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LibGfx: Don't keep an unused GIF decoder plugin in failed ImageDecoders

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If we can't decode the input data, just have a null decoder. In this
state we simply return a null bitmap and whatever empty values make
sense for each API.

This way, we don't try to decode the same thing over and over since
it's not gonna work anyway. :^)
This commit is contained in:
Andreas Kling 2020-06-13 15:28:04 +02:00
parent e46ee46ed6
commit dc0ed5c860
Notes: sideshowbarker 2024-07-19 05:40:18 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/dc0ed5c860c
2 changed files with 20 additions and 12 deletions
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10
Libraries/LibGfx/ImageDecoder.cpp
View file

@ -33,14 +33,14 @@ namespace Gfx {
ImageDecoder::ImageDecoder(const u8* data, size_t size)
{
m_plugin = make<PNGImageDecoderPlugin>(data, size);
if (m_plugin->sniff()) {
if (m_plugin->sniff())
return;
}
m_plugin = make<GIFImageDecoderPlugin>(data, size);
if (m_plugin->sniff()) {
if (m_plugin->sniff())
return;
}
m_plugin = nullptr;
}
ImageDecoder::~ImageDecoder()
@ -49,6 +49,8 @@ ImageDecoder::~ImageDecoder()
RefPtr<Gfx::Bitmap> ImageDecoder::bitmap() const
{
if (!m_plugin)
return nullptr;
return m_plugin->bitmap();
}

22
Libraries/LibGfx/ImageDecoder.h
View file

@ -68,17 +68,23 @@ public:
static NonnullRefPtr<ImageDecoder> create(const ByteBuffer& data) { return adopt(*new ImageDecoder(data.data(), data.size())); }
~ImageDecoder();
IntSize size() const { return m_plugin->size(); }
bool is_valid() const { return m_plugin; }
IntSize size() const { return m_plugin ? m_plugin->size() : IntSize(); }
int width() const { return size().width(); }
int height() const { return size().height(); }
RefPtr<Gfx::Bitmap> bitmap() const;
void set_volatile() { m_plugin->set_volatile(); }
[[nodiscard]] bool set_nonvolatile() { return m_plugin->set_nonvolatile(); }
bool sniff() const { return m_plugin->sniff(); }
bool is_animated() const { return m_plugin->is_animated(); }
size_t loop_count() const { return m_plugin->loop_count(); }
size_t frame_count() const { return m_plugin->frame_count(); }
ImageFrameDescriptor frame(size_t i) const { return m_plugin->frame(i); }
void set_volatile()
{
if (m_plugin)
m_plugin->set_volatile();
}
[[nodiscard]] bool set_nonvolatile() { return m_plugin ? m_plugin->set_nonvolatile() : false; }
bool sniff() const { return m_plugin ? m_plugin->sniff() : false; }
bool is_animated() const { return m_plugin ? m_plugin->is_animated() : false; }
size_t loop_count() const { return m_plugin ? m_plugin->loop_count() : 0; }
size_t frame_count() const { return m_plugin ? m_plugin->frame_count() : 0; }
ImageFrameDescriptor frame(size_t i) const { return m_plugin ? m_plugin->frame(i) : ImageFrameDescriptor(); }
private:
ImageDecoder(const u8*, size_t);