windowscreencastsource.cpp

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/*
    SPDX-FileCopyrightText: 2021 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
 
#include "windowscreencastsource.h"
#include "screencastutils.h"
 
#include "compositor.h"
#include "core/output.h"
#include "core/renderloop.h"
#include "core/rendertarget.h"
#include "core/renderviewport.h"
#include "effect/effect.h"
#include "opengl/gltexture.h"
#include "opengl/glutils.h"
#include "scene/itemrenderer.h"
#include "scene/windowitem.h"
#include "scene/workspacescene.h"
#include <drm_fourcc.h>
 
namespace KWin
{
 
WindowScreenCastSource::WindowScreenCastSource(Window *window, QObject *parent)
    : ScreenCastSource(parent)
    , m_window(window)
    , m_offscreenRef(window)
{
    connect(m_window, &Window::closed, this, &ScreenCastSource::closed);
}
 
quint32 WindowScreenCastSource::drmFormat() const
{
    return DRM_FORMAT_ARGB8888;
}
 
bool WindowScreenCastSource::hasAlphaChannel() const
{
    return true;
}
 
QSize WindowScreenCastSource::textureSize() const
{
    return m_window->clientGeometry().size().toSize();
}
 
void WindowScreenCastSource::render(spa_data *spa, spa_video_format format)
{
    const auto offscreenTexture = GLTexture::allocate(hasAlphaChannel() ? GL_RGBA8 : GL_RGB8, textureSize());
    if (!offscreenTexture) {
        return;
    }
    offscreenTexture->setContentTransform(OutputTransform::FlipY);
 
    GLFramebuffer offscreenTarget(offscreenTexture.get());
    render(&offscreenTarget);
    grabTexture(offscreenTexture.get(), spa, format);
}
 
void WindowScreenCastSource::render(GLFramebuffer *target)
{
    RenderTarget renderTarget(target);
    RenderViewport viewport(m_window->clientGeometry(), 1, renderTarget);
 
    WindowPaintData data;
    data.setProjectionMatrix(viewport.projectionMatrix());
 
    GLFramebuffer::pushFramebuffer(target);
    glClearColor(0.0, 0.0, 0.0, 0.0);
    glClear(GL_COLOR_BUFFER_BIT);
    Compositor::self()->scene()->renderer()->renderItem(renderTarget, viewport, m_window->windowItem(), Scene::PAINT_WINDOW_TRANSFORMED, infiniteRegion(), data);
    GLFramebuffer::popFramebuffer();
}
 
std::chrono::nanoseconds WindowScreenCastSource::clock() const
{
    return m_window->output()->renderLoop()->lastPresentationTimestamp();
}
 
uint WindowScreenCastSource::refreshRate() const
{
    return m_window->output()->refreshRate();
}
 
} // namespace KWin
 
#include "moc_windowscreencastsource.cpp"