2.5

First version of region-scaling. WIP commit, so bear with me a while!

- All fixed sized regions have a small 'drag' widget, on the left or top.
  (not yet for free-sized regions, like 4-split).
- Mouse-over on widget changes cursor and allows drag.
- Click on widget hides/reveals.
- Fun for test; 3d view header, if high enough, draws more rows of
  buttons when width is too small.

The WIP stuff;
- It doesn't save yet in files, using the "minsize" variable of region
  definitions, also means other similar areas show same sizes now.
- Definitions for pref size, min/max will be added.
- Properties panel in Fcurve window draws widget on wrong place when
  hidden (subdiv system needs tweak)
- Widgets don't draw perfect yet, also needs further tweaks.

But, in general it's quite fun and usable. :) Many variatians are possible,
like for real tabs, or little icons, or just click-drag on edge.

The reason to first try the widget/tab variation:
- it re-uses the "Area Action Zone" code, widgets for layouting Screens
- it's visible, hotkey-only options for screen layouts are not preferred.
- distinguish clearly area-edges from region-edges this way. Having the
  cursor change shape on every edge (and block input) is probably annoying
  too... but that can be tested.

Later more!

3 files changed, 50 insertions, 9 deletions

diff --git a/source/blender/blenlib/BLI_arithb.h b/source/blender/blenlib/BLI_arithb.h
index 30bb4d11450..787579250ed 100644
--- a/source/blender/blenlib/BLI_arithb.h
+++ b/source/blender/blenlib/BLI_arithb.h
@@ -402,7 +402,7 @@ int AabbIntersectAabb(float min1[3], float max1[3], float min2[3], float max2[3]
 void VecfCubicInterpol(float *x1, float *v1, float *x2, float *v2, float t, float *x, float *v);
 void PointInQuad2DUV(float v0[2], float v1[2], float v2[2], float v3[2], float pt[2], float *uv);
 void PointInFace2DUV(int isquad, float v0[2], float v1[2], float v2[2], float v3[2], float pt[2], float *uv);
-int IsPointInTri2D(float v0[2], float v1[2], float v2[2], float pt[2]);
+int IsPointInTri2D(float v1[2], float v2[2], float v3[2], float pt[2]);
 int IsPointInTri2DInts(int x1, int y1, int x2, int y2, int a, int b);
 int point_in_tri_prism(float p[3], float v1[3], float v2[3], float v3[3]);
 
diff --git a/source/blender/blenlib/intern/arithb.c b/source/blender/blenlib/intern/arithb.c
index 2368f0cd2ba..f111e94a141 100644
--- a/source/blender/blenlib/intern/arithb.c
+++ b/source/blender/blenlib/intern/arithb.c
@@ -4515,6 +4515,21 @@ void PointInFace2DUV(int isquad, float v0[2], float v1[2], float v2[2], float v3
 	}
 }
 
+int IsPointInTri2D(float v1[2], float v2[2], float v3[2], float pt[2])
+{
+	float inp1, inp2, inp3;
+	
+	inp1= (v2[0]-v1[0])*(v1[1]-pt[1]) + (v1[1]-v2[1])*(v1[0]-pt[0]);
+	inp2= (v3[0]-v2[0])*(v2[1]-pt[1]) + (v2[1]-v3[1])*(v2[0]-pt[0]);
+	inp3= (v1[0]-v3[0])*(v3[1]-pt[1]) + (v3[1]-v1[1])*(v3[0]-pt[0]);
+	
+	if(inp1<=0.0f && inp2<=0.0f && inp3<=0.0f) return 1;
+	if(inp1>=0.0f && inp2>=0.0f && inp3>=0.0f) return 1;
+	
+	return 0;
+}
+
+#if 0
 int IsPointInTri2D(float v0[2], float v1[2], float v2[2], float pt[2])
 {
 		/* not for quads, use for our abuse of LineIntersectsTriangleUV */
@@ -4542,6 +4557,7 @@ int IsPointInTri2D(float v0[2], float v1[2], float v2[2], float pt[2])
 		/* Doing this in 3D is not nice */
 		return LineIntersectsTriangle(p1_3d, p2_3d, v0_3d, v1_3d, v2_3d, &lambda, uv);
 }
+#endif
 
 /*
 
diff --git a/source/blender/blenlib/intern/rct.c b/source/blender/blenlib/intern/rct.c
index 48ba18515de..915a93e8e0b 100644
--- a/source/blender/blenlib/intern/rct.c
+++ b/source/blender/blenlib/intern/rct.c
@@ -88,17 +88,42 @@ void BLI_union_rcti(rcti *rct1, rcti *rct2)
 
 void BLI_init_rctf(rctf *rect, float xmin, float xmax, float ymin, float ymax)
 {
-	rect->xmin= xmin;
-	rect->xmax= xmax;
-	rect->ymin= ymin;
-	rect->ymax= ymax;
+	if(xmin <= xmax) {
+		rect->xmin= xmin;
+		rect->xmax= xmax;
+	}
+	else {
+		rect->xmax= xmin;
+		rect->xmin= xmax;
+	}
+	if(ymin <= ymax) {
+		rect->ymin= ymin;
+		rect->ymax= ymax;
+	}
+	else {
+		rect->ymax= ymin;
+		rect->ymin= ymax;
+	}
 }
+
 void BLI_init_rcti(rcti *rect, int xmin, int xmax, int ymin, int ymax)
 {
-	rect->xmin= xmin;
-	rect->xmax= xmax;
-	rect->ymin= ymin;
-	rect->ymax= ymax;
+	if(xmin <= xmax) {
+		rect->xmin= xmin;
+		rect->xmax= xmax;
+	}
+	else {
+		rect->xmax= xmin;
+		rect->xmin= xmax;
+	}
+	if(ymin <= ymax) {
+		rect->ymin= ymin;
+		rect->ymax= ymax;
+	}
+	else {
+		rect->ymax= ymin;
+		rect->ymin= ymax;
+	}
 }
 
 void BLI_translate_rcti(rcti *rect, int x, int y)