sync D3D_RenderReadPixels with D3D11_RenderReadPixels

- use the result of SDL_ConvertPixels to propagate error
- get rid of the verbose error message of D3D11_RenderReadPixels in case SDL_ConvertPixels failed

src/render/direct3d/SDL_render_d3d.c

@@ -1271,6 +1271,7 @@ D3D_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
     RECT d3drect;
     D3DLOCKED_RECT locked;
     HRESULT result;
+    int status;
 
     if (data->currentRenderTarget) {
         backBuffer = data->currentRenderTarget;
@@ -1305,7 +1306,7 @@ D3D_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
         return D3D_SetError("LockRect()", result);
     }
 
-    SDL_ConvertPixels(rect->w, rect->h,
+    status = SDL_ConvertPixels(rect->w, rect->h,
                       D3DFMTToPixelFormat(desc.Format), locked.pBits, locked.Pitch,
                       format, pixels, pitch);
 
@@ -1313,7 +1314,7 @@ D3D_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
 
     IDirect3DSurface9_Release(surface);
 
-    return 0;
+    return status;
 }
 
 static void

src/render/direct3d11/SDL_render_d3d11.c

@@ -2235,30 +2235,20 @@ D3D11_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
     /* Copy the data into the desired buffer, converting pixels to the
      * desired format at the same time:
      */
-    if (SDL_ConvertPixels(
+    status = SDL_ConvertPixels(
         rect->w, rect->h,
         D3D11_DXGIFormatToSDLPixelFormat(stagingTextureDesc.Format),
         textureMemory.pData,
         textureMemory.RowPitch,
         format,
         pixels,
-        pitch) != 0) {
-        /* When SDL_ConvertPixels fails, it'll have already set the format.
-         * Get the error message, and attach some extra data to it.
-         */
-        char errorMessage[1024];
-        SDL_snprintf(errorMessage, sizeof(errorMessage), "%s, Convert Pixels failed: %s", __FUNCTION__, SDL_GetError());
-        SDL_SetError("%s", errorMessage);
-        goto done;
-    }
+        pitch);
 
     /* Unmap the texture: */
     ID3D11DeviceContext_Unmap(data->d3dContext,
         (ID3D11Resource *)stagingTexture,
         0);
 
-    status = 0;
-
 done:
     SAFE_RELEASE(backBuffer);
     SAFE_RELEASE(stagingTexture);