resources/image.cpp

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/* ResidualVM - A 3D game interpreter
 *
 * ResidualVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the AUTHORS
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#include "engines/stark/resources/image.h"

#include "common/debug.h"
#include "image/png.h"

#include "engines/stark/debug.h"
#include "engines/stark/formats/xrc.h"
#include "engines/stark/services/archiveloader.h"
#include "engines/stark/services/settings.h"
#include "engines/stark/services/services.h"
#include "engines/stark/visual/effects/bubbles.h"
#include "engines/stark/visual/effects/fireflies.h"
#include "engines/stark/visual/effects/fish.h"
#include "engines/stark/visual/image.h"
#include "engines/stark/visual/text.h"

#include "math/line2d.h"
#include "math/vector2d.h"

namespace Stark {
namespace Resources {

Object *Image::construct(Object *parent, byte subType, uint16 index, const Common::String &name) {
    switch (subType) {
    case kImageSub2:
    case kImageSub3:
        return new ImageStill(parent, subType, index, name);
    case kImageSub4:
        return new ImageText(parent, subType, index, name);
    default:
        error("Unknown image subtype %d", subType);
    }
}

Image::~Image() {
    delete _visual;
}

Image::Image(Object *parent, byte subType, uint16 index, const Common::String &name) :
        Object(parent, subType, index, name),
        _transparent(false),
        _transparentColor(0),
        _field_44_ADF(0),
        _field_48_ADF(30),
        _visual(nullptr) {
    _type = TYPE;
}

void Image::readData(Formats::XRCReadStream *stream) {
    _filename = stream->readString();
    _hotspot = stream->readPoint();
    _transparent = stream->readBool();
    _transparentColor = stream->readUint32LE();

    uint32 polygonCount = stream->readUint32LE();
    for (uint32 i = 0; i < polygonCount; i++) {
        Polygon polygon;

        uint32 pointCount = stream->readUint32LE();
        for (uint32 j = 0; j < pointCount; j++) {
            polygon.push_back(stream->readPoint());
        }

        _polygons.push_back(polygon);
    }

    _archiveName = stream->getArchiveName();
}

Visual *Image::getVisual() {
    initVisual();
    return _visual;
}

void Image::printData() {
    debug("filename: %s", _filename.c_str());
    debug("hotspot: x %d, y %d", _hotspot.x, _hotspot.y);
    debug("transparent: %d", _transparent);
    debug("transparentColor: %d", _transparentColor);
    debug("field_44: %d", _field_44_ADF);
    debug("field_48: %d", _field_48_ADF);

    for (uint32 i = 0; i < _polygons.size(); i++) {
        Common::String description;
        for (uint32 j = 0; j < _polygons[i].size(); j++) {
            description += Common::String::format("(x %d, y %d) ", _polygons[i][j].x, _polygons[i][j].y);
        }
        debug("polygon %d: %s", i, description.c_str());
    }
}

int Image::indexForPoint(const Common::Point &point) const {
    int index = -1;
    for (uint32 i = 0; i < _polygons.size(); i++) {
        if (isPointInPolygon(_polygons[i], point)) {
            index = i;
        }
    }

    return index;
}

bool Image::isPointInPolygon(const Polygon &polygon, const Common::Point &point) const {
    if (polygon.size() <= 1) {
        return false; // Empty polygon
    }

    // A ray cast from the point
    Math::Segment2d testLine(Math::Vector2d(point.x, point.y), Math::Vector2d(-100, -100));

    // Special case the line created between the last point and the first
    Math::Vector2d prevPoint = Math::Vector2d(polygon.back().x, polygon.back().y);

    // Count the intersections of the ray with the polygon's edges
    int intersectCount = 0;
    for (uint32 j = 0; j < polygon.size(); j++) {
        Math::Vector2d curPoint = Math::Vector2d(polygon[j].x, polygon[j].y);

        if (Math::Segment2d(prevPoint, curPoint).intersectsSegment(testLine, nullptr)) {
            intersectCount++;
        }

        prevPoint = curPoint;
    }

    // If the ray crosses the polygon an odd number of times, the point is inside the polygon
    return intersectCount % 2 != 0;
}

Common::Point Image::getHotspotPosition(uint index) const {
    if (index >= _polygons.size()) {
        return Common::Point(-1, -1);
    }

    Polygon polygon = _polygons[index];

