From e78601f7c788d1206aa60a57a169bb6d02b748bd Mon Sep 17 00:00:00 2001
From: scuri <scuri>
Date: Sat, 27 Feb 2010 21:49:25 +0000
Subject: Fixed: alpha transparency in CanvasArc and Bezier polygon in the
IMAGERGB driver.
---
src/sim/sim_linepolyfill.c | 44 ++++++++++++++++++++++++--------------------
1 file changed, 24 insertions(+), 20 deletions(-)
(limited to 'src/sim')
diff --git a/src/sim/sim_linepolyfill.c b/src/sim/sim_linepolyfill.c
index 44dda5b..e339fe5 100644
--- a/src/sim/sim_linepolyfill.c
+++ b/src/sim/sim_linepolyfill.c
@@ -719,7 +719,7 @@ void simLineThin(cdCanvas* canvas, int x1, int y1, int x2, int y2)
unsigned short ErrorAccTemp, Weighting;
int DeltaX, DeltaY, XDir;
long aa_fgcolor;
- unsigned char alpha = cdAlpha(canvas->foreground), aa_alpha;
+ unsigned char alpha = cdAlpha(canvas->foreground), aa_alpha1, aa_alpha2;
int no_antialias = !(canvas->simulation->antialias);
unsigned short int ls;
long fgcolor = canvas->foreground;
@@ -841,11 +841,12 @@ void simLineThin(cdCanvas* canvas, int x1, int y1, int x2, int y2)
weighting for the paired pixel.
Combine the Weighting with the existing alpha,
When Weighting is zero alpha must be fully preserved. */
- aa_alpha = (unsigned char)(((255-Weighting) * alpha) / 255);
+ aa_alpha1 = (unsigned char)(((255-Weighting) * alpha) / 255);
+ aa_alpha2 = (unsigned char)((Weighting * alpha) / 255);
- aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha);
+ aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha1);
_cdLineDrawPixel(canvas, x1, y1, ls, aa_fgcolor);
- aa_fgcolor = cdEncodeAlpha(fgcolor, 255-aa_alpha);
+ aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha2);
_cdLineDrawPixel(canvas, x1 + XDir, y1, ls, aa_fgcolor);
ls = simRotateLineStyle(ls);
}
@@ -892,11 +893,12 @@ void simLineThin(cdCanvas* canvas, int x1, int y1, int x2, int y2)
weighting for the paired pixel.
Combine the Weighting with the existing alpha,
When Weighting is zero alpha must be fully preserved. */
- aa_alpha = (unsigned char)(((255-Weighting) * alpha) / 255);
+ aa_alpha1 = (unsigned char)(((255-Weighting) * alpha) / 255);
+ aa_alpha2 = (unsigned char)((Weighting * alpha) / 255);
- aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha);
+ aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha1);
_cdLineDrawPixel(canvas, x1, y1, ls, aa_fgcolor);
- aa_fgcolor = cdEncodeAlpha(fgcolor, 255-aa_alpha);
+ aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha2);
_cdLineDrawPixel(canvas, x1, y1+1, ls, aa_fgcolor);
ls = simRotateLineStyle(ls);
}
@@ -915,7 +917,7 @@ void simfLineThin(cdCanvas* canvas, double x1, double y1, double x2, double y2,
{
double DeltaX, DeltaY, a, b;
long aa_fgcolor;
- unsigned char alpha = cdAlpha(canvas->foreground), aa_alpha;
+ unsigned char alpha = cdAlpha(canvas->foreground), aa_alpha1, aa_alpha2;
int no_antialias = !(canvas->simulation->antialias);
int yi, xi, update_a = 1, update_b = 1;
unsigned short int ls;
@@ -976,11 +978,12 @@ void simfLineThin(cdCanvas* canvas, double x1, double y1, double x2, double y2,
/* Combine the Weighting with the existing alpha,
When Weighting is zero alpha must be fully preserved. */
- aa_alpha = (unsigned char)((1.0-(x - xi)) * alpha);
+ aa_alpha1 = (unsigned char)((1.0-(x - xi)) * alpha);
