added extra functions to Texture

TSE_Core/src/elements/Texture.cpp

@@ -148,6 +148,176 @@ void TSE::Texture::GetPixel(const Vector2 &pos, Color &c) const
     GetPixel(pos.x, pos.y, c);
 }
 
+TSE::Texture TSE::Texture::CutOut(const Vector2 &pos, Vector2 &size) const
+{
+    Texture result = Texture(0,0);
+    if(bmp == nullptr)
+    {
+        TSE_ERROR("Failed to cut out texture. Source bitmap was nullptr.");
+        Texture::makeError(result);
+        return result;
+    }
+
+    const int left = static_cast<int>(pos.x);
+    const int top = static_cast<int>(pos.y);
+    const int width = static_cast<int>(size.x);
+    const int height = static_cast<int>(size.y);
+
+    if(width <= 0 || height <= 0)
+    {
+        TSE_ERROR("Failed to cut out texture. Size must be greater than 0.");
+        Texture::makeError(result);
+        return result;
+    }
+
+    const int texWidth = static_cast<int>(Width());
+    const int texHeight = static_cast<int>(Height());
+    if(left < 0 || top < 0 || left + width > texWidth || top + height > texHeight)
+    {
+        TSE_ERROR("Failed to cut out texture. Region out of bounds.");
+        Texture::makeError(result);
+        return result;
+    }
+
+    FIBITMAP* cut = FreeImage_Copy(bmp, left, top, left + width, top + height);
+    if(cut == nullptr)
+    {
+        TSE_ERROR("Failed to cut out texture. FreeImage_Copy returned nullptr.");
+        Texture::makeError(result);
+        return result;
+    }
+
+    Texture out = Texture(width, height, Bpp);
+    if(out.bmp != nullptr)
+        FreeImage_Unload(out.bmp);
+    out.bmp = cut;
+    out.imagePtr = FreeImage_GetBits(cut);
+    out.Bpp = Bpp;
+    out.chanels = chanels;
+    out.Size = Vector2(width, height);
+    out.Apply();
+    return out;
+}
+
+TSE::Texture TSE::Texture::Upscale(const Vector2 &size) const
+{
+    Texture result = Texture(0,0);
+    if(bmp == nullptr)
+    {
+        TSE_ERROR("Failed to upscale texture. Source bitmap was nullptr.");
+        Texture::makeError(result);
+        return result;
+    }
+
+    const int width = static_cast<int>(size.x);
+    const int height = static_cast<int>(size.y);
+    if(width <= 0 || height <= 0)
+    {
+        TSE_ERROR("Failed to upscale texture. Size must be greater than 0.");
+        Texture::makeError(result);
+        return result;
+    }
+
+    FIBITMAP* scaled = FreeImage_Rescale(bmp, width, height, FILTER_NEAREST);
+    if(scaled == nullptr)
+    {
+        TSE_ERROR("Failed to upscale texture. FreeImage_Rescale returned nullptr.");
+        Texture::makeError(result);
+        return result;
+    }
+
+    Texture out = Texture(width, height, Bpp);
+    if(out.bmp != nullptr)
+        FreeImage_Unload(out.bmp);
+    out.bmp = scaled;
+    out.imagePtr = FreeImage_GetBits(scaled);
+    out.Bpp = Bpp;
+    out.chanels = chanels;
+    out.Size = Vector2(width, height);
+    out.Apply();
+    return out;
+}
+
+TSE::Texture TSE::Texture::Downscale(const Vector2 &size) const
+{
+    Texture result = Texture(0,0);
+    if(bmp == nullptr)
+    {
+        TSE_ERROR("Failed to downscale texture. Source bitmap was nullptr.");
+        Texture::makeError(result);
+        return result;
+    }
+
+    const int width = static_cast<int>(size.x);
+    const int height = static_cast<int>(size.y);
+    if(width <= 0 || height <= 0)
+    {
+        TSE_ERROR("Failed to downscale texture. Size must be greater than 0.");
+        Texture::makeError(result);
+        return result;
+    }
+
+    FIBITMAP* scaled = FreeImage_Rescale(bmp, width, height, FILTER_NEAREST);
+    if(scaled == nullptr)
+    {
+        TSE_ERROR("Failed to downscale texture. FreeImage_Rescale returned nullptr.");
+        Texture::makeError(result);
+        return result;
+    }
+
+    Texture out = Texture(width, height, Bpp);
+    if(out.bmp != nullptr)
+        FreeImage_Unload(out.bmp);
+    out.bmp = scaled;
+    out.imagePtr = FreeImage_GetBits(scaled);
+    out.Bpp = Bpp;
+    out.chanels = chanels;
+    out.Size = Vector2(width, height);
+    out.Apply();
+    return out;
+}
+
+void TSE::Texture::PasteIn(const Vector2 &pos, Texture &t)
+{
+    if(bmp == nullptr)
+    {
+        TSE_ERROR("Failed to paste texture. Destination bitmap was nullptr.");
+        return;
+    }
+    if(t.bmp == nullptr)
+    {
+        TSE_ERROR("Failed to paste texture. Source bitmap was nullptr.");
+        return;
+    }
+    if(Bpp != t.Bpp)
+    {
+        TSE_ERROR("Failed to paste texture. Source and destination Bpp do not match.");
+        return;
+    }
+
+    const int left = static_cast<int>(pos.x);
+    const int top = static_cast<int>(pos.y);
+    const int srcWidth = static_cast<int>(t.Width());
+    const int srcHeight = static_cast<int>(t.Height());
+    const int texWidth = static_cast<int>(Width());
+    const int texHeight = static_cast<int>(Height());
+
+    if(left < 0 || top < 0 || left + srcWidth > texWidth || top + srcHeight > texHeight)
+    {
+        TSE_ERROR("Failed to paste texture. Region out of bounds.");
+        return;
+    }
+
+    if(!FreeImage_Paste(bmp, t.bmp, left, top, 256))
+    {
+        TSE_ERROR("Failed to paste texture. FreeImage_Paste returned false.");
+        return;
+    }
+
+    imagePtr = FreeImage_GetBits(bmp);
+    Apply();
+}
+
 void TSE::Texture::SetPixelNoApply(const Vector2 &pos, const Color &c)
 {
     SetPixelNoApply(pos.x, pos.y, c);