    // Return the top-middle point as the hotspot
    int right = polygon[0].x, top = polygon[0].y;

    for (uint i = 1; i < polygon.size(); ++i) {
        right += polygon[i].x;
        if (polygon[i].y < top) {
            top = polygon[i].y;
        }
    }

    right /= polygon.size();
    
    if (top < 0) {
        top = 0;
    }

    return Common::Point(right, top);
}

ImageStill::~ImageStill() {
}

ImageStill::ImageStill(Object *parent, byte subType, uint16 index, const Common::String &name) :
        Image(parent, subType, index, name),
        _noName(false) {
}

void ImageStill::readData(Formats::XRCReadStream *stream) {
    Image::readData(stream);

    if (stream->isDataLeft()) {
        _field_44_ADF = stream->readUint32LE();
        _field_44_ADF /= 33;
    }

    if (stream->isDataLeft()) {
        _field_48_ADF = stream->readUint32LE();
    }

    _noName = _filename == "noname" || _filename == "noname.xmg";
}

void ImageStill::onPostRead() {
    initVisual();
}

void ImageStill::initVisual() {
    if (_visual) {
        return; // The visual is already there
    }

    if (_noName) {
        return; // No file to load
    }

    Common::ReadStream *xmgStream = StarkArchiveLoader->getFile(_filename, _archiveName);

    VisualImageXMG *visual = new VisualImageXMG(StarkGfx);

    if (StarkSettings->isAssetsModEnabled() && loadPNGOverride(visual)) {
        visual->readOriginalSize(xmgStream);
    } else {
        visual->load(xmgStream);
    }

    visual->setHotSpot(_hotspot);

    _visual = visual;

    delete xmgStream;
}

bool ImageStill::loadPNGOverride(VisualImageXMG *visual) const {
    if (!_filename.hasSuffixIgnoreCase(".xmg")) {
        return false;
    }

    Common::String pngFilename = Common::String(_filename.c_str(), _filename.size() - 4) + ".png";
    Common::String pngFilePath = StarkArchiveLoader->getExternalFilePath(pngFilename, _archiveName);

    debugC(kDebugModding, "Attempting to load %s", pngFilePath.c_str());

    Common::SeekableReadStream *pngStream = SearchMan.createReadStreamForMember(pngFilePath);
    if (!pngStream) {
        return false;
    }

    if (!visual->loadPNG(pngStream)) {
        warning("Failed to load %s. It is not a valid PNG file.", pngFilePath.c_str());
        delete pngStream;
        return false;
    }

    debugC(kDebugModding, "Loaded %s", pngFilePath.c_str());

    delete pngStream;
    return true;
}

void ImageStill::printData() {
    Image::printData();
}

ImageText::ImageText(Object *parent, byte subType, uint16 index, const Common::String &name) :
        Image(parent, subType, index, name),
        _color(Color(0, 0, 0)),
        _font(0) {
}

ImageText::~ImageText() {
}

void ImageText::readData(Formats::XRCReadStream *stream) {
    Image::readData(stream);

    _size = stream->readPoint();
    _text = stream->readString();
    _color.r = stream->readByte();
    _color.g = stream->readByte();
    _color.b = stream->readByte();
    _color.a = stream->readByte() | 0xFF;
    _font = stream->readUint32LE();
}

void ImageText::initVisual() {
    if (_visual) {
        return; // The visual is already there
    }

    if (_text.hasPrefix("GFX_Bubbles")) {
        VisualEffectBubbles *bubbles = new VisualEffectBubbles(StarkGfx, _size);
        bubbles->setParams(_text);
        _visual = bubbles;
    } else if (_text.hasPrefix("GFX_FireFlies")) {
        VisualEffectFireFlies *fireFlies = new VisualEffectFireFlies(StarkGfx, _size);
        fireFlies->setParams(_text);
        _visual = fireFlies;
    } else if (_text.hasPrefix("GFX_Fish")) {
        VisualEffectFish *fish = new VisualEffectFish(StarkGfx, _size);
        fish->setParams(_text);
        _visual = fish;
    } else if (_text.hasPrefix("GFX_")) {
        error("Unknown effect '%s'", _text.c_str());
    } else {
        VisualText *text = new VisualText(StarkGfx);
        text->setText(_text);
        text->setColor(_color);
        text->setTargetWidth(_size.x);
        text->setTargetHeight(_size.y);
        text->setFont(FontProvider::kCustomFont, _font);
        _visual = text;
    }
}

void ImageText::printData() {
    Image::printData();

    debug("size: x %d, y %d", _size.x, _size.y);
    debug("text: %s", _text.c_str());
    debug("color: (%d, %d, %d, %d)", _color.r, _color.g, _color.b, _color.a);
    debug("font: %d", _font);
}

} // End of namespace Resources
} // End of namespace Stark