cvbspalettedcontroller.h

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/*
  Created by Fabrizio Di Vittorio (fdivitto2013@gmail.com) - <http://www.fabgl.com>
  Copyright (c) 2019-2022 Fabrizio Di Vittorio.
  All rights reserved.
 
 
* Please contact fdivitto2013@gmail.com if you need a commercial license.
 
 
* This library and related software is available under GPL v3.
 
  FabGL 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.
 
  FabGL 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 FabGL.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 
#pragma once
 
 
 
#include <stdint.h>
#include <stddef.h>
#include <atomic>
 
#include "freertos/FreeRTOS.h"
#include "freertos/queue.h"
 
#include "fabglconf.h"
#include "fabutils.h"
#include "displaycontroller.h"
#include "dispdrivers/cvbsbasecontroller.h"
 
 
 
 
namespace fabgl {
 
 
 
 
class CVBSPalettedController : public CVBSBaseController {
 
public:
 
  CVBSPalettedController(int columnsQuantum, NativePixelFormat nativePixelFormat, int viewPortRatioDiv, int viewPortRatioMul);
  ~CVBSPalettedController();
 
  // unwanted methods
  CVBSPalettedController(CVBSPalettedController const&) = delete;
  void operator=(CVBSPalettedController const&)        = delete;
 
  void end();
 
  // abstract method of BitmappedDisplayController
  void suspendBackgroundPrimitiveExecution();
 
  // import "modeline" version of setResolution
  using CVBSBaseController::setResolution;
 
  void setResolution(CVBSParams const * params, int viewPortWidth = -1, int viewPortHeight = -1, bool doubleBuffered = false);
 
  int getPaletteSize();
 
  virtual int colorsCount()      { return getPaletteSize(); }
 
  void setProcessPrimitivesOnBlank(bool value)          { m_processPrimitivesOnBlank = value; }
 
  // returns "static" version of m_viewPort
  static uint8_t * sgetScanline(int y)                  { return (uint8_t*) s_viewPort[y]; }
 
  // abstract method of BitmappedDisplayController
  NativePixelFormat nativePixelFormat()                 { return m_nativePixelFormat; }
 
 
protected:
 
  void init();
 
  virtual void setupDefaultPalette() = 0;
 
  void updateRGB2PaletteLUT();
  void calculateAvailableCyclesForDrawings();
  static void primitiveExecTask(void * arg);
 
  uint8_t RGB888toPaletteIndex(RGB888 const & rgb) {
    return m_packedRGB222_to_PaletteIndex[RGB888toPackedRGB222(rgb)];
  }
 
  uint8_t RGB2222toPaletteIndex(uint8_t value) {
    return m_packedRGB222_to_PaletteIndex[value & 0b00111111];
  }
 
  uint8_t RGB8888toPaletteIndex(RGBA8888 value) {
    return RGB888toPaletteIndex(RGB888(value.R, value.G, value.B));
  }
 
  // abstract method of BitmappedDisplayController
  void swapBuffers();
 
 
  TaskHandle_t                m_primitiveExecTask;
 
  // optimization: clones of m_viewPort and m_viewPortVisible
  static volatile uint8_t * * s_viewPort;
  static volatile uint8_t * * s_viewPortVisible;
 
  RGB222 *                    m_palette;
 
 
protected:
 
  void allocateViewPort();
  void freeViewPort();
  void checkViewPortSize();
 
  // Maximum time (in CPU cycles) available for primitives drawing
  volatile uint32_t           m_primitiveExecTimeoutCycles;
 
  volatile bool               m_taskProcessingPrimitives;
 
  // true = allowed time to process primitives is limited to the vertical blank. Slow, but avoid flickering
  // false = allowed time is the half of an entire frame. Fast, but may flick
  bool                        m_processPrimitivesOnBlank;
 
  uint8_t                     m_packedRGB222_to_PaletteIndex[64];
 
  // configuration
  int                         m_columnsQuantum; // viewport width must be divisble by m_columnsQuantum
  NativePixelFormat           m_nativePixelFormat;
  int                         m_viewPortRatioDiv;
  int                         m_viewPortRatioMul;
 
};
 
 
 
} // end of namespace