mirror of
https://github.com/matrix-construct/construct
synced 2024-12-25 15:04:10 +01:00
198 lines
3.9 KiB
C++
198 lines
3.9 KiB
C++
// The Construct
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//
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// Copyright (C) The Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2021 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#include <RB_INC_PNG_H
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namespace ircd::png
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{
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#ifdef HAVE_PNG_H
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static void handle_error(png_structp, const char *) noexcept(false);
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static void handle_warn(png_structp, const char *) noexcept;
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static void *handle_alloc(png_structp, size_t) noexcept;
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static void handle_free(png_structp, void *) noexcept;
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static void handle_read(png_structp, uint8_t *, size_t) noexcept;
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#endif
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extern log::log log;
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}
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decltype(ircd::png::log)
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ircd::png::log
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{
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"png"
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};
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decltype(ircd::png::version_api)
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ircd::png::version_api
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{
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"png", info::versions::API,
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#ifdef HAVE_PNG_H
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PNG_LIBPNG_VER,
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{
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PNG_LIBPNG_VER_MAJOR,
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PNG_LIBPNG_VER_MINOR,
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PNG_LIBPNG_VER_RELEASE,
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},
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rstrip(lstrip(PNG_HEADER_VERSION_STRING, " "), "\n")
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#endif
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};
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/// Since libpng may not have loaded prior to static initialization there is
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/// no linked library identification. libmagick takes care of loading libpng
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/// dynamically if it requires it for us.
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decltype(ircd::png::version_abi)
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ircd::png::version_abi
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{
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"png", info::versions::ABI,
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};
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bool
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ircd::png::is_animated(const const_buffer &buf)
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#if defined(HAVE_PNG_H) && defined(PNG_APNG_SUPPORTED)
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{
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// Cannot be a PNG
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if(unlikely(size(buf) < 8))
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return false;
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png_infop info {nullptr};
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png_structp handle
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{
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png_create_read_struct_2
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(
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PNG_LIBPNG_VER_STRING,
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nullptr,
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&handle_error,
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&handle_warn,
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nullptr,
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&handle_alloc,
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&handle_free
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)
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};
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const unwind destroy
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{
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[&handle, &info]
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{
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png_destroy_read_struct(&handle, &info, nullptr);
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}
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};
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if(unlikely(!handle))
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return false;
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if(unlikely(!(info = png_create_info_struct(handle))))
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return false;
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const_buffer src {buf};
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png_set_read_fn(handle, &src, &handle_read);
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// Invokes the read callback a few times to traverse the buffer.
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png_read_info(handle, info);
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// If there's a non-zero result there's acTL for animation.
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uint32_t num_frames {0}, num_plays {0};
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return png_get_acTL(handle, info, &num_frames, &num_plays) != 0;
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}
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#else
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{
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#warning "An upgraded version of libpng is required for animation detection."
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return false;
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}
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#endif
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#ifdef HAVE_PNG_H
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void
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ircd::png::handle_read(png_structp handle,
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uint8_t *const ptr,
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size_t size)
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noexcept
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{
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// Destination where libpng wants data
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const mutable_buffer dst
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{
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reinterpret_cast<char *>(ptr), size
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};
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// Get source buffer from our callback user data.
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const_buffer &src
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{
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*reinterpret_cast<const_buffer *>(png_get_io_ptr(handle))
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};
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// Copy from our buffer to libpng buffer.
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const size_t copied
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{
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copy(dst, src)
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};
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// Advance our source pointer for the amount copied.
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const size_t consumed
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{
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consume(src, copied)
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};
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assert(copied == consumed);
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}
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#endif
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#ifdef HAVE_PNG_H
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void *
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ircd::png::handle_alloc(png_structp handle,
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size_t size)
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noexcept
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{
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return std::malloc(size);
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}
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#endif
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#ifdef HAVE_PNG_H
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void
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ircd::png::handle_free(png_structp handle,
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void *const ptr)
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noexcept
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{
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std::free(ptr);
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}
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#endif
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#ifdef HAVE_PNG_H
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void
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ircd::png::handle_warn(png_structp handle,
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const char *const msg)
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noexcept
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{
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log::dwarning
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{
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log, "handle(%p) :%s",
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static_cast<const void *>(handle),
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msg,
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};
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}
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#endif
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#ifdef HAVE_PNG_H
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void
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ircd::png::handle_error(png_structp handle,
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const char *const msg)
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noexcept(false)
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{
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log::error
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{
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log, "handle(%p) :%s",
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static_cast<const void *>(handle),
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msg,
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};
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throw error
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{
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"%s", msg
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};
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}
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#endif
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