OpenGL窗体中如何实现屏幕截图

Pause_break 2008-04-17 05:47:24

Windows采用GDI绘图，OpenGL采用RC绘图，我想在OpenGL窗体中截屏，点击菜单项就可以截取整个窗口，输出BMP图像，不用截图工具，不知道用程序如何实现，能用GDI的截图方式吗？

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rageliu 2008-04-30

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好的方法是使用hook，不过对刷新fps帧率有一些影响

qianlima888 2008-04-30

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bool SnapScreen(LPCSTR filename,int x, int y, int width, int height)
{
//CAcModuleResourceOverride res;
wglMakeCurrent(m_hDC,m_hRC);

if (pDlgPrintSet->m_radiu == 0)
{

GLint viewport[4];
glGetIntegerv( GL_VIEWPORT, viewport );
width = viewport[2];
height = viewport[3];
width -= width%4;
}

GLubyte * bmpBuffer = NULL;
bmpBuffer = (GLubyte *)malloc(width*height*3*sizeof(GLubyte));
if (!bmpBuffer)
return FALSE;
glReadPixels((GLint)x, (GLint)y, (GLint)width, (GLint)height,
GL_BGR_EXT, GL_UNSIGNED_BYTE, bmpBuffer);
wglMakeCurrent(m_hDC,NULL);

FILE *filePtr;
fopen_s(&filePtr, filename, "wb");
if (!filePtr)
return FALSE;

BITMAPFILEHEADER bitmapFileHeader;
BITMAPINFOHEADER bitmapInfoHeader;

bitmapFileHeader.bfType = 0x4D42; //"BM"
bitmapFileHeader.bfSize = width*height*3;
bitmapFileHeader.bfReserved1 = 0;
bitmapFileHeader.bfReserved2 = 0;
bitmapFileHeader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);

bitmapInfoHeader.biSize = sizeof(BITMAPINFOHEADER);
bitmapInfoHeader.biWidth = width;
bitmapInfoHeader.biHeight = height;
bitmapInfoHeader.biPlanes = 1;
bitmapInfoHeader.biBitCount = 24;
bitmapInfoHeader.biCompression = BI_RGB;
bitmapInfoHeader.biSizeImage = 0;
bitmapInfoHeader.biXPelsPerMeter = 0;
bitmapInfoHeader.biYPelsPerMeter = 0;
bitmapInfoHeader.biClrUsed = 0;
bitmapInfoHeader.biClrImportant = 0;

fwrite(&bitmapFileHeader, sizeof(bitmapFileHeader), 1, filePtr);
fwrite(&bitmapInfoHeader, sizeof(bitmapInfoHeader), 1, filePtr);
fwrite(bmpBuffer, width*height*3, 1, filePtr);
fclose(filePtr);
free(bmpBuffer);

return TRUE;
}

Kudeet 2008-04-18

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使用glReadPixels

icosagon 2008-04-17

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ls的方法能截获opengl??

n_yHHy_n 2008-04-17

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// 截屏，将要截的屏幕存放到bitmap对象中。

void CopyScreenToBitmap(int xStartPt, int yStartPt, int width, int height, int xToCopy, int yToCopy)

{

   if ( NULL == m_pBackBitmap )

   {

	m_pBackBitmap = new CBitmap();

   }



   CDC ScrDC,MemDC;



   ScrDC.CreateDC("DISPLAY", NULL, NULL, NULL);

   MemDC.CreateCompatibleDC(&ScrDC);



   m_pBackBitmap->CreateCompatibleBitmap(&ScrDC,width,height);

   MemDC.SelectObject(m_pBackBitmap);



   MemDC.BitBlt(xStartPt, yStartPt, width, height,&ScrDC,xToCopy,yToCopy,SRCCOPY);



   ScrDC.DeleteDC();

   MemDC.DeleteDC();

}