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#279 Create QImage from offscreen frame buffer object

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This commit is contained in:
Magne Sjaastad 2016-10-28 19:16:27 +02:00
parent 8d2d4dfe30
commit 5f484abc2d
2 changed files with 31 additions and 3 deletions
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32
Fwk/AppFwk/cafViewer/cafViewer.cpp
View File

@ -119,7 +119,9 @@ caf::Viewer::Viewer(const QGLFormat& format, QWidget* parent)
m_releaseOGLResourcesEachFrame(false),
m_paintCounter(0),
m_navigationPolicyEnabled(true),
m_isOverlayPaintingEnabled(true)
m_isOverlayPaintingEnabled(true),
m_offscreenViewportWidth(0),
m_offscreenViewportHeight(0)
{
m_layoutWidget = parentWidget();
@ -497,6 +499,9 @@ void caf::Viewer::resizeGL(int width, int height)
m_offscreenFbo->resizeAttachedBuffers(width, height);
m_quadRendering->camera()->viewport()->set(0, 0, width, height);
m_offscreenViewportWidth = width;
m_offscreenViewportHeight = height;
}
updateCamera(width, height);
@ -810,9 +815,30 @@ bool caf::Viewer::isShadersSupported()
QImage caf::Viewer::snapshotImage()
{
QImage image;
if (m_offscreenTexture.notNull() && m_offscreenTexture->image())
if (m_offscreenFbo.notNull() && m_offscreenViewportWidth > 0 && m_offscreenViewportHeight > 0)
{
image = cvfqt::Utils::toQImage(*(m_offscreenTexture->image()));
cvf::ref<cvf::OpenGLContext> myOglContext = cvfOpenGLContext();
// TODO: Is this required???
//m_offscreenFbo->bind(myOglContext.p());
GLint iOldPackAlignment = 0;
glGetIntegerv(GL_PACK_ALIGNMENT, &iOldPackAlignment);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
CVF_CHECK_OGL(myOglContext.p());
cvf::UByteArray arr(3 * m_offscreenViewportWidth * m_offscreenViewportHeight);
glReadPixels(0, 0, static_cast<GLsizei>(m_offscreenViewportWidth), static_cast<GLsizei>(m_offscreenViewportHeight), GL_RGB, GL_UNSIGNED_BYTE, arr.ptr());
CVF_CHECK_OGL(myOglContext.p());
glPixelStorei(GL_PACK_ALIGNMENT, iOldPackAlignment);
CVF_CHECK_OGL(myOglContext.p());
cvf::TextureImage texImage;
texImage.setFromRgb(arr.ptr(), m_offscreenViewportWidth, m_offscreenViewportHeight);
image = cvfqt::Utils::toQImage(texImage);
}
else
{

2
Fwk/AppFwk/cafViewer/cafViewer.h
View File

@ -231,6 +231,8 @@ private:
// Offscreen render objects
cvf::ref<cvf::FramebufferObject> m_offscreenFbo;
cvf::ref<cvf::Texture> m_offscreenTexture;
int m_offscreenViewportWidth;
int m_offscreenViewportHeight;
cvf::ref<cvf::Rendering> m_quadRendering;
};