util.h

/* 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef MUTATIONOFJB_UTIL_H
#define MUTATIONOFJB_UTIL_H

#include "common/rect.h"

#include "graphics/managed_surface.h"
#include "graphics/surface.h"

namespace Common {
class String;
}

namespace MutationOfJB {

void reportFileMissingError(const char *fileName);
Common::String toUpperCP895(const Common::String &str);

// Taken from ManagedSurface::clip.
template<typename SurfaceType>
bool clipBounds(Common::Rect &srcBounds, Common::Rect &destBounds, SurfaceType &destSurf) {
    if (destBounds.left >= destSurf.w || destBounds.top >= destSurf.h ||
            destBounds.right <= 0 || destBounds.bottom <= 0)
        return false;

    // Clip the bounds if source is too big to fit into destination.
    if (destBounds.right > destSurf.w) {
        srcBounds.right -= destBounds.right - destSurf.w;
        destBounds.right = destSurf.w;
    }

    if (destBounds.bottom > destSurf.h) {
        srcBounds.bottom -= destBounds.bottom - destSurf.h;
        destBounds.bottom = destSurf.h;
    }

    if (destBounds.top < 0) {
        srcBounds.top += -destBounds.top;
        destBounds.top = 0;
    }

    if (destBounds.left < 0) {
        srcBounds.left += -destBounds.left;
        destBounds.left = 0;
    }

    return true;
}

template<typename BlitOp>
void blit_if(const Graphics::Surface &src, const Common::Rect &srcRect, Graphics::Surface &dest, const Common::Point &destPos, BlitOp blitOp) {
    Common::Rect srcBounds = srcRect;
    Common::Rect destBounds(destPos.x, destPos.y, destPos.x + srcRect.width(), destPos.y + srcRect.height());

    assert(srcRect.isValidRect());
    assert(dest.format == src.format);

    if (!clipBounds(srcBounds, destBounds, dest))
        return;

    for (int y = 0; y < srcBounds.height(); ++y) {
        const byte *srcP = reinterpret_cast<const byte *>(src.getBasePtr(srcBounds.left, srcBounds.top + y));
        const byte *srcEndP = srcP + srcBounds.width();
        byte *destP = reinterpret_cast<byte *>(dest.getBasePtr(destBounds.left, destBounds.top + y));

        while (srcP != srcEndP) {
            const byte newColor = blitOp(*srcP, *destP);
            if (*destP != newColor) {
                *destP = newColor;
            }
            ++srcP;
            ++destP;
        }
    }
}

template<typename BlitOp>
void blit_if(const Graphics::Surface &src, const Common::Rect &srcRect, Graphics::ManagedSurface &dest, const Common::Point &destPos, BlitOp blitOp) {
    Common::Rect srcBounds = srcRect;
    Common::Rect destBounds(destPos.x, destPos.y, destPos.x + srcRect.width(), destPos.y + srcRect.height());

    assert(srcRect.isValidRect());
    assert(dest.format == src.format);

    if (!clipBounds(srcBounds, destBounds, dest))
        return;

    Graphics::Surface destSurf = dest.getSubArea(destBounds); // This will invalidate the rectangle.
    blit_if(src, srcRect, destSurf, Common::Point(0, 0), blitOp);
}

template<typename BlitOp>
void blit_if(const Graphics::Surface &src, Graphics::Surface &dest, const Common::Point &destPos, BlitOp blitOp) {
    blit_if(src, Common::Rect(0, 0, src.w, src.h), dest, destPos, blitOp);
}

template<typename BlitOp>
void blit_if(const Graphics::Surface &src, Graphics::ManagedSurface &dest, const Common::Point &destPos, BlitOp blitOp) {
    blit_if(src, Common::Rect(0, 0, src.w, src.h), dest, destPos, blitOp);
}

}

#endif