[vlc-devel] [PATCH 3/4] doc: D3D11 callbacks: set the rendering size when the window size changes

[Steve Lhomme]

---
 doc/libvlc/d3d11_player.cpp | 38 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/doc/libvlc/d3d11_player.cpp b/doc/libvlc/d3d11_player.cpp
index a287afbb4e..4d746fcfd8 100644
--- a/doc/libvlc/d3d11_player.cpp
+++ b/doc/libvlc/d3d11_player.cpp
@@ -39,6 +39,10 @@ struct render_context
     ID3D11Texture2D          *texture;
     ID3D11ShaderResourceView *textureShaderInput;
     ID3D11RenderTargetView   *textureRenderTarget;
+
+    unsigned width, height;
+    void (*RepotSize)(void *ReportOpaque, unsigned width, unsigned height);
+    void *ReportOpaque;
 };
 
 static bool UpdateOutput_cb( void *opaque, const libvlc_video_direct3d_cfg_t *cfg, libvlc_video_output_cfg_t *out )
@@ -185,6 +189,15 @@ static bool Setup_cb( void **opaque, const libvlc_video_direct3d_device_cfg_t *c
 {
     struct render_context *ctx = static_cast<struct render_context *>(*opaque);
     out->device_context = ctx->d3dctx;
+    ctx->RepotSize = cfg->repot_size_change;
+    ctx->ReportOpaque = cfg->report_opaque;
+
+    if (ctx->RepotSize != nullptr)
+    {
+        /* report our initial size */
+        ctx->RepotSize(ctx->ReportOpaque, ctx->width, ctx->height);
+    }
+
     return true;
 }
 
@@ -378,8 +391,31 @@ static void release_direct3d(struct render_context *ctx)
 
 static LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 {
+    if( message == WM_CREATE )
+    {
+        /* Store p_mp for future use */
+        CREATESTRUCT *c = (CREATESTRUCT *)lParam;
+        SetWindowLongPtr( hWnd, GWLP_USERDATA, (LONG_PTR)c->lpCreateParams );
+        return 0;
+    }
+
+    LONG_PTR p_user_data = GetWindowLongPtr( hWnd, GWLP_USERDATA );
+    if( p_user_data == 0 )
+        return DefWindowProc(hWnd, message, wParam, lParam);
+    struct render_context *ctx = (struct render_context *)p_user_data;
+
     switch(message)
     {
+        case WM_SIZE:
+        {
+            /* tell libvlc that our size has changed */
+            ctx->width  = LOWORD(lParam) * (BORDER_RIGHT - BORDER_LEFT) / 2.0f; /* remove the orange part ! */
+            ctx->height = HIWORD(lParam) * (BORDER_TOP - BORDER_BOTTOM) / 2.0f;
+            if (ctx->RepotSize != nullptr)
+                ctx->RepotSize(ctx->ReportOpaque, ctx->width, ctx->height);
+        }
+        break;
+
         case WM_DESTROY:
             PostQuitMessage(0);
             return 0;
@@ -441,7 +477,7 @@ int WINAPI WinMain(HINSTANCE hInstance,
                           NULL,
                           NULL,
                           hInstance,
-                          p_mp);
+                          &Context);
 
     ShowWindow(hWnd, nCmdShow);
 
-- 
2.17.1