iterjit

1 files changed, 56 insertions, 8 deletions

diff --git a/iterjit.c b/iterjit.c
index e3b8845..e7e1e37 100644
--- a/iterjit.c
+++ b/iterjit.c
@@ -49,7 +49,55 @@
   They are specific to a format, and an intermediate format.
 
   There may also be setup()/setup_line() methods required.
+
+  Flow:
+  - outer loop:
+	- generates outer loop
+	- src/mask/dest have pre-scanline setups called
+	- body is generated by destination iter
+	- src/mask/dest have post-scanline finalizers called
+
+  - destination iter:
+	- for each alignment loop, it generates an inner loop
+	- body of inner loop is generated by combiner
+	- combiner returns pixels or an indication that 
+	     no change is required
+	- destination iter writes back if necessary
+	- advances pointer
+
+  - combiner drives generation of pixels
+  - if there is a mask, then
+	- tell mask iter to load n pixels
+	- generate code to check if all pixels are 0
+	- if it is, then
+		- depending on operator
+			- return 0
+			- return "no change needed"
+	  else:
+		- tell source iter to load n pixels
+		- add code to multiply them together
+		- depending on operator
+			- add code to check if a result is 0xff
+			- if it is, then
+				- return source
+			  else:
+				- tell destination to read a pixel
+				- generate code to combine with source
+				- return result
+	  tell mask iter to advance
+    else:
+          - tell source iter to load n pixels
+	  - depending on operator 
+		- add code to check if source is 0xff
+		- if it is, then
+			- return source
+		  else:
+			- tell destination to read pixel
+			- generate code to combine with source
+			- return result
+    tell source iter to advance
 */
+
 #include <stdio.h>
 #include "simplex86.h"
 #include "simple-reg.h"
@@ -73,11 +121,8 @@ struct jit_src_iter_t
 {
     void (* begin) (jit_src_iter_t *src, jit_t *jit);
     void (* begin_line) (jit_src_iter_t *src, jit_t *jit);
-    op_t (* get_1_pixel) (jit_src_iter_t *src, jit_t *jit);
-    op_t (* get_2_pixels) (jit_src_iter_t *src, jit_t *jit);
-    op_t (* get_4_pixels) (jit_src_iter_t *src, jit_t *jit);
-    op_t (* get_8_pixels) (jit_src_iter_t *src, jit_t *jit);
-    op_t (* get_16_pixels) (jit_src_iter_t *src, jit_t *jit);
+    op_t (* load_pixels) (jit_src_iter_t *src, jit_t *jit, int n_pixels);
+    void (* advance_pixels) (jit_src_iter_t *src, jit_t *jit, int n_pixels);
     void (* end_line) (jit_src_iter_t *src, jit_t *jit);
     void (* end) (jit_src_iter_t *src, jit_t *jit);
 };
@@ -85,12 +130,16 @@ struct jit_src_iter_t
 struct jit_combiner_t
 {
     op_t (* combine) (jit_combiner_t *combiner, jit_t *jit,
-		      op_t s, op_t m, op_t d);
+		      jit_src_iter_t *src,
+		      jit_mask_iter_t *mask,
+		      jit_dest_iter_t *dest);
 };
 
 struct jit_dest_iter_t
 {
     void (* begin) (jit_dest_iter_t *dest, jit_t *jit);
+    op_t (* load_pixels) (jit_dest_iter_t *dest, jit_t *jit, int n_pixels);
+    void (* advance_pixels) (jit_dest_iter_t *dest, jit_t *jit, int n_pixels);
     void (* process_line) (jit_dest_iter_t *dest_iter,
 			   jit_t *jit,
 			   jit_src_iter_t *src_iter,
@@ -104,8 +153,6 @@ dest_a8r8g8b8_begin (jit_dest_iter_t *	dest,
 		     jit_t *		jit)
 {
     BEGIN_ASM (jit->fragment)
-	
-	I_and, al, IMM(8),
     END_ASM ();
 }
 
@@ -127,6 +174,7 @@ dest_a8r8g8b8_process_line (jit_dest_iter_t *dest,
 static void
 dest_a8r8g8b8_end (jit_dest_iter_t *dest, jit_t *jit)
 {
+    
 }
 
 jit_dest_iter_t *