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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include <QDebug>
#include "qopenvgoffscreensurface.h"
#include <QtGui/QImage>
QT_BEGIN_NAMESPACE
QOpenVGOffscreenSurface::QOpenVGOffscreenSurface(const QSize &size)
: m_size(size)
{
m_display = eglGetCurrentDisplay();
m_image = vgCreateImage(VG_sARGB_8888_PRE, m_size.width(), m_size.height(), VG_IMAGE_QUALITY_BETTER);
const EGLint configAttribs[] = {
EGL_CONFORMANT, EGL_OPENVG_BIT,
EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
EGL_RED_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_ALPHA_SIZE, 8,
EGL_ALPHA_MASK_SIZE, 8,
EGL_NONE
};
EGLConfig pbufferConfig;
EGLint numConfig;
eglChooseConfig(m_display, configAttribs, &pbufferConfig, 1, &numConfig);
m_context = eglCreateContext(m_display, pbufferConfig, eglGetCurrentContext(), 0);
if (m_context == EGL_NO_CONTEXT)
qWarning("QOpenVGOffscreenSurface: failed to create EGLContext");
m_renderTarget = eglCreatePbufferFromClientBuffer(m_display,
EGL_OPENVG_IMAGE,
reinterpret_cast<EGLClientBuffer>(uintptr_t(m_image)),
pbufferConfig,
0);
if (m_renderTarget == EGL_NO_SURFACE)
qWarning("QOpenVGOffscreenSurface: failed to create EGLSurface from VGImage");
}
QOpenVGOffscreenSurface::~QOpenVGOffscreenSurface()
{
vgDestroyImage(m_image);
eglDestroySurface(m_display, m_renderTarget);
eglDestroyContext(m_display, m_context);
}
void QOpenVGOffscreenSurface::makeCurrent()
{
EGLContext currentContext = eglGetCurrentContext();
if (m_context != currentContext) {
m_previousContext = eglGetCurrentContext();
m_previousReadSurface = eglGetCurrentSurface(EGL_READ);
m_previousDrawSurface = eglGetCurrentSurface(EGL_DRAW);
eglMakeCurrent(m_display, m_renderTarget, m_renderTarget, m_context);
}
}
void QOpenVGOffscreenSurface::doneCurrent()
{
EGLContext currentContext = eglGetCurrentContext();
if (m_context == currentContext) {
eglMakeCurrent(m_display, m_previousDrawSurface, m_previousReadSurface, m_previousContext);
m_previousContext = EGL_NO_CONTEXT;
m_previousReadSurface = EGL_NO_SURFACE;
m_previousDrawSurface = EGL_NO_SURFACE;
}
}
void QOpenVGOffscreenSurface::swapBuffers()
{
eglSwapBuffers(m_display, m_renderTarget);
}
QImage QOpenVGOffscreenSurface::readbackQImage()
{
QImage readbackImage(m_size, QImage::Format_ARGB32_Premultiplied);
vgGetImageSubData(m_image, readbackImage.bits(), readbackImage.bytesPerLine(), VG_sARGB_8888_PRE, 0, 0, m_size.width(), m_size.height());
return readbackImage;
}
QT_END_NAMESPACE
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