Evan Stade : gdiplus: Change atan2 to gdiplus_arctan2.
Alexandre Julliard
julliard at wine.codeweavers.com
Mon Jul 23 05:55:46 CDT 2007
Module: wine
Branch: master
Commit: 818051de2c8769029049ce3d36c6b856f47496c9
URL: http://source.winehq.org/git/wine.git/?a=commit;h=818051de2c8769029049ce3d36c6b856f47496c9
Author: Evan Stade <estade at gmail.com>
Date: Fri Jul 20 17:50:14 2007 -0700
gdiplus: Change atan2 to gdiplus_arctan2.
---
dlls/gdiplus/gdiplus.c | 11 ++++++++++-
dlls/gdiplus/gdiplus_private.h | 1 +
dlls/gdiplus/graphics.c | 11 ++++-------
3 files changed, 15 insertions(+), 8 deletions(-)
diff --git a/dlls/gdiplus/gdiplus.c b/dlls/gdiplus/gdiplus.c
index e821b18..ee1c49b 100644
--- a/dlls/gdiplus/gdiplus.c
+++ b/dlls/gdiplus/gdiplus.c
@@ -154,7 +154,7 @@ static void unstretch_angle(REAL * angle, REAL rad_x, REAL rad_y)
if(cos(*angle) == 0 || sin(*angle) == 0)
return;
- stretched = atan2(sin(*angle) / rad_y, cos(*angle) / rad_x);
+ stretched = gdiplus_atan2(sin(*angle) / rad_y, cos(*angle) / rad_x);
revs_off = roundr(*angle / (2.0 * M_PI)) - roundr(stretched / (2.0 * M_PI));
stretched += ((REAL)revs_off) * M_PI * 2.0;
*angle = stretched;
@@ -212,3 +212,12 @@ COLORREF ARGB2COLORREF(ARGB color)
(color & 0x00ff00) +
((color & 0xff0000) >> 16);
}
+
+/* Like atan2, but puts angle in correct quadrant if dx is 0. */
+FLOAT gdiplus_atan2(FLOAT dy, FLOAT dx)
+{
+ if((dx == 0.0) && (dy != 0.0))
+ return dy > 0.0 ? M_PI_2 : -M_PI_2;
+
+ return atan2(dy, dx);
+}
diff --git a/dlls/gdiplus/gdiplus_private.h b/dlls/gdiplus/gdiplus_private.h
index 71cfe39..c872481 100644
--- a/dlls/gdiplus/gdiplus_private.h
+++ b/dlls/gdiplus/gdiplus_private.h
@@ -30,6 +30,7 @@
COLORREF ARGB2COLORREF(ARGB color);
extern INT arc2polybezier(GpPointF * points, REAL x1, REAL y1, REAL x2, REAL y2,
REAL startAngle, REAL sweepAngle);
+extern FLOAT gdiplus_atan2(FLOAT dy, FLOAT dx);
static inline INT roundr(REAL x)
{
diff --git a/dlls/gdiplus/graphics.c b/dlls/gdiplus/graphics.c
index b12ddf8..0594c57 100644
--- a/dlls/gdiplus/graphics.c
+++ b/dlls/gdiplus/graphics.c
@@ -146,14 +146,11 @@ static void draw_cap(HDC hdc, COLORREF color, GpLineCap cap, REAL size,
INT i, count;
LOGBRUSH lb;
- if(x2 != x1)
- theta = atan2(y2 - y1, x2 - x1);
- else if(y2 != y1){
- theta = M_PI_2 * (y2 > y1 ? 1.0 : -1.0);
- }
- else
+ if((x1 == x2) && (y1 == y2))
return;
+ theta = gdiplus_atan2(y2 - y1, x2 - x1);
+
brush = CreateSolidBrush(color);
lb.lbStyle = BS_SOLID;
lb.lbColor = color;
@@ -327,7 +324,7 @@ static void shorten_line_percent(REAL x1, REAL y1, REAL *x2, REAL *y2, REAL per
return;
dist = sqrt((*x2 - x1) * (*x2 - x1) + (*y2 - y1) * (*y2 - y1)) * -percent;
- theta = (*x2 == x1 ? M_PI_2 : atan2((*y2 - y1), (*x2 - x1)));
+ theta = gdiplus_atan2((*y2 - y1), (*x2 - x1));
dx = cos(theta) * dist;
dy = sin(theta) * dist;
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