+
+#define FT_SWAP(a, b)   ( (a) ^= (b) ^=(a) ^= (b))
+#define FT_MIN( a, b )  ( (a) < (b) ? (a) : (b) )
+#define FT_MAX( a, b )  ( (a) > (b) ? (a) : (b) )
+#define FT_ABS( a )     ( (a) < 0 ? -(a) : (a) )
+
+
+typedef struct dense_TRaster_
+{
+  void* memory;
+
+} dense_TRaster, *dense_PRaster;
+
+
+static int
+dense_move_to( const FT_Vector* to, dense_worker* worker )
+{
+  FT_Pos x, y;
+
+  x              = UPSCALE( to->x );
+  y              = UPSCALE( to->y );
+  worker->prev_x = x;
+  worker->prev_y = y;
+  return 0;
+}
+
+static int
+dense_line_to( const FT_Vector* to, dense_worker* worker )
+{
+  dense_render_line( worker, UPSCALE( to->x ), UPSCALE( to->y ) );
+  dense_move_to( to, worker );
+  return 0;
+}
+
+void
+dense_render_line( dense_worker* worker, TPos tox, TPos toy )
+{
+  return;
+}
+
+static int
+dense_conic_to( const FT_Vector* control,
+                const FT_Vector* to,
+                dense_worker*    worker )
+{
+  dense_render_quadratic( worker, control, to );
+  return 0;
+}
+
+void
+dense_render_quadratic( dense_worker*    worker,
+                        FT_Vector* control,
+                        FT_Vector* to )
+{
+    return;
+}
+
+static int
+dense_cubic_to( const FT_Vector* control1,
+                const FT_Vector* control2,
+                const FT_Vector* to,
+                dense_worker*    worker )
+{
+  dense_render_cubic( worker, control1, control2, to );
+  return 0;
+}
+
+void
+dense_render_cubic( dense_worker* worker,
+                    FT_Vector*    control_1,
+                    FT_Vector*    control_2,
+                    FT_Vector*    to )
+{
+  return;
+}
+
+static int
+dense_raster_new( FT_Memory memory, dense_PRaster* araster )
+{
+  FT_Error      error;
+  dense_PRaster raster;
+
+  if ( !FT_NEW( raster ) )
+    raster->memory = memory;
+
+  *araster = raster;
+  return error;
+}
+
+static void
+dense_raster_done( FT_Raster raster )
+{
+  FT_Memory memory = (FT_Memory)( (dense_PRaster)raster )->memory;
+
+  FT_FREE( raster );
+}
+
+static void
+dense_raster_reset( FT_Raster      raster,
+                    unsigned char* pool_base,
+                    unsigned long  pool_size )
+{
+  FT_UNUSED( raster );
+  FT_UNUSED( pool_base );
+  FT_UNUSED( pool_size );
+}
+
+static int
+dense_raster_set_mode( FT_Raster raster, unsigned long mode, void* args )
+{
+  FT_UNUSED( raster );
+  FT_UNUSED( mode );
+  FT_UNUSED( args );
+
+  return 0; /* nothing to do */
+}
+
+FT_DEFINE_OUTLINE_FUNCS( dense_decompose_funcs,
+
+                         (FT_Outline_MoveTo_Func)dense_move_to,   /* move_to  
*/
+                         (FT_Outline_LineTo_Func)dense_line_to,   /* line_to  
*/
+                         (FT_Outline_ConicTo_Func)dense_conic_to, /* conic_to 
*/
+                         (FT_Outline_CubicTo_Func)dense_cubic_to, /* cubic_to 
*/
+
+                         0, /* shift    */
+                         0  /* delta    */
+)
+
+static int
+dense_render_glyph( dense_worker* worker, const FT_Bitmap* target )
+{
+  FT_Error error = FT_Outline_Decompose( &( worker->outline ),
+                                         &dense_decompose_funcs, worker );
+  return error;
+}
+
+static int
+dense_raster_render( FT_Raster raster, const FT_Raster_Params* params )
+{
+  return 0;
+}
+
+FT_DEFINE_RASTER_FUNCS(
+    ft_dense_raster,
+
+    FT_GLYPH_FORMAT_OUTLINE,
+
+    (FT_Raster_New_Func)dense_raster_new,           /* raster_new      */
+    (FT_Raster_Reset_Func)dense_raster_reset,       /* raster_reset    */
+    (FT_Raster_Set_Mode_Func)dense_raster_set_mode, /* raster_set_mode */
+    (FT_Raster_Render_Func)dense_raster_render,     /* raster_render   */
+    (FT_Raster_Done_Func)dense_raster_done          /* raster_done     */
+)
+
+/* END */