From ec2d0decbd739df99cac4baba57fe0005bf4894d Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Mon, 16 Jun 2008 10:03:05 -0600
Subject: [PATCH] mesa: allocate pixel zoom arrays on heap, not stack

Fixes stack overflow on Windows.
---
 src/mesa/swrast/s_context.c |  2 ++
 src/mesa/swrast/s_context.h |  1 +
 src/mesa/swrast/s_zoom.c    | 27 +++++++++++++++++----------
 3 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/src/mesa/swrast/s_context.c b/src/mesa/swrast/s_context.c
index 8e6b28bb4c6..eab9ff3a9e7 100644
--- a/src/mesa/swrast/s_context.c
+++ b/src/mesa/swrast/s_context.c
@@ -832,6 +832,8 @@ _swrast_DestroyContext( GLcontext *ctx )
    }
 
    FREE( swrast->SpanArrays );
+   if (swrast->ZoomedArrays)
+      FREE( swrast->ZoomedArrays );
    FREE( swrast->TexelBuffer );
    FREE( swrast );
 
diff --git a/src/mesa/swrast/s_context.h b/src/mesa/swrast/s_context.h
index 3dcc3ed16e2..a511d1c9a17 100644
--- a/src/mesa/swrast/s_context.h
+++ b/src/mesa/swrast/s_context.h
@@ -206,6 +206,7 @@ typedef struct
     * on some systems.
     */
    SWspanarrays *SpanArrays;
+   SWspanarrays *ZoomedArrays;  /**< For pixel zooming */
 
    /**
     * Used to buffer N GL_POINTS, instead of rendering one by one.
diff --git a/src/mesa/swrast/s_zoom.c b/src/mesa/swrast/s_zoom.c
index 9f1a4c6f0a7..4473078b78a 100644
--- a/src/mesa/swrast/s_zoom.c
+++ b/src/mesa/swrast/s_zoom.c
@@ -1,8 +1,8 @@
 /*
  * Mesa 3-D graphics library
- * Version:  6.5.2
+ * Version:  7.1
  *
- * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
+ * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -130,8 +130,8 @@ static void
 zoom_span( GLcontext *ctx, GLint imgX, GLint imgY, const SWspan *span,
            const GLvoid *src, GLenum format )
 {
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);
    SWspan zoomed;
-   SWspanarrays zoomed_arrays;  /* this is big! */
    GLint x0, x1, y0, y1;
    GLint zoomedWidth;
 
@@ -140,6 +140,13 @@ zoom_span( GLcontext *ctx, GLint imgX, GLint imgY, const SWspan *span,
       return;  /* totally clipped */
    }
 
+   if (!swrast->ZoomedArrays) {
+      /* allocate on demand */
+      swrast->ZoomedArrays = (SWspanarrays *) CALLOC(sizeof(SWspanarrays));
+      if (!swrast->ZoomedArrays)
+         return;
+   }
+
    zoomedWidth = x1 - x0;
    ASSERT(zoomedWidth > 0);
    ASSERT(zoomedWidth <= MAX_WIDTH);
@@ -151,14 +158,14 @@ zoom_span( GLcontext *ctx, GLint imgX, GLint imgY, const SWspan *span,
    INIT_SPAN(zoomed, GL_BITMAP);
    zoomed.x = x0;
    zoomed.end = zoomedWidth;
-   zoomed.array = &zoomed_arrays;
-   zoomed_arrays.ChanType = span->array->ChanType;
-   if (zoomed_arrays.ChanType == GL_UNSIGNED_BYTE)
-      zoomed_arrays.rgba = (GLchan (*)[4]) zoomed_arrays.rgba8;
-   else if (zoomed_arrays.ChanType == GL_UNSIGNED_SHORT)
-      zoomed_arrays.rgba = (GLchan (*)[4]) zoomed_arrays.rgba16;
+   zoomed.array = swrast->ZoomedArrays;
+   zoomed.array->ChanType = span->array->ChanType;
+   if (zoomed.array->ChanType == GL_UNSIGNED_BYTE)
+      zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->rgba8;
+   else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT)
+      zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->rgba16;
    else
-      zoomed_arrays.rgba = (GLchan (*)[4]) zoomed_arrays.attribs[FRAG_ATTRIB_COL0];
+      zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->attribs[FRAG_ATTRIB_COL0];
 
    COPY_4V(zoomed.attrStart[FRAG_ATTRIB_WPOS], span->attrStart[FRAG_ATTRIB_WPOS]);
    COPY_4V(zoomed.attrStepX[FRAG_ATTRIB_WPOS], span->attrStepX[FRAG_ATTRIB_WPOS]);
-- 
2.30.2