Commit: e626998a262ebe4f621b88eb09ece1a48c1a3ef8
Author: Anthony Edlin
Date:   Mon Nov 25 13:40:58 2013 +0100
http://developer.blender.org/rBe626998a262ebe4f621b88eb09ece1a48c1a3ef8

UI: fix errors in screen edge drawing, moving and region hiding.

Summary:
- Fixes an off-by-one error in screen_test_scale() which causes the areas and
  regions to draw one pixel bigger on the right and top side of the window,
  therefor hiding one line of pixels.
- Fixes an off-by-one error in rct_fits() which causes regions to incorrectly
  hide even though it would fit inside the area.
- Correctly set the limits for the screen edge move operator so it will always
  go up to AREAMINX and headery.
- Change screen_find_active_scredge() so it doesn't show the arrows cursor on
  the screen edges along the window border.

The import thing to understand is how integer rects are used in this part of the
code. They are constructed as a lower left and top right point and are 
INCLUSIVE.
Meaning that if you have a rect's xmin = 10 and xmax = 30 then the total number
of pixels is 21. So to get the size of a rect you have to do xmax - xmin + 1,
which is easy to forget and result in off-by-one errors.

Reviewed By: brecht

Differential Revision: http://developer.blender.org/D41

===================================================================

M       source/blender/editors/screen/area.c
M       source/blender/editors/screen/screen_edit.c
M       source/blender/editors/screen/screen_intern.h
M       source/blender/editors/screen/screen_ops.c

===================================================================

diff --git a/source/blender/editors/screen/area.c 
b/source/blender/editors/screen/area.c
index fccce03..595f081 100644
--- a/source/blender/editors/screen/area.c
+++ b/source/blender/editors/screen/area.c
@@ -859,10 +859,10 @@ static void region_azone_add(ScrArea *sa, ARegion *ar, 
int alignment)
 static int rct_fits(rcti *rect, char dir, int size)
 {
        if (dir == 'h') {
-               return BLI_rcti_size_x(rect) - size;
+               return BLI_rcti_size_x(rect) + 1 - size;
        }
        else {  /* 'v' */
-               return BLI_rcti_size_y(rect) - size;
+               return BLI_rcti_size_y(rect) + 1 - size;
        }
 }
 
@@ -1157,16 +1157,16 @@ static void region_rect_recursive(wmWindow *win, 
ScrArea *sa, ARegion *ar, rcti
 
 static void area_calc_totrct(ScrArea *sa, int sizex, int sizey)
 {
-       short rt = U.pixelsize > 1.0f ? 1 : 0;
+       short rt = (short) U.pixelsize;
 
-       if (sa->v1->vec.x > 0) sa->totrct.xmin = sa->v1->vec.x + 1 + rt;
+       if (sa->v1->vec.x > 0) sa->totrct.xmin = sa->v1->vec.x + rt;
        else sa->totrct.xmin = sa->v1->vec.x;
-       if (sa->v4->vec.x < sizex - 1) sa->totrct.xmax = sa->v4->vec.x - 1 - rt;
+       if (sa->v4->vec.x < sizex - 1) sa->totrct.xmax = sa->v4->vec.x - rt;
        else sa->totrct.xmax = sa->v4->vec.x;
        
-       if (sa->v1->vec.y > 0) sa->totrct.ymin = sa->v1->vec.y + 1 + rt;
+       if (sa->v1->vec.y > 0) sa->totrct.ymin = sa->v1->vec.y + rt;
        else sa->totrct.ymin = sa->v1->vec.y;
-       if (sa->v2->vec.y < sizey - 1) sa->totrct.ymax = sa->v2->vec.y - 1 - rt;
+       if (sa->v2->vec.y < sizey - 1) sa->totrct.ymax = sa->v2->vec.y - rt;
        else sa->totrct.ymax = sa->v2->vec.y;
        
