本文主要是介绍UE 将UTextureRenderTarget2D，FTextureResource，FTextureRHIRef，FRHITexture写成图片，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
目录
一，写带通道的RGBA图片（BMP）
1，写BMP图片的代码：
2，获取图片buffer，并写成代码
二，使用UE提供的接口写png图片
1, FTextureResource写成图片
2,UTextureRenderTarget2D写成图片
一，写带通道的RGBA图片（BMP）
1，写BMP图片的代码：
#include "Windows/AllowWindowsPlatformTypes.h"
#include "Windows/PreWindowsApi.h"
#include <windows.h>
#include "Windows/PostWindowsApi.h"
#include "Windows/HideWindowsPlatformTypes.h"inline LONG BmpPitchCB(const BITMAPINFOHEADER* pFormat)
{return ((pFormat->biWidth * (pFormat->biBitCount >> 3) + 3) >> 2) << 2;
}inline HRESULT SaveBmp(LPCTSTR pFileName,const void* pBuf,LONG lBuf_W,LONG lBuf_H,LONG lBuf_Bit,BOOL bAlign)
{if (pBuf == NULL){return E_INVALIDARG;}BITMAPFILEHEADER bfh;BITMAPINFOHEADER bih;memset(&bih, 0, sizeof(bih));bih.biSize = sizeof(bih);bih.biPlanes = 1;bih.biBitCount = (WORD)lBuf_Bit;bih.biWidth = lBuf_W;bih.biHeight = lBuf_H;bih.biSizeImage = BmpPitchCB(&bih) * abs(bih.biHeight);memset(&bfh, 0, sizeof(bfh));bfh.bfType = ((WORD)('M' << 8) | 'B');bfh.bfOffBits = 54;bfh.bfSize = 54 + bih.biSizeImage;// Correct the param// if (bAlign == false){if (bih.biSizeImage == (DWORD)bih.biWidth * bih.biBitCount * abs(bih.biHeight) / 8){bAlign = true;}}//HANDLE hFile = NULL;do{hFile = CreateFile(pFileName,GENERIC_READ | GENERIC_WRITE,FILE_SHARE_READ,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);if (hFile == NULL || hFile == INVALID_HANDLE_VALUE){hFile = NULL;break;}DWORD dwWrited = 0;if (WriteFile(hFile, &bfh, sizeof(bfh), &dwWrited, NULL) == false){break;}if (WriteFile(hFile, &bih, sizeof(bih), &dwWrited, NULL) == false){break;}if (bAlign){if (WriteFile(hFile, pBuf, bih.biSizeImage, &dwWrited, NULL) == false){break;}}else{// bitmap format pitch// ...................................xxx for 32 bit aligned//const BYTE* pRow = static_cast<const BYTE*>(pBuf);const LONG nRow = bih.biSizeImage / abs(bih.biHeight);LONG n = 0;for (n = abs(bih.biHeight); n > 1; n--){if (!WriteFile(hFile, pRow, nRow, &dwWrited, NULL)){break;}pRow += bih.biWidth * bih.biBitCount / 8;}if (n != 1){break;}if (!WriteFile(hFile, pRow, bih.biWidth * bih.biBitCount / 8, &dwWrited, NULL)){break;}LONG nPlus = nRow - bih.biWidth * bih.biBitCount / 8;if (nPlus > 0){if (!WriteFile(hFile, pRow, nPlus, &dwWrited, NULL)){break;}}}CloseHandle(hFile);return S_OK;} while (false);if (hFile){CloseHandle(hFile);}return E_FAIL;
}2，获取图片buffer，并写成代码
UTextureRenderTarget2D* MediaRenderTarget;
FTextureResource* DstTextureRes = MediaRenderTarget->GetResource();
FTextureRHIRef DstTextureRef = DstTextureRes->TextureRHI;
FRHITexture* DstTexture = DstTextureRef->GetTexture2D();
//FRHITexture2D* DstTexture = CapturingRenderTarget->GetResource()->TextureRHI->GetTexture2D();
FIntRect RectTarget(0, 0, DstTexture->GetSizeX(), DstTexture->GetSizeY());
TArray<FColor> DataTarget;
ENQUEUE_RENDER_COMMAND(UPXMediaInputComponent_SaveToImageTarget)([Texture = DstTexture, RectTarget, Data = &DataTarget](FRHICommandListImmediate& RHICmdList) mutable{RHICmdList.ReadSurfaceData(Texture, RectTarget, *Data, FReadSurfaceDataFlags(RCM_UNorm));});if (DataTarget.Num() == RectTarget.Area()){uint8* tempP = new uint8[RectTarget.Width() * RectTarget.Height() * 4];for (int32 i = 0; i < RectTarget.Width() * RectTarget.Height(); i++){tempP[i * 4] = DataTarget[i].B;tempP[i * 4 + 1] = DataTarget[i].G;tempP[i * 4 + 2] = DataTarget[i].R;tempP[i * 4 + 3] = DataTarget[i].A;}SaveBmp(TEXT("D://RHIUpdateTextureReference.bmp"), tempP, RectTarget.Width(), RectTarget.Height(), 32, true);}二，使用UE提供的接口写png图片
1, FTextureResource写成图片
FTextureResource* rhiSource;
FRHITexture* DstTexture = rhiSource->GetTexture2DRHI();
//FRHITexture2D* DstTexture = CapturingRenderTarget->GetResource()->TextureRHI->GetTexture2D();
FIntRect Rect(0, 0, DstTexture->GetSizeX(), DstTexture->GetSizeY());
FString FilePath = TEXT("D://rhiSource.png");
TArray<FColor> Data;
ENQUEUE_RENDER_COMMAND(UPXMediaInputComponent_SaveToImage)([Texture = DstTexture, Rect, Data = &Data](FRHICommandListImmediate& RHICmdList) mutable
{RHICmdList.ReadSurfaceData(Texture, Rect, *Data, FReadSurfaceDataFlags(RCM_UNorm));});
if (Data.Num() == Rect.Area())
{TArray<uint8> Bitmap;FImageUtils::ThumbnailCompressImageArray(Rect.Width(), Rect.Height(), Data, Bitmap);FFileHelper::SaveArrayToFile(Bitmap, *FilePath);
}2,UTextureRenderTarget2D写成图片
UTextureRenderTarget2D* CapturingRenderTarget = MediaRenderTarget;if (CapturingRenderTarget){FRHITexture2D* DstTexture = CapturingRenderTarget->GetResource()->TextureRHI->GetTexture2D();FIntRect Rect(0, 0, DstTexture->GetSizeX(), DstTexture->GetSizeY());TArray<FColor> Data;ENQUEUE_RENDER_COMMAND(UPXMediaInputComponent_SaveToImage)([Texture = DstTexture, Rect, Data = &Data](FRHICommandListImmediate& RHICmdList) mutable{RHICmdList.ReadSurfaceData(Texture, Rect, *Data, FReadSurfaceDataFlags(RCM_UNorm));});FlushRenderingCommands();if (Data.Num() == Rect.Area()){TArray<uint8> Bitmap;FImageUtils::ThumbnailCompressImageArray(Rect.Width(), Rect.Height(), Data, Bitmap);FFileHelper::SaveArrayToFile(Bitmap, *FilePath);}}这篇关于UE 将UTextureRenderTarget2D，FTextureResource，FTextureRHIRef，FRHITexture写成图片的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
