/******************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Quick Ultralite module.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
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** $QT_END_LICENSE$
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******************************************************************************/
#include "imagewithopacitymask.h"

#include <qul/image.h>
#include <platform/platform.h>

#include <cstring>
#include <memory>

#ifdef QUL_TVIIC_PLATFORM
#include <sm_util.h>
#include <pe_matrix.h>
#include "cygfx.h"
#else
#include <QImage>
#include <QPainter>
#include <QVector>
#include "desktop.h"
#endif

#include <qul/private/unicodestring.h>
#include <qul/private/image_p.h>

#include <platforminterface/log.h>

static Qul::PlatformInterface::Texture textureFromSharedImage(const Qul::SharedImage &image)
{
    const Qul::Private::RasterBuffer *buffer = Qul::Private::ImagePrivate::rasterBuffer(image);
    assert(buffer->textureCount == 1);
    const Qul::Private::Texture *texture = buffer->begin();
    return texture->platformTexture();
}

Qul::PlatformInterface::Rect ImageWithOpacityMaskDelegate::boundingRect(Qul::PlatformInterface::Size) const
{
    auto texture = textureFromSharedImage(source.value());
    return Qul::PlatformInterface::Rect(0, 0, texture.width(), texture.height());
}

void ImageWithOpacityMaskDelegate::paint(Qul::PlatformInterface::DrawingDevice *device,
                                         const Qul::PlatformInterface::Rect &clip,
                                         const Qul::PlatformInterface::Transform &transform,
                                         Qul::PlatformInterface::Size,
                                         float opacity) const
{
    auto texture = textureFromSharedImage(source.value());
    auto maskTexture = textureFromSharedImage(mask.value());

    if (!m_initialized) {
#ifdef QUL_TVIIC_PLATFORM
        CyGfx::loadSurface(&m_source, texture);
        CyGfx::loadSurface(&m_mask, maskTexture);
#endif
        m_initialized = true;
    }

#ifdef QUL_TVIIC_PLATFORM
    void **platformContext = static_cast<void **>(device->platformContext());
    CYGFX_BE_CONTEXT ctx = static_cast<CYGFX_BE_CONTEXT>(platformContext[0]);
    CYGFX_SURFACE surface = static_cast<CYGFX_SURFACE>(platformContext[1]);
    CYGFX_BE_CONTEXT drawCtx = static_cast<CYGFX_BE_CONTEXT>(platformContext[2]);

    CYGFX_ERROR ret = CYGFX_OK;
    CYGFX_U32 renderMode;
    UTIL_SUCCESS(ret, CyGfx_BeGetAttribute(ctx, CYGFX_BE_CTX_ATTR_RENDER_MODE, &renderMode));
    if (renderMode == CYGFX_BE_RENDER_MODE_IBO) {
        Qul::PlatformInterface::log("ImageWithOpacityMaskDelegate doesn't support IBO layers\n");
        return;
    }

    Mat3x3 matrix{transform.m11(),
                  transform.m12(),
                  transform.m13(),
                  transform.m21(),
                  transform.m22(),
                  transform.m23(),
                  transform.dx(),
                  transform.dy(),
                  transform.m33()};

    bool hasClipping = false;
    if (clip != Qul::PlatformInterface::Rect(0, 0, device->width(), device->height())) {
        // Blend only in clip area
        UTIL_SUCCESS(ret,
                     CyGfx_BeSetSurfAttribute(ctx, CYGFX_BE_TARGET_STORE, CYGFX_BE_SURF_ATTR_USE_CLIPPING, CYGFX_TRUE));
        UTIL_SUCCESS(ret,
                     CyGfx_BeActiveArea(ctx, CYGFX_BE_TARGET_STORE, clip.x(), clip.y(), clip.width(), clip.height()));
    }

    CYGFX_SURFACE transformedMask = CYGFX_BE_SURF_MASK_ALPHA;

    UTIL_SUCCESS(ret, CyGfx_BeBindSurface(ctx, CYGFX_BE_TARGET_SRC, m_mask));
    UTIL_SUCCESS(ret, CyGfx_BeBindSurface(ctx, CYGFX_BE_TARGET_STORE, transformedMask));
    UTIL_SUCCESS(ret, CyGfx_BeBindSurface(ctx, CYGFX_BE_TARGET_DST, 0));
    UTIL_SUCCESS(ret, CyGfx_BeSetGeoMatrix(ctx, CYGFX_BE_TARGET_SRC, CYGFX_BE_GEO_MATRIX_FORMAT_3X3, matrix));
    UTIL_SUCCESS(ret, CyGfx_BeBlt(ctx, 0, 0));
    UTIL_SUCCESS(ret, CyGfx_BeBindSurface(ctx, CYGFX_BE_TARGET_STORE | CYGFX_BE_TARGET_DST, surface));

    UTIL_SUCCESS(ret, CyGfx_BeBindSurface(ctx, CYGFX_BE_TARGET_SRC, m_source));
    if (opacity != 1) {
        UTIL_SUCCESS(ret,
                     CyGfx_BeSetSurfAttribute(ctx,
                                              CYGFX_BE_TARGET_SRC,
                                              CYGFX_BE_SURF_ATTR_COLOR,
                                              CYGFX_SM_COLOR_TO_RGBA(255, 255, 255, int(255 * opacity))));
        UTIL_SUCCESS(ret, CyGfx_BeSetSurfAttribute(ctx, CYGFX_BE_TARGET_SRC, CYGFX_BE_SURF_ATTR_ALPHAMULTI, CYGFX_TRUE));
    }

    UTIL_SUCCESS(ret, CyGfx_BeSetGeoMatrix(ctx, CYGFX_BE_TARGET_SRC, CYGFX_BE_GEO_MATRIX_FORMAT_3X3, matrix));
    UTIL_SUCCESS(ret, CyGfx_BeBindSurface(ctx, CYGFX_BE_TARGET_MASK, transformedMask));
    UTIL_SUCCESS(ret, CyGfx_BeBlt(ctx, 0, 0));

    UTIL_SUCCESS(ret, CyGfx_BeBindSurface(ctx, CYGFX_BE_TARGET_MASK, nullptr));

    if (hasClipping)
        UTIL_SUCCESS(ret,
                     CyGfx_BeSetSurfAttribute(ctx, CYGFX_BE_TARGET_STORE, CYGFX_BE_SURF_ATTR_USE_CLIPPING, CYGFX_FALSE));
#else
    QPainter *p = static_cast<QPainter *>(device->platformContext());

    QImage image(texture.data(),
                 texture.width(),
                 texture.height(),
                 texture.bytesPerLine(),
                 toQImageFormat(texture.format()));
    QImage maskImage(maskTexture.data(),
                     maskTexture.width(),
                     maskTexture.height(),
                     maskTexture.bytesPerLine(),
                     toQImageFormat(maskTexture.format()));

    QImage withMask = image.convertToFormat(QImage::Format_ARGB32_Premultiplied);
    QPainter imagePainter(&withMask);
    imagePainter.setCompositionMode(QPainter::CompositionMode_DestinationIn);
    imagePainter.drawImage(0, 0, maskImage);
    imagePainter.end();

    p->save();
    p->setClipRect(QRect(clip.x(), clip.y(), clip.width(), clip.height()));
    p->setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
    p->setTransform(toQTransform(transform));
    p->setOpacity(opacity);
    p->drawImage(QPoint(), withMask);
    p->restore();
#endif
}