crosspoint-reader-mod/lib/GfxRenderer/GfxRenderer.h

#pragma once

#include <EpdFontFamily.h>
#include <FontDecompressor.h>
#include <HalDisplay.h>

#include <map>

#include "Bitmap.h"

// Color representation: uint8_t mapped to 4x4 Bayer matrix dithering levels
// 0 = transparent, 1-16 = gray levels (white to black)
enum Color : uint8_t { Clear = 0x00, White = 0x01, LightGray = 0x05, DarkGray = 0x0A, Black = 0x10 };

class GfxRenderer {
 public:
  enum RenderMode { BW, GRAYSCALE_LSB, GRAYSCALE_MSB };

  // Logical screen orientation from the perspective of callers
  enum Orientation {
    Portrait,                  // 480x800 logical coordinates (current default)
    LandscapeClockwise,        // 800x480 logical coordinates, rotated 180° (swap top/bottom)
    PortraitInverted,          // 480x800 logical coordinates, inverted
    LandscapeCounterClockwise  // 800x480 logical coordinates, native panel orientation
  };

 private:
  static constexpr size_t BW_BUFFER_CHUNK_SIZE = 8000;  // 8KB chunks to allow for non-contiguous memory
  static constexpr size_t BW_BUFFER_NUM_CHUNKS = HalDisplay::BUFFER_SIZE / BW_BUFFER_CHUNK_SIZE;
  static_assert(BW_BUFFER_CHUNK_SIZE * BW_BUFFER_NUM_CHUNKS == HalDisplay::BUFFER_SIZE,
                "BW buffer chunking does not line up with display buffer size");

  HalDisplay& display;
  RenderMode renderMode;
  Orientation orientation;
  bool fadingFix;
  uint8_t* frameBuffer = nullptr;
  uint8_t* bwBufferChunks[BW_BUFFER_NUM_CHUNKS] = {nullptr};
  std::map<int, EpdFontFamily> fontMap;
  FontDecompressor* fontDecompressor = nullptr;
  void renderChar(const EpdFontFamily& fontFamily, uint32_t cp, int* x, int* y, bool pixelState,
                  EpdFontFamily::Style style) const;
  void freeBwBufferChunks();
  template <Color color>
  void drawPixelDither(int x, int y) const;
  template <Color color>
  void fillArc(int maxRadius, int cx, int cy, int xDir, int yDir) const;

 public:
  explicit GfxRenderer(HalDisplay& halDisplay)
      : display(halDisplay), renderMode(BW), orientation(Portrait), fadingFix(false) {}
  ~GfxRenderer() { freeBwBufferChunks(); }

  static constexpr int VIEWABLE_MARGIN_TOP = 9;
  static constexpr int VIEWABLE_MARGIN_RIGHT = 3;
  static constexpr int VIEWABLE_MARGIN_BOTTOM = 3;
  static constexpr int VIEWABLE_MARGIN_LEFT = 3;

  // Setup
  void begin();  // must be called right after display.begin()
  void insertFont(int fontId, EpdFontFamily font);
  void setFontDecompressor(FontDecompressor* d) { fontDecompressor = d; }
  void clearFontCache() {
    if (fontDecompressor) fontDecompressor->clearCache();
  }

  // Orientation control (affects logical width/height and coordinate transforms)
  void setOrientation(const Orientation o) { orientation = o; }
  Orientation getOrientation() const { return orientation; }

  // Fading fix control
  void setFadingFix(const bool enabled) { fadingFix = enabled; }

  // Screen ops
  int getScreenWidth() const;
  int getScreenHeight() const;
  void displayBuffer(HalDisplay::RefreshMode refreshMode = HalDisplay::FAST_REFRESH) const;
  // EXPERIMENTAL: Windowed update - display only a rectangular region
  // void displayWindow(int x, int y, int width, int height) const;
  void invertScreen() const;
  void clearScreen(uint8_t color = 0xFF) const;
  void getOrientedViewableTRBL(int* outTop, int* outRight, int* outBottom, int* outLeft) const;

