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aug2020
DirectXTex/Texassemble/AnimatedGif.cpp
Chuck Walbourn 1208f96733 Reorganized code in texassmble
2020-07-01 01:37:13 -07:00

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//--------------------------------------------------------------------------------------
// File: AnimatedGif.cpp
//
// Code for converting an animated GIF to a series of texture frames.
//
// References:
// https://code.msdn.microsoft.com/windowsapps/Windows-Imaging-Component-65abbc6a/
// http://www.imagemagick.org/Usage/anim_basics/#dispose
//
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
//
// http://go.microsoft.com/fwlink/?LinkId=248926
//--------------------------------------------------------------------------------------
#pragma warning(push)
#pragma warning(disable : 4005)
#define WIN32_LEAN_AND_MEAN
#define NOMINMAX
#define NODRAWTEXT
#define NOGDI
#define NOMCX
#define NOSERVICE
#define NOHELP
#pragma warning(pop)
#include <memory>
#include <vector>
#include <wrl/client.h>
#include <wincodec.h>
#pragma warning(disable : 4619 4616 26812)
#include "DirectXTex.h"
using namespace DirectX;
using Microsoft::WRL::ComPtr;
namespace
{
enum
{
DM_UNDEFINED = 0,
DM_NONE = 1,
DM_BACKGROUND = 2,
DM_PREVIOUS = 3
};
void FillRectangle(const Image& img, const RECT& destRect, uint32_t color)
{
RECT clipped =
{
(destRect.left < 0) ? 0 : destRect.left,
(destRect.top < 0) ? 0 : destRect.top,
(destRect.right > static_cast<long>(img.width)) ? static_cast<long>(img.width) : destRect.right,
(destRect.bottom > static_cast<long>(img.height)) ? static_cast<long>(img.height) : destRect.bottom
};
auto ptr = reinterpret_cast<uint8_t*>(img.pixels + size_t(clipped.top) * img.rowPitch + size_t(clipped.left) * sizeof(uint32_t));
for (long y = clipped.top; y < clipped.bottom; ++y)
{
auto pixelPtr = reinterpret_cast<uint32_t*>(ptr);
for (long x = clipped.left; x < clipped.right; ++x)
{
*pixelPtr++ = color;
}
ptr += img.rowPitch;
}
}
void BlendRectangle(const Image& composed, const Image& raw, const RECT& destRect, uint32_t transparent)
{
RECT clipped =
{
(destRect.left < 0) ? 0 : destRect.left,
(destRect.top < 0) ? 0 : destRect.top,
(destRect.right > static_cast<long>(composed.width)) ? static_cast<long>(composed.width) : destRect.right,
(destRect.bottom > static_cast<long>(composed.height)) ? static_cast<long>(composed.height) : destRect.bottom
};
auto rawPtr = reinterpret_cast<uint8_t*>(raw.pixels);
auto composedPtr = reinterpret_cast<uint8_t*>(
composed.pixels
+ size_t(clipped.top) * composed.rowPitch
+ size_t(clipped.left) * sizeof(uint32_t));
for (long y = clipped.top; y < clipped.bottom; ++y)
{
auto srcPtr = reinterpret_cast<uint32_t*>(rawPtr);
auto destPtr = reinterpret_cast<uint32_t*>(composedPtr);
for (long x = clipped.left; x < clipped.right; ++x, ++srcPtr, ++destPtr)
{
if (transparent == *srcPtr)
continue;
*destPtr = *srcPtr;
}
rawPtr += raw.rowPitch;
composedPtr += composed.rowPitch;
}
}
}
HRESULT LoadAnimatedGif(const wchar_t* szFile, std::vector<std::unique_ptr<ScratchImage>>& loadedImages, bool usebgcolor)
{
bool iswic2;
auto pWIC = GetWICFactory(iswic2);
if (!pWIC)
return E_NOINTERFACE;
ComPtr<IWICBitmapDecoder> decoder;
