From 1912eaa34df5891af0f46141411e53da945ef54d Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Mon, 14 Dec 2009 06:35:59 +0000
Subject: [PATCH] Added a test to check the read/write pixels API

---
 test/automated/common/common.c |  1 -
 test/automated/render/render.c | 29 +++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/test/automated/common/common.c b/test/automated/common/common.c
index 7abf0a68a..60da7b864 100644
--- a/test/automated/common/common.c
+++ b/test/automated/common/common.c
@@ -82,7 +82,6 @@ int surface_compare( SDL_Surface *sur, const SurfaceImage_t *img, int allowable_
 
       bpp = sur->format->BytesPerPixel;
 
-      /* Compare image - should be same format. */
       if (bpp == 4) {
          for (j=0; j<sur->h; j++) {
             for (i=0; i<sur->w; i++) {
diff --git a/test/automated/render/render.c b/test/automated/render/render.c
index 91fe5138e..f87e151e8 100644
--- a/test/automated/render/render.c
+++ b/test/automated/render/render.c
@@ -37,6 +37,7 @@ static int render_hasTexColor (void);
 static int render_hasTexAlpha (void);
 static int render_clearScreen (void);
 /* Testcases. */
+static int render_testReadWrite (void);
 static int render_testPrimitives (void);
 static int render_testPrimitivesBlend (void);
 static int render_testBlit (void);
@@ -362,6 +363,31 @@ static int render_clearScreen (void)
 }
 
 
+/**
+ * @brief Test reading and writing framebuffer
+ */
+static int render_testReadWrite (void)
+{
+   int ret;
+   SDL_Rect rect;
+
+   /* Write pixels. */
+   rect.x = 0;
+   rect.y = 0;
+   rect.w = 80;
+   rect.h = 60;
+   ret = SDL_RenderWritePixels( &rect, SDL_PIXELFORMAT_RGB24, img_primitives.pixel_data, img_primitives.width*img_primitives.bytes_per_pixel );
+   if (SDL_ATassert( "SDL_RenderWritePixels", ret==0) )
+      return 1;
+
+   /* See if it's the same. */
+   if (render_compare( "Read/write output not the same.", &img_primitives, ALLOWABLE_ERROR_OPAQUE ))
+      return -1;
+
+   return 0;
+}
+
+
 /**
  * @brief Tests the SDL primitives for rendering.
  */
@@ -932,6 +958,9 @@ int render_runTests (void)
       SDL_ATprintVerbose( 1, "      Texture Alpha Mod supported\n" );
 
    /* Software surface blitting. */
+   ret = render_testReadWrite();
+   if (ret)
+      return -1;
    ret = render_testPrimitives();
    if (ret)
       return -1;