  // Drawing
  void drawPixel(int x, int y, bool state = true) const;
  void drawLine(int x1, int y1, int x2, int y2, bool state = true) const;
  void drawLine(int x1, int y1, int x2, int y2, int lineWidth, bool state) const;
  void drawArc(int maxRadius, int cx, int cy, int xDir, int yDir, int lineWidth, bool state) const;
  void drawRect(int x, int y, int width, int height, bool state = true) const;
  void drawRect(int x, int y, int width, int height, int lineWidth, bool state) const;
  void drawRoundedRect(int x, int y, int width, int height, int lineWidth, int cornerRadius, bool state) const;
  void drawRoundedRect(int x, int y, int width, int height, int lineWidth, int cornerRadius, bool roundTopLeft,
                       bool roundTopRight, bool roundBottomLeft, bool roundBottomRight, bool state) const;
  void fillRect(int x, int y, int width, int height, bool state = true) const;
  void fillRectDither(int x, int y, int width, int height, Color color) const;
  void fillRoundedRect(int x, int y, int width, int height, int cornerRadius, Color color) const;
  void fillRoundedRect(int x, int y, int width, int height, int cornerRadius, bool roundTopLeft, bool roundTopRight,
                       bool roundBottomLeft, bool roundBottomRight, Color color) const;
  void drawImage(const uint8_t bitmap[], int x, int y, int width, int height) const;
  void drawIcon(const uint8_t bitmap[], int x, int y, int width, int height) const;
  void drawBitmap(const Bitmap& bitmap, int x, int y, int maxWidth, int maxHeight, float cropX = 0,
                  float cropY = 0) const;
  void drawBitmap1Bit(const Bitmap& bitmap, int x, int y, int maxWidth, int maxHeight) const;
  void fillPolygon(const int* xPoints, const int* yPoints, int numPoints, bool state = true) const;

  // Text
  int getTextWidth(int fontId, const char* text, EpdFontFamily::Style style = EpdFontFamily::REGULAR) const;
  void drawCenteredText(int fontId, int y, const char* text, bool black = true,
                        EpdFontFamily::Style style = EpdFontFamily::REGULAR) const;
  void drawText(int fontId, int x, int y, const char* text, bool black = true,
                EpdFontFamily::Style style = EpdFontFamily::REGULAR) const;
  int getSpaceWidth(int fontId, EpdFontFamily::Style style = EpdFontFamily::REGULAR) const;
  /// Returns the kerning adjustment for a space between two codepoints:
  /// kern(leftCp, ' ') + kern(' ', rightCp). Returns 0 if kerning is unavailable.
  int getSpaceKernAdjust(int fontId, uint32_t leftCp, uint32_t rightCp, EpdFontFamily::Style style) const;
  /// Returns the kerning adjustment between two adjacent codepoints.
  int getKerning(int fontId, uint32_t leftCp, uint32_t rightCp, EpdFontFamily::Style style) const;
  int getTextAdvanceX(int fontId, const char* text, EpdFontFamily::Style style) const;
  int getFontAscenderSize(int fontId) const;
  int getLineHeight(int fontId) const;
  std::string truncatedText(int fontId, const char* text, int maxWidth,
                            EpdFontFamily::Style style = EpdFontFamily::REGULAR) const;

  // Helper for drawing rotated text (90 degrees clockwise, for side buttons)
  void drawTextRotated90CW(int fontId, int x, int y, const char* text, bool black = true,
                           EpdFontFamily::Style style = EpdFontFamily::REGULAR) const;
  int getTextHeight(int fontId) const;

  // Grayscale functions
  void setRenderMode(const RenderMode mode) { this->renderMode = mode; }
  RenderMode getRenderMode() const { return renderMode; }
  void copyGrayscaleLsbBuffers() const;
  void copyGrayscaleMsbBuffers() const;
  void displayGrayBuffer() const;
  bool storeBwBuffer();    // Returns true if buffer was stored successfully
  void restoreBwBuffer();  // Restore and free the stored buffer
  void cleanupGrayscaleWithFrameBuffer() const;

  // Font helpers
  const uint8_t* getGlyphBitmap(const EpdFontData* fontData, const EpdGlyph* glyph) const;

  // Low level functions
  uint8_t* getFrameBuffer() const;
  static size_t getBufferSize();
};