        /* for speedup */
diff --git a/source/blender/editors/screen/screen_edit.c 
b/source/blender/editors/screen/screen_edit.c
index 356db17..474b9bc 100644
--- a/source/blender/editors/screen/screen_edit.c
+++ b/source/blender/editors/screen/screen_edit.c
@@ -264,7 +264,8 @@ int scredge_is_horizontal(ScrEdge *se)
        return (se->v1->vec.y == se->v2->vec.y);
 }
 
-ScrEdge *screen_find_active_scredge(bScreen *sc, int mx, int my)
+/* need win size to make sure not to include edges along screen edge */
+ScrEdge *screen_find_active_scredge(bScreen *sc, int winsizex, int winsizey, 
int mx, int my)
 {
        ScrEdge *se;
        int safety = U.widget_unit / 10;
@@ -273,20 +274,24 @@ ScrEdge *screen_find_active_scredge(bScreen *sc, int mx, 
int my)
        
        for (se = sc->edgebase.first; se; se = se->next) {
                if (scredge_is_horizontal(se)) {
-                       short min, max;
-                       min = MIN2(se->v1->vec.x, se->v2->vec.x);
-                       max = MAX2(se->v1->vec.x, se->v2->vec.x);
-                       
-                       if (abs(my - se->v1->vec.y) <= safety && mx >= min && 
mx <= max)
-                               return se;
+                       if (se->v1->vec.y > 0 && se->v1->vec.y < winsizey - 1) {
+                               short min, max;
+                               min = MIN2(se->v1->vec.x, se->v2->vec.x);
+                               max = MAX2(se->v1->vec.x, se->v2->vec.x);
+                               
+                               if (abs(my - se->v1->vec.y) <= safety && mx >= 
min && mx <= max)
+                                       return se;
+                       }
                }
                else {
-                       short min, max;
-                       min = MIN2(se->v1->vec.y, se->v2->vec.y);
-                       max = MAX2(se->v1->vec.y, se->v2->vec.y);
-                       
-                       if (abs(mx - se->v1->vec.x) <= safety && my >= min && 
my <= max)
-                               return se;
+                       if (se->v1->vec.x > 0 && se->v1->vec.x < winsizex - 1) {
+                               short min, max;
+                               min = MIN2(se->v1->vec.y, se->v2->vec.y);
+                               max = MAX2(se->v1->vec.y, se->v2->vec.y);
+                               
+                               if (abs(mx - se->v1->vec.x) <= safety && my >= 
min && my <= max)
+                                       return se;
+                       }
                }
        }
        
@@ -677,8 +682,8 @@ static void screen_test_scale(bScreen *sc, int winsizex, 
int winsizey)
                sv->vec.y -= min[1];
        }
        
-       sizex = max[0] - min[0];
-       sizey = max[1] - min[1];
+       sizex = max[0] - min[0] + 1;
+       sizey = max[1] - min[1] + 1;
        
        if (sizex != winsizex || sizey != winsizey) {
                facx = winsizex;
@@ -695,14 +700,14 @@ static void screen_test_scale(bScreen *sc, int winsizex, 
int winsizey)
                        //sv->vec.x += AREAGRID - 1;
                        //sv->vec.x -=  (sv->vec.x % AREAGRID);
 
-                       CLAMP(sv->vec.x, 0, winsizex);
+                       CLAMP(sv->vec.x, 0, winsizex - 1);
                        
                        tempf = ((float)sv->vec.y) * facy;
                        sv->vec.y = (short)(tempf + 0.5f);
                        //sv->vec.y += AREAGRID - 1;
                        //sv->vec.y -=  (sv->vec.y % AREAGRID);
 
-                       CLAMP(sv->vec.y, 0, winsizey);
+                       CLAMP(sv->vec.y, 0, winsizey - 1);
                }
        }
        
@@ -711,9 +716,15 @@ static void screen_test_scale(bScreen *sc, int winsizex, 
int winsizey)
        
