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LibGfx: Add a sniff method to ImageDecoder and implement for GIF and PNG

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The sniff method is intended to be used for content sniffing. It should be a
cheap test to rapidly rule out whether a candidate image can be successfully
decoded. For the GIF and PNG implementations it simply attempts to decode the
image header, returning true if successful and false if not.
This commit is contained in:
Peter Nelson 2020-04-25 13:51:00 +01:00 • committed by Andreas Kling
parent df0d6e241c
commit 2cd9716b38
5 changed files with 16 additions and 0 deletions
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3
Libraries/LibGfx/ImageDecoder.h
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@ -45,6 +45,8 @@ public:
virtual void set_volatile() = 0;
[[nodiscard]] virtual bool set_nonvolatile() = 0;
virtual bool sniff() = 0;
protected:
ImageDecoderPlugin() {}
};
@ -60,6 +62,7 @@ public:
RefPtr<Gfx::Bitmap> bitmap() const;
void set_volatile() { m_plugin->set_volatile(); }
[[nodiscard]] bool set_nonvolatile() { return m_plugin->set_nonvolatile(); }
bool sniff() { return m_plugin->sniff(); };
private:
ImageDecoder(const u8*, size_t);