wincursor.cpp

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/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * 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 "common/ptr.h"
#include "common/stream.h"
#include "common/textconsole.h"

#include "graphics/wincursor.h"

namespace Graphics {

class WinCursor : public Cursor {
public:
    WinCursor();
    ~WinCursor();

    uint16 getWidth() const;
    uint16 getHeight() const;
    uint16 getHotspotX() const;
    uint16 getHotspotY() const;
    byte getKeyColor() const;

    const byte *getSurface() const { return _surface; }

    const byte *getPalette() const { return _palette; }
    byte getPaletteStartIndex() const { return 0; }
    uint16 getPaletteCount() const { return 256; }

    bool readFromStream(Common::SeekableReadStream &stream);

private:
    byte *_surface;
    byte _palette[256 * 3];

    uint16 _width;    
    uint16 _height;   
    uint16 _hotspotX; 
    uint16 _hotspotY; 
    byte   _keyColor; 

    void clear();
};

WinCursor::WinCursor() {
    _width    = 0;
    _height   = 0;
    _hotspotX = 0;
    _hotspotY = 0;
    _surface  = 0;
    _keyColor = 0;
    memset(_palette, 0, 256 * 3);
}

WinCursor::~WinCursor() {
    clear();
}

uint16 WinCursor::getWidth() const {
    return _width;
}

uint16 WinCursor::getHeight() const {
    return _height;
}

uint16 WinCursor::getHotspotX() const {
    return _hotspotX;
}

uint16 WinCursor::getHotspotY() const {
    return _hotspotY;
}

byte WinCursor::getKeyColor() const {
    return _keyColor;
}

bool WinCursor::readFromStream(Common::SeekableReadStream &stream) {
    clear();

    _hotspotX = stream.readUint16LE();
    _hotspotY = stream.readUint16LE();

    // Check header size
    if (stream.readUint32LE() != 40)
        return false;

    // Check dimensions
    _width = stream.readUint32LE();
    _height = stream.readUint32LE() / 2;

    if (_width & 3) {
        // Cursors should always be a power of 2
        // Of course, it wouldn't be hard to handle but if we have no examples...
        warning("Non-divisible-by-4 width cursor found");
        return false;
    }

    // Color planes
    if (stream.readUint16LE() != 1)
        return false;

    // Only 1bpp and 8bpp supported
    uint16 bitsPerPixel = stream.readUint16LE();
    if (bitsPerPixel != 1 && bitsPerPixel != 8)
        return false;

    // Compression
    if (stream.readUint32LE() != 0)
        return false;

    // Image size + X resolution + Y resolution
    stream.skip(12);

    uint32 numColors = stream.readUint32LE();

    // If the color count is 0, then it uses up the maximum amount
    if (numColors == 0)
        numColors = 1 << bitsPerPixel;

    // Reading the palette
    stream.seek(40 + 4);
    for (uint32 i = 0 ; i < numColors; i++) {
        _palette[i * 3 + 2] = stream.readByte();
        _palette[i * 3 + 1] = stream.readByte();
        _palette[i * 3    ] = stream.readByte();
        stream.readByte();
    }

    // Reading the bitmap data
    uint32 dataSize = stream.size() - stream.pos();
    byte *initialSource = new byte[dataSize];
    stream.read(initialSource, dataSize);

    // Parse the XOR map
    const byte *src = initialSource;
    _surface = new byte[_width * _height];
    byte *dest = _surface + _width * (_height - 1);
    uint32 imagePitch = _width * bitsPerPixel / 8;

    for (uint32 i = 0; i < _height; i++) {
        byte *rowDest = dest;

        if (bitsPerPixel == 1) {
            // 1bpp
            for (uint16 j = 0; j < (_width / 8); j++) {
                byte p = src[j];

                for (int k = 0; k < 8; k++, rowDest++, p <<= 1) {
                    if ((p & 0x80) == 0x80)
                        *rowDest = 1;
                    else
                        *rowDest = 0;
                }
            }
        } else {
            // 8bpp
            memcpy(rowDest, src, _width);
        }

        dest -= _width;
        src += imagePitch;
    }

    // Calculate our key color
    if (numColors < 256) {
        // If we're not using the maximum colors in a byte, we can fit it in
        _keyColor = numColors;
    } else {
        // HACK: Try to find a color that's not being used so it can become
        // our keycolor. It's quite impossible to fit 257 entries into 256...
        for (uint32 i = 0; i < 256; i++) {
            for (int j = 0; j < _width * _height; j++) {
                // TODO: Also check to see if the space is transparent

                if (_surface[j] == i)
                    break;

                if (j == _width * _height - 1) {
                    _keyColor = i;
                    i = 256;
                    break;
                }
            }
        }
    }