        /* make each window at least ED_area_headersize() high */
        for (sa = sc->areabase.first; sa; sa = sa->next) {
-               int headery = ED_area_headersize() + U.pixelsize;
+               int headery = ED_area_headersize();
+               
+               /* adjust headery if verts are along the edge of window */
+               if (sa->v1->vec.y > 0)
+                       headery += U.pixelsize;
+               if (sa->v2->vec.y < winsizey - 1)
+                       headery += U.pixelsize;
                
-               if (sa->v1->vec.y + headery > sa->v2->vec.y) {
+               if (sa->v2->vec.y - sa->v1->vec.y + 1 < headery) {
                        /* lower edge */
                        ScrEdge *se = screen_findedge(sc, sa->v4, sa->v1);
                        if (se && sa->v1 != sa->v2) {
@@ -722,7 +733,7 @@ static void screen_test_scale(bScreen *sc, int winsizex, 
int winsizey)
                                select_connected_scredge(sc, se);
                                
                                /* all selected vertices get the right offset */
-                               yval = sa->v2->vec.y - headery;
+                               yval = sa->v2->vec.y - headery + 1;
                                sv = sc->vertbase.first;
                                while (sv) {
                                        /* if is a collapsed area */
@@ -947,7 +958,7 @@ static void drawscredge_area(ScrArea *sa, int sizex, int 
sizey, int center)
                if (U.pixelsize > 1.0f) {
                
                        glColor3ub(0x50, 0x50, 0x50);
-                       glLineWidth(1.5f * U.pixelsize);
+                       glLineWidth((2.0f * U.pixelsize) - 1);
                        drawscredge_area_draw(sizex, sizey, x1, y1, x2, y2, 0);
                        glLineWidth(1.0f);
                }
@@ -1247,6 +1258,8 @@ static void screen_cursor_set(wmWindow *win, wmEvent 
*event)
 {
        AZone *az = NULL;
        ScrArea *sa;
+       int winsizex = WM_window_pixels_x(win);
+       int winsizey = WM_window_pixels_y(win);
        
        for (sa = win->screen->areabase.first; sa; sa = sa->next)
                if ((az = is_in_area_actionzone(sa, &event->x)))
@@ -1263,7 +1276,7 @@ static void screen_cursor_set(wmWindow *win, wmEvent 
*event)
                }
        }
        else {
-               ScrEdge *actedge = screen_find_active_scredge(win->screen, 
event->x, event->y);
+               ScrEdge *actedge = screen_find_active_scredge(win->screen, 
winsizex, winsizey, event->x, event->y);
                
                if (actedge) {
                        if (scredge_is_horizontal(actedge))
diff --git a/source/blender/editors/screen/screen_intern.h 
b/source/blender/editors/screen/screen_intern.h
index b811fc4..e366a33 100644
--- a/source/blender/editors/screen/screen_intern.h
+++ b/source/blender/editors/screen/screen_intern.h
@@ -53,7 +53,7 @@ void        removedouble_scrverts(bScreen *sc);
 void        removedouble_scredges(bScreen *sc);
 void        removenotused_scredges(bScreen *sc);
 int         scredge_is_horizontal(ScrEdge *se);
-ScrEdge    *screen_find_active_scredge(bScreen *sc, int mx, int my);
+ScrEdge    *screen_find_active_scredge(bScreen *sc, int winsizex, int 
winsizey, int mx, int my);
 
 struct AZone *is_in_area_actionzone(ScrArea *sa, const int xy[2]);
 
diff --git a/source/blender/editors/screen/screen_ops.c 
b/source/blender/editors/screen/screen_ops.c
index cd21580..576d31d 100644
--- a/source/blender/editors/screen/screen_ops.c
+++ b/source/blender/editors/screen/screen_ops.c
@@ -695,8 +695,12 @@ static int actionzone_invoke(bContext *C, wmOperator *op, 
const wmEvent *event)
 
