Magic_Game/src/kiwano/render/GifImage.cpp

// Copyright (c) 2016-2018 Kiwano - Nomango
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#include <kiwano/render/GifImage.h>
#include <kiwano/render/Renderer.h>
#include <kiwano/core/Logger.h>

namespace kiwano
{
	GifImage::GifImage()
		: frames_count_(0)
		, width_in_pixels_(0)
		, height_in_pixels_(0)
	{
	}

	bool GifImage::Load(String const& file_path)
	{
		Renderer::Instance().CreateGifImage(*this, file_path);

		if (IsValid())
		{
			if (FAILED(GetGlobalMetadata()))
			{
				SetDecoder(nullptr);
				return false;
			}
			return true;
		}
		return false;
	}

	bool GifImage::Load(Resource const& res)
	{
		Renderer::Instance().CreateGifImage(*this, res);

		if (IsValid())
		{
			if (FAILED(GetGlobalMetadata()))
			{
				SetDecoder(nullptr);
				return false;
			}
			return true;
		}
		return false;
	}

	bool GifImage::IsValid() const
	{
		return decoder_ != nullptr;
	}

	GifImage::Frame GifImage::GetFrame(uint32_t index)
	{
		Frame frame;
		Renderer::Instance().CreateGifImageFrame(frame, *this, index);
		return frame;
	}

	HRESULT GifImage::GetGlobalMetadata()
	{
		HRESULT hr = decoder_ ? S_OK : E_FAIL;

		if (SUCCEEDED(hr))
		{
			hr = decoder_->GetFrameCount(&frames_count_);
		}

		if (SUCCEEDED(hr))
		{
			ComPtr<IWICMetadataQueryReader> metadata_reader;
			hr = decoder_->GetMetadataQueryReader(&metadata_reader);

			if (SUCCEEDED(hr))
			{
				uint32_t width = 0;
				uint32_t height = 0;

				PROPVARIANT prop_val;
				::PropVariantInit(&prop_val);

				// <20><>ȡȫ<C8A1><C8AB> frame <20><>С
				if (SUCCEEDED(hr))
				{
					// <20><>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD>
					hr = metadata_reader->GetMetadataByName(L"/logscrdesc/Width", &prop_val);

					if (SUCCEEDED(hr))
					{
						hr = (prop_val.vt == VT_UI2 ? S_OK : E_FAIL);
						if (SUCCEEDED(hr))
						{
							width = prop_val.uiVal;
						}
						::PropVariantClear(&prop_val);
					}
				}

				if (SUCCEEDED(hr))
				{
					// <20><>ȡ<EFBFBD>߶<EFBFBD>
					hr = metadata_reader->GetMetadataByName(L"/logscrdesc/Height", &prop_val);

					if (SUCCEEDED(hr))
					{
						hr = (prop_val.vt == VT_UI2 ? S_OK : E_FAIL);
						if (SUCCEEDED(hr))
						{
							height = prop_val.uiVal;
						}
						::PropVariantClear(&prop_val);
					}
				}

				if (SUCCEEDED(hr))
				{
					// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݺ<EFBFBD><DDBA><EFBFBD>
					hr = metadata_reader->GetMetadataByName(L"/logscrdesc/PixelAspectRatio", &prop_val);

					if (SUCCEEDED(hr))
					{
						hr = (prop_val.vt == VT_UI1 ? S_OK : E_FAIL);
						if (SUCCEEDED(hr))
						{
							if (prop_val.bVal != 0)
							{
								// <20><>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
								// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 1<><31>4<EFBFBD><34><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 4<><34>1<EFBFBD><31><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ 1/64
								float pixel_asp_ratio = (prop_val.bVal + 15.f) / 64.f;

								// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>س<EFBFBD><D8B3><EFBFBD><EFBFBD>ȼ<EFBFBD><C8BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD>ͼ<EFBFBD><CDBC><EFBFBD><EFBFBD><EFBFBD>Ⱥ͸߶ȣ<DFB6>ֻ<EFBFBD><D6BB>Сͼ<D0A1><CDBC>
								if (pixel_asp_ratio > 1.f)
								{
									width_in_pixels_ = width;
									height_in_pixels_ = static_cast<uint32_t>(height / pixel_asp_ratio);
								}
								else
								{
									width_in_pixels_ = static_cast<uint32_t>(width * pixel_asp_ratio);
									height_in_pixels_ = height;
								}
							}
							else
							{
								// ֵΪ 0, <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ر<EFBFBD>Ϊ 1
								width_in_pixels_ = width;
								height_in_pixels_ = height;
							}
						}
						::PropVariantClear(&prop_val);
					}
				}
				::PropVariantClear(&prop_val);
			}
		}
		return hr;
	}

}