HRESULT hr = pWIC->CreateDecoderFromFilename(szFile, nullptr, GENERIC_READ, WICDecodeMetadataCacheOnDemand, decoder.GetAddressOf());
if (FAILED(hr))
return hr;
{
GUID containerFormat;
hr = decoder->GetContainerFormat(&containerFormat);
if (FAILED(hr))
return hr;
if (memcmp(&containerFormat, &GUID_ContainerFormatGif, sizeof(GUID)) != 0)
{
// This function only works for GIF
return HRESULT_FROM_WIN32(ERROR_NOT_SUPPORTED);
}
}
ComPtr<IWICMetadataQueryReader> metareader;
hr = decoder->GetMetadataQueryReader(metareader.GetAddressOf());
if (FAILED(hr))
return hr;
PROPVARIANT propValue;
PropVariantInit(&propValue);
// Get palette
WICColor rgbColors[256] = {};
UINT actualColors = 0;
{
ComPtr<IWICPalette> palette;
hr = pWIC->CreatePalette(palette.GetAddressOf());
if (FAILED(hr))
return hr;
hr = decoder->CopyPalette(palette.Get());
if (FAILED(hr))
return hr;
hr = palette->GetColors(_countof(rgbColors), rgbColors, &actualColors);
if (FAILED(hr))
return hr;
}
// Get background color
UINT bgColor = 0;
if (usebgcolor)
{
// Most browsers just ignore the background color metadata and always use transparency
hr = metareader->GetMetadataByName(L"/logscrdesc/GlobalColorTableFlag", &propValue);
if (SUCCEEDED(hr))
{
bool hasTable = (propValue.vt == VT_BOOL && propValue.boolVal);
PropVariantClear(&propValue);
if (hasTable)
{
hr = metareader->GetMetadataByName(L"/logscrdesc/BackgroundColorIndex", &propValue);
if (SUCCEEDED(hr))
{
if (propValue.vt == VT_UI1)
{
uint8_t index = propValue.bVal;
if (index < actualColors)
{
bgColor = rgbColors[index];
}
}
PropVariantClear(&propValue);
}
}
}
}
// Get global frame size
UINT width = 0;
UINT height = 0;
hr = metareader->GetMetadataByName(L"/logscrdesc/Width", &propValue);
if (FAILED(hr))
return hr;
if (propValue.vt != VT_UI2)
return E_FAIL;
width = propValue.uiVal;
PropVariantClear(&propValue);
hr = metareader->GetMetadataByName(L"/logscrdesc/Height", &propValue);
if (FAILED(hr))
return hr;
if (propValue.vt != VT_UI2)
return E_FAIL;
height = propValue.uiVal;
PropVariantClear(&propValue);
UINT fcount;
hr = decoder->GetFrameCount(&fcount);
if (FAILED(hr))
return hr;
UINT disposal = DM_UNDEFINED;
RECT rct = {};
UINT previousFrame = 0;
for (UINT iframe = 0; iframe < fcount; ++iframe)
{
int transparentIndex = -1;
std::unique_ptr<ScratchImage> frameImage(new (std::nothrow) ScratchImage);
if (!frameImage)
return E_OUTOFMEMORY;
if (disposal == DM_PREVIOUS)
{
hr = frameImage->InitializeFromImage(*loadedImages[previousFrame]->GetImage(0, 0, 0));
}
else if (iframe > 0)
{
hr = frameImage->InitializeFromImage(*loadedImages[iframe - 1]->GetImage(0, 0, 0));
}
else
{
hr = frameImage->Initialize2D(DXGI_FORMAT_B8G8R8A8_UNORM, width, height, 1, 1);
}
if (FAILED(hr))
return hr;
auto composedImage = frameImage->GetImage(0, 0, 0);
if (!iframe)
{
RECT fullRct = { 0, 0, static_cast<long>(width), static_cast<long>(height) };
FillRectangle(*composedImage, fullRct, bgColor);
}
else if (disposal == DM_BACKGROUND)
{
FillRectangle(*composedImage, rct, bgColor);
}
ComPtr<IWICBitmapFrameDecode> frame;
hr = decoder->GetFrame(iframe, frame.GetAddressOf());
if (FAILED(hr))
return hr;
WICPixelFormatGUID pixelFormat;
hr = frame->GetPixelFormat(&pixelFormat);
