This is the second in a series of patches to Evas files.
The main thrust of these is to "improve" the drawing/blending
C functions in the "engines/common" dir via the following:
1) Replace the current formula for the new destination
alpha (when blending to rgba) by the formula
BLEND_COLOR(a, A_VAL(dst), 255, A_VAL(dst), tmp)
where "a" is the relevant alpha value.
2) Add tests, where appropiate, for the blending alpha
value cases 0 and 255, and replace the latter with simpler 'copy'
type equations.
3) Improve the accuracy of the "blend_alpha_color_pixel"
and "blend_pixel_mult_pixel" types of functions by replacing
equations of the form
nc = ((c + 1) * cc) >> 8
with a macro defined by
MULT_COLOR(nc, c, cc, tmp) \
{ \
(tmp) = (c) * (cc); \
(nc) = ((tmp) + ((tmp) >> 8) + 0x80) >> 8; \
}
This can also be defined as BLEND_COLOR(c, nc, cc, 0, tmp),
but I believe it merits its own separate definition.
The macro has been added to the file "evas_common.h"
of the "include" dir, and is used by some of the subsequent
patches.
This patch involves the above mentioned file, and the
file "evas_blend_ops.h"
jose.
-------------------------------------------------------------------------
----------------------------
----------------------------------------------
for evas_blend_ops.h
----------------------------------------------
Index: cvs/e17/libs/evas/src/lib/engines/common/evas_blend_ops.h
===================================================================
RCS file:
/cvsroot/enlightenment/e17/libs/evas/src/lib/engines/common/evas_blend_op
s.h,v
retrieving revision 1.1
diff -u -r1.1 evas_blend_ops.h
--- cvs/e17/libs/evas/src/lib/engines/common/evas_blend_ops.h 30 Jan 2004
05:46:57 -0000 1.1
+++ cvs/e17/libs/evas/src/lib/engines/common/evas_blend_ops.h 17 Mar 2004
07:32:45 -0000
@@ -9,6 +9,9 @@
if (A_VAL(src)) /* hmmm - do we need this? */ \
{ \
__a = _evas_pow_lut[A_VAL(src)][A_VAL(dst)]; \
+ BLEND_COLOR(A_VAL(src), A_VAL(dst), \
+ 255, A_VAL(dst), \
+ __tmp); \
BLEND_COLOR(__a, R_VAL(dst), \
R_VAL(src), R_VAL(dst), \
__tmp); \
@@ -18,7 +21,6 @@
BLEND_COLOR(__a, B_VAL(dst), \
B_VAL(src), B_VAL(dst), \
__tmp); \
- A_VAL(dst) = A_VAL(dst) + ((A_VAL(src) * (255 - A_VAL(dst))) / 255);\
} \
}
----------------------------------------------
for evas_common.h
----------------------------------------------
Index: cvs/e17/libs/evas/src/lib/include/evas_common.h
===================================================================
RCS file:
/cvsroot/enlightenment/e17/libs/evas/src/lib/include/evas_common.h,v
retrieving revision 1.23
diff -u -r1.23 evas_common.h
--- cvs/e17/libs/evas/src/lib/include/evas_common.h 30 Jan 2004 05:46:57
-0000 1.23
+++ cvs/e17/libs/evas/src/lib/include/evas_common.h 17 Mar 2004 07:17:19
-0000
@@ -545,6 +545,12 @@
#define PIXEL_SOLID_ALPHA 0xff000000
+#define MULT_COLOR(nc, c, cc, tmp) \
+{ \
+ (tmp) = (c) * (cc); \
+ (nc) = ((tmp) + ((tmp) >> 8) + 0x80) >> 8; \
+}
+
#define SPANS_COMMON(x1, w1, x2, w2) \
(!((((x2) + (w2)) <= (x1)) || ((x2) >= ((x1) + (w1)))))
#define RECTS_INTERSECT(x, y, w, h, xx, yy, ww, hh) \
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