[reactos] 01/01: [GDIPLUS] Fix a regression painting gradient CORE-15479

[Joachim Henze]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=daadcc61414330c909625…

commit daadcc61414330c909625c08fe2b909c0bf5621f
Author:     Joachim Henze <Joachim.Henze(a)reactos.org>
AuthorDate: Sun Jan 13 17:14:41 2019 +0100
Commit:     Joachim Henze <Joachim.Henze(a)reactos.org>
CommitDate: Sun Jan 13 17:14:41 2019 +0100

    [GDIPLUS] Fix a regression painting gradient CORE-15479
    
    patch is import of Wine commit 0937186f7d15fed60f77fa2014d650f4d0b6b20b
    by Nikolay Sivov
---
 dll/win32/gdiplus/brush.c | 67 ++++++++++++++++++++++++-----------------------
 1 file changed, 34 insertions(+), 33 deletions(-)

diff --git a/dll/win32/gdiplus/brush.c b/dll/win32/gdiplus/brush.c
index d06832045a..f726023982 100644
--- a/dll/win32/gdiplus/brush.c
+++ b/dll/win32/gdiplus/brush.c
@@ -428,8 +428,8 @@ GpStatus WINGDIPAPI GdipCreateLineBrushFromRect(GDIPCONST GpRectF*
rect,
     GpLineGradient **line)
 {
     GpPointF start, end;
+    float far_x, angle;
     GpStatus stat;
-    float far_x, far_y;
 
     TRACE("(%p, %x, %x, %d, %d, %p)\n", rect, startcolor, endcolor, mode,
           wrap, line);
@@ -437,45 +437,33 @@ GpStatus WINGDIPAPI GdipCreateLineBrushFromRect(GDIPCONST GpRectF*
rect,
     if(!line || !rect)
         return InvalidParameter;
 
-    far_x = rect->X + rect->Width;
-    far_y = rect->Y + rect->Height;
-
     switch (mode)
     {
-    case LinearGradientModeHorizontal:
-        start.X = min(rect->X, far_x);
-        start.Y = rect->Y;
-        end.X = max(rect->X, far_x);
-        end.Y = rect->Y;
-        break;
     case LinearGradientModeVertical:
-        start.X = rect->X;
-        start.Y = min(rect->Y, far_y);
-        end.X = rect->X;
-        end.Y = max(rect->Y, far_y);
+        angle = 90.0f;
         break;
     case LinearGradientModeForwardDiagonal:
-        start.X = min(rect->X, far_x);
-        start.Y = min(rect->Y, far_y);
-        end.X = max(rect->X, far_x);
-        end.Y = max(rect->Y, far_y);
+        angle = 45.0f;
         break;
     case LinearGradientModeBackwardDiagonal:
-        start.X = max(rect->X, far_x);
-        start.Y = min(rect->Y, far_y);
-        end.X = min(rect->X, far_x);
-        end.Y = max(rect->Y, far_y);
+        angle = 135.0f;
         break;
+    case LinearGradientModeHorizontal:
+        far_x = rect->X + rect->Width;
+
+        start.X = min(rect->X, far_x);
+        start.Y = rect->Y;
+        end.X = max(rect->X, far_x);
+        end.Y = rect->Y;
+        stat = GdipCreateLineBrush(&start, &end, startcolor, endcolor, wrap,
line);
+        if (stat == Ok)
+            (*line)->rect = *rect;
+        return stat;
     default:
         return InvalidParameter;
     }
 
-    stat = GdipCreateLineBrush(&start, &end, startcolor, endcolor, wrap, line);
-
-    if (stat == Ok)
-        (*line)->rect = *rect;
-
-    return stat;
+    return GdipCreateLineBrushFromRectWithAngle(rect, startcolor, endcolor, angle, TRUE,
wrap, line);
 }
 
 GpStatus WINGDIPAPI GdipCreateLineBrushFromRectI(GDIPCONST GpRect* rect,
@@ -503,9 +491,9 @@ GpStatus WINGDIPAPI GdipCreateLineBrushFromRectWithAngle(GDIPCONST
GpRectF* rect
     GpLineGradient **line)
 {
     GpStatus stat;
-    LinearGradientMode mode;
-    REAL exofs, eyofs;
+    REAL exofs, eyofs, far_x, far_y;
     REAL sin_angle, cos_angle, sin_cos_angle;
+    GpPointF start, end;
 
     TRACE("(%p, %x, %x, %.2f, %d, %d, %p)\n", rect, startcolor, endcolor,
angle, isAngleScalable,
           wrap, line);
@@ -544,12 +532,25 @@ GpStatus WINGDIPAPI GdipCreateLineBrushFromRectWithAngle(GDIPCONST
GpRectF* rect
     cos_angle = cosf(angle);
     sin_cos_angle = sin_angle * cos_angle;
 
+    far_x = rect->X + rect->Width;
+    far_y = rect->Y + rect->Height;
+
     if (sin_cos_angle >= 0)
-        mode = LinearGradientModeForwardDiagonal;
+    {
+        start.X = min(rect->X, far_x);
+        start.Y = min(rect->Y, far_y);
+        end.X = max(rect->X, far_x);
+        end.Y = max(rect->Y, far_y);
+    }
     else
-        mode = LinearGradientModeBackwardDiagonal;
+    {
+        start.X = max(rect->X, far_x);
+        start.Y = min(rect->Y, far_y);
+        end.X = min(rect->X, far_x);
+        end.Y = max(rect->Y, far_y);
+    }
 
-    stat = GdipCreateLineBrushFromRect(rect, startcolor, endcolor, mode, wrap, line);
+    stat = GdipCreateLineBrush(&start, &end, startcolor, endcolor, wrap, line);
 
     if (stat == Ok)
     {