if (FAILED(hr))
return hr;
if (memcmp(&pixelFormat, &GUID_WICPixelFormat8bppIndexed, sizeof(GUID)) != 0)
{
// GIF is always loaded as this format
return E_UNEXPECTED;
}
ComPtr<IWICMetadataQueryReader> frameMeta;
hr = frame->GetMetadataQueryReader(frameMeta.GetAddressOf());
if (SUCCEEDED(hr))
{
hr = frameMeta->GetMetadataByName(L"/imgdesc/Left", &propValue);
if (SUCCEEDED(hr))
{
hr = (propValue.vt == VT_UI2 ? S_OK : E_FAIL);
if (SUCCEEDED(hr))
{
rct.left = static_cast<long>(propValue.uiVal);
}
PropVariantClear(&propValue);
}
hr = frameMeta->GetMetadataByName(L"/imgdesc/Top", &propValue);
if (SUCCEEDED(hr))
{
hr = (propValue.vt == VT_UI2 ? S_OK : E_FAIL);
if (SUCCEEDED(hr))
{
rct.top = static_cast<long>(propValue.uiVal);
}
PropVariantClear(&propValue);
}
hr = frameMeta->GetMetadataByName(L"/imgdesc/Width", &propValue);
if (SUCCEEDED(hr))
{
hr = (propValue.vt == VT_UI2 ? S_OK : E_FAIL);
if (SUCCEEDED(hr))
{
rct.right = static_cast<long>(propValue.uiVal) + rct.left;
}
PropVariantClear(&propValue);
}
hr = frameMeta->GetMetadataByName(L"/imgdesc/Height", &propValue);
if (SUCCEEDED(hr))
{
hr = (propValue.vt == VT_UI2 ? S_OK : E_FAIL);
if (SUCCEEDED(hr))
{
rct.bottom = static_cast<long>(propValue.uiVal) + rct.top;
}
PropVariantClear(&propValue);
}
disposal = DM_UNDEFINED;
hr = frameMeta->GetMetadataByName(L"/grctlext/Disposal", &propValue);
if (SUCCEEDED(hr))
{
hr = (propValue.vt == VT_UI1 ? S_OK : E_FAIL);
if (SUCCEEDED(hr))
{
disposal = propValue.bVal;
}
PropVariantClear(&propValue);
}
hr = frameMeta->GetMetadataByName(L"/grctlext/TransparencyFlag", &propValue);
if (SUCCEEDED(hr))
{
hr = (propValue.vt == VT_BOOL ? S_OK : E_FAIL);
if (SUCCEEDED(hr) && propValue.boolVal)
{
PropVariantClear(&propValue);
hr = frameMeta->GetMetadataByName(L"/grctlext/TransparentColorIndex", &propValue);
if (SUCCEEDED(hr))
{
hr = (propValue.vt == VT_UI1 ? S_OK : E_FAIL);
if (SUCCEEDED(hr) && propValue.uiVal < actualColors)
{
transparentIndex = static_cast<int>(propValue.uiVal);
}
}
}
PropVariantClear(&propValue);
}
}
UINT w, h;
hr = frame->GetSize(&w, &h);
if (FAILED(hr))
return hr;
ScratchImage rawFrame;
hr = rawFrame.Initialize2D(DXGI_FORMAT_B8G8R8A8_UNORM, w, h, 1, 1);
if (FAILED(hr))
return hr;
ComPtr<IWICFormatConverter> FC;
hr = pWIC->CreateFormatConverter(FC.GetAddressOf());
if (FAILED(hr))
return hr;
hr = FC->Initialize(frame.Get(), GUID_WICPixelFormat32bppBGRA, WICBitmapDitherTypeNone, nullptr, 0, WICBitmapPaletteTypeMedianCut);
if (FAILED(hr))
return hr;
auto img = rawFrame.GetImage(0, 0, 0);
hr = FC->CopyPixels(nullptr, static_cast<UINT>(img->rowPitch), static_cast<UINT>(img->slicePitch), img->pixels);
if (FAILED(hr))
return hr;
if (!iframe || transparentIndex == -1)
{
Rect fullRect(0, 0, img->width, img->height);
hr = CopyRectangle(*img, fullRect, *composedImage, TEX_FILTER_DEFAULT, size_t(rct.left), size_t(rct.top));
if (FAILED(hr))
return hr;
}
else
{
BlendRectangle(*composedImage, *img, rct, rgbColors[transparentIndex]);
}
if (disposal == DM_UNDEFINED || disposal == DM_NONE)
{
previousFrame = iframe;
}
loadedImages.emplace_back(std::move(frameImage));
}
PropVariantClear(&propValue);
return S_OK;
}
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