 static int actionzone_modal(bContext *C, wmOperator *op, const wmEvent *event)
 {
+       wmWindow *win = CTX_wm_window(C);
+       bScreen *sc = CTX_wm_screen(C);
        sActionzoneData *sad = op->customdata;
-       
+       int winsizex = WM_window_pixels_x(win);
+       int winsizey = WM_window_pixels_y(win);
+
        switch (event->type) {
                case MOUSEMOVE:
                {
@@ -719,7 +723,7 @@ static int actionzone_modal(bContext *C, wmOperator *op, 
const wmEvent *event)
                                /* once we drag outside the actionzone, 
register a gesture
                                 * check we're not on an edge so join finds the 
other area */
                                is_gesture = ((is_in_area_actionzone(sad->sa1, 
&event->x) != sad->az) &&
-                                             
(screen_find_active_scredge(CTX_wm_screen(C), event->x, event->y) == NULL));
+                                             (screen_find_active_scredge(sc, 
winsizex, winsizey, event->x, event->y) == NULL));
                        }
                        else {
                                const int delta_min = 1;
@@ -988,18 +992,28 @@ typedef struct sAreaMoveData {
        char dir;
 } sAreaMoveData;
 
-/* helper call to move area-edge, sets limits */
-static void area_move_set_limits(bScreen *sc, int dir, int *bigger, int 
*smaller)
+/* helper call to move area-edge, sets limits
+ * need window size in order to get correct limits */
+static void area_move_set_limits(bScreen *sc, int dir, int winsizex, int 
winsizey, int *bigger, int *smaller)
 {
        ScrArea *sa;
-       int areaminy = ED_area_headersize() + U.pixelsize;      // pixelsize is 
used as area divider
+       int areaminy = ED_area_headersize();
+       int areamin;
        
        /* we check all areas and test for free space with MINSIZE */
        *bigger = *smaller = 100000;
        
        for (sa = sc->areabase.first; sa; sa = sa->next) {
                if (dir == 'h') {
-                       int y1 = sa->v2->vec.y - sa->v1->vec.y - areaminy;
+                       int y1;
+                       areamin = areaminy;
+                       
+                       if (sa->v1->vec.y > 0)
+                               areamin += U.pixelsize;
+                       if (sa->v2->vec.y < winsizey - 1)
+                               areamin += U.pixelsize;
+                       
+                       y1 = sa->v2->vec.y - sa->v1->vec.y + 1 - areamin;
                        
                        /* if top or down edge selected, test height */
                        if (sa->v1->editflag && sa->v4->editflag)
@@ -1008,7 +1022,15 @@ static void area_move_set_limits(bScreen *sc, int dir, 
int *bigger, int *smaller
                                *smaller = min_ii(*smaller, y1);
                }
                else {
-                       int x1 = sa->v4->vec.x - sa->v1->vec.x - AREAMINX;
+                       int x1;
+                       areamin = AREAMINX;
+                       
+                       if(sa->v1->vec.x > 0)
+                               areamin += U.pixelsize;
+                       if(sa->v4->vec.x < winsizex - 1)
+                               areamin += U.pixelsize;
+                       
+                       x1 = sa->v4->vec.x - sa->v1->vec.x + 1 - areamin;
                        
                        /* if left or right edge selected, test width */
                        if (sa->v1->editflag && sa->v2->editflag)
@@ -1024,9 +1046,12 @@ static void area_move_set_limits(bScreen *sc, int dir, 
int *bigger, int *smaller
 static int area_move_init(bContext *C, wmOperator *op)
 {
        bScreen *sc = CTX_wm_screen(C);
+       wmWindow *win = CTX_wm_window(C);
        ScrEdge *actedge;
        sAreaMoveData *md;
        ScrVert *v1;
+       int winsizex = WM_window_pixels_x(win);
+       int winsizey = WM_window_pixels_y(win);
        int x, y;
        
        /* required properties */
@@ -1034,7 +1059,7 @

@@ Diff output truncated at 10240 characters. @@

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