gfx_context.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/>.
 *
 * Copyright 2020 Google
 *
 */
#ifndef HADESCH_GFX_CONTEXT_H
#define HADESCH_GFX_CONTEXT_H

#include "common/ptr.h"
#include "common/rect.h"
#include "graphics/managed_surface.h"

namespace Hadesch {
class GfxContext {
public:
    virtual void blitVideo(byte *sourcePixels, int sourcePitch, int sourceW, int sourceH,
                   byte *palette, Common::Point offset) = 0;
    // Use only in pod_image.cpp because of palette format
    virtual void blitPodImage(byte *sourcePixels, int sourcePitch, int sourceW, int sourceH,
                  byte *palette, size_t ncolours, Common::Point offset) = 0;
    virtual void clear() = 0;
    virtual void renderSubtitle(const Common::U32String &, Common::Point viewPoint) = 0;
    virtual void fade(int val) = 0;
    virtual void renderToScreen(Common::Point viewPoint) = 0;
    virtual ~GfxContext() {}
};

class GfxContext8Bit : public GfxContext, Common::NonCopyable {
public:
    void blitVideo(byte *sourcePixels, int sourcePitch, int sourceW, int sourceH,
               byte *palette, Common::Point offset) override;
    void blitPodImage(byte *sourcePixels, int sourcePitch, int sourceW, int sourceH,
              byte *palette, size_t ncolours, Common::Point offset) override;
    void clear() override;
    void fade(int val) override;
    void renderToScreen(Common::Point viewPoint) override;
    void renderSubtitle(const Common::U32String &, Common::Point viewPoint) override;
    byte findColor(byte r, byte g, byte b);

    GfxContext8Bit(int canvasW, int canvasH);
    ~GfxContext8Bit() {}

private:
    Graphics::ManagedSurface surf;
    byte _palette[256 * 4];
    bool _paletteUsed[256];
};

void blendVideo8To8(byte *targetPixels, int targetPitch, int targetW, int targetH,
            byte *sourcePixels, int sourceW, int sourceH, Common::Point offset);

}

#endif