// WinCanvas.cpp
// this file is part of Context Free
// ---------------------
// Copyright (C) 2005-2013 John Horigan - john@glyphic.com
//
// 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
// 
// John Horigan can be contacted at john@glyphic.com or at
// John Horigan, 1209 Villa St., Mountain View, CA 94041-1123, USA
//
//

#include "WinCanvas.h"
#include "WinSystem.h"

void WinCanvas::start(bool clear, const agg::rgba& bk, int actualWidth, int actualHeight)
{
    aggCanvas::start(clear, bk, actualWidth, actualHeight);
}

void WinCanvas::end()
{
    aggCanvas::end();

    // This message tells the Document view to update the window
    if (!mNoUpdate) mSystem->statusUpdate();
}

WinCanvas::WinCanvas(WinSystem* sys, aggCanvas::PixelFormat pixfmt, 
                     int width, int height, agg::rgba bkgrnd)
:   aggCanvas(pixfmt),
    mPixelFormat(pixfmt),
    mBM(nullptr),
    mBackground(bkgrnd),
    mNoUpdate(true),
    mSystem(sys)
{
    mWidth = width;
    mHeight = abs(height);
    mStride = mWidth * aggCanvas::BytesPerPixel.at(mPixelFormat);

    // pad row stride to DWORD boundary
    mStride += ((-mStride) & 3);

    mBM = std::make_unique<uint32_t[]>(mStride * mHeight / 4);
    aggCanvas::attach((void*)(mBM.get()), mWidth, mHeight, mStride, height > 0);

    // clear the bitmap
    aggCanvas::start(true, bkgrnd, width, mHeight);
    aggCanvas::end();
    mNoUpdate = false;
}

char*
WinCanvas::bitmap()
{
    return (char*)mBM.get();
}

void WinCanvas::Make8bitCopy(wincanvas_ptr& eight)
{
    auto fmt8 = (aggCanvas::PixelFormat)(mPixelFormat & (~aggCanvas::Has_16bit_Color));
    if (!eight || eight->mWidth != mWidth || eight->mHeight != mHeight ||
                  eight->mPixelFormat != fmt8 || eight->mSystem != mSystem)
    {
        eight = std::make_unique<WinCanvas>(mSystem, fmt8, mWidth, mHeight, mBackground);
    } else {
        eight->mBackground = mBackground;
    }

    eight->mNoUpdate = true;
    eight->start(true, mBackground, cropWidth(), cropHeight());
    eight->end();
    eight->mNoUpdate = false;

    eight->copy((void*)(mBM.get()), mWidth, mHeight, mStride, mPixelFormat);
}