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LibGfx: Use common class template for PBM/PGM/PPM image loaders

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PBM, PGM, and PPM image loaders are mostly common. The only difference
is how the data is read and the associated magic numbers. The magic
numbers are already made common using the loading contexts. Now make
the implementations common via a class template which accepts the
context to disambiguate.
This commit is contained in:
Lenny Maiorani 2022-03-13 11:58:58 -06:00 • committed by Andreas Kling
parent 786b02730c
commit 6a23dfbc92
7 changed files with 123 additions and 327 deletions
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89
Userland/Libraries/LibGfx/PBMLoader.cpp
View file

@ -13,7 +13,7 @@
namespace Gfx {
static bool read_image_data(PBMLoadingContext& context, Streamer& streamer)
bool read_image_data(PBMLoadingContext& context, Streamer& streamer)
{
u8 byte;
Vector<Gfx::Color> color_data;
@ -64,91 +64,4 @@ static bool read_image_data(PBMLoadingContext& context, Streamer& streamer)
context.state = PBMLoadingContext::State::Bitmap;
return true;
}
PBMImageDecoderPlugin::PBMImageDecoderPlugin(const u8* data, size_t size)
{
m_context = make<PBMLoadingContext>();
m_context->data = data;
m_context->data_size = size;
}
PBMImageDecoderPlugin::~PBMImageDecoderPlugin()
{
}
IntSize PBMImageDecoderPlugin::size()
{
if (m_context->state == PBMLoadingContext::State::Error)
return {};
if (m_context->state < PBMLoadingContext::State::Decoded) {
bool success = decode(*m_context);
if (!success)
return {};
}
return { m_context->width, m_context->height };
}
void PBMImageDecoderPlugin::set_volatile()
{
if (m_context->bitmap)
m_context->bitmap->set_volatile();
}
bool PBMImageDecoderPlugin::set_nonvolatile(bool& was_purged)
{
if (!m_context->bitmap)
return false;
return m_context->bitmap->set_nonvolatile(was_purged);
}
bool PBMImageDecoderPlugin::sniff()
{
if (m_context->data_size < 2)
return false;
if (m_context->data[0] == 'P' && m_context->data[1] == '1')
return true;
if (m_context->data[0] == 'P' && m_context->data[1] == '4')
return true;
return false;
}
bool PBMImageDecoderPlugin::is_animated()
{
return false;
}
size_t PBMImageDecoderPlugin::loop_count()
{
return 0;
}
size_t PBMImageDecoderPlugin::frame_count()
{
return 1;
}
ErrorOr<ImageFrameDescriptor> PBMImageDecoderPlugin::frame(size_t index)
{
if (index > 0)
return Error::from_string_literal("PBMImageDecoderPlugin: Invalid frame index"sv);
if (m_context->state == PBMLoadingContext::State::Error)
return Error::from_string_literal("PBMImageDecoderPlugin: Decoding failed"sv);
if (m_context->state < PBMLoadingContext::State::Decoded) {
bool success = decode(*m_context);
if (!success)
return Error::from_string_literal("PBMImageDecoderPlugin: Decoding failed"sv);
}
VERIFY(m_context->bitmap);
return ImageFrameDescriptor { m_context->bitmap, 0 };
}
}