libretro-graphics-surface.h

/* Copyright (C) 2024 Giovanni Cascione <ing.cascione@gmail.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 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 BACKENDS_LIBRETRO_GRAPHICS_SURFACE_H
#define BACKENDS_LIBRETRO_GRAPHICS_SURFACE_H

#include "common/system.h"
#include "graphics/palette.h"
#include "graphics/managed_surface.h"
#include "backends/graphics/windowed.h"

class LibretroGraphics : public WindowedGraphicsManager {

public:
    Graphics::ManagedSurface _screen;
    Graphics::Surface _gameScreen;
    Graphics::Surface _overlay;
    Graphics::Surface _cursor;
    Graphics::Palette _cursorPalette;
    Graphics::Palette _gamePalette;

private:
    float _cursorScaleX;
    float _cursorScaleY;
    bool _cursorPaletteEnabled;
    bool _screenUpdatePending;
    int _cursorHotspotX;
    int _cursorHotspotY;
    int _cursorKeyColor;
    int _screenChangeID;
    int _cursorHotspotXScaled;
    int _cursorHotspotYScaled;
    float _cursorWidthScaled;
    float _cursorHeightScaled;

public:
    LibretroGraphics();
    ~LibretroGraphics();
    Common::List<Graphics::PixelFormat> getSupportedFormats() const override;
    const OSystem::GraphicsMode *getSupportedGraphicsModes(void) const override;
    void initSize(uint width, uint height, const Graphics::PixelFormat *format) override;
    int16 getHeight(void) const override;
    int16 getWidth(void) const override;
    Graphics::PixelFormat getScreenFormat(void) const override;
    void copyRectToScreen(const void *buf, int pitch, int x, int y, int w, int h) override;
    void updateScreen(void) override;
    void clearOverlay(void) override;
    void grabOverlay(Graphics::Surface &surface) const override;
    void copyRectToOverlay(const void *buf, int pitch, int x, int y, int w, int h) override;
    int16 getOverlayHeight(void) const override;
    int16 getOverlayWidth(void) const override;
    Graphics::PixelFormat getOverlayFormat() const override;
    const Graphics::ManagedSurface *getScreen(void);
    void warpMouse(int x, int y) override;
    void setMouseCursor(const void *buf, uint w, uint h, int hotspotX, int hotspotY, uint32 keycolor, const Graphics::PixelFormat *format, const byte *mask, frac_t scaleX, frac_t scaleY) override;
    void setCursorPalette(const byte *colors, uint start, uint num) override;
    bool isOverlayInGUI(void);

    bool hasFeature(OSystem::Feature f) const override;
    void setFeatureState(OSystem::Feature f, bool enable) override;
    bool getFeatureState(OSystem::Feature f) const override;

    int getDefaultGraphicsMode() const override {
        return 0;
    }
    bool setGraphicsMode(int mode, uint flags = OSystem::kGfxModeNoFlags) override {
        return true;
    }
    int getGraphicsMode() const override {
        return 0;
    }
    Graphics::Surface *lockScreen() override {
        return &_gameScreen;
    }
    void unlockScreen() override {}

    int getScreenChangeID() const override;
    void beginGFXTransaction() override {}
    OSystem::TransactionError endGFXTransaction() override;
    void fillScreen(uint32 col) override {}
    void fillScreen(const Common::Rect &r, uint32 col) override {}
    void setFocusRectangle(const Common::Rect &rect) override {}
    void clearFocusRectangle() override {}

    void realUpdateScreen(void);

    bool gameNeedsAspectRatioCorrection() const override {
        return false;
    }
    void handleResizeImpl(const int width, const int height) override;
    void setSystemMousePosition(const int x, const int y) override {}
    void setMousePosition(int x, int y);

    void displayMessageOnOSD(const Common::U32String &msg) override;

protected:
    void setPalette(const byte *colors, uint start, uint num) override;
    void grabPalette(byte *colors, uint start, uint num) const override;
private:
    void overrideCursorScaling();
};
#endif //BACKENDS_LIBRETRO_GRAPHICS_SURFACE_H