    // Now go through and apply the AND map to get the transparency
    uint32 andWidth = (_width + 7) / 8;
    src += andWidth * (_height - 1);

    for (uint32 y = 0; y < _height; y++) {
        for (uint32 x = 0; x < _width; x++)
            if (src[x / 8] & (1 << (7 - x % 8)))
                _surface[y * _width + x] = _keyColor;

        src -= andWidth;
    }

    delete[] initialSource;
    return true;
}

void WinCursor::clear() {
    delete[] _surface; _surface = 0;
}

WinCursorGroup::WinCursorGroup() {
}

WinCursorGroup::~WinCursorGroup() {
    for (uint32 i = 0; i < cursors.size(); i++)
        delete cursors[i].cursor;
}

WinCursorGroup *WinCursorGroup::createCursorGroup(Common::WinResources *exe, const Common::WinResourceID &id) {
    Common::ScopedPtr<Common::SeekableReadStream> stream(exe->getResource(Common::kWinGroupCursor, id));

    if (!stream || stream->size() <= 6)
        return 0;

    stream->skip(4);
    uint32 cursorCount = stream->readUint16LE();
    if ((uint32)stream->size() < (6 + cursorCount * 14))
        return 0;

    WinCursorGroup *group = new WinCursorGroup();
    group->cursors.reserve(cursorCount);

    for (uint32 i = 0; i < cursorCount; i++) {
        stream->readUint16LE(); // width
        stream->readUint16LE(); // height

        // Plane count
        if (stream->readUint16LE() != 1) {
            warning("PlaneCount is not 1.");
        }

        stream->readUint16LE(); // bits per pixel
        stream->readUint32LE(); // data size
        uint32 cursorId = stream->readUint16LE();

        Common::ScopedPtr<Common::SeekableReadStream> cursorStream(exe->getResource(Common::kWinCursor, cursorId));
        if (!cursorStream) {
            delete group;
            return 0;
        }

        WinCursor *cursor = new WinCursor();
        if (!cursor->readFromStream(*cursorStream)) {
            delete cursor;
            delete group;
            return 0;
        }

        CursorItem item;
        item.id = cursorId;
        item.cursor = cursor;
        group->cursors.push_back(item);
    }

    return group;
}

class DefaultWinCursor : public Cursor {
public:
    DefaultWinCursor() {}
    ~DefaultWinCursor() {}

    uint16 getWidth() const { return 12; }
    uint16 getHeight() const { return 20; }
    uint16 getHotspotX() const { return 0; }
    uint16 getHotspotY() const { return 0; }
    byte getKeyColor() const { return 0; }

    const byte *getSurface() const {
        static const byte defaultCursor[] = {
            1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            1, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            1, 2, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0,
            1, 2, 2, 2, 1, 0, 0, 0, 0, 0, 0, 0,
            1, 2, 2, 2, 2, 1, 0, 0, 0, 0, 0, 0,
            1, 2, 2, 2, 2, 2, 1, 0, 0, 0, 0, 0,
            1, 2, 2, 2, 2, 2, 2, 1, 0, 0, 0, 0,
            1, 2, 2, 2, 2, 2, 2, 2, 1, 0, 0, 0,
            1, 2, 2, 2, 2, 2, 2, 2, 2, 1, 0, 0,
            1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 0,
            1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1,
            1, 2, 2, 2, 1, 2, 2, 1, 0, 0, 0, 0,
            1, 2, 2, 1, 1, 2, 2, 1, 0, 0, 0, 0,
            1, 2, 1, 0, 1, 1, 2, 2, 1, 0, 0, 0,
            1, 1, 0, 0, 0, 1, 2, 2, 1, 0, 0, 0,
            1, 0, 0, 0, 0, 0, 1, 2, 2, 1, 0, 0,
            0, 0, 0, 0, 0, 0, 1, 2, 2, 1, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 1, 2, 2, 1, 0,
            0, 0, 0, 0, 0, 0, 0, 1, 2, 2, 1, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0
        };

        return defaultCursor;
    }

    const byte *getPalette() const {
        static const byte bwPalette[] = {
            0x00, 0x00, 0x00,   // Black
            0xFF, 0xFF, 0xFF    // White
        };

        return bwPalette;
    }
    byte getPaletteStartIndex() const { return 1; }
    uint16 getPaletteCount() const { return 2; }
};

Cursor *makeDefaultWinCursor() {
    return new DefaultWinCursor();
}

} // End of namespace Graphics