X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=gfx%2Fgfx_p.h;h=738eb09ebbb6819296b0d258dd444efc2a0ecf92;hb=e26fdac0517f0bcf9251dd557e519c7fb5f0f720;hp=5b483ab1db659bd868689da578c39755eb96a3e6;hpb=1661811803a323488afb5617a01a3263ecff9d9c;p=bertos.git

diff --git a/gfx/gfx_p.h b/gfx/gfx_p.h
index 5b483ab1..738eb09e 100755
--- a/gfx/gfx_p.h
+++ b/gfx/gfx_p.h
@@ -1,4 +1,4 @@
-/*!
+/**
  * \file
  * <!--
  * Copyright 2003, 2004, 2005, 2006 Develer S.r.l. (http://www.develer.com/)
@@ -15,6 +15,12 @@
 
 /*#*
  *#* $Log$
+ *#* Revision 1.7  2006/07/19 12:56:26  bernie
+ *#* Convert to new Doxygen style.
+ *#*
+ *#* Revision 1.6  2006/05/27 17:17:34  bernie
+ *#* Optimize away divisions in RAST_ADDR/MASK macros.
+ *#*
  *#* Revision 1.5  2006/05/25 23:35:40  bernie
  *#* Cleanup.
  *#*
@@ -35,16 +41,23 @@
 #ifndef GFX_GFX_P_H
 #define GFX_GFX_P_H
 
+#include <gfx/gfx.h>
 
 #if CONFIG_BITMAP_FMT == BITMAP_FMT_PLANAR_H_MSB
 
-	#define RAST_ADDR(raster, x, y, stride)  ((raster) + (y) * (stride) + (x) / 8)
-	#define RAST_MASK(raster, x, y)		 (1 << (7 - (x) % 8))
+	/* We use ucoord_t to let the compiler optimize away the division/modulo. */
+	#define RAST_ADDR(raster, x, y, stride) \
+			((raster) + (ucoord_t)(y) * (ucoord_t)(stride) + (ucoord_t)(x) / 8)
+	#define RAST_MASK(raster, x, y) \
+			(1 << (7 - (ucoord_t)(x) % 8))
 
 #elif CONFIG_BITMAP_FMT == BITMAP_FMT_PLANAR_V_LSB
 
-	#define RAST_ADDR(raster, x, y, stride)  ((raster) + ((y) / 8) * (stride) + (x))
-	#define RAST_MASK(raster, x, y)          (1 << ((y) % 8))
+	/* We use ucoord_t to let the compiler optimize away the division/modulo. */
+	#define RAST_ADDR(raster, x, y, stride) \
+			((raster) + ((ucoord_t)(y) / 8) * (ucoord_t)(stride) + (ucoord_t)(x))
+	#define RAST_MASK(raster, x, y) \
+			(1 << ((ucoord_t)(y) % 8))
 
 #else
 	#error Unknown value of CONFIG_BITMAP_FMT
@@ -53,7 +66,7 @@
 #define BM_ADDR(bm, x, y)  RAST_ADDR((bm)->raster, (x), (y), (bm)->stride)
 #define BM_MASK(bm, x, y)  RAST_MASK((bm)->raster, (x), (y))
 
-/*!
+/**
  * Plot a pixel in bitmap \a bm.
  *
  * \note bm is evaluated twice.
@@ -62,7 +75,7 @@
 #define BM_PLOT(bm, x, y) \
 	( *BM_ADDR(bm, x, y) |= BM_MASK(bm, x, y) )
 
-/*!
+/**
  * Clear a pixel in bitmap \a bm.
  *
  * \note bm is evaluated twice.
@@ -71,7 +84,7 @@
 #define BM_CLEAR(bm, x, y) \
 	( *BM_ADDR(bm, x, y) &= ~BM_MASK(bm, x, y) )
 
-/*!
+/**
  * Set a pixel in bitmap \a bm to the specified color.
  *
  * \note bm is evaluated twice.
@@ -85,7 +98,7 @@
 		*p = (*p & ~mask) | ((fg_pen) ? mask : 0); \
 	} while (0)
 
-/*!
+/**
  * Get the value of the pixel in bitmap \a bm.
  *
  * \return The returned value is either 0 or 1.