/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#include <opengl/x11/cairotextrender.hxx>

#include <opengl/gdiimpl.hxx>

#include <cairo.h>

OpenGLX11CairoTextRender::OpenGLX11CairoTextRender(X11SalGraphics& rParent)
    : X11CairoTextRender(rParent)
{
}

cairo_t* OpenGLX11CairoTextRender::getCairoContext()
{
    cairo_surface_t* surface = nullptr;
    OpenGLSalGraphicsImpl *pImpl = dynamic_cast< OpenGLSalGraphicsImpl* >(mrParent.GetImpl());
    if( pImpl )
    {
        tools::Rectangle aClipRect = pImpl->getClipRegion().GetBoundRect();
        if( aClipRect.GetWidth() == 0 || aClipRect.GetHeight() == 0 )
        {
            aClipRect.setWidth( GetWidth() );
            aClipRect.setHeight( GetHeight() );
        }
        surface = cairo_image_surface_create( CAIRO_FORMAT_ARGB32, aClipRect.GetWidth(), aClipRect.GetHeight() );
    }
    if (!surface)
        return nullptr;
    cairo_t *cr = cairo_create(surface);
    cairo_surface_destroy(surface);
    return cr;
}

void OpenGLX11CairoTextRender::getSurfaceOffset( double& nDX, double& nDY )
{
    OpenGLSalGraphicsImpl *pImpl = dynamic_cast< OpenGLSalGraphicsImpl* >(mrParent.GetImpl());
    if( pImpl )
    {
        tools::Rectangle aClipRect = pImpl->getClipRegion().GetBoundRect();
        nDX = -aClipRect.Left();
        nDY = -aClipRect.Top();
    }
}

void OpenGLX11CairoTextRender::releaseCairoContext(cairo_t* cr)
{
    // XXX: lfrb: GLES 2.0 doesn't support GL_UNSIGNED_INT_8_8_8_8_REV
    OpenGLSalGraphicsImpl *pImpl = dynamic_cast< OpenGLSalGraphicsImpl* >(mrParent.GetImpl());
    if(!pImpl)
    {
        cairo_destroy(cr);
        return;
    }

    cairo_surface_t* pSurface = cairo_get_target(cr);
    int nWidth = cairo_image_surface_get_width( pSurface );
    int nHeight = cairo_image_surface_get_height( pSurface );
    cairo_surface_flush(pSurface);
    unsigned char *pSrc = cairo_image_surface_get_data( pSurface );

    // XXX: lfrb: GLES 2.0 doesn't support GL_UNSIGNED_INT_8_8_8_8_REV
    tools::Rectangle aClipRect = pImpl->getClipRegion().GetBoundRect();

    SalTwoRect aRect(0, 0, nWidth, nHeight,
            aClipRect.Left(), aClipRect.Top(), nWidth, nHeight);

    // Cairo surface data is ARGB with premultiplied alpha and is Y-inverted
    OpenGLTexture aTexture( nWidth, nHeight, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, pSrc );
    pImpl->PreDraw();
    pImpl->DrawAlphaTexture( aTexture, aRect, true, true );
    pImpl->PostDraw();

    cairo_destroy(cr);
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */