From c756245770a28160588011d616fb54298aaae2e4 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Sat, 29 Jun 2013 14:40:55 -0700
Subject: [PATCH] Fixed the logical size for rendering to texture, thanks to
 Mason Wheeler.

Mason Wheeler

The SDL_RenderGetLogicalSize function should always return the amount of pixels that are currently available for rendering to.  But after updating to the latest SDL2, I started getting crashes because it was returning (0,0) as the logical size!  After a bit of debugging, I tracked it down to the following code in SDL_SetRenderTarget:

    if (texture) {
        renderer->viewport.x = 0;
        renderer->viewport.y = 0;
        renderer->viewport.w = texture->w;
        renderer->viewport.h = texture->h;
        renderer->scale.x = 1.0f;
        renderer->scale.y = 1.0f;
        renderer->logical_w = 0;
        renderer->logical_h = 0;
    }

This is obviously wrong; 0 is never the correct value for a valid renderer.  Those last two lines should read:

        renderer->logical_w = texture->w;
        renderer->logical_h = texture->h;
---
 src/render/SDL_render.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/render/SDL_render.c b/src/render/SDL_render.c
index 733760fcc..274645ab2 100644
--- a/src/render/SDL_render.c
+++ b/src/render/SDL_render.c
@@ -950,8 +950,8 @@ SDL_SetRenderTarget(SDL_Renderer *renderer, SDL_Texture *texture)
         renderer->viewport.h = texture->h;
         renderer->scale.x = 1.0f;
         renderer->scale.y = 1.0f;
-        renderer->logical_w = 0;
-        renderer->logical_h = 0;
+        renderer->logical_w = texture->w;
+        renderer->logical_h = texture->h;
     } else {
         renderer->viewport = renderer->viewport_backup;
         renderer->clip_rect = renderer->clip_rect_backup;