OpenGLScreenshotHelper Class Reference

#include <openglscreenshothelper.h>

Inheritance diagram for OpenGLScreenshotHelper:

Public Member Functions
	OpenGLScreenshotHelper ()
	~OpenGLScreenshotHelper ()
void	prepare ()
SDL_Surface *	getScreenshot ()
Public Member Functions inherited from ScreenshotHelper
	ScreenshotHelper ()
virtual	~ScreenshotHelper ()

Private Attributes
FBOInfo	mFbo

Detailed Description

Definition at line 35 of file openglscreenshothelper.h.

Constructor & Destructor Documentation

OpenGLScreenshotHelper()

OpenGLScreenshotHelper::OpenGLScreenshotHelper

(

)

Definition at line 39 of file openglscreenshothelper.cpp.

 :
 ScreenshotHelper(),
 mFbo()
{
}

~OpenGLScreenshotHelper()

OpenGLScreenshotHelper::~OpenGLScreenshotHelper

(

)

Definition at line 45 of file openglscreenshothelper.cpp.

{
}

Member Function Documentation

getScreenshot()

SDL_Surface * OpenGLScreenshotHelper::getScreenshot ( )

virtual

< Surface is in system memory

< Surface is in video memory

< Use asynchronous blits if possible

< Surface is RLE encoded

< Surface is in video memory

< Use asynchronous blits if possible

< Surface is RLE encoded

Implements ScreenshotHelper.

Definition at line 57 of file openglscreenshothelper.cpp.

{
 const int h = mainGraphics->mHeight;
 const int w = mainGraphics->mWidth - (mainGraphics->mWidth % 4);
 GLint pack = 1;
 
 SDL_Surface *const screenshot = MSDL_CreateRGBSurface(
 SDL_SWSURFACE, w, h, 24,
 0xff0000, 0x00ff00, 0x0000ff, 0x000000);
 
 if (screenshot == nullptr)
 return nullptr;
 
 if (SDL_MUSTLOCK(screenshot))
 SDL_LockSurface(screenshot);
 
 const size_t lineSize = 3 * w;
 GLubyte *const buf = new GLubyte[lineSize];
 
 // Grap the pixel buffer and write it to the SDL surface
 mglGetIntegerv(GL_PACK_ALIGNMENT, &pack);
 mglPixelStorei(GL_PACK_ALIGNMENT, 1);
 mglReadPixels(0, 0, w, h, GL_RGB, GL_UNSIGNED_BYTE, screenshot->pixels);
 
 // Flip the screenshot, as OpenGL has 0,0 in bottom left
 const int h2 = h / 2;
 for (int i = 0; i < h2; i++)
 {
 GLubyte *const top = static_cast<GLubyte*>(
 screenshot->pixels) + lineSize * i;
 GLubyte *const bot = static_cast<GLubyte*>(
 screenshot->pixels) + lineSize * (h - 1 - i);
 
 memcpy(buf, top, lineSize);
 memcpy(top, bot, lineSize);
 memcpy(bot, buf, lineSize);
 }
 
 delete [] buf;
 
 if (config.getBoolValue("usefbo"))
 graphicsManager.deleteFBO(&mFbo);
 
 mglPixelStorei(GL_PACK_ALIGNMENT, pack);
 
 if (SDL_MUSTLOCK(screenshot))
 SDL_UnlockSurface(screenshot);
 
 return screenshot;
}

References config, GraphicsManager::deleteFBO(), Configuration::getBoolValue(), graphicsManager, mainGraphics, mFbo, mglGetIntegerv, mglPixelStorei, mglReadPixels, Graphics::mHeight, MSDL_CreateRGBSurface, Graphics::mWidth, Actions::screenshot(), and top.

prepare()

void OpenGLScreenshotHelper::prepare ( )

virtual

Implements ScreenshotHelper.

Definition at line 49 of file openglscreenshothelper.cpp.

{
 if (config.getBoolValue("usefbo"))
 graphicsManager.createFBO(mainGraphics->mWidth,
 mainGraphics->mHeight,
 &mFbo);
}

References config, GraphicsManager::createFBO(), Configuration::getBoolValue(), graphicsManager, mainGraphics, mFbo, Graphics::mHeight, and Graphics::mWidth.

Field Documentation

mFbo

FBOInfo OpenGLScreenshotHelper::mFbo

private

Definition at line 49 of file openglscreenshothelper.h.

Referenced by getScreenshot(), and prepare().

---

The documentation for this class was generated from the following files:

• src/resources/openglscreenshothelper.h (986a3bf)
• src/resources/openglscreenshothelper.cpp (986a3bf)