+ aa_alpha2 = (unsigned char)((x - xi) * alpha);
if (no_antialias)
{
- if (aa_alpha > 128)
+ if (aa_alpha1 > 128)
_cdLineDrawPixel(canvas, xi, yi, ls, fgcolor)
else
_cdLineDrawPixel(canvas, xi+1, yi, ls, fgcolor)
@@ -1000,7 +1003,7 @@ void simfLineThin(cdCanvas* canvas, double x1, double y1, double x2, double y2,
if ((xi != *last_xi_a || yi != *last_yi_a) &&
(xi != *last_xi_b || yi != *last_yi_b))
{
- aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha);
+ aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha1);
_cdLineDrawPixel(canvas, xi, yi, ls, aa_fgcolor);
if (yi == yi_last) /* one pixel only */
@@ -1010,7 +1013,7 @@ void simfLineThin(cdCanvas* canvas, double x1, double y1, double x2, double y2,
if ((xi+1 != *last_xi_a || yi != *last_yi_a) &&
(xi+1 != *last_xi_b || yi != *last_yi_b))
{
- aa_fgcolor = cdEncodeAlpha(fgcolor, 255-aa_alpha);
+ aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha2);
_cdLineDrawPixel(canvas, xi+1, yi, ls, aa_fgcolor);
if (yi == yi_last) /* one pixel only */
@@ -1019,9 +1022,9 @@ void simfLineThin(cdCanvas* canvas, double x1, double y1, double x2, double y2,
}
else
{
- aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha);
+ aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha1);
_cdLineDrawPixel(canvas, xi, yi, ls, aa_fgcolor);
- aa_fgcolor = cdEncodeAlpha(fgcolor, 255-aa_alpha);
+ aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha2);
_cdLineDrawPixel(canvas, xi+1, yi, ls, aa_fgcolor);
}
}
@@ -1062,11 +1065,12 @@ void simfLineThin(cdCanvas* canvas, double x1, double y1, double x2, double y2,
/* Combine the Weighting with the existing alpha,
When Weighting is zero alpha must be fully preserved. */
- aa_alpha = (unsigned char)((1.0-(y - yi)) * alpha);
+ aa_alpha1 = (unsigned char)((1.0-(y - yi)) * alpha);
+ aa_alpha2 = (unsigned char)((y - yi) * alpha);
if (no_antialias)
{
- if (aa_alpha > 128)
+ if (aa_alpha1 > 128)
_cdLineDrawPixel(canvas, xi, yi, ls, fgcolor)
else
_cdLineDrawPixel(canvas, xi, yi+1, ls, fgcolor)
@@ -1086,7 +1090,7 @@ void simfLineThin(cdCanvas* canvas, double x1, double y1, double x2, double y2,
if ((xi != *last_xi_a || yi != *last_yi_a) &&
(xi != *last_xi_b || yi != *last_yi_b))
{
- aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha);
+ aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha1);
_cdLineDrawPixel(canvas, xi, yi, ls, aa_fgcolor);
if (xi == xi_last) /* one pixel only */
@@ -1096,7 +1100,7 @@ void simfLineThin(cdCanvas* canvas, double x1, double y1, double x2, double y2,
if ((xi != *last_xi_a || yi+1 != *last_yi_a) &&
(xi != *last_xi_b || yi+1 != *last_yi_b))
{
- aa_fgcolor = cdEncodeAlpha(fgcolor, 255-aa_alpha);
+ aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha2);
_cdLineDrawPixel(canvas, xi, yi+1, ls, aa_fgcolor);
if (xi == xi_last) /* one pixel only */
@@ -1105,9 +1109,9 @@ void simfLineThin(cdCanvas* canvas, double x1, double y1, double x2, double y2,
}
else
{
- aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha);
+ aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha1);
_cdLineDrawPixel(canvas, xi, yi, ls, aa_fgcolor);
- aa_fgcolor = cdEncodeAlpha(fgcolor, 255-aa_alpha);
+ aa_fgcolor = cdEncodeAlpha(fgcolor, aa_alpha2);
_cdLineDrawPixel(canvas, xi, yi+1, ls, aa_fgcolor);
}
}
--
cgit v1.2.3