Merge commit 'dec0d4ec4153bf9fc2b78ae6c2df45b6ea8dde7a' as 'external/sdl/SDL'

external/sdl/SDL/src/video/SDL_rect.c

@@ -0,0 +1,110 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#include "SDL_rect_c.h"
+
+/* There's no float version of this at the moment, because it's not a public API
+   and internally we only need the int version. */
+SDL_bool SDL_GetSpanEnclosingRect(int width, int height,
+                         int numrects, const SDL_Rect *rects, SDL_Rect *span)
+{
+    int i;
+    int span_y1, span_y2;
+    int rect_y1, rect_y2;
+
+    if (width < 1) {
+        SDL_InvalidParamError("width");
+        return SDL_FALSE;
+    } else if (height < 1) {
+        SDL_InvalidParamError("height");
+        return SDL_FALSE;
+    } else if (rects == NULL) {
+        SDL_InvalidParamError("rects");
+        return SDL_FALSE;
+    } else if (span == NULL) {
+        SDL_InvalidParamError("span");
+        return SDL_FALSE;
+    } else if (numrects < 1) {
+        SDL_InvalidParamError("numrects");
+        return SDL_FALSE;
+    }
+
+    /* Initialize to empty rect */
+    span_y1 = height;
+    span_y2 = 0;
+
+    for (i = 0; i < numrects; ++i) {
+        rect_y1 = rects[i].y;
+        rect_y2 = rect_y1 + rects[i].h;
+
+        /* Clip out of bounds rectangles, and expand span rect */
+        if (rect_y1 < 0) {
+            span_y1 = 0;
+        } else if (rect_y1 < span_y1) {
+            span_y1 = rect_y1;
+        }
+        if (rect_y2 > height) {
+            span_y2 = height;
+        } else if (rect_y2 > span_y2) {
+            span_y2 = rect_y2;
+        }
+    }
+    if (span_y2 > span_y1) {
+        span->x = 0;
+        span->y = span_y1;
+        span->w = width;
+        span->h = (span_y2 - span_y1);
+        return SDL_TRUE;
+    }
+    return SDL_FALSE;
+}
+
+/* For use with the Cohen-Sutherland algorithm for line clipping, in SDL_rect_impl.h */
+#define CODE_BOTTOM 1
+#define CODE_TOP    2
+#define CODE_LEFT   4
+#define CODE_RIGHT  8
+
+/* Same code twice, for float and int versions... */
+#define RECTTYPE                 SDL_Rect
+#define POINTTYPE                SDL_Point
+#define SCALARTYPE               int
+#define COMPUTEOUTCODE           ComputeOutCode
+#define SDL_HASINTERSECTION      SDL_HasRectIntersection
+#define SDL_INTERSECTRECT        SDL_GetRectIntersection
+#define SDL_RECTEMPTY            SDL_RectEmpty
+#define SDL_UNIONRECT            SDL_GetRectUnion
+#define SDL_ENCLOSEPOINTS        SDL_GetRectEnclosingPoints
+#define SDL_INTERSECTRECTANDLINE SDL_GetRectAndLineIntersection
+#include "SDL_rect_impl.h"
+
+#define RECTTYPE                 SDL_FRect
+#define POINTTYPE                SDL_FPoint
+#define SCALARTYPE               float
+#define COMPUTEOUTCODE           ComputeOutCodeFloat
+#define SDL_HASINTERSECTION      SDL_HasRectIntersectionFloat
+#define SDL_INTERSECTRECT        SDL_GetRectIntersectionFloat
+#define SDL_RECTEMPTY            SDL_RectEmptyFloat
+#define SDL_UNIONRECT            SDL_GetRectUnionFloat
+#define SDL_ENCLOSEPOINTS        SDL_GetRectEnclosingPointsFloat
+#define SDL_INTERSECTRECTANDLINE SDL_GetRectAndLineIntersectionFloat
+#include "SDL_rect_impl.h"