LibDraw: Create purgeable GraphicsBitmap in the PNG decoder

Also add ImageDecoder APIs for controlling the volatile flag.

3 files changed, 21 insertions, 1 deletions

diff --git a/Libraries/LibDraw/ImageDecoder.h b/Libraries/LibDraw/ImageDecoder.h
index 90ba053184..f3397b9aff 100644
--- a/Libraries/LibDraw/ImageDecoder.h
+++ b/Libraries/LibDraw/ImageDecoder.h
@@ -14,6 +14,9 @@ public:
     virtual Size size() = 0;
     virtual RefPtr<GraphicsBitmap> bitmap() = 0;
 
+    virtual void set_volatile() = 0;
+    [[nodiscard]] virtual bool set_nonvolatile() = 0;
+
 protected:
     ImageDecoderPlugin() {}
 };
@@ -27,6 +30,8 @@ public:
     int width() const { return size().width(); }
     int height() const { return size().height(); }
     RefPtr<GraphicsBitmap> bitmap() const { return m_plugin->bitmap(); }
+    void set_volatile() { m_plugin->set_volatile(); }
+    [[nodiscard]] bool set_nonvolatile() { return m_plugin->set_nonvolatile(); }
 
 private:
     ImageDecoder(const u8*, size_t);
diff --git a/Libraries/LibDraw/PNGLoader.cpp b/Libraries/LibDraw/PNGLoader.cpp
index 3c157df745..508641f1f0 100644
--- a/Libraries/LibDraw/PNGLoader.cpp
+++ b/Libraries/LibDraw/PNGLoader.cpp
@@ -515,7 +515,7 @@ static bool decode_png_bitmap(PNGLoadingContext& context)
 #ifdef PNG_STOPWATCH_DEBUG
         Stopwatch sw("load_png_impl: create bitmap");
 #endif
-        context.bitmap = GraphicsBitmap::create(context.has_alpha() ? GraphicsBitmap::Format::RGBA32 : GraphicsBitmap::Format::RGB32, { context.width, context.height });
+        context.bitmap = GraphicsBitmap::create_purgeable(context.has_alpha() ? GraphicsBitmap::Format::RGBA32 : GraphicsBitmap::Format::RGB32, { context.width, context.height });
     }
 
     unfilter(context);
@@ -701,3 +701,16 @@ RefPtr<GraphicsBitmap> PNGImageDecoderPlugin::bitmap()
     ASSERT(m_context->bitmap);
     return m_context->bitmap;
 }
+
+void PNGImageDecoderPlugin::set_volatile()
+{
+    if (m_context->bitmap)
+        m_context->bitmap->set_volatile();
+}
+
+bool PNGImageDecoderPlugin::set_nonvolatile()
+{
+    if (!m_context->bitmap)
+        return false;
+    return m_context->bitmap->set_nonvolatile();
+}
diff --git a/Libraries/LibDraw/PNGLoader.h b/Libraries/LibDraw/PNGLoader.h
index c72dafe350..f148e6ea25 100644
--- a/Libraries/LibDraw/PNGLoader.h
+++ b/Libraries/LibDraw/PNGLoader.h
@@ -15,6 +15,8 @@ public:
 
     virtual Size size() override;
     virtual RefPtr<GraphicsBitmap> bitmap() override;
+    virtual void set_volatile() override;
+    [[nodiscard]] virtual bool set_nonvolatile() override;
 
 private:
     OwnPtr<PNGLoadingContext> m_context;