From dcbfd5cc35f9e767ae29b3f77e42df7b5b5c05bb Mon Sep 17 00:00:00 2001
From: Mathieu Schroeter <mathieu@schroetersa.ch>
Date: Tue, 10 Oct 2017 18:28:09 +0200
Subject: [PATCH] Add a method to create an empty texture

---
 src/pixmap.cxx | 47 +++++++++++++++++++++++++++++++++++++++++++++--
 src/pixmap.h   |  1 +
 2 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/src/pixmap.cxx b/src/pixmap.cxx
index ae9f029..3f01276 100644
--- a/src/pixmap.cxx
+++ b/src/pixmap.cxx
@@ -212,14 +212,57 @@ CPixmap::ReloadTargetTextures ()
     if (!tex.second.target)
       continue;
 
-    if (!Cache (
-          tex.first, tex.second.file, tex.second.dimTotal, tex.second.dimIcon))
+    if (tex.second.file.empty ())
+    {
+      if (!Cache (tex.first, tex.second.dimTotal))
+        return false;
+    }
+    else if (!Cache (
+               tex.first, tex.second.file, tex.second.dimTotal,
+               tex.second.dimIcon))
       return false;
   }
 
   return true;
 }
 
+bool
+CPixmap::Cache (size_t channel, Point totalDim)
+{
+  if (m_SDLTextureInfo.find (channel) == m_SDLTextureInfo.end ())
+  {
+    m_SDLTextureInfo[channel].texture = SDL_CreateTexture (
+      g_renderer, SDL_PIXELFORMAT_RGBA32, SDL_TEXTUREACCESS_TARGET, totalDim.x,
+      totalDim.y);
+
+    if (!m_SDLTextureInfo[channel].texture)
+    {
+      SDL_LogError (
+        SDL_LOG_CATEGORY_APPLICATION, "Couldn't create texture: %s",
+        SDL_GetError ());
+      return false;
+    }
+
+    SDL_SetTextureBlendMode (
+      m_SDLTextureInfo[channel].texture, SDL_BLENDMODE_BLEND);
+  }
+  else
+  {
+    SDL_SetRenderTarget (g_renderer, m_SDLTextureInfo[channel].texture);
+    SDL_SetRenderDrawColor (g_renderer, 0, 0, 0, 0);
+    SDL_RenderClear (g_renderer);
+    SDL_SetRenderTarget (g_renderer, nullptr);
+  }
+
+  m_SDLTextureInfo[channel].texMask  = nullptr;
+  m_SDLTextureInfo[channel].target   = true;
+  m_SDLTextureInfo[channel].dimIcon  = Point{0, 0};
+  m_SDLTextureInfo[channel].dimTotal = totalDim;
+  m_SDLTextureInfo[channel].file     = "";
+
+  return true;
+}
+
 // Cache une image contenant des ic�nes.
 
 bool
diff --git a/src/pixmap.h b/src/pixmap.h
index 0777281..758f210 100644
--- a/src/pixmap.h
+++ b/src/pixmap.h
@@ -56,6 +56,7 @@ public:
   bool Create (Point dim);
 
   bool ReloadTargetTextures ();
+  bool Cache (size_t channel, Point totalDim);
   bool Cache (
     size_t channel, const std::string & pFilename, Point totalDim,
     Point iconDim);